diff options
Diffstat (limited to 'drivers/gpu/drm/drm_cache.c')
| -rw-r--r-- | drivers/gpu/drm/drm_cache.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index ec4698246213..a575cb2e6bdb 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -37,12 +37,13 @@ drm_clflush_page(struct page *page) { uint8_t *page_virtual; unsigned int i; + const int size = boot_cpu_data.x86_clflush_size; if (unlikely(page == NULL)) return; page_virtual = kmap_atomic(page); - for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) + for (i = 0; i < PAGE_SIZE; i += size) clflush(page_virtual + i); kunmap_atomic(page_virtual); } @@ -100,6 +101,31 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages) EXPORT_SYMBOL(drm_clflush_pages); void +drm_clflush_sg(struct sg_table *st) +{ +#if defined(CONFIG_X86) + if (cpu_has_clflush) { + struct scatterlist *sg; + int i; + + mb(); + for_each_sg(st->sgl, sg, st->nents, i) + drm_clflush_page(sg_page(sg)); + mb(); + + return; + } + + if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) + printk(KERN_ERR "Timed out waiting for cache flush.\n"); +#else + printk(KERN_ERR "Architecture has no drm_cache.c support\n"); + WARN_ON_ONCE(1); +#endif +} +EXPORT_SYMBOL(drm_clflush_sg); + +void drm_clflush_virt_range(char *addr, unsigned long length) { #if defined(CONFIG_X86) |