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Commit f1fa4f44 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Refactor testing obj->mm.pages 



Since we occasionally stuff an error pointer into obj->mm.pages for a
semi-permanent or even permanent failure, we have to be more careful and
not just test against NULL when deciding if the object has a complete
set of its concurrent pages.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171013202621.7276-1-chris@chris-wilson.co.uk
parent e4ffc83d

drivers/gpu/drm/i915/i915_drv.h

+8 −2
Original line number Diff line number Diff line
@@ -3566,10 +3566,16 @@ i915_gem_object_pin_pages(struct drm_i915_gem_object *obj) 
	return __i915_gem_object_get_pages(obj);

}



static inline bool

i915_gem_object_has_pages(struct drm_i915_gem_object *obj)

{

	return !IS_ERR_OR_NULL(READ_ONCE(obj->mm.pages));

}



static inline void

__i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)

{

	GEM_BUG_ON(!obj->mm.pages);

	GEM_BUG_ON(!i915_gem_object_has_pages(obj));



	atomic_inc(&obj->mm.pages_pin_count);

}
@@ -3583,8 +3589,8 @@ i915_gem_object_has_pinned_pages(struct drm_i915_gem_object *obj) 
static inline void

__i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)

{

	GEM_BUG_ON(!i915_gem_object_has_pages(obj));

	GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));

	GEM_BUG_ON(!obj->mm.pages);



	atomic_dec(&obj->mm.pages_pin_count);

}

drivers/gpu/drm/i915/i915_gem.c

+10 −9
Original line number Diff line number Diff line
@@ -2196,7 +2196,7 @@ void __i915_gem_object_invalidate(struct drm_i915_gem_object *obj) 
	struct address_space *mapping;



	lockdep_assert_held(&obj->mm.lock);

	GEM_BUG_ON(obj->mm.pages);

	GEM_BUG_ON(i915_gem_object_has_pages(obj));



	switch (obj->mm.madv) {

	case I915_MADV_DONTNEED:
@@ -2259,7 +2259,7 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj, 
		return;



	GEM_BUG_ON(obj->bind_count);

	if (!READ_ONCE(obj->mm.pages))

	if (!i915_gem_object_has_pages(obj))

		return;



	/* May be called by shrinker from within get_pages() (on another bo) */
@@ -2563,7 +2563,7 @@ int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj) 
	if (err)

		return err;



	if (unlikely(IS_ERR_OR_NULL(obj->mm.pages))) {

	if (unlikely(!i915_gem_object_has_pages(obj))) {

		GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj));



		err = ____i915_gem_object_get_pages(obj);
@@ -2648,7 +2648,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, 
	type &= ~I915_MAP_OVERRIDE;



	if (!atomic_inc_not_zero(&obj->mm.pages_pin_count)) {

		if (unlikely(IS_ERR_OR_NULL(obj->mm.pages))) {

		if (unlikely(!i915_gem_object_has_pages(obj))) {

			GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj));



			ret = ____i915_gem_object_get_pages(obj);
@@ -2660,7 +2660,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, 
		atomic_inc(&obj->mm.pages_pin_count);

		pinned = false;

	}

	GEM_BUG_ON(!obj->mm.pages);

	GEM_BUG_ON(!i915_gem_object_has_pages(obj));



	ptr = page_unpack_bits(obj->mm.mapping, &has_type);

	if (ptr && has_type != type) {
@@ -2715,7 +2715,7 @@ i915_gem_object_pwrite_gtt(struct drm_i915_gem_object *obj, 
	 * allows it to avoid the cost of retrieving a page (either swapin

	 * or clearing-before-use) before it is overwritten.

	 */

	if (READ_ONCE(obj->mm.pages))

	if (i915_gem_object_has_pages(obj))

		return -ENODEV;



	/* Before the pages are instantiated the object is treated as being
@@ -4278,7 +4278,7 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data, 
	if (err)

		goto out;



	if (obj->mm.pages &&

	if (i915_gem_object_has_pages(obj) &&

	    i915_gem_object_is_tiled(obj) &&

	    dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) {

		if (obj->mm.madv == I915_MADV_WILLNEED) {
@@ -4297,7 +4297,8 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data, 
		obj->mm.madv = args->madv;



	/* if the object is no longer attached, discard its backing storage */

	if (obj->mm.madv == I915_MADV_DONTNEED && !obj->mm.pages)

	if (obj->mm.madv == I915_MADV_DONTNEED &&

	    !i915_gem_object_has_pages(obj))

		i915_gem_object_truncate(obj);



	args->retained = obj->mm.madv != __I915_MADV_PURGED;
@@ -4514,7 +4515,7 @@ static void __i915_gem_free_objects(struct drm_i915_private *i915, 
		if (WARN_ON(i915_gem_object_has_pinned_pages(obj)))

			atomic_set(&obj->mm.pages_pin_count, 0);

		__i915_gem_object_put_pages(obj, I915_MM_NORMAL);

		GEM_BUG_ON(obj->mm.pages);

		GEM_BUG_ON(i915_gem_object_has_pages(obj));



		if (obj->base.import_attach)

			drm_prime_gem_destroy(&obj->base, NULL);

drivers/gpu/drm/i915/i915_gem_clflush.c

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ static const struct dma_fence_ops i915_clflush_ops = { 


static void __i915_do_clflush(struct drm_i915_gem_object *obj)

{

	GEM_BUG_ON(!i915_gem_object_has_pages(obj));

	drm_clflush_sg(obj->mm.pages);

	intel_fb_obj_flush(obj, ORIGIN_CPU);

}

drivers/gpu/drm/i915/i915_gem_render_state.c

+1 −1
Original line number Diff line number Diff line
@@ -229,7 +229,7 @@ int i915_gem_render_state_emit(struct drm_i915_gem_request *req) 
		return 0;



	/* Recreate the page after shrinking */

	if (!so->vma->obj->mm.pages)

	if (!i915_gem_object_has_pages(so->vma->obj))

		so->batch_offset = -1;



	ret = i915_vma_pin(so->vma, 0, 0, PIN_GLOBAL | PIN_HIGH);

drivers/gpu/drm/i915/i915_gem_shrinker.c

+5 −5
Original line number Diff line number Diff line
@@ -97,7 +97,7 @@ static bool swap_available(void) 


static bool can_release_pages(struct drm_i915_gem_object *obj)

{

	if (!obj->mm.pages)

	if (!i915_gem_object_has_pages(obj))

		return false;



	/* Consider only shrinkable ojects. */
@@ -129,7 +129,7 @@ static bool unsafe_drop_pages(struct drm_i915_gem_object *obj) 
{

	if (i915_gem_object_unbind(obj) == 0)

		__i915_gem_object_put_pages(obj, I915_MM_SHRINKER);

	return !READ_ONCE(obj->mm.pages);

	return !i915_gem_object_has_pages(obj);

}



/**
@@ -247,7 +247,7 @@ i915_gem_shrink(struct drm_i915_private *dev_priv, 
				/* May arrive from get_pages on another bo */

				mutex_lock_nested(&obj->mm.lock,

						  I915_MM_SHRINKER);

				if (!obj->mm.pages) {

				if (!i915_gem_object_has_pages(obj)) {

					__i915_gem_object_invalidate(obj);

					list_del_init(&obj->global_link);

					count += obj->base.size >> PAGE_SHIFT;
@@ -413,7 +413,7 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr) 
	 */

	unbound = bound = unevictable = 0;

	list_for_each_entry(obj, &dev_priv->mm.unbound_list, global_link) {

		if (!obj->mm.pages)

		if (!i915_gem_object_has_pages(obj))

			continue;



		if (!can_release_pages(obj))
@@ -422,7 +422,7 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr) 
			unbound += obj->base.size >> PAGE_SHIFT;

	}

	list_for_each_entry(obj, &dev_priv->mm.bound_list, global_link) {

		if (!obj->mm.pages)

		if (!i915_gem_object_has_pages(obj))

			continue;



		if (!can_release_pages(obj))