ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/infiniband/hw/hfi1/file_ops.c b/marvell/linux/drivers/infiniband/hw/hfi1/file_ops.c
new file mode 100644
index 0000000..607e263
--- /dev/null
+++ b/marvell/linux/drivers/infiniband/hw/hfi1/file_ops.c
@@ -0,0 +1,1728 @@
+/*
+ * Copyright(c) 2015-2017 Intel Corporation.
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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. See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * - Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#include <linux/poll.h>
+#include <linux/cdev.h>
+#include <linux/vmalloc.h>
+#include <linux/io.h>
+#include <linux/sched/mm.h>
+#include <linux/bitmap.h>
+
+#include <rdma/ib.h>
+
+#include "hfi.h"
+#include "pio.h"
+#include "device.h"
+#include "common.h"
+#include "trace.h"
+#include "mmu_rb.h"
+#include "user_sdma.h"
+#include "user_exp_rcv.h"
+#include "aspm.h"
+
+#undef pr_fmt
+#define pr_fmt(fmt) DRIVER_NAME ": " fmt
+
+#define SEND_CTXT_HALT_TIMEOUT 1000 /* msecs */
+
+/*
+ * File operation functions
+ */
+static int hfi1_file_open(struct inode *inode, struct file *fp);
+static int hfi1_file_close(struct inode *inode, struct file *fp);
+static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from);
+static __poll_t hfi1_poll(struct file *fp, struct poll_table_struct *pt);
+static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma);
+
+static u64 kvirt_to_phys(void *addr);
+static int assign_ctxt(struct hfi1_filedata *fd, unsigned long arg, u32 len);
+static void init_subctxts(struct hfi1_ctxtdata *uctxt,
+ const struct hfi1_user_info *uinfo);
+static int init_user_ctxt(struct hfi1_filedata *fd,
+ struct hfi1_ctxtdata *uctxt);
+static void user_init(struct hfi1_ctxtdata *uctxt);
+static int get_ctxt_info(struct hfi1_filedata *fd, unsigned long arg, u32 len);
+static int get_base_info(struct hfi1_filedata *fd, unsigned long arg, u32 len);
+static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg,
+ u32 len);
+static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg,
+ u32 len);
+static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg,
+ u32 len);
+static int setup_base_ctxt(struct hfi1_filedata *fd,
+ struct hfi1_ctxtdata *uctxt);
+static int setup_subctxt(struct hfi1_ctxtdata *uctxt);
+
+static int find_sub_ctxt(struct hfi1_filedata *fd,
+ const struct hfi1_user_info *uinfo);
+static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
+ struct hfi1_user_info *uinfo,
+ struct hfi1_ctxtdata **cd);
+static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt);
+static __poll_t poll_urgent(struct file *fp, struct poll_table_struct *pt);
+static __poll_t poll_next(struct file *fp, struct poll_table_struct *pt);
+static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt,
+ unsigned long arg);
+static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg);
+static int ctxt_reset(struct hfi1_ctxtdata *uctxt);
+static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt,
+ unsigned long arg);
+static vm_fault_t vma_fault(struct vm_fault *vmf);
+static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
+ unsigned long arg);
+
+static const struct file_operations hfi1_file_ops = {
+ .owner = THIS_MODULE,
+ .write_iter = hfi1_write_iter,
+ .open = hfi1_file_open,
+ .release = hfi1_file_close,
+ .unlocked_ioctl = hfi1_file_ioctl,
+ .poll = hfi1_poll,
+ .mmap = hfi1_file_mmap,
+ .llseek = noop_llseek,
+};
+
+static const struct vm_operations_struct vm_ops = {
+ .fault = vma_fault,
+};
+
+/*
+ * Types of memories mapped into user processes' space
+ */
+enum mmap_types {
+ PIO_BUFS = 1,
+ PIO_BUFS_SOP,
+ PIO_CRED,
+ RCV_HDRQ,
+ RCV_EGRBUF,
+ UREGS,
+ EVENTS,
+ STATUS,
+ RTAIL,
+ SUBCTXT_UREGS,
+ SUBCTXT_RCV_HDRQ,
+ SUBCTXT_EGRBUF,
+ SDMA_COMP
+};
+
+/*
+ * Masks and offsets defining the mmap tokens
+ */
+#define HFI1_MMAP_OFFSET_MASK 0xfffULL
+#define HFI1_MMAP_OFFSET_SHIFT 0
+#define HFI1_MMAP_SUBCTXT_MASK 0xfULL
+#define HFI1_MMAP_SUBCTXT_SHIFT 12
+#define HFI1_MMAP_CTXT_MASK 0xffULL
+#define HFI1_MMAP_CTXT_SHIFT 16
+#define HFI1_MMAP_TYPE_MASK 0xfULL
+#define HFI1_MMAP_TYPE_SHIFT 24
+#define HFI1_MMAP_MAGIC_MASK 0xffffffffULL
+#define HFI1_MMAP_MAGIC_SHIFT 32
+
+#define HFI1_MMAP_MAGIC 0xdabbad00
+
+#define HFI1_MMAP_TOKEN_SET(field, val) \
+ (((val) & HFI1_MMAP_##field##_MASK) << HFI1_MMAP_##field##_SHIFT)
+#define HFI1_MMAP_TOKEN_GET(field, token) \
+ (((token) >> HFI1_MMAP_##field##_SHIFT) & HFI1_MMAP_##field##_MASK)
+#define HFI1_MMAP_TOKEN(type, ctxt, subctxt, addr) \
+ (HFI1_MMAP_TOKEN_SET(MAGIC, HFI1_MMAP_MAGIC) | \
+ HFI1_MMAP_TOKEN_SET(TYPE, type) | \
+ HFI1_MMAP_TOKEN_SET(CTXT, ctxt) | \
+ HFI1_MMAP_TOKEN_SET(SUBCTXT, subctxt) | \
+ HFI1_MMAP_TOKEN_SET(OFFSET, (offset_in_page(addr))))
+
+#define dbg(fmt, ...) \
+ pr_info(fmt, ##__VA_ARGS__)
+
+static inline int is_valid_mmap(u64 token)
+{
+ return (HFI1_MMAP_TOKEN_GET(MAGIC, token) == HFI1_MMAP_MAGIC);
+}
+
+static int hfi1_file_open(struct inode *inode, struct file *fp)
+{
+ struct hfi1_filedata *fd;
+ struct hfi1_devdata *dd = container_of(inode->i_cdev,
+ struct hfi1_devdata,
+ user_cdev);
+
+ if (!((dd->flags & HFI1_PRESENT) && dd->kregbase1))
+ return -EINVAL;
+
+ if (!atomic_inc_not_zero(&dd->user_refcount))
+ return -ENXIO;
+
+ /* The real work is performed later in assign_ctxt() */
+
+ fd = kzalloc(sizeof(*fd), GFP_KERNEL);
+
+ if (!fd || init_srcu_struct(&fd->pq_srcu))
+ goto nomem;
+ spin_lock_init(&fd->pq_rcu_lock);
+ spin_lock_init(&fd->tid_lock);
+ spin_lock_init(&fd->invalid_lock);
+ fd->rec_cpu_num = -1; /* no cpu affinity by default */
+ fd->mm = current->mm;
+ mmgrab(fd->mm);
+ fd->dd = dd;
+ kobject_get(&fd->dd->kobj);
+ fp->private_data = fd;
+ return 0;
+nomem:
+ kfree(fd);
+ fp->private_data = NULL;
+ if (atomic_dec_and_test(&dd->user_refcount))
+ complete(&dd->user_comp);
+ return -ENOMEM;
+}
+
+static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
+ unsigned long arg)
+{
+ struct hfi1_filedata *fd = fp->private_data;
+ struct hfi1_ctxtdata *uctxt = fd->uctxt;
+ int ret = 0;
+ int uval = 0;
+
+ hfi1_cdbg(IOCTL, "IOCTL recv: 0x%x", cmd);
+ if (cmd != HFI1_IOCTL_ASSIGN_CTXT &&
+ cmd != HFI1_IOCTL_GET_VERS &&
+ !uctxt)
+ return -EINVAL;
+
+ switch (cmd) {
+ case HFI1_IOCTL_ASSIGN_CTXT:
+ ret = assign_ctxt(fd, arg, _IOC_SIZE(cmd));
+ break;
+
+ case HFI1_IOCTL_CTXT_INFO:
+ ret = get_ctxt_info(fd, arg, _IOC_SIZE(cmd));
+ break;
+
+ case HFI1_IOCTL_USER_INFO:
+ ret = get_base_info(fd, arg, _IOC_SIZE(cmd));
+ break;
+
+ case HFI1_IOCTL_CREDIT_UPD:
+ if (uctxt)
+ sc_return_credits(uctxt->sc);
+ break;
+
+ case HFI1_IOCTL_TID_UPDATE:
+ ret = user_exp_rcv_setup(fd, arg, _IOC_SIZE(cmd));
+ break;
+
+ case HFI1_IOCTL_TID_FREE:
+ ret = user_exp_rcv_clear(fd, arg, _IOC_SIZE(cmd));
+ break;
+
+ case HFI1_IOCTL_TID_INVAL_READ:
+ ret = user_exp_rcv_invalid(fd, arg, _IOC_SIZE(cmd));
+ break;
+
+ case HFI1_IOCTL_RECV_CTRL:
+ ret = manage_rcvq(uctxt, fd->subctxt, arg);
+ break;
+
+ case HFI1_IOCTL_POLL_TYPE:
+ if (get_user(uval, (int __user *)arg))
+ return -EFAULT;
+ uctxt->poll_type = (typeof(uctxt->poll_type))uval;
+ break;
+
+ case HFI1_IOCTL_ACK_EVENT:
+ ret = user_event_ack(uctxt, fd->subctxt, arg);
+ break;
+
+ case HFI1_IOCTL_SET_PKEY:
+ ret = set_ctxt_pkey(uctxt, arg);
+ break;
+
+ case HFI1_IOCTL_CTXT_RESET:
+ ret = ctxt_reset(uctxt);
+ break;
+
+ case HFI1_IOCTL_GET_VERS:
+ uval = HFI1_USER_SWVERSION;
+ if (put_user(uval, (int __user *)arg))
+ return -EFAULT;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from)
+{
+ struct hfi1_filedata *fd = kiocb->ki_filp->private_data;
+ struct hfi1_user_sdma_pkt_q *pq;
+ struct hfi1_user_sdma_comp_q *cq = fd->cq;
+ int done = 0, reqs = 0;
+ unsigned long dim = from->nr_segs;
+ int idx;
+
+ if (!HFI1_CAP_IS_KSET(SDMA))
+ return -EINVAL;
+ idx = srcu_read_lock(&fd->pq_srcu);
+ pq = srcu_dereference(fd->pq, &fd->pq_srcu);
+ if (!cq || !pq) {
+ srcu_read_unlock(&fd->pq_srcu, idx);
+ return -EIO;
+ }
+
+ if (!iter_is_iovec(from) || !dim) {
+ srcu_read_unlock(&fd->pq_srcu, idx);
+ return -EINVAL;
+ }
+
+ trace_hfi1_sdma_request(fd->dd, fd->uctxt->ctxt, fd->subctxt, dim);
+
+ if (atomic_read(&pq->n_reqs) == pq->n_max_reqs) {
+ srcu_read_unlock(&fd->pq_srcu, idx);
+ return -ENOSPC;
+ }
+
+ while (dim) {
+ int ret;
+ unsigned long count = 0;
+
+ ret = hfi1_user_sdma_process_request(
+ fd, (struct iovec *)(from->iov + done),
+ dim, &count);
+ if (ret) {
+ reqs = ret;
+ break;
+ }
+ dim -= count;
+ done += count;
+ reqs++;
+ }
+
+ srcu_read_unlock(&fd->pq_srcu, idx);
+ return reqs;
+}
+
+static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
+{
+ struct hfi1_filedata *fd = fp->private_data;
+ struct hfi1_ctxtdata *uctxt = fd->uctxt;
+ struct hfi1_devdata *dd;
+ unsigned long flags;
+ u64 token = vma->vm_pgoff << PAGE_SHIFT,
+ memaddr = 0;
+ void *memvirt = NULL;
+ u8 subctxt, mapio = 0, vmf = 0, type;
+ ssize_t memlen = 0;
+ int ret = 0;
+ u16 ctxt;
+
+ if (!is_valid_mmap(token) || !uctxt ||
+ !(vma->vm_flags & VM_SHARED)) {
+ ret = -EINVAL;
+ goto done;
+ }
+ dd = uctxt->dd;
+ ctxt = HFI1_MMAP_TOKEN_GET(CTXT, token);
+ subctxt = HFI1_MMAP_TOKEN_GET(SUBCTXT, token);
+ type = HFI1_MMAP_TOKEN_GET(TYPE, token);
+ if (ctxt != uctxt->ctxt || subctxt != fd->subctxt) {
+ ret = -EINVAL;
+ goto done;
+ }
+
+ flags = vma->vm_flags;
+
+ switch (type) {
+ case PIO_BUFS:
+ case PIO_BUFS_SOP:
+ memaddr = ((dd->physaddr + TXE_PIO_SEND) +
+ /* chip pio base */
+ (uctxt->sc->hw_context * BIT(16))) +
+ /* 64K PIO space / ctxt */
+ (type == PIO_BUFS_SOP ?
+ (TXE_PIO_SIZE / 2) : 0); /* sop? */
+ /*
+ * Map only the amount allocated to the context, not the
+ * entire available context's PIO space.
+ */
+ memlen = PAGE_ALIGN(uctxt->sc->credits * PIO_BLOCK_SIZE);
+ flags &= ~VM_MAYREAD;
+ flags |= VM_DONTCOPY | VM_DONTEXPAND;
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+ mapio = 1;
+ break;
+ case PIO_CRED:
+ if (flags & VM_WRITE) {
+ ret = -EPERM;
+ goto done;
+ }
+ /*
+ * The credit return location for this context could be on the
+ * second or third page allocated for credit returns (if number
+ * of enabled contexts > 64 and 128 respectively).
+ */
+ memvirt = dd->cr_base[uctxt->numa_id].va;
+ memaddr = virt_to_phys(memvirt) +
+ (((u64)uctxt->sc->hw_free -
+ (u64)dd->cr_base[uctxt->numa_id].va) & PAGE_MASK);
+ memlen = PAGE_SIZE;
+ flags &= ~VM_MAYWRITE;
+ flags |= VM_DONTCOPY | VM_DONTEXPAND;
+ /*
+ * The driver has already allocated memory for credit
+ * returns and programmed it into the chip. Has that
+ * memory been flagged as non-cached?
+ */
+ /* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
+ mapio = 1;
+ break;
+ case RCV_HDRQ:
+ memlen = rcvhdrq_size(uctxt);
+ memvirt = uctxt->rcvhdrq;
+ break;
+ case RCV_EGRBUF: {
+ unsigned long addr;
+ int i;
+ /*
+ * The RcvEgr buffer need to be handled differently
+ * as multiple non-contiguous pages need to be mapped
+ * into the user process.
+ */
+ memlen = uctxt->egrbufs.size;
+ if ((vma->vm_end - vma->vm_start) != memlen) {
+ dd_dev_err(dd, "Eager buffer map size invalid (%lu != %lu)\n",
+ (vma->vm_end - vma->vm_start), memlen);
+ ret = -EINVAL;
+ goto done;
+ }
+ if (vma->vm_flags & VM_WRITE) {
+ ret = -EPERM;
+ goto done;
+ }
+ vma->vm_flags &= ~VM_MAYWRITE;
+ addr = vma->vm_start;
+ for (i = 0 ; i < uctxt->egrbufs.numbufs; i++) {
+ memlen = uctxt->egrbufs.buffers[i].len;
+ memvirt = uctxt->egrbufs.buffers[i].addr;
+ ret = remap_pfn_range(
+ vma, addr,
+ /*
+ * virt_to_pfn() does the same, but
+ * it's not available on x86_64
+ * when CONFIG_MMU is enabled.
+ */
+ PFN_DOWN(__pa(memvirt)),
+ memlen,
+ vma->vm_page_prot);
+ if (ret < 0)
+ goto done;
+ addr += memlen;
+ }
+ ret = 0;
+ goto done;
+ }
+ case UREGS:
+ /*
+ * Map only the page that contains this context's user
+ * registers.
+ */
+ memaddr = (unsigned long)
+ (dd->physaddr + RXE_PER_CONTEXT_USER)
+ + (uctxt->ctxt * RXE_PER_CONTEXT_SIZE);
+ /*
+ * TidFlow table is on the same page as the rest of the
+ * user registers.
+ */
+ memlen = PAGE_SIZE;
+ flags |= VM_DONTCOPY | VM_DONTEXPAND;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ mapio = 1;
+ break;
+ case EVENTS:
+ /*
+ * Use the page where this context's flags are. User level
+ * knows where it's own bitmap is within the page.
+ */
+ memaddr = (unsigned long)
+ (dd->events + uctxt_offset(uctxt)) & PAGE_MASK;
+ memlen = PAGE_SIZE;
+ /*
+ * v3.7 removes VM_RESERVED but the effect is kept by
+ * using VM_IO.
+ */
+ flags |= VM_IO | VM_DONTEXPAND;
+ vmf = 1;
+ break;
+ case STATUS:
+ if (flags & VM_WRITE) {
+ ret = -EPERM;
+ goto done;
+ }
+ memaddr = kvirt_to_phys((void *)dd->status);
+ memlen = PAGE_SIZE;
+ flags |= VM_IO | VM_DONTEXPAND;
+ break;
+ case RTAIL:
+ if (!HFI1_CAP_IS_USET(DMA_RTAIL)) {
+ /*
+ * If the memory allocation failed, the context alloc
+ * also would have failed, so we would never get here
+ */
+ ret = -EINVAL;
+ goto done;
+ }
+ if ((flags & VM_WRITE) || !uctxt->rcvhdrtail_kvaddr) {
+ ret = -EPERM;
+ goto done;
+ }
+ memlen = PAGE_SIZE;
+ memvirt = (void *)uctxt->rcvhdrtail_kvaddr;
+ flags &= ~VM_MAYWRITE;
+ break;
+ case SUBCTXT_UREGS:
+ memaddr = (u64)uctxt->subctxt_uregbase;
+ memlen = PAGE_SIZE;
+ flags |= VM_IO | VM_DONTEXPAND;
+ vmf = 1;
+ break;
+ case SUBCTXT_RCV_HDRQ:
+ memaddr = (u64)uctxt->subctxt_rcvhdr_base;
+ memlen = rcvhdrq_size(uctxt) * uctxt->subctxt_cnt;
+ flags |= VM_IO | VM_DONTEXPAND;
+ vmf = 1;
+ break;
+ case SUBCTXT_EGRBUF:
+ memaddr = (u64)uctxt->subctxt_rcvegrbuf;
+ memlen = uctxt->egrbufs.size * uctxt->subctxt_cnt;
+ flags |= VM_IO | VM_DONTEXPAND;
+ flags &= ~VM_MAYWRITE;
+ vmf = 1;
+ break;
+ case SDMA_COMP: {
+ struct hfi1_user_sdma_comp_q *cq = fd->cq;
+
+ if (!cq) {
+ ret = -EFAULT;
+ goto done;
+ }
+ memaddr = (u64)cq->comps;
+ memlen = PAGE_ALIGN(sizeof(*cq->comps) * cq->nentries);
+ flags |= VM_IO | VM_DONTEXPAND;
+ vmf = 1;
+ break;
+ }
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ if ((vma->vm_end - vma->vm_start) != memlen) {
+ hfi1_cdbg(PROC, "%u:%u Memory size mismatch %lu:%lu",
+ uctxt->ctxt, fd->subctxt,
+ (vma->vm_end - vma->vm_start), memlen);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ vma->vm_flags = flags;
+ hfi1_cdbg(PROC,
+ "%u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n",
+ ctxt, subctxt, type, mapio, vmf, memaddr, memlen,
+ vma->vm_end - vma->vm_start, vma->vm_flags);
+ if (vmf) {
+ vma->vm_pgoff = PFN_DOWN(memaddr);
+ vma->vm_ops = &vm_ops;
+ ret = 0;
+ } else if (mapio) {
+ ret = io_remap_pfn_range(vma, vma->vm_start,
+ PFN_DOWN(memaddr),
+ memlen,
+ vma->vm_page_prot);
+ } else if (memvirt) {
+ ret = remap_pfn_range(vma, vma->vm_start,
+ PFN_DOWN(__pa(memvirt)),
+ memlen,
+ vma->vm_page_prot);
+ } else {
+ ret = remap_pfn_range(vma, vma->vm_start,
+ PFN_DOWN(memaddr),
+ memlen,
+ vma->vm_page_prot);
+ }
+done:
+ return ret;
+}
+
+/*
+ * Local (non-chip) user memory is not mapped right away but as it is
+ * accessed by the user-level code.
+ */
+static vm_fault_t vma_fault(struct vm_fault *vmf)
+{
+ struct page *page;
+
+ page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
+ if (!page)
+ return VM_FAULT_SIGBUS;
+
+ get_page(page);
+ vmf->page = page;
+
+ return 0;
+}
+
+static __poll_t hfi1_poll(struct file *fp, struct poll_table_struct *pt)
+{
+ struct hfi1_ctxtdata *uctxt;
+ __poll_t pollflag;
+
+ uctxt = ((struct hfi1_filedata *)fp->private_data)->uctxt;
+ if (!uctxt)
+ pollflag = EPOLLERR;
+ else if (uctxt->poll_type == HFI1_POLL_TYPE_URGENT)
+ pollflag = poll_urgent(fp, pt);
+ else if (uctxt->poll_type == HFI1_POLL_TYPE_ANYRCV)
+ pollflag = poll_next(fp, pt);
+ else /* invalid */
+ pollflag = EPOLLERR;
+
+ return pollflag;
+}
+
+static int hfi1_file_close(struct inode *inode, struct file *fp)
+{
+ struct hfi1_filedata *fdata = fp->private_data;
+ struct hfi1_ctxtdata *uctxt = fdata->uctxt;
+ struct hfi1_devdata *dd = container_of(inode->i_cdev,
+ struct hfi1_devdata,
+ user_cdev);
+ unsigned long flags, *ev;
+
+ fp->private_data = NULL;
+
+ if (!uctxt)
+ goto done;
+
+ hfi1_cdbg(PROC, "closing ctxt %u:%u", uctxt->ctxt, fdata->subctxt);
+
+ flush_wc();
+ /* drain user sdma queue */
+ hfi1_user_sdma_free_queues(fdata, uctxt);
+
+ /* release the cpu */
+ hfi1_put_proc_affinity(fdata->rec_cpu_num);
+
+ /* clean up rcv side */
+ hfi1_user_exp_rcv_free(fdata);
+
+ /*
+ * fdata->uctxt is used in the above cleanup. It is not ready to be
+ * removed until here.
+ */
+ fdata->uctxt = NULL;
+ hfi1_rcd_put(uctxt);
+
+ /*
+ * Clear any left over, unhandled events so the next process that
+ * gets this context doesn't get confused.
+ */
+ ev = dd->events + uctxt_offset(uctxt) + fdata->subctxt;
+ *ev = 0;
+
+ spin_lock_irqsave(&dd->uctxt_lock, flags);
+ __clear_bit(fdata->subctxt, uctxt->in_use_ctxts);
+ if (!bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) {
+ spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+ goto done;
+ }
+ spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+
+ /*
+ * Disable receive context and interrupt available, reset all
+ * RcvCtxtCtrl bits to default values.
+ */
+ hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
+ HFI1_RCVCTRL_TIDFLOW_DIS |
+ HFI1_RCVCTRL_INTRAVAIL_DIS |
+ HFI1_RCVCTRL_TAILUPD_DIS |
+ HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
+ HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
+ HFI1_RCVCTRL_NO_EGR_DROP_DIS |
+ HFI1_RCVCTRL_URGENT_DIS, uctxt);
+ /* Clear the context's J_KEY */
+ hfi1_clear_ctxt_jkey(dd, uctxt);
+ /*
+ * If a send context is allocated, reset context integrity
+ * checks to default and disable the send context.
+ */
+ if (uctxt->sc) {
+ sc_disable(uctxt->sc);
+ set_pio_integrity(uctxt->sc);
+ }
+
+ hfi1_free_ctxt_rcv_groups(uctxt);
+ hfi1_clear_ctxt_pkey(dd, uctxt);
+
+ uctxt->event_flags = 0;
+
+ deallocate_ctxt(uctxt);
+done:
+ mmdrop(fdata->mm);
+ kobject_put(&dd->kobj);
+
+ if (atomic_dec_and_test(&dd->user_refcount))
+ complete(&dd->user_comp);
+
+ cleanup_srcu_struct(&fdata->pq_srcu);
+ kfree(fdata);
+ return 0;
+}
+
+/*
+ * Convert kernel *virtual* addresses to physical addresses.
+ * This is used to vmalloc'ed addresses.
+ */
+static u64 kvirt_to_phys(void *addr)
+{
+ struct page *page;
+ u64 paddr = 0;
+
+ page = vmalloc_to_page(addr);
+ if (page)
+ paddr = page_to_pfn(page) << PAGE_SHIFT;
+
+ return paddr;
+}
+
+/**
+ * complete_subctxt
+ * @fd: valid filedata pointer
+ *
+ * Sub-context info can only be set up after the base context
+ * has been completed. This is indicated by the clearing of the
+ * HFI1_CTXT_BASE_UINIT bit.
+ *
+ * Wait for the bit to be cleared, and then complete the subcontext
+ * initialization.
+ *
+ */
+static int complete_subctxt(struct hfi1_filedata *fd)
+{
+ int ret;
+ unsigned long flags;
+
+ /*
+ * sub-context info can only be set up after the base context
+ * has been completed.
+ */
+ ret = wait_event_interruptible(
+ fd->uctxt->wait,
+ !test_bit(HFI1_CTXT_BASE_UNINIT, &fd->uctxt->event_flags));
+
+ if (test_bit(HFI1_CTXT_BASE_FAILED, &fd->uctxt->event_flags))
+ ret = -ENOMEM;
+
+ /* Finish the sub-context init */
+ if (!ret) {
+ fd->rec_cpu_num = hfi1_get_proc_affinity(fd->uctxt->numa_id);
+ ret = init_user_ctxt(fd, fd->uctxt);
+ }
+
+ if (ret) {
+ spin_lock_irqsave(&fd->dd->uctxt_lock, flags);
+ __clear_bit(fd->subctxt, fd->uctxt->in_use_ctxts);
+ spin_unlock_irqrestore(&fd->dd->uctxt_lock, flags);
+ hfi1_rcd_put(fd->uctxt);
+ fd->uctxt = NULL;
+ }
+
+ return ret;
+}
+
+static int assign_ctxt(struct hfi1_filedata *fd, unsigned long arg, u32 len)
+{
+ int ret;
+ unsigned int swmajor;
+ struct hfi1_ctxtdata *uctxt = NULL;
+ struct hfi1_user_info uinfo;
+
+ if (fd->uctxt)
+ return -EINVAL;
+
+ if (sizeof(uinfo) != len)
+ return -EINVAL;
+
+ if (copy_from_user(&uinfo, (void __user *)arg, sizeof(uinfo)))
+ return -EFAULT;
+
+ swmajor = uinfo.userversion >> 16;
+ if (swmajor != HFI1_USER_SWMAJOR)
+ return -ENODEV;
+
+ if (uinfo.subctxt_cnt > HFI1_MAX_SHARED_CTXTS)
+ return -EINVAL;
+
+ /*
+ * Acquire the mutex to protect against multiple creations of what
+ * could be a shared base context.
+ */
+ mutex_lock(&hfi1_mutex);
+ /*
+ * Get a sub context if available (fd->uctxt will be set).
+ * ret < 0 error, 0 no context, 1 sub-context found
+ */
+ ret = find_sub_ctxt(fd, &uinfo);
+
+ /*
+ * Allocate a base context if context sharing is not required or a
+ * sub context wasn't found.
+ */
+ if (!ret)
+ ret = allocate_ctxt(fd, fd->dd, &uinfo, &uctxt);
+
+ mutex_unlock(&hfi1_mutex);
+
+ /* Depending on the context type, finish the appropriate init */
+ switch (ret) {
+ case 0:
+ ret = setup_base_ctxt(fd, uctxt);
+ if (ret)
+ deallocate_ctxt(uctxt);
+ break;
+ case 1:
+ ret = complete_subctxt(fd);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * match_ctxt
+ * @fd: valid filedata pointer
+ * @uinfo: user info to compare base context with
+ * @uctxt: context to compare uinfo to.
+ *
+ * Compare the given context with the given information to see if it
+ * can be used for a sub context.
+ */
+static int match_ctxt(struct hfi1_filedata *fd,
+ const struct hfi1_user_info *uinfo,
+ struct hfi1_ctxtdata *uctxt)
+{
+ struct hfi1_devdata *dd = fd->dd;
+ unsigned long flags;
+ u16 subctxt;
+
+ /* Skip dynamically allocated kernel contexts */
+ if (uctxt->sc && (uctxt->sc->type == SC_KERNEL))
+ return 0;
+
+ /* Skip ctxt if it doesn't match the requested one */
+ if (memcmp(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid)) ||
+ uctxt->jkey != generate_jkey(current_uid()) ||
+ uctxt->subctxt_id != uinfo->subctxt_id ||
+ uctxt->subctxt_cnt != uinfo->subctxt_cnt)
+ return 0;
+
+ /* Verify the sharing process matches the base */
+ if (uctxt->userversion != uinfo->userversion)
+ return -EINVAL;
+
+ /* Find an unused sub context */
+ spin_lock_irqsave(&dd->uctxt_lock, flags);
+ if (bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) {
+ /* context is being closed, do not use */
+ spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+ return 0;
+ }
+
+ subctxt = find_first_zero_bit(uctxt->in_use_ctxts,
+ HFI1_MAX_SHARED_CTXTS);
+ if (subctxt >= uctxt->subctxt_cnt) {
+ spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+ return -EBUSY;
+ }
+
+ fd->subctxt = subctxt;
+ __set_bit(fd->subctxt, uctxt->in_use_ctxts);
+ spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+
+ fd->uctxt = uctxt;
+ hfi1_rcd_get(uctxt);
+
+ return 1;
+}
+
+/**
+ * find_sub_ctxt
+ * @fd: valid filedata pointer
+ * @uinfo: matching info to use to find a possible context to share.
+ *
+ * The hfi1_mutex must be held when this function is called. It is
+ * necessary to ensure serialized creation of shared contexts.
+ *
+ * Return:
+ * 0 No sub-context found
+ * 1 Subcontext found and allocated
+ * errno EINVAL (incorrect parameters)
+ * EBUSY (all sub contexts in use)
+ */
+static int find_sub_ctxt(struct hfi1_filedata *fd,
+ const struct hfi1_user_info *uinfo)
+{
+ struct hfi1_ctxtdata *uctxt;
+ struct hfi1_devdata *dd = fd->dd;
+ u16 i;
+ int ret;
+
+ if (!uinfo->subctxt_cnt)
+ return 0;
+
+ for (i = dd->first_dyn_alloc_ctxt; i < dd->num_rcv_contexts; i++) {
+ uctxt = hfi1_rcd_get_by_index(dd, i);
+ if (uctxt) {
+ ret = match_ctxt(fd, uinfo, uctxt);
+ hfi1_rcd_put(uctxt);
+ /* value of != 0 will return */
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
+ struct hfi1_user_info *uinfo,
+ struct hfi1_ctxtdata **rcd)
+{
+ struct hfi1_ctxtdata *uctxt;
+ int ret, numa;
+
+ if (dd->flags & HFI1_FROZEN) {
+ /*
+ * Pick an error that is unique from all other errors
+ * that are returned so the user process knows that
+ * it tried to allocate while the SPC was frozen. It
+ * it should be able to retry with success in a short
+ * while.
+ */
+ return -EIO;
+ }
+
+ if (!dd->freectxts)
+ return -EBUSY;
+
+ /*
+ * If we don't have a NUMA node requested, preference is towards
+ * device NUMA node.
+ */
+ fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node);
+ if (fd->rec_cpu_num != -1)
+ numa = cpu_to_node(fd->rec_cpu_num);
+ else
+ numa = numa_node_id();
+ ret = hfi1_create_ctxtdata(dd->pport, numa, &uctxt);
+ if (ret < 0) {
+ dd_dev_err(dd, "user ctxtdata allocation failed\n");
+ return ret;
+ }
+ hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)",
+ uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num,
+ uctxt->numa_id);
+
+ /*
+ * Allocate and enable a PIO send context.
+ */
+ uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize, dd->node);
+ if (!uctxt->sc) {
+ ret = -ENOMEM;
+ goto ctxdata_free;
+ }
+ hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index,
+ uctxt->sc->hw_context);
+ ret = sc_enable(uctxt->sc);
+ if (ret)
+ goto ctxdata_free;
+
+ /*
+ * Setup sub context information if the user-level has requested
+ * sub contexts.
+ * This has to be done here so the rest of the sub-contexts find the
+ * proper base context.
+ * NOTE: _set_bit() can be used here because the context creation is
+ * protected by the mutex (rather than the spin_lock), and will be the
+ * very first instance of this context.
+ */
+ __set_bit(0, uctxt->in_use_ctxts);
+ if (uinfo->subctxt_cnt)
+ init_subctxts(uctxt, uinfo);
+ uctxt->userversion = uinfo->userversion;
+ uctxt->flags = hfi1_cap_mask; /* save current flag state */
+ init_waitqueue_head(&uctxt->wait);
+ strlcpy(uctxt->comm, current->comm, sizeof(uctxt->comm));
+ memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid));
+ uctxt->jkey = generate_jkey(current_uid());
+ hfi1_stats.sps_ctxts++;
+ /*
+ * Disable ASPM when there are open user/PSM contexts to avoid
+ * issues with ASPM L1 exit latency
+ */
+ if (dd->freectxts-- == dd->num_user_contexts)
+ aspm_disable_all(dd);
+
+ *rcd = uctxt;
+
+ return 0;
+
+ctxdata_free:
+ hfi1_free_ctxt(uctxt);
+ return ret;
+}
+
+static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt)
+{
+ mutex_lock(&hfi1_mutex);
+ hfi1_stats.sps_ctxts--;
+ if (++uctxt->dd->freectxts == uctxt->dd->num_user_contexts)
+ aspm_enable_all(uctxt->dd);
+ mutex_unlock(&hfi1_mutex);
+
+ hfi1_free_ctxt(uctxt);
+}
+
+static void init_subctxts(struct hfi1_ctxtdata *uctxt,
+ const struct hfi1_user_info *uinfo)
+{
+ uctxt->subctxt_cnt = uinfo->subctxt_cnt;
+ uctxt->subctxt_id = uinfo->subctxt_id;
+ set_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
+}
+
+static int setup_subctxt(struct hfi1_ctxtdata *uctxt)
+{
+ int ret = 0;
+ u16 num_subctxts = uctxt->subctxt_cnt;
+
+ uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE);
+ if (!uctxt->subctxt_uregbase)
+ return -ENOMEM;
+
+ /* We can take the size of the RcvHdr Queue from the master */
+ uctxt->subctxt_rcvhdr_base = vmalloc_user(rcvhdrq_size(uctxt) *
+ num_subctxts);
+ if (!uctxt->subctxt_rcvhdr_base) {
+ ret = -ENOMEM;
+ goto bail_ureg;
+ }
+
+ uctxt->subctxt_rcvegrbuf = vmalloc_user(uctxt->egrbufs.size *
+ num_subctxts);
+ if (!uctxt->subctxt_rcvegrbuf) {
+ ret = -ENOMEM;
+ goto bail_rhdr;
+ }
+
+ return 0;
+
+bail_rhdr:
+ vfree(uctxt->subctxt_rcvhdr_base);
+ uctxt->subctxt_rcvhdr_base = NULL;
+bail_ureg:
+ vfree(uctxt->subctxt_uregbase);
+ uctxt->subctxt_uregbase = NULL;
+
+ return ret;
+}
+
+static void user_init(struct hfi1_ctxtdata *uctxt)
+{
+ unsigned int rcvctrl_ops = 0;
+
+ /* initialize poll variables... */
+ uctxt->urgent = 0;
+ uctxt->urgent_poll = 0;
+
+ /*
+ * Now enable the ctxt for receive.
+ * For chips that are set to DMA the tail register to memory
+ * when they change (and when the update bit transitions from
+ * 0 to 1. So for those chips, we turn it off and then back on.
+ * This will (very briefly) affect any other open ctxts, but the
+ * duration is very short, and therefore isn't an issue. We
+ * explicitly set the in-memory tail copy to 0 beforehand, so we
+ * don't have to wait to be sure the DMA update has happened
+ * (chip resets head/tail to 0 on transition to enable).
+ */
+ if (uctxt->rcvhdrtail_kvaddr)
+ clear_rcvhdrtail(uctxt);
+
+ /* Setup J_KEY before enabling the context */
+ hfi1_set_ctxt_jkey(uctxt->dd, uctxt, uctxt->jkey);
+
+ rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB;
+ rcvctrl_ops |= HFI1_RCVCTRL_URGENT_ENB;
+ if (HFI1_CAP_UGET_MASK(uctxt->flags, HDRSUPP))
+ rcvctrl_ops |= HFI1_RCVCTRL_TIDFLOW_ENB;
+ /*
+ * Ignore the bit in the flags for now until proper
+ * support for multiple packet per rcv array entry is
+ * added.
+ */
+ if (!HFI1_CAP_UGET_MASK(uctxt->flags, MULTI_PKT_EGR))
+ rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
+ if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_EGR_FULL))
+ rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
+ if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
+ rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
+ /*
+ * The RcvCtxtCtrl.TailUpd bit has to be explicitly written.
+ * We can't rely on the correct value to be set from prior
+ * uses of the chip or ctxt. Therefore, add the rcvctrl op
+ * for both cases.
+ */
+ if (HFI1_CAP_UGET_MASK(uctxt->flags, DMA_RTAIL))
+ rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;
+ else
+ rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_DIS;
+ hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt);
+}
+
+static int get_ctxt_info(struct hfi1_filedata *fd, unsigned long arg, u32 len)
+{
+ struct hfi1_ctxt_info cinfo;
+ struct hfi1_ctxtdata *uctxt = fd->uctxt;
+
+ if (sizeof(cinfo) != len)
+ return -EINVAL;
+
+ memset(&cinfo, 0, sizeof(cinfo));
+ cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) &
+ HFI1_CAP_MISC_MASK) << HFI1_CAP_USER_SHIFT) |
+ HFI1_CAP_UGET_MASK(uctxt->flags, MASK) |
+ HFI1_CAP_KGET_MASK(uctxt->flags, K2U);
+ /* adjust flag if this fd is not able to cache */
+ if (!fd->handler)
+ cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */
+
+ cinfo.num_active = hfi1_count_active_units();
+ cinfo.unit = uctxt->dd->unit;
+ cinfo.ctxt = uctxt->ctxt;
+ cinfo.subctxt = fd->subctxt;
+ cinfo.rcvtids = roundup(uctxt->egrbufs.alloced,
+ uctxt->dd->rcv_entries.group_size) +
+ uctxt->expected_count;
+ cinfo.credits = uctxt->sc->credits;
+ cinfo.numa_node = uctxt->numa_id;
+ cinfo.rec_cpu = fd->rec_cpu_num;
+ cinfo.send_ctxt = uctxt->sc->hw_context;
+
+ cinfo.egrtids = uctxt->egrbufs.alloced;
+ cinfo.rcvhdrq_cnt = uctxt->rcvhdrq_cnt;
+ cinfo.rcvhdrq_entsize = uctxt->rcvhdrqentsize << 2;
+ cinfo.sdma_ring_size = fd->cq->nentries;
+ cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size;
+
+ trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, fd->subctxt, &cinfo);
+ if (copy_to_user((void __user *)arg, &cinfo, len))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int init_user_ctxt(struct hfi1_filedata *fd,
+ struct hfi1_ctxtdata *uctxt)
+{
+ int ret;
+
+ ret = hfi1_user_sdma_alloc_queues(uctxt, fd);
+ if (ret)
+ return ret;
+
+ ret = hfi1_user_exp_rcv_init(fd, uctxt);
+ if (ret)
+ hfi1_user_sdma_free_queues(fd, uctxt);
+
+ return ret;
+}
+
+static int setup_base_ctxt(struct hfi1_filedata *fd,
+ struct hfi1_ctxtdata *uctxt)
+{
+ struct hfi1_devdata *dd = uctxt->dd;
+ int ret = 0;
+
+ hfi1_init_ctxt(uctxt->sc);
+
+ /* Now allocate the RcvHdr queue and eager buffers. */
+ ret = hfi1_create_rcvhdrq(dd, uctxt);
+ if (ret)
+ goto done;
+
+ ret = hfi1_setup_eagerbufs(uctxt);
+ if (ret)
+ goto done;
+
+ /* If sub-contexts are enabled, do the appropriate setup */
+ if (uctxt->subctxt_cnt)
+ ret = setup_subctxt(uctxt);
+ if (ret)
+ goto done;
+
+ ret = hfi1_alloc_ctxt_rcv_groups(uctxt);
+ if (ret)
+ goto done;
+
+ ret = init_user_ctxt(fd, uctxt);
+ if (ret) {
+ hfi1_free_ctxt_rcv_groups(uctxt);
+ goto done;
+ }
+
+ user_init(uctxt);
+
+ /* Now that the context is set up, the fd can get a reference. */
+ fd->uctxt = uctxt;
+ hfi1_rcd_get(uctxt);
+
+done:
+ if (uctxt->subctxt_cnt) {
+ /*
+ * On error, set the failed bit so sub-contexts will clean up
+ * correctly.
+ */
+ if (ret)
+ set_bit(HFI1_CTXT_BASE_FAILED, &uctxt->event_flags);
+
+ /*
+ * Base context is done (successfully or not), notify anybody
+ * using a sub-context that is waiting for this completion.
+ */
+ clear_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
+ wake_up(&uctxt->wait);
+ }
+
+ return ret;
+}
+
+static int get_base_info(struct hfi1_filedata *fd, unsigned long arg, u32 len)
+{
+ struct hfi1_base_info binfo;
+ struct hfi1_ctxtdata *uctxt = fd->uctxt;
+ struct hfi1_devdata *dd = uctxt->dd;
+ unsigned offset;
+
+ trace_hfi1_uctxtdata(uctxt->dd, uctxt, fd->subctxt);
+
+ if (sizeof(binfo) != len)
+ return -EINVAL;
+
+ memset(&binfo, 0, sizeof(binfo));
+ binfo.hw_version = dd->revision;
+ binfo.sw_version = HFI1_KERN_SWVERSION;
+ binfo.bthqp = kdeth_qp;
+ binfo.jkey = uctxt->jkey;
+ /*
+ * If more than 64 contexts are enabled the allocated credit
+ * return will span two or three contiguous pages. Since we only
+ * map the page containing the context's credit return address,
+ * we need to calculate the offset in the proper page.
+ */
+ offset = ((u64)uctxt->sc->hw_free -
+ (u64)dd->cr_base[uctxt->numa_id].va) % PAGE_SIZE;
+ binfo.sc_credits_addr = HFI1_MMAP_TOKEN(PIO_CRED, uctxt->ctxt,
+ fd->subctxt, offset);
+ binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt,
+ fd->subctxt,
+ uctxt->sc->base_addr);
+ binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP,
+ uctxt->ctxt,
+ fd->subctxt,
+ uctxt->sc->base_addr);
+ binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt,
+ fd->subctxt,
+ uctxt->rcvhdrq);
+ binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt,
+ fd->subctxt,
+ uctxt->egrbufs.rcvtids[0].dma);
+ binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt,
+ fd->subctxt, 0);
+ /*
+ * user regs are at
+ * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE))
+ */
+ binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt,
+ fd->subctxt, 0);
+ offset = offset_in_page((uctxt_offset(uctxt) + fd->subctxt) *
+ sizeof(*dd->events));
+ binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt,
+ fd->subctxt,
+ offset);
+ binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt,
+ fd->subctxt,
+ dd->status);
+ if (HFI1_CAP_IS_USET(DMA_RTAIL))
+ binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt,
+ fd->subctxt, 0);
+ if (uctxt->subctxt_cnt) {
+ binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS,
+ uctxt->ctxt,
+ fd->subctxt, 0);
+ binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ,
+ uctxt->ctxt,
+ fd->subctxt, 0);
+ binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF,
+ uctxt->ctxt,
+ fd->subctxt, 0);
+ }
+
+ if (copy_to_user((void __user *)arg, &binfo, len))
+ return -EFAULT;
+
+ return 0;
+}
+
+/**
+ * user_exp_rcv_setup - Set up the given tid rcv list
+ * @fd: file data of the current driver instance
+ * @arg: ioctl argumnent for user space information
+ * @len: length of data structure associated with ioctl command
+ *
+ * Wrapper to validate ioctl information before doing _rcv_setup.
+ *
+ */
+static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg,
+ u32 len)
+{
+ int ret;
+ unsigned long addr;
+ struct hfi1_tid_info tinfo;
+
+ if (sizeof(tinfo) != len)
+ return -EINVAL;
+
+ if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
+ return -EFAULT;
+
+ ret = hfi1_user_exp_rcv_setup(fd, &tinfo);
+ if (!ret) {
+ /*
+ * Copy the number of tidlist entries we used
+ * and the length of the buffer we registered.
+ */
+ addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
+ if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
+ sizeof(tinfo.tidcnt)))
+ ret = -EFAULT;
+
+ addr = arg + offsetof(struct hfi1_tid_info, length);
+ if (!ret && copy_to_user((void __user *)addr, &tinfo.length,
+ sizeof(tinfo.length)))
+ ret = -EFAULT;
+
+ if (ret)
+ hfi1_user_exp_rcv_invalid(fd, &tinfo);
+ }
+
+ return ret;
+}
+
+/**
+ * user_exp_rcv_clear - Clear the given tid rcv list
+ * @fd: file data of the current driver instance
+ * @arg: ioctl argumnent for user space information
+ * @len: length of data structure associated with ioctl command
+ *
+ * The hfi1_user_exp_rcv_clear() can be called from the error path. Because
+ * of this, we need to use this wrapper to copy the user space information
+ * before doing the clear.
+ */
+static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg,
+ u32 len)
+{
+ int ret;
+ unsigned long addr;
+ struct hfi1_tid_info tinfo;
+
+ if (sizeof(tinfo) != len)
+ return -EINVAL;
+
+ if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
+ return -EFAULT;
+
+ ret = hfi1_user_exp_rcv_clear(fd, &tinfo);
+ if (!ret) {
+ addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
+ if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
+ sizeof(tinfo.tidcnt)))
+ return -EFAULT;
+ }
+
+ return ret;
+}
+
+/**
+ * user_exp_rcv_invalid - Invalidate the given tid rcv list
+ * @fd: file data of the current driver instance
+ * @arg: ioctl argumnent for user space information
+ * @len: length of data structure associated with ioctl command
+ *
+ * Wrapper to validate ioctl information before doing _rcv_invalid.
+ *
+ */
+static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg,
+ u32 len)
+{
+ int ret;
+ unsigned long addr;
+ struct hfi1_tid_info tinfo;
+
+ if (sizeof(tinfo) != len)
+ return -EINVAL;
+
+ if (!fd->invalid_tids)
+ return -EINVAL;
+
+ if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
+ return -EFAULT;
+
+ ret = hfi1_user_exp_rcv_invalid(fd, &tinfo);
+ if (ret)
+ return ret;
+
+ addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
+ if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
+ sizeof(tinfo.tidcnt)))
+ ret = -EFAULT;
+
+ return ret;
+}
+
+static __poll_t poll_urgent(struct file *fp,
+ struct poll_table_struct *pt)
+{
+ struct hfi1_filedata *fd = fp->private_data;
+ struct hfi1_ctxtdata *uctxt = fd->uctxt;
+ struct hfi1_devdata *dd = uctxt->dd;
+ __poll_t pollflag;
+
+ poll_wait(fp, &uctxt->wait, pt);
+
+ spin_lock_irq(&dd->uctxt_lock);
+ if (uctxt->urgent != uctxt->urgent_poll) {
+ pollflag = EPOLLIN | EPOLLRDNORM;
+ uctxt->urgent_poll = uctxt->urgent;
+ } else {
+ pollflag = 0;
+ set_bit(HFI1_CTXT_WAITING_URG, &uctxt->event_flags);
+ }
+ spin_unlock_irq(&dd->uctxt_lock);
+
+ return pollflag;
+}
+
+static __poll_t poll_next(struct file *fp,
+ struct poll_table_struct *pt)
+{
+ struct hfi1_filedata *fd = fp->private_data;
+ struct hfi1_ctxtdata *uctxt = fd->uctxt;
+ struct hfi1_devdata *dd = uctxt->dd;
+ __poll_t pollflag;
+
+ poll_wait(fp, &uctxt->wait, pt);
+
+ spin_lock_irq(&dd->uctxt_lock);
+ if (hdrqempty(uctxt)) {
+ set_bit(HFI1_CTXT_WAITING_RCV, &uctxt->event_flags);
+ hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_ENB, uctxt);
+ pollflag = 0;
+ } else {
+ pollflag = EPOLLIN | EPOLLRDNORM;
+ }
+ spin_unlock_irq(&dd->uctxt_lock);
+
+ return pollflag;
+}
+
+/*
+ * Find all user contexts in use, and set the specified bit in their
+ * event mask.
+ * See also find_ctxt() for a similar use, that is specific to send buffers.
+ */
+int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit)
+{
+ struct hfi1_ctxtdata *uctxt;
+ struct hfi1_devdata *dd = ppd->dd;
+ u16 ctxt;
+
+ if (!dd->events)
+ return -EINVAL;
+
+ for (ctxt = dd->first_dyn_alloc_ctxt; ctxt < dd->num_rcv_contexts;
+ ctxt++) {
+ uctxt = hfi1_rcd_get_by_index(dd, ctxt);
+ if (uctxt) {
+ unsigned long *evs;
+ int i;
+ /*
+ * subctxt_cnt is 0 if not shared, so do base
+ * separately, first, then remaining subctxt, if any
+ */
+ evs = dd->events + uctxt_offset(uctxt);
+ set_bit(evtbit, evs);
+ for (i = 1; i < uctxt->subctxt_cnt; i++)
+ set_bit(evtbit, evs + i);
+ hfi1_rcd_put(uctxt);
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * manage_rcvq - manage a context's receive queue
+ * @uctxt: the context
+ * @subctxt: the sub-context
+ * @start_stop: action to carry out
+ *
+ * start_stop == 0 disables receive on the context, for use in queue
+ * overflow conditions. start_stop==1 re-enables, to be used to
+ * re-init the software copy of the head register
+ */
+static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt,
+ unsigned long arg)
+{
+ struct hfi1_devdata *dd = uctxt->dd;
+ unsigned int rcvctrl_op;
+ int start_stop;
+
+ if (subctxt)
+ return 0;
+
+ if (get_user(start_stop, (int __user *)arg))
+ return -EFAULT;
+
+ /* atomically clear receive enable ctxt. */
+ if (start_stop) {
+ /*
+ * On enable, force in-memory copy of the tail register to
+ * 0, so that protocol code doesn't have to worry about
+ * whether or not the chip has yet updated the in-memory
+ * copy or not on return from the system call. The chip
+ * always resets it's tail register back to 0 on a
+ * transition from disabled to enabled.
+ */
+ if (uctxt->rcvhdrtail_kvaddr)
+ clear_rcvhdrtail(uctxt);
+ rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB;
+ } else {
+ rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS;
+ }
+ hfi1_rcvctrl(dd, rcvctrl_op, uctxt);
+ /* always; new head should be equal to new tail; see above */
+
+ return 0;
+}
+
+/*
+ * clear the event notifier events for this context.
+ * User process then performs actions appropriate to bit having been
+ * set, if desired, and checks again in future.
+ */
+static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt,
+ unsigned long arg)
+{
+ int i;
+ struct hfi1_devdata *dd = uctxt->dd;
+ unsigned long *evs;
+ unsigned long events;
+
+ if (!dd->events)
+ return 0;
+
+ if (get_user(events, (unsigned long __user *)arg))
+ return -EFAULT;
+
+ evs = dd->events + uctxt_offset(uctxt) + subctxt;
+
+ for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) {
+ if (!test_bit(i, &events))
+ continue;
+ clear_bit(i, evs);
+ }
+ return 0;
+}
+
+static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg)
+{
+ int i;
+ struct hfi1_pportdata *ppd = uctxt->ppd;
+ struct hfi1_devdata *dd = uctxt->dd;
+ u16 pkey;
+
+ if (!HFI1_CAP_IS_USET(PKEY_CHECK))
+ return -EPERM;
+
+ if (get_user(pkey, (u16 __user *)arg))
+ return -EFAULT;
+
+ if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++)
+ if (pkey == ppd->pkeys[i])
+ return hfi1_set_ctxt_pkey(dd, uctxt, pkey);
+
+ return -ENOENT;
+}
+
+/**
+ * ctxt_reset - Reset the user context
+ * @uctxt: valid user context
+ */
+static int ctxt_reset(struct hfi1_ctxtdata *uctxt)
+{
+ struct send_context *sc;
+ struct hfi1_devdata *dd;
+ int ret = 0;
+
+ if (!uctxt || !uctxt->dd || !uctxt->sc)
+ return -EINVAL;
+
+ /*
+ * There is no protection here. User level has to guarantee that
+ * no one will be writing to the send context while it is being
+ * re-initialized. If user level breaks that guarantee, it will
+ * break it's own context and no one else's.
+ */
+ dd = uctxt->dd;
+ sc = uctxt->sc;
+
+ /*
+ * Wait until the interrupt handler has marked the context as
+ * halted or frozen. Report error if we time out.
+ */
+ wait_event_interruptible_timeout(
+ sc->halt_wait, (sc->flags & SCF_HALTED),
+ msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
+ if (!(sc->flags & SCF_HALTED))
+ return -ENOLCK;
+
+ /*
+ * If the send context was halted due to a Freeze, wait until the
+ * device has been "unfrozen" before resetting the context.
+ */
+ if (sc->flags & SCF_FROZEN) {
+ wait_event_interruptible_timeout(
+ dd->event_queue,
+ !(READ_ONCE(dd->flags) & HFI1_FROZEN),
+ msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
+ if (dd->flags & HFI1_FROZEN)
+ return -ENOLCK;
+
+ if (dd->flags & HFI1_FORCED_FREEZE)
+ /*
+ * Don't allow context reset if we are into
+ * forced freeze
+ */
+ return -ENODEV;
+
+ sc_disable(sc);
+ ret = sc_enable(sc);
+ hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_ENB, uctxt);
+ } else {
+ ret = sc_restart(sc);
+ }
+ if (!ret)
+ sc_return_credits(sc);
+
+ return ret;
+}
+
+static void user_remove(struct hfi1_devdata *dd)
+{
+
+ hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device);
+}
+
+static int user_add(struct hfi1_devdata *dd)
+{
+ char name[10];
+ int ret;
+
+ snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit);
+ ret = hfi1_cdev_init(dd->unit, name, &hfi1_file_ops,
+ &dd->user_cdev, &dd->user_device,
+ true, &dd->kobj);
+ if (ret)
+ user_remove(dd);
+
+ return ret;
+}
+
+/*
+ * Create per-unit files in /dev
+ */
+int hfi1_device_create(struct hfi1_devdata *dd)
+{
+ return user_add(dd);
+}
+
+/*
+ * Remove per-unit files in /dev
+ * void, core kernel returns no errors for this stuff
+ */
+void hfi1_device_remove(struct hfi1_devdata *dd)
+{
+ user_remove(dd);
+}