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authorKyle McMartin <kyle@mcmartin.ca>2008-01-17 18:51:56 -0500
committerEric Anholt <eric@anholt.net>2008-01-17 16:55:44 -0800
commitc6f175cbea1dba3fc26426243acc55b89b8a8064 (patch)
treecdf5d0b2106e9afef173d96b92c21d72ff40095a /linux-core
parent44a9fa8cc6c7d598163d1885bf69e4bf747a004b (diff)
i915: fix invalid opcode exception on cpus without clflush
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>
Diffstat (limited to 'linux-core')
-rw-r--r--linux-core/i915_buffer.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/linux-core/i915_buffer.c b/linux-core/i915_buffer.c
index 3dd236dd..08067476 100644
--- a/linux-core/i915_buffer.c
+++ b/linux-core/i915_buffer.c
@@ -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();
}