From 9da3da660d8c19a54f6e93361d147509be3fff84 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 1 Jun 2012 15:20:22 +0100 Subject: drm/i915: Replace the array of pages with a scatterlist Rather than have multiple data structures for describing our page layout in conjunction with the array of pages, we can migrate all users over to a scatterlist. One major advantage, other than unifying the page tracking structures, this offers is that we replace the vmalloc'ed array (which can be up to a megabyte in size) with a chain of individual pages which helps reduce memory pressure. The disadvantage is that we then do not have a simple array to iterate, or to access randomly. The common case for this is in the relocation processing, which will typically fit within a single scatterlist page and so be almost the same cost as the simple array. For iterating over the array, the extra function call could be optimised away, but in reality is an insignificant cost of either binding the pages, or performing the pwrite/pread. v2: Fix drm_clflush_sg() to not invoke wbinvd as well! And fix the trivial compile error from rebasing. Signed-off-by: Chris Wilson Signed-off-by: Daniel Vetter --- drivers/gpu/drm/drm_cache.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/gpu/drm/drm_cache.c') diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index 3dbc7f1..4a4274b3 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -101,6 +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) -- cgit v1.1