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charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Operating-System: Linux phenom 5.7.0-1-amd64 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On Wed, Sep 30, 2020 at 10:34:31AM +0200, Christian König wrote: > Am 30.09.20 um 10:19 schrieb Thomas Zimmermann: > > Hi > > > > Am 30.09.20 um 10:05 schrieb Christian König: > > > Am 29.09.20 um 19:49 schrieb Thomas Zimmermann: > > > > Hi Christian > > > > > > > > Am 29.09.20 um 17:35 schrieb Christian König: > > > > > Am 29.09.20 um 17:14 schrieb Thomas Zimmermann: > > > > > > The new helper ttm_kmap_obj_to_dma_buf() extracts address and location > > > > > > from and instance of TTM's kmap_obj and initializes struct dma_buf_map > > > > > > with these values. Helpful for TTM-based drivers. > > > > > We could completely drop that if we use the same structure inside TTM as > > > > > well. > > > > > > > > > > Additional to that which driver is going to use this? > > > > As Daniel mentioned, it's in patch 3. The TTM-based drivers will > > > > retrieve the pointer via this function. > > > > > > > > I do want to see all that being more tightly integrated into TTM, but > > > > not in this series. This one is about fixing the bochs-on-sparc64 > > > > problem for good. Patch 7 adds an update to TTM to the DRM TODO list. > > > I should have asked which driver you try to fix here :) > > > > > > In this case just keep the function inside bochs and only fix it there. > > > > > > All other drivers can be fixed when we generally pump this through TTM. > > Did you take a look at patch 3? This function will be used by VRAM > > helpers, nouveau, radeon, amdgpu and qxl. If we don't put it here, we > > have to duplicate the functionality in each if these drivers. Bochs > > itself uses VRAM helpers and doesn't touch the function directly. > > Ah, ok can we have that then only in the VRAM helpers? > > Alternative you could go ahead and use dma_buf_map in ttm_bo_kmap_obj > directly and drop the hack with the TTM_BO_MAP_IOMEM_MASK. > > What I want to avoid is to have another conversion function in TTM because > what happens here is that we already convert from ttm_bus_placement to > ttm_bo_kmap_obj and then to dma_buf_map. Hm I'm not really seeing how that helps with a gradual conversion of everything over to dma_buf_map and assorted helpers for access? There's too many places in ttm drivers where is_iomem and related stuff is used to be able to convert it all in one go. An intermediate state with a bunch of conversions seems fairly unavoidable to me. -Daniel > > Thanks, > Christian. > > > > > Best regards > > Thomas > > > > > Regards, > > > Christian. > > > > > > > Best regards > > > > Thomas > > > > > > > > > Regards, > > > > > Christian. > > > > > > > > > > > Signed-off-by: Thomas Zimmermann > > > > > > --- > > > > > >   include/drm/ttm/ttm_bo_api.h | 24 ++++++++++++++++++++++++ > > > > > >   include/linux/dma-buf-map.h  | 20 ++++++++++++++++++++ > > > > > >   2 files changed, 44 insertions(+) > > > > > > > > > > > > diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h > > > > > > index c96a25d571c8..62d89f05a801 100644 > > > > > > --- a/include/drm/ttm/ttm_bo_api.h > > > > > > +++ b/include/drm/ttm/ttm_bo_api.h > > > > > > @@ -34,6 +34,7 @@ > > > > > >   #include > > > > > >   #include > > > > > >   #include > > > > > > +#include > > > > > >   #include > > > > > >   #include > > > > > >   #include > > > > > > @@ -486,6 +487,29 @@ static inline void *ttm_kmap_obj_virtual(struct > > > > > > ttm_bo_kmap_obj *map, > > > > > >       return map->virtual; > > > > > >   } > > > > > >   +/** > > > > > > + * ttm_kmap_obj_to_dma_buf_map > > > > > > + * > > > > > > + * @kmap: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap. > > > > > > + * @map: Returns the mapping as struct dma_buf_map > > > > > > + * > > > > > > + * Converts struct ttm_bo_kmap_obj to struct dma_buf_map. If the memory > > > > > > + * is not mapped, the returned mapping is initialized to NULL. > > > > > > + */ > > > > > > +static inline void ttm_kmap_obj_to_dma_buf_map(struct ttm_bo_kmap_obj > > > > > > *kmap, > > > > > > +                           struct dma_buf_map *map) > > > > > > +{ > > > > > > +    bool is_iomem; > > > > > > +    void *vaddr = ttm_kmap_obj_virtual(kmap, &is_iomem); > > > > > > + > > > > > > +    if (!vaddr) > > > > > > +        dma_buf_map_clear(map); > > > > > > +    else if (is_iomem) > > > > > > +        dma_buf_map_set_vaddr_iomem(map, (void __force __iomem *)vaddr); > > > > > > +    else > > > > > > +        dma_buf_map_set_vaddr(map, vaddr); > > > > > > +} > > > > > > + > > > > > >   /** > > > > > >    * ttm_bo_kmap > > > > > >    * > > > > > > 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 > > > > > _______________________________________________ > > > > > dri-devel mailing list > > > > > dri-devel@lists.freedesktop.org > > > > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > > > > _______________________________________________ > > > > amd-gfx mailing list > > > > amd-gfx@lists.freedesktop.org > > > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx > > > > > > _______________________________________________ > > > dri-devel mailing list > > > dri-devel@lists.freedesktop.org > > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > > > > > > > _______________________________________________ > > amd-gfx mailing list > > amd-gfx@lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch