[Intel-gfx] [PATCH v2 1/2] drm/i915/dg2: Add preemption changes for Wa_14015141709

[Matt Roper]

From: Akeem G Abodunrin <akeem.g.abodunrin at intel.com>

Starting with DG2, preemption can no longer be controlled using userspace
on a per-context basis. Instead, the hardware only allows us to enable or
disable preemption in a global, system-wide basis.  Also, we lose the
ability to specify the preemption granularity (such as batch-level vs
command-level vs object-level).

v2 (MattR):
 - Move debugfs interface to a separate patch.  (Jani)

Cc: Matt Roper <matthew.d.roper at intel.com>
Cc: Prathap Kumar Valsan <prathap.kumar.valsan at intel.com>
Cc: John Harrison <john.c.harrison at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 2 +-
 drivers/gpu/drm/i915/i915_drv.h             | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index beca8735bae5..f695a9c96c8d 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2310,7 +2310,7 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 			     FF_DOP_CLOCK_GATE_DISABLE);
 	}
 
-	if (IS_GRAPHICS_VER(i915, 9, 12)) {
+	if (HAS_PERCTX_PREEMPT_CTRL(i915)) {
 		/* FtrPerCtxtPreemptionGranularityControl:skl,bxt,kbl,cfl,cnl,icl,tgl */
 		wa_masked_en(wal,
 			     GEN7_FF_SLICE_CS_CHICKEN1,
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 943267393ecb..afefb3bd2714 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1396,6 +1396,9 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_GUC_DEPRIVILEGE(dev_priv) \
 	(INTEL_INFO(dev_priv)->has_guc_deprivilege)
 
+#define HAS_PERCTX_PREEMPT_CTRL(i915) \
+	((GRAPHICS_VER(i915) >= 9) &&  GRAPHICS_VER_FULL(i915) < IP_VER(12, 55))
+
 static inline bool run_as_guest(void)
 {
 	return !hypervisor_is_type(X86_HYPER_NATIVE);
-- 
2.34.1