// SPDX-License-Identifier: MIT
/*
* Copyright (C) 2015 Red Hat, Inc.
* All Rights Reserved.
*
* Authors:
* Dave Airlie
* Alon Levy
*/
#include <linux/dma-fence-unwrap.h>
#include <linux/file.h>
#include <linux/sync_file.h>
#include <linux/uaccess.h>
#include <drm/drm_file.h>
#include <drm/drm_syncobj.h>
#include <drm/virtgpu_drm.h>
#include "virtgpu_drv.h"
struct virtio_gpu_submit_post_dep {
struct drm_syncobj *syncobj;
struct dma_fence_chain *chain;
u64 point;
};
struct virtio_gpu_submit {
struct virtio_gpu_submit_post_dep *post_deps;
unsigned int num_out_syncobjs;
struct drm_syncobj **in_syncobjs;
unsigned int num_in_syncobjs;
struct virtio_gpu_object_array *buflist;
struct drm_virtgpu_execbuffer *exbuf;
struct virtio_gpu_fence *out_fence;
struct virtio_gpu_fpriv *vfpriv;
struct virtio_gpu_device *vgdev;
struct sync_file *sync_file;
struct drm_file *file;
int out_fence_fd;
u64 fence_ctx;
u32 ring_idx;
void *buf;
};
static int virtio_gpu_do_fence_wait(struct virtio_gpu_submit *submit,
struct dma_fence *in_fence)
{
u64 context = submit->fence_ctx + submit->ring_idx;
if (dma_fence_match_context(in_fence, context))
return 0;
return dma_fence_wait(in_fence, true);
}
static int virtio_gpu_dma_fence_wait(struct virtio_gpu_submit *submit,
struct dma_fence *fence)
{
struct dma_fence_unwrap itr;
struct dma_fence *f;
int err;
dma_fence_unwrap_for_each(f, &itr, fence) {
err = virtio_gpu_do_fence_wait(submit, f);
if (err)
return err;
}
return 0;
}
static void virtio_gpu_free_syncobjs(struct drm_syncobj **syncobjs,
u32 nr_syncobjs)
{
u32 i = nr_syncobjs;
while (i--) {
if (syncobjs[i])
drm_syncobj_put(syncobjs[i]);
}
kvfree(syncobjs);
}
static int
virtio_gpu_parse_deps(struct virtio_gpu_submit *submit)
{
struct drm_virtgpu_execbuffer *exbuf = submit->exbuf;
struct drm_virtgpu_execbuffer_syncobj syncobj_desc;
size_t syncobj_stride = exbuf->syncobj_stride;
u32 num_in_syncobjs = exbuf->num_in_syncobjs;
struct drm_syncobj **syncobjs;
int ret = 0, i;
if (!num_in_syncobjs)
return 0;
/*
* kvmalloc() at first tries to allocate memory using kmalloc() and
* falls back to vmalloc() only on failure. It also uses __GFP_NOWARN
* internally for allocations larger than a page size, preventing
* storm of KMSG warnings.
*/
syncobjs = kvcalloc(num_in_syncobjs, sizeof(*syncobjs), GFP_KERNEL);
if (!syncobjs)
return -ENOMEM;
for (i = 0; i < num_in_syncobjs; i++) {
u64 address = exbuf->in_syncobjs + i * syncobj_stride;
struct dma_fence *fence;
memset(&syncobj_desc, 0, sizeof(syncobj_desc));
if (copy_from_user(&syncobj_desc,
u64_to_user_ptr(address),
min(syncobj_stride, sizeof(syncobj_desc)))) {
ret = -EFAULT;
break;
}
if (syncobj_desc.flags & ~VIRTGPU_EXECBUF_SYNCOBJ_FLAGS) {
ret = -EINVAL;
break;
}
ret = drm_syncobj_find_fence(submit->file, syncobj_desc.handle,
syncobj_desc.point, 0, &fence);
if (ret)
break;
ret = virtio_gpu_dma_fence_wait(submit, fence);
dma_fence_put(fence);
if (ret)
break;
if (syncobj_desc.flags & VIRTGPU_EXECBUF_SYNCOBJ_RESET) {
syncobjs[i] = drm_syncobj_find(submit->file,
syncobj_desc.handle);
if (!syncobjs[i]) {
ret = -EINVAL;
break;
}
}
}
if (ret) {
virtio_gpu_free_syncobjs(syncobjs, i);
return ret;
}
submit->num_in_syncobjs = num_in_syncobjs;
submit->in_syncobjs = syncobjs;
return ret;
}
static void virtio_gpu_reset_syncobjs(struct drm_syncobj **syncobjs,
u32 nr_syncobjs)
{
u32 i;
for (i = 0; i < nr_syncobjs; i++) {
if (syncobjs[i])
drm_syncobj_replace_fence(syncobjs[i], NULL);
}
}
static void
virtio_gpu_free_post_deps(struct virtio_gpu_submit_post_dep *post_deps,
u32 nr_syncobjs)
{
u32 i = nr_syncobjs;
while (i--) {
kfree(post_deps[i].chain);
drm_syncobj_put(post_deps[i].syncobj);
}
kvfree(post_deps);
}
static int virtio_gpu_parse_post_deps(struct virtio_gpu_submit *submit)
{
struct drm_virtgpu_execbuffer *exbuf = submit->exbuf;
struct drm_virtgpu_execbuffer_syncobj syncobj_desc;
struct virtio_gpu_submit_post_dep *post_deps;
u32 num_out_syncobjs = exbuf->num_out_syncobjs;
size_t syncobj_stride = exbuf->syncobj_stride;
int ret = 0, i;
if (!num_out_syncobjs)
return 0;
post_deps = kvcalloc(num_out_syncobjs, sizeof(*post_deps), GFP_KERNEL);
if (!post_deps)
return -ENOMEM;
for (i = 0; i < num_out_syncobjs; i++) {
u64 address = exbuf->out_syncobjs + i * syncobj_stride;
memset(&syncobj_desc, 0, sizeof(syncobj_desc));
if (copy_from_user(&syncobj_desc,
u64_to_user_ptr(address),
min(syncobj_stride, sizeof(syncobj_desc)))) {
ret = -EFAULT;
break;
}
post_deps[i].point = syncobj_desc.point;
if (syncobj_desc.flags) {
ret = -EINVAL;
break;
}
if (syncobj_desc.point) {
post_deps[i].chain = dma_fence_chain_alloc();
if (!post_deps[i].chain) {
ret = -ENOMEM;
break;
}
}
post_deps[i].syncobj = drm_syncobj_find(submit->file,
syncobj_desc.handle);
if (!post_deps[i].syncobj) {
kfree(post_deps[i].chain);
ret = -EINVAL;
break;
}
}
if (ret) {
virtio_gpu_free_post_deps(post_deps, i);
return ret;
}
submit->num_out_syncobjs = num_out_syncobjs;
submit->post_deps = post_deps;
return 0;
}
static void
virtio_gpu_process_post_deps(struct virtio_gpu_submit *submit)
{
struct virtio_gpu_submit_post_dep *post_deps = submit->post_deps;
if (post_deps) {
struct dma_fence *fence = &submit->out_fence->f;
u32 i;
for (i = 0; i < submit->num_out_syncobjs; i++) {
if (post_deps[i].chain) {
drm_syncobj_add_point(post_deps[i].syncobj,
post_deps[i].chain,
fence, post_deps[i].point);
post_deps[i].chain = NULL;
} else {
drm_syncobj_replace_fence(post_deps[i].syncobj,
fence);
}
}
}
}
static int virtio_gpu_fence_event_create(struct drm_device *dev,
struct drm_file *file,
struct virtio_gpu_fence *fence,
u32 ring_idx)
{
struct virtio_gpu_fence_event *e = NULL;
int ret;
e = kzalloc(sizeof(*e), GFP_KERNEL);
if (!e)
return -ENOMEM;
e->event.type = VIRTGPU_EVENT_FENCE_SIGNALED;
e->event.length = sizeof(e->event);
ret = drm_event_reserve_init(dev, file, &e->base, &e->event);
if (ret) {
kfree(e);
return ret;
}
fence->e = e;
return 0;
}
static int virtio_gpu_init_submit_buflist(struct virtio_gpu_submit *submit)
{
struct drm_virtgpu_execbuffer *exbuf = submit->exbuf;
u32 *bo_handles;
if (!exbuf->num_bo_handles)
return 0;
bo_handles = kvmalloc_array(exbuf->num_bo_handles, sizeof(*bo_handles),
GFP_KERNEL);
if (!bo_handles)
return -ENOMEM;
if (copy_from_user(bo_handles, u64_to_user_ptr(exbuf->bo_handles),
exbuf->num_bo_handles * sizeof(*bo_handles))) {
kvfree(bo_handles);
return -EFAULT;
}
submit->buflist = virtio_gpu_array_from_handles(submit->file, bo_handles,
exbuf->num_bo_handles);
if (!submit->buflist) {
kvfree(bo_handles);
return -ENOENT;
}
kvfree(bo_handles);
return 0;
}
static void virtio_gpu_cleanup_submit(struct virtio_gpu_submit *submit)
{
virtio_gpu_reset_syncobjs(submit->in_syncobjs, submit->num_in_syncobjs);
virtio_gpu_free_syncobjs(submit->in_syncobjs, submit->num_in_syncobjs);
virtio_gpu_free_post_deps(submit->post_deps, submit->num_out_syncobjs);
if (!IS_ERR(submit->buf))
kvfree(submit->buf);
if (submit->buflist)
virtio_gpu_array_put_free(submit->buflist);
if (submit->out_fence_fd >= 0)
put_unused_fd(submit->out_fence_fd);
if (submit->out_fence)
dma_fence_put(&submit->out_fence->f);
if (submit->sync_file)
fput(submit->sync_file->file);
}
static void virtio_gpu_submit(struct virtio_gpu_submit *submit)
{
virtio_gpu_cmd_submit(submit->vgdev, submit->buf, submit->exbuf->size,
submit->vfpriv->ctx_id, submit->buflist,
submit->out_fence);
virtio_gpu_notify(submit->vgdev);
}
static void virtio_gpu_complete_submit(struct virtio_gpu_submit *submit)
{
submit->buf = NULL;
submit->buflist = NULL;
submit->sync_file = NULL;
submit->out_fence_fd = -1;
}
static int virtio_gpu_init_submit(struct virtio_gpu_submit *submit,
struct drm_virtgpu_execbuffer *exbuf,
struct drm_device *dev,
struct drm_file *file,
u64 fence_ctx, u32 ring_idx)
{
struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
struct virtio_gpu_device *vgdev = dev->dev_private;
struct virtio_gpu_fence *out_fence;
bool drm_fence_event;
int err;
memset(submit, 0, sizeof(*submit));
if ((exbuf->flags & VIRTGPU_EXECBUF_RING_IDX) &&
(vfpriv->ring_idx_mask & BIT_ULL(ring_idx)))
drm_fence_event = true;
else
drm_fence_event = false;
if ((exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_OUT) ||
exbuf->num_out_syncobjs ||
exbuf->num_bo_handles ||
drm_fence_event)
out_fence = virtio_gpu_fence_alloc(vgdev, fence_ctx, ring_idx);
else
out_fence = NULL;
if (drm_fence_event) {
err = virtio_gpu_fence_event_create(dev, file, out_fence, ring_idx);
if (err) {
dma_fence_put(&out_fence->f);
return err;
}
}
submit->out_fence = out_fence;
submit->fence_ctx = fence_ctx;
submit->ring_idx = ring_idx;
submit->out_fence_fd = -1;
submit->vfpriv = vfpriv;
submit->vgdev = vgdev;
submit->exbuf = exbuf;
submit->file = file;
err = virtio_gpu_init_submit_buflist(submit);
if (err)
return err;
submit->buf = vmemdup_user(u64_to_user_ptr(exbuf->command), exbuf->size);
if (IS_ERR(submit->buf))
return PTR_ERR(submit->buf);
if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_OUT) {
err = get_unused_fd_flags(O_CLOEXEC);
if (err < 0)
return err;
submit->out_fence_fd = err;
submit->sync_file = sync_file_create(&out_fence->f);
if (!submit->sync_file)
return -ENOMEM;
}
return 0;
}
static int virtio_gpu_wait_in_fence(struct virtio_gpu_submit *submit)
{
int ret = 0;
if (submit->exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_IN) {
struct dma_fence *in_fence =
sync_file_get_fence(submit->exbuf->fence_fd);
if (!in_fence)
return -EINVAL;
/*
* Wait if the fence is from a foreign context, or if the
* fence array contains any fence from a foreign context.
*/
ret = virtio_gpu_dma_fence_wait(submit, in_fence);
dma_fence_put(in_fence);
}
return ret;
}
static void virtio_gpu_install_out_fence_fd(struct virtio_gpu_submit *submit)
{
if (submit->sync_file) {
submit->exbuf->fence_fd = submit->out_fence_fd;
fd_install(submit->out_fence_fd, submit->sync_file->file);
}
}
static int virtio_gpu_lock_buflist(struct virtio_gpu_submit *submit)
{
if (submit->buflist)
return virtio_gpu_array_lock_resv(submit->buflist);
return 0;
}
int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
{
struct virtio_gpu_device *vgdev = dev->dev_private;
struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
u64 fence_ctx = vgdev->fence_drv.context;
struct drm_virtgpu_execbuffer *exbuf = data;
struct virtio_gpu_submit submit;
u32 ring_idx = 0;
int ret = -EINVAL;
if (!vgdev->has_virgl_3d)
return -ENOSYS;
if (exbuf->flags & ~VIRTGPU_EXECBUF_FLAGS)
return ret;
if (exbuf->flags & VIRTGPU_EXECBUF_RING_IDX) {
if (exbuf->ring_idx >= vfpriv->num_rings)
return ret;
if (!vfpriv->base_fence_ctx)
return ret;
fence_ctx = vfpriv->base_fence_ctx;
ring_idx = exbuf->ring_idx;
}
virtio_gpu_create_context(dev, file);
ret = virtio_gpu_init_submit(&submit, exbuf, dev, file,
fence_ctx, ring_idx);
if (ret)
goto cleanup;
ret = virtio_gpu_parse_post_deps(&submit);
if (ret)
goto cleanup;
ret = virtio_gpu_parse_deps(&submit);
if (ret)
goto cleanup;
/*
* Await in-fences in the end of the job submission path to
* optimize the path by proceeding directly to the submission
* to virtio after the waits.
*/
ret = virtio_gpu_wait_in_fence(&submit);
if (ret)
goto cleanup;
ret = virtio_gpu_lock_buflist(&submit);
if (ret)
goto cleanup;
virtio_gpu_submit(&submit);
/*
* Set up user-out data after submitting the job to optimize
* the job submission path.
*/
virtio_gpu_install_out_fence_fd(&submit);
virtio_gpu_process_post_deps(&submit);
virtio_gpu_complete_submit(&submit);
cleanup:
virtio_gpu_cleanup_submit(&submit);
return ret;
}
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