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Tue, 20 Oct 2020 13:39:50 +0000 Subject: Re: [PATCH v5 05/10] drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers To: Thomas Zimmermann , maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@linux.ie, daniel@ffwll.ch, sam@ravnborg.org, alexander.deucher@amd.com, kraxel@redhat.com, l.stach@pengutronix.de, linux+etnaviv@armlinux.org.uk, christian.gmeiner@gmail.com, inki.dae@samsung.com, jy0922.shim@samsung.com, sw0312.kim@samsung.com, kyungmin.park@samsung.com, kgene@kernel.org, krzk@kernel.org, yuq825@gmail.com, bskeggs@redhat.com, robh@kernel.org, tomeu.vizoso@collabora.com, steven.price@arm.com, alyssa.rosenzweig@collabora.com, hjc@rock-chips.com, heiko@sntech.de, hdegoede@redhat.com, sean@poorly.run, eric@anholt.net, oleksandr_andrushchenko@epam.com, ray.huang@amd.com, sumit.semwal@linaro.org, emil.velikov@collabora.com, luben.tuikov@amd.com, apaneers@amd.com, linus.walleij@linaro.org, melissa.srw@gmail.com, chris@chris-wilson.co.uk, miaoqinglang@huawei.com Cc: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux-foundation.org, etnaviv@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, lima@lists.freedesktop.org, nouveau@lists.freedesktop.org, spice-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, xen-devel@lists.xenproject.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, Daniel Vetter References: <20201020122046.31167-1-tzimmermann@suse.de> <20201020122046.31167-6-tzimmermann@suse.de> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <0d936127-ff9b-ace1-97b8-bdbc01921a65@amd.com> Date: Tue, 20 Oct 2020 15:39:35 +0200 User-Agent: Mozilla/5.0 (X11; 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X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: QvusYaEJ9X1ocSxHJDO7zzVLFArw/xLRGeFQXXgs7ue5Et0DBV4W6wnP4nEGhplE0exsjKFdih5AFpaO4cRf+9cEhaztFsYxgPCeKBP5LDg4cNOhNt7VS0VvO3IEhKrN0dJ/6IvsgQx0svWkwWT4GJibLAilL+G7Hqwf4Up08W5sGYUwJfLAAMFhPdbdYxLTZEDRY+dvuGNTmZ2DdN5OER2B+NFrFk/n6r6HCq2tGMKNadvZ3nkFj68UbUjLGUNFl3ZAVYCK1DybuiQ1AUzVrLk11bX5g2ElEIDEW6u6V58rS0mACUKNRIcaK4AufpG34SoBgRmGIgmbUc+P3m3ztXoJb+SjtDiV31oRg97i96ghJor4+MGVk3XMmx3vHYfBg+Pz8/nKEoojK4Cm0bHc6Q== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN2PR12MB3775.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(396003)(366004)(346002)(39860400002)(376002)(136003)(7416002)(36756003)(316002)(7406005)(8676002)(31696002)(6486002)(2906002)(4326008)(16526019)(186003)(478600001)(2616005)(52116002)(8936002)(66946007)(66476007)(66556008)(83380400001)(86362001)(5660300002)(6666004)(31686004)(921003)(43740500002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 43684d1a-3b9c-422c-7318-08d874fd9dc0 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB3775.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Oct 2020 13:39:50.1814 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: c8RgvKt9S4Nq3RhDPJfN3dHb/5uTiTRNW42pC37NdmMjd5S95Q3zNocaKAgu3yIa X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4357 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Am 20.10.20 um 14:20 schrieb Thomas Zimmermann: > The new functions ttm_bo_{vmap,vunmap}() map and unmap a TTM BO in kernel > address space. The mapping's address is returned as struct dma_buf_map. > Each function is a simplified version of TTM's existing kmap code. Both > functions respect the memory's location ani/or writecombine flags. > > On top TTM's functions, GEM TTM helpers got drm_gem_ttm_{vmap,vunmap}(), > two helpers that convert a GEM object into the TTM BO and forward the call > to TTM's vmap/vunmap. These helpers can be dropped into the rsp GEM object > callbacks. > > v5: > * use size_t for storing mapping size (Christian) > * ignore premapped memory areas correctly in ttm_bo_vunmap() > * rebase onto latest TTM interfaces (Christian) > * remove BUG() from ttm_bo_vmap() (Christian) > v4: > * drop ttm_kmap_obj_to_dma_buf() in favor of vmap helpers (Daniel, > Christian) > > Signed-off-by: Thomas Zimmermann > Acked-by: Daniel Vetter > Tested-by: Sam Ravnborg Reviewed-by: Christian König > --- > drivers/gpu/drm/drm_gem_ttm_helper.c | 38 +++++++++++++++ > drivers/gpu/drm/ttm/ttm_bo_util.c | 72 ++++++++++++++++++++++++++++ > include/drm/drm_gem_ttm_helper.h | 6 +++ > include/drm/ttm/ttm_bo_api.h | 28 +++++++++++ > include/linux/dma-buf-map.h | 20 ++++++++ > 5 files changed, 164 insertions(+) > > diff --git a/drivers/gpu/drm/drm_gem_ttm_helper.c b/drivers/gpu/drm/drm_gem_ttm_helper.c > index 0e4fb9ba43ad..db4c14d78a30 100644 > --- a/drivers/gpu/drm/drm_gem_ttm_helper.c > +++ b/drivers/gpu/drm/drm_gem_ttm_helper.c > @@ -49,6 +49,44 @@ void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent, > } > EXPORT_SYMBOL(drm_gem_ttm_print_info); > > +/** > + * drm_gem_ttm_vmap() - vmap &ttm_buffer_object > + * @gem: GEM object. > + * @map: [out] returns the dma-buf mapping. > + * > + * Maps a GEM object with ttm_bo_vmap(). This function can be used as > + * &drm_gem_object_funcs.vmap callback. > + * > + * Returns: > + * 0 on success, or a negative errno code otherwise. > + */ > +int drm_gem_ttm_vmap(struct drm_gem_object *gem, > + struct dma_buf_map *map) > +{ > + struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem); > + > + return ttm_bo_vmap(bo, map); > + > +} > +EXPORT_SYMBOL(drm_gem_ttm_vmap); > + > +/** > + * drm_gem_ttm_vunmap() - vunmap &ttm_buffer_object > + * @gem: GEM object. > + * @map: dma-buf mapping. > + * > + * Unmaps a GEM object with ttm_bo_vunmap(). This function can be used as > + * &drm_gem_object_funcs.vmap callback. > + */ > +void drm_gem_ttm_vunmap(struct drm_gem_object *gem, > + struct dma_buf_map *map) > +{ > + struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem); > + > + ttm_bo_vunmap(bo, map); > +} > +EXPORT_SYMBOL(drm_gem_ttm_vunmap); > + > /** > * drm_gem_ttm_mmap() - mmap &ttm_buffer_object > * @gem: GEM object. > diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c > index ba7ab5ed85d0..5c79418405ea 100644 > --- a/drivers/gpu/drm/ttm/ttm_bo_util.c > +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c > @@ -32,6 +32,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -527,6 +528,77 @@ void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map) > } > EXPORT_SYMBOL(ttm_bo_kunmap); > > +int ttm_bo_vmap(struct ttm_buffer_object *bo, struct dma_buf_map *map) > +{ > + struct ttm_resource *mem = &bo->mem; > + int ret; > + > + ret = ttm_mem_io_reserve(bo->bdev, mem); > + if (ret) > + return ret; > + > + if (mem->bus.is_iomem) { > + void __iomem *vaddr_iomem; > + size_t size = bo->num_pages << PAGE_SHIFT; > + > + if (mem->bus.addr) > + vaddr_iomem = (void __iomem *)mem->bus.addr; > + else if (mem->bus.caching == ttm_write_combined) > + vaddr_iomem = ioremap_wc(mem->bus.offset, size); > + else > + vaddr_iomem = ioremap(mem->bus.offset, size); > + > + if (!vaddr_iomem) > + return -ENOMEM; > + > + dma_buf_map_set_vaddr_iomem(map, vaddr_iomem); > + > + } else { > + struct ttm_operation_ctx ctx = { > + .interruptible = false, > + .no_wait_gpu = false > + }; > + struct ttm_tt *ttm = bo->ttm; > + pgprot_t prot; > + void *vaddr; > + > + ret = ttm_tt_populate(bo->bdev, ttm, &ctx); > + if (ret) > + return ret; > + > + /* > + * We need to use vmap to get the desired page protection > + * or to make the buffer object look contiguous. > + */ > + prot = ttm_io_prot(bo, mem, PAGE_KERNEL); > + vaddr = vmap(ttm->pages, bo->num_pages, 0, prot); > + if (!vaddr) > + return -ENOMEM; > + > + dma_buf_map_set_vaddr(map, vaddr); > + } > + > + return 0; > +} > +EXPORT_SYMBOL(ttm_bo_vmap); > + > +void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct dma_buf_map *map) > +{ > + struct ttm_resource *mem = &bo->mem; > + > + if (dma_buf_map_is_null(map)) > + return; > + > + if (!map->is_iomem) > + vunmap(map->vaddr); > + else if (!mem->bus.addr) > + iounmap(map->vaddr_iomem); > + dma_buf_map_clear(map); > + > + ttm_mem_io_free(bo->bdev, &bo->mem); > +} > +EXPORT_SYMBOL(ttm_bo_vunmap); > + > static int ttm_bo_wait_free_node(struct ttm_buffer_object *bo, > bool dst_use_tt) > { > diff --git a/include/drm/drm_gem_ttm_helper.h b/include/drm/drm_gem_ttm_helper.h > index 118cef76f84f..7c6d874910b8 100644 > --- a/include/drm/drm_gem_ttm_helper.h > +++ b/include/drm/drm_gem_ttm_helper.h > @@ -10,11 +10,17 @@ > #include > #include > > +struct dma_buf_map; > + > #define drm_gem_ttm_of_gem(gem_obj) \ > container_of(gem_obj, struct ttm_buffer_object, base) > > void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent, > const struct drm_gem_object *gem); > +int drm_gem_ttm_vmap(struct drm_gem_object *gem, > + struct dma_buf_map *map); > +void drm_gem_ttm_vunmap(struct drm_gem_object *gem, > + struct dma_buf_map *map); > int drm_gem_ttm_mmap(struct drm_gem_object *gem, > struct vm_area_struct *vma); > > diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h > index 37102e45e496..2c59a785374c 100644 > --- a/include/drm/ttm/ttm_bo_api.h > +++ b/include/drm/ttm/ttm_bo_api.h > @@ -48,6 +48,8 @@ struct ttm_bo_global; > > struct ttm_bo_device; > > +struct dma_buf_map; > + > struct drm_mm_node; > > struct ttm_placement; > @@ -494,6 +496,32 @@ int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page, > */ > void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map); > > +/** > + * ttm_bo_vmap > + * > + * @bo: The buffer object. > + * @map: pointer to a struct dma_buf_map representing the map. > + * > + * Sets up a kernel virtual mapping, using ioremap or vmap to the > + * data in the buffer object. The parameter @map returns the virtual > + * address as struct dma_buf_map. Unmap the buffer with ttm_bo_vunmap(). > + * > + * Returns > + * -ENOMEM: Out of memory. > + * -EINVAL: Invalid range. > + */ > +int ttm_bo_vmap(struct ttm_buffer_object *bo, struct dma_buf_map *map); > + > +/** > + * ttm_bo_vunmap > + * > + * @bo: The buffer object. > + * @map: Object describing the map to unmap. > + * > + * Unmaps a kernel map set up by ttm_bo_vmap(). > + */ > +void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct dma_buf_map *map); > + > /** > * ttm_bo_mmap_obj - mmap memory backed by a ttm buffer object. > * > diff --git a/include/linux/dma-buf-map.h b/include/linux/dma-buf-map.h > index fd1aba545fdf..2e8bbecb5091 100644 > --- a/include/linux/dma-buf-map.h > +++ b/include/linux/dma-buf-map.h > @@ -45,6 +45,12 @@ > * > * dma_buf_map_set_vaddr(&map. 0xdeadbeaf); > * > + * To set an address in I/O memory, use dma_buf_map_set_vaddr_iomem(). > + * > + * .. code-block:: c > + * > + * dma_buf_map_set_vaddr_iomem(&map. 0xdeadbeaf); > + * > * Test if a mapping is valid with either dma_buf_map_is_set() or > * dma_buf_map_is_null(). > * > @@ -118,6 +124,20 @@ static inline void dma_buf_map_set_vaddr(struct dma_buf_map *map, void *vaddr) > map->is_iomem = false; > } > > +/** > + * dma_buf_map_set_vaddr_iomem - Sets a dma-buf mapping structure to an address in I/O memory > + * @map: The dma-buf mapping structure > + * @vaddr_iomem: An I/O-memory address > + * > + * Sets the address and the I/O-memory flag. > + */ > +static inline void dma_buf_map_set_vaddr_iomem(struct dma_buf_map *map, > + void __iomem *vaddr_iomem) > +{ > + map->vaddr_iomem = vaddr_iomem; > + map->is_iomem = true; > +} > + > /** > * dma_buf_map_is_equal - Compares two dma-buf mapping structures for equality > * @lhs: The dma-buf mapping structure