On platforms capable of allowing 8K (7680 x 4320) modes, pinning 2 or
more framebuffers/scanout buffers results in only one that is mappable/
fenceable. Therefore, pageflipping between these 2 FBs where only one
is mappable/fenceable creates latencies large enough to miss alternate
vblanks thereby producing less optimal framerate.
This mainly happens because when i915_gem_object_pin_to_display_plane()
is called to pin one of the FB objs, the associated vma is identified
as misplaced and therefore i915_vma_unbind() is called which unbinds and
evicts it. This misplaced vma gets subseqently pinned only when
i915_gem_object_ggtt_pin_ww() is called without PIN_MAPPABLE. This
results in a latency of ~10ms and happens every other vblank/repaint cycle.
Therefore, to fix this issue, we try to see if there is space to map
at-least two objects of a given size and return early if there isn't. This
would ensure that we do not try with PIN_MAPPABLE for any objects that
are too big to map thereby preventing unncessary unbind.
Testcase:
Running Weston and weston-simple-egl on an Alderlake_S (ADLS) platform
with a 8K@60 mode results in only ~40 FPS. Since upstream Weston submits
a frame ~7ms before the next vblank, the latencies seen between atomic
commit and flip event are 7, 24 (7 + 16.66), 7, 24..... suggesting that
it misses the vblank every other frame.
Here is the ftrace snippet that shows the source of the ~10ms latency:
i915_gem_object_pin_to_display_plane() {
0.102 us | i915_gem_object_set_cache_level();
i915_gem_object_ggtt_pin_ww() {
0.390 us | i915_vma_instance();
0.178 us | i915_vma_misplaced();
i915_vma_unbind() {
__i915_active_wait() {
0.082 us | i915_active_acquire_if_busy();
0.475 us | }
intel_runtime_pm_get() {
0.087 us | intel_runtime_pm_acquire();
0.259 us | }
__i915_active_wait() {
0.085 us | i915_active_acquire_if_busy();
0.240 us | }
__i915_vma_evict() {
ggtt_unbind_vma() {
gen8_ggtt_clear_range() {
10507.255 us | }
10507.689 us | }
10508.516 us | }
v2: Instead of using bigjoiner checks, determine whether a scanout
buffer is too big by checking to see if it is possible to map
two of them into the ggtt.
v3 (Ville):
- Count how many fb objects can be fit into the available holes
instead of checking for a hole twice the object size.
- Take alignment constraints into account.
- Limit this large scanout buffer check to >= Gen 11 platforms.
v4:
- Remove existing heuristic that checks just for size. (Ville)
- Return early if we find space to map at-least two objects. (Tvrtko)
- Slightly update the commit message.
v5: (Tvrtko)
- Rename the function to indicate that the object may be too big to
map into the aperture.
- Account for guard pages while calculating the total size required
for the object.
- Do not subject all objects to the heuristic check and instead
consider objects only of a certain size.
- Do the hole walk using the rbtree.
- Preserve the existing PIN_NONBLOCK logic.
- Drop the PIN_MAPPABLE check while pinning the VMA.
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 117 ++++++++++++++++++++++++--------
1 file changed, 88 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e3a2c2a0e156..752fec2b4c60 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -46,6 +46,7 @@
#include "gem/i915_gem_mman.h"
#include "gem/i915_gem_region.h"
#include "gem/i915_gem_userptr.h"
+#include "gem/i915_gem_tiling.h"
#include "gt/intel_engine_user.h"
#include "gt/intel_gt.h"
#include "gt/intel_gt_pm.h"
@@ -876,6 +877,92 @@ static void discard_ggtt_vma(struct i915_vma *vma)
spin_unlock(&obj->vma.lock);
}
+static bool
+i915_gem_object_fits_in_aperture(struct drm_i915_gem_object *obj,
+ u64 alignment, u64 flags)
+{
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
+ struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
+ struct drm_mm_node *hole;
+ u64 hole_start, hole_end, start, end;
+ u64 fence_size, fence_alignment;
+ unsigned int count = 0;
+
+ /*
+ * If the required space is larger than the available
+ * aperture, we will not able to find a slot for the
+ * object and unbinding the object now will be in
+ * vain. Worse, doing so may cause us to ping-pong
+ * the object in and out of the Global GTT and
+ * waste a lot of cycles under the mutex.
+ */
+ if (obj->base.size > ggtt->mappable_end)
+ return true;
+
+ /*
+ * If NONBLOCK is set the caller is optimistically
+ * trying to cache the full object within the mappable
+ * aperture, and *must* have a fallback in place for
+ * situations where we cannot bind the object. We
+ * can be a little more lax here and use the fallback
+ * more often to avoid costly migrations of ourselves
+ * and other objects within the aperture.
+ */
+ if (!(flags & PIN_NONBLOCK))
+ return false;
+
+ /*
+ * We only consider objects whose size is at-least a quarter of
+ * the aperture to be too big and subject them to the new
+ * heuristic below.
+ */
+ if (obj->base.size < ggtt->mappable_end / 4)
+ return false;
+
+ if (HAS_GMCH(i915) || DISPLAY_VER(i915) < 11 ||
+ !i915_gem_object_is_framebuffer(obj))
+ return false;
+
+ fence_size = i915_gem_fence_size(i915, obj->base.size,
+ i915_gem_object_get_tiling(obj),
+ i915_gem_object_get_stride(obj));
+
+ if (i915_vm_has_cache_coloring(&ggtt->vm))
+ fence_size += 2 * I915_GTT_PAGE_SIZE;
+
+ fence_alignment = i915_gem_fence_alignment(i915, obj->base.size,
+ i915_gem_object_get_tiling(obj),
+ i915_gem_object_get_stride(obj));
+ alignment = max_t(u64, alignment, fence_alignment);
+
+ /*
+ * Assuming this object is a large scanout buffer, we try to find
+ * out if there is room to map at-least two of them. There could
+ * be space available to map one but to be consistent, we try to
+ * avoid mapping/fencing any of them.
+ */
+ drm_mm_for_each_best_hole(hole, &ggtt->vm.mm, 0, ggtt->mappable_end,
+ fence_size, DRM_MM_INSERT_LOW) {
+ hole_start = drm_mm_hole_node_start(hole);
+ hole_end = hole_start + hole->hole_size;
+
+ do {
+ start = round_up(hole_start, alignment);
+ end = min_t(u64, hole_end, ggtt->mappable_end);
+
+ if (range_overflows(start, fence_size, end))
+ break;
+
+ if (++count >= 2)
+ return false;
+
+ hole_start = start + fence_size;
+ } while (1);
+ }
+
+ return true;
+}
+
struct i915_vma *
i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj,
struct i915_gem_ww_ctx *ww,
@@ -891,36 +978,8 @@ i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj,
if (flags & PIN_MAPPABLE &&
(!view || view->type == I915_GGTT_VIEW_NORMAL)) {
- /*
- * If the required space is larger than the available
- * aperture, we will not able to find a slot for the
- * object and unbinding the object now will be in
- * vain. Worse, doing so may cause us to ping-pong
- * the object in and out of the Global GTT and
- * waste a lot of cycles under the mutex.
- */
- if (obj->base.size > ggtt->mappable_end)
+ if (i915_gem_object_fits_in_aperture(obj, alignment, flags))
return ERR_PTR(-E2BIG);
-
- /*
- * If NONBLOCK is set the caller is optimistically
- * trying to cache the full object within the mappable
- * aperture, and *must* have a fallback in place for
- * situations where we cannot bind the object. We
- * can be a little more lax here and use the fallback
- * more often to avoid costly migrations of ourselves
- * and other objects within the aperture.
- *
- * Half-the-aperture is used as a simple heuristic.
- * More interesting would to do search for a free
- * block prior to making the commitment to unbind.
- * That caters for the self-harm case, and with a
- * little more heuristics (e.g. NOFAULT, NOEVICT)
- * we could try to minimise harm to others.
- */
- if (flags & PIN_NONBLOCK &&
- obj->base.size > ggtt->mappable_end / 2)
- return ERR_PTR(-ENOSPC);
}
new_vma:
--
2.34.1
