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authorDaniel Vetter <daniel.vetter@ffwll.ch>2012-03-25 21:47:30 +0400
committerDaniel Vetter <daniel.vetter@ffwll.ch>2012-03-27 15:19:45 +0400
commit6d5cd9cb1e32e4f4e4468704430b26bcb0bfb129 (patch)
tree8dbb4943c5bafc999421d395d8a1f656bbb35ca0 /drivers/gpu/drm/drm_cache.c
parentdbf7bff074d5fdc87c61b1b41d8e809109cf0bf8 (diff)
downloadlinux-6d5cd9cb1e32e4f4e4468704430b26bcb0bfb129.tar.xz
drm: add helper to clflush a virtual address range
Useful when the page is already mapped to copy date in/out. For -stable because the next patch (fixing phys obj pwrite) needs this little helper function. Tested-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: dri-devel@lists.freedesktop.org Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_cache.c')
-rw-r--r--drivers/gpu/drm/drm_cache.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 592865381c6e..c7c8f6b5786f 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -98,3 +98,26 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages)
#endif
}
EXPORT_SYMBOL(drm_clflush_pages);
+
+void
+drm_clflush_virt_range(char *addr, unsigned long length)
+{
+#if defined(CONFIG_X86)
+ if (cpu_has_clflush) {
+ char *end = addr + length;
+ mb();
+ for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
+ clflush(addr);
+ clflush(end - 1);
+ 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_virt_range);