drm/gem: Provide drm_gem_fb_{vmap,vunmap}()

[linux-2.6-microblaze.git] / drivers / gpu / drm / drm_gem_framebuffer_helper.c

diff --git a/drivers/gpu/drm/drm_gem_framebuffer_helper.c b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
index 421e029..2bc0605 100644 (file)
--- a/drivers/gpu/drm/drm_gem_framebuffer_helper.c
+++ b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
@@ -15,6 +15,8 @@
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_modeset_helper.h>
 
+#include "drm_internal.h"
+
 #define AFBC_HEADER_SIZE               16
 #define AFBC_TH_LAYOUT_ALIGNMENT       8
 #define AFBC_HDR_ALIGN                 64
@@ -309,6 +311,76 @@ drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
 }
 EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
 
+/**
+ * drm_gem_fb_vmap - maps all framebuffer BOs into kernel address space
+ * @fb: the framebuffer
+ * @map: returns the mapping's address for each BO
+ *
+ * This function maps all buffer objects of the given framebuffer into
+ * kernel address space and stores them in struct dma_buf_map. If the
+ * mapping operation fails for one of the BOs, the function unmaps the
+ * already established mappings automatically.
+ *
+ * See drm_gem_fb_vunmap() for unmapping.
+ *
+ * Returns:
+ * 0 on success, or a negative errno code otherwise.
+ */
+int drm_gem_fb_vmap(struct drm_framebuffer *fb,
+                   struct dma_buf_map map[static DRM_FORMAT_MAX_PLANES])
+{
+       struct drm_gem_object *obj;
+       unsigned int i;
+       int ret;
+
+       for (i = 0; i < DRM_FORMAT_MAX_PLANES; ++i) {
+               obj = drm_gem_fb_get_obj(fb, i);
+               if (!obj)
+                       continue;
+               ret = drm_gem_vmap(obj, &map[i]);
+               if (ret)
+                       goto err_drm_gem_vunmap;
+       }
+
+       return 0;
+
+err_drm_gem_vunmap:
+       while (i) {
+               --i;
+               obj = drm_gem_fb_get_obj(fb, i);
+               if (!obj)
+                       continue;
+               drm_gem_vunmap(obj, &map[i]);
+       }
+       return ret;
+}
+EXPORT_SYMBOL(drm_gem_fb_vmap);
+
+/**
+ * drm_gem_fb_vunmap - unmaps framebuffer BOs from kernel address space
+ * @fb: the framebuffer
+ * @map: mapping addresses as returned by drm_gem_fb_vmap()
+ *
+ * This function unmaps all buffer objects of the given framebuffer.
+ *
+ * See drm_gem_fb_vmap() for more information.
+ */
+void drm_gem_fb_vunmap(struct drm_framebuffer *fb,
+                      struct dma_buf_map map[static DRM_FORMAT_MAX_PLANES])
+{
+       unsigned int i = DRM_FORMAT_MAX_PLANES;
+       struct drm_gem_object *obj;
+
+       while (i) {
+               --i;
+               obj = drm_gem_fb_get_obj(fb, i);
+               if (!obj)
+                       continue;
+               drm_gem_vunmap(obj, &map[i]);
+       }
+}
+EXPORT_SYMBOL(drm_gem_fb_vunmap);
+
 /**
  * drm_gem_fb_begin_cpu_access - prepares GEM buffer objects for CPU access
  * @fb: the framebuffer