[PATCH] drm/i915: Flush the idle-worker for debugfs/i915_drop_caches

[PATCH] drm/i915: Flush the idle-worker for debugfs/i915_drop_caches

[Chris Wilson]

After being requested to idle the GPU, flush the idle worker to drop the
residual active state, and any internal object caches.

References: https://bugs.freedesktop.org/show_bug.cgi?id=102655
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 40287e9f00d7..bfcdfb6b7225 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4266,6 +4266,9 @@ i915_drop_caches_set(void *data, u64 val)
 		i915_gem_shrink_all(dev_priv);
 	fs_reclaim_release(GFP_KERNEL);
 
+	if (!READ_ONCE(dev_priv->gt.active_requests))
+		drain_delayed_work(&dev_priv->gt.idle_work);
+
 	if (val & DROP_FREED) {
 		synchronize_rcu();
 		i915_gem_drain_freed_objects(dev_priv);
-- 
2.15.0.rc1

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✗ Fi.CI.BAT: warning for drm/i915: Flush the idle-worker for debugfs/i915_drop_caches

[Patchwork]

== Series Details ==

Series: drm/i915: Flush the idle-worker for debugfs/i915_drop_caches
URL   : https://patchwork.freedesktop.org/series/32102/
State : warning

== Summary ==

Series 32102v1 drm/i915: Flush the idle-worker for debugfs/i915_drop_caches
https://patchwork.freedesktop.org/api/1.0/series/32102/revisions/1/mbox/

Test kms_cursor_legacy:
        Subgroup basic-busy-flip-before-cursor-legacy:
                pass       -> FAIL       (fi-gdg-551) fdo#102618
Test kms_pipe_crc_basic:
        Subgroup nonblocking-crc-pipe-b:
                pass       -> SKIP       (fi-hsw-4770r)

fdo#102618 https://bugs.freedesktop.org/show_bug.cgi?id=102618

fi-bdw-5557u     total:289  pass:268  dwarn:0   dfail:0   fail:0   skip:21  time:442s
fi-bdw-gvtdvm    total:289  pass:265  dwarn:0   dfail:0   fail:0   skip:24  time:454s
fi-blb-e6850     total:289  pass:223  dwarn:1   dfail:0   fail:0   skip:65  time:372s
fi-bsw-n3050     total:289  pass:243  dwarn:0   dfail:0   fail:0   skip:46  time:528s
fi-bwr-2160      total:289  pass:183  dwarn:0   dfail:0   fail:0   skip:106 time:263s
fi-bxt-dsi       total:289  pass:259  dwarn:0   dfail:0   fail:0   skip:30  time:498s
fi-bxt-j4205     total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:501s
fi-byt-j1900     total:289  pass:253  dwarn:1   dfail:0   fail:0   skip:35  time:496s
fi-byt-n2820     total:289  pass:249  dwarn:1   dfail:0   fail:0   skip:39  time:483s
fi-cfl-s         total:289  pass:253  dwarn:4   dfail:0   fail:0   skip:32  time:558s
fi-elk-e7500     total:289  pass:229  dwarn:0   dfail:0   fail:0   skip:60  time:421s
fi-gdg-551       total:289  pass:177  dwarn:1   dfail:0   fail:2   skip:109 time:261s
fi-glk-1         total:289  pass:261  dwarn:0   dfail:0   fail:0   skip:28  time:575s
fi-hsw-4770r     total:289  pass:261  dwarn:0   dfail:0   fail:0   skip:28  time:436s
fi-ilk-650       total:289  pass:228  dwarn:0   dfail:0   fail:0   skip:61  time:437s
fi-ivb-3520m     total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:497s
fi-ivb-3770      total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:460s
fi-kbl-7500u     total:289  pass:264  dwarn:1   dfail:0   fail:0   skip:24  time:489s
fi-kbl-7560u     total:289  pass:270  dwarn:0   dfail:0   fail:0   skip:19  time:574s
fi-kbl-7567u     total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:480s
fi-kbl-r         total:289  pass:262  dwarn:0   dfail:0   fail:0   skip:27  time:583s
fi-pnv-d510      total:289  pass:222  dwarn:1   dfail:0   fail:0   skip:66  time:554s
fi-skl-6260u     total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:452s
fi-skl-6700hq    total:289  pass:263  dwarn:0   dfail:0   fail:0   skip:26  time:647s
fi-skl-6700k     total:289  pass:265  dwarn:0   dfail:0   fail:0   skip:24  time:523s
fi-skl-6770hq    total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:498s
fi-skl-gvtdvm    total:289  pass:266  dwarn:0   dfail:0   fail:0   skip:23  time:461s
fi-snb-2520m     total:289  pass:250  dwarn:0   dfail:0   fail:0   skip:39  time:565s
fi-snb-2600      total:289  pass:249  dwarn:0   dfail:0   fail:0   skip:40  time:423s

e4dedb9e7c81401239b67d07ed8ed07fcd2f5129 drm-tip: 2017y-10m-17d-07h-45m-57s UTC integration manifest
b4d992753d1e drm/i915: Flush the idle-worker for debugfs/i915_drop_caches

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_6065/
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[PATCH v2] drm/i915: Flush the idle-worker for debugfs/i915_drop_caches

[Chris Wilson]

After being requested to idle the GPU, flush the idle worker to drop the
residual active state, and any internal object caches.

v2: By popular demand, introduce DROP_IDLE for fine-grained control from
userspace, though it should be used as part of a
	DROP_ACTIVE | DROP_RETIRE | DROP_IDLE | DROP_FREED
sequence.
v3: Convert to BIT() to sell it to Joonas.

References: https://bugs.freedesktop.org/show_bug.cgi?id=102655
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 5dcc702942ec..c65e381b85f3 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4179,18 +4179,20 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_ring_test_irq_fops,
 			i915_ring_test_irq_get, i915_ring_test_irq_set,
 			"0x%08llx\n");
 
-#define DROP_UNBOUND 0x1
-#define DROP_BOUND 0x2
-#define DROP_RETIRE 0x4
-#define DROP_ACTIVE 0x8
-#define DROP_FREED 0x10
-#define DROP_SHRINK_ALL 0x20
+#define DROP_UNBOUND	BIT(0)
+#define DROP_BOUND	BIT(1)
+#define DROP_RETIRE	BIT(2)
+#define DROP_ACTIVE	BIT(3)
+#define DROP_FREED	BIT(4)
+#define DROP_SHRINK_ALL	BIT(5)
+#define DROP_IDLE	BIT(6)
 #define DROP_ALL (DROP_UNBOUND	| \
 		  DROP_BOUND	| \
 		  DROP_RETIRE	| \
 		  DROP_ACTIVE	| \
 		  DROP_FREED	| \
-		  DROP_SHRINK_ALL)
+		  DROP_SHRINK_ALL |\
+		  DROP_IDLE)
 static int
 i915_drop_caches_get(void *data, u64 *val)
 {
@@ -4206,7 +4208,8 @@ i915_drop_caches_set(void *data, u64 val)
 	struct drm_device *dev = &dev_priv->drm;
 	int ret = 0;
 
-	DRM_DEBUG("Dropping caches: 0x%08llx\n", val);
+	DRM_DEBUG("Dropping caches: 0x%08llx [0x%08llx]\n",
+		  val, val & DROP_ALL);
 
 	/* No need to check and wait for gpu resets, only libdrm auto-restarts
 	 * on ioctls on -EAGAIN. */
@@ -4237,6 +4240,9 @@ i915_drop_caches_set(void *data, u64 val)
 		i915_gem_shrink_all(dev_priv);
 	fs_reclaim_release(GFP_KERNEL);
 
+	if (val & DROP_IDLE)
+		drain_delayed_work(&dev_priv->gt.idle_work);
+
 	if (val & DROP_FREED) {
 		synchronize_rcu();
 		i915_gem_drain_freed_objects(dev_priv);
-- 
2.15.0.rc1

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✓ Fi.CI.BAT: success for drm/i915: Flush the idle-worker for debugfs/i915_drop_caches (rev2)

[Patchwork]

== Series Details ==

Series: drm/i915: Flush the idle-worker for debugfs/i915_drop_caches (rev2)
URL   : https://patchwork.freedesktop.org/series/32102/
State : success

== Summary ==

Series 32102v2 drm/i915: Flush the idle-worker for debugfs/i915_drop_caches
https://patchwork.freedesktop.org/api/1.0/series/32102/revisions/2/mbox/

Test chamelium:
        Subgroup dp-crc-fast:
                fail       -> PASS       (fi-kbl-7500u) fdo#102514

fdo#102514 https://bugs.freedesktop.org/show_bug.cgi?id=102514

fi-bdw-gvtdvm    total:289  pass:265  dwarn:0   dfail:0   fail:0   skip:24  time:456s
fi-blb-e6850     total:289  pass:223  dwarn:1   dfail:0   fail:0   skip:65  time:376s
fi-bsw-n3050     total:289  pass:243  dwarn:0   dfail:0   fail:0   skip:46  time:530s
fi-bwr-2160      total:289  pass:183  dwarn:0   dfail:0   fail:0   skip:106 time:263s
fi-bxt-dsi       total:289  pass:259  dwarn:0   dfail:0   fail:0   skip:30  time:502s
fi-bxt-j4205     total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:495s
fi-byt-j1900     total:289  pass:253  dwarn:1   dfail:0   fail:0   skip:35  time:498s
fi-byt-n2820     total:289  pass:249  dwarn:1   dfail:0   fail:0   skip:39  time:479s
fi-elk-e7500     total:289  pass:229  dwarn:0   dfail:0   fail:0   skip:60  time:416s
fi-gdg-551       total:289  pass:178  dwarn:1   dfail:0   fail:1   skip:109 time:252s
fi-glk-1         total:289  pass:261  dwarn:0   dfail:0   fail:0   skip:28  time:577s
fi-hsw-4770r     total:289  pass:262  dwarn:0   dfail:0   fail:0   skip:27  time:426s
fi-ilk-650       total:289  pass:228  dwarn:0   dfail:0   fail:0   skip:61  time:440s
fi-ivb-3520m     total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:481s
fi-ivb-3770      total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:461s
fi-kbl-7500u     total:289  pass:264  dwarn:1   dfail:0   fail:0   skip:24  time:493s
fi-kbl-7560u     total:289  pass:270  dwarn:0   dfail:0   fail:0   skip:19  time:574s
fi-kbl-7567u     total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:473s
fi-kbl-r         total:289  pass:262  dwarn:0   dfail:0   fail:0   skip:27  time:579s
fi-pnv-d510      total:289  pass:222  dwarn:1   dfail:0   fail:0   skip:66  time:546s
fi-skl-6260u     total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:451s
fi-skl-6700hq    total:289  pass:263  dwarn:0   dfail:0   fail:0   skip:26  time:649s
fi-skl-6700k     total:289  pass:265  dwarn:0   dfail:0   fail:0   skip:24  time:523s
fi-skl-6770hq    total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:503s
fi-skl-gvtdvm    total:289  pass:266  dwarn:0   dfail:0   fail:0   skip:23  time:462s
fi-snb-2520m     total:289  pass:250  dwarn:0   dfail:0   fail:0   skip:39  time:567s
fi-snb-2600      total:289  pass:249  dwarn:0   dfail:0   fail:0   skip:40  time:420s
fi-bdw-5557u failed to connect after reboot

8b18ad103908e9ccee79db8c0c29bc5a56ff81f8 drm-tip: 2017y-10m-18d-08h-27m-31s UTC integration manifest
0c1e1579f102 drm/i915: Flush the idle-worker for debugfs/i915_drop_caches

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_6093/
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Re: [PATCH v2] drm/i915: Flush the idle-worker for debugfs/i915_drop_caches

[Joonas Lahtinen]

On Wed, 2017-10-18 at 13:16 +0100, Chris Wilson wrote:
> After being requested to idle the GPU, flush the idle worker to drop the
> residual active state, and any internal object caches.
> 
> v2: By popular demand, introduce DROP_IDLE for fine-grained control from
> userspace, though it should be used as part of a
> 	DROP_ACTIVE | DROP_RETIRE | DROP_IDLE | DROP_FREED
> sequence.
> v3: Convert to BIT() to sell it to Joonas.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=102655
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

<SNIP>

> @@ -4206,7 +4208,8 @@ i915_drop_caches_set(void *data, u64 val)
>  	struct drm_device *dev = &dev_priv->drm;
>  	int ret = 0;
>  
> -	DRM_DEBUG("Dropping caches: 0x%08llx\n", val);
> +	DRM_DEBUG("Dropping caches: 0x%08llx [0x%08llx]\n",
> +		  val, val & DROP_ALL);
>  
>  	/* No need to check and wait for gpu resets, only libdrm auto-restarts
>  	 * on ioctls on -EAGAIN. */
> @@ -4237,6 +4240,9 @@ i915_drop_caches_set(void *data, u64 val)
>  		i915_gem_shrink_all(dev_priv);
>  	fs_reclaim_release(GFP_KERNEL);

We have call to i915_gem_wait_for_idle (function with no kerneldoc)
above so it might be worthy to comment something along;

	/* Idling the GT will release all internal objects, too. */
> +	if (val & DROP_IDLE)
> +		drain_delayed_work(&dev_priv->gt.idle_work);

And maybe add kerneldoc for i915_gem_wait_for_idle as follow-up.

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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✗ Fi.CI.IGT: warning for drm/i915: Flush the idle-worker for debugfs/i915_drop_caches (rev2)

[Patchwork]

== Series Details ==

Series: drm/i915: Flush the idle-worker for debugfs/i915_drop_caches (rev2)
URL   : https://patchwork.freedesktop.org/series/32102/
State : warning

== Summary ==

Test perf:
        Subgroup polling:
                fail       -> PASS       (shard-hsw) fdo#102252
Test kms_cursor_crc:
        Subgroup cursor-64x64-onscreen:
                pass       -> SKIP       (shard-hsw)

fdo#102252 https://bugs.freedesktop.org/show_bug.cgi?id=102252

shard-hsw        total:2540 pass:1430 dwarn:0   dfail:0   fail:8   skip:1102 time:9224s

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_6093/shards.html
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Re: ✗ Fi.CI.IGT: warning for drm/i915: Flush the idle-worker for debugfs/i915_drop_caches (rev2)

[Chris Wilson]

Quoting Patchwork (2017-10-18 22:36:41)
> == Series Details ==
> 
> Series: drm/i915: Flush the idle-worker for debugfs/i915_drop_caches (rev2)
> URL   : https://patchwork.freedesktop.org/series/32102/
> State : warning
> 
> == Summary ==
> 
> Test perf:
>         Subgroup polling:
>                 fail       -> PASS       (shard-hsw) fdo#102252
> Test kms_cursor_crc:
>         Subgroup cursor-64x64-onscreen:
>                 pass       -> SKIP       (shard-hsw)

Double checked that indeed we didn't pass in DROP_IDLE inside igt (yet)
and pushed. Thanks for the review,
-Chris
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