Re: [Intel-gfx] [PATCH v2] drm/i915: Limit the number of loops for reading a split 64bit register
On Tue, 08 Sep 2015, Daniel Vetterwrote: > On Tue, Sep 08, 2015 at 02:17:13PM +0100, Chris Wilson wrote: >> 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 harware 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: russianneuroman...@ya.ru >> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91906 >> Signed-off-by: Chris Wilson >> Cc: Michał Winiarski >> Cc: Daniel Vetter >> Cc: Jani Nikula >> Cc: sta...@vger.kernel.org > > Still Reviewed-by: Daniel Vetter Pushed to drm-intel-next-fixes, thanks for the patch and review. BR, Jani. > >> --- >> drivers/gpu/drm/i915/i915_drv.h | 10 +- >> 1 file changed, 5 insertions(+), 5 deletions(-) >> >> diff --git a/drivers/gpu/drm/i915/i915_drv.h >> b/drivers/gpu/drm/i915/i915_drv.h >> index 12870073d58f..51a88e70a6f7 100644 >> --- a/drivers/gpu/drm/i915/i915_drv.h >> +++ b/drivers/gpu/drm/i915/i915_drv.h >> @@ -3402,13 +3402,13 @@ 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) >> -- >> 2.5.1 >> > > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch -- Jani Nikula, Intel Open Source Technology Center ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
Re: [Intel-gfx] [PATCH v2] drm/i915: Limit the number of loops for reading a split 64bit register
On Tue, Sep 08, 2015 at 02:17:13PM +0100, Chris Wilson wrote: > 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 harware 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: russianneuroman...@ya.ru > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91906 > Signed-off-by: Chris Wilson> Cc: Michał Winiarski > Cc: Daniel Vetter > Cc: Jani Nikula > Cc: sta...@vger.kernel.org Still Reviewed-by: Daniel Vetter > --- > drivers/gpu/drm/i915/i915_drv.h | 10 +- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h > index 12870073d58f..51a88e70a6f7 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -3402,13 +3402,13 @@ 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) > -- > 2.5.1 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
[Intel-gfx] [PATCH v2] drm/i915: Limit the number of loops for reading a split 64bit register
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 harware 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: russianneuroman...@ya.ru Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91906 Signed-off-by: Chris WilsonCc: Michał Winiarski Cc: Daniel Vetter Cc: Jani Nikula Cc: sta...@vger.kernel.org --- drivers/gpu/drm/i915/i915_drv.h | 10 +- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 12870073d58f..51a88e70a6f7 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -3402,13 +3402,13 @@ 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) -- 2.5.1 ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx