From: Maarten Lankhorst maarten.lankhorst@linux.intel.com
vmap is using pin_pages, but needs to use ww locking, add pin_pages_unlocked to correctly lock the mapping.
Also add ww locking to begin/end cpu access.
Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Thomas Hellström thomas.hellstrom@linux.intel.com --- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 60 ++++++++++++---------- 1 file changed, 33 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index 36e3c2765f4c..c4b01e819786 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -82,7 +82,7 @@ static int i915_gem_dmabuf_vmap(struct dma_buf *dma_buf, struct dma_buf_map *map struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); void *vaddr;
- vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB); + vaddr = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB); if (IS_ERR(vaddr)) return PTR_ERR(vaddr);
@@ -123,42 +123,48 @@ static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_dire { struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); + struct i915_gem_ww_ctx ww; int err;
- err = i915_gem_object_pin_pages(obj); - if (err) - return err; - - err = i915_gem_object_lock_interruptible(obj, NULL); - if (err) - goto out; - - err = i915_gem_object_set_to_cpu_domain(obj, write); - i915_gem_object_unlock(obj); - -out: - i915_gem_object_unpin_pages(obj); + i915_gem_ww_ctx_init(&ww, true); +retry: + err = i915_gem_object_lock(obj, &ww); + if (!err) + err = i915_gem_object_pin_pages(obj); + if (!err) { + err = i915_gem_object_set_to_cpu_domain(obj, write); + i915_gem_object_unpin_pages(obj); + } + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); return err; }
static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) { struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); + struct i915_gem_ww_ctx ww; int err;
- err = i915_gem_object_pin_pages(obj); - if (err) - return err; - - err = i915_gem_object_lock_interruptible(obj, NULL); - if (err) - goto out; - - err = i915_gem_object_set_to_gtt_domain(obj, false); - i915_gem_object_unlock(obj); - -out: - i915_gem_object_unpin_pages(obj); + i915_gem_ww_ctx_init(&ww, true); +retry: + err = i915_gem_object_lock(obj, &ww); + if (!err) + err = i915_gem_object_pin_pages(obj); + if (!err) { + err = i915_gem_object_set_to_gtt_domain(obj, false); + i915_gem_object_unpin_pages(obj); + } + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); return err; }