From: Michał Winiarski <michal.winiar...@intel.com>
Supporting fine-granularity preemption levels may require changes in
userspace batch buffer programming. Therefore, we need to fallback to
safe default values, rather that use hardware defaults. Userspace is
still able to enable fine-granularity, since we're whitelisting the
register controlling it in WaEnablePreemptionGranularityControlByUMD.
v2: Extend w/a to cover Cannonlake
Signed-off-by: Michał Winiarski <michal.winiar...@intel.com>
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 6 ++++++
drivers/gpu/drm/i915/intel_engine_cs.c | 25 +++++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ee0d4f14ac98..70465320a0ed 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6993,6 +6993,12 @@ enum {
#define GEN9_CS_DEBUG_MODE1 _MMIO(0x20ec)
#define GEN9_CTX_PREEMPT_REG _MMIO(0x2248)
#define GEN8_CS_CHICKEN1 _MMIO(0x2580)
+#define GEN9_PREEMPT_3D_OBJECT_LEVEL (1<<0)
+#define GEN9_PREEMPT_GPGPU_LEVEL(hi, lo) (((hi) << 2) | ((lo) << 1))
+#define GEN9_PREEMPT_GPGPU_MID_THREAD_LEVEL GEN9_PREEMPT_GPGPU_LEVEL(0, 0)
+#define GEN9_PREEMPT_GPGPU_THREAD_GROUP_LEVEL GEN9_PREEMPT_GPGPU_LEVEL(0, 1)
+#define GEN9_PREEMPT_GPGPU_COMMAND_LEVEL GEN9_PREEMPT_GPGPU_LEVEL(1, 0)
+#define GEN9_PREEMPT_GPGPU_LEVEL_MASK GEN9_PREEMPT_GPGPU_LEVEL(1, 1)
/* GEN7 chicken */
#define GEN7_COMMON_SLICE_CHICKEN1 _MMIO(0x7010)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
b/drivers/gpu/drm/i915/intel_engine_cs.c
index 040c85e496fa..2460d78581b4 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1071,6 +1071,24 @@ static int gen9_init_workarounds(struct intel_engine_cs
*engine)
I915_WRITE(GEN8_L3SQCREG4, (I915_READ(GEN8_L3SQCREG4) |
GEN8_LQSC_FLUSH_COHERENT_LINES));
+ /*
+ * Supporting preemption with fine-granularity requires changes in the
+ * batch buffer programming. Since we can't break old userspace, we
+ * need to set our default preemption level to safe value. Userspace is
+ * still able to use more fine-grained preemption levels, since in
+ * WaEnablePreemptionGranularityControlByUMD we're whitelisting the
+ * per-ctx register. As such, WaDisableMidCmdPreemption is not a real
+ * HW workaround, but merely a way to start using preemption while
+ * maintaining old contract with userspace.
+ */
+
+ /* WaDisable3DMidCmdPreemption:skl,bxt,glk,cfl,[cnl] */
+ WA_CLR_BIT_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_3D_OBJECT_LEVEL);
+
+ /* WaDisableGPGPUMidCmdPreemption:skl,bxt,blk,cfl,[cnl] */
+ WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_GPGPU_LEVEL_MASK,
+ GEN9_PREEMPT_GPGPU_COMMAND_LEVEL);
+
/* WaVFEStateAfterPipeControlwithMediaStateClear:skl,bxt,glk,cfl */
ret = wa_ring_whitelist_reg(engine, GEN9_CTX_PREEMPT_REG);
if (ret)
@@ -1272,6 +1290,13 @@ static int cnl_init_workarounds(struct intel_engine_cs
*engine)
/* FtrEnableFastAnisoL1BankingFix: cnl */
WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3, CNL_FAST_ANISO_L1_BANKING_FIX);
+ /* WaDisable3DMidCmdPreemption:cnl */
+ WA_CLR_BIT_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_3D_OBJECT_LEVEL);
+
+ /* WaDisableGPGPUMidCmdPreemption:cnl */
+ WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_GPGPU_LEVEL_MASK,
+ GEN9_PREEMPT_GPGPU_COMMAND_LEVEL);
+
/* WaEnablePreemptionGranularityControlByUMD:cnl */
I915_WRITE(GEN7_FF_SLICE_CS_CHICKEN1,
_MASKED_BIT_ENABLE(GEN9_FFSC_PERCTX_PREEMPT_CTRL));
--
2.14.2
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