[PATCH] drm/i915: Sleep and retry a GPU reset if at first we don't succeed

[PATCH] drm/i915: Sleep and retry a GPU reset if at first we don't succeed

[Chris Wilson]

As we declare the GPU wedged if the reset fails, such a failure is quite
terminal. Before taking that drastic action, let's sleep first and try
active, in the hope that the hardware has quietened down and is then
able to reset. After a few such attempts, it is fair to say that the HW
is truly wedged.

References: https://bugs.freedesktop.org/show_bug.cgi?id=104007
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e0f053f9c186..924ebe24b282 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1877,7 +1877,9 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
 {
 	struct i915_gpu_error *error = &i915->gpu_error;
 	int ret;
+	int i;
 
+	might_sleep();
 	lockdep_assert_held(&i915->drm.struct_mutex);
 	GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, &error->flags));
 
@@ -1900,12 +1902,20 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
 		goto error;
 	}
 
-	ret = intel_gpu_reset(i915, ALL_ENGINES);
-	if (ret) {
-		if (ret != -ENODEV)
-			DRM_ERROR("Failed to reset chip: %i\n", ret);
-		else
-			DRM_DEBUG_DRIVER("GPU reset disabled\n");
+	if (!intel_has_gpu_reset(i915)) {
+		DRM_DEBUG_DRIVER("GPU reset disabled\n");
+		goto error;
+	}
+
+	for (i = 0; i < 3; i++) {
+		ret = intel_gpu_reset(i915, ALL_ENGINES);
+		if (ret == 0)
+			break;
+
+		msleep(100);
+	}
+	if (ret != -ENODEV) {
+		DRM_ERROR("Failed to reset chip: %i\n", ret);
 		goto error;
 	}
 
-- 
2.15.1

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Re: [PATCH] drm/i915: Sleep and retry a GPU reset if at first we don't succeed

[Chris Wilson]

Quoting Chris Wilson (2017-12-01 12:12:40)
> As we declare the GPU wedged if the reset fails, such a failure is quite
> terminal. Before taking that drastic action, let's sleep first and try
> active, in the hope that the hardware has quietened down and is then
> able to reset. After a few such attempts, it is fair to say that the HW
> is truly wedged.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=104007
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 22 ++++++++++++++++------
>  1 file changed, 16 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index e0f053f9c186..924ebe24b282 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1877,7 +1877,9 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
>  {
>         struct i915_gpu_error *error = &i915->gpu_error;
>         int ret;
> +       int i;
>  
> +       might_sleep();
>         lockdep_assert_held(&i915->drm.struct_mutex);
>         GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, &error->flags));
>  
> @@ -1900,12 +1902,20 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
>                 goto error;
>         }
>  
> -       ret = intel_gpu_reset(i915, ALL_ENGINES);
> -       if (ret) {
> -               if (ret != -ENODEV)
> -                       DRM_ERROR("Failed to reset chip: %i\n", ret);
> -               else
> -                       DRM_DEBUG_DRIVER("GPU reset disabled\n");
> +       if (!intel_has_gpu_reset(i915)) {
> +               DRM_DEBUG_DRIVER("GPU reset disabled\n");
> +               goto error;
> +       }
> +
> +       for (i = 0; i < 3; i++) {
> +               ret = intel_gpu_reset(i915, ALL_ENGINES);
> +               if (ret == 0)
> +                       break;
> +
> +               msleep(100);
> +       }
> +       if (ret != -ENODEV) {

Bah, was meant to be if (ret) {

> +               DRM_ERROR("Failed to reset chip: %i\n", ret);
>                 goto error;
>         }
>  
> -- 
> 2.15.1
> 
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[PATCH v2] drm/i915: Sleep and retry a GPU reset if at first we don't succeed

[Chris Wilson]

As we declare the GPU wedged if the reset fails, such a failure is quite
terminal. Before taking that drastic action, let's sleep first and try
active, in the hope that the hardware has quietened down and is then
able to reset. After a few such attempts, it is fair to say that the HW
is truly wedged.

v2: Always print the failure message now, we precheck whether resets are
disabled.

References: https://bugs.freedesktop.org/show_bug.cgi?id=104007
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e0f053f9c186..7faf20aff25a 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1877,7 +1877,9 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
 {
 	struct i915_gpu_error *error = &i915->gpu_error;
 	int ret;
+	int i;
 
+	might_sleep();
 	lockdep_assert_held(&i915->drm.struct_mutex);
 	GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, &error->flags));
 
@@ -1900,12 +1902,20 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
 		goto error;
 	}
 
-	ret = intel_gpu_reset(i915, ALL_ENGINES);
+	if (!intel_has_gpu_reset(i915)) {
+		DRM_DEBUG_DRIVER("GPU reset disabled\n");
+		goto error;
+	}
+
+	for (i = 0; i < 3; i++) {
+		ret = intel_gpu_reset(i915, ALL_ENGINES);
+		if (ret == 0)
+			break;
+
+		msleep(100);
+	}
 	if (ret) {
-		if (ret != -ENODEV)
-			DRM_ERROR("Failed to reset chip: %i\n", ret);
-		else
-			DRM_DEBUG_DRIVER("GPU reset disabled\n");
+		dev_err(i915->drm.dev, "Failed to reset chip\n");
 		goto error;
 	}
 
-- 
2.15.1

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Re: [PATCH v2] drm/i915: Sleep and retry a GPU reset if at first we don't succeed

[Mika Kuoppala]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> As we declare the GPU wedged if the reset fails, such a failure is quite
> terminal. Before taking that drastic action, let's sleep first and try
> active, in the hope that the hardware has quietened down and is then
> able to reset. After a few such attempts, it is fair to say that the HW
> is truly wedged.
>
> v2: Always print the failure message now, we precheck whether resets are
> disabled.
>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=104007
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index e0f053f9c186..7faf20aff25a 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1877,7 +1877,9 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
>  {
>  	struct i915_gpu_error *error = &i915->gpu_error;
>  	int ret;
> +	int i;
>  
> +	might_sleep();
>  	lockdep_assert_held(&i915->drm.struct_mutex);
>  	GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, &error->flags));
>  
> @@ -1900,12 +1902,20 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
>  		goto error;
>  	}
>  
> -	ret = intel_gpu_reset(i915, ALL_ENGINES);
> +	if (!intel_has_gpu_reset(i915)) {
> +		DRM_DEBUG_DRIVER("GPU reset disabled\n");
> +		goto error;
> +	}
> +
> +	for (i = 0; i < 3; i++) {
> +		ret = intel_gpu_reset(i915, ALL_ENGINES);
> +		if (ret == 0)
> +			break;
> +
> +		msleep(100);

Seems reasonable to try few times and pause between defibrillate
attempts instead of throwing dirt on top of coffin right
off the bat.

Also I have been pondering that should we add a minicheck
to intel_gpu_reset to poke that the gpu is really there.
Like doing few nops in (render)ringbuffer and see if head
moves before declaring it as a reset success?

Not that we would not see it in init right after but just
to have more precise location of failure instead of
initing a dead gpu.

Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>

-Mika


> +	}
>  	if (ret) {
> -		if (ret != -ENODEV)
> -			DRM_ERROR("Failed to reset chip: %i\n", ret);
> -		else
> -			DRM_DEBUG_DRIVER("GPU reset disabled\n");
> +		dev_err(i915->drm.dev, "Failed to reset chip\n");
>  		goto error;
>  	}
>  
> -- 
> 2.15.1
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Re: [PATCH v2] drm/i915: Sleep and retry a GPU reset if at first we don't succeed

[Chris Wilson]

Quoting Mika Kuoppala (2017-12-01 13:20:29)
> Chris Wilson <chris@chris-wilson.co.uk> writes:
> 
> > As we declare the GPU wedged if the reset fails, such a failure is quite
> > terminal. Before taking that drastic action, let's sleep first and try
> > active, in the hope that the hardware has quietened down and is then
> > able to reset. After a few such attempts, it is fair to say that the HW
> > is truly wedged.
> >
> > v2: Always print the failure message now, we precheck whether resets are
> > disabled.
> >
> > References: https://bugs.freedesktop.org/show_bug.cgi?id=104007
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
> > Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_drv.c | 20 +++++++++++++++-----
> >  1 file changed, 15 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index e0f053f9c186..7faf20aff25a 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -1877,7 +1877,9 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
> >  {
> >       struct i915_gpu_error *error = &i915->gpu_error;
> >       int ret;
> > +     int i;
> >  
> > +     might_sleep();
> >       lockdep_assert_held(&i915->drm.struct_mutex);
> >       GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, &error->flags));
> >  
> > @@ -1900,12 +1902,20 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
> >               goto error;
> >       }
> >  
> > -     ret = intel_gpu_reset(i915, ALL_ENGINES);
> > +     if (!intel_has_gpu_reset(i915)) {
> > +             DRM_DEBUG_DRIVER("GPU reset disabled\n");
> > +             goto error;
> > +     }
> > +
> > +     for (i = 0; i < 3; i++) {
> > +             ret = intel_gpu_reset(i915, ALL_ENGINES);
> > +             if (ret == 0)
> > +                     break;
> > +
> > +             msleep(100);
> 
> Seems reasonable to try few times and pause between defibrillate
> attempts instead of throwing dirt on top of coffin right
> off the bat.
> 
> Also I have been pondering that should we add a minicheck
> to intel_gpu_reset to poke that the gpu is really there.
> Like doing few nops in (render)ringbuffer and see if head
> moves before declaring it as a reset success?

That's kind of what the recovery tests. It's tricky to do so because we
would have to unwind hw state after the trial, plus we may not see a
problem until it tries to do something like write to HWSP.

> Not that we would not see it in init right after but just
> to have more precise location of failure instead of
> initing a dead gpu.

It's dead, Jim. Either way, the location should be in the post-mortem
error state capture before the first attempt to reset. As always, if
that isn't enough to diagnose the problem, we need to work harder to get
the right information into that dump. Tricky.
-Chris
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✓ Fi.CI.BAT: success for drm/i915: Sleep and retry a GPU reset if at first we don't succeed (rev2)

[Patchwork]

== Series Details ==

Series: drm/i915: Sleep and retry a GPU reset if at first we don't succeed (rev2)
URL   : https://patchwork.freedesktop.org/series/34747/
State : success

== Summary ==

Series 34747v2 drm/i915: Sleep and retry a GPU reset if at first we don't succeed
https://patchwork.freedesktop.org/api/1.0/series/34747/revisions/2/mbox/

Test debugfs_test:
        Subgroup read_all_entries:
                dmesg-warn -> DMESG-FAIL (fi-elk-e7500) fdo#103989
Test gem_mmap_gtt:
        Subgroup basic-small-bo-tiledx:
                fail       -> PASS       (fi-gdg-551) fdo#102575

fdo#103989 https://bugs.freedesktop.org/show_bug.cgi?id=103989
fdo#102575 https://bugs.freedesktop.org/show_bug.cgi?id=102575

fi-bdw-5557u     total:288  pass:267  dwarn:0   dfail:0   fail:0   skip:21  time:440s
fi-bdw-gvtdvm    total:288  pass:264  dwarn:0   dfail:0   fail:0   skip:24  time:439s
fi-blb-e6850     total:288  pass:223  dwarn:1   dfail:0   fail:0   skip:64  time:387s
fi-bsw-n3050     total:288  pass:242  dwarn:0   dfail:0   fail:0   skip:46  time:523s
fi-bwr-2160      total:288  pass:183  dwarn:0   dfail:0   fail:0   skip:105 time:283s
fi-bxt-dsi       total:288  pass:258  dwarn:0   dfail:0   fail:0   skip:30  time:511s
fi-bxt-j4205     total:288  pass:259  dwarn:0   dfail:0   fail:0   skip:29  time:511s
fi-byt-j1900     total:288  pass:253  dwarn:0   dfail:0   fail:0   skip:35  time:491s
fi-byt-n2820     total:288  pass:249  dwarn:0   dfail:0   fail:0   skip:39  time:474s
fi-elk-e7500     total:224  pass:162  dwarn:15  dfail:1   fail:0   skip:45 
fi-gdg-551       total:288  pass:179  dwarn:1   dfail:0   fail:0   skip:108 time:273s
fi-glk-1         total:288  pass:260  dwarn:0   dfail:0   fail:0   skip:28  time:551s
fi-hsw-4770      total:288  pass:261  dwarn:0   dfail:0   fail:0   skip:27  time:372s
fi-hsw-4770r     total:288  pass:224  dwarn:0   dfail:0   fail:0   skip:64  time:260s
fi-ilk-650       total:288  pass:228  dwarn:0   dfail:0   fail:0   skip:60  time:392s
fi-ivb-3520m     total:288  pass:259  dwarn:0   dfail:0   fail:0   skip:29  time:485s
fi-ivb-3770      total:288  pass:259  dwarn:0   dfail:0   fail:0   skip:29  time:455s
fi-kbl-7500u     total:288  pass:263  dwarn:1   dfail:0   fail:0   skip:24  time:489s
fi-kbl-7560u     total:288  pass:269  dwarn:0   dfail:0   fail:0   skip:19  time:533s
fi-kbl-7567u     total:288  pass:268  dwarn:0   dfail:0   fail:0   skip:20  time:476s
fi-kbl-r         total:288  pass:261  dwarn:0   dfail:0   fail:0   skip:27  time:535s
fi-pnv-d510      total:288  pass:222  dwarn:1   dfail:0   fail:0   skip:65  time:591s
fi-skl-6260u     total:288  pass:268  dwarn:0   dfail:0   fail:0   skip:20  time:449s
fi-skl-6600u     total:288  pass:261  dwarn:0   dfail:0   fail:0   skip:27  time:542s
fi-skl-6700hq    total:288  pass:262  dwarn:0   dfail:0   fail:0   skip:26  time:565s
fi-skl-6700k     total:288  pass:264  dwarn:0   dfail:0   fail:0   skip:24  time:526s
fi-skl-6770hq    total:288  pass:268  dwarn:0   dfail:0   fail:0   skip:20  time:502s
fi-skl-gvtdvm    total:288  pass:265  dwarn:0   dfail:0   fail:0   skip:23  time:447s
fi-snb-2520m     total:288  pass:249  dwarn:0   dfail:0   fail:0   skip:39  time:548s
fi-snb-2600      total:288  pass:248  dwarn:0   dfail:0   fail:0   skip:40  time:422s
Blacklisted hosts:
fi-cfl-s2        total:288  pass:262  dwarn:0   dfail:0   fail:0   skip:26  time:609s
fi-glk-dsi       total:288  pass:258  dwarn:0   dfail:0   fail:0   skip:30  time:490s

807db75b1a12167fffcae6afb925da1393cb7f15 drm-tip: 2017y-12m-01d-11h-04m-28s UTC integration manifest
cff3c9022fcc drm/i915: Sleep and retry a GPU reset if at first we don't succeed

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_7391/
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✓ Fi.CI.IGT: success for drm/i915: Sleep and retry a GPU reset if at first we don't succeed (rev2)

[Patchwork]

== Series Details ==

Series: drm/i915: Sleep and retry a GPU reset if at first we don't succeed (rev2)
URL   : https://patchwork.freedesktop.org/series/34747/
State : success

== Summary ==

Test drv_selftest:
        Subgroup mock_sanitycheck:
                pass       -> DMESG-WARN (shard-snb) fdo#102707
Test perf:
        Subgroup oa-exponents:
                pass       -> FAIL       (shard-hsw) fdo#102254
Test kms_frontbuffer_tracking:
        Subgroup fbc-1p-primscrn-indfb-pgflip-blt:
                skip       -> PASS       (shard-snb) fdo#101623
        Subgroup fbc-1p-offscren-pri-shrfb-draw-mmap-wc:
                skip       -> PASS       (shard-snb) fdo#103167
Test kms_plane:
        Subgroup plane-panning-top-left-pipe-a-planes:
                skip       -> PASS       (shard-snb)
Test kms_cursor_legacy:
        Subgroup cursora-vs-flipa-legacy:
                skip       -> PASS       (shard-snb)
Test kms_cursor_crc:
        Subgroup cursor-256x256-suspend:
                pass       -> INCOMPLETE (shard-hsw) fdo#103375
Test kms_setmode:
        Subgroup basic:
                pass       -> FAIL       (shard-hsw) fdo#99912
Test kms_flip:
        Subgroup blocking-wf_vblank:
                fail       -> PASS       (shard-snb)

fdo#102707 https://bugs.freedesktop.org/show_bug.cgi?id=102707
fdo#102254 https://bugs.freedesktop.org/show_bug.cgi?id=102254
fdo#101623 https://bugs.freedesktop.org/show_bug.cgi?id=101623
fdo#103167 https://bugs.freedesktop.org/show_bug.cgi?id=103167
fdo#103375 https://bugs.freedesktop.org/show_bug.cgi?id=103375
fdo#99912 https://bugs.freedesktop.org/show_bug.cgi?id=99912

shard-hsw        total:2624 pass:1516 dwarn:1   dfail:0   fail:11  skip:1094 time:8900s
shard-snb        total:2661 pass:1307 dwarn:2   dfail:0   fail:11  skip:1340 time:8006s
Blacklisted hosts:
shard-kbl        total:2663 pass:1793 dwarn:13  dfail:1   fail:24  skip:832 time:10909s

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_7391/shards.html
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Re: ✓ Fi.CI.IGT: success for drm/i915: Sleep and retry a GPU reset if at first we don't succeed (rev2)

[Chris Wilson]

Quoting Patchwork (2017-12-01 14:00:49)
> == Series Details ==
> 
> Series: drm/i915: Sleep and retry a GPU reset if at first we don't succeed (rev2)
> URL   : https://patchwork.freedesktop.org/series/34747/
> State : success
> 
> == Summary ==
> 
> Test drv_selftest:
>         Subgroup mock_sanitycheck:
>                 pass       -> DMESG-WARN (shard-snb) fdo#102707
> Test perf:
>         Subgroup oa-exponents:
>                 pass       -> FAIL       (shard-hsw) fdo#102254
> Test kms_frontbuffer_tracking:
>         Subgroup fbc-1p-primscrn-indfb-pgflip-blt:
>                 skip       -> PASS       (shard-snb) fdo#101623
>         Subgroup fbc-1p-offscren-pri-shrfb-draw-mmap-wc:
>                 skip       -> PASS       (shard-snb) fdo#103167
> Test kms_plane:
>         Subgroup plane-panning-top-left-pipe-a-planes:
>                 skip       -> PASS       (shard-snb)
> Test kms_cursor_legacy:
>         Subgroup cursora-vs-flipa-legacy:
>                 skip       -> PASS       (shard-snb)
> Test kms_cursor_crc:
>         Subgroup cursor-256x256-suspend:
>                 pass       -> INCOMPLETE (shard-hsw) fdo#103375
> Test kms_setmode:
>         Subgroup basic:
>                 pass       -> FAIL       (shard-hsw) fdo#99912
> Test kms_flip:
>         Subgroup blocking-wf_vblank:
>                 fail       -> PASS       (shard-snb)

And applied to see if ilk ever fumbles again. Thanks,
-Chris
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