[PATCH] accel/ivpu: Use dma_resv_lock() instead of a custom mutex
Jacek Lawrynowicz
jacek.lawrynowicz at linux.intel.com
Wed May 28 15:43:25 UTC 2025
This fixes a potential race conditions in:
- ivpu_bo_unbind_locked() where we modified the shmem->sgt without
holding the dma_resv_lock().
- ivpu_bo_print_info() where we read the shmem->pages without
holding the dma_resv_lock().
Using dma_resv_lock() also protects against future syncronisation
issues that may arise when accessing drm_gem_shmem_object or
drm_gem_object members.
Fixes: 42328003ecb6 ("accel/ivpu: Refactor BO creation functions")
Cc: <stable at vger.kernel.org> # v6.9+
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz at linux.intel.com>
---
drivers/accel/ivpu/ivpu_gem.c | 63 +++++++++++++++++++----------------
drivers/accel/ivpu/ivpu_gem.h | 1 -
2 files changed, 34 insertions(+), 30 deletions(-)
diff --git a/drivers/accel/ivpu/ivpu_gem.c b/drivers/accel/ivpu/ivpu_gem.c
index c193a80241f5f..5908268ca45e9 100644
--- a/drivers/accel/ivpu/ivpu_gem.c
+++ b/drivers/accel/ivpu/ivpu_gem.c
@@ -33,6 +33,16 @@ static inline void ivpu_dbg_bo(struct ivpu_device *vdev, struct ivpu_bo *bo, con
(bool)bo->base.base.import_attach);
}
+static inline int ivpu_bo_lock(struct ivpu_bo *bo)
+{
+ return dma_resv_lock(bo->base.base.resv, NULL);
+}
+
+static inline void ivpu_bo_unlock(struct ivpu_bo *bo)
+{
+ dma_resv_unlock(bo->base.base.resv);
+}
+
/*
* ivpu_bo_pin() - pin the backing physical pages and map them to VPU.
*
@@ -43,22 +53,22 @@ static inline void ivpu_dbg_bo(struct ivpu_device *vdev, struct ivpu_bo *bo, con
int __must_check ivpu_bo_pin(struct ivpu_bo *bo)
{
struct ivpu_device *vdev = ivpu_bo_to_vdev(bo);
+ struct sg_table *sgt;
int ret = 0;
- mutex_lock(&bo->lock);
-
ivpu_dbg_bo(vdev, bo, "pin");
- drm_WARN_ON(&vdev->drm, !bo->ctx);
- if (!bo->mmu_mapped) {
- struct sg_table *sgt = drm_gem_shmem_get_pages_sgt(&bo->base);
+ sgt = drm_gem_shmem_get_pages_sgt(&bo->base);
+ if (IS_ERR(sgt)) {
+ ret = PTR_ERR(sgt);
+ ivpu_err(vdev, "Failed to map BO in IOMMU: %d\n", ret);
+ return ret;
+ }
- if (IS_ERR(sgt)) {
- ret = PTR_ERR(sgt);
- ivpu_err(vdev, "Failed to map BO in IOMMU: %d\n", ret);
- goto unlock;
- }
+ ivpu_bo_lock(bo);
+ if (!bo->mmu_mapped) {
+ drm_WARN_ON(&vdev->drm, !bo->ctx);
ret = ivpu_mmu_context_map_sgt(vdev, bo->ctx, bo->vpu_addr, sgt,
ivpu_bo_is_snooped(bo));
if (ret) {
@@ -69,7 +79,7 @@ int __must_check ivpu_bo_pin(struct ivpu_bo *bo)
}
unlock:
- mutex_unlock(&bo->lock);
+ ivpu_bo_unlock(bo);
return ret;
}
@@ -84,7 +94,7 @@ ivpu_bo_alloc_vpu_addr(struct ivpu_bo *bo, struct ivpu_mmu_context *ctx,
if (!drm_dev_enter(&vdev->drm, &idx))
return -ENODEV;
- mutex_lock(&bo->lock);
+ ivpu_bo_lock(bo);
ret = ivpu_mmu_context_insert_node(ctx, range, ivpu_bo_size(bo), &bo->mm_node);
if (!ret) {
@@ -94,7 +104,7 @@ ivpu_bo_alloc_vpu_addr(struct ivpu_bo *bo, struct ivpu_mmu_context *ctx,
ivpu_err(vdev, "Failed to add BO to context %u: %d\n", ctx->id, ret);
}
- mutex_unlock(&bo->lock);
+ ivpu_bo_unlock(bo);
drm_dev_exit(idx);
@@ -105,7 +115,7 @@ static void ivpu_bo_unbind_locked(struct ivpu_bo *bo)
{
struct ivpu_device *vdev = ivpu_bo_to_vdev(bo);
- lockdep_assert(lockdep_is_held(&bo->lock) || !kref_read(&bo->base.base.refcount));
+ lockdep_assert(dma_resv_held(bo->base.base.resv) || !kref_read(&bo->base.base.refcount));
if (bo->mmu_mapped) {
drm_WARN_ON(&vdev->drm, !bo->ctx);
@@ -123,14 +133,12 @@ static void ivpu_bo_unbind_locked(struct ivpu_bo *bo)
if (bo->base.base.import_attach)
return;
- dma_resv_lock(bo->base.base.resv, NULL);
if (bo->base.sgt) {
dma_unmap_sgtable(vdev->drm.dev, bo->base.sgt, DMA_BIDIRECTIONAL, 0);
sg_free_table(bo->base.sgt);
kfree(bo->base.sgt);
bo->base.sgt = NULL;
}
- dma_resv_unlock(bo->base.base.resv);
}
void ivpu_bo_unbind_all_bos_from_context(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx)
@@ -142,12 +150,12 @@ void ivpu_bo_unbind_all_bos_from_context(struct ivpu_device *vdev, struct ivpu_m
mutex_lock(&vdev->bo_list_lock);
list_for_each_entry(bo, &vdev->bo_list, bo_list_node) {
- mutex_lock(&bo->lock);
+ ivpu_bo_lock(bo);
if (bo->ctx == ctx) {
ivpu_dbg_bo(vdev, bo, "unbind");
ivpu_bo_unbind_locked(bo);
}
- mutex_unlock(&bo->lock);
+ ivpu_bo_unlock(bo);
}
mutex_unlock(&vdev->bo_list_lock);
}
@@ -167,7 +175,6 @@ struct drm_gem_object *ivpu_gem_create_object(struct drm_device *dev, size_t siz
bo->base.pages_mark_dirty_on_put = true; /* VPU can dirty a BO anytime */
INIT_LIST_HEAD(&bo->bo_list_node);
- mutex_init(&bo->lock);
return &bo->base.base;
}
@@ -286,8 +293,6 @@ static void ivpu_gem_bo_free(struct drm_gem_object *obj)
drm_WARN_ON(&vdev->drm, bo->mmu_mapped);
drm_WARN_ON(&vdev->drm, bo->ctx);
- mutex_destroy(&bo->lock);
-
drm_WARN_ON(obj->dev, bo->base.pages_use_count > 1);
drm_gem_shmem_free(&bo->base);
}
@@ -370,9 +375,9 @@ ivpu_bo_create(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx,
goto err_put;
if (flags & DRM_IVPU_BO_MAPPABLE) {
- dma_resv_lock(bo->base.base.resv, NULL);
+ ivpu_bo_lock(bo);
ret = drm_gem_shmem_vmap(&bo->base, &map);
- dma_resv_unlock(bo->base.base.resv);
+ ivpu_bo_unlock(bo);
if (ret)
goto err_put;
@@ -395,9 +400,9 @@ void ivpu_bo_free(struct ivpu_bo *bo)
struct iosys_map map = IOSYS_MAP_INIT_VADDR(bo->base.vaddr);
if (bo->flags & DRM_IVPU_BO_MAPPABLE) {
- dma_resv_lock(bo->base.base.resv, NULL);
+ ivpu_bo_lock(bo);
drm_gem_shmem_vunmap(&bo->base, &map);
- dma_resv_unlock(bo->base.base.resv);
+ ivpu_bo_unlock(bo);
}
drm_gem_object_put(&bo->base.base);
@@ -416,12 +421,12 @@ int ivpu_bo_info_ioctl(struct drm_device *dev, void *data, struct drm_file *file
bo = to_ivpu_bo(obj);
- mutex_lock(&bo->lock);
+ ivpu_bo_lock(bo);
args->flags = bo->flags;
args->mmap_offset = drm_vma_node_offset_addr(&obj->vma_node);
args->vpu_addr = bo->vpu_addr;
args->size = obj->size;
- mutex_unlock(&bo->lock);
+ ivpu_bo_unlock(bo);
drm_gem_object_put(obj);
return ret;
@@ -458,7 +463,7 @@ int ivpu_bo_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file
static void ivpu_bo_print_info(struct ivpu_bo *bo, struct drm_printer *p)
{
- mutex_lock(&bo->lock);
+ ivpu_bo_lock(bo);
drm_printf(p, "%-9p %-3u 0x%-12llx %-10lu 0x%-8x %-4u",
bo, bo->ctx_id, bo->vpu_addr, bo->base.base.size,
@@ -475,7 +480,7 @@ static void ivpu_bo_print_info(struct ivpu_bo *bo, struct drm_printer *p)
drm_printf(p, "\n");
- mutex_unlock(&bo->lock);
+ ivpu_bo_unlock(bo);
}
void ivpu_bo_list(struct drm_device *dev, struct drm_printer *p)
diff --git a/drivers/accel/ivpu/ivpu_gem.h b/drivers/accel/ivpu/ivpu_gem.h
index 0c93118c85bd3..aa8ff14f7aae1 100644
--- a/drivers/accel/ivpu/ivpu_gem.h
+++ b/drivers/accel/ivpu/ivpu_gem.h
@@ -17,7 +17,6 @@ struct ivpu_bo {
struct list_head bo_list_node;
struct drm_mm_node mm_node;
- struct mutex lock; /* Protects: ctx, mmu_mapped, vpu_addr */
u64 vpu_addr;
u32 flags;
u32 job_status; /* Valid only for command buffer */
--
2.45.1
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