On Sun, Nov 06, 2011 at 08:13:53PM +0100, Daniel Vetter wrote:
Useful when the page is already mapped to copy date in/out.
Cc: dri-devel@lists.freedesktop.org Signed-off-by: Daniel Vetter daniel.vetter@ffwll.ch
drivers/gpu/drm/drm_cache.c | 23 +++++++++++++++++++++++ include/drm/drmP.h | 1 + 2 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index 0e3bd5b..502771a 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -97,3 +97,26 @@ 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);
I'd feel more comfortable with a BUG_ON(irqs_disabled()); before the IPI... though I don't even know how many platforms that actually pertains to (if any).