diff options
| author | Dave Airlie <airlied@redhat.com> | 2012-05-18 15:40:33 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-05-23 10:45:57 +0100 |
| commit | 51ab7ba2673758561074184795bba5bac780a038 (patch) | |
| tree | 698c399d22524b5ec018af82c89d6c5c8ff422a3 /drivers/gpu/drm/drm_prime.c | |
| parent | 4d93914ae3db4a897ead4b1e33eca7cdfff4c6f7 (diff) | |
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>
Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 1bdf2b54eaf6..20dbf2c45385 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -227,6 +227,42 @@ out: } EXPORT_SYMBOL(drm_prime_pages_to_sg); +/* export an sg table into an array of pages and addresses + this is currently required by the TTM driver in order to do correct fault + handling */ +int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, + dma_addr_t *addrs, int max_pages) +{ + unsigned count; + struct scatterlist *sg; + struct page *page; + u32 len, offset; + int pg_index; + dma_addr_t addr; + + pg_index = 0; + for_each_sg(sgt->sgl, sg, sgt->nents, count) { + len = sg->length; + offset = sg->offset; + page = sg_page(sg); + addr = sg_dma_address(sg); + + while (len > 0) { + if (WARN_ON(pg_index >= max_pages)) + return -1; + pages[pg_index] = page; + if (addrs) + addrs[pg_index] = addr; + + page++; + addr += PAGE_SIZE; + len -= PAGE_SIZE; + pg_index++; + } + } + return 0; +} +EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); /* helper function to cleanup a GEM/prime object */ void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) { |