| /* |
| * Copyright (C) 2013 Red Hat |
| * Author: Rob Clark <robdclark@gmail.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published by |
| * the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/sync_file.h> |
| |
| #include "msm_drv.h" |
| #include "msm_gpu.h" |
| #include "msm_gem.h" |
| |
| /* |
| * Cmdstream submission: |
| */ |
| |
| /* make sure these don't conflict w/ MSM_SUBMIT_BO_x */ |
| #define BO_VALID 0x8000 /* is current addr in cmdstream correct/valid? */ |
| #define BO_LOCKED 0x4000 |
| #define BO_PINNED 0x2000 |
| |
| static struct msm_gem_submit *submit_create(struct drm_device *dev, |
| struct msm_gpu *gpu, struct msm_gpu_submitqueue *queue, |
| uint32_t nr_bos, uint32_t nr_cmds) |
| { |
| struct msm_gem_submit *submit; |
| uint64_t sz = sizeof(*submit) + ((u64)nr_bos * sizeof(submit->bos[0])) + |
| ((u64)nr_cmds * sizeof(submit->cmd[0])); |
| |
| if (sz > SIZE_MAX) |
| return NULL; |
| |
| submit = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); |
| if (!submit) |
| return NULL; |
| |
| submit->dev = dev; |
| submit->gpu = gpu; |
| submit->fence = NULL; |
| submit->pid = get_pid(task_pid(current)); |
| submit->cmd = (void *)&submit->bos[nr_bos]; |
| submit->queue = queue; |
| submit->ring = gpu->rb[queue->prio]; |
| |
| /* initially, until copy_from_user() and bo lookup succeeds: */ |
| submit->nr_bos = 0; |
| submit->nr_cmds = 0; |
| |
| INIT_LIST_HEAD(&submit->node); |
| INIT_LIST_HEAD(&submit->bo_list); |
| ww_acquire_init(&submit->ticket, &reservation_ww_class); |
| |
| return submit; |
| } |
| |
| void msm_gem_submit_free(struct msm_gem_submit *submit) |
| { |
| dma_fence_put(submit->fence); |
| list_del(&submit->node); |
| put_pid(submit->pid); |
| msm_submitqueue_put(submit->queue); |
| |
| kfree(submit); |
| } |
| |
| static inline unsigned long __must_check |
| copy_from_user_inatomic(void *to, const void __user *from, unsigned long n) |
| { |
| if (access_ok(VERIFY_READ, from, n)) |
| return __copy_from_user_inatomic(to, from, n); |
| return -EFAULT; |
| } |
| |
| static int submit_lookup_objects(struct msm_gem_submit *submit, |
| struct drm_msm_gem_submit *args, struct drm_file *file) |
| { |
| unsigned i; |
| int ret = 0; |
| |
| spin_lock(&file->table_lock); |
| pagefault_disable(); |
| |
| for (i = 0; i < args->nr_bos; i++) { |
| struct drm_msm_gem_submit_bo submit_bo; |
| struct drm_gem_object *obj; |
| struct msm_gem_object *msm_obj; |
| void __user *userptr = |
| u64_to_user_ptr(args->bos + (i * sizeof(submit_bo))); |
| |
| /* make sure we don't have garbage flags, in case we hit |
| * error path before flags is initialized: |
| */ |
| submit->bos[i].flags = 0; |
| |
| if (copy_from_user_inatomic(&submit_bo, userptr, sizeof(submit_bo))) { |
| pagefault_enable(); |
| spin_unlock(&file->table_lock); |
| if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) { |
| ret = -EFAULT; |
| goto out; |
| } |
| spin_lock(&file->table_lock); |
| pagefault_disable(); |
| } |
| |
| if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) || |
| !(submit_bo.flags & MSM_SUBMIT_BO_FLAGS)) { |
| DRM_ERROR("invalid flags: %x\n", submit_bo.flags); |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| |
| submit->bos[i].flags = submit_bo.flags; |
| /* in validate_objects() we figure out if this is true: */ |
| submit->bos[i].iova = submit_bo.presumed; |
| |
| /* normally use drm_gem_object_lookup(), but for bulk lookup |
| * all under single table_lock just hit object_idr directly: |
| */ |
| obj = idr_find(&file->object_idr, submit_bo.handle); |
| if (!obj) { |
| DRM_ERROR("invalid handle %u at index %u\n", submit_bo.handle, i); |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| |
| msm_obj = to_msm_bo(obj); |
| |
| if (!list_empty(&msm_obj->submit_entry)) { |
| DRM_ERROR("handle %u at index %u already on submit list\n", |
| submit_bo.handle, i); |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| |
| drm_gem_object_get(obj); |
| |
| submit->bos[i].obj = msm_obj; |
| |
| list_add_tail(&msm_obj->submit_entry, &submit->bo_list); |
| } |
| |
| out_unlock: |
| pagefault_enable(); |
| spin_unlock(&file->table_lock); |
| |
| out: |
| submit->nr_bos = i; |
| |
| return ret; |
| } |
| |
| static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, |
| int i, bool backoff) |
| { |
| struct msm_gem_object *msm_obj = submit->bos[i].obj; |
| |
| if (submit->bos[i].flags & BO_PINNED) |
| msm_gem_put_iova(&msm_obj->base, submit->gpu->aspace); |
| |
| if (submit->bos[i].flags & BO_LOCKED) |
| ww_mutex_unlock(&msm_obj->resv->lock); |
| |
| if (backoff && !(submit->bos[i].flags & BO_VALID)) |
| submit->bos[i].iova = 0; |
| |
| submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED); |
| } |
| |
| /* This is where we make sure all the bo's are reserved and pin'd: */ |
| static int submit_lock_objects(struct msm_gem_submit *submit) |
| { |
| int contended, slow_locked = -1, i, ret = 0; |
| |
| retry: |
| for (i = 0; i < submit->nr_bos; i++) { |
| struct msm_gem_object *msm_obj = submit->bos[i].obj; |
| |
| if (slow_locked == i) |
| slow_locked = -1; |
| |
| contended = i; |
| |
| if (!(submit->bos[i].flags & BO_LOCKED)) { |
| ret = ww_mutex_lock_interruptible(&msm_obj->resv->lock, |
| &submit->ticket); |
| if (ret) |
| goto fail; |
| submit->bos[i].flags |= BO_LOCKED; |
| } |
| } |
| |
| ww_acquire_done(&submit->ticket); |
| |
| return 0; |
| |
| fail: |
| for (; i >= 0; i--) |
| submit_unlock_unpin_bo(submit, i, true); |
| |
| if (slow_locked > 0) |
| submit_unlock_unpin_bo(submit, slow_locked, true); |
| |
| if (ret == -EDEADLK) { |
| struct msm_gem_object *msm_obj = submit->bos[contended].obj; |
| /* we lost out in a seqno race, lock and retry.. */ |
| ret = ww_mutex_lock_slow_interruptible(&msm_obj->resv->lock, |
| &submit->ticket); |
| if (!ret) { |
| submit->bos[contended].flags |= BO_LOCKED; |
| slow_locked = contended; |
| goto retry; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit) |
| { |
| int i, ret = 0; |
| |
| for (i = 0; i < submit->nr_bos; i++) { |
| struct msm_gem_object *msm_obj = submit->bos[i].obj; |
| bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE; |
| |
| if (!write) { |
| /* NOTE: _reserve_shared() must happen before |
| * _add_shared_fence(), which makes this a slightly |
| * strange place to call it. OTOH this is a |
| * convenient can-fail point to hook it in. |
| */ |
| ret = reservation_object_reserve_shared(msm_obj->resv); |
| if (ret) |
| return ret; |
| } |
| |
| if (no_implicit) |
| continue; |
| |
| ret = msm_gem_sync_object(&msm_obj->base, submit->ring->fctx, |
| write); |
| if (ret) |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int submit_pin_objects(struct msm_gem_submit *submit) |
| { |
| int i, ret = 0; |
| |
| submit->valid = true; |
| |
| for (i = 0; i < submit->nr_bos; i++) { |
| struct msm_gem_object *msm_obj = submit->bos[i].obj; |
| uint64_t iova; |
| |
| /* if locking succeeded, pin bo: */ |
| ret = msm_gem_get_iova(&msm_obj->base, |
| submit->gpu->aspace, &iova); |
| |
| if (ret) |
| break; |
| |
| submit->bos[i].flags |= BO_PINNED; |
| |
| if (iova == submit->bos[i].iova) { |
| submit->bos[i].flags |= BO_VALID; |
| } else { |
| submit->bos[i].iova = iova; |
| /* iova changed, so address in cmdstream is not valid: */ |
| submit->bos[i].flags &= ~BO_VALID; |
| submit->valid = false; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int submit_bo(struct msm_gem_submit *submit, uint32_t idx, |
| struct msm_gem_object **obj, uint64_t *iova, bool *valid) |
| { |
| if (idx >= submit->nr_bos) { |
| DRM_ERROR("invalid buffer index: %u (out of %u)\n", |
| idx, submit->nr_bos); |
| return -EINVAL; |
| } |
| |
| if (obj) |
| *obj = submit->bos[idx].obj; |
| if (iova) |
| *iova = submit->bos[idx].iova; |
| if (valid) |
| *valid = !!(submit->bos[idx].flags & BO_VALID); |
| |
| return 0; |
| } |
| |
| /* process the reloc's and patch up the cmdstream as needed: */ |
| static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj, |
| uint32_t offset, uint32_t nr_relocs, uint64_t relocs) |
| { |
| uint32_t i, last_offset = 0; |
| uint32_t *ptr; |
| int ret = 0; |
| |
| if (!nr_relocs) |
| return 0; |
| |
| if (offset % 4) { |
| DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset); |
| return -EINVAL; |
| } |
| |
| /* For now, just map the entire thing. Eventually we probably |
| * to do it page-by-page, w/ kmap() if not vmap()d.. |
| */ |
| ptr = msm_gem_get_vaddr(&obj->base); |
| |
| if (IS_ERR(ptr)) { |
| ret = PTR_ERR(ptr); |
| DBG("failed to map: %d", ret); |
| return ret; |
| } |
| |
| for (i = 0; i < nr_relocs; i++) { |
| struct drm_msm_gem_submit_reloc submit_reloc; |
| void __user *userptr = |
| u64_to_user_ptr(relocs + (i * sizeof(submit_reloc))); |
| uint32_t off; |
| uint64_t iova; |
| bool valid; |
| |
| if (copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc))) { |
| ret = -EFAULT; |
| goto out; |
| } |
| |
| if (submit_reloc.submit_offset % 4) { |
| DRM_ERROR("non-aligned reloc offset: %u\n", |
| submit_reloc.submit_offset); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* offset in dwords: */ |
| off = submit_reloc.submit_offset / 4; |
| |
| if ((off >= (obj->base.size / 4)) || |
| (off < last_offset)) { |
| DRM_ERROR("invalid offset %u at reloc %u\n", off, i); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid); |
| if (ret) |
| goto out; |
| |
| if (valid) |
| continue; |
| |
| iova += submit_reloc.reloc_offset; |
| |
| if (submit_reloc.shift < 0) |
| iova >>= -submit_reloc.shift; |
| else |
| iova <<= submit_reloc.shift; |
| |
| ptr[off] = iova | submit_reloc.or; |
| |
| last_offset = off; |
| } |
| |
| out: |
| msm_gem_put_vaddr(&obj->base); |
| |
| return ret; |
| } |
| |
| static void submit_cleanup(struct msm_gem_submit *submit) |
| { |
| unsigned i; |
| |
| for (i = 0; i < submit->nr_bos; i++) { |
| struct msm_gem_object *msm_obj = submit->bos[i].obj; |
| submit_unlock_unpin_bo(submit, i, false); |
| list_del_init(&msm_obj->submit_entry); |
| drm_gem_object_put(&msm_obj->base); |
| } |
| |
| ww_acquire_fini(&submit->ticket); |
| } |
| |
| int msm_ioctl_gem_submit(struct drm_device *dev, void *data, |
| struct drm_file *file) |
| { |
| struct msm_drm_private *priv = dev->dev_private; |
| struct drm_msm_gem_submit *args = data; |
| struct msm_file_private *ctx = file->driver_priv; |
| struct msm_gem_submit *submit; |
| struct msm_gpu *gpu = priv->gpu; |
| struct sync_file *sync_file = NULL; |
| struct msm_gpu_submitqueue *queue; |
| struct msm_ringbuffer *ring; |
| int out_fence_fd = -1; |
| unsigned i; |
| int ret; |
| |
| if (!gpu) |
| return -ENXIO; |
| |
| /* for now, we just have 3d pipe.. eventually this would need to |
| * be more clever to dispatch to appropriate gpu module: |
| */ |
| if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0) |
| return -EINVAL; |
| |
| if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS) |
| return -EINVAL; |
| |
| if (args->flags & MSM_SUBMIT_SUDO) { |
| if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) || |
| !capable(CAP_SYS_RAWIO)) |
| return -EINVAL; |
| } |
| |
| queue = msm_submitqueue_get(ctx, args->queueid); |
| if (!queue) |
| return -ENOENT; |
| |
| ring = gpu->rb[queue->prio]; |
| |
| if (args->flags & MSM_SUBMIT_FENCE_FD_IN) { |
| struct dma_fence *in_fence; |
| |
| in_fence = sync_file_get_fence(args->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 = 0; |
| if (!dma_fence_match_context(in_fence, ring->fctx->context)) |
| ret = dma_fence_wait(in_fence, true); |
| |
| dma_fence_put(in_fence); |
| if (ret) |
| return ret; |
| } |
| |
| ret = mutex_lock_interruptible(&dev->struct_mutex); |
| if (ret) |
| return ret; |
| |
| if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { |
| out_fence_fd = get_unused_fd_flags(O_CLOEXEC); |
| if (out_fence_fd < 0) { |
| ret = out_fence_fd; |
| goto out_unlock; |
| } |
| } |
| |
| submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds); |
| if (!submit) { |
| ret = -ENOMEM; |
| goto out_unlock; |
| } |
| |
| if (args->flags & MSM_SUBMIT_SUDO) |
| submit->in_rb = true; |
| |
| ret = submit_lookup_objects(submit, args, file); |
| if (ret) |
| goto out; |
| |
| ret = submit_lock_objects(submit); |
| if (ret) |
| goto out; |
| |
| ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT)); |
| if (ret) |
| goto out; |
| |
| ret = submit_pin_objects(submit); |
| if (ret) |
| goto out; |
| |
| for (i = 0; i < args->nr_cmds; i++) { |
| struct drm_msm_gem_submit_cmd submit_cmd; |
| void __user *userptr = |
| u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd))); |
| struct msm_gem_object *msm_obj; |
| uint64_t iova; |
| |
| ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd)); |
| if (ret) { |
| ret = -EFAULT; |
| goto out; |
| } |
| |
| /* validate input from userspace: */ |
| switch (submit_cmd.type) { |
| case MSM_SUBMIT_CMD_BUF: |
| case MSM_SUBMIT_CMD_IB_TARGET_BUF: |
| case MSM_SUBMIT_CMD_CTX_RESTORE_BUF: |
| break; |
| default: |
| DRM_ERROR("invalid type: %08x\n", submit_cmd.type); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| ret = submit_bo(submit, submit_cmd.submit_idx, |
| &msm_obj, &iova, NULL); |
| if (ret) |
| goto out; |
| |
| if (submit_cmd.size % 4) { |
| DRM_ERROR("non-aligned cmdstream buffer size: %u\n", |
| submit_cmd.size); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (!submit_cmd.size || |
| ((submit_cmd.size + submit_cmd.submit_offset) > |
| msm_obj->base.size)) { |
| DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| submit->cmd[i].type = submit_cmd.type; |
| submit->cmd[i].size = submit_cmd.size / 4; |
| submit->cmd[i].iova = iova + submit_cmd.submit_offset; |
| submit->cmd[i].idx = submit_cmd.submit_idx; |
| |
| if (submit->valid) |
| continue; |
| |
| ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset, |
| submit_cmd.nr_relocs, submit_cmd.relocs); |
| if (ret) |
| goto out; |
| } |
| |
| submit->nr_cmds = i; |
| |
| submit->fence = msm_fence_alloc(ring->fctx); |
| if (IS_ERR(submit->fence)) { |
| ret = PTR_ERR(submit->fence); |
| submit->fence = NULL; |
| goto out; |
| } |
| |
| if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { |
| sync_file = sync_file_create(submit->fence); |
| if (!sync_file) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| } |
| |
| msm_gpu_submit(gpu, submit, ctx); |
| |
| args->fence = submit->fence->seqno; |
| |
| if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { |
| fd_install(out_fence_fd, sync_file->file); |
| args->fence_fd = out_fence_fd; |
| } |
| |
| out: |
| submit_cleanup(submit); |
| if (ret) |
| msm_gem_submit_free(submit); |
| out_unlock: |
| if (ret && (out_fence_fd >= 0)) |
| put_unused_fd(out_fence_fd); |
| mutex_unlock(&dev->struct_mutex); |
| return ret; |
| } |