From 89177644a7b6306e6084a89eab7e290f4bfef397 Mon Sep 17 00:00:00 2001 From: Aaron Plattner Date: Tue, 15 Jan 2013 20:47:42 +0000 Subject: drm: add prime helpers Instead of reimplementing all of the dma_buf functionality in every driver, create helpers drm_prime_import and drm_prime_export that implement them in terms of new, lower-level hook functions: gem_prime_pin: callback when a buffer is created, used to pin buffers into GTT gem_prime_get_sg_table: convert a drm_gem_object to an sg_table for export gem_prime_import_sg_table: convert an sg_table into a drm_gem_object gem_prime_vmap, gem_prime_vunmap: map and unmap an object These hooks are optional; drivers can opt in by using drm_gem_prime_import and drm_gem_prime_export as the .gem_prime_import and .gem_prime_export fields of struct drm_driver. v2: - Drop .begin_cpu_access. None of the drivers this code replaces implemented it. Having it here was a leftover from when I was trying to include i915 in this rework. - Use mutex_lock instead of mutex_lock_interruptible, as these three drivers did. This patch series shouldn't change that behavior. - Rename helpers to gem_prime_get_sg_table and gem_prime_import_sg_table. Rename struct sg_table* variables to 'sgt' for clarity. - Update drm.tmpl for these new hooks. v3: - Pass the vaddr down to the driver. This lets drivers that just call vunmap on the pointer avoid having to store the pointer in their GEM private structures. - Move documentation into a /** DOC */ comment in drm_prime.c and include it in drm.tmpl with a !P line. I tried to use !F lines to include documentation of the individual functions from drmP.h, but the docproc / kernel-doc scripts barf on that file, so hopefully this is good enough for now. - apply refcount fix from commit be8a42ae60addd8b6092535c11b42d099d6470ec ("drm/prime: drop reference on imported dma-buf come from gem") Signed-off-by: Aaron Plattner Cc: Daniel Vetter Cc: David Airlie Signed-off-by: Dave Airlie --- Documentation/DocBook/drm.tmpl | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/DocBook/drm.tmpl') diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index 6c11d77c8d02..b26de523ab70 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -743,6 +743,10 @@ char *date; These two operations are mandatory for GEM drivers that support DRM PRIME. + + DRM PRIME Helper Functions Reference +!Pdrivers/gpu/drm/drm_prime.c PRIME Helpers + GEM Objects Mapping -- cgit v1.2.3