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drm/i915/gem: Drop lru bumping on display unpinning

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Simplify the frontbuffer unpin by removing the lock requirement. The LRU
bumping was primarily to protect the GTT from being evicted and from
frontbuffers being eagerly shrunk. Now we protect frontbuffers from the
shrinker, and we avoid accidentally evicting from the GTT, so the
benefit from bumping LRU is no more, and we can save more time by not.

Reported-and-tested-by: Matti Hämäläinen <ccr@tnsp.org>
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2905
Fixes: c1793ba86a ("drm/i915: Add ww locking to pin_to_display_plane, v2.")
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/20210119214336.1463-6-chris@chris-wilson.co.uk
(cherry picked from commit 14ca83eece)
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: <stable@vger.kernel.org> # v5.10+
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2021-01-25 13:21:58 +00:00 committed by Jani Nikula
parent e4747cb3ec
commit 761c70a525
4 changed files with 4 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/i915/display/intel_display.c
View File

@ -2309,7 +2309,7 @@ intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
*/
ret = i915_vma_pin_fence(vma);
if (ret != 0 && INTEL_GEN(dev_priv) < 4) {
i915_gem_object_unpin_from_display_plane(vma);
i915_vma_unpin(vma);
vma = ERR_PTR(ret);
goto err;
}
@ -2327,12 +2327,9 @@ err:
void intel_unpin_fb_vma(struct i915_vma *vma, unsigned long flags)
{
i915_gem_object_lock(vma->obj, NULL);
if (flags & PLANE_HAS_FENCE)
i915_vma_unpin_fence(vma);
i915_gem_object_unpin_from_display_plane(vma);
i915_gem_object_unlock(vma->obj);
i915_vma_unpin(vma);
i915_vma_put(vma);
}

4
drivers/gpu/drm/i915/display/intel_overlay.c
View File

@ -359,7 +359,7 @@ static void intel_overlay_release_old_vma(struct intel_overlay *overlay)
intel_frontbuffer_flip_complete(overlay->i915,
INTEL_FRONTBUFFER_OVERLAY(overlay->crtc->pipe));
i915_gem_object_unpin_from_display_plane(vma);
i915_vma_unpin(vma);
i915_vma_put(vma);
}
@ -860,7 +860,7 @@ static int intel_overlay_do_put_image(struct intel_overlay *overlay,
return 0;
out_unpin:
i915_gem_object_unpin_from_display_plane(vma);
i915_vma_unpin(vma);
out_pin_section:
atomic_dec(&dev_priv->gpu_error.pending_fb_pin);

45
drivers/gpu/drm/i915/gem/i915_gem_domain.c
View File

@ -387,48 +387,6 @@ err:
return vma;
}
static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct i915_vma *vma;
if (list_empty(&obj->vma.list))
return;
mutex_lock(&i915->ggtt.vm.mutex);
spin_lock(&obj->vma.lock);
for_each_ggtt_vma(vma, obj) {
if (!drm_mm_node_allocated(&vma->node))
continue;
GEM_BUG_ON(vma->vm != &i915->ggtt.vm);
list_move_tail(&vma->vm_link, &vma->vm->bound_list);
}
spin_unlock(&obj->vma.lock);
mutex_unlock(&i915->ggtt.vm.mutex);
if (i915_gem_object_is_shrinkable(obj)) {
unsigned long flags;
spin_lock_irqsave(&i915->mm.obj_lock, flags);
if (obj->mm.madv == I915_MADV_WILLNEED &&
!atomic_read(&obj->mm.shrink_pin))
list_move_tail(&obj->mm.link, &i915->mm.shrink_list);
spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
}
}
void
i915_gem_object_unpin_from_display_plane(struct i915_vma *vma)
{
/* Bump the LRU to try and avoid premature eviction whilst flipping */
i915_gem_object_bump_inactive_ggtt(vma->obj);
i915_vma_unpin(vma);
}
/**
* Moves a single object to the CPU read, and possibly write domain.
* @obj: object to act on
@ -569,9 +527,6 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
else
err = i915_gem_object_set_to_cpu_domain(obj, write_domain);
/* And bump the LRU for this access */
i915_gem_object_bump_inactive_ggtt(obj);
i915_gem_object_unlock(obj);
if (write_domain)

1
drivers/gpu/drm/i915/gem/i915_gem_object.h
View File

@ -486,7 +486,6 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
u32 alignment,
const struct i915_ggtt_view *view,
unsigned int flags);
void i915_gem_object_unpin_from_display_plane(struct i915_vma *vma);
void i915_gem_object_make_unshrinkable(struct drm_i915_gem_object *obj);
void i915_gem_object_make_shrinkable(struct drm_i915_gem_object *obj);