[Intel-gfx] [PATCH] drm/i915: disable sampler indirect state in bindless heap

[Lionel Landwerlin]

By default the indirect state sampler data (border colors) are stored
in the same heap as the SAMPLER_STATE structure. For userspace drivers
that can be 2 different heaps (dynamic state heap & bindless sampler
state heap). This means that border colors have to copied in 2
different places so that the same SAMPLER_STATE structure find the
right data.

This change is forcing the indirect state sampler data to only be in
the dynamic state pool (more convinient for userspace drivers, they
only have to have one copy of the border colors). This is reproducing
the behavior of the Windows drivers.

BSpec: 46052

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Cc: stable at vger.kernel.org
Reviewed-by: Haridhar Kalvala <haridhar.kalvala at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_regs.h     |  1 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 492b3de6678d7..fd1f9cd35e9d7 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1145,6 +1145,7 @@
 #define   SC_DISABLE_POWER_OPTIMIZATION_EBB	REG_BIT(9)
 #define   GEN11_SAMPLER_ENABLE_HEADLESS_MSG	REG_BIT(5)
 #define   MTL_DISABLE_SAMPLER_SC_OOO		REG_BIT(3)
+#define   GEN11_INDIRECT_STATE_BASE_ADDR_OVERRIDE	REG_BIT(0)
 
 #define GEN9_HALF_SLICE_CHICKEN7		MCR_REG(0xe194)
 #define   DG2_DISABLE_ROUND_ENABLE_ALLOW_FOR_SSLA	REG_BIT(15)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 6ea453ddd0116..b925ef47304b6 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -2971,6 +2971,25 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
 
 	add_render_compute_tuning_settings(i915, wal);
 
+	if (GRAPHICS_VER(i915) >= 11) {
+		/* This is not a Wa (although referred to as
+		 * WaSetInidrectStateOverride in places), this allows
+		 * applications that reference sampler states through
+		 * the BindlessSamplerStateBaseAddress to have their
+		 * border color relative to DynamicStateBaseAddress
+		 * rather than BindlessSamplerStateBaseAddress.
+		 *
+		 * Otherwise SAMPLER_STATE border colors have to be
+		 * copied in multiple heaps (DynamicStateBaseAddress &
+		 * BindlessSamplerStateBaseAddress)
+		 *
+		 * BSpec: 46052
+		 */
+		wa_mcr_masked_en(wal,
+				 GEN10_SAMPLER_MODE,
+				 GEN11_INDIRECT_STATE_BASE_ADDR_OVERRIDE);
+	}
+
 	if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_B0, STEP_FOREVER) ||
 	    IS_MTL_GRAPHICS_STEP(i915, P, STEP_B0, STEP_FOREVER))
 		/* Wa_14017856879 */
-- 
2.34.1