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Message-ID: <540D7267.6040003@daenzer.net>
Date: Mon, 08 Sep 2014 18:09:59 +0900
From: Michel Dänzer <michel@...nzer.net>
To: Mikael Pettersson <mikpelinux@...il.com>
CC: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [BISECTED] 3.17-rc1 radeon screen corruption due to "Always flush
the HDP cache before submitting a CS to the GPU"
On 06.09.2014 01:49, Mikael Pettersson wrote:
> Michel Dänzer writes:
> > On 30.08.2014 22:59, Mikael Pettersson wrote:
> > > Since 3.17-rc1 my radeon card (RV370 / X1050 card) causes screen corruption
> > > after a while in X + firefox. This still occurs with yesterday's HEAD
> > > of Linus' repo. 3.16 and ealier kernels are fine.
> > >
> > > I ran a bisect, which identified:
> > >
> > > commit 72a9987edcedb89db988079a03c9b9c65b6ec9ac
> > > Author: Michel Dänzer <michel.daenzer@....com>
> > > Date: Thu Jul 31 18:43:49 2014 +0900
> > >
> > > drm/radeon: Always flush the HDP cache before submitting a CS to the GPU
> > >
> > > as the cause of my screen corruption. Reverting this from 3.17-rc2
> > > (which requires manual intervention due to subsequent changes in
> > > radeon_ring_commit()) eliminates the screen corruption.
> >
> > Does the patch below help?
>
> Tested, sorry no joy. I first reconfirmed the screen corruption with 3.17-rc3.
> I then applied this and rebuilt/rebooted, and after a few minutes X had a hickup
> (screen went black, came back after a few seconds, but then no cursor or
> reaction to mouse events), but I was able to kill it via my Terminate_Server
> key binding.
I was afraid so, thanks for testing it.
I can't see any other option than the patch below then. Can you confirm that this
fixes the screen corruption?
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 4c5ec44..b0098e7 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -821,6 +821,20 @@ u32 r100_get_vblank_counter(struct radeon_device *rdev, int crtc)
return RREG32(RADEON_CRTC2_CRNT_FRAME);
}
+/**
+ * r100_ring_hdp_flush - flush Host Data Path via the ring buffer
+ * rdev: radeon device structure
+ * ring: ring buffer struct for emitting packets
+ */
+static void r100_ring_hdp_flush(struct radeon_device *rdev, struct radeon_ring *ring)
+{
+ radeon_ring_write(ring, PACKET0(RADEON_HOST_PATH_CNTL, 0));
+ radeon_ring_write(ring, rdev->config.r100.hdp_cntl |
+ RADEON_HDP_READ_BUFFER_INVALIDATE);
+ radeon_ring_write(ring, PACKET0(RADEON_HOST_PATH_CNTL, 0));
+ radeon_ring_write(ring, rdev->config.r100.hdp_cntl);
+}
+
/* Who ever call radeon_fence_emit should call ring_lock and ask
* for enough space (today caller are ib schedule and buffer move) */
void r100_fence_ring_emit(struct radeon_device *rdev,
@@ -1056,20 +1070,6 @@ void r100_gfx_set_wptr(struct radeon_device *rdev,
(void)RREG32(RADEON_CP_RB_WPTR);
}
-/**
- * r100_ring_hdp_flush - flush Host Data Path via the ring buffer
- * rdev: radeon device structure
- * ring: ring buffer struct for emitting packets
- */
-void r100_ring_hdp_flush(struct radeon_device *rdev, struct radeon_ring *ring)
-{
- radeon_ring_write(ring, PACKET0(RADEON_HOST_PATH_CNTL, 0));
- radeon_ring_write(ring, rdev->config.r100.hdp_cntl |
- RADEON_HDP_READ_BUFFER_INVALIDATE);
- radeon_ring_write(ring, PACKET0(RADEON_HOST_PATH_CNTL, 0));
- radeon_ring_write(ring, rdev->config.r100.hdp_cntl);
-}
-
static void r100_cp_load_microcode(struct radeon_device *rdev)
{
const __be32 *fw_data;
diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c
index eeeeabe..2dd5847 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.c
+++ b/drivers/gpu/drm/radeon/radeon_asic.c
@@ -185,7 +185,6 @@ static struct radeon_asic_ring r100_gfx_ring = {
.get_rptr = &r100_gfx_get_rptr,
.get_wptr = &r100_gfx_get_wptr,
.set_wptr = &r100_gfx_set_wptr,
- .hdp_flush = &r100_ring_hdp_flush,
};
static struct radeon_asic r100_asic = {
@@ -332,7 +331,6 @@ static struct radeon_asic_ring r300_gfx_ring = {
.get_rptr = &r100_gfx_get_rptr,
.get_wptr = &r100_gfx_get_wptr,
.set_wptr = &r100_gfx_set_wptr,
- .hdp_flush = &r100_ring_hdp_flush,
};
static struct radeon_asic r300_asic = {
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index 275a5dc..7756bc1 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -148,8 +148,7 @@ u32 r100_gfx_get_wptr(struct radeon_device *rdev,
struct radeon_ring *ring);
void r100_gfx_set_wptr(struct radeon_device *rdev,
struct radeon_ring *ring);
-void r100_ring_hdp_flush(struct radeon_device *rdev,
- struct radeon_ring *ring);
+
/*
* r200,rv250,rs300,rv280
*/
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index a773830..ef5b60a 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -83,7 +83,7 @@
* CIK: 1D and linear tiling modes contain valid PIPE_CONFIG
* 2.39.0 - Add INFO query for number of active CUs
* 2.40.0 - Add RADEON_GEM_GTT_WC/UC, flush HDP cache before submitting
- * CS to GPU
+ * CS to GPU on >= r600
*/
#define KMS_DRIVER_MAJOR 2
#define KMS_DRIVER_MINOR 40
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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