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.
Cc: stable@kernel.org 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 5928653..c7c8f6b 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); diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 1f9e951..ededdd0 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1331,6 +1331,7 @@ extern int drm_authmagic(struct drm_device *dev, void *data,
/* Cache management (drm_cache.c) */ void drm_clflush_pages(struct page *pages[], unsigned long num_pages); +void drm_clflush_virt_range(char *addr, unsigned long length);
/* Locking IOCTL support (drm_lock.h) */ extern int drm_lock(struct drm_device *dev, void *data,