On Fri, Sep 27, 2013 at 09:15:58AM +0100, Chris Wilson wrote: > On Thu, Sep 26, 2013 at 05:55:58PM -0700, Jesse Barnes wrote: > > We need to use the clock control reg to figure out how many CZ clks are in > > 30ns and use that as the basis for our RC6 residency calculations. > > > > v2: use ULL everywhere for consistency (Chris) > > factor out bias for clarity (Chris) > > I liked the NSEC_PER_MSEC as well :) > > > > > References: https://bugs.freedesktop.org/show_bug.cgi?id=69692 > > Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> > > --- > > drivers/gpu/drm/i915/i915_reg.h | 3 +++ > > drivers/gpu/drm/i915/i915_sysfs.c | 22 ++++++++++++++++++++-- > > 2 files changed, 23 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > > index cf995bb..6f8d0cf 100644 > > --- a/drivers/gpu/drm/i915/i915_reg.h > > +++ b/drivers/gpu/drm/i915/i915_reg.h > > @@ -1797,6 +1797,9 @@ > > */ > > #define HSW_CXT_TOTAL_SIZE (17 * PAGE_SIZE) > > > > +#define VLV_CLK_CTL2 0x101104 > > +#define CLK_CTL2_CZCOUNT_30NS_SHIFT 28 > > + > > /* > > * Overlay regs > > */ > > diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c > > index 44f4c1a..8003886 100644 > > --- a/drivers/gpu/drm/i915/i915_sysfs.c > > +++ b/drivers/gpu/drm/i915/i915_sysfs.c > > @@ -37,12 +37,30 @@ static u32 calc_residency(struct drm_device *dev, const u32 reg) > > { > > struct drm_i915_private *dev_priv = dev->dev_private; > > u64 raw_time; /* 32b value may overflow during fixed point math */ > > + u64 units = 128ULL, div = 100000ULL, bias = 100ULL; > > > > if (!intel_enable_rc6(dev)) > > return 0; > > > > - raw_time = I915_READ(reg) * 128ULL; > > - return DIV_ROUND_UP_ULL(raw_time, 100000); > > + /* On VLV, residency time is in CZ units rather than 1.28us */ > > + if (IS_VALLEYVIEW(dev)) { > > + u32 clkctl2; > > + > > + clkctl2 = I915_READ(VLV_CLK_CTL2) >> > > + CLK_CTL2_CZCOUNT_30NS_SHIFT; > > + if (!clkctl2) { > > + WARN(!clkctl2, "bogus CZ count value"); > > + return 0; > > + } > > + units = DIV_ROUND_UP_ULL(30ULL * bias, (u64)clkctl2); > > + if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH) > > + units <<= 8; > > + > > + div = 1000000ULL * bias; > > + } > > /* On VLV, residency time is in CZ units rather than 1.28us */ > if (IS_VALLEVIEW9dev)) { > u32 clkctl2; > > clkctl2 = I915_READ(VLV_CLK_CTL2) >> > CLK_CTL2_CZCOUNT_30NS_SHIFT; > if (!clkctl2) { > WARN(!clkctl2, "bogus CZ count value"); > return 0; > } > > units = DIV_ROUND_UP_ULL(30ULL * bias, (u64)clkctl2); > if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH) > units <<= 8; > > div = NSEC_PER_MSEC * bias; > } else { > units = 128; > div = USEC_PER_MSEC * bias; > } > > raw_time = I915_READ(reg) * units; > return DIV_ROUND_UP_ULL(raw_time, div); > > Either way, with or without the extra constants, > Both patches, > Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Both merged without further bikeshedding applied. Thanks for patches&review. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
