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drm/cache: Use wbinvd helpers 

When the original drm code was written there were no centralized functions for
doing a coordinated wbinvd across all CPUs. Now (since 2010) there are, so use
them instead of rolling a new one.

v2: On x86 UP systems the wbinvd_on_all_cpus() is defined as a static inline in
smp.h. We must therefore include this file so we don't get compiler errors.
This error was found by 0-DAY kernel test infrastructure. We only need this for
x86.

Cc: Intel GFX <intel-gfx@lists.freedesktop.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2014-12-15 12:26:46 -08:00 committed by Daniel Vetter
parent 7432ca5ace
commit b04d4a38c0
1 changed files with 4 additions and 9 deletions
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13
drivers/gpu/drm/drm_cache.c
View File

@ -32,6 +32,7 @@
#include <drm/drmP.h>
#if defined(CONFIG_X86)
#include <asm/smp.h>
/*
* clflushopt is an unordered instruction which needs fencing with mfence or
@ -64,12 +65,6 @@ static void drm_cache_flush_clflush(struct page *pages[],
drm_clflush_page(*pages++);
mb();
}
static void
drm_clflush_ipi_handler(void *null)
{
wbinvd();
}
#endif
void
@ -82,7 +77,7 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages)
return;
}
if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
if (wbinvd_on_all_cpus())
printk(KERN_ERR "Timed out waiting for cache flush.\n");
#elif defined(__powerpc__)
@ -121,7 +116,7 @@ drm_clflush_sg(struct sg_table *st)
return;
}
if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
if (wbinvd_on_all_cpus())
printk(KERN_ERR "Timed out waiting for cache flush.\n");
#else
printk(KERN_ERR "Architecture has no drm_cache.c support\n");
@ -144,7 +139,7 @@ drm_clflush_virt_range(void *addr, unsigned long length)
return;
}
if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
if (wbinvd_on_all_cpus())
printk(KERN_ERR "Timed out waiting for cache flush.\n");
#else
printk(KERN_ERR "Architecture has no drm_cache.c support\n");