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Message-ID: <c29e0af0-8d6d-a024-3aef-93ac613f8829@suse.de>
Date: Wed, 17 Feb 2021 20:22:25 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc: David Airlie <airlied@...ux.ie>,
open list <linux-kernel@...r.kernel.org>,
"open list:DRM DRIVER FOR QXL VIRTUAL GPU"
<virtualization@...ts.linux-foundation.org>,
"open list:DRM DRIVER FOR QXL VIRTUAL GPU"
<spice-devel@...ts.freedesktop.org>,
Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH v2 03/11] drm/qxl: use ttm bo priorities
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 <kraxel@...hat.com>
Acked-by: Thomas Zimmermann <tzimmermann@...e.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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