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drm/prime: introduce sg->pages/addr arrays helper
the ttm drivers need this currently, in order to get fault handling working and efficient. It also allows addrs to be NULL for devices like udl. Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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2 changed files with 38 additions and 0 deletions
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@ -227,6 +227,42 @@ struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages)
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}
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EXPORT_SYMBOL(drm_prime_pages_to_sg);
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/* export an sg table into an array of pages and addresses
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this is currently required by the TTM driver in order to do correct fault
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handling */
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int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
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dma_addr_t *addrs, int max_pages)
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{
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unsigned count;
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struct scatterlist *sg;
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struct page *page;
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u32 len, offset;
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int pg_index;
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dma_addr_t addr;
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pg_index = 0;
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for_each_sg(sgt->sgl, sg, sgt->nents, count) {
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len = sg->length;
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offset = sg->offset;
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page = sg_page(sg);
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addr = sg_dma_address(sg);
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while (len > 0) {
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if (WARN_ON(pg_index >= max_pages))
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return -1;
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pages[pg_index] = page;
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if (addrs)
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addrs[pg_index] = addr;
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page++;
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addr += PAGE_SIZE;
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len -= PAGE_SIZE;
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pg_index++;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays);
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/* helper function to cleanup a GEM/prime object */
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void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg)
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{
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@ -1558,6 +1558,8 @@ extern int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
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extern int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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extern int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
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dma_addr_t *addrs, int max_pages);
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extern struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages);
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extern void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg);
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