On Tue, Nov 14, 2017 at 03:05:03PM +0200, Valtteri Rantala wrote:
> Testing the texture read performance shows that the same tuning for the
> SQ credits is needed on GLK as on BXT/APL. This has been also confirmed
> by Altug from the HW team.
>
> Cc: Altug Koker <altug.ko...@intel.com>
> Signed-off-by: Valtteri Rantala <valtteri.rant...@intel.com>
With comments below, and unless Altug has objections:
Reviewed-by: David Weinehall <david.weineh...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_engine_cs.c | 17 +++++++++--------
> 1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
> b/drivers/gpu/drm/i915/intel_engine_cs.c
> index 70bbe8e..11fc0bd 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -1093,6 +1093,15 @@ static int gen9_init_workarounds(struct
> intel_engine_cs *engine)
> /* WaDisableSTUnitPowerOptimization:skl,bxt,kbl,glk,cfl */
> WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN2, GEN8_ST_PO_DISABLE);
>
> + /* WaProgramL3SqcReg1DefaultForPerf:bxt,glk */
> + if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER) ||
> + IS_GEMINILAKE(dev_priv)) {
Since we've dropped workarounds for pre-production Broxtons,
I think this could/should be simplified to:
if (IS_BROXTON(dev_priv) || IS_GEMINILAKE(dev_priv)) {
or even
if (IS_GEN9_LP(dev_priv)) {
But that's just nitpicking. The fix is sound from a performance
perspective.
> + u32 val = I915_READ(GEN8_L3SQCREG1);
> + val &= ~L3_PRIO_CREDITS_MASK;
> + val |= L3_GENERAL_PRIO_CREDITS(62) | L3_HIGH_PRIO_CREDITS(2);
> + I915_WRITE(GEN8_L3SQCREG1, val);
> + }
> +
> /* WaOCLCoherentLineFlush:skl,bxt,kbl,cfl */
> I915_WRITE(GEN8_L3SQCREG4, (I915_READ(GEN8_L3SQCREG4) |
> GEN8_LQSC_FLUSH_COHERENT_LINES));
> @@ -1258,14 +1267,6 @@ static int bxt_init_workarounds(struct intel_engine_cs
> *engine)
> return ret;
> }
>
> - /* WaProgramL3SqcReg1DefaultForPerf:bxt */
> - if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER)) {
> - u32 val = I915_READ(GEN8_L3SQCREG1);
> - val &= ~L3_PRIO_CREDITS_MASK;
> - val |= L3_GENERAL_PRIO_CREDITS(62) | L3_HIGH_PRIO_CREDITS(2);
> - I915_WRITE(GEN8_L3SQCREG1, val);
> - }
> -
> /* WaToEnableHwFixForPushConstHWBug:bxt */
> if (IS_BXT_REVID(dev_priv, BXT_REVID_C0, REVID_FOREVER))
> WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
> --
> 2.7.4
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