[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/Kconfig b/ap/os/linux/linux-3.4.x/drivers/hv/Kconfig
new file mode 100644
index 0000000..70f5dde
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/Kconfig
@@ -0,0 +1,16 @@
+menu "Microsoft Hyper-V guest support"
+
+config HYPERV
+ tristate "Microsoft Hyper-V client drivers"
+ depends on X86 && ACPI && PCI
+ help
+ Select this option to run Linux as a Hyper-V client operating
+ system.
+
+config HYPERV_UTILS
+ tristate "Microsoft Hyper-V Utilities driver"
+ depends on HYPERV && CONNECTOR && NLS
+ help
+ Select this option to enable the Hyper-V Utilities.
+
+endmenu
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/Makefile b/ap/os/linux/linux-3.4.x/drivers/hv/Makefile
new file mode 100644
index 0000000..a23938b
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/Makefile
@@ -0,0 +1,7 @@
+obj-$(CONFIG_HYPERV) += hv_vmbus.o
+obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o
+
+hv_vmbus-y := vmbus_drv.o \
+ hv.o connection.o channel.o \
+ channel_mgmt.o ring_buffer.o
+hv_utils-y := hv_util.o hv_kvp.o
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/channel.c b/ap/os/linux/linux-3.4.x/drivers/hv/channel.c
new file mode 100644
index 0000000..980ef7e
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/channel.c
@@ -0,0 +1,835 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/hyperv.h>
+
+#include "hyperv_vmbus.h"
+
+#define NUM_PAGES_SPANNED(addr, len) \
+((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT))
+
+/* Internal routines */
+static int create_gpadl_header(
+ void *kbuffer, /* must be phys and virt contiguous */
+ u32 size, /* page-size multiple */
+ struct vmbus_channel_msginfo **msginfo,
+ u32 *messagecount);
+static void vmbus_setevent(struct vmbus_channel *channel);
+
+/*
+ * vmbus_setevent- Trigger an event notification on the specified
+ * channel.
+ */
+static void vmbus_setevent(struct vmbus_channel *channel)
+{
+ struct hv_monitor_page *monitorpage;
+
+ if (channel->offermsg.monitor_allocated) {
+ /* Each u32 represents 32 channels */
+ sync_set_bit(channel->offermsg.child_relid & 31,
+ (unsigned long *) vmbus_connection.send_int_page +
+ (channel->offermsg.child_relid >> 5));
+
+ monitorpage = vmbus_connection.monitor_pages;
+ monitorpage++; /* Get the child to parent monitor page */
+
+ sync_set_bit(channel->monitor_bit,
+ (unsigned long *)&monitorpage->trigger_group
+ [channel->monitor_grp].pending);
+
+ } else {
+ vmbus_set_event(channel->offermsg.child_relid);
+ }
+}
+
+/*
+ * vmbus_get_debug_info -Retrieve various channel debug info
+ */
+void vmbus_get_debug_info(struct vmbus_channel *channel,
+ struct vmbus_channel_debug_info *debuginfo)
+{
+ struct hv_monitor_page *monitorpage;
+ u8 monitor_group = (u8)channel->offermsg.monitorid / 32;
+ u8 monitor_offset = (u8)channel->offermsg.monitorid % 32;
+
+ debuginfo->relid = channel->offermsg.child_relid;
+ debuginfo->state = channel->state;
+ memcpy(&debuginfo->interfacetype,
+ &channel->offermsg.offer.if_type, sizeof(uuid_le));
+ memcpy(&debuginfo->interface_instance,
+ &channel->offermsg.offer.if_instance,
+ sizeof(uuid_le));
+
+ monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages;
+
+ debuginfo->monitorid = channel->offermsg.monitorid;
+
+ debuginfo->servermonitor_pending =
+ monitorpage->trigger_group[monitor_group].pending;
+ debuginfo->servermonitor_latency =
+ monitorpage->latency[monitor_group][monitor_offset];
+ debuginfo->servermonitor_connectionid =
+ monitorpage->parameter[monitor_group]
+ [monitor_offset].connectionid.u.id;
+
+ monitorpage++;
+
+ debuginfo->clientmonitor_pending =
+ monitorpage->trigger_group[monitor_group].pending;
+ debuginfo->clientmonitor_latency =
+ monitorpage->latency[monitor_group][monitor_offset];
+ debuginfo->clientmonitor_connectionid =
+ monitorpage->parameter[monitor_group]
+ [monitor_offset].connectionid.u.id;
+
+ hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound);
+ hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound);
+}
+
+/*
+ * vmbus_open - Open the specified channel.
+ */
+int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
+ u32 recv_ringbuffer_size, void *userdata, u32 userdatalen,
+ void (*onchannelcallback)(void *context), void *context)
+{
+ struct vmbus_channel_open_channel *open_msg;
+ struct vmbus_channel_msginfo *open_info = NULL;
+ void *in, *out;
+ unsigned long flags;
+ int ret, t, err = 0;
+
+ newchannel->onchannel_callback = onchannelcallback;
+ newchannel->channel_callback_context = context;
+
+ /* Allocate the ring buffer */
+ out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
+ get_order(send_ringbuffer_size + recv_ringbuffer_size));
+
+ if (!out)
+ return -ENOMEM;
+
+
+ in = (void *)((unsigned long)out + send_ringbuffer_size);
+
+ newchannel->ringbuffer_pages = out;
+ newchannel->ringbuffer_pagecount = (send_ringbuffer_size +
+ recv_ringbuffer_size) >> PAGE_SHIFT;
+
+ ret = hv_ringbuffer_init(
+ &newchannel->outbound, out, send_ringbuffer_size);
+
+ if (ret != 0) {
+ err = ret;
+ goto error0;
+ }
+
+ ret = hv_ringbuffer_init(
+ &newchannel->inbound, in, recv_ringbuffer_size);
+ if (ret != 0) {
+ err = ret;
+ goto error0;
+ }
+
+
+ /* Establish the gpadl for the ring buffer */
+ newchannel->ringbuffer_gpadlhandle = 0;
+
+ ret = vmbus_establish_gpadl(newchannel,
+ newchannel->outbound.ring_buffer,
+ send_ringbuffer_size +
+ recv_ringbuffer_size,
+ &newchannel->ringbuffer_gpadlhandle);
+
+ if (ret != 0) {
+ err = ret;
+ goto error0;
+ }
+
+ /* Create and init the channel open message */
+ open_info = kmalloc(sizeof(*open_info) +
+ sizeof(struct vmbus_channel_open_channel),
+ GFP_KERNEL);
+ if (!open_info) {
+ err = -ENOMEM;
+ goto error_gpadl;
+ }
+
+ init_completion(&open_info->waitevent);
+
+ open_msg = (struct vmbus_channel_open_channel *)open_info->msg;
+ open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL;
+ open_msg->openid = newchannel->offermsg.child_relid;
+ open_msg->child_relid = newchannel->offermsg.child_relid;
+ open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle;
+ open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >>
+ PAGE_SHIFT;
+ open_msg->server_contextarea_gpadlhandle = 0;
+
+ if (userdatalen > MAX_USER_DEFINED_BYTES) {
+ err = -EINVAL;
+ goto error_gpadl;
+ }
+
+ if (userdatalen)
+ memcpy(open_msg->userdata, userdata, userdatalen);
+
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_add_tail(&open_info->msglistentry,
+ &vmbus_connection.chn_msg_list);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+
+ ret = vmbus_post_msg(open_msg,
+ sizeof(struct vmbus_channel_open_channel));
+
+ if (ret != 0) {
+ err = ret;
+ goto error1;
+ }
+
+ t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ);
+ if (t == 0) {
+ err = -ETIMEDOUT;
+ goto error1;
+ }
+
+
+ if (open_info->response.open_result.status)
+ err = open_info->response.open_result.status;
+
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_del(&open_info->msglistentry);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+
+ kfree(open_info);
+ return err;
+
+error1:
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_del(&open_info->msglistentry);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+
+error_gpadl:
+ vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle);
+
+error0:
+ free_pages((unsigned long)out,
+ get_order(send_ringbuffer_size + recv_ringbuffer_size));
+ kfree(open_info);
+ return err;
+}
+EXPORT_SYMBOL_GPL(vmbus_open);
+
+/*
+ * create_gpadl_header - Creates a gpadl for the specified buffer
+ */
+static int create_gpadl_header(void *kbuffer, u32 size,
+ struct vmbus_channel_msginfo **msginfo,
+ u32 *messagecount)
+{
+ int i;
+ int pagecount;
+ unsigned long long pfn;
+ struct vmbus_channel_gpadl_header *gpadl_header;
+ struct vmbus_channel_gpadl_body *gpadl_body;
+ struct vmbus_channel_msginfo *msgheader;
+ struct vmbus_channel_msginfo *msgbody = NULL;
+ u32 msgsize;
+
+ int pfnsum, pfncount, pfnleft, pfncurr, pfnsize;
+
+ pagecount = size >> PAGE_SHIFT;
+ pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT;
+
+ /* do we need a gpadl body msg */
+ pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
+ sizeof(struct vmbus_channel_gpadl_header) -
+ sizeof(struct gpa_range);
+ pfncount = pfnsize / sizeof(u64);
+
+ if (pagecount > pfncount) {
+ /* we need a gpadl body */
+ /* fill in the header */
+ msgsize = sizeof(struct vmbus_channel_msginfo) +
+ sizeof(struct vmbus_channel_gpadl_header) +
+ sizeof(struct gpa_range) + pfncount * sizeof(u64);
+ msgheader = kzalloc(msgsize, GFP_KERNEL);
+ if (!msgheader)
+ goto nomem;
+
+ INIT_LIST_HEAD(&msgheader->submsglist);
+ msgheader->msgsize = msgsize;
+
+ gpadl_header = (struct vmbus_channel_gpadl_header *)
+ msgheader->msg;
+ gpadl_header->rangecount = 1;
+ gpadl_header->range_buflen = sizeof(struct gpa_range) +
+ pagecount * sizeof(u64);
+ gpadl_header->range[0].byte_offset = 0;
+ gpadl_header->range[0].byte_count = size;
+ for (i = 0; i < pfncount; i++)
+ gpadl_header->range[0].pfn_array[i] = pfn+i;
+ *msginfo = msgheader;
+ *messagecount = 1;
+
+ pfnsum = pfncount;
+ pfnleft = pagecount - pfncount;
+
+ /* how many pfns can we fit */
+ pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
+ sizeof(struct vmbus_channel_gpadl_body);
+ pfncount = pfnsize / sizeof(u64);
+
+ /* fill in the body */
+ while (pfnleft) {
+ if (pfnleft > pfncount)
+ pfncurr = pfncount;
+ else
+ pfncurr = pfnleft;
+
+ msgsize = sizeof(struct vmbus_channel_msginfo) +
+ sizeof(struct vmbus_channel_gpadl_body) +
+ pfncurr * sizeof(u64);
+ msgbody = kzalloc(msgsize, GFP_KERNEL);
+
+ if (!msgbody) {
+ struct vmbus_channel_msginfo *pos = NULL;
+ struct vmbus_channel_msginfo *tmp = NULL;
+ /*
+ * Free up all the allocated messages.
+ */
+ list_for_each_entry_safe(pos, tmp,
+ &msgheader->submsglist,
+ msglistentry) {
+
+ list_del(&pos->msglistentry);
+ kfree(pos);
+ }
+
+ goto nomem;
+ }
+
+ msgbody->msgsize = msgsize;
+ (*messagecount)++;
+ gpadl_body =
+ (struct vmbus_channel_gpadl_body *)msgbody->msg;
+
+ /*
+ * Gpadl is u32 and we are using a pointer which could
+ * be 64-bit
+ * This is governed by the guest/host protocol and
+ * so the hypervisor gurantees that this is ok.
+ */
+ for (i = 0; i < pfncurr; i++)
+ gpadl_body->pfn[i] = pfn + pfnsum + i;
+
+ /* add to msg header */
+ list_add_tail(&msgbody->msglistentry,
+ &msgheader->submsglist);
+ pfnsum += pfncurr;
+ pfnleft -= pfncurr;
+ }
+ } else {
+ /* everything fits in a header */
+ msgsize = sizeof(struct vmbus_channel_msginfo) +
+ sizeof(struct vmbus_channel_gpadl_header) +
+ sizeof(struct gpa_range) + pagecount * sizeof(u64);
+ msgheader = kzalloc(msgsize, GFP_KERNEL);
+ if (msgheader == NULL)
+ goto nomem;
+ msgheader->msgsize = msgsize;
+
+ gpadl_header = (struct vmbus_channel_gpadl_header *)
+ msgheader->msg;
+ gpadl_header->rangecount = 1;
+ gpadl_header->range_buflen = sizeof(struct gpa_range) +
+ pagecount * sizeof(u64);
+ gpadl_header->range[0].byte_offset = 0;
+ gpadl_header->range[0].byte_count = size;
+ for (i = 0; i < pagecount; i++)
+ gpadl_header->range[0].pfn_array[i] = pfn+i;
+
+ *msginfo = msgheader;
+ *messagecount = 1;
+ }
+
+ return 0;
+nomem:
+ kfree(msgheader);
+ kfree(msgbody);
+ return -ENOMEM;
+}
+
+/*
+ * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer
+ *
+ * @channel: a channel
+ * @kbuffer: from kmalloc
+ * @size: page-size multiple
+ * @gpadl_handle: some funky thing
+ */
+int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
+ u32 size, u32 *gpadl_handle)
+{
+ struct vmbus_channel_gpadl_header *gpadlmsg;
+ struct vmbus_channel_gpadl_body *gpadl_body;
+ struct vmbus_channel_msginfo *msginfo = NULL;
+ struct vmbus_channel_msginfo *submsginfo;
+ u32 msgcount;
+ struct list_head *curr;
+ u32 next_gpadl_handle;
+ unsigned long flags;
+ int ret = 0;
+
+ next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle);
+ atomic_inc(&vmbus_connection.next_gpadl_handle);
+
+ ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount);
+ if (ret)
+ return ret;
+
+ init_completion(&msginfo->waitevent);
+
+ gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg;
+ gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER;
+ gpadlmsg->child_relid = channel->offermsg.child_relid;
+ gpadlmsg->gpadl = next_gpadl_handle;
+
+
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_add_tail(&msginfo->msglistentry,
+ &vmbus_connection.chn_msg_list);
+
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+
+ ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize -
+ sizeof(*msginfo));
+ if (ret != 0)
+ goto cleanup;
+
+ if (msgcount > 1) {
+ list_for_each(curr, &msginfo->submsglist) {
+
+ submsginfo = (struct vmbus_channel_msginfo *)curr;
+ gpadl_body =
+ (struct vmbus_channel_gpadl_body *)submsginfo->msg;
+
+ gpadl_body->header.msgtype =
+ CHANNELMSG_GPADL_BODY;
+ gpadl_body->gpadl = next_gpadl_handle;
+
+ ret = vmbus_post_msg(gpadl_body,
+ submsginfo->msgsize -
+ sizeof(*submsginfo));
+ if (ret != 0)
+ goto cleanup;
+
+ }
+ }
+ wait_for_completion(&msginfo->waitevent);
+
+ /* At this point, we received the gpadl created msg */
+ *gpadl_handle = gpadlmsg->gpadl;
+
+cleanup:
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_del(&msginfo->msglistentry);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+
+ kfree(msginfo);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vmbus_establish_gpadl);
+
+/*
+ * vmbus_teardown_gpadl -Teardown the specified GPADL handle
+ */
+int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
+{
+ struct vmbus_channel_gpadl_teardown *msg;
+ struct vmbus_channel_msginfo *info;
+ unsigned long flags;
+ int ret;
+
+ info = kmalloc(sizeof(*info) +
+ sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ init_completion(&info->waitevent);
+
+ msg = (struct vmbus_channel_gpadl_teardown *)info->msg;
+
+ msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN;
+ msg->child_relid = channel->offermsg.child_relid;
+ msg->gpadl = gpadl_handle;
+
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_add_tail(&info->msglistentry,
+ &vmbus_connection.chn_msg_list);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+ ret = vmbus_post_msg(msg,
+ sizeof(struct vmbus_channel_gpadl_teardown));
+
+ if (ret)
+ goto post_msg_err;
+
+ wait_for_completion(&info->waitevent);
+
+post_msg_err:
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_del(&info->msglistentry);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+
+ kfree(info);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
+
+/*
+ * vmbus_close - Close the specified channel
+ */
+void vmbus_close(struct vmbus_channel *channel)
+{
+ struct vmbus_channel_close_channel *msg;
+ int ret;
+ unsigned long flags;
+
+ /* Stop callback and cancel the timer asap */
+ spin_lock_irqsave(&channel->inbound_lock, flags);
+ channel->onchannel_callback = NULL;
+ spin_unlock_irqrestore(&channel->inbound_lock, flags);
+
+ /* Send a closing message */
+
+ msg = &channel->close_msg.msg;
+
+ msg->header.msgtype = CHANNELMSG_CLOSECHANNEL;
+ msg->child_relid = channel->offermsg.child_relid;
+
+ ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel));
+
+ if (ret) {
+ pr_err("Close failed: close post msg return is %d\n", ret);
+ /*
+ * If we failed to post the close msg,
+ * it is perhaps better to leak memory.
+ */
+ return;
+ }
+
+ /* Tear down the gpadl for the channel's ring buffer */
+ if (channel->ringbuffer_gpadlhandle) {
+ ret = vmbus_teardown_gpadl(channel,
+ channel->ringbuffer_gpadlhandle);
+ if (ret) {
+ pr_err("Close failed: teardown gpadl return %d\n", ret);
+ /*
+ * If we failed to teardown gpadl,
+ * it is perhaps better to leak memory.
+ */
+ return;
+ }
+ }
+
+ /* Cleanup the ring buffers for this channel */
+ hv_ringbuffer_cleanup(&channel->outbound);
+ hv_ringbuffer_cleanup(&channel->inbound);
+
+ free_pages((unsigned long)channel->ringbuffer_pages,
+ get_order(channel->ringbuffer_pagecount * PAGE_SIZE));
+}
+EXPORT_SYMBOL_GPL(vmbus_close);
+
+/**
+ * vmbus_sendpacket() - Send the specified buffer on the given channel
+ * @channel: Pointer to vmbus_channel structure.
+ * @buffer: Pointer to the buffer you want to receive the data into.
+ * @bufferlen: Maximum size of what the the buffer will hold
+ * @requestid: Identifier of the request
+ * @type: Type of packet that is being send e.g. negotiate, time
+ * packet etc.
+ *
+ * Sends data in @buffer directly to hyper-v via the vmbus
+ * This will send the data unparsed to hyper-v.
+ *
+ * Mainly used by Hyper-V drivers.
+ */
+int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer,
+ u32 bufferlen, u64 requestid,
+ enum vmbus_packet_type type, u32 flags)
+{
+ struct vmpacket_descriptor desc;
+ u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen;
+ u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
+ struct scatterlist bufferlist[3];
+ u64 aligned_data = 0;
+ int ret;
+
+
+ /* Setup the descriptor */
+ desc.type = type; /* VmbusPacketTypeDataInBand; */
+ desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
+ /* in 8-bytes granularity */
+ desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3;
+ desc.len8 = (u16)(packetlen_aligned >> 3);
+ desc.trans_id = requestid;
+
+ sg_init_table(bufferlist, 3);
+ sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor));
+ sg_set_buf(&bufferlist[1], buffer, bufferlen);
+ sg_set_buf(&bufferlist[2], &aligned_data,
+ packetlen_aligned - packetlen);
+
+ ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
+
+ if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
+ vmbus_setevent(channel);
+
+ return ret;
+}
+EXPORT_SYMBOL(vmbus_sendpacket);
+
+/*
+ * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
+ * packets using a GPADL Direct packet type.
+ */
+int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
+ struct hv_page_buffer pagebuffers[],
+ u32 pagecount, void *buffer, u32 bufferlen,
+ u64 requestid)
+{
+ int ret;
+ int i;
+ struct vmbus_channel_packet_page_buffer desc;
+ u32 descsize;
+ u32 packetlen;
+ u32 packetlen_aligned;
+ struct scatterlist bufferlist[3];
+ u64 aligned_data = 0;
+
+ if (pagecount > MAX_PAGE_BUFFER_COUNT)
+ return -EINVAL;
+
+
+ /*
+ * Adjust the size down since vmbus_channel_packet_page_buffer is the
+ * largest size we support
+ */
+ descsize = sizeof(struct vmbus_channel_packet_page_buffer) -
+ ((MAX_PAGE_BUFFER_COUNT - pagecount) *
+ sizeof(struct hv_page_buffer));
+ packetlen = descsize + bufferlen;
+ packetlen_aligned = ALIGN(packetlen, sizeof(u64));
+
+ /* Setup the descriptor */
+ desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
+ desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
+ desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
+ desc.length8 = (u16)(packetlen_aligned >> 3);
+ desc.transactionid = requestid;
+ desc.rangecount = pagecount;
+
+ for (i = 0; i < pagecount; i++) {
+ desc.range[i].len = pagebuffers[i].len;
+ desc.range[i].offset = pagebuffers[i].offset;
+ desc.range[i].pfn = pagebuffers[i].pfn;
+ }
+
+ sg_init_table(bufferlist, 3);
+ sg_set_buf(&bufferlist[0], &desc, descsize);
+ sg_set_buf(&bufferlist[1], buffer, bufferlen);
+ sg_set_buf(&bufferlist[2], &aligned_data,
+ packetlen_aligned - packetlen);
+
+ ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
+
+ if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
+ vmbus_setevent(channel);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
+
+/*
+ * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
+ * using a GPADL Direct packet type.
+ */
+int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
+ struct hv_multipage_buffer *multi_pagebuffer,
+ void *buffer, u32 bufferlen, u64 requestid)
+{
+ int ret;
+ struct vmbus_channel_packet_multipage_buffer desc;
+ u32 descsize;
+ u32 packetlen;
+ u32 packetlen_aligned;
+ struct scatterlist bufferlist[3];
+ u64 aligned_data = 0;
+ u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset,
+ multi_pagebuffer->len);
+
+
+ if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT))
+ return -EINVAL;
+
+ /*
+ * Adjust the size down since vmbus_channel_packet_multipage_buffer is
+ * the largest size we support
+ */
+ descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) -
+ ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) *
+ sizeof(u64));
+ packetlen = descsize + bufferlen;
+ packetlen_aligned = ALIGN(packetlen, sizeof(u64));
+
+
+ /* Setup the descriptor */
+ desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
+ desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
+ desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
+ desc.length8 = (u16)(packetlen_aligned >> 3);
+ desc.transactionid = requestid;
+ desc.rangecount = 1;
+
+ desc.range.len = multi_pagebuffer->len;
+ desc.range.offset = multi_pagebuffer->offset;
+
+ memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array,
+ pfncount * sizeof(u64));
+
+ sg_init_table(bufferlist, 3);
+ sg_set_buf(&bufferlist[0], &desc, descsize);
+ sg_set_buf(&bufferlist[1], buffer, bufferlen);
+ sg_set_buf(&bufferlist[2], &aligned_data,
+ packetlen_aligned - packetlen);
+
+ ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
+
+ if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
+ vmbus_setevent(channel);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer);
+
+/**
+ * vmbus_recvpacket() - Retrieve the user packet on the specified channel
+ * @channel: Pointer to vmbus_channel structure.
+ * @buffer: Pointer to the buffer you want to receive the data into.
+ * @bufferlen: Maximum size of what the the buffer will hold
+ * @buffer_actual_len: The actual size of the data after it was received
+ * @requestid: Identifier of the request
+ *
+ * Receives directly from the hyper-v vmbus and puts the data it received
+ * into Buffer. This will receive the data unparsed from hyper-v.
+ *
+ * Mainly used by Hyper-V drivers.
+ */
+int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
+ u32 bufferlen, u32 *buffer_actual_len, u64 *requestid)
+{
+ struct vmpacket_descriptor desc;
+ u32 packetlen;
+ u32 userlen;
+ int ret;
+
+ *buffer_actual_len = 0;
+ *requestid = 0;
+
+
+ ret = hv_ringbuffer_peek(&channel->inbound, &desc,
+ sizeof(struct vmpacket_descriptor));
+ if (ret != 0)
+ return 0;
+
+ packetlen = desc.len8 << 3;
+ userlen = packetlen - (desc.offset8 << 3);
+
+ *buffer_actual_len = userlen;
+
+ if (userlen > bufferlen) {
+
+ pr_err("Buffer too small - got %d needs %d\n",
+ bufferlen, userlen);
+ return -ETOOSMALL;
+ }
+
+ *requestid = desc.trans_id;
+
+ /* Copy over the packet to the user buffer */
+ ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen,
+ (desc.offset8 << 3));
+
+
+ return 0;
+}
+EXPORT_SYMBOL(vmbus_recvpacket);
+
+/*
+ * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel
+ */
+int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
+ u32 bufferlen, u32 *buffer_actual_len,
+ u64 *requestid)
+{
+ struct vmpacket_descriptor desc;
+ u32 packetlen;
+ u32 userlen;
+ int ret;
+
+ *buffer_actual_len = 0;
+ *requestid = 0;
+
+
+ ret = hv_ringbuffer_peek(&channel->inbound, &desc,
+ sizeof(struct vmpacket_descriptor));
+ if (ret != 0)
+ return 0;
+
+
+ packetlen = desc.len8 << 3;
+ userlen = packetlen - (desc.offset8 << 3);
+
+ *buffer_actual_len = packetlen;
+
+ if (packetlen > bufferlen) {
+ pr_err("Buffer too small - needed %d bytes but "
+ "got space for only %d bytes\n",
+ packetlen, bufferlen);
+ return -ENOBUFS;
+ }
+
+ *requestid = desc.trans_id;
+
+ /* Copy over the entire packet to the user buffer */
+ ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/channel_mgmt.c b/ap/os/linux/linux-3.4.x/drivers/hv/channel_mgmt.c
new file mode 100644
index 0000000..bcf67af
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/channel_mgmt.c
@@ -0,0 +1,561 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <linux/hyperv.h>
+
+#include "hyperv_vmbus.h"
+
+struct vmbus_channel_message_table_entry {
+ enum vmbus_channel_message_type message_type;
+ void (*message_handler)(struct vmbus_channel_message_header *msg);
+};
+
+
+/**
+ * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
+ * @icmsghdrp: Pointer to msg header structure
+ * @icmsg_negotiate: Pointer to negotiate message structure
+ * @buf: Raw buffer channel data
+ *
+ * @icmsghdrp is of type &struct icmsg_hdr.
+ * @negop is of type &struct icmsg_negotiate.
+ * Set up and fill in default negotiate response message. This response can
+ * come from both the vmbus driver and the hv_utils driver. The current api
+ * will respond properly to both Windows 2008 and Windows 2008-R2 operating
+ * systems.
+ *
+ * Mainly used by Hyper-V drivers.
+ */
+void vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
+ struct icmsg_negotiate *negop, u8 *buf)
+{
+ if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+ icmsghdrp->icmsgsize = 0x10;
+
+ negop = (struct icmsg_negotiate *)&buf[
+ sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+
+ if (negop->icframe_vercnt == 2 &&
+ negop->icversion_data[1].major == 3) {
+ negop->icversion_data[0].major = 3;
+ negop->icversion_data[0].minor = 0;
+ negop->icversion_data[1].major = 3;
+ negop->icversion_data[1].minor = 0;
+ } else {
+ negop->icversion_data[0].major = 1;
+ negop->icversion_data[0].minor = 0;
+ negop->icversion_data[1].major = 1;
+ negop->icversion_data[1].minor = 0;
+ }
+
+ negop->icframe_vercnt = 1;
+ negop->icmsg_vercnt = 1;
+ }
+}
+EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp);
+
+/*
+ * alloc_channel - Allocate and initialize a vmbus channel object
+ */
+static struct vmbus_channel *alloc_channel(void)
+{
+ struct vmbus_channel *channel;
+
+ channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
+ if (!channel)
+ return NULL;
+
+ spin_lock_init(&channel->inbound_lock);
+
+ channel->controlwq = create_workqueue("hv_vmbus_ctl");
+ if (!channel->controlwq) {
+ kfree(channel);
+ return NULL;
+ }
+
+ return channel;
+}
+
+/*
+ * release_hannel - Release the vmbus channel object itself
+ */
+static void release_channel(struct work_struct *work)
+{
+ struct vmbus_channel *channel = container_of(work,
+ struct vmbus_channel,
+ work);
+
+ destroy_workqueue(channel->controlwq);
+
+ kfree(channel);
+}
+
+/*
+ * free_channel - Release the resources used by the vmbus channel object
+ */
+static void free_channel(struct vmbus_channel *channel)
+{
+
+ /*
+ * We have to release the channel's workqueue/thread in the vmbus's
+ * workqueue/thread context
+ * ie we can't destroy ourselves.
+ */
+ INIT_WORK(&channel->work, release_channel);
+ queue_work(vmbus_connection.work_queue, &channel->work);
+}
+
+
+
+/*
+ * vmbus_process_rescind_offer -
+ * Rescind the offer by initiating a device removal
+ */
+static void vmbus_process_rescind_offer(struct work_struct *work)
+{
+ struct vmbus_channel *channel = container_of(work,
+ struct vmbus_channel,
+ work);
+
+ vmbus_device_unregister(channel->device_obj);
+}
+
+void vmbus_free_channels(void)
+{
+ struct vmbus_channel *channel;
+
+ list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
+ vmbus_device_unregister(channel->device_obj);
+ kfree(channel->device_obj);
+ free_channel(channel);
+ }
+}
+
+/*
+ * vmbus_process_offer - Process the offer by creating a channel/device
+ * associated with this offer
+ */
+static void vmbus_process_offer(struct work_struct *work)
+{
+ struct vmbus_channel *newchannel = container_of(work,
+ struct vmbus_channel,
+ work);
+ struct vmbus_channel *channel;
+ bool fnew = true;
+ int ret;
+ unsigned long flags;
+
+ /* The next possible work is rescind handling */
+ INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
+
+ /* Make sure this is a new offer */
+ spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
+
+ list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
+ if (!uuid_le_cmp(channel->offermsg.offer.if_type,
+ newchannel->offermsg.offer.if_type) &&
+ !uuid_le_cmp(channel->offermsg.offer.if_instance,
+ newchannel->offermsg.offer.if_instance)) {
+ fnew = false;
+ break;
+ }
+ }
+
+ if (fnew)
+ list_add_tail(&newchannel->listentry,
+ &vmbus_connection.chn_list);
+
+ spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
+
+ if (!fnew) {
+ free_channel(newchannel);
+ return;
+ }
+
+ /*
+ * Start the process of binding this offer to the driver
+ * We need to set the DeviceObject field before calling
+ * vmbus_child_dev_add()
+ */
+ newchannel->device_obj = vmbus_device_create(
+ &newchannel->offermsg.offer.if_type,
+ &newchannel->offermsg.offer.if_instance,
+ newchannel);
+
+ /*
+ * Add the new device to the bus. This will kick off device-driver
+ * binding which eventually invokes the device driver's AddDevice()
+ * method.
+ */
+ ret = vmbus_device_register(newchannel->device_obj);
+ if (ret != 0) {
+ pr_err("unable to add child device object (relid %d)\n",
+ newchannel->offermsg.child_relid);
+
+ spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
+ list_del(&newchannel->listentry);
+ spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
+ kfree(newchannel->device_obj);
+
+ free_channel(newchannel);
+ } else {
+ /*
+ * This state is used to indicate a successful open
+ * so that when we do close the channel normally, we
+ * can cleanup properly
+ */
+ newchannel->state = CHANNEL_OPEN_STATE;
+ }
+}
+
+/*
+ * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
+ *
+ */
+static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
+{
+ struct vmbus_channel_offer_channel *offer;
+ struct vmbus_channel *newchannel;
+ uuid_le *guidtype;
+ uuid_le *guidinstance;
+
+ offer = (struct vmbus_channel_offer_channel *)hdr;
+
+ guidtype = &offer->offer.if_type;
+ guidinstance = &offer->offer.if_instance;
+
+ /* Allocate the channel object and save this offer. */
+ newchannel = alloc_channel();
+ if (!newchannel) {
+ pr_err("Unable to allocate channel object\n");
+ return;
+ }
+
+ memcpy(&newchannel->offermsg, offer,
+ sizeof(struct vmbus_channel_offer_channel));
+ newchannel->monitor_grp = (u8)offer->monitorid / 32;
+ newchannel->monitor_bit = (u8)offer->monitorid % 32;
+
+ INIT_WORK(&newchannel->work, vmbus_process_offer);
+ queue_work(newchannel->controlwq, &newchannel->work);
+}
+
+/*
+ * vmbus_onoffer_rescind - Rescind offer handler.
+ *
+ * We queue a work item to process this offer synchronously
+ */
+static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
+{
+ struct vmbus_channel_rescind_offer *rescind;
+ struct vmbus_channel *channel;
+
+ rescind = (struct vmbus_channel_rescind_offer *)hdr;
+ channel = relid2channel(rescind->child_relid);
+
+ if (channel == NULL)
+ /* Just return here, no channel found */
+ return;
+
+ /* work is initialized for vmbus_process_rescind_offer() from
+ * vmbus_process_offer() where the channel got created */
+ queue_work(channel->controlwq, &channel->work);
+}
+
+/*
+ * vmbus_onoffers_delivered -
+ * This is invoked when all offers have been delivered.
+ *
+ * Nothing to do here.
+ */
+static void vmbus_onoffers_delivered(
+ struct vmbus_channel_message_header *hdr)
+{
+}
+
+/*
+ * vmbus_onopen_result - Open result handler.
+ *
+ * This is invoked when we received a response to our channel open request.
+ * Find the matching request, copy the response and signal the requesting
+ * thread.
+ */
+static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
+{
+ struct vmbus_channel_open_result *result;
+ struct vmbus_channel_msginfo *msginfo;
+ struct vmbus_channel_message_header *requestheader;
+ struct vmbus_channel_open_channel *openmsg;
+ unsigned long flags;
+
+ result = (struct vmbus_channel_open_result *)hdr;
+
+ /*
+ * Find the open msg, copy the result and signal/unblock the wait event
+ */
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+
+ list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
+ msglistentry) {
+ requestheader =
+ (struct vmbus_channel_message_header *)msginfo->msg;
+
+ if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
+ openmsg =
+ (struct vmbus_channel_open_channel *)msginfo->msg;
+ if (openmsg->child_relid == result->child_relid &&
+ openmsg->openid == result->openid) {
+ memcpy(&msginfo->response.open_result,
+ result,
+ sizeof(
+ struct vmbus_channel_open_result));
+ complete(&msginfo->waitevent);
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+}
+
+/*
+ * vmbus_ongpadl_created - GPADL created handler.
+ *
+ * This is invoked when we received a response to our gpadl create request.
+ * Find the matching request, copy the response and signal the requesting
+ * thread.
+ */
+static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
+{
+ struct vmbus_channel_gpadl_created *gpadlcreated;
+ struct vmbus_channel_msginfo *msginfo;
+ struct vmbus_channel_message_header *requestheader;
+ struct vmbus_channel_gpadl_header *gpadlheader;
+ unsigned long flags;
+
+ gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
+
+ /*
+ * Find the establish msg, copy the result and signal/unblock the wait
+ * event
+ */
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+
+ list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
+ msglistentry) {
+ requestheader =
+ (struct vmbus_channel_message_header *)msginfo->msg;
+
+ if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
+ gpadlheader =
+ (struct vmbus_channel_gpadl_header *)requestheader;
+
+ if ((gpadlcreated->child_relid ==
+ gpadlheader->child_relid) &&
+ (gpadlcreated->gpadl == gpadlheader->gpadl)) {
+ memcpy(&msginfo->response.gpadl_created,
+ gpadlcreated,
+ sizeof(
+ struct vmbus_channel_gpadl_created));
+ complete(&msginfo->waitevent);
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+}
+
+/*
+ * vmbus_ongpadl_torndown - GPADL torndown handler.
+ *
+ * This is invoked when we received a response to our gpadl teardown request.
+ * Find the matching request, copy the response and signal the requesting
+ * thread.
+ */
+static void vmbus_ongpadl_torndown(
+ struct vmbus_channel_message_header *hdr)
+{
+ struct vmbus_channel_gpadl_torndown *gpadl_torndown;
+ struct vmbus_channel_msginfo *msginfo;
+ struct vmbus_channel_message_header *requestheader;
+ struct vmbus_channel_gpadl_teardown *gpadl_teardown;
+ unsigned long flags;
+
+ gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
+
+ /*
+ * Find the open msg, copy the result and signal/unblock the wait event
+ */
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+
+ list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
+ msglistentry) {
+ requestheader =
+ (struct vmbus_channel_message_header *)msginfo->msg;
+
+ if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
+ gpadl_teardown =
+ (struct vmbus_channel_gpadl_teardown *)requestheader;
+
+ if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
+ memcpy(&msginfo->response.gpadl_torndown,
+ gpadl_torndown,
+ sizeof(
+ struct vmbus_channel_gpadl_torndown));
+ complete(&msginfo->waitevent);
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+}
+
+/*
+ * vmbus_onversion_response - Version response handler
+ *
+ * This is invoked when we received a response to our initiate contact request.
+ * Find the matching request, copy the response and signal the requesting
+ * thread.
+ */
+static void vmbus_onversion_response(
+ struct vmbus_channel_message_header *hdr)
+{
+ struct vmbus_channel_msginfo *msginfo;
+ struct vmbus_channel_message_header *requestheader;
+ struct vmbus_channel_initiate_contact *initiate;
+ struct vmbus_channel_version_response *version_response;
+ unsigned long flags;
+
+ version_response = (struct vmbus_channel_version_response *)hdr;
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+
+ list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
+ msglistentry) {
+ requestheader =
+ (struct vmbus_channel_message_header *)msginfo->msg;
+
+ if (requestheader->msgtype ==
+ CHANNELMSG_INITIATE_CONTACT) {
+ initiate =
+ (struct vmbus_channel_initiate_contact *)requestheader;
+ memcpy(&msginfo->response.version_response,
+ version_response,
+ sizeof(struct vmbus_channel_version_response));
+ complete(&msginfo->waitevent);
+ }
+ }
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+}
+
+/* Channel message dispatch table */
+static struct vmbus_channel_message_table_entry
+ channel_message_table[CHANNELMSG_COUNT] = {
+ {CHANNELMSG_INVALID, NULL},
+ {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
+ {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
+ {CHANNELMSG_REQUESTOFFERS, NULL},
+ {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
+ {CHANNELMSG_OPENCHANNEL, NULL},
+ {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
+ {CHANNELMSG_CLOSECHANNEL, NULL},
+ {CHANNELMSG_GPADL_HEADER, NULL},
+ {CHANNELMSG_GPADL_BODY, NULL},
+ {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
+ {CHANNELMSG_GPADL_TEARDOWN, NULL},
+ {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
+ {CHANNELMSG_RELID_RELEASED, NULL},
+ {CHANNELMSG_INITIATE_CONTACT, NULL},
+ {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
+ {CHANNELMSG_UNLOAD, NULL},
+};
+
+/*
+ * vmbus_onmessage - Handler for channel protocol messages.
+ *
+ * This is invoked in the vmbus worker thread context.
+ */
+void vmbus_onmessage(void *context)
+{
+ struct hv_message *msg = context;
+ struct vmbus_channel_message_header *hdr;
+ int size;
+
+ hdr = (struct vmbus_channel_message_header *)msg->u.payload;
+ size = msg->header.payload_size;
+
+ if (hdr->msgtype >= CHANNELMSG_COUNT) {
+ pr_err("Received invalid channel message type %d size %d\n",
+ hdr->msgtype, size);
+ print_hex_dump_bytes("", DUMP_PREFIX_NONE,
+ (unsigned char *)msg->u.payload, size);
+ return;
+ }
+
+ if (channel_message_table[hdr->msgtype].message_handler)
+ channel_message_table[hdr->msgtype].message_handler(hdr);
+ else
+ pr_err("Unhandled channel message type %d\n", hdr->msgtype);
+}
+
+/*
+ * vmbus_request_offers - Send a request to get all our pending offers.
+ */
+int vmbus_request_offers(void)
+{
+ struct vmbus_channel_message_header *msg;
+ struct vmbus_channel_msginfo *msginfo;
+ int ret;
+
+ msginfo = kmalloc(sizeof(*msginfo) +
+ sizeof(struct vmbus_channel_message_header),
+ GFP_KERNEL);
+ if (!msginfo)
+ return -ENOMEM;
+
+ msg = (struct vmbus_channel_message_header *)msginfo->msg;
+
+ msg->msgtype = CHANNELMSG_REQUESTOFFERS;
+
+
+ ret = vmbus_post_msg(msg,
+ sizeof(struct vmbus_channel_message_header));
+ if (ret != 0) {
+ pr_err("Unable to request offers - %d\n", ret);
+
+ goto cleanup;
+ }
+
+cleanup:
+ kfree(msginfo);
+
+ return ret;
+}
+
+/* eof */
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/connection.c b/ap/os/linux/linux-3.4.x/drivers/hv/connection.c
new file mode 100644
index 0000000..2d52a1b
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/connection.c
@@ -0,0 +1,329 @@
+/*
+ *
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/hyperv.h>
+#include <asm/hyperv.h>
+#include "hyperv_vmbus.h"
+
+
+struct vmbus_connection vmbus_connection = {
+ .conn_state = DISCONNECTED,
+ .next_gpadl_handle = ATOMIC_INIT(0xE1E10),
+};
+
+/*
+ * vmbus_connect - Sends a connect request on the partition service connection
+ */
+int vmbus_connect(void)
+{
+ int ret = 0;
+ int t;
+ struct vmbus_channel_msginfo *msginfo = NULL;
+ struct vmbus_channel_initiate_contact *msg;
+ unsigned long flags;
+
+ /* Initialize the vmbus connection */
+ vmbus_connection.conn_state = CONNECTING;
+ vmbus_connection.work_queue = create_workqueue("hv_vmbus_con");
+ if (!vmbus_connection.work_queue) {
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+
+ INIT_LIST_HEAD(&vmbus_connection.chn_msg_list);
+ spin_lock_init(&vmbus_connection.channelmsg_lock);
+
+ INIT_LIST_HEAD(&vmbus_connection.chn_list);
+ spin_lock_init(&vmbus_connection.channel_lock);
+
+ /*
+ * Setup the vmbus event connection for channel interrupt
+ * abstraction stuff
+ */
+ vmbus_connection.int_page =
+ (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0);
+ if (vmbus_connection.int_page == NULL) {
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+
+ vmbus_connection.recv_int_page = vmbus_connection.int_page;
+ vmbus_connection.send_int_page =
+ (void *)((unsigned long)vmbus_connection.int_page +
+ (PAGE_SIZE >> 1));
+
+ /*
+ * Setup the monitor notification facility. The 1st page for
+ * parent->child and the 2nd page for child->parent
+ */
+ vmbus_connection.monitor_pages =
+ (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 1);
+ if (vmbus_connection.monitor_pages == NULL) {
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+
+ msginfo = kzalloc(sizeof(*msginfo) +
+ sizeof(struct vmbus_channel_initiate_contact),
+ GFP_KERNEL);
+ if (msginfo == NULL) {
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+
+ init_completion(&msginfo->waitevent);
+
+ msg = (struct vmbus_channel_initiate_contact *)msginfo->msg;
+
+ msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
+ msg->vmbus_version_requested = VMBUS_REVISION_NUMBER;
+ msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
+ msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages);
+ msg->monitor_page2 = virt_to_phys(
+ (void *)((unsigned long)vmbus_connection.monitor_pages +
+ PAGE_SIZE));
+
+ /*
+ * Add to list before we send the request since we may
+ * receive the response before returning from this routine
+ */
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_add_tail(&msginfo->msglistentry,
+ &vmbus_connection.chn_msg_list);
+
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+
+ ret = vmbus_post_msg(msg,
+ sizeof(struct vmbus_channel_initiate_contact));
+ if (ret != 0) {
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_del(&msginfo->msglistentry);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
+ flags);
+ goto cleanup;
+ }
+
+ /* Wait for the connection response */
+ t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
+ if (t == 0) {
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock,
+ flags);
+ list_del(&msginfo->msglistentry);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
+ flags);
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+ list_del(&msginfo->msglistentry);
+ spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+
+ /* Check if successful */
+ if (msginfo->response.version_response.version_supported) {
+ vmbus_connection.conn_state = CONNECTED;
+ } else {
+ pr_err("Unable to connect, "
+ "Version %d not supported by Hyper-V\n",
+ VMBUS_REVISION_NUMBER);
+ ret = -ECONNREFUSED;
+ goto cleanup;
+ }
+
+ kfree(msginfo);
+ return 0;
+
+cleanup:
+ vmbus_connection.conn_state = DISCONNECTED;
+
+ if (vmbus_connection.work_queue)
+ destroy_workqueue(vmbus_connection.work_queue);
+
+ if (vmbus_connection.int_page) {
+ free_pages((unsigned long)vmbus_connection.int_page, 0);
+ vmbus_connection.int_page = NULL;
+ }
+
+ if (vmbus_connection.monitor_pages) {
+ free_pages((unsigned long)vmbus_connection.monitor_pages, 1);
+ vmbus_connection.monitor_pages = NULL;
+ }
+
+ kfree(msginfo);
+
+ return ret;
+}
+
+
+/*
+ * relid2channel - Get the channel object given its
+ * child relative id (ie channel id)
+ */
+struct vmbus_channel *relid2channel(u32 relid)
+{
+ struct vmbus_channel *channel;
+ struct vmbus_channel *found_channel = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
+ list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
+ if (channel->offermsg.child_relid == relid) {
+ found_channel = channel;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
+
+ return found_channel;
+}
+
+/*
+ * process_chn_event - Process a channel event notification
+ */
+static void process_chn_event(u32 relid)
+{
+ struct vmbus_channel *channel;
+ unsigned long flags;
+
+ /*
+ * Find the channel based on this relid and invokes the
+ * channel callback to process the event
+ */
+ channel = relid2channel(relid);
+
+ if (!channel) {
+ pr_err("channel not found for relid - %u\n", relid);
+ return;
+ }
+
+ /*
+ * A channel once created is persistent even when there
+ * is no driver handling the device. An unloading driver
+ * sets the onchannel_callback to NULL under the
+ * protection of the channel inbound_lock. Thus, checking
+ * and invoking the driver specific callback takes care of
+ * orderly unloading of the driver.
+ */
+
+ spin_lock_irqsave(&channel->inbound_lock, flags);
+ if (channel->onchannel_callback != NULL)
+ channel->onchannel_callback(channel->channel_callback_context);
+ else
+ pr_err("no channel callback for relid - %u\n", relid);
+
+ spin_unlock_irqrestore(&channel->inbound_lock, flags);
+}
+
+/*
+ * vmbus_on_event - Handler for events
+ */
+void vmbus_on_event(unsigned long data)
+{
+ u32 dword;
+ u32 maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
+ int bit;
+ u32 relid;
+ u32 *recv_int_page = vmbus_connection.recv_int_page;
+
+ /* Check events */
+ if (!recv_int_page)
+ return;
+ for (dword = 0; dword < maxdword; dword++) {
+ if (!recv_int_page[dword])
+ continue;
+ for (bit = 0; bit < 32; bit++) {
+ if (sync_test_and_clear_bit(bit,
+ (unsigned long *)&recv_int_page[dword])) {
+ relid = (dword << 5) + bit;
+
+ if (relid == 0)
+ /*
+ * Special case - vmbus
+ * channel protocol msg
+ */
+ continue;
+
+ process_chn_event(relid);
+ }
+ }
+ }
+}
+
+/*
+ * vmbus_post_msg - Send a msg on the vmbus's message connection
+ */
+int vmbus_post_msg(void *buffer, size_t buflen)
+{
+ union hv_connection_id conn_id;
+ int ret = 0;
+ int retries = 0;
+
+ conn_id.asu32 = 0;
+ conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;
+
+ /*
+ * hv_post_message() can have transient failures because of
+ * insufficient resources. Retry the operation a couple of
+ * times before giving up.
+ */
+ while (retries < 10) {
+ ret = hv_post_message(conn_id, 1, buffer, buflen);
+
+ switch (ret) {
+ case HV_STATUS_INSUFFICIENT_BUFFERS:
+ ret = -ENOMEM;
+ case -ENOMEM:
+ break;
+ case HV_STATUS_SUCCESS:
+ return ret;
+ default:
+ pr_err("hv_post_msg() failed; error code:%d\n", ret);
+ return -EINVAL;
+ }
+
+ retries++;
+ msleep(100);
+ }
+ return ret;
+}
+
+/*
+ * vmbus_set_event - Send an event notification to the parent
+ */
+int vmbus_set_event(u32 child_relid)
+{
+ /* Each u32 represents 32 channels */
+ sync_set_bit(child_relid & 31,
+ (unsigned long *)vmbus_connection.send_int_page +
+ (child_relid >> 5));
+
+ return hv_signal_event();
+}
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/hv.c b/ap/os/linux/linux-3.4.x/drivers/hv/hv.c
new file mode 100644
index 0000000..15956bd
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/hv.c
@@ -0,0 +1,427 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/hyperv.h>
+#include <asm/hyperv.h>
+#include "hyperv_vmbus.h"
+
+/* The one and only */
+struct hv_context hv_context = {
+ .synic_initialized = false,
+ .hypercall_page = NULL,
+ .signal_event_param = NULL,
+ .signal_event_buffer = NULL,
+};
+
+/*
+ * query_hypervisor_presence
+ * - Query the cpuid for presence of windows hypervisor
+ */
+static int query_hypervisor_presence(void)
+{
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+ unsigned int op;
+
+ eax = 0;
+ ebx = 0;
+ ecx = 0;
+ edx = 0;
+ op = HVCPUID_VERSION_FEATURES;
+ cpuid(op, &eax, &ebx, &ecx, &edx);
+
+ return ecx & HV_PRESENT_BIT;
+}
+
+/*
+ * query_hypervisor_info - Get version info of the windows hypervisor
+ */
+static int query_hypervisor_info(void)
+{
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+ unsigned int max_leaf;
+ unsigned int op;
+
+ /*
+ * Its assumed that this is called after confirming that Viridian
+ * is present. Query id and revision.
+ */
+ eax = 0;
+ ebx = 0;
+ ecx = 0;
+ edx = 0;
+ op = HVCPUID_VENDOR_MAXFUNCTION;
+ cpuid(op, &eax, &ebx, &ecx, &edx);
+
+ max_leaf = eax;
+
+ if (max_leaf >= HVCPUID_VERSION) {
+ eax = 0;
+ ebx = 0;
+ ecx = 0;
+ edx = 0;
+ op = HVCPUID_VERSION;
+ cpuid(op, &eax, &ebx, &ecx, &edx);
+ pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n",
+ eax,
+ ebx >> 16,
+ ebx & 0xFFFF,
+ ecx,
+ edx >> 24,
+ edx & 0xFFFFFF);
+ }
+ return max_leaf;
+}
+
+/*
+ * do_hypercall- Invoke the specified hypercall
+ */
+static u64 do_hypercall(u64 control, void *input, void *output)
+{
+#ifdef CONFIG_X86_64
+ u64 hv_status = 0;
+ u64 input_address = (input) ? virt_to_phys(input) : 0;
+ u64 output_address = (output) ? virt_to_phys(output) : 0;
+ void *hypercall_page = hv_context.hypercall_page;
+
+ __asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
+ __asm__ __volatile__("call *%3" : "=a" (hv_status) :
+ "c" (control), "d" (input_address),
+ "m" (hypercall_page));
+
+ return hv_status;
+
+#else
+
+ u32 control_hi = control >> 32;
+ u32 control_lo = control & 0xFFFFFFFF;
+ u32 hv_status_hi = 1;
+ u32 hv_status_lo = 1;
+ u64 input_address = (input) ? virt_to_phys(input) : 0;
+ u32 input_address_hi = input_address >> 32;
+ u32 input_address_lo = input_address & 0xFFFFFFFF;
+ u64 output_address = (output) ? virt_to_phys(output) : 0;
+ u32 output_address_hi = output_address >> 32;
+ u32 output_address_lo = output_address & 0xFFFFFFFF;
+ void *hypercall_page = hv_context.hypercall_page;
+
+ __asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
+ "=a"(hv_status_lo) : "d" (control_hi),
+ "a" (control_lo), "b" (input_address_hi),
+ "c" (input_address_lo), "D"(output_address_hi),
+ "S"(output_address_lo), "m" (hypercall_page));
+
+ return hv_status_lo | ((u64)hv_status_hi << 32);
+#endif /* !x86_64 */
+}
+
+/*
+ * hv_init - Main initialization routine.
+ *
+ * This routine must be called before any other routines in here are called
+ */
+int hv_init(void)
+{
+ int max_leaf;
+ union hv_x64_msr_hypercall_contents hypercall_msr;
+ void *virtaddr = NULL;
+
+ memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
+ memset(hv_context.synic_message_page, 0,
+ sizeof(void *) * NR_CPUS);
+
+ if (!query_hypervisor_presence())
+ goto cleanup;
+
+ max_leaf = query_hypervisor_info();
+
+ /* Write our OS info */
+ wrmsrl(HV_X64_MSR_GUEST_OS_ID, HV_LINUX_GUEST_ID);
+ hv_context.guestid = HV_LINUX_GUEST_ID;
+
+ /* See if the hypercall page is already set */
+ rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
+
+ virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
+
+ if (!virtaddr)
+ goto cleanup;
+
+ hypercall_msr.enable = 1;
+
+ hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
+ wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
+
+ /* Confirm that hypercall page did get setup. */
+ hypercall_msr.as_uint64 = 0;
+ rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
+
+ if (!hypercall_msr.enable)
+ goto cleanup;
+
+ hv_context.hypercall_page = virtaddr;
+
+ /* Setup the global signal event param for the signal event hypercall */
+ hv_context.signal_event_buffer =
+ kmalloc(sizeof(struct hv_input_signal_event_buffer),
+ GFP_KERNEL);
+ if (!hv_context.signal_event_buffer)
+ goto cleanup;
+
+ hv_context.signal_event_param =
+ (struct hv_input_signal_event *)
+ (ALIGN((unsigned long)
+ hv_context.signal_event_buffer,
+ HV_HYPERCALL_PARAM_ALIGN));
+ hv_context.signal_event_param->connectionid.asu32 = 0;
+ hv_context.signal_event_param->connectionid.u.id =
+ VMBUS_EVENT_CONNECTION_ID;
+ hv_context.signal_event_param->flag_number = 0;
+ hv_context.signal_event_param->rsvdz = 0;
+
+ return 0;
+
+cleanup:
+ if (virtaddr) {
+ if (hypercall_msr.enable) {
+ hypercall_msr.as_uint64 = 0;
+ wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
+ }
+
+ vfree(virtaddr);
+ }
+
+ return -ENOTSUPP;
+}
+
+/*
+ * hv_cleanup - Cleanup routine.
+ *
+ * This routine is called normally during driver unloading or exiting.
+ */
+void hv_cleanup(void)
+{
+ union hv_x64_msr_hypercall_contents hypercall_msr;
+
+ /* Reset our OS id */
+ wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
+
+ kfree(hv_context.signal_event_buffer);
+ hv_context.signal_event_buffer = NULL;
+ hv_context.signal_event_param = NULL;
+
+ if (hv_context.hypercall_page) {
+ hypercall_msr.as_uint64 = 0;
+ wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
+ vfree(hv_context.hypercall_page);
+ hv_context.hypercall_page = NULL;
+ }
+}
+
+/*
+ * hv_post_message - Post a message using the hypervisor message IPC.
+ *
+ * This involves a hypercall.
+ */
+u16 hv_post_message(union hv_connection_id connection_id,
+ enum hv_message_type message_type,
+ void *payload, size_t payload_size)
+{
+ struct aligned_input {
+ u64 alignment8;
+ struct hv_input_post_message msg;
+ };
+
+ struct hv_input_post_message *aligned_msg;
+ u16 status;
+ unsigned long addr;
+
+ if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
+ return -EMSGSIZE;
+
+ addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
+ if (!addr)
+ return -ENOMEM;
+
+ aligned_msg = (struct hv_input_post_message *)
+ (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
+
+ aligned_msg->connectionid = connection_id;
+ aligned_msg->message_type = message_type;
+ aligned_msg->payload_size = payload_size;
+ memcpy((void *)aligned_msg->payload, payload, payload_size);
+
+ status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
+ & 0xFFFF;
+
+ kfree((void *)addr);
+
+ return status;
+}
+
+
+/*
+ * hv_signal_event -
+ * Signal an event on the specified connection using the hypervisor event IPC.
+ *
+ * This involves a hypercall.
+ */
+u16 hv_signal_event(void)
+{
+ u16 status;
+
+ status = do_hypercall(HVCALL_SIGNAL_EVENT,
+ hv_context.signal_event_param,
+ NULL) & 0xFFFF;
+ return status;
+}
+
+/*
+ * hv_synic_init - Initialize the Synthethic Interrupt Controller.
+ *
+ * If it is already initialized by another entity (ie x2v shim), we need to
+ * retrieve the initialized message and event pages. Otherwise, we create and
+ * initialize the message and event pages.
+ */
+void hv_synic_init(void *irqarg)
+{
+ u64 version;
+ union hv_synic_simp simp;
+ union hv_synic_siefp siefp;
+ union hv_synic_sint shared_sint;
+ union hv_synic_scontrol sctrl;
+
+ u32 irq_vector = *((u32 *)(irqarg));
+ int cpu = smp_processor_id();
+
+ if (!hv_context.hypercall_page)
+ return;
+
+ /* Check the version */
+ rdmsrl(HV_X64_MSR_SVERSION, version);
+
+ hv_context.synic_message_page[cpu] =
+ (void *)get_zeroed_page(GFP_ATOMIC);
+
+ if (hv_context.synic_message_page[cpu] == NULL) {
+ pr_err("Unable to allocate SYNIC message page\n");
+ goto cleanup;
+ }
+
+ hv_context.synic_event_page[cpu] =
+ (void *)get_zeroed_page(GFP_ATOMIC);
+
+ if (hv_context.synic_event_page[cpu] == NULL) {
+ pr_err("Unable to allocate SYNIC event page\n");
+ goto cleanup;
+ }
+
+ /* Setup the Synic's message page */
+ rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
+ simp.simp_enabled = 1;
+ simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
+ >> PAGE_SHIFT;
+
+ wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
+
+ /* Setup the Synic's event page */
+ rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
+ siefp.siefp_enabled = 1;
+ siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
+ >> PAGE_SHIFT;
+
+ wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
+
+ /* Setup the shared SINT. */
+ rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+
+ shared_sint.as_uint64 = 0;
+ shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
+ shared_sint.masked = false;
+ shared_sint.auto_eoi = false;
+
+ wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+
+ /* Enable the global synic bit */
+ rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
+ sctrl.enable = 1;
+
+ wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
+
+ hv_context.synic_initialized = true;
+ return;
+
+cleanup:
+ if (hv_context.synic_event_page[cpu])
+ free_page((unsigned long)hv_context.synic_event_page[cpu]);
+
+ if (hv_context.synic_message_page[cpu])
+ free_page((unsigned long)hv_context.synic_message_page[cpu]);
+ return;
+}
+
+/*
+ * hv_synic_cleanup - Cleanup routine for hv_synic_init().
+ */
+void hv_synic_cleanup(void *arg)
+{
+ union hv_synic_sint shared_sint;
+ union hv_synic_simp simp;
+ union hv_synic_siefp siefp;
+ int cpu = smp_processor_id();
+
+ if (!hv_context.synic_initialized)
+ return;
+
+ rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+
+ shared_sint.masked = 1;
+
+ /* Need to correctly cleanup in the case of SMP!!! */
+ /* Disable the interrupt */
+ wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+
+ rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
+ simp.simp_enabled = 0;
+ simp.base_simp_gpa = 0;
+
+ wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
+
+ rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
+ siefp.siefp_enabled = 0;
+ siefp.base_siefp_gpa = 0;
+
+ wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
+
+ free_page((unsigned long)hv_context.synic_message_page[cpu]);
+ free_page((unsigned long)hv_context.synic_event_page[cpu]);
+}
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/hv_kvp.c b/ap/os/linux/linux-3.4.x/drivers/hv/hv_kvp.c
new file mode 100644
index 0000000..6186025
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/hv_kvp.c
@@ -0,0 +1,466 @@
+/*
+ * An implementation of key value pair (KVP) functionality for Linux.
+ *
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/net.h>
+#include <linux/nls.h>
+#include <linux/connector.h>
+#include <linux/workqueue.h>
+#include <linux/hyperv.h>
+
+
+
+/*
+ * Global state maintained for transaction that is being processed.
+ * Note that only one transaction can be active at any point in time.
+ *
+ * This state is set when we receive a request from the host; we
+ * cleanup this state when the transaction is completed - when we respond
+ * to the host with the key value.
+ */
+
+static struct {
+ bool active; /* transaction status - active or not */
+ int recv_len; /* number of bytes received. */
+ struct hv_kvp_msg *kvp_msg; /* current message */
+ struct vmbus_channel *recv_channel; /* chn we got the request */
+ u64 recv_req_id; /* request ID. */
+ void *kvp_context; /* for the channel callback */
+} kvp_transaction;
+
+static void kvp_send_key(struct work_struct *dummy);
+
+#define TIMEOUT_FIRED 1
+
+static void kvp_respond_to_host(char *key, char *value, int error);
+static void kvp_work_func(struct work_struct *dummy);
+static void kvp_register(void);
+
+static DECLARE_DELAYED_WORK(kvp_work, kvp_work_func);
+static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
+
+static struct cb_id kvp_id = { CN_KVP_IDX, CN_KVP_VAL };
+static const char kvp_name[] = "kvp_kernel_module";
+static u8 *recv_buffer;
+/*
+ * Register the kernel component with the user-level daemon.
+ * As part of this registration, pass the LIC version number.
+ */
+
+static void
+kvp_register(void)
+{
+
+ struct cn_msg *msg;
+ struct hv_kvp_msg *kvp_msg;
+ char *version;
+
+ msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg), GFP_ATOMIC);
+
+ if (msg) {
+ kvp_msg = (struct hv_kvp_msg *)msg->data;
+ version = kvp_msg->body.kvp_register.version;
+ msg->id.idx = CN_KVP_IDX;
+ msg->id.val = CN_KVP_VAL;
+
+ kvp_msg->kvp_hdr.operation = KVP_OP_REGISTER;
+ strcpy(version, HV_DRV_VERSION);
+ msg->len = sizeof(struct hv_kvp_msg);
+ cn_netlink_send(msg, 0, GFP_ATOMIC);
+ kfree(msg);
+ }
+}
+static void
+kvp_work_func(struct work_struct *dummy)
+{
+ /*
+ * If the timer fires, the user-mode component has not responded;
+ * process the pending transaction.
+ */
+ kvp_respond_to_host("Unknown key", "Guest timed out", TIMEOUT_FIRED);
+}
+
+/*
+ * Callback when data is received from user mode.
+ */
+
+static void
+kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
+{
+ struct hv_kvp_msg *message;
+ struct hv_kvp_msg_enumerate *data;
+
+ message = (struct hv_kvp_msg *)msg->data;
+ switch (message->kvp_hdr.operation) {
+ case KVP_OP_REGISTER:
+ pr_info("KVP: user-mode registering done.\n");
+ kvp_register();
+ kvp_transaction.active = false;
+ hv_kvp_onchannelcallback(kvp_transaction.kvp_context);
+ break;
+
+ default:
+ data = &message->body.kvp_enum_data;
+ /*
+ * Complete the transaction by forwarding the key value
+ * to the host. But first, cancel the timeout.
+ */
+ if (cancel_delayed_work_sync(&kvp_work))
+ kvp_respond_to_host(data->data.key,
+ data->data.value,
+ !strlen(data->data.key));
+ }
+}
+
+static void
+kvp_send_key(struct work_struct *dummy)
+{
+ struct cn_msg *msg;
+ struct hv_kvp_msg *message;
+ struct hv_kvp_msg *in_msg;
+ __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation;
+ __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool;
+ __u32 val32;
+ __u64 val64;
+
+ msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC);
+ if (!msg)
+ return;
+
+ msg->id.idx = CN_KVP_IDX;
+ msg->id.val = CN_KVP_VAL;
+
+ message = (struct hv_kvp_msg *)msg->data;
+ message->kvp_hdr.operation = operation;
+ message->kvp_hdr.pool = pool;
+ in_msg = kvp_transaction.kvp_msg;
+
+ /*
+ * The key/value strings sent from the host are encoded in
+ * in utf16; convert it to utf8 strings.
+ * The host assures us that the utf16 strings will not exceed
+ * the max lengths specified. We will however, reserve room
+ * for the string terminating character - in the utf16s_utf8s()
+ * function we limit the size of the buffer where the converted
+ * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee
+ * that the strings can be properly terminated!
+ */
+
+ switch (message->kvp_hdr.operation) {
+ case KVP_OP_SET:
+ switch (in_msg->body.kvp_set.data.value_type) {
+ case REG_SZ:
+ /*
+ * The value is a string - utf16 encoding.
+ */
+ message->body.kvp_set.data.value_size =
+ utf16s_to_utf8s(
+ (wchar_t *)in_msg->body.kvp_set.data.value,
+ in_msg->body.kvp_set.data.value_size,
+ UTF16_LITTLE_ENDIAN,
+ message->body.kvp_set.data.value,
+ HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1;
+ break;
+
+ case REG_U32:
+ /*
+ * The value is a 32 bit scalar.
+ * We save this as a utf8 string.
+ */
+ val32 = in_msg->body.kvp_set.data.value_u32;
+ message->body.kvp_set.data.value_size =
+ sprintf(message->body.kvp_set.data.value,
+ "%d", val32) + 1;
+ break;
+
+ case REG_U64:
+ /*
+ * The value is a 64 bit scalar.
+ * We save this as a utf8 string.
+ */
+ val64 = in_msg->body.kvp_set.data.value_u64;
+ message->body.kvp_set.data.value_size =
+ sprintf(message->body.kvp_set.data.value,
+ "%llu", val64) + 1;
+ break;
+
+ }
+ case KVP_OP_GET:
+ message->body.kvp_set.data.key_size =
+ utf16s_to_utf8s(
+ (wchar_t *)in_msg->body.kvp_set.data.key,
+ in_msg->body.kvp_set.data.key_size,
+ UTF16_LITTLE_ENDIAN,
+ message->body.kvp_set.data.key,
+ HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
+ break;
+
+ case KVP_OP_DELETE:
+ message->body.kvp_delete.key_size =
+ utf16s_to_utf8s(
+ (wchar_t *)in_msg->body.kvp_delete.key,
+ in_msg->body.kvp_delete.key_size,
+ UTF16_LITTLE_ENDIAN,
+ message->body.kvp_delete.key,
+ HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
+ break;
+
+ case KVP_OP_ENUMERATE:
+ message->body.kvp_enum_data.index =
+ in_msg->body.kvp_enum_data.index;
+ break;
+ }
+
+ msg->len = sizeof(struct hv_kvp_msg);
+ cn_netlink_send(msg, 0, GFP_ATOMIC);
+ kfree(msg);
+
+ return;
+}
+
+/*
+ * Send a response back to the host.
+ */
+
+static void
+kvp_respond_to_host(char *key, char *value, int error)
+{
+ struct hv_kvp_msg *kvp_msg;
+ struct hv_kvp_exchg_msg_value *kvp_data;
+ char *key_name;
+ struct icmsg_hdr *icmsghdrp;
+ int keylen = 0;
+ int valuelen = 0;
+ u32 buf_len;
+ struct vmbus_channel *channel;
+ u64 req_id;
+
+ /*
+ * If a transaction is not active; log and return.
+ */
+
+ if (!kvp_transaction.active) {
+ /*
+ * This is a spurious call!
+ */
+ pr_warn("KVP: Transaction not active\n");
+ return;
+ }
+ /*
+ * Copy the global state for completing the transaction. Note that
+ * only one transaction can be active at a time.
+ */
+
+ buf_len = kvp_transaction.recv_len;
+ channel = kvp_transaction.recv_channel;
+ req_id = kvp_transaction.recv_req_id;
+
+ kvp_transaction.active = false;
+
+ icmsghdrp = (struct icmsg_hdr *)
+ &recv_buffer[sizeof(struct vmbuspipe_hdr)];
+
+ if (channel->onchannel_callback == NULL)
+ /*
+ * We have raced with util driver being unloaded;
+ * silently return.
+ */
+ return;
+
+
+ /*
+ * If the error parameter is set, terminate the host's enumeration
+ * on this pool.
+ */
+ if (error) {
+ /*
+ * Something failed or the we have timedout;
+ * terminate the current host-side iteration.
+ */
+ icmsghdrp->status = HV_S_CONT;
+ goto response_done;
+ }
+
+ icmsghdrp->status = HV_S_OK;
+
+ kvp_msg = (struct hv_kvp_msg *)
+ &recv_buffer[sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+
+ switch (kvp_transaction.kvp_msg->kvp_hdr.operation) {
+ case KVP_OP_GET:
+ kvp_data = &kvp_msg->body.kvp_get.data;
+ goto copy_value;
+
+ case KVP_OP_SET:
+ case KVP_OP_DELETE:
+ goto response_done;
+
+ default:
+ break;
+ }
+
+ kvp_data = &kvp_msg->body.kvp_enum_data.data;
+ key_name = key;
+
+ /*
+ * The windows host expects the key/value pair to be encoded
+ * in utf16. Ensure that the key/value size reported to the host
+ * will be less than or equal to the MAX size (including the
+ * terminating character).
+ */
+ keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN,
+ (wchar_t *) kvp_data->key,
+ (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2);
+ kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */
+
+copy_value:
+ valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN,
+ (wchar_t *) kvp_data->value,
+ (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2);
+ kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */
+
+ /*
+ * If the utf8s to utf16s conversion failed; notify host
+ * of the error.
+ */
+ if ((keylen < 0) || (valuelen < 0))
+ icmsghdrp->status = HV_E_FAIL;
+
+ kvp_data->value_type = REG_SZ; /* all our values are strings */
+
+response_done:
+ icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
+
+ vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
+ VM_PKT_DATA_INBAND, 0);
+
+}
+
+/*
+ * This callback is invoked when we get a KVP message from the host.
+ * The host ensures that only one KVP transaction can be active at a time.
+ * KVP implementation in Linux needs to forward the key to a user-mde
+ * component to retrive the corresponding value. Consequently, we cannot
+ * respond to the host in the conext of this callback. Since the host
+ * guarantees that at most only one transaction can be active at a time,
+ * we stash away the transaction state in a set of global variables.
+ */
+
+void hv_kvp_onchannelcallback(void *context)
+{
+ struct vmbus_channel *channel = context;
+ u32 recvlen;
+ u64 requestid;
+
+ struct hv_kvp_msg *kvp_msg;
+
+ struct icmsg_hdr *icmsghdrp;
+ struct icmsg_negotiate *negop = NULL;
+
+ if (kvp_transaction.active) {
+ /*
+ * We will defer processing this callback once
+ * the current transaction is complete.
+ */
+ kvp_transaction.kvp_context = context;
+ return;
+ }
+
+ vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE, &recvlen, &requestid);
+
+ if (recvlen > 0) {
+ icmsghdrp = (struct icmsg_hdr *)&recv_buffer[
+ sizeof(struct vmbuspipe_hdr)];
+
+ if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+ vmbus_prep_negotiate_resp(icmsghdrp, negop, recv_buffer);
+ } else {
+ kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
+ sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+
+ /*
+ * Stash away this global state for completing the
+ * transaction; note transactions are serialized.
+ */
+
+ kvp_transaction.recv_len = recvlen;
+ kvp_transaction.recv_channel = channel;
+ kvp_transaction.recv_req_id = requestid;
+ kvp_transaction.active = true;
+ kvp_transaction.kvp_msg = kvp_msg;
+
+ /*
+ * Get the information from the
+ * user-mode component.
+ * component. This transaction will be
+ * completed when we get the value from
+ * the user-mode component.
+ * Set a timeout to deal with
+ * user-mode not responding.
+ */
+ schedule_work(&kvp_sendkey_work);
+ schedule_delayed_work(&kvp_work, 5*HZ);
+
+ return;
+
+ }
+
+ icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
+ | ICMSGHDRFLAG_RESPONSE;
+
+ vmbus_sendpacket(channel, recv_buffer,
+ recvlen, requestid,
+ VM_PKT_DATA_INBAND, 0);
+ }
+
+}
+
+int
+hv_kvp_init(struct hv_util_service *srv)
+{
+ int err;
+
+ err = cn_add_callback(&kvp_id, kvp_name, kvp_cn_callback);
+ if (err)
+ return err;
+ recv_buffer = srv->recv_buffer;
+
+ /*
+ * When this driver loads, the user level daemon that
+ * processes the host requests may not yet be running.
+ * Defer processing channel callbacks until the daemon
+ * has registered.
+ */
+ kvp_transaction.active = true;
+
+ return 0;
+}
+
+void hv_kvp_deinit(void)
+{
+ cn_del_callback(&kvp_id);
+ cancel_delayed_work_sync(&kvp_work);
+ cancel_work_sync(&kvp_sendkey_work);
+}
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/hv_util.c b/ap/os/linux/linux-3.4.x/drivers/hv/hv_util.c
new file mode 100644
index 0000000..dbb8b8e
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/hv_util.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright (c) 2010, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sysctl.h>
+#include <linux/reboot.h>
+#include <linux/hyperv.h>
+
+static void shutdown_onchannelcallback(void *context);
+static struct hv_util_service util_shutdown = {
+ .util_cb = shutdown_onchannelcallback,
+};
+
+static void timesync_onchannelcallback(void *context);
+static struct hv_util_service util_timesynch = {
+ .util_cb = timesync_onchannelcallback,
+};
+
+static void heartbeat_onchannelcallback(void *context);
+static struct hv_util_service util_heartbeat = {
+ .util_cb = heartbeat_onchannelcallback,
+};
+
+static struct hv_util_service util_kvp = {
+ .util_cb = hv_kvp_onchannelcallback,
+ .util_init = hv_kvp_init,
+ .util_deinit = hv_kvp_deinit,
+};
+
+static void shutdown_onchannelcallback(void *context)
+{
+ struct vmbus_channel *channel = context;
+ u32 recvlen;
+ u64 requestid;
+ u8 execute_shutdown = false;
+ u8 *shut_txf_buf = util_shutdown.recv_buffer;
+
+ struct shutdown_msg_data *shutdown_msg;
+
+ struct icmsg_hdr *icmsghdrp;
+ struct icmsg_negotiate *negop = NULL;
+
+ vmbus_recvpacket(channel, shut_txf_buf,
+ PAGE_SIZE, &recvlen, &requestid);
+
+ if (recvlen > 0) {
+ icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
+ sizeof(struct vmbuspipe_hdr)];
+
+ if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+ vmbus_prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
+ } else {
+ shutdown_msg =
+ (struct shutdown_msg_data *)&shut_txf_buf[
+ sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+
+ switch (shutdown_msg->flags) {
+ case 0:
+ case 1:
+ icmsghdrp->status = HV_S_OK;
+ execute_shutdown = true;
+
+ pr_info("Shutdown request received -"
+ " graceful shutdown initiated\n");
+ break;
+ default:
+ icmsghdrp->status = HV_E_FAIL;
+ execute_shutdown = false;
+
+ pr_info("Shutdown request received -"
+ " Invalid request\n");
+ break;
+ }
+ }
+
+ icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
+ | ICMSGHDRFLAG_RESPONSE;
+
+ vmbus_sendpacket(channel, shut_txf_buf,
+ recvlen, requestid,
+ VM_PKT_DATA_INBAND, 0);
+ }
+
+ if (execute_shutdown == true)
+ orderly_poweroff(true);
+}
+
+/*
+ * Set guest time to host UTC time.
+ */
+static inline void do_adj_guesttime(u64 hosttime)
+{
+ s64 host_tns;
+ struct timespec host_ts;
+
+ host_tns = (hosttime - WLTIMEDELTA) * 100;
+ host_ts = ns_to_timespec(host_tns);
+
+ do_settimeofday(&host_ts);
+}
+
+/*
+ * Set the host time in a process context.
+ */
+
+struct adj_time_work {
+ struct work_struct work;
+ u64 host_time;
+};
+
+static void hv_set_host_time(struct work_struct *work)
+{
+ struct adj_time_work *wrk;
+
+ wrk = container_of(work, struct adj_time_work, work);
+ do_adj_guesttime(wrk->host_time);
+ kfree(wrk);
+}
+
+/*
+ * Synchronize time with host after reboot, restore, etc.
+ *
+ * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
+ * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
+ * message after the timesync channel is opened. Since the hv_utils module is
+ * loaded after hv_vmbus, the first message is usually missed. The other
+ * thing is, systime is automatically set to emulated hardware clock which may
+ * not be UTC time or in the same time zone. So, to override these effects, we
+ * use the first 50 time samples for initial system time setting.
+ */
+static inline void adj_guesttime(u64 hosttime, u8 flags)
+{
+ struct adj_time_work *wrk;
+ static s32 scnt = 50;
+
+ wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
+ if (wrk == NULL)
+ return;
+
+ wrk->host_time = hosttime;
+ if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
+ INIT_WORK(&wrk->work, hv_set_host_time);
+ schedule_work(&wrk->work);
+ return;
+ }
+
+ if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
+ scnt--;
+ INIT_WORK(&wrk->work, hv_set_host_time);
+ schedule_work(&wrk->work);
+ } else
+ kfree(wrk);
+}
+
+/*
+ * Time Sync Channel message handler.
+ */
+static void timesync_onchannelcallback(void *context)
+{
+ struct vmbus_channel *channel = context;
+ u32 recvlen;
+ u64 requestid;
+ struct icmsg_hdr *icmsghdrp;
+ struct ictimesync_data *timedatap;
+ u8 *time_txf_buf = util_timesynch.recv_buffer;
+
+ vmbus_recvpacket(channel, time_txf_buf,
+ PAGE_SIZE, &recvlen, &requestid);
+
+ if (recvlen > 0) {
+ icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
+ sizeof(struct vmbuspipe_hdr)];
+
+ if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+ vmbus_prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
+ } else {
+ timedatap = (struct ictimesync_data *)&time_txf_buf[
+ sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+ adj_guesttime(timedatap->parenttime, timedatap->flags);
+ }
+
+ icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
+ | ICMSGHDRFLAG_RESPONSE;
+
+ vmbus_sendpacket(channel, time_txf_buf,
+ recvlen, requestid,
+ VM_PKT_DATA_INBAND, 0);
+ }
+}
+
+/*
+ * Heartbeat functionality.
+ * Every two seconds, Hyper-V send us a heartbeat request message.
+ * we respond to this message, and Hyper-V knows we are alive.
+ */
+static void heartbeat_onchannelcallback(void *context)
+{
+ struct vmbus_channel *channel = context;
+ u32 recvlen;
+ u64 requestid;
+ struct icmsg_hdr *icmsghdrp;
+ struct heartbeat_msg_data *heartbeat_msg;
+ u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
+
+ vmbus_recvpacket(channel, hbeat_txf_buf,
+ PAGE_SIZE, &recvlen, &requestid);
+
+ if (recvlen > 0) {
+ icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
+ sizeof(struct vmbuspipe_hdr)];
+
+ if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+ vmbus_prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
+ } else {
+ heartbeat_msg =
+ (struct heartbeat_msg_data *)&hbeat_txf_buf[
+ sizeof(struct vmbuspipe_hdr) +
+ sizeof(struct icmsg_hdr)];
+
+ heartbeat_msg->seq_num += 1;
+ }
+
+ icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
+ | ICMSGHDRFLAG_RESPONSE;
+
+ vmbus_sendpacket(channel, hbeat_txf_buf,
+ recvlen, requestid,
+ VM_PKT_DATA_INBAND, 0);
+ }
+}
+
+static int util_probe(struct hv_device *dev,
+ const struct hv_vmbus_device_id *dev_id)
+{
+ struct hv_util_service *srv =
+ (struct hv_util_service *)dev_id->driver_data;
+ int ret;
+
+ srv->recv_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!srv->recv_buffer)
+ return -ENOMEM;
+ if (srv->util_init) {
+ ret = srv->util_init(srv);
+ if (ret) {
+ ret = -ENODEV;
+ goto error1;
+ }
+ }
+
+ ret = vmbus_open(dev->channel, 2 * PAGE_SIZE, 2 * PAGE_SIZE, NULL, 0,
+ srv->util_cb, dev->channel);
+ if (ret)
+ goto error;
+
+ hv_set_drvdata(dev, srv);
+ return 0;
+
+error:
+ if (srv->util_deinit)
+ srv->util_deinit();
+error1:
+ kfree(srv->recv_buffer);
+ return ret;
+}
+
+static int util_remove(struct hv_device *dev)
+{
+ struct hv_util_service *srv = hv_get_drvdata(dev);
+
+ vmbus_close(dev->channel);
+ if (srv->util_deinit)
+ srv->util_deinit();
+ kfree(srv->recv_buffer);
+
+ return 0;
+}
+
+static const struct hv_vmbus_device_id id_table[] = {
+ /* Shutdown guid */
+ { VMBUS_DEVICE(0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
+ 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB)
+ .driver_data = (unsigned long)&util_shutdown },
+ /* Time synch guid */
+ { VMBUS_DEVICE(0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
+ 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
+ .driver_data = (unsigned long)&util_timesynch },
+ /* Heartbeat guid */
+ { VMBUS_DEVICE(0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
+ 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
+ .driver_data = (unsigned long)&util_heartbeat },
+ /* KVP guid */
+ { VMBUS_DEVICE(0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
+ 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6)
+ .driver_data = (unsigned long)&util_kvp },
+ { },
+};
+
+MODULE_DEVICE_TABLE(vmbus, id_table);
+
+/* The one and only one */
+static struct hv_driver util_drv = {
+ .name = "hv_util",
+ .id_table = id_table,
+ .probe = util_probe,
+ .remove = util_remove,
+};
+
+static int __init init_hyperv_utils(void)
+{
+ pr_info("Registering HyperV Utility Driver\n");
+
+ return vmbus_driver_register(&util_drv);
+}
+
+static void exit_hyperv_utils(void)
+{
+ pr_info("De-Registered HyperV Utility Driver\n");
+
+ vmbus_driver_unregister(&util_drv);
+}
+
+module_init(init_hyperv_utils);
+module_exit(exit_hyperv_utils);
+
+MODULE_DESCRIPTION("Hyper-V Utilities");
+MODULE_VERSION(HV_DRV_VERSION);
+MODULE_LICENSE("GPL");
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/hyperv_vmbus.h b/ap/os/linux/linux-3.4.x/drivers/hv/hyperv_vmbus.h
new file mode 100644
index 0000000..699f0d8
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/hyperv_vmbus.h
@@ -0,0 +1,626 @@
+/*
+ *
+ * Copyright (c) 2011, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ * K. Y. Srinivasan <kys@microsoft.com>
+ *
+ */
+
+#ifndef _HYPERV_VMBUS_H
+#define _HYPERV_VMBUS_H
+
+#include <linux/list.h>
+#include <asm/sync_bitops.h>
+#include <linux/atomic.h>
+#include <linux/hyperv.h>
+
+/*
+ * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
+ * is set by CPUID(HVCPUID_VERSION_FEATURES).
+ */
+enum hv_cpuid_function {
+ HVCPUID_VERSION_FEATURES = 0x00000001,
+ HVCPUID_VENDOR_MAXFUNCTION = 0x40000000,
+ HVCPUID_INTERFACE = 0x40000001,
+
+ /*
+ * The remaining functions depend on the value of
+ * HVCPUID_INTERFACE
+ */
+ HVCPUID_VERSION = 0x40000002,
+ HVCPUID_FEATURES = 0x40000003,
+ HVCPUID_ENLIGHTENMENT_INFO = 0x40000004,
+ HVCPUID_IMPLEMENTATION_LIMITS = 0x40000005,
+};
+
+/* Define version of the synthetic interrupt controller. */
+#define HV_SYNIC_VERSION (1)
+
+/* Define the expected SynIC version. */
+#define HV_SYNIC_VERSION_1 (0x1)
+
+/* Define synthetic interrupt controller message constants. */
+#define HV_MESSAGE_SIZE (256)
+#define HV_MESSAGE_PAYLOAD_BYTE_COUNT (240)
+#define HV_MESSAGE_PAYLOAD_QWORD_COUNT (30)
+#define HV_ANY_VP (0xFFFFFFFF)
+
+/* Define synthetic interrupt controller flag constants. */
+#define HV_EVENT_FLAGS_COUNT (256 * 8)
+#define HV_EVENT_FLAGS_BYTE_COUNT (256)
+#define HV_EVENT_FLAGS_DWORD_COUNT (256 / sizeof(u32))
+
+/* Define hypervisor message types. */
+enum hv_message_type {
+ HVMSG_NONE = 0x00000000,
+
+ /* Memory access messages. */
+ HVMSG_UNMAPPED_GPA = 0x80000000,
+ HVMSG_GPA_INTERCEPT = 0x80000001,
+
+ /* Timer notification messages. */
+ HVMSG_TIMER_EXPIRED = 0x80000010,
+
+ /* Error messages. */
+ HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
+ HVMSG_UNRECOVERABLE_EXCEPTION = 0x80000021,
+ HVMSG_UNSUPPORTED_FEATURE = 0x80000022,
+
+ /* Trace buffer complete messages. */
+ HVMSG_EVENTLOG_BUFFERCOMPLETE = 0x80000040,
+
+ /* Platform-specific processor intercept messages. */
+ HVMSG_X64_IOPORT_INTERCEPT = 0x80010000,
+ HVMSG_X64_MSR_INTERCEPT = 0x80010001,
+ HVMSG_X64_CPUID_INTERCEPT = 0x80010002,
+ HVMSG_X64_EXCEPTION_INTERCEPT = 0x80010003,
+ HVMSG_X64_APIC_EOI = 0x80010004,
+ HVMSG_X64_LEGACY_FP_ERROR = 0x80010005
+};
+
+/* Define the number of synthetic interrupt sources. */
+#define HV_SYNIC_SINT_COUNT (16)
+#define HV_SYNIC_STIMER_COUNT (4)
+
+/* Define invalid partition identifier. */
+#define HV_PARTITION_ID_INVALID ((u64)0x0)
+
+/* Define connection identifier type. */
+union hv_connection_id {
+ u32 asu32;
+ struct {
+ u32 id:24;
+ u32 reserved:8;
+ } u;
+};
+
+/* Define port identifier type. */
+union hv_port_id {
+ u32 asu32;
+ struct {
+ u32 id:24;
+ u32 reserved:8;
+ } u ;
+};
+
+/* Define port type. */
+enum hv_port_type {
+ HVPORT_MSG = 1,
+ HVPORT_EVENT = 2,
+ HVPORT_MONITOR = 3
+};
+
+/* Define port information structure. */
+struct hv_port_info {
+ enum hv_port_type port_type;
+ u32 padding;
+ union {
+ struct {
+ u32 target_sint;
+ u32 target_vp;
+ u64 rsvdz;
+ } message_port_info;
+ struct {
+ u32 target_sint;
+ u32 target_vp;
+ u16 base_flag_bumber;
+ u16 flag_count;
+ u32 rsvdz;
+ } event_port_info;
+ struct {
+ u64 monitor_address;
+ u64 rsvdz;
+ } monitor_port_info;
+ };
+};
+
+struct hv_connection_info {
+ enum hv_port_type port_type;
+ u32 padding;
+ union {
+ struct {
+ u64 rsvdz;
+ } message_connection_info;
+ struct {
+ u64 rsvdz;
+ } event_connection_info;
+ struct {
+ u64 monitor_address;
+ } monitor_connection_info;
+ };
+};
+
+/* Define synthetic interrupt controller message flags. */
+union hv_message_flags {
+ u8 asu8;
+ struct {
+ u8 msg_pending:1;
+ u8 reserved:7;
+ };
+};
+
+/* Define synthetic interrupt controller message header. */
+struct hv_message_header {
+ enum hv_message_type message_type;
+ u8 payload_size;
+ union hv_message_flags message_flags;
+ u8 reserved[2];
+ union {
+ u64 sender;
+ union hv_port_id port;
+ };
+};
+
+/* Define timer message payload structure. */
+struct hv_timer_message_payload {
+ u32 timer_index;
+ u32 reserved;
+ u64 expiration_time; /* When the timer expired */
+ u64 delivery_time; /* When the message was delivered */
+};
+
+/* Define synthetic interrupt controller message format. */
+struct hv_message {
+ struct hv_message_header header;
+ union {
+ u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
+ } u ;
+};
+
+/* Define the number of message buffers associated with each port. */
+#define HV_PORT_MESSAGE_BUFFER_COUNT (16)
+
+/* Define the synthetic interrupt message page layout. */
+struct hv_message_page {
+ struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
+};
+
+/* Define the synthetic interrupt controller event flags format. */
+union hv_synic_event_flags {
+ u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
+ u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
+};
+
+/* Define the synthetic interrupt flags page layout. */
+struct hv_synic_event_flags_page {
+ union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
+};
+
+/* Define SynIC control register. */
+union hv_synic_scontrol {
+ u64 as_uint64;
+ struct {
+ u64 enable:1;
+ u64 reserved:63;
+ };
+};
+
+/* Define synthetic interrupt source. */
+union hv_synic_sint {
+ u64 as_uint64;
+ struct {
+ u64 vector:8;
+ u64 reserved1:8;
+ u64 masked:1;
+ u64 auto_eoi:1;
+ u64 reserved2:46;
+ };
+};
+
+/* Define the format of the SIMP register */
+union hv_synic_simp {
+ u64 as_uint64;
+ struct {
+ u64 simp_enabled:1;
+ u64 preserved:11;
+ u64 base_simp_gpa:52;
+ };
+};
+
+/* Define the format of the SIEFP register */
+union hv_synic_siefp {
+ u64 as_uint64;
+ struct {
+ u64 siefp_enabled:1;
+ u64 preserved:11;
+ u64 base_siefp_gpa:52;
+ };
+};
+
+/* Definitions for the monitored notification facility */
+union hv_monitor_trigger_group {
+ u64 as_uint64;
+ struct {
+ u32 pending;
+ u32 armed;
+ };
+};
+
+struct hv_monitor_parameter {
+ union hv_connection_id connectionid;
+ u16 flagnumber;
+ u16 rsvdz;
+};
+
+union hv_monitor_trigger_state {
+ u32 asu32;
+
+ struct {
+ u32 group_enable:4;
+ u32 rsvdz:28;
+ };
+};
+
+/* struct hv_monitor_page Layout */
+/* ------------------------------------------------------ */
+/* | 0 | TriggerState (4 bytes) | Rsvd1 (4 bytes) | */
+/* | 8 | TriggerGroup[0] | */
+/* | 10 | TriggerGroup[1] | */
+/* | 18 | TriggerGroup[2] | */
+/* | 20 | TriggerGroup[3] | */
+/* | 28 | Rsvd2[0] | */
+/* | 30 | Rsvd2[1] | */
+/* | 38 | Rsvd2[2] | */
+/* | 40 | NextCheckTime[0][0] | NextCheckTime[0][1] | */
+/* | ... | */
+/* | 240 | Latency[0][0..3] | */
+/* | 340 | Rsvz3[0] | */
+/* | 440 | Parameter[0][0] | */
+/* | 448 | Parameter[0][1] | */
+/* | ... | */
+/* | 840 | Rsvd4[0] | */
+/* ------------------------------------------------------ */
+struct hv_monitor_page {
+ union hv_monitor_trigger_state trigger_state;
+ u32 rsvdz1;
+
+ union hv_monitor_trigger_group trigger_group[4];
+ u64 rsvdz2[3];
+
+ s32 next_checktime[4][32];
+
+ u16 latency[4][32];
+ u64 rsvdz3[32];
+
+ struct hv_monitor_parameter parameter[4][32];
+
+ u8 rsvdz4[1984];
+};
+
+/* Declare the various hypercall operations. */
+enum hv_call_code {
+ HVCALL_POST_MESSAGE = 0x005c,
+ HVCALL_SIGNAL_EVENT = 0x005d,
+};
+
+/* Definition of the hv_post_message hypercall input structure. */
+struct hv_input_post_message {
+ union hv_connection_id connectionid;
+ u32 reserved;
+ enum hv_message_type message_type;
+ u32 payload_size;
+ u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
+};
+
+/* Definition of the hv_signal_event hypercall input structure. */
+struct hv_input_signal_event {
+ union hv_connection_id connectionid;
+ u16 flag_number;
+ u16 rsvdz;
+};
+
+/*
+ * Versioning definitions used for guests reporting themselves to the
+ * hypervisor, and visa versa.
+ */
+
+/* Version info reported by guest OS's */
+enum hv_guest_os_vendor {
+ HVGUESTOS_VENDOR_MICROSOFT = 0x0001
+};
+
+enum hv_guest_os_microsoft_ids {
+ HVGUESTOS_MICROSOFT_UNDEFINED = 0x00,
+ HVGUESTOS_MICROSOFT_MSDOS = 0x01,
+ HVGUESTOS_MICROSOFT_WINDOWS3X = 0x02,
+ HVGUESTOS_MICROSOFT_WINDOWS9X = 0x03,
+ HVGUESTOS_MICROSOFT_WINDOWSNT = 0x04,
+ HVGUESTOS_MICROSOFT_WINDOWSCE = 0x05
+};
+
+/*
+ * Declare the MSR used to identify the guest OS.
+ */
+#define HV_X64_MSR_GUEST_OS_ID 0x40000000
+
+union hv_x64_msr_guest_os_id_contents {
+ u64 as_uint64;
+ struct {
+ u64 build_number:16;
+ u64 service_version:8; /* Service Pack, etc. */
+ u64 minor_version:8;
+ u64 major_version:8;
+ u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
+ u64 vendor_id:16; /* enum hv_guest_os_vendor */
+ };
+};
+
+/*
+ * Declare the MSR used to setup pages used to communicate with the hypervisor.
+ */
+#define HV_X64_MSR_HYPERCALL 0x40000001
+
+union hv_x64_msr_hypercall_contents {
+ u64 as_uint64;
+ struct {
+ u64 enable:1;
+ u64 reserved:11;
+ u64 guest_physical_address:52;
+ };
+};
+
+
+enum {
+ VMBUS_MESSAGE_CONNECTION_ID = 1,
+ VMBUS_MESSAGE_PORT_ID = 1,
+ VMBUS_EVENT_CONNECTION_ID = 2,
+ VMBUS_EVENT_PORT_ID = 2,
+ VMBUS_MONITOR_CONNECTION_ID = 3,
+ VMBUS_MONITOR_PORT_ID = 3,
+ VMBUS_MESSAGE_SINT = 2,
+};
+
+/* #defines */
+
+#define HV_PRESENT_BIT 0x80000000
+
+#define HV_LINUX_GUEST_ID_LO 0x00000000
+#define HV_LINUX_GUEST_ID_HI 0xB16B00B5
+#define HV_LINUX_GUEST_ID (((u64)HV_LINUX_GUEST_ID_HI << 32) | \
+ HV_LINUX_GUEST_ID_LO)
+
+#define HV_CPU_POWER_MANAGEMENT (1 << 0)
+#define HV_RECOMMENDATIONS_MAX 4
+
+#define HV_X64_MAX 5
+#define HV_CAPS_MAX 8
+
+
+#define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
+
+
+/* Service definitions */
+
+#define HV_SERVICE_PARENT_PORT (0)
+#define HV_SERVICE_PARENT_CONNECTION (0)
+
+#define HV_SERVICE_CONNECT_RESPONSE_SUCCESS (0)
+#define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER (1)
+#define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE (2)
+#define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
+
+#define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID (1)
+#define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID (2)
+#define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID (3)
+#define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID (4)
+#define HV_SERVICE_MAX_MESSAGE_ID (4)
+
+#define HV_SERVICE_PROTOCOL_VERSION (0x0010)
+#define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
+
+/* #define VMBUS_REVISION_NUMBER 6 */
+
+/* Our local vmbus's port and connection id. Anything >0 is fine */
+/* #define VMBUS_PORT_ID 11 */
+
+/* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
+static const uuid_le VMBUS_SERVICE_ID = {
+ .b = {
+ 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
+ 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
+ },
+};
+
+
+
+struct hv_input_signal_event_buffer {
+ u64 align8;
+ struct hv_input_signal_event event;
+};
+
+struct hv_context {
+ /* We only support running on top of Hyper-V
+ * So at this point this really can only contain the Hyper-V ID
+ */
+ u64 guestid;
+
+ void *hypercall_page;
+
+ bool synic_initialized;
+
+ /*
+ * This is used as an input param to HvCallSignalEvent hypercall. The
+ * input param is immutable in our usage and must be dynamic mem (vs
+ * stack or global). */
+ struct hv_input_signal_event_buffer *signal_event_buffer;
+ /* 8-bytes aligned of the buffer above */
+ struct hv_input_signal_event *signal_event_param;
+
+ void *synic_message_page[NR_CPUS];
+ void *synic_event_page[NR_CPUS];
+};
+
+extern struct hv_context hv_context;
+
+
+/* Hv Interface */
+
+extern int hv_init(void);
+
+extern void hv_cleanup(void);
+
+extern u16 hv_post_message(union hv_connection_id connection_id,
+ enum hv_message_type message_type,
+ void *payload, size_t payload_size);
+
+extern u16 hv_signal_event(void);
+
+extern void hv_synic_init(void *irqarg);
+
+extern void hv_synic_cleanup(void *arg);
+
+
+/* Interface */
+
+
+int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
+ u32 buflen);
+
+void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
+
+int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
+ struct scatterlist *sglist,
+ u32 sgcount);
+
+int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
+ u32 buflen);
+
+int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
+ void *buffer,
+ u32 buflen,
+ u32 offset);
+
+u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *ring_info);
+
+void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
+ struct hv_ring_buffer_debug_info *debug_info);
+
+/*
+ * Maximum channels is determined by the size of the interrupt page
+ * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
+ * and the other is receive endpoint interrupt
+ */
+#define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
+
+/* The value here must be in multiple of 32 */
+/* TODO: Need to make this configurable */
+#define MAX_NUM_CHANNELS_SUPPORTED 256
+
+
+enum vmbus_connect_state {
+ DISCONNECTED,
+ CONNECTING,
+ CONNECTED,
+ DISCONNECTING
+};
+
+#define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
+
+struct vmbus_connection {
+ enum vmbus_connect_state conn_state;
+
+ atomic_t next_gpadl_handle;
+
+ /*
+ * Represents channel interrupts. Each bit position represents a
+ * channel. When a channel sends an interrupt via VMBUS, it finds its
+ * bit in the sendInterruptPage, set it and calls Hv to generate a port
+ * event. The other end receives the port event and parse the
+ * recvInterruptPage to see which bit is set
+ */
+ void *int_page;
+ void *send_int_page;
+ void *recv_int_page;
+
+ /*
+ * 2 pages - 1st page for parent->child notification and 2nd
+ * is child->parent notification
+ */
+ void *monitor_pages;
+ struct list_head chn_msg_list;
+ spinlock_t channelmsg_lock;
+
+ /* List of channels */
+ struct list_head chn_list;
+ spinlock_t channel_lock;
+
+ struct workqueue_struct *work_queue;
+};
+
+
+struct vmbus_msginfo {
+ /* Bookkeeping stuff */
+ struct list_head msglist_entry;
+
+ /* The message itself */
+ unsigned char msg[0];
+};
+
+
+extern struct vmbus_connection vmbus_connection;
+
+/* General vmbus interface */
+
+struct hv_device *vmbus_device_create(uuid_le *type,
+ uuid_le *instance,
+ struct vmbus_channel *channel);
+
+int vmbus_device_register(struct hv_device *child_device_obj);
+void vmbus_device_unregister(struct hv_device *device_obj);
+
+/* static void */
+/* VmbusChildDeviceDestroy( */
+/* struct hv_device *); */
+
+struct vmbus_channel *relid2channel(u32 relid);
+
+void vmbus_free_channels(void);
+
+/* Connection interface */
+
+int vmbus_connect(void);
+
+int vmbus_post_msg(void *buffer, size_t buflen);
+
+int vmbus_set_event(u32 child_relid);
+
+void vmbus_on_event(unsigned long data);
+
+
+#endif /* _HYPERV_VMBUS_H */
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/ring_buffer.c b/ap/os/linux/linux-3.4.x/drivers/hv/ring_buffer.c
new file mode 100644
index 0000000..d01edf3
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/ring_buffer.c
@@ -0,0 +1,496 @@
+/*
+ *
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ * K. Y. Srinivasan <kys@microsoft.com>
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/hyperv.h>
+
+#include "hyperv_vmbus.h"
+
+
+/* #defines */
+
+
+/* Amount of space to write to */
+#define BYTES_AVAIL_TO_WRITE(r, w, z) \
+ ((w) >= (r)) ? ((z) - ((w) - (r))) : ((r) - (w))
+
+
+/*
+ *
+ * hv_get_ringbuffer_availbytes()
+ *
+ * Get number of bytes available to read and to write to
+ * for the specified ring buffer
+ */
+static inline void
+hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
+ u32 *read, u32 *write)
+{
+ u32 read_loc, write_loc;
+
+ smp_read_barrier_depends();
+
+ /* Capture the read/write indices before they changed */
+ read_loc = rbi->ring_buffer->read_index;
+ write_loc = rbi->ring_buffer->write_index;
+
+ *write = BYTES_AVAIL_TO_WRITE(read_loc, write_loc, rbi->ring_datasize);
+ *read = rbi->ring_datasize - *write;
+}
+
+/*
+ * hv_get_next_write_location()
+ *
+ * Get the next write location for the specified ring buffer
+ *
+ */
+static inline u32
+hv_get_next_write_location(struct hv_ring_buffer_info *ring_info)
+{
+ u32 next = ring_info->ring_buffer->write_index;
+
+ return next;
+}
+
+/*
+ * hv_set_next_write_location()
+ *
+ * Set the next write location for the specified ring buffer
+ *
+ */
+static inline void
+hv_set_next_write_location(struct hv_ring_buffer_info *ring_info,
+ u32 next_write_location)
+{
+ ring_info->ring_buffer->write_index = next_write_location;
+}
+
+/*
+ * hv_get_next_read_location()
+ *
+ * Get the next read location for the specified ring buffer
+ */
+static inline u32
+hv_get_next_read_location(struct hv_ring_buffer_info *ring_info)
+{
+ u32 next = ring_info->ring_buffer->read_index;
+
+ return next;
+}
+
+/*
+ * hv_get_next_readlocation_withoffset()
+ *
+ * Get the next read location + offset for the specified ring buffer.
+ * This allows the caller to skip
+ */
+static inline u32
+hv_get_next_readlocation_withoffset(struct hv_ring_buffer_info *ring_info,
+ u32 offset)
+{
+ u32 next = ring_info->ring_buffer->read_index;
+
+ next += offset;
+ next %= ring_info->ring_datasize;
+
+ return next;
+}
+
+/*
+ *
+ * hv_set_next_read_location()
+ *
+ * Set the next read location for the specified ring buffer
+ *
+ */
+static inline void
+hv_set_next_read_location(struct hv_ring_buffer_info *ring_info,
+ u32 next_read_location)
+{
+ ring_info->ring_buffer->read_index = next_read_location;
+}
+
+
+/*
+ *
+ * hv_get_ring_buffer()
+ *
+ * Get the start of the ring buffer
+ */
+static inline void *
+hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
+{
+ return (void *)ring_info->ring_buffer->buffer;
+}
+
+
+/*
+ *
+ * hv_get_ring_buffersize()
+ *
+ * Get the size of the ring buffer
+ */
+static inline u32
+hv_get_ring_buffersize(struct hv_ring_buffer_info *ring_info)
+{
+ return ring_info->ring_datasize;
+}
+
+/*
+ *
+ * hv_get_ring_bufferindices()
+ *
+ * Get the read and write indices as u64 of the specified ring buffer
+ *
+ */
+static inline u64
+hv_get_ring_bufferindices(struct hv_ring_buffer_info *ring_info)
+{
+ return (u64)ring_info->ring_buffer->write_index << 32;
+}
+
+/*
+ *
+ * hv_copyfrom_ringbuffer()
+ *
+ * Helper routine to copy to source from ring buffer.
+ * Assume there is enough room. Handles wrap-around in src case only!!
+ *
+ */
+static u32 hv_copyfrom_ringbuffer(
+ struct hv_ring_buffer_info *ring_info,
+ void *dest,
+ u32 destlen,
+ u32 start_read_offset)
+{
+ void *ring_buffer = hv_get_ring_buffer(ring_info);
+ u32 ring_buffer_size = hv_get_ring_buffersize(ring_info);
+
+ u32 frag_len;
+
+ /* wrap-around detected at the src */
+ if (destlen > ring_buffer_size - start_read_offset) {
+ frag_len = ring_buffer_size - start_read_offset;
+
+ memcpy(dest, ring_buffer + start_read_offset, frag_len);
+ memcpy(dest + frag_len, ring_buffer, destlen - frag_len);
+ } else
+
+ memcpy(dest, ring_buffer + start_read_offset, destlen);
+
+
+ start_read_offset += destlen;
+ start_read_offset %= ring_buffer_size;
+
+ return start_read_offset;
+}
+
+
+/*
+ *
+ * hv_copyto_ringbuffer()
+ *
+ * Helper routine to copy from source to ring buffer.
+ * Assume there is enough room. Handles wrap-around in dest case only!!
+ *
+ */
+static u32 hv_copyto_ringbuffer(
+ struct hv_ring_buffer_info *ring_info,
+ u32 start_write_offset,
+ void *src,
+ u32 srclen)
+{
+ void *ring_buffer = hv_get_ring_buffer(ring_info);
+ u32 ring_buffer_size = hv_get_ring_buffersize(ring_info);
+ u32 frag_len;
+
+ /* wrap-around detected! */
+ if (srclen > ring_buffer_size - start_write_offset) {
+ frag_len = ring_buffer_size - start_write_offset;
+ memcpy(ring_buffer + start_write_offset, src, frag_len);
+ memcpy(ring_buffer, src + frag_len, srclen - frag_len);
+ } else
+ memcpy(ring_buffer + start_write_offset, src, srclen);
+
+ start_write_offset += srclen;
+ start_write_offset %= ring_buffer_size;
+
+ return start_write_offset;
+}
+
+/*
+ *
+ * hv_ringbuffer_get_debuginfo()
+ *
+ * Get various debug metrics for the specified ring buffer
+ *
+ */
+void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
+ struct hv_ring_buffer_debug_info *debug_info)
+{
+ u32 bytes_avail_towrite;
+ u32 bytes_avail_toread;
+
+ if (ring_info->ring_buffer) {
+ hv_get_ringbuffer_availbytes(ring_info,
+ &bytes_avail_toread,
+ &bytes_avail_towrite);
+
+ debug_info->bytes_avail_toread = bytes_avail_toread;
+ debug_info->bytes_avail_towrite = bytes_avail_towrite;
+ debug_info->current_read_index =
+ ring_info->ring_buffer->read_index;
+ debug_info->current_write_index =
+ ring_info->ring_buffer->write_index;
+ debug_info->current_interrupt_mask =
+ ring_info->ring_buffer->interrupt_mask;
+ }
+}
+
+
+/*
+ *
+ * hv_get_ringbuffer_interrupt_mask()
+ *
+ * Get the interrupt mask for the specified ring buffer
+ *
+ */
+u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *rbi)
+{
+ return rbi->ring_buffer->interrupt_mask;
+}
+
+/*
+ *
+ * hv_ringbuffer_init()
+ *
+ *Initialize the ring buffer
+ *
+ */
+int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
+ void *buffer, u32 buflen)
+{
+ if (sizeof(struct hv_ring_buffer) != PAGE_SIZE)
+ return -EINVAL;
+
+ memset(ring_info, 0, sizeof(struct hv_ring_buffer_info));
+
+ ring_info->ring_buffer = (struct hv_ring_buffer *)buffer;
+ ring_info->ring_buffer->read_index =
+ ring_info->ring_buffer->write_index = 0;
+
+ ring_info->ring_size = buflen;
+ ring_info->ring_datasize = buflen - sizeof(struct hv_ring_buffer);
+
+ spin_lock_init(&ring_info->ring_lock);
+
+ return 0;
+}
+
+/*
+ *
+ * hv_ringbuffer_cleanup()
+ *
+ * Cleanup the ring buffer
+ *
+ */
+void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info)
+{
+}
+
+/*
+ *
+ * hv_ringbuffer_write()
+ *
+ * Write to the ring buffer
+ *
+ */
+int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info,
+ struct scatterlist *sglist, u32 sgcount)
+{
+ int i = 0;
+ u32 bytes_avail_towrite;
+ u32 bytes_avail_toread;
+ u32 totalbytes_towrite = 0;
+
+ struct scatterlist *sg;
+ u32 next_write_location;
+ u64 prev_indices = 0;
+ unsigned long flags;
+
+ for_each_sg(sglist, sg, sgcount, i)
+ {
+ totalbytes_towrite += sg->length;
+ }
+
+ totalbytes_towrite += sizeof(u64);
+
+ spin_lock_irqsave(&outring_info->ring_lock, flags);
+
+ hv_get_ringbuffer_availbytes(outring_info,
+ &bytes_avail_toread,
+ &bytes_avail_towrite);
+
+
+ /* If there is only room for the packet, assume it is full. */
+ /* Otherwise, the next time around, we think the ring buffer */
+ /* is empty since the read index == write index */
+ if (bytes_avail_towrite <= totalbytes_towrite) {
+ spin_unlock_irqrestore(&outring_info->ring_lock, flags);
+ return -EAGAIN;
+ }
+
+ /* Write to the ring buffer */
+ next_write_location = hv_get_next_write_location(outring_info);
+
+ for_each_sg(sglist, sg, sgcount, i)
+ {
+ next_write_location = hv_copyto_ringbuffer(outring_info,
+ next_write_location,
+ sg_virt(sg),
+ sg->length);
+ }
+
+ /* Set previous packet start */
+ prev_indices = hv_get_ring_bufferindices(outring_info);
+
+ next_write_location = hv_copyto_ringbuffer(outring_info,
+ next_write_location,
+ &prev_indices,
+ sizeof(u64));
+
+ /* Make sure we flush all writes before updating the writeIndex */
+ wmb();
+
+ /* Now, update the write location */
+ hv_set_next_write_location(outring_info, next_write_location);
+
+
+ spin_unlock_irqrestore(&outring_info->ring_lock, flags);
+ return 0;
+}
+
+
+/*
+ *
+ * hv_ringbuffer_peek()
+ *
+ * Read without advancing the read index
+ *
+ */
+int hv_ringbuffer_peek(struct hv_ring_buffer_info *Inring_info,
+ void *Buffer, u32 buflen)
+{
+ u32 bytes_avail_towrite;
+ u32 bytes_avail_toread;
+ u32 next_read_location = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&Inring_info->ring_lock, flags);
+
+ hv_get_ringbuffer_availbytes(Inring_info,
+ &bytes_avail_toread,
+ &bytes_avail_towrite);
+
+ /* Make sure there is something to read */
+ if (bytes_avail_toread < buflen) {
+
+ spin_unlock_irqrestore(&Inring_info->ring_lock, flags);
+
+ return -EAGAIN;
+ }
+
+ /* Convert to byte offset */
+ next_read_location = hv_get_next_read_location(Inring_info);
+
+ next_read_location = hv_copyfrom_ringbuffer(Inring_info,
+ Buffer,
+ buflen,
+ next_read_location);
+
+ spin_unlock_irqrestore(&Inring_info->ring_lock, flags);
+
+ return 0;
+}
+
+
+/*
+ *
+ * hv_ringbuffer_read()
+ *
+ * Read and advance the read index
+ *
+ */
+int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer,
+ u32 buflen, u32 offset)
+{
+ u32 bytes_avail_towrite;
+ u32 bytes_avail_toread;
+ u32 next_read_location = 0;
+ u64 prev_indices = 0;
+ unsigned long flags;
+
+ if (buflen <= 0)
+ return -EINVAL;
+
+ spin_lock_irqsave(&inring_info->ring_lock, flags);
+
+ hv_get_ringbuffer_availbytes(inring_info,
+ &bytes_avail_toread,
+ &bytes_avail_towrite);
+
+ /* Make sure there is something to read */
+ if (bytes_avail_toread < buflen) {
+ spin_unlock_irqrestore(&inring_info->ring_lock, flags);
+
+ return -EAGAIN;
+ }
+
+ next_read_location =
+ hv_get_next_readlocation_withoffset(inring_info, offset);
+
+ next_read_location = hv_copyfrom_ringbuffer(inring_info,
+ buffer,
+ buflen,
+ next_read_location);
+
+ next_read_location = hv_copyfrom_ringbuffer(inring_info,
+ &prev_indices,
+ sizeof(u64),
+ next_read_location);
+
+ /* Make sure all reads are done before we update the read index since */
+ /* the writer may start writing to the read area once the read index */
+ /*is updated */
+ mb();
+
+ /* Update the read index */
+ hv_set_next_read_location(inring_info, next_read_location);
+
+ spin_unlock_irqrestore(&inring_info->ring_lock, flags);
+
+ return 0;
+}
diff --git a/ap/os/linux/linux-3.4.x/drivers/hv/vmbus_drv.c b/ap/os/linux/linux-3.4.x/drivers/hv/vmbus_drv.c
new file mode 100644
index 0000000..1ec309d
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hv/vmbus_drv.c
@@ -0,0 +1,810 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ * K. Y. Srinivasan <kys@microsoft.com>
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/sysctl.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
+#include <linux/completion.h>
+#include <linux/hyperv.h>
+#include <asm/hyperv.h>
+#include "hyperv_vmbus.h"
+
+
+static struct acpi_device *hv_acpi_dev;
+
+static struct tasklet_struct msg_dpc;
+static struct tasklet_struct event_dpc;
+static struct completion probe_event;
+static int irq;
+
+struct hv_device_info {
+ u32 chn_id;
+ u32 chn_state;
+ uuid_le chn_type;
+ uuid_le chn_instance;
+
+ u32 monitor_id;
+ u32 server_monitor_pending;
+ u32 server_monitor_latency;
+ u32 server_monitor_conn_id;
+ u32 client_monitor_pending;
+ u32 client_monitor_latency;
+ u32 client_monitor_conn_id;
+
+ struct hv_dev_port_info inbound;
+ struct hv_dev_port_info outbound;
+};
+
+static int vmbus_exists(void)
+{
+ if (hv_acpi_dev == NULL)
+ return -ENODEV;
+
+ return 0;
+}
+
+
+static void get_channel_info(struct hv_device *device,
+ struct hv_device_info *info)
+{
+ struct vmbus_channel_debug_info debug_info;
+
+ if (!device->channel)
+ return;
+
+ vmbus_get_debug_info(device->channel, &debug_info);
+
+ info->chn_id = debug_info.relid;
+ info->chn_state = debug_info.state;
+ memcpy(&info->chn_type, &debug_info.interfacetype,
+ sizeof(uuid_le));
+ memcpy(&info->chn_instance, &debug_info.interface_instance,
+ sizeof(uuid_le));
+
+ info->monitor_id = debug_info.monitorid;
+
+ info->server_monitor_pending = debug_info.servermonitor_pending;
+ info->server_monitor_latency = debug_info.servermonitor_latency;
+ info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
+
+ info->client_monitor_pending = debug_info.clientmonitor_pending;
+ info->client_monitor_latency = debug_info.clientmonitor_latency;
+ info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
+
+ info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
+ info->inbound.read_idx = debug_info.inbound.current_read_index;
+ info->inbound.write_idx = debug_info.inbound.current_write_index;
+ info->inbound.bytes_avail_toread =
+ debug_info.inbound.bytes_avail_toread;
+ info->inbound.bytes_avail_towrite =
+ debug_info.inbound.bytes_avail_towrite;
+
+ info->outbound.int_mask =
+ debug_info.outbound.current_interrupt_mask;
+ info->outbound.read_idx = debug_info.outbound.current_read_index;
+ info->outbound.write_idx = debug_info.outbound.current_write_index;
+ info->outbound.bytes_avail_toread =
+ debug_info.outbound.bytes_avail_toread;
+ info->outbound.bytes_avail_towrite =
+ debug_info.outbound.bytes_avail_towrite;
+}
+
+#define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2)
+static void print_alias_name(struct hv_device *hv_dev, char *alias_name)
+{
+ int i;
+ for (i = 0; i < VMBUS_ALIAS_LEN; i += 2)
+ sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
+}
+
+/*
+ * vmbus_show_device_attr - Show the device attribute in sysfs.
+ *
+ * This is invoked when user does a
+ * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
+ */
+static ssize_t vmbus_show_device_attr(struct device *dev,
+ struct device_attribute *dev_attr,
+ char *buf)
+{
+ struct hv_device *hv_dev = device_to_hv_device(dev);
+ struct hv_device_info *device_info;
+ char alias_name[VMBUS_ALIAS_LEN + 1];
+ int ret = 0;
+
+ device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL);
+ if (!device_info)
+ return ret;
+
+ get_channel_info(hv_dev, device_info);
+
+ if (!strcmp(dev_attr->attr.name, "class_id")) {
+ ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
+ "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
+ device_info->chn_type.b[3],
+ device_info->chn_type.b[2],
+ device_info->chn_type.b[1],
+ device_info->chn_type.b[0],
+ device_info->chn_type.b[5],
+ device_info->chn_type.b[4],
+ device_info->chn_type.b[7],
+ device_info->chn_type.b[6],
+ device_info->chn_type.b[8],
+ device_info->chn_type.b[9],
+ device_info->chn_type.b[10],
+ device_info->chn_type.b[11],
+ device_info->chn_type.b[12],
+ device_info->chn_type.b[13],
+ device_info->chn_type.b[14],
+ device_info->chn_type.b[15]);
+ } else if (!strcmp(dev_attr->attr.name, "device_id")) {
+ ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
+ "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
+ device_info->chn_instance.b[3],
+ device_info->chn_instance.b[2],
+ device_info->chn_instance.b[1],
+ device_info->chn_instance.b[0],
+ device_info->chn_instance.b[5],
+ device_info->chn_instance.b[4],
+ device_info->chn_instance.b[7],
+ device_info->chn_instance.b[6],
+ device_info->chn_instance.b[8],
+ device_info->chn_instance.b[9],
+ device_info->chn_instance.b[10],
+ device_info->chn_instance.b[11],
+ device_info->chn_instance.b[12],
+ device_info->chn_instance.b[13],
+ device_info->chn_instance.b[14],
+ device_info->chn_instance.b[15]);
+ } else if (!strcmp(dev_attr->attr.name, "modalias")) {
+ print_alias_name(hv_dev, alias_name);
+ ret = sprintf(buf, "vmbus:%s\n", alias_name);
+ } else if (!strcmp(dev_attr->attr.name, "state")) {
+ ret = sprintf(buf, "%d\n", device_info->chn_state);
+ } else if (!strcmp(dev_attr->attr.name, "id")) {
+ ret = sprintf(buf, "%d\n", device_info->chn_id);
+ } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
+ ret = sprintf(buf, "%d\n", device_info->outbound.int_mask);
+ } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
+ ret = sprintf(buf, "%d\n", device_info->outbound.read_idx);
+ } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
+ ret = sprintf(buf, "%d\n", device_info->outbound.write_idx);
+ } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
+ ret = sprintf(buf, "%d\n",
+ device_info->outbound.bytes_avail_toread);
+ } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
+ ret = sprintf(buf, "%d\n",
+ device_info->outbound.bytes_avail_towrite);
+ } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
+ ret = sprintf(buf, "%d\n", device_info->inbound.int_mask);
+ } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
+ ret = sprintf(buf, "%d\n", device_info->inbound.read_idx);
+ } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
+ ret = sprintf(buf, "%d\n", device_info->inbound.write_idx);
+ } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
+ ret = sprintf(buf, "%d\n",
+ device_info->inbound.bytes_avail_toread);
+ } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
+ ret = sprintf(buf, "%d\n",
+ device_info->inbound.bytes_avail_towrite);
+ } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
+ ret = sprintf(buf, "%d\n", device_info->monitor_id);
+ } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
+ ret = sprintf(buf, "%d\n", device_info->server_monitor_pending);
+ } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
+ ret = sprintf(buf, "%d\n", device_info->server_monitor_latency);
+ } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
+ ret = sprintf(buf, "%d\n",
+ device_info->server_monitor_conn_id);
+ } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
+ ret = sprintf(buf, "%d\n", device_info->client_monitor_pending);
+ } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
+ ret = sprintf(buf, "%d\n", device_info->client_monitor_latency);
+ } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
+ ret = sprintf(buf, "%d\n",
+ device_info->client_monitor_conn_id);
+ }
+
+ kfree(device_info);
+ return ret;
+}
+
+/* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
+static struct device_attribute vmbus_device_attrs[] = {
+ __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL),
+
+ __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
+
+ __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
+
+ __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
+
+ __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
+ __ATTR_NULL
+};
+
+
+/*
+ * vmbus_uevent - add uevent for our device
+ *
+ * This routine is invoked when a device is added or removed on the vmbus to
+ * generate a uevent to udev in the userspace. The udev will then look at its
+ * rule and the uevent generated here to load the appropriate driver
+ *
+ * The alias string will be of the form vmbus:guid where guid is the string
+ * representation of the device guid (each byte of the guid will be
+ * represented with two hex characters.
+ */
+static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
+{
+ struct hv_device *dev = device_to_hv_device(device);
+ int ret;
+ char alias_name[VMBUS_ALIAS_LEN + 1];
+
+ print_alias_name(dev, alias_name);
+ ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name);
+ return ret;
+}
+
+static uuid_le null_guid;
+
+static inline bool is_null_guid(const __u8 *guid)
+{
+ if (memcmp(guid, &null_guid, sizeof(uuid_le)))
+ return false;
+ return true;
+}
+
+/*
+ * Return a matching hv_vmbus_device_id pointer.
+ * If there is no match, return NULL.
+ */
+static const struct hv_vmbus_device_id *hv_vmbus_get_id(
+ const struct hv_vmbus_device_id *id,
+ __u8 *guid)
+{
+ for (; !is_null_guid(id->guid); id++)
+ if (!memcmp(&id->guid, guid, sizeof(uuid_le)))
+ return id;
+
+ return NULL;
+}
+
+
+
+/*
+ * vmbus_match - Attempt to match the specified device to the specified driver
+ */
+static int vmbus_match(struct device *device, struct device_driver *driver)
+{
+ struct hv_driver *drv = drv_to_hv_drv(driver);
+ struct hv_device *hv_dev = device_to_hv_device(device);
+
+ if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b))
+ return 1;
+
+ return 0;
+}
+
+/*
+ * vmbus_probe - Add the new vmbus's child device
+ */
+static int vmbus_probe(struct device *child_device)
+{
+ int ret = 0;
+ struct hv_driver *drv =
+ drv_to_hv_drv(child_device->driver);
+ struct hv_device *dev = device_to_hv_device(child_device);
+ const struct hv_vmbus_device_id *dev_id;
+
+ dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b);
+ if (drv->probe) {
+ ret = drv->probe(dev, dev_id);
+ if (ret != 0)
+ pr_err("probe failed for device %s (%d)\n",
+ dev_name(child_device), ret);
+
+ } else {
+ pr_err("probe not set for driver %s\n",
+ dev_name(child_device));
+ ret = -ENODEV;
+ }
+ return ret;
+}
+
+/*
+ * vmbus_remove - Remove a vmbus device
+ */
+static int vmbus_remove(struct device *child_device)
+{
+ struct hv_driver *drv = drv_to_hv_drv(child_device->driver);
+ struct hv_device *dev = device_to_hv_device(child_device);
+
+ if (drv->remove)
+ drv->remove(dev);
+ else
+ pr_err("remove not set for driver %s\n",
+ dev_name(child_device));
+
+ return 0;
+}
+
+
+/*
+ * vmbus_shutdown - Shutdown a vmbus device
+ */
+static void vmbus_shutdown(struct device *child_device)
+{
+ struct hv_driver *drv;
+ struct hv_device *dev = device_to_hv_device(child_device);
+
+
+ /* The device may not be attached yet */
+ if (!child_device->driver)
+ return;
+
+ drv = drv_to_hv_drv(child_device->driver);
+
+ if (drv->shutdown)
+ drv->shutdown(dev);
+
+ return;
+}
+
+
+/*
+ * vmbus_device_release - Final callback release of the vmbus child device
+ */
+static void vmbus_device_release(struct device *device)
+{
+ struct hv_device *hv_dev = device_to_hv_device(device);
+
+ kfree(hv_dev);
+
+}
+
+/* The one and only one */
+static struct bus_type hv_bus = {
+ .name = "vmbus",
+ .match = vmbus_match,
+ .shutdown = vmbus_shutdown,
+ .remove = vmbus_remove,
+ .probe = vmbus_probe,
+ .uevent = vmbus_uevent,
+ .dev_attrs = vmbus_device_attrs,
+};
+
+static const char *driver_name = "hyperv";
+
+
+struct onmessage_work_context {
+ struct work_struct work;
+ struct hv_message msg;
+};
+
+static void vmbus_onmessage_work(struct work_struct *work)
+{
+ struct onmessage_work_context *ctx;
+
+ ctx = container_of(work, struct onmessage_work_context,
+ work);
+ vmbus_onmessage(&ctx->msg);
+ kfree(ctx);
+}
+
+static void vmbus_on_msg_dpc(unsigned long data)
+{
+ int cpu = smp_processor_id();
+ void *page_addr = hv_context.synic_message_page[cpu];
+ struct hv_message *msg = (struct hv_message *)page_addr +
+ VMBUS_MESSAGE_SINT;
+ struct onmessage_work_context *ctx;
+
+ while (1) {
+ if (msg->header.message_type == HVMSG_NONE) {
+ /* no msg */
+ break;
+ } else {
+ ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
+ if (ctx == NULL)
+ continue;
+ INIT_WORK(&ctx->work, vmbus_onmessage_work);
+ memcpy(&ctx->msg, msg, sizeof(*msg));
+ queue_work(vmbus_connection.work_queue, &ctx->work);
+ }
+
+ msg->header.message_type = HVMSG_NONE;
+
+ /*
+ * Make sure the write to MessageType (ie set to
+ * HVMSG_NONE) happens before we read the
+ * MessagePending and EOMing. Otherwise, the EOMing
+ * will not deliver any more messages since there is
+ * no empty slot
+ */
+ mb();
+
+ if (msg->header.message_flags.msg_pending) {
+ /*
+ * This will cause message queue rescan to
+ * possibly deliver another msg from the
+ * hypervisor
+ */
+ wrmsrl(HV_X64_MSR_EOM, 0);
+ }
+ }
+}
+
+static irqreturn_t vmbus_isr(int irq, void *dev_id)
+{
+ int cpu = smp_processor_id();
+ void *page_addr;
+ struct hv_message *msg;
+ union hv_synic_event_flags *event;
+ bool handled = false;
+
+ /*
+ * Check for events before checking for messages. This is the order
+ * in which events and messages are checked in Windows guests on
+ * Hyper-V, and the Windows team suggested we do the same.
+ */
+
+ page_addr = hv_context.synic_event_page[cpu];
+ event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
+
+ /* Since we are a child, we only need to check bit 0 */
+ if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) {
+ handled = true;
+ tasklet_schedule(&event_dpc);
+ }
+
+ page_addr = hv_context.synic_message_page[cpu];
+ msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
+
+ /* Check if there are actual msgs to be processed */
+ if (msg->header.message_type != HVMSG_NONE) {
+ handled = true;
+ tasklet_schedule(&msg_dpc);
+ }
+
+ if (handled)
+ return IRQ_HANDLED;
+ else
+ return IRQ_NONE;
+}
+
+/*
+ * vmbus_bus_init -Main vmbus driver initialization routine.
+ *
+ * Here, we
+ * - initialize the vmbus driver context
+ * - invoke the vmbus hv main init routine
+ * - get the irq resource
+ * - retrieve the channel offers
+ */
+static int vmbus_bus_init(int irq)
+{
+ int ret;
+ unsigned int vector;
+
+ /* Hypervisor initialization...setup hypercall page..etc */
+ ret = hv_init();
+ if (ret != 0) {
+ pr_err("Unable to initialize the hypervisor - 0x%x\n", ret);
+ return ret;
+ }
+
+ tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0);
+ tasklet_init(&event_dpc, vmbus_on_event, 0);
+
+ ret = bus_register(&hv_bus);
+ if (ret)
+ goto err_cleanup;
+
+ ret = request_irq(irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
+ driver_name, hv_acpi_dev);
+
+ if (ret != 0) {
+ pr_err("Unable to request IRQ %d\n",
+ irq);
+ goto err_unregister;
+ }
+
+ vector = IRQ0_VECTOR + irq;
+
+ /*
+ * Notify the hypervisor of our irq and
+ * connect to the host.
+ */
+ on_each_cpu(hv_synic_init, (void *)&vector, 1);
+ ret = vmbus_connect();
+ if (ret)
+ goto err_irq;
+
+ vmbus_request_offers();
+
+ return 0;
+
+err_irq:
+ free_irq(irq, hv_acpi_dev);
+
+err_unregister:
+ bus_unregister(&hv_bus);
+
+err_cleanup:
+ hv_cleanup();
+
+ return ret;
+}
+
+/**
+ * __vmbus_child_driver_register - Register a vmbus's driver
+ * @drv: Pointer to driver structure you want to register
+ * @owner: owner module of the drv
+ * @mod_name: module name string
+ *
+ * Registers the given driver with Linux through the 'driver_register()' call
+ * and sets up the hyper-v vmbus handling for this driver.
+ * It will return the state of the 'driver_register()' call.
+ *
+ */
+int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name)
+{
+ int ret;
+
+ pr_info("registering driver %s\n", hv_driver->name);
+
+ ret = vmbus_exists();
+ if (ret < 0)
+ return ret;
+
+ hv_driver->driver.name = hv_driver->name;
+ hv_driver->driver.owner = owner;
+ hv_driver->driver.mod_name = mod_name;
+ hv_driver->driver.bus = &hv_bus;
+
+ ret = driver_register(&hv_driver->driver);
+
+ vmbus_request_offers();
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__vmbus_driver_register);
+
+/**
+ * vmbus_driver_unregister() - Unregister a vmbus's driver
+ * @drv: Pointer to driver structure you want to un-register
+ *
+ * Un-register the given driver that was previous registered with a call to
+ * vmbus_driver_register()
+ */
+void vmbus_driver_unregister(struct hv_driver *hv_driver)
+{
+ pr_info("unregistering driver %s\n", hv_driver->name);
+
+ if (!vmbus_exists())
+ driver_unregister(&hv_driver->driver);
+}
+EXPORT_SYMBOL_GPL(vmbus_driver_unregister);
+
+/*
+ * vmbus_device_create - Creates and registers a new child device
+ * on the vmbus.
+ */
+struct hv_device *vmbus_device_create(uuid_le *type,
+ uuid_le *instance,
+ struct vmbus_channel *channel)
+{
+ struct hv_device *child_device_obj;
+
+ child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
+ if (!child_device_obj) {
+ pr_err("Unable to allocate device object for child device\n");
+ return NULL;
+ }
+
+ child_device_obj->channel = channel;
+ memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le));
+ memcpy(&child_device_obj->dev_instance, instance,
+ sizeof(uuid_le));
+
+
+ return child_device_obj;
+}
+
+/*
+ * vmbus_device_register - Register the child device
+ */
+int vmbus_device_register(struct hv_device *child_device_obj)
+{
+ int ret = 0;
+
+ static atomic_t device_num = ATOMIC_INIT(0);
+
+ dev_set_name(&child_device_obj->device, "vmbus_0_%d",
+ atomic_inc_return(&device_num));
+
+ child_device_obj->device.bus = &hv_bus;
+ child_device_obj->device.parent = &hv_acpi_dev->dev;
+ child_device_obj->device.release = vmbus_device_release;
+
+ /*
+ * Register with the LDM. This will kick off the driver/device
+ * binding...which will eventually call vmbus_match() and vmbus_probe()
+ */
+ ret = device_register(&child_device_obj->device);
+
+ if (ret)
+ pr_err("Unable to register child device\n");
+ else
+ pr_debug("child device %s registered\n",
+ dev_name(&child_device_obj->device));
+
+ return ret;
+}
+
+/*
+ * vmbus_device_unregister - Remove the specified child device
+ * from the vmbus.
+ */
+void vmbus_device_unregister(struct hv_device *device_obj)
+{
+ pr_debug("child device %s unregistered\n",
+ dev_name(&device_obj->device));
+
+ /*
+ * Kick off the process of unregistering the device.
+ * This will call vmbus_remove() and eventually vmbus_device_release()
+ */
+ device_unregister(&device_obj->device);
+}
+
+
+/*
+ * VMBUS is an acpi enumerated device. Get the the IRQ information
+ * from DSDT.
+ */
+
+static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq)
+{
+
+ if (res->type == ACPI_RESOURCE_TYPE_IRQ) {
+ struct acpi_resource_irq *irqp;
+ irqp = &res->data.irq;
+
+ *((unsigned int *)irq) = irqp->interrupts[0];
+ }
+
+ return AE_OK;
+}
+
+static int vmbus_acpi_add(struct acpi_device *device)
+{
+ acpi_status result;
+
+ hv_acpi_dev = device;
+
+ result = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
+ vmbus_walk_resources, &irq);
+
+ if (ACPI_FAILURE(result)) {
+ complete(&probe_event);
+ return -ENODEV;
+ }
+ complete(&probe_event);
+ return 0;
+}
+
+static const struct acpi_device_id vmbus_acpi_device_ids[] = {
+ {"VMBUS", 0},
+ {"VMBus", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
+
+static struct acpi_driver vmbus_acpi_driver = {
+ .name = "vmbus",
+ .ids = vmbus_acpi_device_ids,
+ .ops = {
+ .add = vmbus_acpi_add,
+ },
+};
+
+static int __init hv_acpi_init(void)
+{
+ int ret, t;
+
+ init_completion(&probe_event);
+
+ /*
+ * Get irq resources first.
+ */
+
+ ret = acpi_bus_register_driver(&vmbus_acpi_driver);
+
+ if (ret)
+ return ret;
+
+ t = wait_for_completion_timeout(&probe_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (irq <= 0) {
+ ret = -ENODEV;
+ goto cleanup;
+ }
+
+ ret = vmbus_bus_init(irq);
+ if (ret)
+ goto cleanup;
+
+ return 0;
+
+cleanup:
+ acpi_bus_unregister_driver(&vmbus_acpi_driver);
+ hv_acpi_dev = NULL;
+ return ret;
+}
+
+static void __exit vmbus_exit(void)
+{
+
+ free_irq(irq, hv_acpi_dev);
+ vmbus_free_channels();
+ bus_unregister(&hv_bus);
+ hv_cleanup();
+ acpi_bus_unregister_driver(&vmbus_acpi_driver);
+}
+
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(HV_DRV_VERSION);
+
+subsys_initcall(hv_acpi_init);
+module_exit(vmbus_exit);