I want to do explicit clflushes in the GL driver as well.
Jason and I figured this was small enough that we may as well just copy
and paste it for now, as we don't have a decent common location for both
drivers.
Irritatingly, because we include brw_context.h in C++ code, we have
to use char * instead of void * to avoid piles of GCC warnings from
-Wpointer-arith. In GNU C it works fine.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_context.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_context.h
b/src/mesa/drivers/dri/i965/brw_context.h
index aa1499a1fe1..b032d511a1e 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -1203,6 +1203,22 @@ struct brw_context
struct intel_screen *screen;
};
+#define CACHELINE_SIZE 64
+#define CACHELINE_MASK 63
+
+static inline void
+brw_clflush_range(void *start, size_t size)
+{
+ char *p = (char *) (((uintptr_t) start) & ~CACHELINE_MASK);
+ char *end = (char *) start + size;
+
+ __builtin_ia32_mfence();
+ while (p < end) {
+ __builtin_ia32_clflush(p);
+ p += CACHELINE_SIZE;
+ }
+}
+
/* brw_clear.c */
extern void intelInitClearFuncs(struct dd_function_table *functions);
--
2.11.0
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