Hi Daniel Am 11.12.20 um 10:50 schrieb Daniel Vetter: [...]
+/** + * drm_gem_shmem_vmap_local - Create a virtual mapping for a shmem GEM object + * @shmem: shmem GEM object + * @map: Returns the kernel virtual address of the SHMEM GEM object's backing + * store. + * + * This function makes sure that a contiguous kernel virtual address mapping + * exists for the buffer backing the shmem GEM object. + * + * The function is called with the BO's reservation object locked. Callers must + * hold the lock until after unmapping the buffer. + * + * This function can be used to implement &drm_gem_object_funcs.vmap_local. But + * it can also be called by drivers directly, in which case it will hide the + * differences between dma-buf imported and natively allocated objects. + * + * Acquired mappings should be cleaned up by calling drm_gem_shmem_vunmap_local(). + * + * Returns: + * 0 on success or a negative error code on failure. + */ +int drm_gem_shmem_vmap_local(struct drm_gem_object *obj, struct dma_buf_map *map) +{ + struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + int ret; + + dma_resv_assert_held(obj->resv); + + ret = mutex_lock_interruptible(&shmem->vmap_lock);This bites. You need to check for shmem->import_attach and call dma_buf_vmap_local directly here before you take any shmem helper locks. Real fix would be to replace both vmap_lock and pages_lock with dma_resv lock, but that's more work. Same for vunmap_local
This comment confuses me. AFAICT vmap_lock protects vmap_use_count. Why does this exact code work in drm_gem_shmem_vmap() but not in _local() ?
Best regards Thomas
With that fixed on the helper part of this patch: Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>+ if (ret) + return ret; + ret = drm_gem_shmem_vmap_locked(shmem, map); + mutex_unlock(&shmem->vmap_lock); + + return ret; +} +EXPORT_SYMBOL(drm_gem_shmem_vmap_local); + static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem, struct dma_buf_map *map) { @@ -366,7 +406,7 @@ static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem, drm_gem_shmem_put_pages(shmem); }-/*+/** * drm_gem_shmem_vunmap - Unmap a virtual mapping fo a shmem GEM object * @shmem: shmem GEM object * @map: Kernel virtual address where the SHMEM GEM object was mapped @@ -389,6 +429,33 @@ void drm_gem_shmem_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) } EXPORT_SYMBOL(drm_gem_shmem_vunmap);+/**+ * drm_gem_shmem_vunmap_local - Unmap a virtual mapping fo a shmem GEM object + * @shmem: shmem GEM object + * @map: Kernel virtual address where the SHMEM GEM object was mapped + * + * This function cleans up a kernel virtual address mapping acquired by + * drm_gem_shmem_vmap_local(). The mapping is only removed when the use count + * drops to zero. + * + * The function is called with the BO's reservation object locked. + * + * This function can be used to implement &drm_gem_object_funcs.vmap_local. + * But it can also be called by drivers directly, in which case it will hide + * the differences between dma-buf imported and natively allocated objects. + */ +void drm_gem_shmem_vunmap_local(struct drm_gem_object *obj, struct dma_buf_map *map) +{ + struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + + dma_resv_assert_held(obj->resv); + + mutex_lock(&shmem->vmap_lock); + drm_gem_shmem_vunmap_locked(shmem, map); + mutex_unlock(&shmem->vmap_lock); +} +EXPORT_SYMBOL(drm_gem_shmem_vunmap_local); + struct drm_gem_shmem_object * drm_gem_shmem_create_with_handle(struct drm_file *file_priv, struct drm_device *dev, size_t size, diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c index 1dfc42170059..a33e28d4c5e9 100644 --- a/drivers/gpu/drm/mgag200/mgag200_mode.c +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c @@ -1552,22 +1552,32 @@ mgag200_handle_damage(struct mga_device *mdev, struct drm_framebuffer *fb, struct drm_rect *clip) { struct drm_device *dev = &mdev->base; + struct drm_gem_object *obj = fb->obj[0]; struct dma_buf_map map; void *vmap; int ret;- ret = drm_gem_shmem_vmap(fb->obj[0], &map);+ ret = dma_resv_lock(obj->resv, NULL); if (drm_WARN_ON(dev, ret)) - return; /* BUG: SHMEM BO should always be vmapped */ + return; + ret = drm_gem_shmem_vmap_local(obj, &map); + if (drm_WARN_ON(dev, ret)) + goto err_dma_resv_unlock; /* BUG: SHMEM BO should always be vmapped */ vmap = map.vaddr; /* TODO: Use mapping abstraction properly */drm_fb_memcpy_dstclip(mdev->vram, vmap, fb, clip); - drm_gem_shmem_vunmap(fb->obj[0], &map);+ drm_gem_shmem_vunmap_local(obj, &map); + dma_resv_unlock(obj->resv);/* Always scanout image at VRAM offset 0 */mgag200_set_startadd(mdev, (u32)0); mgag200_set_offset(mdev, fb); + + return; + +err_dma_resv_unlock: + dma_resv_unlock(obj->resv); }static voiddiff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c index 561c49d8657a..58c694964148 100644 --- a/drivers/gpu/drm/tiny/cirrus.c +++ b/drivers/gpu/drm/tiny/cirrus.c @@ -315,6 +315,7 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb, struct drm_rect *rect) { struct cirrus_device *cirrus = to_cirrus(fb->dev); + struct drm_gem_object *obj = fb->obj[0]; struct dma_buf_map map; void *vmap; int idx, ret; @@ -323,9 +324,12 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb, if (!drm_dev_enter(&cirrus->dev, &idx)) goto out;- ret = drm_gem_shmem_vmap(fb->obj[0], &map);+ ret = dma_resv_lock(obj->resv, NULL); if (ret) goto out_dev_exit; + ret = drm_gem_shmem_vmap_local(fb->obj[0], &map); + if (ret) + goto out_dma_resv_unlock; vmap = map.vaddr; /* TODO: Use mapping abstraction properly */if (cirrus->cpp == fb->format->cpp[0])@@ -345,9 +349,11 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb, else WARN_ON_ONCE("cpp mismatch");- drm_gem_shmem_vunmap(fb->obj[0], &map);ret = 0;+ drm_gem_shmem_vunmap_local(obj, &map);+out_dma_resv_unlock: + dma_resv_unlock(obj->resv); out_dev_exit: drm_dev_exit(idx); out: diff --git a/drivers/gpu/drm/tiny/gm12u320.c b/drivers/gpu/drm/tiny/gm12u320.c index 33f65f4626e5..b0c6e350f2b3 100644 --- a/drivers/gpu/drm/tiny/gm12u320.c +++ b/drivers/gpu/drm/tiny/gm12u320.c @@ -265,11 +265,16 @@ static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320) y1 = gm12u320->fb_update.rect.y1; y2 = gm12u320->fb_update.rect.y2;- ret = drm_gem_shmem_vmap(fb->obj[0], &map);+ ret = dma_resv_lock(fb->obj[0]->resv, NULL); if (ret) { - GM12U320_ERR("failed to vmap fb: %d\n", ret); + GM12U320_ERR("failed to reserve fb: %d\n", ret); goto put_fb; } + ret = drm_gem_shmem_vmap_local(fb->obj[0], &map); + if (ret) { + GM12U320_ERR("failed to vmap fb: %d\n", ret); + goto unlock_resv; + } vaddr = map.vaddr; /* TODO: Use mapping abstraction properly */if (fb->obj[0]->import_attach) {@@ -321,8 +326,11 @@ static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320) if (ret) GM12U320_ERR("dma_buf_end_cpu_access err: %d\n", ret); } + +unlock_resv: + dma_resv_unlock(fb->obj[0]->resv); vunmap: - drm_gem_shmem_vunmap(fb->obj[0], &map); + drm_gem_shmem_vunmap_local(fb->obj[0], &map); put_fb: drm_framebuffer_put(fb); gm12u320->fb_update.fb = NULL; diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c index 9d34ec9d03f6..46b55b4d03c2 100644 --- a/drivers/gpu/drm/udl/udl_modeset.c +++ b/drivers/gpu/drm/udl/udl_modeset.c @@ -290,14 +290,18 @@ static int udl_handle_damage(struct drm_framebuffer *fb, int x, int y, else if ((clip.x2 > fb->width) || (clip.y2 > fb->height)) return -EINVAL;+ ret = dma_resv_lock(fb->obj[0]->resv, NULL);+ if (ret) + return ret; + if (import_attach) { ret = dma_buf_begin_cpu_access(import_attach->dmabuf, DMA_FROM_DEVICE); if (ret) - return ret; + goto out_dma_resv_unlock; }- ret = drm_gem_shmem_vmap(fb->obj[0], &map);+ ret = drm_gem_shmem_vmap_local(fb->obj[0], &map); if (ret) { DRM_ERROR("failed to vmap fb\n"); goto out_dma_buf_end_cpu_access; @@ -307,7 +311,7 @@ static int udl_handle_damage(struct drm_framebuffer *fb, int x, int y, urb = udl_get_urb(dev); if (!urb) { ret = -ENOMEM; - goto out_drm_gem_shmem_vunmap; + goto out_drm_gem_shmem_vunmap_local; } cmd = urb->transfer_buffer;@@ -320,7 +324,7 @@ static int udl_handle_damage(struct drm_framebuffer *fb, int x, int y,&cmd, byte_offset, dev_byte_offset, byte_width); if (ret) - goto out_drm_gem_shmem_vunmap; + goto out_drm_gem_shmem_vunmap_local; }if (cmd > (char *)urb->transfer_buffer) {@@ -336,8 +340,8 @@ static int udl_handle_damage(struct drm_framebuffer *fb, int x, int y,ret = 0; -out_drm_gem_shmem_vunmap:- drm_gem_shmem_vunmap(fb->obj[0], &map); +out_drm_gem_shmem_vunmap_local: + drm_gem_shmem_vunmap_local(fb->obj[0], &map); out_dma_buf_end_cpu_access: if (import_attach) { tmp_ret = dma_buf_end_cpu_access(import_attach->dmabuf, @@ -345,6 +349,8 @@ static int udl_handle_damage(struct drm_framebuffer *fb, int x, int y, if (tmp_ret && !ret) ret = tmp_ret; /* only update ret if not set yet */ } +out_dma_resv_unlock: + dma_resv_unlock(fb->obj[0]->resv);return ret;} diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index 434328d8a0d9..3f59bdf749aa 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -114,7 +114,9 @@ void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem); int drm_gem_shmem_pin(struct drm_gem_object *obj); void drm_gem_shmem_unpin(struct drm_gem_object *obj); int drm_gem_shmem_vmap(struct drm_gem_object *obj, struct dma_buf_map *map); +int drm_gem_shmem_vmap_local(struct drm_gem_object *obj, struct dma_buf_map *map); void drm_gem_shmem_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map); +void drm_gem_shmem_vunmap_local(struct drm_gem_object *obj, struct dma_buf_map *map);int drm_gem_shmem_madvise(struct drm_gem_object *obj, int madv); --2.29.2
-- 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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