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dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=amd-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id F1B226ED95; Thu, 15 Oct 2020 17:52:10 +0000 (UTC) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id D43B76ED91; Thu, 15 Oct 2020 17:52:08 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 367DEAFAE; Thu, 15 Oct 2020 17:52:07 +0000 (UTC) Date: Thu, 15 Oct 2020 19:52:04 +0200 From: Thomas Zimmermann To: Daniel Vetter Subject: Re: [PATCH v4 05/10] drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers Message-ID: <20201015195204.1745fe7f@linux-uq9g> In-Reply-To: <20201015164909.GC401619@phenom.ffwll.local> References: <20201015123806.32416-1-tzimmermann@suse.de> <20201015123806.32416-6-tzimmermann@suse.de> <935d5771-5645-62a6-849c-31e286db1e30@amd.com> <20201015164909.GC401619@phenom.ffwll.local> Organization: SUSE Software Solutions Germany GmbH X-Mailer: Claws Mail 3.17.7 (GTK+ 2.24.32; x86_64-suse-linux-gnu) MIME-Version: 1.0 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: airlied@linux.ie, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, melissa.srw@gmail.com, ray.huang@amd.com, kraxel@redhat.com, yuq825@gmail.com, sam@ravnborg.org, emil.velikov@collabora.com, 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, luben.tuikov@amd.com, bskeggs@redhat.com, linux+etnaviv@armlinux.org.uk, 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vmap/vunmap to TTM and TTM GEM helpers Message-ID: <20201015195204.1745fe7f@linux-uq9g> In-Reply-To: <20201015164909.GC401619@phenom.ffwll.local> References: <20201015123806.32416-1-tzimmermann@suse.de> <20201015123806.32416-6-tzimmermann@suse.de> <935d5771-5645-62a6-849c-31e286db1e30@amd.com> <20201015164909.GC401619@phenom.ffwll.local> Organization: SUSE Software Solutions Germany GmbH X-Mailer: Claws Mail 3.17.7 (GTK+ 2.24.32; x86_64-suse-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201015_135209_193113_1346A025 X-CRM114-Status: GOOD ( 48.11 ) 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: airlied@linux.ie, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, melissa.srw@gmail.com, 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[198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 503E8C433DF for ; Thu, 15 Oct 2020 17:52:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D13D922274 for ; Thu, 15 Oct 2020 17:52:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727119AbgJORwK convert rfc822-to-8bit (ORCPT ); Thu, 15 Oct 2020 13:52:10 -0400 Received: from mx2.suse.de ([195.135.220.15]:54374 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726112AbgJORwK (ORCPT ); Thu, 15 Oct 2020 13:52:10 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 367DEAFAE; Thu, 15 Oct 2020 17:52:07 +0000 (UTC) Date: Thu, 15 Oct 2020 19:52:04 +0200 From: Thomas Zimmermann To: Daniel Vetter Cc: Christian =?UTF-8?B?S8O2bmln?= , luben.tuikov@amd.com, airlied@linux.ie, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, melissa.srw@gmail.com, ray.huang@amd.com, kraxel@redhat.com, sam@ravnborg.org, emil.velikov@collabora.com, 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, spice-devel@lists.freedesktop.org, alyssa.rosenzweig@collabora.com, etnaviv@lists.freedesktop.org, hdegoede@redhat.com, xen-devel@lists.xenproject.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, alexander.deucher@amd.com, linux-media@vger.kernel.org Subject: Re: [PATCH v4 05/10] drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers Message-ID: <20201015195204.1745fe7f@linux-uq9g> In-Reply-To: <20201015164909.GC401619@phenom.ffwll.local> References: <20201015123806.32416-1-tzimmermann@suse.de> <20201015123806.32416-6-tzimmermann@suse.de> <935d5771-5645-62a6-849c-31e286db1e30@amd.com> <20201015164909.GC401619@phenom.ffwll.local> Organization: SUSE Software Solutions Germany GmbH X-Mailer: Claws Mail 3.17.7 (GTK+ 2.24.32; x86_64-suse-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Hi On Thu, 15 Oct 2020 18:49:09 +0200 Daniel Vetter wrote: > On Thu, Oct 15, 2020 at 04:08:13PM +0200, Christian König wrote: > > Am 15.10.20 um 14:38 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. > > > > > > v4: > > > * drop ttm_kmap_obj_to_dma_buf() in favor of vmap helpers > > > (Daniel, Christian) > > > > Bunch of minor comments below, but over all look very solid to me. > > Yeah I think just duplicating the ttm bo map stuff for vmap is indeed the > cleanest. And then we can maybe push the combinatorial monster into > vmwgfx, which I think is the only user after this series. Or perhaps a > dedicated set of helpers to map an invidual page (again using the > dma_buf_map stuff). >From a quick look, I'd say it should be possible to have the same interface for kmap/kunmap as for vmap/vunmap (i.e., parameters are bo and dma-buf-map). All mapping state can be deduced from this. And struct ttm_bo_kmap_obj can be killed off entirely. Best regards Thomas > > I'll let Christian with the details, but at a high level this is > definitely > > Acked-by: Daniel Vetter > > Thanks a lot for doing all this. > -Daniel > > > > > > > > > Signed-off-by: Thomas Zimmermann > > > --- > > > 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 bdee4df1f3f2..80c42c774c7d > > > 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 > > > @@ -526,6 +527,77 @@ 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; > > > + unsigned long size = bo->num_pages << PAGE_SHIFT; > > > > Please use uint64_t here and make sure to cast bo->num_pages before > > shifting. > > > > We have an unit tests of allocating a 8GB BO and that should work on a > > 32bit machine as well :) > > > > > + > > > + if (mem->bus.addr) > > > + vaddr_iomem = (void *)(((u8 *)mem->bus.addr)); > > > + 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. > > > > > + 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; > > > + > > > + BUG_ON(!ttm); > > > > I think we can drop this, populate will just crash badly anyway. > > > > > + > > > + 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(mem->placement, PAGE_KERNEL); > > > > The calling convention has changed on drm-misc-next as well, but should be > > trivial to adapt. > > > > Regards, > > Christian. > > > > > + 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) +{ > > > + if (dma_buf_map_is_null(map)) > > > + return; > > > + > > > + if (map->is_iomem) > > > + iounmap(map->vaddr_iomem); > > > + else > > > + vunmap(map->vaddr); > > > + 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 > > > -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Zimmermann Subject: Re: [PATCH v4 05/10] drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers Date: Thu, 15 Oct 2020 19:52:04 +0200 Message-ID: <20201015195204.1745fe7f@linux-uq9g> References: <20201015123806.32416-1-tzimmermann@suse.de> <20201015123806.32416-6-tzimmermann@suse.de> <935d5771-5645-62a6-849c-31e286db1e30@amd.com> <20201015164909.GC401619@phenom.ffwll.local> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Return-path: In-Reply-To: <20201015164909.GC401619@phenom.ffwll.local> To: Daniel Vetter Cc: Christian =?UTF-8?B?S8O2bmln?= , luben.tuikov@amd.com, airlied@linux.ie, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, melissa.srw@gmail.com, ray.huang@amd.com, kraxel@redhat.com, sam@ravnborg.org, emil.velikov@collabora.com, 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, spice-devel@lists.freedesktop.org, alyssa.rosenzweig@collabora.com, etnaviv@lists.freedesktop.org, hdegoede@redhat.com, xen-devel@lists.xenproject.org, virtualization@lists.linux-foundation.org, sean@poorly.run, apaneers@a List-Id: nouveau.vger.kernel.org Hi On Thu, 15 Oct 2020 18:49:09 +0200 Daniel Vetter wrote: > On Thu, Oct 15, 2020 at 04:08:13PM +0200, Christian König wrote: > > Am 15.10.20 um 14:38 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. > > > > > > v4: > > > * drop ttm_kmap_obj_to_dma_buf() in favor of vmap helpers > > > (Daniel, Christian) > > > > Bunch of minor comments below, but over all look very solid to me. > > Yeah I think just duplicating the ttm bo map stuff for vmap is indeed the > cleanest. And then we can maybe push the combinatorial monster into > vmwgfx, which I think is the only user after this series. Or perhaps a > dedicated set of helpers to map an invidual page (again using the > dma_buf_map stuff). >From a quick look, I'd say it should be possible to have the same interface for kmap/kunmap as for vmap/vunmap (i.e., parameters are bo and dma-buf-map). All mapping state can be deduced from this. And struct ttm_bo_kmap_obj can be killed off entirely. Best regards Thomas > > I'll let Christian with the details, but at a high level this is > definitely > > Acked-by: Daniel Vetter > > Thanks a lot for doing all this. > -Daniel > > > > > > > > > Signed-off-by: Thomas Zimmermann > > > --- > > > 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 bdee4df1f3f2..80c42c774c7d > > > 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 > > > @@ -526,6 +527,77 @@ 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; > > > + unsigned long size = bo->num_pages << PAGE_SHIFT; > > > > Please use uint64_t here and make sure to cast bo->num_pages before > > shifting. > > > > We have an unit tests of allocating a 8GB BO and that should work on a > > 32bit machine as well :) > > > > > + > > > + if (mem->bus.addr) > > > + vaddr_iomem = (void *)(((u8 *)mem->bus.addr)); > > > + 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. > > > > > + 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; > > > + > > > + BUG_ON(!ttm); > > > > I think we can drop this, populate will just crash badly anyway. > > > > > + > > > + 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(mem->placement, PAGE_KERNEL); > > > > The calling convention has changed on drm-misc-next as well, but should be > > trivial to adapt. > > > > Regards, > > Christian. > > > > > + 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) +{ > > > + if (dma_buf_map_is_null(map)) > > > + return; > > > + > > > + if (map->is_iomem) > > > + iounmap(map->vaddr_iomem); > > > + else > > > + vunmap(map->vaddr); > > > + 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 > > > -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B99BC433E7 for ; Thu, 15 Oct 2020 17:52:16 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 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Thu, 15 Oct 2020 19:52:04 +0200 From: Thomas Zimmermann To: Daniel Vetter Subject: Re: [PATCH v4 05/10] drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers Message-ID: <20201015195204.1745fe7f@linux-uq9g> In-Reply-To: <20201015164909.GC401619@phenom.ffwll.local> References: <20201015123806.32416-1-tzimmermann@suse.de> <20201015123806.32416-6-tzimmermann@suse.de> <935d5771-5645-62a6-849c-31e286db1e30@amd.com> <20201015164909.GC401619@phenom.ffwll.local> Organization: SUSE Software Solutions Germany GmbH X-Mailer: Claws Mail 3.17.7 (GTK+ 2.24.32; x86_64-suse-linux-gnu) MIME-Version: 1.0 Cc: airlied@linux.ie, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, melissa.srw@gmail.com, ray.huang@amd.com, yuq825@gmail.com, sam@ravnborg.org, emil.velikov@collabora.com, 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, 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smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A2AB16ED92; Thu, 15 Oct 2020 17:52:10 +0000 (UTC) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id D43B76ED91; Thu, 15 Oct 2020 17:52:08 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 367DEAFAE; Thu, 15 Oct 2020 17:52:07 +0000 (UTC) Date: Thu, 15 Oct 2020 19:52:04 +0200 From: Thomas Zimmermann To: Daniel Vetter Subject: Re: [PATCH v4 05/10] drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers Message-ID: <20201015195204.1745fe7f@linux-uq9g> In-Reply-To: <20201015164909.GC401619@phenom.ffwll.local> References: <20201015123806.32416-1-tzimmermann@suse.de> <20201015123806.32416-6-tzimmermann@suse.de> <935d5771-5645-62a6-849c-31e286db1e30@amd.com> <20201015164909.GC401619@phenom.ffwll.local> Organization: SUSE Software Solutions Germany GmbH X-Mailer: Claws Mail 3.17.7 (GTK+ 2.24.32; x86_64-suse-linux-gnu) MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: airlied@linux.ie, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, melissa.srw@gmail.com, ray.huang@amd.com, kraxel@redhat.com, yuq825@gmail.com, sam@ravnborg.org, emil.velikov@collabora.com, 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, luben.tuikov@amd.com, bskeggs@redhat.com, linux+etnaviv@armlinux.org.uk, spice-devel@lists.freedesktop.org, alyssa.rosenzweig@collabora.com, 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