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i915: fix invalid opcode exception on cpus without clflush

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i915_flush_ttm was unconditionally executing a clflush instruction
to (obviously) flush the cache. Instead, check if the cpu supports
clflush, and if not, fall back to calling wbinvd to flush the entire
cache.

Signed-off-by: Kyle McMartin <kmcmartin@redhat.com>
This commit is contained in:
Kyle McMartin 2008-01-17 18:51:56 -05:00 • committed by Eric Anholt
parent 44a9fa8cc6
commit c6f175cbea
1 changed files with 11 additions and 0 deletions
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11
linux-core/i915_buffer.c
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@ -286,7 +286,18 @@ void i915_flush_ttm(struct drm_ttm *ttm)
return;
DRM_MEMORYBARRIER();
#ifdef CONFIG_X86_32
/* Hopefully nobody has built an x86-64 processor without clflush */
if (!cpu_has_clflush) {
wbinvd();
DRM_MEMORYBARRIER();
return;
}
#endif
for (i = ttm->num_pages - 1; i >= 0; i--)
drm_cache_flush_page(drm_ttm_get_page(ttm, i));
DRM_MEMORYBARRIER();
}