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drm/i915: Add an rcu_barrier option to i915_drop_caches

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Sometimes a test has to wait for RCU to complete a grace period and
perform its callbacks, for example waiting for a close(fd) to actually
perform the fput(filp) and so trigger all the callbacks such as closing
GEM contexts. There is no trivial means of triggering an RCU barrier
from userspace, so add one for our convenience in
debugfs/i915_drop_caches

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191011173823.20432-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-10-11 18:38:23 +01:00
parent cbbf278778
commit 54895010a8
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/i915/i915_debugfs.c
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@ -3599,6 +3599,7 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_wedged_fops,
#define DROP_IDLE BIT(6)
#define DROP_RESET_ACTIVE BIT(7)
#define DROP_RESET_SEQNO BIT(8)
#define DROP_RCU BIT(9)
#define DROP_ALL (DROP_UNBOUND | \
DROP_BOUND | \
DROP_RETIRE | \
@ -3607,7 +3608,8 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_wedged_fops,
DROP_SHRINK_ALL |\
DROP_IDLE | \
DROP_RESET_ACTIVE | \
DROP_RESET_SEQNO)
DROP_RESET_SEQNO | \
DROP_RCU)
static int
i915_drop_caches_get(void *data, u64 *val)
{
@ -3659,6 +3661,9 @@ i915_drop_caches_set(void *data, u64 val)
i915_gem_shrink_all(i915);
fs_reclaim_release(GFP_KERNEL);
if (val & DROP_RCU)
rcu_barrier();
if (val & DROP_FREED)
i915_gem_drain_freed_objects(i915);