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authorDaniel Vetter <daniel.vetter@ffwll.ch>2021-01-22 14:36:23 +0100
committerMaarten Lankhorst <maarten.lankhorst@linux.intel.com>2021-02-09 17:16:57 +0100
commite2e2e008f96e074abf29c5f76ed7d00ea73593ec (patch)
tree5b6e5bb0ef4b1bae118ba1114c82f0cbb029b07a /Documentation/gpu
parentb9377df12114e61cb86d6470a43028b36f3e0eb6 (diff)
drm/todo: Add entry for moving to dma_resv_lock
Requested by Thomas. I think it justifies a new level, since I tried to make some forward progress on this last summer, and gave up (for now). This is very tricky. Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: "Christian K├Ânig" <christian.koenig@amd.com> Cc: linux-media@vger.kernel.org Cc: linaro-mm-sig@lists.linaro.org Link: https://patchwork.freedesktop.org/patch/msgid/20210122133624.1751802-1-daniel.vetter@ffwll.ch (cherry picked from commit 5823cca39d585e4b4a32b1292eed0015da9c3276) Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Diffstat (limited to 'Documentation/gpu')
-rw-r--r--Documentation/gpu/todo.rst19
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
index 009d8e6c7e3c..77fbfe93df56 100644
--- a/Documentation/gpu/todo.rst
+++ b/Documentation/gpu/todo.rst
@@ -23,6 +23,9 @@ Advanced: Tricky tasks that need fairly good understanding of the DRM subsystem
and graphics topics. Generally need the relevant hardware for development and
testing.
+Expert: Only attempt these if you've successfully completed some tricky
+refactorings already and are an expert in the specific area
+
Subsystem-wide refactorings
===========================
@@ -168,6 +171,22 @@ Contact: Daniel Vetter, respective driver maintainers
Level: Advanced
+Move Buffer Object Locking to dma_resv_lock()
+---------------------------------------------
+
+Many drivers have their own per-object locking scheme, usually using
+mutex_lock(). This causes all kinds of trouble for buffer sharing, since
+depending which driver is the exporter and importer, the locking hierarchy is
+reversed.
+
+To solve this we need one standard per-object locking mechanism, which is
+dma_resv_lock(). This lock needs to be called as the outermost lock, with all
+other driver specific per-object locks removed. The problem is tha rolling out
+the actual change to the locking contract is a flag day, due to struct dma_buf
+buffer sharing.
+
+Level: Expert
+
Convert logging to drm_* functions with drm_device paramater
------------------------------------------------------------