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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-03-25 21:47:30 +0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-03-27 15:19:45 +0400 |
| commit | 6d5cd9cb1e32e4f4e4468704430b26bcb0bfb129 (patch) | |
| tree | 8dbb4943c5bafc999421d395d8a1f656bbb35ca0 /drivers/gpu/drm/drm_cache.c | |
| parent | dbf7bff074d5fdc87c61b1b41d8e809109cf0bf8 (diff) | |
| download | linux-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.c | 23 |
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); |