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lib: Enable clflush for 32bit x86 builds

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-05-01 16:39:14 +01:00
parent 89f354e0a5
commit 7d08913aeb
1 changed files with 14 additions and 9 deletions
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23
lib/igt_gt.c
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@ -370,6 +370,7 @@ int igt_open_forcewake_handle(void)
} }
static unsigned int clflush_size; static unsigned int clflush_size;
#if defined(__x86_64__) || defined(__i386__)
int igt_setup_clflush(void) int igt_setup_clflush(void)
{ {
FILE *file; FILE *file;
@ -378,11 +379,6 @@ int igt_setup_clflush(void)
int first_stanza = 1; int first_stanza = 1;
int has_clflush = 0; int has_clflush = 0;
#if !defined(__x86_64__) && !defined(__SSE2__)
/* requires mfence + clflush, both SSE2 instructions */
return 0;
#endif
if (clflush_size) if (clflush_size)
return 1; return 1;
@ -414,9 +410,9 @@ int igt_setup_clflush(void)
return has_clflush && clflush_size; return has_clflush && clflush_size;
} }
__attribute__((target("sse2")))
void igt_clflush_range(void *addr, int size) void igt_clflush_range(void *addr, int size)
{ {
#if defined(__x86_64__) || defined(__SSE2__)
char *p, *end; char *p, *end;
end = (char *)addr + size; end = (char *)addr + size;
@ -427,10 +423,19 @@ void igt_clflush_range(void *addr, int size)
__builtin_ia32_clflush(p); __builtin_ia32_clflush(p);
__builtin_ia32_clflush(end - 1); /* magic serialisation for byt+ */ __builtin_ia32_clflush(end - 1); /* magic serialisation for byt+ */
__builtin_ia32_mfence(); __builtin_ia32_mfence();
#else
fprintf(stderr, "igt_clflush_range() unsupported\n");
#endif
} }
#else
int igt_setup_clflush(void)
{
/* requires mfence + clflush, both SSE2 instructions */
return 0;
}
void igt_clflush_range(void *addr, int size)
{
fprintf(stderr, "igt_clflush_range() unsupported\n");
}
#endif
/** /**
* intel_detect_and_clear_missed_irq: * intel_detect_and_clear_missed_irq: