drm/i915/dg2: Add preemption changes for Wa_14015141709

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)
v3 (MattR):
 - Drop the debugfs support completely for now.

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
Cc: John Harrison <john.c.harrison@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220318021051.2073847-1-matthew.d.roper@intel.com

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index c328d46..dc0ffff 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2316,7 +2316,7 @@ 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 5764363..86f95f4 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1400,6 +1400,9 @@ 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);