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Commit 6d5cd9cb authored by Daniel Vetter's avatar Daniel Vetter
Browse files

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: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent dbf7bff0

drivers/gpu/drm/drm_cache.c

+23 −0
Original line number Diff line number Diff line
@@ -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);

include/drm/drmP.h

+1 −0
Original line number Diff line number Diff line
@@ -1332,6 +1332,7 @@ extern int drm_remove_magic(struct drm_master *master, drm_magic_t magic); 


/* 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,