From 49a3f51dfeeecb52c5aa28c5cb9592fe5e39bf95 Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Tue, 3 Nov 2020 10:30:11 +0100 Subject: drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch replaces the vmap/vunmap's use of raw pointers in GEM object functions with instances of struct dma_buf_map. GEM backends are converted as well. For most of them, this simply changes the returned type. TTM-based drivers now return information about the location of the memory, either system or I/O memory. GEM VRAM helpers and qxl now use ttm_bo_vmap() et al. Amdgpu, nouveau and radeon use drm_gem_ttm_vmap() et al instead of implementing their own vmap callbacks. v7: * init QXL cursor to mapped BO buffer (kernel test robot) v5: * update vkms after switch to shmem v4: * use ttm_bo_vmap(), drm_gem_ttm_vmap(), et al. (Daniel, Christian) * fix a trailing { in drm_gem_vmap() * remove several empty functions instead of converting them (Daniel) * comment uses of raw pointers with a TODO (Daniel) * TODO list: convert more helpers to use struct dma_buf_map Signed-off-by: Thomas Zimmermann Acked-by: Christian König Tested-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20201103093015.1063-7-tzimmermann@suse.de --- drivers/gpu/drm/drm_gem_shmem_helper.c | 48 ++++++++++++++++++++-------------- 1 file changed, 29 insertions(+), 19 deletions(-) (limited to 'drivers/gpu/drm/drm_gem_shmem_helper.c') diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 8233bda4692f..499189c48f0b 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -258,19 +258,25 @@ void drm_gem_shmem_unpin(struct drm_gem_object *obj) } EXPORT_SYMBOL(drm_gem_shmem_unpin); -static void *drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem) +static int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem, struct dma_buf_map *map) { struct drm_gem_object *obj = &shmem->base; - struct dma_buf_map map; int ret = 0; - if (shmem->vmap_use_count++ > 0) - return shmem->vaddr; + if (shmem->vmap_use_count++ > 0) { + dma_buf_map_set_vaddr(map, shmem->vaddr); + return 0; + } if (obj->import_attach) { - ret = dma_buf_vmap(obj->import_attach->dmabuf, &map); - if (!ret) - shmem->vaddr = map.vaddr; + ret = dma_buf_vmap(obj->import_attach->dmabuf, map); + if (!ret) { + if (WARN_ON(map->is_iomem)) { + ret = -EIO; + goto err_put_pages; + } + shmem->vaddr = map->vaddr; + } } else { pgprot_t prot = PAGE_KERNEL; @@ -284,6 +290,8 @@ static void *drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem) VM_MAP, prot); if (!shmem->vaddr) ret = -ENOMEM; + else + dma_buf_map_set_vaddr(map, shmem->vaddr); } if (ret) { @@ -291,7 +299,7 @@ static void *drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem) goto err_put_pages; } - return shmem->vaddr; + return 0; err_put_pages: if (!obj->import_attach) @@ -299,12 +307,14 @@ err_put_pages: err_zero_use: shmem->vmap_use_count = 0; - return ERR_PTR(ret); + return ret; } /* * drm_gem_shmem_vmap - 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. @@ -318,26 +328,25 @@ err_zero_use: * Returns: * 0 on success or a negative error code on failure. */ -void *drm_gem_shmem_vmap(struct drm_gem_object *obj) +int drm_gem_shmem_vmap(struct drm_gem_object *obj, struct dma_buf_map *map) { struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); - void *vaddr; int ret; ret = mutex_lock_interruptible(&shmem->vmap_lock); if (ret) - return ERR_PTR(ret); - vaddr = drm_gem_shmem_vmap_locked(shmem); + return ret; + ret = drm_gem_shmem_vmap_locked(shmem, map); mutex_unlock(&shmem->vmap_lock); - return vaddr; + return ret; } EXPORT_SYMBOL(drm_gem_shmem_vmap); -static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem) +static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem, + struct dma_buf_map *map) { struct drm_gem_object *obj = &shmem->base; - struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(shmem->vaddr); if (WARN_ON_ONCE(!shmem->vmap_use_count)) return; @@ -346,7 +355,7 @@ static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem) return; if (obj->import_attach) - dma_buf_vunmap(obj->import_attach->dmabuf, &map); + dma_buf_vunmap(obj->import_attach->dmabuf, map); else vunmap(shmem->vaddr); @@ -357,6 +366,7 @@ static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *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 * * This function cleans up a kernel virtual address mapping acquired by * drm_gem_shmem_vmap(). The mapping is only removed when the use count drops to @@ -366,12 +376,12 @@ static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem) * 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(struct drm_gem_object *obj, void *vaddr) +void drm_gem_shmem_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) { struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); mutex_lock(&shmem->vmap_lock); - drm_gem_shmem_vunmap_locked(shmem); + drm_gem_shmem_vunmap_locked(shmem, map); mutex_unlock(&shmem->vmap_lock); } EXPORT_SYMBOL(drm_gem_shmem_vunmap); -- cgit v1.2.3