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Message-Id: <1440713521-5906-102-git-send-email-kamal@canonical.com>
Date: Thu, 27 Aug 2015 15:11:32 -0700
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Chris Wilson <chris@...is-wilson.co.uk>,
Michał Winiarski <michal.winiarski@...el.com>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 101/130] drm/i915: Replace WARN inside I915_READ64_2x32 with retry loop
3.19.8-ckt6 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Chris Wilson <chris@...is-wilson.co.uk>
commit ee0a227b7ac6e75f28e10269f81c7ec6eb600952 upstream.
Since we may conceivably encounter situations where the upper part of the
64bit register changes between reads, for example when a timestamp
counter overflows, change the WARN into a retry loop.
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@...el.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
drivers/gpu/drm/i915/i915_drv.h | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 44a3c38..46ef49b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2996,15 +2996,14 @@ int vlv_freq_opcode(struct drm_i915_private *dev_priv, int val);
#define I915_READ64(reg) dev_priv->uncore.funcs.mmio_readq(dev_priv, (reg), true)
#define I915_READ64_2x32(lower_reg, upper_reg) ({ \
- u32 upper = I915_READ(upper_reg); \
- u32 lower = I915_READ(lower_reg); \
- u32 tmp = I915_READ(upper_reg); \
- if (upper != tmp) { \
- upper = tmp; \
- lower = I915_READ(lower_reg); \
- WARN_ON(I915_READ(upper_reg) != upper); \
- } \
- (u64)upper << 32 | lower; })
+ u32 upper, lower, tmp; \
+ tmp = I915_READ(upper_reg); \
+ do { \
+ upper = tmp; \
+ lower = I915_READ(lower_reg); \
+ tmp = I915_READ(upper_reg); \
+ } while (upper != tmp); \
+ (u64)upper << 32 | lower; })
#define POSTING_READ(reg) (void)I915_READ_NOTRACE(reg)
#define POSTING_READ16(reg) (void)I915_READ16_NOTRACE(reg)
--
1.9.1
--
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