zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/gpu/vga/vgaarb.c b/ap/os/linux/linux-3.4.x/drivers/gpu/vga/vgaarb.c
new file mode 100644
index 0000000..111d956
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/gpu/vga/vgaarb.c
@@ -0,0 +1,1331 @@
+/*
+ * vgaarb.c: Implements the VGA arbitration. For details refer to
+ * Documentation/vgaarbiter.txt
+ *
+ *
+ * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ * (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
+ * (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/spinlock.h>
+#include <linux/poll.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+
+#include <linux/uaccess.h>
+
+#include <linux/vgaarb.h>
+
+static void vga_arbiter_notify_clients(void);
+/*
+ * We keep a list of all vga devices in the system to speed
+ * up the various operations of the arbiter
+ */
+struct vga_device {
+ struct list_head list;
+ struct pci_dev *pdev;
+ unsigned int decodes; /* what does it decodes */
+ unsigned int owns; /* what does it owns */
+ unsigned int locks; /* what does it locks */
+ unsigned int io_lock_cnt; /* legacy IO lock count */
+ unsigned int mem_lock_cnt; /* legacy MEM lock count */
+ unsigned int io_norm_cnt; /* normal IO count */
+ unsigned int mem_norm_cnt; /* normal MEM count */
+ bool bridge_has_one_vga;
+ /* allow IRQ enable/disable hook */
+ void *cookie;
+ void (*irq_set_state)(void *cookie, bool enable);
+ unsigned int (*set_vga_decode)(void *cookie, bool decode);
+};
+
+static LIST_HEAD(vga_list);
+static int vga_count, vga_decode_count;
+static bool vga_arbiter_used;
+static DEFINE_SPINLOCK(vga_lock);
+static DECLARE_WAIT_QUEUE_HEAD(vga_wait_queue);
+
+
+static const char *vga_iostate_to_str(unsigned int iostate)
+{
+ /* Ignore VGA_RSRC_IO and VGA_RSRC_MEM */
+ iostate &= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+ switch (iostate) {
+ case VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM:
+ return "io+mem";
+ case VGA_RSRC_LEGACY_IO:
+ return "io";
+ case VGA_RSRC_LEGACY_MEM:
+ return "mem";
+ }
+ return "none";
+}
+
+static int vga_str_to_iostate(char *buf, int str_size, int *io_state)
+{
+ /* we could in theory hand out locks on IO and mem
+ * separately to userspace but it can cause deadlocks */
+ if (strncmp(buf, "none", 4) == 0) {
+ *io_state = VGA_RSRC_NONE;
+ return 1;
+ }
+
+ /* XXX We're not chekcing the str_size! */
+ if (strncmp(buf, "io+mem", 6) == 0)
+ goto both;
+ else if (strncmp(buf, "io", 2) == 0)
+ goto both;
+ else if (strncmp(buf, "mem", 3) == 0)
+ goto both;
+ return 0;
+both:
+ *io_state = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+ return 1;
+}
+
+#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
+/* this is only used a cookie - it should not be dereferenced */
+static struct pci_dev *vga_default;
+#endif
+
+static void vga_arb_device_card_gone(struct pci_dev *pdev);
+
+/* Find somebody in our list */
+static struct vga_device *vgadev_find(struct pci_dev *pdev)
+{
+ struct vga_device *vgadev;
+
+ list_for_each_entry(vgadev, &vga_list, list)
+ if (pdev == vgadev->pdev)
+ return vgadev;
+ return NULL;
+}
+
+/* Returns the default VGA device (vgacon's babe) */
+#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
+struct pci_dev *vga_default_device(void)
+{
+ return vga_default;
+}
+#endif
+
+static inline void vga_irq_set_state(struct vga_device *vgadev, bool state)
+{
+ if (vgadev->irq_set_state)
+ vgadev->irq_set_state(vgadev->cookie, state);
+}
+
+
+/* If we don't ever use VGA arb we should avoid
+ turning off anything anywhere due to old X servers getting
+ confused about the boot device not being VGA */
+static void vga_check_first_use(void)
+{
+ /* we should inform all GPUs in the system that
+ * VGA arb has occurred and to try and disable resources
+ * if they can */
+ if (!vga_arbiter_used) {
+ vga_arbiter_used = true;
+ vga_arbiter_notify_clients();
+ }
+}
+
+static struct vga_device *__vga_tryget(struct vga_device *vgadev,
+ unsigned int rsrc)
+{
+ unsigned int wants, legacy_wants, match;
+ struct vga_device *conflict;
+ unsigned int pci_bits;
+ u32 flags = 0;
+
+ /* Account for "normal" resources to lock. If we decode the legacy,
+ * counterpart, we need to request it as well
+ */
+ if ((rsrc & VGA_RSRC_NORMAL_IO) &&
+ (vgadev->decodes & VGA_RSRC_LEGACY_IO))
+ rsrc |= VGA_RSRC_LEGACY_IO;
+ if ((rsrc & VGA_RSRC_NORMAL_MEM) &&
+ (vgadev->decodes & VGA_RSRC_LEGACY_MEM))
+ rsrc |= VGA_RSRC_LEGACY_MEM;
+
+ pr_debug("%s: %d\n", __func__, rsrc);
+ pr_debug("%s: owns: %d\n", __func__, vgadev->owns);
+
+ /* Check what resources we need to acquire */
+ wants = rsrc & ~vgadev->owns;
+
+ /* We already own everything, just mark locked & bye bye */
+ if (wants == 0)
+ goto lock_them;
+
+ /* We don't need to request a legacy resource, we just enable
+ * appropriate decoding and go
+ */
+ legacy_wants = wants & VGA_RSRC_LEGACY_MASK;
+ if (legacy_wants == 0)
+ goto enable_them;
+
+ /* Ok, we don't, let's find out how we need to kick off */
+ list_for_each_entry(conflict, &vga_list, list) {
+ unsigned int lwants = legacy_wants;
+ unsigned int change_bridge = 0;
+
+ /* Don't conflict with myself */
+ if (vgadev == conflict)
+ continue;
+
+ /* Check if the architecture allows a conflict between those
+ * 2 devices or if they are on separate domains
+ */
+ if (!vga_conflicts(vgadev->pdev, conflict->pdev))
+ continue;
+
+ /* We have a possible conflict. before we go further, we must
+ * check if we sit on the same bus as the conflicting device.
+ * if we don't, then we must tie both IO and MEM resources
+ * together since there is only a single bit controlling
+ * VGA forwarding on P2P bridges
+ */
+ if (vgadev->pdev->bus != conflict->pdev->bus) {
+ change_bridge = 1;
+ lwants = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+ }
+
+ /* Check if the guy has a lock on the resource. If he does,
+ * return the conflicting entry
+ */
+ if (conflict->locks & lwants)
+ return conflict;
+
+ /* Ok, now check if he owns the resource we want. We don't need
+ * to check "decodes" since it should be impossible to own
+ * own legacy resources you don't decode unless I have a bug
+ * in this code...
+ */
+ WARN_ON(conflict->owns & ~conflict->decodes);
+ match = lwants & conflict->owns;
+ if (!match)
+ continue;
+
+ /* looks like he doesn't have a lock, we can steal
+ * them from him
+ */
+
+ flags = 0;
+ pci_bits = 0;
+
+ if (!conflict->bridge_has_one_vga) {
+ vga_irq_set_state(conflict, false);
+ flags |= PCI_VGA_STATE_CHANGE_DECODES;
+ if (lwants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
+ pci_bits |= PCI_COMMAND_MEMORY;
+ if (lwants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
+ pci_bits |= PCI_COMMAND_IO;
+ }
+
+ if (change_bridge)
+ flags |= PCI_VGA_STATE_CHANGE_BRIDGE;
+
+ pci_set_vga_state(conflict->pdev, false, pci_bits, flags);
+ conflict->owns &= ~lwants;
+ /* If he also owned non-legacy, that is no longer the case */
+ if (lwants & VGA_RSRC_LEGACY_MEM)
+ conflict->owns &= ~VGA_RSRC_NORMAL_MEM;
+ if (lwants & VGA_RSRC_LEGACY_IO)
+ conflict->owns &= ~VGA_RSRC_NORMAL_IO;
+ }
+
+enable_them:
+ /* ok dude, we got it, everybody conflicting has been disabled, let's
+ * enable us. Make sure we don't mark a bit in "owns" that we don't
+ * also have in "decodes". We can lock resources we don't decode but
+ * not own them.
+ */
+ flags = 0;
+ pci_bits = 0;
+
+ if (!vgadev->bridge_has_one_vga) {
+ flags |= PCI_VGA_STATE_CHANGE_DECODES;
+ if (wants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
+ pci_bits |= PCI_COMMAND_MEMORY;
+ if (wants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
+ pci_bits |= PCI_COMMAND_IO;
+ }
+ if (!!(wants & VGA_RSRC_LEGACY_MASK))
+ flags |= PCI_VGA_STATE_CHANGE_BRIDGE;
+
+ pci_set_vga_state(vgadev->pdev, true, pci_bits, flags);
+
+ if (!vgadev->bridge_has_one_vga) {
+ vga_irq_set_state(vgadev, true);
+ }
+ vgadev->owns |= (wants & vgadev->decodes);
+lock_them:
+ vgadev->locks |= (rsrc & VGA_RSRC_LEGACY_MASK);
+ if (rsrc & VGA_RSRC_LEGACY_IO)
+ vgadev->io_lock_cnt++;
+ if (rsrc & VGA_RSRC_LEGACY_MEM)
+ vgadev->mem_lock_cnt++;
+ if (rsrc & VGA_RSRC_NORMAL_IO)
+ vgadev->io_norm_cnt++;
+ if (rsrc & VGA_RSRC_NORMAL_MEM)
+ vgadev->mem_norm_cnt++;
+
+ return NULL;
+}
+
+static void __vga_put(struct vga_device *vgadev, unsigned int rsrc)
+{
+ unsigned int old_locks = vgadev->locks;
+
+ pr_debug("%s\n", __func__);
+
+ /* Update our counters, and account for equivalent legacy resources
+ * if we decode them
+ */
+ if ((rsrc & VGA_RSRC_NORMAL_IO) && vgadev->io_norm_cnt > 0) {
+ vgadev->io_norm_cnt--;
+ if (vgadev->decodes & VGA_RSRC_LEGACY_IO)
+ rsrc |= VGA_RSRC_LEGACY_IO;
+ }
+ if ((rsrc & VGA_RSRC_NORMAL_MEM) && vgadev->mem_norm_cnt > 0) {
+ vgadev->mem_norm_cnt--;
+ if (vgadev->decodes & VGA_RSRC_LEGACY_MEM)
+ rsrc |= VGA_RSRC_LEGACY_MEM;
+ }
+ if ((rsrc & VGA_RSRC_LEGACY_IO) && vgadev->io_lock_cnt > 0)
+ vgadev->io_lock_cnt--;
+ if ((rsrc & VGA_RSRC_LEGACY_MEM) && vgadev->mem_lock_cnt > 0)
+ vgadev->mem_lock_cnt--;
+
+ /* Just clear lock bits, we do lazy operations so we don't really
+ * have to bother about anything else at this point
+ */
+ if (vgadev->io_lock_cnt == 0)
+ vgadev->locks &= ~VGA_RSRC_LEGACY_IO;
+ if (vgadev->mem_lock_cnt == 0)
+ vgadev->locks &= ~VGA_RSRC_LEGACY_MEM;
+
+ /* Kick the wait queue in case somebody was waiting if we actually
+ * released something
+ */
+ if (old_locks != vgadev->locks)
+ wake_up_all(&vga_wait_queue);
+}
+
+int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
+{
+ struct vga_device *vgadev, *conflict;
+ unsigned long flags;
+ wait_queue_t wait;
+ int rc = 0;
+
+ vga_check_first_use();
+ /* The one who calls us should check for this, but lets be sure... */
+ if (pdev == NULL)
+ pdev = vga_default_device();
+ if (pdev == NULL)
+ return 0;
+
+ for (;;) {
+ spin_lock_irqsave(&vga_lock, flags);
+ vgadev = vgadev_find(pdev);
+ if (vgadev == NULL) {
+ spin_unlock_irqrestore(&vga_lock, flags);
+ rc = -ENODEV;
+ break;
+ }
+ conflict = __vga_tryget(vgadev, rsrc);
+ spin_unlock_irqrestore(&vga_lock, flags);
+ if (conflict == NULL)
+ break;
+
+
+ /* We have a conflict, we wait until somebody kicks the
+ * work queue. Currently we have one work queue that we
+ * kick each time some resources are released, but it would
+ * be fairly easy to have a per device one so that we only
+ * need to attach to the conflicting device
+ */
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&vga_wait_queue, &wait);
+ set_current_state(interruptible ?
+ TASK_INTERRUPTIBLE :
+ TASK_UNINTERRUPTIBLE);
+ if (signal_pending(current)) {
+ rc = -EINTR;
+ break;
+ }
+ schedule();
+ remove_wait_queue(&vga_wait_queue, &wait);
+ set_current_state(TASK_RUNNING);
+ }
+ return rc;
+}
+EXPORT_SYMBOL(vga_get);
+
+int vga_tryget(struct pci_dev *pdev, unsigned int rsrc)
+{
+ struct vga_device *vgadev;
+ unsigned long flags;
+ int rc = 0;
+
+ vga_check_first_use();
+
+ /* The one who calls us should check for this, but lets be sure... */
+ if (pdev == NULL)
+ pdev = vga_default_device();
+ if (pdev == NULL)
+ return 0;
+ spin_lock_irqsave(&vga_lock, flags);
+ vgadev = vgadev_find(pdev);
+ if (vgadev == NULL) {
+ rc = -ENODEV;
+ goto bail;
+ }
+ if (__vga_tryget(vgadev, rsrc))
+ rc = -EBUSY;
+bail:
+ spin_unlock_irqrestore(&vga_lock, flags);
+ return rc;
+}
+EXPORT_SYMBOL(vga_tryget);
+
+void vga_put(struct pci_dev *pdev, unsigned int rsrc)
+{
+ struct vga_device *vgadev;
+ unsigned long flags;
+
+ /* The one who calls us should check for this, but lets be sure... */
+ if (pdev == NULL)
+ pdev = vga_default_device();
+ if (pdev == NULL)
+ return;
+ spin_lock_irqsave(&vga_lock, flags);
+ vgadev = vgadev_find(pdev);
+ if (vgadev == NULL)
+ goto bail;
+ __vga_put(vgadev, rsrc);
+bail:
+ spin_unlock_irqrestore(&vga_lock, flags);
+}
+EXPORT_SYMBOL(vga_put);
+
+/* Rules for using a bridge to control a VGA descendant decoding:
+ if a bridge has only one VGA descendant then it can be used
+ to control the VGA routing for that device.
+ It should always use the bridge closest to the device to control it.
+ If a bridge has a direct VGA descendant, but also have a sub-bridge
+ VGA descendant then we cannot use that bridge to control the direct VGA descendant.
+ So for every device we register, we need to iterate all its parent bridges
+ so we can invalidate any devices using them properly.
+*/
+static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
+{
+ struct vga_device *same_bridge_vgadev;
+ struct pci_bus *new_bus, *bus;
+ struct pci_dev *new_bridge, *bridge;
+
+ vgadev->bridge_has_one_vga = true;
+
+ if (list_empty(&vga_list))
+ return;
+
+ /* okay iterate the new devices bridge hierarachy */
+ new_bus = vgadev->pdev->bus;
+ while (new_bus) {
+ new_bridge = new_bus->self;
+
+ /* go through list of devices already registered */
+ list_for_each_entry(same_bridge_vgadev, &vga_list, list) {
+ bus = same_bridge_vgadev->pdev->bus;
+ bridge = bus->self;
+
+ /* see if the share a bridge with this device */
+ if (new_bridge == bridge) {
+ /* if their direct parent bridge is the same
+ as any bridge of this device then it can't be used
+ for that device */
+ same_bridge_vgadev->bridge_has_one_vga = false;
+ }
+
+ /* now iterate the previous devices bridge hierarchy */
+ /* if the new devices parent bridge is in the other devices
+ hierarchy then we can't use it to control this device */
+ while (bus) {
+ bridge = bus->self;
+ if (bridge) {
+ if (bridge == vgadev->pdev->bus->self)
+ vgadev->bridge_has_one_vga = false;
+ }
+ bus = bus->parent;
+ }
+ }
+ new_bus = new_bus->parent;
+ }
+}
+
+/*
+ * Currently, we assume that the "initial" setup of the system is
+ * not sane, that is we come up with conflicting devices and let
+ * the arbiter's client decides if devices decodes or not legacy
+ * things.
+ */
+static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
+{
+ struct vga_device *vgadev;
+ unsigned long flags;
+ struct pci_bus *bus;
+ struct pci_dev *bridge;
+ u16 cmd;
+
+ /* Only deal with VGA class devices */
+ if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
+ return false;
+
+ /* Allocate structure */
+ vgadev = kmalloc(sizeof(struct vga_device), GFP_KERNEL);
+ if (vgadev == NULL) {
+ pr_err("vgaarb: failed to allocate pci device\n");
+ /* What to do on allocation failure ? For now, let's
+ * just do nothing, I'm not sure there is anything saner
+ * to be done
+ */
+ return false;
+ }
+
+ memset(vgadev, 0, sizeof(*vgadev));
+
+ /* Take lock & check for duplicates */
+ spin_lock_irqsave(&vga_lock, flags);
+ if (vgadev_find(pdev) != NULL) {
+ BUG_ON(1);
+ goto fail;
+ }
+ vgadev->pdev = pdev;
+
+ /* By default, assume we decode everything */
+ vgadev->decodes = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
+ VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+
+ /* by default mark it as decoding */
+ vga_decode_count++;
+ /* Mark that we "own" resources based on our enables, we will
+ * clear that below if the bridge isn't forwarding
+ */
+ pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+ if (cmd & PCI_COMMAND_IO)
+ vgadev->owns |= VGA_RSRC_LEGACY_IO;
+ if (cmd & PCI_COMMAND_MEMORY)
+ vgadev->owns |= VGA_RSRC_LEGACY_MEM;
+
+ /* Check if VGA cycles can get down to us */
+ bus = pdev->bus;
+ while (bus) {
+ bridge = bus->self;
+ if (bridge) {
+ u16 l;
+ pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
+ &l);
+ if (!(l & PCI_BRIDGE_CTL_VGA)) {
+ vgadev->owns = 0;
+ break;
+ }
+ }
+ bus = bus->parent;
+ }
+
+ /* Deal with VGA default device. Use first enabled one
+ * by default if arch doesn't have it's own hook
+ */
+#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
+ if (vga_default == NULL &&
+ ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK))
+ vga_default = pci_dev_get(pdev);
+#endif
+
+ vga_arbiter_check_bridge_sharing(vgadev);
+
+ /* Add to the list */
+ list_add(&vgadev->list, &vga_list);
+ vga_count++;
+ pr_info("vgaarb: device added: PCI:%s,decodes=%s,owns=%s,locks=%s\n",
+ pci_name(pdev),
+ vga_iostate_to_str(vgadev->decodes),
+ vga_iostate_to_str(vgadev->owns),
+ vga_iostate_to_str(vgadev->locks));
+
+ spin_unlock_irqrestore(&vga_lock, flags);
+ return true;
+fail:
+ spin_unlock_irqrestore(&vga_lock, flags);
+ kfree(vgadev);
+ return false;
+}
+
+static bool vga_arbiter_del_pci_device(struct pci_dev *pdev)
+{
+ struct vga_device *vgadev;
+ unsigned long flags;
+ bool ret = true;
+
+ spin_lock_irqsave(&vga_lock, flags);
+ vgadev = vgadev_find(pdev);
+ if (vgadev == NULL) {
+ ret = false;
+ goto bail;
+ }
+
+ if (vga_default == pdev) {
+ pci_dev_put(vga_default);
+ vga_default = NULL;
+ }
+
+ if (vgadev->decodes & (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM))
+ vga_decode_count--;
+
+ /* Remove entry from list */
+ list_del(&vgadev->list);
+ vga_count--;
+ /* Notify userland driver that the device is gone so it discards
+ * it's copies of the pci_dev pointer
+ */
+ vga_arb_device_card_gone(pdev);
+
+ /* Wake up all possible waiters */
+ wake_up_all(&vga_wait_queue);
+bail:
+ spin_unlock_irqrestore(&vga_lock, flags);
+ kfree(vgadev);
+ return ret;
+}
+
+/* this is called with the lock */
+static inline void vga_update_device_decodes(struct vga_device *vgadev,
+ int new_decodes)
+{
+ int old_decodes;
+ struct vga_device *new_vgadev, *conflict;
+
+ old_decodes = vgadev->decodes;
+ vgadev->decodes = new_decodes;
+
+ pr_info("vgaarb: device changed decodes: PCI:%s,olddecodes=%s,decodes=%s:owns=%s\n",
+ pci_name(vgadev->pdev),
+ vga_iostate_to_str(old_decodes),
+ vga_iostate_to_str(vgadev->decodes),
+ vga_iostate_to_str(vgadev->owns));
+
+
+ /* if we own the decodes we should move them along to
+ another card */
+ if ((vgadev->owns & old_decodes) && (vga_count > 1)) {
+ /* set us to own nothing */
+ vgadev->owns &= ~old_decodes;
+ list_for_each_entry(new_vgadev, &vga_list, list) {
+ if ((new_vgadev != vgadev) &&
+ (new_vgadev->decodes & VGA_RSRC_LEGACY_MASK)) {
+ pr_info("vgaarb: transferring owner from PCI:%s to PCI:%s\n", pci_name(vgadev->pdev), pci_name(new_vgadev->pdev));
+ conflict = __vga_tryget(new_vgadev, VGA_RSRC_LEGACY_MASK);
+ if (!conflict)
+ __vga_put(new_vgadev, VGA_RSRC_LEGACY_MASK);
+ break;
+ }
+ }
+ }
+
+ /* change decodes counter */
+ if (old_decodes != new_decodes) {
+ if (new_decodes & (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM))
+ vga_decode_count++;
+ else
+ vga_decode_count--;
+ }
+ pr_debug("vgaarb: decoding count now is: %d\n", vga_decode_count);
+}
+
+static void __vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes, bool userspace)
+{
+ struct vga_device *vgadev;
+ unsigned long flags;
+
+ decodes &= VGA_RSRC_LEGACY_MASK;
+
+ spin_lock_irqsave(&vga_lock, flags);
+ vgadev = vgadev_find(pdev);
+ if (vgadev == NULL)
+ goto bail;
+
+ /* don't let userspace futz with kernel driver decodes */
+ if (userspace && vgadev->set_vga_decode)
+ goto bail;
+
+ /* update the device decodes + counter */
+ vga_update_device_decodes(vgadev, decodes);
+
+ /* XXX if somebody is going from "doesn't decode" to "decodes" state
+ * here, additional care must be taken as we may have pending owner
+ * ship of non-legacy region ...
+ */
+bail:
+ spin_unlock_irqrestore(&vga_lock, flags);
+}
+
+void vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes)
+{
+ __vga_set_legacy_decoding(pdev, decodes, false);
+}
+EXPORT_SYMBOL(vga_set_legacy_decoding);
+
+/* call with NULL to unregister */
+int vga_client_register(struct pci_dev *pdev, void *cookie,
+ void (*irq_set_state)(void *cookie, bool state),
+ unsigned int (*set_vga_decode)(void *cookie, bool decode))
+{
+ int ret = -ENODEV;
+ struct vga_device *vgadev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vga_lock, flags);
+ vgadev = vgadev_find(pdev);
+ if (!vgadev)
+ goto bail;
+
+ vgadev->irq_set_state = irq_set_state;
+ vgadev->set_vga_decode = set_vga_decode;
+ vgadev->cookie = cookie;
+ ret = 0;
+
+bail:
+ spin_unlock_irqrestore(&vga_lock, flags);
+ return ret;
+
+}
+EXPORT_SYMBOL(vga_client_register);
+
+/*
+ * Char driver implementation
+ *
+ * Semantics is:
+ *
+ * open : open user instance of the arbitrer. by default, it's
+ * attached to the default VGA device of the system.
+ *
+ * close : close user instance, release locks
+ *
+ * read : return a string indicating the status of the target.
+ * an IO state string is of the form {io,mem,io+mem,none},
+ * mc and ic are respectively mem and io lock counts (for
+ * debugging/diagnostic only). "decodes" indicate what the
+ * card currently decodes, "owns" indicates what is currently
+ * enabled on it, and "locks" indicates what is locked by this
+ * card. If the card is unplugged, we get "invalid" then for
+ * card_ID and an -ENODEV error is returned for any command
+ * until a new card is targeted
+ *
+ * "<card_ID>,decodes=<io_state>,owns=<io_state>,locks=<io_state> (ic,mc)"
+ *
+ * write : write a command to the arbiter. List of commands is:
+ *
+ * target <card_ID> : switch target to card <card_ID> (see below)
+ * lock <io_state> : acquires locks on target ("none" is invalid io_state)
+ * trylock <io_state> : non-blocking acquire locks on target
+ * unlock <io_state> : release locks on target
+ * unlock all : release all locks on target held by this user
+ * decodes <io_state> : set the legacy decoding attributes for the card
+ *
+ * poll : event if something change on any card (not just the target)
+ *
+ * card_ID is of the form "PCI:domain:bus:dev.fn". It can be set to "default"
+ * to go back to the system default card (TODO: not implemented yet).
+ * Currently, only PCI is supported as a prefix, but the userland API may
+ * support other bus types in the future, even if the current kernel
+ * implementation doesn't.
+ *
+ * Note about locks:
+ *
+ * The driver keeps track of which user has what locks on which card. It
+ * supports stacking, like the kernel one. This complexifies the implementation
+ * a bit, but makes the arbiter more tolerant to userspace problems and able
+ * to properly cleanup in all cases when a process dies.
+ * Currently, a max of 16 cards simultaneously can have locks issued from
+ * userspace for a given user (file descriptor instance) of the arbiter.
+ *
+ * If the device is hot-unplugged, there is a hook inside the module to notify
+ * they being added/removed in the system and automatically added/removed in
+ * the arbiter.
+ */
+
+#define MAX_USER_CARDS CONFIG_VGA_ARB_MAX_GPUS
+#define PCI_INVALID_CARD ((struct pci_dev *)-1UL)
+
+/*
+ * Each user has an array of these, tracking which cards have locks
+ */
+struct vga_arb_user_card {
+ struct pci_dev *pdev;
+ unsigned int mem_cnt;
+ unsigned int io_cnt;
+};
+
+struct vga_arb_private {
+ struct list_head list;
+ struct pci_dev *target;
+ struct vga_arb_user_card cards[MAX_USER_CARDS];
+ spinlock_t lock;
+};
+
+static LIST_HEAD(vga_user_list);
+static DEFINE_SPINLOCK(vga_user_lock);
+
+
+/*
+ * This function gets a string in the format: "PCI:domain:bus:dev.fn" and
+ * returns the respective values. If the string is not in this format,
+ * it returns 0.
+ */
+static int vga_pci_str_to_vars(char *buf, int count, unsigned int *domain,
+ unsigned int *bus, unsigned int *devfn)
+{
+ int n;
+ unsigned int slot, func;
+
+
+ n = sscanf(buf, "PCI:%x:%x:%x.%x", domain, bus, &slot, &func);
+ if (n != 4)
+ return 0;
+
+ *devfn = PCI_DEVFN(slot, func);
+
+ return 1;
+}
+
+static ssize_t vga_arb_read(struct file *file, char __user * buf,
+ size_t count, loff_t *ppos)
+{
+ struct vga_arb_private *priv = file->private_data;
+ struct vga_device *vgadev;
+ struct pci_dev *pdev;
+ unsigned long flags;
+ size_t len;
+ int rc;
+ char *lbuf;
+
+ lbuf = kmalloc(1024, GFP_KERNEL);
+ if (lbuf == NULL)
+ return -ENOMEM;
+
+ /* Shields against vga_arb_device_card_gone (pci_dev going
+ * away), and allows access to vga list
+ */
+ spin_lock_irqsave(&vga_lock, flags);
+
+ /* If we are targeting the default, use it */
+ pdev = priv->target;
+ if (pdev == NULL || pdev == PCI_INVALID_CARD) {
+ spin_unlock_irqrestore(&vga_lock, flags);
+ len = sprintf(lbuf, "invalid");
+ goto done;
+ }
+
+ /* Find card vgadev structure */
+ vgadev = vgadev_find(pdev);
+ if (vgadev == NULL) {
+ /* Wow, it's not in the list, that shouldn't happen,
+ * let's fix us up and return invalid card
+ */
+ if (pdev == priv->target)
+ vga_arb_device_card_gone(pdev);
+ spin_unlock_irqrestore(&vga_lock, flags);
+ len = sprintf(lbuf, "invalid");
+ goto done;
+ }
+
+ /* Fill the buffer with infos */
+ len = snprintf(lbuf, 1024,
+ "count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%d:%d)\n",
+ vga_decode_count, pci_name(pdev),
+ vga_iostate_to_str(vgadev->decodes),
+ vga_iostate_to_str(vgadev->owns),
+ vga_iostate_to_str(vgadev->locks),
+ vgadev->io_lock_cnt, vgadev->mem_lock_cnt);
+
+ spin_unlock_irqrestore(&vga_lock, flags);
+done:
+
+ /* Copy that to user */
+ if (len > count)
+ len = count;
+ rc = copy_to_user(buf, lbuf, len);
+ kfree(lbuf);
+ if (rc)
+ return -EFAULT;
+ return len;
+}
+
+/*
+ * TODO: To avoid parsing inside kernel and to improve the speed we may
+ * consider use ioctl here
+ */
+static ssize_t vga_arb_write(struct file *file, const char __user * buf,
+ size_t count, loff_t *ppos)
+{
+ struct vga_arb_private *priv = file->private_data;
+ struct vga_arb_user_card *uc = NULL;
+ struct pci_dev *pdev;
+
+ unsigned int io_state;
+
+ char *kbuf, *curr_pos;
+ size_t remaining = count;
+
+ int ret_val;
+ int i;
+
+
+ kbuf = kmalloc(count + 1, GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+
+ if (copy_from_user(kbuf, buf, count)) {
+ kfree(kbuf);
+ return -EFAULT;
+ }
+ curr_pos = kbuf;
+ kbuf[count] = '\0'; /* Just to make sure... */
+
+ if (strncmp(curr_pos, "lock ", 5) == 0) {
+ curr_pos += 5;
+ remaining -= 5;
+
+ pr_debug("client 0x%p called 'lock'\n", priv);
+
+ if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) {
+ ret_val = -EPROTO;
+ goto done;
+ }
+ if (io_state == VGA_RSRC_NONE) {
+ ret_val = -EPROTO;
+ goto done;
+ }
+
+ pdev = priv->target;
+ if (priv->target == NULL) {
+ ret_val = -ENODEV;
+ goto done;
+ }
+
+ vga_get_uninterruptible(pdev, io_state);
+
+ /* Update the client's locks lists... */
+ for (i = 0; i < MAX_USER_CARDS; i++) {
+ if (priv->cards[i].pdev == pdev) {
+ if (io_state & VGA_RSRC_LEGACY_IO)
+ priv->cards[i].io_cnt++;
+ if (io_state & VGA_RSRC_LEGACY_MEM)
+ priv->cards[i].mem_cnt++;
+ break;
+ }
+ }
+
+ ret_val = count;
+ goto done;
+ } else if (strncmp(curr_pos, "unlock ", 7) == 0) {
+ curr_pos += 7;
+ remaining -= 7;
+
+ pr_debug("client 0x%p called 'unlock'\n", priv);
+
+ if (strncmp(curr_pos, "all", 3) == 0)
+ io_state = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+ else {
+ if (!vga_str_to_iostate
+ (curr_pos, remaining, &io_state)) {
+ ret_val = -EPROTO;
+ goto done;
+ }
+ /* TODO: Add this?
+ if (io_state == VGA_RSRC_NONE) {
+ ret_val = -EPROTO;
+ goto done;
+ }
+ */
+ }
+
+ pdev = priv->target;
+ if (priv->target == NULL) {
+ ret_val = -ENODEV;
+ goto done;
+ }
+ for (i = 0; i < MAX_USER_CARDS; i++) {
+ if (priv->cards[i].pdev == pdev)
+ uc = &priv->cards[i];
+ }
+
+ if (!uc) {
+ ret_val = -EINVAL;
+ goto done;
+ }
+
+ if (io_state & VGA_RSRC_LEGACY_IO && uc->io_cnt == 0) {
+ ret_val = -EINVAL;
+ goto done;
+ }
+
+ if (io_state & VGA_RSRC_LEGACY_MEM && uc->mem_cnt == 0) {
+ ret_val = -EINVAL;
+ goto done;
+ }
+
+ vga_put(pdev, io_state);
+
+ if (io_state & VGA_RSRC_LEGACY_IO)
+ uc->io_cnt--;
+ if (io_state & VGA_RSRC_LEGACY_MEM)
+ uc->mem_cnt--;
+
+ ret_val = count;
+ goto done;
+ } else if (strncmp(curr_pos, "trylock ", 8) == 0) {
+ curr_pos += 8;
+ remaining -= 8;
+
+ pr_debug("client 0x%p called 'trylock'\n", priv);
+
+ if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) {
+ ret_val = -EPROTO;
+ goto done;
+ }
+ /* TODO: Add this?
+ if (io_state == VGA_RSRC_NONE) {
+ ret_val = -EPROTO;
+ goto done;
+ }
+ */
+
+ pdev = priv->target;
+ if (priv->target == NULL) {
+ ret_val = -ENODEV;
+ goto done;
+ }
+
+ if (vga_tryget(pdev, io_state)) {
+ /* Update the client's locks lists... */
+ for (i = 0; i < MAX_USER_CARDS; i++) {
+ if (priv->cards[i].pdev == pdev) {
+ if (io_state & VGA_RSRC_LEGACY_IO)
+ priv->cards[i].io_cnt++;
+ if (io_state & VGA_RSRC_LEGACY_MEM)
+ priv->cards[i].mem_cnt++;
+ break;
+ }
+ }
+ ret_val = count;
+ goto done;
+ } else {
+ ret_val = -EBUSY;
+ goto done;
+ }
+
+ } else if (strncmp(curr_pos, "target ", 7) == 0) {
+ struct pci_bus *pbus;
+ unsigned int domain, bus, devfn;
+ struct vga_device *vgadev;
+
+ curr_pos += 7;
+ remaining -= 7;
+ pr_debug("client 0x%p called 'target'\n", priv);
+ /* if target is default */
+ if (!strncmp(curr_pos, "default", 7))
+ pdev = pci_dev_get(vga_default_device());
+ else {
+ if (!vga_pci_str_to_vars(curr_pos, remaining,
+ &domain, &bus, &devfn)) {
+ ret_val = -EPROTO;
+ goto done;
+ }
+ pr_debug("vgaarb: %s ==> %x:%x:%x.%x\n", curr_pos,
+ domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
+
+ pbus = pci_find_bus(domain, bus);
+ pr_debug("vgaarb: pbus %p\n", pbus);
+ if (pbus == NULL) {
+ pr_err("vgaarb: invalid PCI domain and/or bus address %x:%x\n",
+ domain, bus);
+ ret_val = -ENODEV;
+ goto done;
+ }
+ pdev = pci_get_slot(pbus, devfn);
+ pr_debug("vgaarb: pdev %p\n", pdev);
+ if (!pdev) {
+ pr_err("vgaarb: invalid PCI address %x:%x\n",
+ bus, devfn);
+ ret_val = -ENODEV;
+ goto done;
+ }
+ }
+
+ vgadev = vgadev_find(pdev);
+ pr_debug("vgaarb: vgadev %p\n", vgadev);
+ if (vgadev == NULL) {
+ pr_err("vgaarb: this pci device is not a vga device\n");
+ pci_dev_put(pdev);
+ ret_val = -ENODEV;
+ goto done;
+ }
+
+ priv->target = pdev;
+ for (i = 0; i < MAX_USER_CARDS; i++) {
+ if (priv->cards[i].pdev == pdev)
+ break;
+ if (priv->cards[i].pdev == NULL) {
+ priv->cards[i].pdev = pdev;
+ priv->cards[i].io_cnt = 0;
+ priv->cards[i].mem_cnt = 0;
+ break;
+ }
+ }
+ if (i == MAX_USER_CARDS) {
+ pr_err("vgaarb: maximum user cards (%d) number reached!\n",
+ MAX_USER_CARDS);
+ pci_dev_put(pdev);
+ /* XXX: which value to return? */
+ ret_val = -ENOMEM;
+ goto done;
+ }
+
+ ret_val = count;
+ pci_dev_put(pdev);
+ goto done;
+
+
+ } else if (strncmp(curr_pos, "decodes ", 8) == 0) {
+ curr_pos += 8;
+ remaining -= 8;
+ pr_debug("vgaarb: client 0x%p called 'decodes'\n", priv);
+
+ if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) {
+ ret_val = -EPROTO;
+ goto done;
+ }
+ pdev = priv->target;
+ if (priv->target == NULL) {
+ ret_val = -ENODEV;
+ goto done;
+ }
+
+ __vga_set_legacy_decoding(pdev, io_state, true);
+ ret_val = count;
+ goto done;
+ }
+ /* If we got here, the message written is not part of the protocol! */
+ kfree(kbuf);
+ return -EPROTO;
+
+done:
+ kfree(kbuf);
+ return ret_val;
+}
+
+static unsigned int vga_arb_fpoll(struct file *file, poll_table * wait)
+{
+ struct vga_arb_private *priv = file->private_data;
+
+ pr_debug("%s\n", __func__);
+
+ if (priv == NULL)
+ return -ENODEV;
+ poll_wait(file, &vga_wait_queue, wait);
+ return POLLIN;
+}
+
+static int vga_arb_open(struct inode *inode, struct file *file)
+{
+ struct vga_arb_private *priv;
+ unsigned long flags;
+
+ pr_debug("%s\n", __func__);
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (priv == NULL)
+ return -ENOMEM;
+ spin_lock_init(&priv->lock);
+ file->private_data = priv;
+
+ spin_lock_irqsave(&vga_user_lock, flags);
+ list_add(&priv->list, &vga_user_list);
+ spin_unlock_irqrestore(&vga_user_lock, flags);
+
+ /* Set the client' lists of locks */
+ priv->target = vga_default_device(); /* Maybe this is still null! */
+ priv->cards[0].pdev = priv->target;
+ priv->cards[0].io_cnt = 0;
+ priv->cards[0].mem_cnt = 0;
+
+
+ return 0;
+}
+
+static int vga_arb_release(struct inode *inode, struct file *file)
+{
+ struct vga_arb_private *priv = file->private_data;
+ struct vga_arb_user_card *uc;
+ unsigned long flags;
+ int i;
+
+ pr_debug("%s\n", __func__);
+
+ if (priv == NULL)
+ return -ENODEV;
+
+ spin_lock_irqsave(&vga_user_lock, flags);
+ list_del(&priv->list);
+ for (i = 0; i < MAX_USER_CARDS; i++) {
+ uc = &priv->cards[i];
+ if (uc->pdev == NULL)
+ continue;
+ pr_debug("uc->io_cnt == %d, uc->mem_cnt == %d\n",
+ uc->io_cnt, uc->mem_cnt);
+ while (uc->io_cnt--)
+ vga_put(uc->pdev, VGA_RSRC_LEGACY_IO);
+ while (uc->mem_cnt--)
+ vga_put(uc->pdev, VGA_RSRC_LEGACY_MEM);
+ }
+ spin_unlock_irqrestore(&vga_user_lock, flags);
+
+ kfree(priv);
+
+ return 0;
+}
+
+static void vga_arb_device_card_gone(struct pci_dev *pdev)
+{
+}
+
+/*
+ * callback any registered clients to let them know we have a
+ * change in VGA cards
+ */
+static void vga_arbiter_notify_clients(void)
+{
+ struct vga_device *vgadev;
+ unsigned long flags;
+ uint32_t new_decodes;
+ bool new_state;
+
+ if (!vga_arbiter_used)
+ return;
+
+ spin_lock_irqsave(&vga_lock, flags);
+ list_for_each_entry(vgadev, &vga_list, list) {
+ if (vga_count > 1)
+ new_state = false;
+ else
+ new_state = true;
+ if (vgadev->set_vga_decode) {
+ new_decodes = vgadev->set_vga_decode(vgadev->cookie, new_state);
+ vga_update_device_decodes(vgadev, new_decodes);
+ }
+ }
+ spin_unlock_irqrestore(&vga_lock, flags);
+}
+
+static int pci_notify(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ struct device *dev = data;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ bool notify = false;
+
+ pr_debug("%s\n", __func__);
+
+ /* For now we're only intereted in devices added and removed. I didn't
+ * test this thing here, so someone needs to double check for the
+ * cases of hotplugable vga cards. */
+ if (action == BUS_NOTIFY_ADD_DEVICE)
+ notify = vga_arbiter_add_pci_device(pdev);
+ else if (action == BUS_NOTIFY_DEL_DEVICE)
+ notify = vga_arbiter_del_pci_device(pdev);
+
+ if (notify)
+ vga_arbiter_notify_clients();
+ return 0;
+}
+
+static struct notifier_block pci_notifier = {
+ .notifier_call = pci_notify,
+};
+
+static const struct file_operations vga_arb_device_fops = {
+ .read = vga_arb_read,
+ .write = vga_arb_write,
+ .poll = vga_arb_fpoll,
+ .open = vga_arb_open,
+ .release = vga_arb_release,
+ .llseek = noop_llseek,
+};
+
+static struct miscdevice vga_arb_device = {
+ MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops
+};
+
+static int __init vga_arb_device_init(void)
+{
+ int rc;
+ struct pci_dev *pdev;
+ struct vga_device *vgadev;
+
+ rc = misc_register(&vga_arb_device);
+ if (rc < 0)
+ pr_err("vgaarb: error %d registering device\n", rc);
+
+ bus_register_notifier(&pci_bus_type, &pci_notifier);
+
+ /* We add all pci devices satisfying vga class in the arbiter by
+ * default */
+ pdev = NULL;
+ while ((pdev =
+ pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
+ PCI_ANY_ID, pdev)) != NULL)
+ vga_arbiter_add_pci_device(pdev);
+
+ pr_info("vgaarb: loaded\n");
+
+ list_for_each_entry(vgadev, &vga_list, list) {
+ if (vgadev->bridge_has_one_vga)
+ pr_info("vgaarb: bridge control possible %s\n", pci_name(vgadev->pdev));
+ else
+ pr_info("vgaarb: no bridge control possible %s\n", pci_name(vgadev->pdev));
+ }
+ return rc;
+}
+subsys_initcall(vga_arb_device_init);