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drm/i915: Remove waiting & retiring from shrinker paths 

i915_gem_wait_for_idle() and i915_retire_requests() introduce a
dependency on the timeline->mutex. This is problematic as we want to
later perform allocations underneath i915_active.mutex, forming a link
between the shrinker, the timeline and active mutexes. Nip this cycle in
the bud by removing the acquisition of the timeline mutex (i.e.
retiring) from inside the shrinker.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190621183801.23252-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-06-21 19:37:57 +01:00
parent 2ae70d28f2
commit 9e9539800d
4 changed files with 4 additions and 14 deletions
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10
drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
View File

@ -169,7 +169,6 @@ i915_gem_shrink(struct drm_i915_private *i915,
*/
trace_i915_gem_shrink(i915, target, shrink);
i915_retire_requests(i915);
/*
* Unbinding of objects will require HW access; Let us not wake the
@ -269,8 +268,6 @@ i915_gem_shrink(struct drm_i915_private *i915,
if (shrink & I915_SHRINK_BOUND)
intel_runtime_pm_put(&i915->runtime_pm, wakeref);
i915_retire_requests(i915);
shrinker_unlock(i915, unlock);
if (nr_scanned)
@ -427,12 +424,6 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
if (!shrinker_lock(i915, 0, &unlock))
return NOTIFY_DONE;
/* Force everything onto the inactive lists */
if (i915_gem_wait_for_idle(i915,
I915_WAIT_LOCKED,
MAX_SCHEDULE_TIMEOUT))
goto out;
with_intel_runtime_pm(&i915->runtime_pm, wakeref)
freed_pages += i915_gem_shrink(i915, -1UL, NULL,
I915_SHRINK_BOUND |
@ -455,7 +446,6 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
}
mutex_unlock(&i915->ggtt.vm.mutex);
out:
shrinker_unlock(i915, unlock);
*(unsigned long *)ptr += freed_pages;

3
drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
View File

@ -427,6 +427,9 @@ create_test_object(struct i915_gem_context *ctx,
u64 size;
int err;
/* Keep in GEM's good graces */
i915_retire_requests(ctx->i915);
size = min(vm->total / 2, 1024ull * DW_PER_PAGE * PAGE_SIZE);
size = round_down(size, DW_PER_PAGE * PAGE_SIZE);

2
drivers/gpu/drm/i915/gt/intel_gt_types.h
View File

@ -26,7 +26,7 @@ struct intel_gt {
struct i915_ggtt *ggtt;
struct intel_gt_timelines {
struct mutex mutex; /* protects list, tainted by GPU */
struct mutex mutex; /* protects list */
struct list_head active_list;
/* Pack multiple timelines' seqnos into the same page */

3
drivers/gpu/drm/i915/gt/intel_timeline.c
View File

@ -268,9 +268,6 @@ static void timelines_init(struct intel_gt *gt)
spin_lock_init(&timelines->hwsp_lock);
INIT_LIST_HEAD(&timelines->hwsp_free_list);
/* via i915_gem_wait_for_idle() */
i915_gem_shrinker_taints_mutex(gt->i915, &timelines->mutex);
}
void intel_timelines_init(struct drm_i915_private *i915)