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drm/i915/gem: Try to flush pending unbind events

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If we cannot handle a vma within the unbind loop, try to flush the
pending events (i915_vma_parked, i915_vm_release) and try again. This
avoids a round trip to userspace that is not guaranteed to make forward
progress, as the events we wait upon require being idle.

References: cb6c3d45f9 ("drm/i915/gem: Avoid parking the vma as we unbind")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191204123556.3740002-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-12-04 12:35:56 +00:00
parent cc662126b4
commit aa5e4453dc
1 changed files with 9 additions and 1 deletions
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10
drivers/gpu/drm/i915/i915_gem.c
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@ -124,7 +124,7 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
LIST_HEAD(still_in_list);
intel_wakeref_t wakeref;
struct i915_vma *vma;
int ret = 0;
int ret;
if (!atomic_read(&obj->bind_count))
return 0;
@ -137,6 +137,8 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
*/
wakeref = intel_runtime_pm_get(rpm);
try_again:
ret = 0;
spin_lock(&obj->vma.lock);
while (!ret && (vma = list_first_entry_or_null(&obj->vma.list,
struct i915_vma,
@ -154,6 +156,7 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
} else {
if (i915_vma_is_closed(vma)) {
spin_unlock(&obj->vma.lock);
i915_vma_parked(vm->gt);
goto err_vm;
}
}
@ -175,6 +178,11 @@ err_vm:
list_splice(&still_in_list, &obj->vma.list);
spin_unlock(&obj->vma.lock);
if (ret == -EAGAIN && flags & I915_GEM_OBJECT_UNBIND_ACTIVE) {
rcu_barrier(); /* flush the i915_vm_release() */
goto try_again;
}
intel_runtime_pm_put(rpm, wakeref);
return ret;