drm/i915: Limit the number of loops for reading a split 64bit register

commit acd29f7b22262d9e848393b9b6ae13eb42d22514 upstream.

In I915_READ64_2x32 we attempt to read a 64bit register using 2 32bit
reads. Due to the nature of the registers we try to read in this manner,
they may increment between the two instruction (e.g. a timestamp
counter). To keep the result accurate, we repeat the read if we detect
an overflow (i.e. the upper value varies). However, some hardware is just
plain flaky and may endless loop as the the upper 32bits are not stable.
Just give up after a couple of tries and report whatever we read last.

v2: Use the most recent values when erring out on an unstable register.

Reported-by: russianneuromancer@ya.ru
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91906
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 683a9b004c1170cb0e85fed0993183f1eec6a909..7d53d7e15455614e074fe5847397a48023fc2483 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3190,13 +3190,13 @@ int intel_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, lower, tmp;                                          \
-       tmp = I915_READ(upper_reg);                                     \
+       u32 upper, lower, old_upper, loop = 0;                          \
+       upper = I915_READ(upper_reg);                                   \
        do {                                                            \
-               upper = tmp;                                            \
+               old_upper = upper;                                      \
                lower = I915_READ(lower_reg);                           \
-               tmp = I915_READ(upper_reg);                             \
-       } while (upper != tmp);                                         \
+               upper = I915_READ(upper_reg);                           \
+       } while (upper != old_upper && loop++ < 2);                     \
        (u64)upper << 32 | lower; })
 
 #define POSTING_READ(reg)      (void)I915_READ_NOTRACE(reg)