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From: Chris Wilson <chris at chris-wilson.co.uk>
To: intel-gfx at lists.freedesktop.org
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Subject: [PATCH igt] igt/gen7_forcewake_mt: Make the mmio register as volatile
Date: Fri, 19 Jan 2018 23:11:13 +0000
Message-Id: <20180119231113.4908-1-chris at chris-wilson.co.uk>
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Content preview: Prevent the compiler from caching reads/writes to the hw
register
as we do want to perform mmio. Signed-off-by: Chris Wilson
<chris at chris-wilson.co.uk>
--- tests/gen7_forcewake_mt.c | 5 +++-- 1 file changed, 3 insertions(+),
2 deletions(-) [...]
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Prevent the compiler from caching reads/writes to the hw register as we
do want to perform mmio.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
tests/gen7_forcewake_mt.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tests/gen7_forcewake_mt.c b/tests/gen7_forcewake_mt.c
index 07320ef9e..8a23d13e0 100644
--- a/tests/gen7_forcewake_mt.c
+++ b/tests/gen7_forcewake_mt.c
@@ -106,8 +106,9 @@ static void *igfx_get_mmio(void)
static void *thread(void *arg)
{
struct thread *t = arg;
- uint32_t *forcewake_mt = (uint32_t *)((char *)t->mmio + FORCEWAKE_MT);
- uint32_t bit = 1 << t->bit;
+ const uint32_t bit = 1 << t->bit;
+ volatile uint32_t *forcewake_mt =
+ (volatile uint32_t *)((char *)t->mmio + FORCEWAKE_MT);
while (1) {
*forcewake_mt = bit << 16 | bit;
--
2.15.1
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