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Mon, 19 Oct 2020 08:46:45 -0700 (PDT) Date: Mon, 19 Oct 2020 17:46:42 +0200 From: Daniel Vetter To: Christian =?iso-8859-1?Q?K=F6nig?= Subject: Re: [PATCH v4 05/10] drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers Message-ID: <20201019154642.GF401619@phenom.ffwll.local> References: <20201015123806.32416-1-tzimmermann@suse.de> <20201015123806.32416-6-tzimmermann@suse.de> <935d5771-5645-62a6-849c-31e286db1e30@amd.com> <87c7c342-88dc-9a36-31f7-dae6edd34626@suse.de> <9236f51c-c1fa-dadc-c7cc-d9d0c09251d1@amd.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <9236f51c-c1fa-dadc-c7cc-d9d0c09251d1@amd.com> X-Operating-System: Linux phenom 5.7.0-1-amd64 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201019_114649_413185_7F97802F X-CRM114-Status: GOOD ( 43.62 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: luben.tuikov@amd.com, heiko@sntech.de, airlied@linux.ie, nouveau@lists.freedesktop.org, linus.walleij@linaro.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, melissa.srw@gmail.com, eric@anholt.net, ray.huang@amd.com, kraxel@redhat.com, sam@ravnborg.org, sumit.semwal@linaro.org, emil.velikov@collabora.com, robh@kernel.org, linux-samsung-soc@vger.kernel.org, jy0922.shim@samsung.com, lima@lists.freedesktop.org, oleksandr_andrushchenko@epam.com, krzk@kernel.org, steven.price@arm.com, linux-rockchip@lists.infradead.org, kgene@kernel.org, bskeggs@redhat.com, linux+etnaviv@armlinux.org.uk, xen-devel@lists.xenproject.org, alyssa.rosenzweig@collabora.com, daniel@ffwll.ch, maarten.lankhorst@linux.intel.com, etnaviv@lists.freedesktop.org, mripard@kernel.org, inki.dae@samsung.com, hdegoede@redhat.com, christian.gmeiner@gmail.com, spice-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, sean@poorly.run, apaneers@amd.com, linux-arm-kernel@lists.infradead.org, linaro-mm-sig@lists.linaro.org, amd-gfx@lists.freedesktop.org, tomeu.vizoso@collabora.com, sw0312.kim@samsung.com, hjc@rock-chips.com, kyungmin.park@samsung.com, miaoqinglang@huawei.com, yuq825@gmail.com, Thomas Zimmermann , alexander.deucher@amd.com, linux-media@vger.kernel.org, l.stach@pengutronix.de Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org On Mon, Oct 19, 2020 at 11:45:05AM +0200, Christian K=F6nig wrote: > Hi Thomas, > = > [SNIP] > > > > =A0 +int ttm_bo_vmap(struct ttm_buffer_object *bo, struct dma_buf_= map *map) > > > > +{ > > > > +=A0=A0=A0 struct ttm_resource *mem =3D &bo->mem; > > > > +=A0=A0=A0 int ret; > > > > + > > > > +=A0=A0=A0 ret =3D ttm_mem_io_reserve(bo->bdev, mem); > > > > +=A0=A0=A0 if (ret) > > > > +=A0=A0=A0=A0=A0=A0=A0 return ret; > > > > + > > > > +=A0=A0=A0 if (mem->bus.is_iomem) { > > > > +=A0=A0=A0=A0=A0=A0=A0 void __iomem *vaddr_iomem; > > > > +=A0=A0=A0=A0=A0=A0=A0 unsigned long size =3D bo->num_pages << PAGE= _SHIFT; > > > Please use uint64_t here and make sure to cast bo->num_pages before > > > shifting. > > I thought the rule of thumb is to use u64 in source code. Yet TTM only > > uses uint*_t types. Is there anything special about TTM? > = > My last status is that you can use both and my personal preference is to = use > the uint*_t types because they are part of a higher level standard. Yeah the only hard rule is that in uapi headers you need to use the __u64 and similar typedefs, to avoid cluttering the namespace for unrelated stuff in userspace. In the kernel c99 types are perfectly fine, and I think slowly on the rise. -Daniel > = > > > We have an unit tests of allocating a 8GB BO and that should work on a > > > 32bit machine as well :) > > > = > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0 if (mem->bus.addr) > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 vaddr_iomem =3D (void *)(((u8 *)= mem->bus.addr)); > > I after reading the patch again, I realized that this is the > > 'ttm_bo_map_premapped' case and it's missing from _vunmap(). I see two > > options here: ignore this case in _vunmap(), or do an ioremap() > > unconditionally. Which one is preferable? > = > ioremap would be very very bad, so we should just do nothing. > = > Thanks, > Christian. > = > > = > > Best regards > > Thomas > > = > > > > +=A0=A0=A0=A0=A0=A0=A0 else if (mem->placement & TTM_PL_FLAG_WC) > > > I've just nuked the TTM_PL_FLAG_WC flag in drm-misc-next. There is a = new > > > mem->bus.caching enum as replacement. > > > = > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 vaddr_iomem =3D ioremap_wc(mem->= bus.offset, size); > > > > +=A0=A0=A0=A0=A0=A0=A0 else > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 vaddr_iomem =3D ioremap(mem->bus= .offset, size); > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0 if (!vaddr_iomem) > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 return -ENOMEM; > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0 dma_buf_map_set_vaddr_iomem(map, vaddr_iomem= ); > > > > + > > > > +=A0=A0=A0 } else { > > > > +=A0=A0=A0=A0=A0=A0=A0 struct ttm_operation_ctx ctx =3D { > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 .interruptible =3D false, > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 .no_wait_gpu =3D false > > > > +=A0=A0=A0=A0=A0=A0=A0 }; > > > > +=A0=A0=A0=A0=A0=A0=A0 struct ttm_tt *ttm =3D bo->ttm; > > > > +=A0=A0=A0=A0=A0=A0=A0 pgprot_t prot; > > > > +=A0=A0=A0=A0=A0=A0=A0 void *vaddr; > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0 BUG_ON(!ttm); > > > I think we can drop this, populate will just crash badly anyway. > > > = > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0 ret =3D ttm_tt_populate(bo->bdev, ttm, &ctx); > > > > +=A0=A0=A0=A0=A0=A0=A0 if (ret) > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 return ret; > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0 /* > > > > +=A0=A0=A0=A0=A0=A0=A0=A0 * We need to use vmap to get the desired = page protection > > > > +=A0=A0=A0=A0=A0=A0=A0=A0 * or to make the buffer object look conti= guous. > > > > +=A0=A0=A0=A0=A0=A0=A0=A0 */ > > > > +=A0=A0=A0=A0=A0=A0=A0 prot =3D ttm_io_prot(mem->placement, PAGE_KE= RNEL); > > > The calling convention has changed on drm-misc-next as well, but shou= ld > > > be trivial to adapt. > > > = > > > Regards, > > > Christian. > > > = > > > > +=A0=A0=A0=A0=A0=A0=A0 vaddr =3D vmap(ttm->pages, bo->num_pages, 0,= prot); > > > > +=A0=A0=A0=A0=A0=A0=A0 if (!vaddr) > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 return -ENOMEM; > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0 dma_buf_map_set_vaddr(map, vaddr); > > > > +=A0=A0=A0 } > > > > + > > > > +=A0=A0=A0 return 0; > > > > +} > > > > +EXPORT_SYMBOL(ttm_bo_vmap); > > > > + > > > > +void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct dma_buf_map > > > > *map) > > > > +{ > > > > +=A0=A0=A0 if (dma_buf_map_is_null(map)) > > > > +=A0=A0=A0=A0=A0=A0=A0 return; > > > > + > > > > +=A0=A0=A0 if (map->is_iomem) > > > > +=A0=A0=A0=A0=A0=A0=A0 iounmap(map->vaddr_iomem); > > > > +=A0=A0=A0 else > > > > +=A0=A0=A0=A0=A0=A0=A0 vunmap(map->vaddr); > > > > +=A0=A0=A0 dma_buf_map_clear(map); > > > > + > > > > +=A0=A0=A0 ttm_mem_io_free(bo->bdev, &bo->mem); > > > > +} > > > > +EXPORT_SYMBOL(ttm_bo_vunmap); > > > > + > > > > =A0 static int ttm_bo_wait_free_node(struct ttm_buffer_object *bo, > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 bool dst_us= e_tt) > > > > =A0 { > > > > 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 @@ > > > > =A0 #include > > > > =A0 #include > > > > =A0 +struct dma_buf_map; > > > > + > > > > =A0 #define drm_gem_ttm_of_gem(gem_obj) \ > > > > =A0=A0=A0=A0=A0 container_of(gem_obj, struct ttm_buffer_object, ba= se) > > > > =A0 =A0 void drm_gem_ttm_print_info(struct drm_printer *p, unsigne= d int > > > > indent, > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 const struct d= rm_gem_object *gem); > > > > +int drm_gem_ttm_vmap(struct drm_gem_object *gem, > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 struct dma_buf_map *map); > > > > +void drm_gem_ttm_vunmap(struct drm_gem_object *gem, > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 struct dma_buf_map *map); > > > > =A0 int drm_gem_ttm_mmap(struct drm_gem_object *gem, > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 struct vm_area_struct *= vma); > > > > =A0 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; > > > > =A0 =A0 struct ttm_bo_device; > > > > =A0 +struct dma_buf_map; > > > > + > > > > =A0 struct drm_mm_node; > > > > =A0 =A0 struct ttm_placement; > > > > @@ -494,6 +496,32 @@ int ttm_bo_kmap(struct ttm_buffer_object *bo, > > > > unsigned long start_page, > > > > =A0=A0 */ > > > > =A0 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map); > > > > =A0 +/** > > > > + * 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 virtu= al > > > > + * address as struct dma_buf_map. Unmap the buffer with ttm_bo_vun= map(). > > > > + * > > > > + * 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); > > > > + > > > > =A0 /** > > > > =A0=A0 * ttm_bo_mmap_obj - mmap memory backed by a ttm buffer obje= ct. > > > > =A0=A0 * > > > > diff --git a/include/linux/dma-buf-map.h b/include/linux/dma-buf-ma= p.h > > > > index fd1aba545fdf..2e8bbecb5091 100644 > > > > --- a/include/linux/dma-buf-map.h > > > > +++ b/include/linux/dma-buf-map.h > > > > @@ -45,6 +45,12 @@ > > > > =A0=A0 * > > > > =A0=A0 *=A0=A0=A0 dma_buf_map_set_vaddr(&map. 0xdeadbeaf); > > > > =A0=A0 * > > > > + * To set an address in I/O memory, use dma_buf_map_set_vaddr_iome= m(). > > > > + * > > > > + * .. code-block:: c > > > > + * > > > > + *=A0=A0=A0 dma_buf_map_set_vaddr_iomem(&map. 0xdeadbeaf); > > > > + * > > > > =A0=A0 * Test if a mapping is valid with either dma_buf_map_is_set= () or > > > > =A0=A0 * dma_buf_map_is_null(). > > > > =A0=A0 * > > > > @@ -118,6 +124,20 @@ static inline void dma_buf_map_set_vaddr(struct > > > > dma_buf_map *map, void *vaddr) > > > > =A0=A0=A0=A0=A0 map->is_iomem =3D false; > > > > =A0 } > > > > =A0 +/** > > > > + * dma_buf_map_set_vaddr_iomem - Sets a dma-buf mapping structure = to > > > > an address in I/O memory > > > > + * @map:=A0=A0=A0=A0=A0=A0=A0 The dma-buf mapping structure > > > > + * @vaddr_iomem:=A0=A0=A0 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, > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0 void __iomem *vaddr_iomem) > > > > +{ > > > > +=A0=A0=A0 map->vaddr_iomem =3D vaddr_iomem; > > > > +=A0=A0=A0 map->is_iomem =3D true; > > > > +} > > > > + > > > > =A0 /** > > > > =A0=A0 * dma_buf_map_is_equal - Compares two dma-buf mapping struc= tures > > > > for equality > > > > =A0=A0 * @lhs:=A0=A0=A0 The dma-buf mapping structure > > > _______________________________________________ > > > dri-devel mailing list > > > dri-devel@lists.freedesktop.org > > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fl= ists.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&data=3D04%7C01%7C= christian.koenig%40amd.com%7C07bc68af3c6440b5be8d08d8740e9b32%7C3dd8961fe48= 84e608e11a82d994e183d%7C0%7C0%7C637386953433558595%7CUnknown%7CTWFpbGZsb3d8= eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&a= mp;sdata=3DRlGCmjzyZERvqfnl4kA1bEHez5bkLf3F9OlKi2ybDAM%3D&reserved=3D0 > = -- = Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip