Am 17.02.21 um 13:32 schrieb Gerd Hoffmann:
Allow to set priorities for buffer objects.  Use priority 1 for surface
and cursor command releases.  Use priority 0 for drawing command
releases.  That way the short-living drawing commands are first in line
when it comes to eviction, making it *much* less likely that
ttm_bo_mem_force_space() picks something which can't be evicted and
throws an error after waiting a while without success.

Signed-off-by: Gerd Hoffmann <kra...@redhat.com>

Acked-by: Thomas Zimmermann <tzimmerm...@suse.de>

---
  drivers/gpu/drm/qxl/qxl_object.h  |  1 +
  drivers/gpu/drm/qxl/qxl_cmd.c     |  2 +-
  drivers/gpu/drm/qxl/qxl_display.c |  4 ++--
  drivers/gpu/drm/qxl/qxl_gem.c     |  2 +-
  drivers/gpu/drm/qxl/qxl_object.c  |  5 +++--
  drivers/gpu/drm/qxl/qxl_release.c | 18 ++++++++++++------
  6 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_object.h b/drivers/gpu/drm/qxl/qxl_object.h
index e60a8f88e226..dc1659e717f1 100644
--- a/drivers/gpu/drm/qxl/qxl_object.h
+++ b/drivers/gpu/drm/qxl/qxl_object.h
@@ -61,6 +61,7 @@ static inline u64 qxl_bo_mmap_offset(struct qxl_bo *bo)
  extern int qxl_bo_create(struct qxl_device *qdev,
                         unsigned long size,
                         bool kernel, bool pinned, u32 domain,
+                        u32 priority,
                         struct qxl_surface *surf,
                         struct qxl_bo **bo_ptr);
  extern int qxl_bo_kmap(struct qxl_bo *bo, struct dma_buf_map *map);
diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
index 7e22a81bfb36..7b00c955cd82 100644
--- a/drivers/gpu/drm/qxl/qxl_cmd.c
+++ b/drivers/gpu/drm/qxl/qxl_cmd.c
@@ -269,7 +269,7 @@ int qxl_alloc_bo_reserved(struct qxl_device *qdev,
        int ret;
ret = qxl_bo_create(qdev, size, false /* not kernel - device */,
-                           false, QXL_GEM_DOMAIN_VRAM, NULL, &bo);
+                           false, QXL_GEM_DOMAIN_VRAM, 0, NULL, &bo);
        if (ret) {
                DRM_ERROR("failed to allocate VRAM BO\n");
                return ret;
diff --git a/drivers/gpu/drm/qxl/qxl_display.c 
b/drivers/gpu/drm/qxl/qxl_display.c
index ec50d2cfd4e1..a1b5cc5918bc 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -799,8 +799,8 @@ static int qxl_plane_prepare_fb(struct drm_plane *plane,
                                qdev->dumb_shadow_bo = NULL;
                        }
                        qxl_bo_create(qdev, surf.height * surf.stride,
-                                     true, true, QXL_GEM_DOMAIN_SURFACE, &surf,
-                                     &qdev->dumb_shadow_bo);
+                                     true, true, QXL_GEM_DOMAIN_SURFACE, 0,
+                                     &surf, &qdev->dumb_shadow_bo);
                }
                if (user_bo->shadow != qdev->dumb_shadow_bo) {
                        if (user_bo->shadow) {
diff --git a/drivers/gpu/drm/qxl/qxl_gem.c b/drivers/gpu/drm/qxl/qxl_gem.c
index 48e096285b4c..a08da0bd9098 100644
--- a/drivers/gpu/drm/qxl/qxl_gem.c
+++ b/drivers/gpu/drm/qxl/qxl_gem.c
@@ -55,7 +55,7 @@ int qxl_gem_object_create(struct qxl_device *qdev, int size,
        /* At least align on page size */
        if (alignment < PAGE_SIZE)
                alignment = PAGE_SIZE;
-       r = qxl_bo_create(qdev, size, kernel, false, initial_domain, surf, 
&qbo);
+       r = qxl_bo_create(qdev, size, kernel, false, initial_domain, 0, surf, 
&qbo);
        if (r) {
                if (r != -ERESTARTSYS)
                        DRM_ERROR(
diff --git a/drivers/gpu/drm/qxl/qxl_object.c b/drivers/gpu/drm/qxl/qxl_object.c
index 705b51535492..7eada4ad217b 100644
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c
@@ -103,8 +103,8 @@ static const struct drm_gem_object_funcs qxl_object_funcs = 
{
        .print_info = drm_gem_ttm_print_info,
  };
-int qxl_bo_create(struct qxl_device *qdev,
-                 unsigned long size, bool kernel, bool pinned, u32 domain,
+int qxl_bo_create(struct qxl_device *qdev, unsigned long size,
+                 bool kernel, bool pinned, u32 domain, u32 priority,
                  struct qxl_surface *surf,
                  struct qxl_bo **bo_ptr)
  {
@@ -137,6 +137,7 @@ int qxl_bo_create(struct qxl_device *qdev,
qxl_ttm_placement_from_domain(bo, domain); + bo->tbo.priority = priority;
        r = ttm_bo_init_reserved(&qdev->mman.bdev, &bo->tbo, size, type,
                                 &bo->placement, 0, &ctx, NULL, NULL,
                                 &qxl_ttm_bo_destroy);
diff --git a/drivers/gpu/drm/qxl/qxl_release.c 
b/drivers/gpu/drm/qxl/qxl_release.c
index 579c6de10c8e..716d706ca7f0 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -160,11 +160,12 @@ qxl_release_free(struct qxl_device *qdev,
  }
static int qxl_release_bo_alloc(struct qxl_device *qdev,
-                               struct qxl_bo **bo)
+                               struct qxl_bo **bo,
+                               u32 priority)
  {
        /* pin releases bo's they are too messy to evict */
        return qxl_bo_create(qdev, PAGE_SIZE, false, true,
-                            QXL_GEM_DOMAIN_VRAM, NULL, bo);
+                            QXL_GEM_DOMAIN_VRAM, priority, NULL, bo);
  }
int qxl_release_list_add(struct qxl_release *release, struct qxl_bo *bo)
@@ -287,13 +288,18 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, 
unsigned long size,
        int ret = 0;
        union qxl_release_info *info;
        int cur_idx;
+       u32 priority;
- if (type == QXL_RELEASE_DRAWABLE)
+       if (type == QXL_RELEASE_DRAWABLE) {
                cur_idx = 0;
-       else if (type == QXL_RELEASE_SURFACE_CMD)
+               priority = 0;
+       } else if (type == QXL_RELEASE_SURFACE_CMD) {
                cur_idx = 1;
-       else if (type == QXL_RELEASE_CURSOR_CMD)
+               priority = 1;
+       } else if (type == QXL_RELEASE_CURSOR_CMD) {
                cur_idx = 2;
+               priority = 1;
+       }
        else {
                DRM_ERROR("got illegal type: %d\n", type);
                return -EINVAL;
@@ -315,7 +321,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, 
unsigned long size,
                qdev->current_release_bo[cur_idx] = NULL;
        }
        if (!qdev->current_release_bo[cur_idx]) {
-               ret = qxl_release_bo_alloc(qdev, 
&qdev->current_release_bo[cur_idx]);
+               ret = qxl_release_bo_alloc(qdev, 
&qdev->current_release_bo[cur_idx], priority);
                if (ret) {
                        mutex_unlock(&qdev->release_mutex);
                        qxl_release_free(qdev, *release);


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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