| Message ID | 20201015123806.32416-6-tzimmermann@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Support GEM object mappings from I/O memory | expand |
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. > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > --- > 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 <drm/ttm/ttm_bo_driver.h> > #include <drm/ttm/ttm_placement.h> > #include <drm/drm_vma_manager.h> > +#include <linux/dma-buf-map.h> > #include <linux/io.h> > #include <linux/highmem.h> > #include <linux/wait.h> > @@ -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 <drm/ttm/ttm_bo_api.h> > #include <drm/ttm/ttm_bo_driver.h> > > +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
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). I'll let Christian with the details, but at a high level this is definitely Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Thanks a lot for doing all this. -Daniel > > > > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > > --- > > 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 <drm/ttm/ttm_bo_driver.h> > > #include <drm/ttm/ttm_placement.h> > > #include <drm/drm_vma_manager.h> > > +#include <linux/dma-buf-map.h> > > #include <linux/io.h> > > #include <linux/highmem.h> > > #include <linux/wait.h> > > @@ -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 <drm/ttm/ttm_bo_api.h> > > #include <drm/ttm/ttm_bo_driver.h> > > +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 >
Hi On Thu, 15 Oct 2020 18:49:09 +0200 Daniel Vetter <daniel@ffwll.ch> 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 <daniel.vetter@ffwll.ch> > > Thanks a lot for doing all this. > -Daniel > > > > > > > > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > > > --- > > > 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 <drm/ttm/ttm_bo_driver.h> > > > #include <drm/ttm/ttm_placement.h> > > > #include <drm/drm_vma_manager.h> > > > +#include <linux/dma-buf-map.h> > > > #include <linux/io.h> > > > #include <linux/highmem.h> > > > #include <linux/wait.h> > > > @@ -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 <drm/ttm/ttm_bo_api.h> > > > #include <drm/ttm/ttm_bo_driver.h> > > > +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 > > >
Hi On Thu, 15 Oct 2020 16:08:13 +0200 Christian König <christian.koenig@amd.com> 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. > > > > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > > --- > > 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 <drm/ttm/ttm_bo_driver.h> > > #include <drm/ttm/ttm_placement.h> > > #include <drm/drm_vma_manager.h> > > +#include <linux/dma-buf-map.h> > > #include <linux/io.h> > > #include <linux/highmem.h> > > #include <linux/wait.h> > > @@ -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. Thanks for quickly reviewing these patches. My drm-tip seems out of date (last Sunday). TTM is moving fast these days and I still have to get used to that. :) Best regards Thomas > > 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 <drm/ttm/ttm_bo_api.h> > > #include <drm/ttm/ttm_bo_driver.h> > > > > +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 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
Am 15.10.20 um 19:52 schrieb Thomas Zimmermann: > Hi > > On Thu, 15 Oct 2020 18:49:09 +0200 Daniel Vetter <daniel@ffwll.ch> 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. Yes, that would be rather nice to have. Thanks, Christian. > > Best regards > Thomas > >> I'll let Christian with the details, but at a high level this is >> definitely >> >> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> >> >> Thanks a lot for doing all this. >> -Daniel >> >>>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> >>>> --- >>>> 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 <drm/ttm/ttm_bo_driver.h> >>>> #include <drm/ttm/ttm_placement.h> >>>> #include <drm/drm_vma_manager.h> >>>> +#include <linux/dma-buf-map.h> >>>> #include <linux/io.h> >>>> #include <linux/highmem.h> >>>> #include <linux/wait.h> >>>> @@ -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 <drm/ttm/ttm_bo_api.h> >>>> #include <drm/ttm/ttm_bo_driver.h> >>>> +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 > >
Hi Christian On 15.10.20 16:08, 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. > >> >> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> >> --- >> 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 <drm/ttm/ttm_bo_driver.h> >> #include <drm/ttm/ttm_placement.h> >> #include <drm/drm_vma_manager.h> >> +#include <linux/dma-buf-map.h> >> #include <linux/io.h> >> #include <linux/highmem.h> >> #include <linux/wait.h> >> @@ -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. 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? > > 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)); 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? Best regards Thomas >> + 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 <drm/ttm/ttm_bo_api.h> >> #include <drm/ttm/ttm_bo_driver.h> >> +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 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
Hi Thomas, [SNIP] >>> +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. > 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. >> 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)); > 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 > >>> + 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 <drm/ttm/ttm_bo_api.h> >>> #include <drm/ttm/ttm_bo_driver.h> >>> +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 >> _______________________________________________ >> dri-devel mailing list >> dri-devel@lists.freedesktop.org >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&data=04%7C01%7Cchristian.koenig%40amd.com%7C07bc68af3c6440b5be8d08d8740e9b32%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637386953433558595%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=RlGCmjzyZERvqfnl4kA1bEHez5bkLf3F9OlKi2ybDAM%3D&reserved=0
On Mon, Oct 19, 2020 at 11:45:05AM +0200, Christian König wrote: > Hi Thomas, > > [SNIP] > > > > +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. > > 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 :) > > > > > > > + > > > > + if (mem->bus.addr) > > > > + vaddr_iomem = (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 > > > > > > + 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 <drm/ttm/ttm_bo_api.h> > > > > #include <drm/ttm/ttm_bo_driver.h> > > > > +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 > > > _______________________________________________ > > > dri-devel mailing list > > > dri-devel@lists.freedesktop.org > > > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&data=04%7C01%7Cchristian.koenig%40amd.com%7C07bc68af3c6440b5be8d08d8740e9b32%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637386953433558595%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=RlGCmjzyZERvqfnl4kA1bEHez5bkLf3F9OlKi2ybDAM%3D&reserved=0 >
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 <drm/ttm/ttm_bo_driver.h> #include <drm/ttm/ttm_placement.h> #include <drm/drm_vma_manager.h> +#include <linux/dma-buf-map.h> #include <linux/io.h> #include <linux/highmem.h> #include <linux/wait.h> @@ -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; + + if (mem->bus.addr) + vaddr_iomem = (void *)(((u8 *)mem->bus.addr)); + else if (mem->placement & TTM_PL_FLAG_WC) + 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); + + 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); + 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 <drm/ttm/ttm_bo_api.h> #include <drm/ttm/ttm_bo_driver.h> +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
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) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> --- 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(+)