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drm/i915/gem: Almagamate clflushes on freeze

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When flushing objects larger than the CPU cache it is preferrable to use
a single wbinvd() rather than overlapping clflush(). At runtime, we
avoid wbinvd() due to its system-wide latencies, but during
singlethreaded suspend, no one will observe the imposed latency and we
can opt for the faster wbinvd to clear all objects in a single hit.

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/20210119214336.1463-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2021-01-19 21:43:32 +00:00
parent ac05a22cd0
commit 30d2bfd093
1 changed files with 5 additions and 11 deletions
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16
drivers/gpu/drm/i915/i915_gem.c
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@ -1175,19 +1175,13 @@ int i915_gem_freeze_late(struct drm_i915_private *i915)
* the objects as well, see i915_gem_freeze()
*/
wakeref = intel_runtime_pm_get(&i915->runtime_pm);
i915_gem_shrink(i915, -1UL, NULL, ~0);
with_intel_runtime_pm(&i915->runtime_pm, wakeref)
i915_gem_shrink(i915, -1UL, NULL, ~0);
i915_gem_drain_freed_objects(i915);
list_for_each_entry(obj, &i915->mm.shrink_list, mm.link) {
i915_gem_object_lock(obj, NULL);
drm_WARN_ON(&i915->drm,
i915_gem_object_set_to_cpu_domain(obj, true));
i915_gem_object_unlock(obj);
}
intel_runtime_pm_put(&i915->runtime_pm, wakeref);
wbinvd_on_all_cpus();
list_for_each_entry(obj, &i915->mm.shrink_list, mm.link)
__start_cpu_write(obj);
return 0;
}