--- /dev/null
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * 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. See the GNU
+ * General Public License for more details.
+ *
+ * Intel SCIF driver.
+ *
+ */
+#include "scif_main.h"
+
+/*
+ * struct scif_vma_info - Information about a remote memory mapping
+ * created via scif_mmap(..)
+ * @vma: VM area struct
+ * @list: link to list of active vmas
+ */
+struct scif_vma_info {
+ struct vm_area_struct *vma;
+ struct list_head list;
+};
+
+void scif_recv_munmap(struct scif_dev *scifdev, struct scifmsg *msg)
+{
+ struct scif_rma_req req;
+ struct scif_window *window = NULL;
+ struct scif_window *recv_window =
+ (struct scif_window *)msg->payload[0];
+ struct scif_endpt *ep;
+
+ ep = (struct scif_endpt *)recv_window->ep;
+ req.out_window = &window;
+ req.offset = recv_window->offset;
+ req.prot = recv_window->prot;
+ req.nr_bytes = recv_window->nr_pages << PAGE_SHIFT;
+ req.type = SCIF_WINDOW_FULL;
+ req.head = &ep->rma_info.reg_list;
+ msg->payload[0] = ep->remote_ep;
+
+ mutex_lock(&ep->rma_info.rma_lock);
+ /* Does a valid window exist? */
+ if (scif_query_window(&req)) {
+ dev_err(&scifdev->sdev->dev,
+ "%s %d -ENXIO\n", __func__, __LINE__);
+ msg->uop = SCIF_UNREGISTER_ACK;
+ goto error;
+ }
+
+ scif_put_window(window, window->nr_pages);
+
+ if (!window->ref_count) {
+ atomic_inc(&ep->rma_info.tw_refcount);
+ ep->rma_info.async_list_del = 1;
+ list_del_init(&window->list);
+ scif_free_window_offset(ep, window, window->offset);
+ }
+error:
+ mutex_unlock(&ep->rma_info.rma_lock);
+ if (window && !window->ref_count)
+ scif_queue_for_cleanup(window, &scif_info.rma);
+}
+
+/*
+ * Remove valid remote memory mappings created via scif_mmap(..) from the
+ * process address space since the remote node is lost
+ */
+static void __scif_zap_mmaps(struct scif_endpt *ep)
+{
+ struct list_head *item;
+ struct scif_vma_info *info;
+ struct vm_area_struct *vma;
+ unsigned long size;
+
+ spin_lock(&ep->lock);
+ list_for_each(item, &ep->rma_info.vma_list) {
+ info = list_entry(item, struct scif_vma_info, list);
+ vma = info->vma;
+ size = vma->vm_end - vma->vm_start;
+ zap_vma_ptes(vma, vma->vm_start, size);
+ dev_dbg(scif_info.mdev.this_device,
+ "%s ep %p zap vma %p size 0x%lx\n",
+ __func__, ep, info->vma, size);
+ }
+ spin_unlock(&ep->lock);
+}
+
+/*
+ * Traverse the list of endpoints for a particular remote node and
+ * zap valid remote memory mappings since the remote node is lost
+ */
+static void _scif_zap_mmaps(int node, struct list_head *head)
+{
+ struct scif_endpt *ep;
+ struct list_head *item;
+
+ mutex_lock(&scif_info.connlock);
+ list_for_each(item, head) {
+ ep = list_entry(item, struct scif_endpt, list);
+ if (ep->remote_dev->node == node)
+ __scif_zap_mmaps(ep);
+ }
+ mutex_unlock(&scif_info.connlock);
+}
+
+/*
+ * Wrapper for removing remote memory mappings for a particular node. This API
+ * is called by peer nodes as part of handling a lost node.
+ */
+void scif_zap_mmaps(int node)
+{
+ _scif_zap_mmaps(node, &scif_info.connected);
+ _scif_zap_mmaps(node, &scif_info.disconnected);
+}
+
+/*
+ * This API is only called while handling a lost node:
+ * a) Remote node is dead.
+ * b) Remote memory mappings have been zapped
+ * So we can traverse the remote_reg_list without any locks. Since
+ * the window has not yet been unregistered we can drop the ref count
+ * and queue it to the cleanup thread.
+ */
+static void __scif_cleanup_rma_for_zombies(struct scif_endpt *ep)
+{
+ struct list_head *pos, *tmp;
+ struct scif_window *window;
+
+ list_for_each_safe(pos, tmp, &ep->rma_info.remote_reg_list) {
+ window = list_entry(pos, struct scif_window, list);
+ if (window->ref_count)
+ scif_put_window(window, window->nr_pages);
+ else
+ dev_err(scif_info.mdev.this_device,
+ "%s %d unexpected\n",
+ __func__, __LINE__);
+ if (!window->ref_count) {
+ atomic_inc(&ep->rma_info.tw_refcount);
+ list_del_init(&window->list);
+ scif_queue_for_cleanup(window, &scif_info.rma);
+ }
+ }
+}
+
+/* Cleanup remote registration lists for zombie endpoints */
+void scif_cleanup_rma_for_zombies(int node)
+{
+ struct scif_endpt *ep;
+ struct list_head *item;
+
+ mutex_lock(&scif_info.eplock);
+ list_for_each(item, &scif_info.zombie) {
+ ep = list_entry(item, struct scif_endpt, list);
+ if (ep->remote_dev && ep->remote_dev->node == node)
+ __scif_cleanup_rma_for_zombies(ep);
+ }
+ mutex_unlock(&scif_info.eplock);
+ flush_work(&scif_info.misc_work);
+}
+
+/* Insert the VMA into the per endpoint VMA list */
+static int scif_insert_vma(struct scif_endpt *ep, struct vm_area_struct *vma)
+{
+ struct scif_vma_info *info;
+ int err = 0;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ err = -ENOMEM;
+ goto done;
+ }
+ info->vma = vma;
+ spin_lock(&ep->lock);
+ list_add_tail(&info->list, &ep->rma_info.vma_list);
+ spin_unlock(&ep->lock);
+done:
+ return err;
+}
+
+/* Delete the VMA from the per endpoint VMA list */
+static void scif_delete_vma(struct scif_endpt *ep, struct vm_area_struct *vma)
+{
+ struct list_head *item;
+ struct scif_vma_info *info;
+
+ spin_lock(&ep->lock);
+ list_for_each(item, &ep->rma_info.vma_list) {
+ info = list_entry(item, struct scif_vma_info, list);
+ if (info->vma == vma) {
+ list_del(&info->list);
+ kfree(info);
+ break;
+ }
+ }
+ spin_unlock(&ep->lock);
+}
+
+static phys_addr_t scif_get_phys(phys_addr_t phys, struct scif_endpt *ep)
+{
+ struct scif_dev *scifdev = (struct scif_dev *)ep->remote_dev;
+ struct scif_hw_dev *sdev = scifdev->sdev;
+ phys_addr_t out_phys, apt_base = 0;
+
+ /*
+ * If the DMA address is card relative then we need to add the
+ * aperture base for mmap to work correctly
+ */
+ if (!scifdev_self(scifdev) && sdev->aper && sdev->card_rel_da)
+ apt_base = sdev->aper->pa;
+ out_phys = apt_base + phys;
+ return out_phys;
+}
+
+int scif_get_pages(scif_epd_t epd, off_t offset, size_t len,
+ struct scif_range **pages)
+{
+ struct scif_endpt *ep = (struct scif_endpt *)epd;
+ struct scif_rma_req req;
+ struct scif_window *window = NULL;
+ int nr_pages, err, i;
+
+ dev_dbg(scif_info.mdev.this_device,
+ "SCIFAPI get_pinned_pages: ep %p offset 0x%lx len 0x%lx\n",
+ ep, offset, len);
+ err = scif_verify_epd(ep);
+ if (err)
+ return err;
+
+ if (!len || (offset < 0) ||
+ (offset + len < offset) ||
+ (ALIGN(offset, PAGE_SIZE) != offset) ||
+ (ALIGN(len, PAGE_SIZE) != len))
+ return -EINVAL;
+
+ nr_pages = len >> PAGE_SHIFT;
+
+ req.out_window = &window;
+ req.offset = offset;
+ req.prot = 0;
+ req.nr_bytes = len;
+ req.type = SCIF_WINDOW_SINGLE;
+ req.head = &ep->rma_info.remote_reg_list;
+
+ mutex_lock(&ep->rma_info.rma_lock);
+ /* Does a valid window exist? */
+ err = scif_query_window(&req);
+ if (err) {
+ dev_err(&ep->remote_dev->sdev->dev,
+ "%s %d err %d\n", __func__, __LINE__, err);
+ goto error;
+ }
+
+ /* Allocate scif_range */
+ *pages = kzalloc(sizeof(**pages), GFP_KERNEL);
+ if (!*pages) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ /* Allocate phys addr array */
+ (*pages)->phys_addr = scif_zalloc(nr_pages * sizeof(dma_addr_t));
+ if (!((*pages)->phys_addr)) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ if (scif_is_mgmt_node() && !scifdev_self(ep->remote_dev)) {
+ /* Allocate virtual address array */
+ ((*pages)->va = scif_zalloc(nr_pages * sizeof(void *)));
+ if (!(*pages)->va) {
+ err = -ENOMEM;
+ goto error;
+ }
+ }
+ /* Populate the values */
+ (*pages)->cookie = window;
+ (*pages)->nr_pages = nr_pages;
+ (*pages)->prot_flags = window->prot;
+
+ for (i = 0; i < nr_pages; i++) {
+ (*pages)->phys_addr[i] =
+ __scif_off_to_dma_addr(window, offset +
+ (i * PAGE_SIZE));
+ (*pages)->phys_addr[i] = scif_get_phys((*pages)->phys_addr[i],
+ ep);
+ if (scif_is_mgmt_node() && !scifdev_self(ep->remote_dev))
+ (*pages)->va[i] =
+ ep->remote_dev->sdev->aper->va +
+ (*pages)->phys_addr[i] -
+ ep->remote_dev->sdev->aper->pa;
+ }
+
+ scif_get_window(window, nr_pages);
+error:
+ mutex_unlock(&ep->rma_info.rma_lock);
+ if (err) {
+ if (*pages) {
+ scif_free((*pages)->phys_addr,
+ nr_pages * sizeof(dma_addr_t));
+ scif_free((*pages)->va,
+ nr_pages * sizeof(void *));
+ kfree(*pages);
+ *pages = NULL;
+ }
+ dev_err(&ep->remote_dev->sdev->dev,
+ "%s %d err %d\n", __func__, __LINE__, err);
+ }
+ return err;
+}
+EXPORT_SYMBOL_GPL(scif_get_pages);
+
+int scif_put_pages(struct scif_range *pages)
+{
+ struct scif_endpt *ep;
+ struct scif_window *window;
+ struct scifmsg msg;
+
+ if (!pages || !pages->cookie)
+ return -EINVAL;
+
+ window = pages->cookie;
+
+ if (!window || window->magic != SCIFEP_MAGIC)
+ return -EINVAL;
+
+ ep = (struct scif_endpt *)window->ep;
+ /*
+ * If the state is SCIFEP_CONNECTED or SCIFEP_DISCONNECTED then the
+ * callee should be allowed to release references to the pages,
+ * else the endpoint was not connected in the first place,
+ * hence the ENOTCONN.
+ */
+ if (ep->state != SCIFEP_CONNECTED && ep->state != SCIFEP_DISCONNECTED)
+ return -ENOTCONN;
+
+ mutex_lock(&ep->rma_info.rma_lock);
+
+ scif_put_window(window, pages->nr_pages);
+
+ /* Initiate window destruction if ref count is zero */
+ if (!window->ref_count) {
+ list_del(&window->list);
+ mutex_unlock(&ep->rma_info.rma_lock);
+ scif_drain_dma_intr(ep->remote_dev->sdev,
+ ep->rma_info.dma_chan);
+ /* Inform the peer about this window being destroyed. */
+ msg.uop = SCIF_MUNMAP;
+ msg.src = ep->port;
+ msg.payload[0] = window->peer_window;
+ /* No error handling for notification messages */
+ scif_nodeqp_send(ep->remote_dev, &msg);
+ /* Destroy this window from the peer's registered AS */
+ scif_destroy_remote_window(window);
+ } else {
+ mutex_unlock(&ep->rma_info.rma_lock);
+ }
+
+ scif_free(pages->phys_addr, pages->nr_pages * sizeof(dma_addr_t));
+ scif_free(pages->va, pages->nr_pages * sizeof(void *));
+ kfree(pages);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(scif_put_pages);
+
+/*
+ * scif_rma_list_mmap:
+ *
+ * Traverse the remote registration list starting from start_window:
+ * 1) Create VtoP mappings via remap_pfn_range(..)
+ * 2) Once step 1) and 2) complete successfully then traverse the range of
+ * windows again and bump the reference count.
+ * RMA lock must be held.
+ */
+static int scif_rma_list_mmap(struct scif_window *start_window, s64 offset,
+ int nr_pages, struct vm_area_struct *vma)
+{
+ s64 end_offset, loop_offset = offset;
+ struct scif_window *window = start_window;
+ int loop_nr_pages, nr_pages_left = nr_pages;
+ struct scif_endpt *ep = (struct scif_endpt *)start_window->ep;
+ struct list_head *head = &ep->rma_info.remote_reg_list;
+ int i, err = 0;
+ dma_addr_t phys_addr;
+ struct scif_window_iter src_win_iter;
+ size_t contig_bytes = 0;
+
+ might_sleep();
+ list_for_each_entry_from(window, head, list) {
+ end_offset = window->offset +
+ (window->nr_pages << PAGE_SHIFT);
+ loop_nr_pages = min_t(int,
+ (end_offset - loop_offset) >> PAGE_SHIFT,
+ nr_pages_left);
+ scif_init_window_iter(window, &src_win_iter);
+ for (i = 0; i < loop_nr_pages; i++) {
+ phys_addr = scif_off_to_dma_addr(window, loop_offset,
+ &contig_bytes,
+ &src_win_iter);
+ phys_addr = scif_get_phys(phys_addr, ep);
+ err = remap_pfn_range(vma,
+ vma->vm_start +
+ loop_offset - offset,
+ phys_addr >> PAGE_SHIFT,
+ PAGE_SIZE,
+ vma->vm_page_prot);
+ if (err)
+ goto error;
+ loop_offset += PAGE_SIZE;
+ }
+ nr_pages_left -= loop_nr_pages;
+ if (!nr_pages_left)
+ break;
+ }
+ /*
+ * No more failures expected. Bump up the ref count for all
+ * the windows. Another traversal from start_window required
+ * for handling errors encountered across windows during
+ * remap_pfn_range(..).
+ */
+ loop_offset = offset;
+ nr_pages_left = nr_pages;
+ window = start_window;
+ head = &ep->rma_info.remote_reg_list;
+ list_for_each_entry_from(window, head, list) {
+ end_offset = window->offset +
+ (window->nr_pages << PAGE_SHIFT);
+ loop_nr_pages = min_t(int,
+ (end_offset - loop_offset) >> PAGE_SHIFT,
+ nr_pages_left);
+ scif_get_window(window, loop_nr_pages);
+ nr_pages_left -= loop_nr_pages;
+ loop_offset += (loop_nr_pages << PAGE_SHIFT);
+ if (!nr_pages_left)
+ break;
+ }
+error:
+ if (err)
+ dev_err(scif_info.mdev.this_device,
+ "%s %d err %d\n", __func__, __LINE__, err);
+ return err;
+}
+
+/*
+ * scif_rma_list_munmap:
+ *
+ * Traverse the remote registration list starting from window:
+ * 1) Decrement ref count.
+ * 2) If the ref count drops to zero then send a SCIF_MUNMAP message to peer.
+ * RMA lock must be held.
+ */
+static void scif_rma_list_munmap(struct scif_window *start_window,
+ s64 offset, int nr_pages)
+{
+ struct scifmsg msg;
+ s64 loop_offset = offset, end_offset;
+ int loop_nr_pages, nr_pages_left = nr_pages;
+ struct scif_endpt *ep = (struct scif_endpt *)start_window->ep;
+ struct list_head *head = &ep->rma_info.remote_reg_list;
+ struct scif_window *window = start_window, *_window;
+
+ msg.uop = SCIF_MUNMAP;
+ msg.src = ep->port;
+ loop_offset = offset;
+ nr_pages_left = nr_pages;
+ list_for_each_entry_safe_from(window, _window, head, list) {
+ end_offset = window->offset +
+ (window->nr_pages << PAGE_SHIFT);
+ loop_nr_pages = min_t(int,
+ (end_offset - loop_offset) >> PAGE_SHIFT,
+ nr_pages_left);
+ scif_put_window(window, loop_nr_pages);
+ if (!window->ref_count) {
+ struct scif_dev *rdev = ep->remote_dev;
+
+ scif_drain_dma_intr(rdev->sdev,
+ ep->rma_info.dma_chan);
+ /* Inform the peer about this munmap */
+ msg.payload[0] = window->peer_window;
+ /* No error handling for Notification messages. */
+ scif_nodeqp_send(ep->remote_dev, &msg);
+ list_del(&window->list);
+ /* Destroy this window from the peer's registered AS */
+ scif_destroy_remote_window(window);
+ }
+ nr_pages_left -= loop_nr_pages;
+ loop_offset += (loop_nr_pages << PAGE_SHIFT);
+ if (!nr_pages_left)
+ break;
+ }
+}
+
+/*
+ * The private data field of each VMA used to mmap a remote window
+ * points to an instance of struct vma_pvt
+ */
+struct vma_pvt {
+ struct scif_endpt *ep; /* End point for remote window */
+ s64 offset; /* offset within remote window */
+ bool valid_offset; /* offset is valid only if the original
+ * mmap request was for a single page
+ * else the offset within the vma is
+ * the correct offset
+ */
+ struct kref ref;
+};
+
+static void vma_pvt_release(struct kref *ref)
+{
+ struct vma_pvt *vmapvt = container_of(ref, struct vma_pvt, ref);
+
+ kfree(vmapvt);
+}
+
+/**
+ * scif_vma_open - VMA open driver callback
+ * @vma: VMM memory area.
+ * The open method is called by the kernel to allow the subsystem implementing
+ * the VMA to initialize the area. This method is invoked any time a new
+ * reference to the VMA is made (when a process forks, for example).
+ * The one exception happens when the VMA is first created by mmap;
+ * in this case, the driver's mmap method is called instead.
+ * This function is also invoked when an existing VMA is split by the kernel
+ * due to a call to munmap on a subset of the VMA resulting in two VMAs.
+ * The kernel invokes this function only on one of the two VMAs.
+ */
+static void scif_vma_open(struct vm_area_struct *vma)
+{
+ struct vma_pvt *vmapvt = vma->vm_private_data;
+
+ dev_dbg(scif_info.mdev.this_device,
+ "SCIFAPI vma open: vma_start 0x%lx vma_end 0x%lx\n",
+ vma->vm_start, vma->vm_end);
+ scif_insert_vma(vmapvt->ep, vma);
+ kref_get(&vmapvt->ref);
+}
+
+/**
+ * scif_munmap - VMA close driver callback.
+ * @vma: VMM memory area.
+ * When an area is destroyed, the kernel calls its close operation.
+ * Note that there's no usage count associated with VMA's; the area
+ * is opened and closed exactly once by each process that uses it.
+ */
+static void scif_munmap(struct vm_area_struct *vma)
+{
+ struct scif_endpt *ep;
+ struct vma_pvt *vmapvt = vma->vm_private_data;
+ int nr_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+ s64 offset;
+ struct scif_rma_req req;
+ struct scif_window *window = NULL;
+ int err;
+
+ might_sleep();
+ dev_dbg(scif_info.mdev.this_device,
+ "SCIFAPI munmap: vma_start 0x%lx vma_end 0x%lx\n",
+ vma->vm_start, vma->vm_end);
+ ep = vmapvt->ep;
+ offset = vmapvt->valid_offset ? vmapvt->offset :
+ (vma->vm_pgoff) << PAGE_SHIFT;
+ dev_dbg(scif_info.mdev.this_device,
+ "SCIFAPI munmap: ep %p nr_pages 0x%x offset 0x%llx\n",
+ ep, nr_pages, offset);
+ req.out_window = &window;
+ req.offset = offset;
+ req.nr_bytes = vma->vm_end - vma->vm_start;
+ req.prot = vma->vm_flags & (VM_READ | VM_WRITE);
+ req.type = SCIF_WINDOW_PARTIAL;
+ req.head = &ep->rma_info.remote_reg_list;
+
+ mutex_lock(&ep->rma_info.rma_lock);
+
+ err = scif_query_window(&req);
+ if (err)
+ dev_err(scif_info.mdev.this_device,
+ "%s %d err %d\n", __func__, __LINE__, err);
+ else
+ scif_rma_list_munmap(window, offset, nr_pages);
+
+ mutex_unlock(&ep->rma_info.rma_lock);
+ /*
+ * The kernel probably zeroes these out but we still want
+ * to clean up our own mess just in case.
+ */
+ vma->vm_ops = NULL;
+ vma->vm_private_data = NULL;
+ kref_put(&vmapvt->ref, vma_pvt_release);
+ scif_delete_vma(ep, vma);
+}
+
+static const struct vm_operations_struct scif_vm_ops = {
+ .open = scif_vma_open,
+ .close = scif_munmap,
+};
+
+/**
+ * scif_mmap - Map pages in virtual address space to a remote window.
+ * @vma: VMM memory area.
+ * @epd: endpoint descriptor
+ *
+ * Return: Upon successful completion, scif_mmap() returns zero
+ * else an apt error is returned as documented in scif.h
+ */
+int scif_mmap(struct vm_area_struct *vma, scif_epd_t epd)
+{
+ struct scif_rma_req req;
+ struct scif_window *window = NULL;
+ struct scif_endpt *ep = (struct scif_endpt *)epd;
+ s64 start_offset = vma->vm_pgoff << PAGE_SHIFT;
+ int nr_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+ int err;
+ struct vma_pvt *vmapvt;
+
+ dev_dbg(scif_info.mdev.this_device,
+ "SCIFAPI mmap: ep %p start_offset 0x%llx nr_pages 0x%x\n",
+ ep, start_offset, nr_pages);
+ err = scif_verify_epd(ep);
+ if (err)
+ return err;
+
+ might_sleep();
+
+ err = scif_insert_vma(ep, vma);
+ if (err)
+ return err;
+
+ vmapvt = kzalloc(sizeof(*vmapvt), GFP_KERNEL);
+ if (!vmapvt) {
+ scif_delete_vma(ep, vma);
+ return -ENOMEM;
+ }
+
+ vmapvt->ep = ep;
+ kref_init(&vmapvt->ref);
+
+ req.out_window = &window;
+ req.offset = start_offset;
+ req.nr_bytes = vma->vm_end - vma->vm_start;
+ req.prot = vma->vm_flags & (VM_READ | VM_WRITE);
+ req.type = SCIF_WINDOW_PARTIAL;
+ req.head = &ep->rma_info.remote_reg_list;
+
+ mutex_lock(&ep->rma_info.rma_lock);
+ /* Does a valid window exist? */
+ err = scif_query_window(&req);
+ if (err) {
+ dev_err(&ep->remote_dev->sdev->dev,
+ "%s %d err %d\n", __func__, __LINE__, err);
+ goto error_unlock;
+ }
+
+ /* Default prot for loopback */
+ if (!scifdev_self(ep->remote_dev))
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+
+ /*
+ * VM_DONTCOPY - Do not copy this vma on fork
+ * VM_DONTEXPAND - Cannot expand with mremap()
+ * VM_RESERVED - Count as reserved_vm like IO
+ * VM_PFNMAP - Page-ranges managed without "struct page"
+ * VM_IO - Memory mapped I/O or similar
+ *
+ * We do not want to copy this VMA automatically on a fork(),
+ * expand this VMA due to mremap() or swap out these pages since
+ * the VMA is actually backed by physical pages in the remote
+ * node's physical memory and not via a struct page.
+ */
+ vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP;
+
+ if (!scifdev_self(ep->remote_dev))
+ vma->vm_flags |= VM_IO | VM_PFNMAP;
+
+ /* Map this range of windows */
+ err = scif_rma_list_mmap(window, start_offset, nr_pages, vma);
+ if (err) {
+ dev_err(&ep->remote_dev->sdev->dev,
+ "%s %d err %d\n", __func__, __LINE__, err);
+ goto error_unlock;
+ }
+ /* Set up the driver call back */
+ vma->vm_ops = &scif_vm_ops;
+ vma->vm_private_data = vmapvt;
+error_unlock:
+ mutex_unlock(&ep->rma_info.rma_lock);
+ if (err) {
+ kfree(vmapvt);
+ dev_err(&ep->remote_dev->sdev->dev,
+ "%s %d err %d\n", __func__, __LINE__, err);
+ scif_delete_vma(ep, vma);
+ }
+ return err;
+}
projects / platform / kernel / linux-rpi3.git / commitdiff