This is a note to let you know that I've just added the patch titled
drm/nv50-/mc: fix kms pageflip events by reordering irq handling order.
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-nv50-mc-fix-kms-pageflip-events-by-reordering-irq-handling-order.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dcfb1009df3b4ad8d2e0779dd45b438629d6858a Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Date: Wed, 19 Mar 2014 08:12:51 +0100
Subject: drm/nv50-/mc: fix kms pageflip events by reordering irq handling order.
From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
commit dcfb1009df3b4ad8d2e0779dd45b438629d6858a upstream.
Whenever a single nouveau_mc_intr() main gpu irq-handler invocation was
responsible for calling both, the vblank-irq handler (display engine irq)
and kms-pageflip completion handler (from fifo irq), the order of
invocation was wrong. nouveau_finish_flip() was called before
drm_handle_vblank() for the vblank of pageflip completion, so the
emitted pageflip event contained stale vblank count and timestamp
from previous vblank. This caused failure in userspace to timestamp
properly.
Reorder order of invocation of engine irq handlers: Put
NVDEV_ENGINE_DISP always on top, and thereby before NVDEV_ENGINE_FIFO,
so that drm_handle_vblank() gets called to update vblank timestamps
and count before potential pageflip events make use of that
information.
This works on nv-50 and later, where kms-pageflip completion triggers
an irq either after a separate vblank irq, or both pageflip and vblank
trigger one common irq invocation, but never before vblank irqs.
v2 (Ben):
- removed mods for nv04-nv40, it doesn't help there anyway
- this is considered a hack, and a better solution should be found
Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/nouveau/core/subdev/mc/nv50.c | 2 +-
drivers/gpu/drm/nouveau/core/subdev/mc/nv98.c | 2 +-
drivers/gpu/drm/nouveau/core/subdev/mc/nvc0.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/nouveau/core/subdev/mc/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/mc/nv50.c
@@ -26,6 +26,7 @@
const struct nouveau_mc_intr
nv50_mc_intr[] = {
+ { 0x04000000, NVDEV_ENGINE_DISP }, /* DISP before FIFO, so pageflip-timestamping works! */
{ 0x00000001, NVDEV_ENGINE_MPEG },
{ 0x00000100, NVDEV_ENGINE_FIFO },
{ 0x00001000, NVDEV_ENGINE_GR },
@@ -34,7 +35,6 @@ nv50_mc_intr[] = {
{ 0x00020000, NVDEV_ENGINE_VP }, /* NV84- */
{ 0x00100000, NVDEV_SUBDEV_TIMER },
{ 0x00200000, NVDEV_SUBDEV_GPIO },
- { 0x04000000, NVDEV_ENGINE_DISP },
{ 0x10000000, NVDEV_SUBDEV_BUS },
{ 0x80000000, NVDEV_ENGINE_SW },
{ 0x0002d101, NVDEV_SUBDEV_FB },
--- a/drivers/gpu/drm/nouveau/core/subdev/mc/nv98.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/mc/nv98.c
@@ -26,6 +26,7 @@
static const struct nouveau_mc_intr
nv98_mc_intr[] = {
+ { 0x04000000, NVDEV_ENGINE_DISP }, /* DISP first, so pageflip timestamps work */
{ 0x00000001, NVDEV_ENGINE_PPP },
{ 0x00000100, NVDEV_ENGINE_FIFO },
{ 0x00001000, NVDEV_ENGINE_GR },
@@ -37,7 +38,6 @@ nv98_mc_intr[] = {
{ 0x00100000, NVDEV_SUBDEV_TIMER },
{ 0x00200000, NVDEV_SUBDEV_GPIO },
{ 0x00400000, NVDEV_ENGINE_COPY0 }, /* NVA3- */
- { 0x04000000, NVDEV_ENGINE_DISP },
{ 0x10000000, NVDEV_SUBDEV_BUS },
{ 0x80000000, NVDEV_ENGINE_SW },
{ 0x0042d101, NVDEV_SUBDEV_FB },
--- a/drivers/gpu/drm/nouveau/core/subdev/mc/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/mc/nvc0.c
@@ -26,6 +26,7 @@
const struct nouveau_mc_intr
nvc0_mc_intr[] = {
+ { 0x04000000, NVDEV_ENGINE_DISP }, /* DISP first, so pageflip timestamps work. */
{ 0x00000001, NVDEV_ENGINE_PPP },
{ 0x00000020, NVDEV_ENGINE_COPY0 },
{ 0x00000040, NVDEV_ENGINE_COPY1 },
@@ -40,7 +41,6 @@ nvc0_mc_intr[] = {
{ 0x00200000, NVDEV_SUBDEV_GPIO },
{ 0x01000000, NVDEV_SUBDEV_PWR },
{ 0x02000000, NVDEV_SUBDEV_LTCG },
- { 0x04000000, NVDEV_ENGINE_DISP },
{ 0x08000000, NVDEV_SUBDEV_FB },
{ 0x10000000, NVDEV_SUBDEV_BUS },
{ 0x40000000, NVDEV_SUBDEV_IBUS },
Patches currently in stable-queue which might be from mario.kleiner.de@xxxxxxxxx are
queue-3.15/drm-nouveau-kms-reference-vblank-for-crtc-during-pageflip.patch
queue-3.15/drm-nouveau-disp-nv04-nv40-abort-scanoutpos-query-on-vga-analog.patch
queue-3.15/drm-nouveau-kms-nv04-nv40-fix-pageflip-events-via-special-case.patch
queue-3.15/drm-nv50-mc-fix-kms-pageflip-events-by-reordering-irq-handling-order.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html