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

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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>
Link: https://patchwork.freedesktop.org/patch/msgid/20171018121621.10824-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-10-18 13:16:21 +01:00
parent 31d1d3c886
commit b4a0b32d7a
1 changed files with 14 additions and 8 deletions
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22
drivers/gpu/drm/i915/i915_debugfs.c
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@ -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);