drm/i915: Drop dma_buf->k(un)map

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Aside, I think mock_dmabuf would be a nice addition to drm
mock/selftest helpers (we have some already), with an
EXPORT_SYMBOL_FOR_TESTS_ONLY.
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: "Christian König" <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118103536.17675-7-daniel.vetter@ffwll.ch

drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c

@@ -93,40 +93,6 @@ static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
 	i915_gem_object_unpin_map(obj);
 }
 
-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)
 {
 	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
@@ -195,8 +161,6 @@ static const struct dma_buf_ops i915_dmabuf_ops =  {
 	.map_dma_buf = i915_gem_map_dma_buf,
 	.unmap_dma_buf = i915_gem_unmap_dma_buf,
 	.release = drm_gem_dmabuf_release,
-	.map = i915_gem_dmabuf_kmap,
-	.unmap = i915_gem_dmabuf_kunmap,
 	.mmap = i915_gem_dmabuf_mmap,
 	.vmap = i915_gem_dmabuf_vmap,
 	.vunmap = i915_gem_dmabuf_vunmap,

drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c

@@ -76,20 +76,6 @@ static void mock_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
 	vm_unmap_ram(vaddr, mock->npages);
 }
 
-static void *mock_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
-{
-	struct mock_dmabuf *mock = to_mock(dma_buf);
-
-	return kmap(mock->pages[page_num]);
-}
-
-static void mock_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
-{
-	struct mock_dmabuf *mock = to_mock(dma_buf);
-
-	return kunmap(mock->pages[page_num]);
-}
-
 static int mock_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
 {
 	return -ENODEV;
@@ -99,8 +85,6 @@ static const struct dma_buf_ops mock_dmabuf_ops =  {
 	.map_dma_buf = mock_map_dma_buf,
 	.unmap_dma_buf = mock_unmap_dma_buf,
 	.release = mock_dmabuf_release,
-	.map = mock_dmabuf_kmap,
-	.unmap = mock_dmabuf_kunmap,
 	.mmap = mock_dmabuf_mmap,
 	.vmap = mock_dmabuf_vmap,
 	.vunmap = mock_dmabuf_vunmap,