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From:   Gerd Hoffmann <kraxel@redhat.com>
To:     dri-devel@lists.freedesktop.org
Cc:     Gerd Hoffmann <kraxel@redhat.com>,
        Dave Airlie <airlied@redhat.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        virtualization@lists.linux-foundation.org (open list:DRM DRIVER FOR QXL
        VIRTUAL GPU),
        spice-devel@lists.freedesktop.org (open list:DRM DRIVER FOR QXL VIRTUAL
        GPU), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH 03/10] drm/qxl: use ttm bo priorities
Date:   Tue, 16 Feb 2021 12:37:09 +0100
Message-Id: <20210216113716.716996-4-kraxel@redhat.com>
In-Reply-To: <20210216113716.716996-1-kraxel@redhat.com>
References: <20210216113716.716996-1-kraxel@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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 <kraxel@redhat.com>
---
 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 | 19 +++++++++++++------
 6 files changed, 21 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 63818b56218c..a831184e014a 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -161,11 +161,12 @@ 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)
@@ -288,13 +289,19 @@ 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;
@@ -316,7 +323,7 @@ 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);
-- 
2.29.2