diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_dmabuf.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_dmabuf.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index f225bf680b6d..6176e589cf09 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -122,12 +122,36 @@ static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long } static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) { + struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); + struct page *page; + + if (page_num >= obj->base.size >> PAGE_SHIFT) + return NULL; + + if (!i915_gem_object_has_struct_page(obj)) + return NULL; + + if (i915_gem_object_pin_pages(obj)) + return NULL; + + /* Synchronisation is left to the caller (via .begin_cpu_access()) */ + page = i915_gem_object_get_page(obj, page_num); + if (IS_ERR(page)) + goto err_unpin; + + return kmap(page); + +err_unpin: + i915_gem_object_unpin_pages(obj); return NULL; } static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) { + struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); + kunmap(virt_to_page(addr)); + i915_gem_object_unpin_pages(obj); } static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |