From: Thierry Reding treding@nvidia.com
Add implementations for drm_clflush_*() on ARM by borrowing code from the DMA mapping API implementation. Unfortunately ARM doesn't export an API to flush caches on a page by page basis, so this replicates most of the code.
Signed-off-by: Thierry Reding treding@nvidia.com --- drivers/gpu/drm/drm_cache.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+)
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index a6b690626a6b..fca0b8994c77 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -72,6 +72,41 @@ drm_clflush_ipi_handler(void *null) } #endif
+#if defined(CONFIG_ARM) + +#include <asm/cacheflush.h> +#include <asm/cachetype.h> +#include <asm/highmem.h> +#include <asm/outercache.h> + +static void drm_clflush_page(struct page *page) +{ + enum dma_data_direction dir = DMA_TO_DEVICE; + phys_addr_t phys = page_to_phys(page); + size_t size = PAGE_SIZE; + void *virt; + + if (PageHighMem(page)) { + if (cache_is_vipt_nonaliasing()) { + virt = kmap_atomic(page); + dmac_map_area(virt, size, dir); + kunmap_atomic(virt); + } else { + virt = kmap_high_get(page); + if (virt) { + dmac_map_area(virt, size, dir); + kunmap_high(page); + } + } + } else { + virt = page_address(page); + dmac_map_area(virt, size, dir); + } + + outer_flush_range(phys, phys + PAGE_SIZE); +} +#endif + void drm_clflush_pages(struct page *pages[], unsigned long num_pages) { @@ -99,6 +134,11 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages) (unsigned long)page_virtual + PAGE_SIZE); kunmap_atomic(page_virtual); } +#elif defined(CONFIG_ARM) + unsigned long i; + + for (i = 0; i < num_pages; i++) + drm_clflush_page(pages[i]); #else printk(KERN_ERR "Architecture has no drm_cache.c support\n"); WARN_ON_ONCE(1); @@ -123,6 +163,11 @@ drm_clflush_sg(struct sg_table *st)
if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) printk(KERN_ERR "Timed out waiting for cache flush.\n"); +#elif defined(CONFIG_ARM) + struct sg_page_iter sg_iter; + + for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) + drm_clflush_page(sg_page_iter_page(&sg_iter)); #else printk(KERN_ERR "Architecture has no drm_cache.c support\n"); WARN_ON_ONCE(1);