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[13/22] drm/i915/icl: WaAllowUMDToModifySamplerMode

Message ID 1523053518-20827-13-git-send-email-oscar.mateo@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

oscar.mateo@intel.com April 6, 2018, 10:25 p.m. UTC 
Required for Bindless samplers.

Do Linux UMDs make use of this? This change has been security
reviewed and the whitelisting approved. Virtualization of other
OSes could certainly use it.

Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h        | 2 ++
 drivers/gpu/drm/i915/intel_engine_cs.c | 5 +++++
 2 files changed, 7 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 04f2dd5..f2ae3cf 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8222,6 +8222,8 @@  enum {
 #define TR_VA_TTL3_PTR_DW0		_MMIO(0x4DE0)
 #define TR_VA_TTL3_PTR_DW1		_MMIO(0x4DE4)
 
+#define GEN10_SAMPLER_MODE		_MMIO(0xE18C)
+
 /* IVYBRIDGE DPF */
 #define GEN7_L3CDERRST1(slice)		_MMIO(0xB008 + (slice) * 0x200) /* L3CD Error Status 1 */
 #define   GEN7_L3CDERRST1_ROW_MASK	(0x7ff<<14)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 9400f4f..8337301 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1518,6 +1518,11 @@  static int icl_init_workarounds(struct intel_engine_cs *engine)
 	if (ret)
 		return ret;
 
+	/* WaAllowUMDToModifySamplerMode:icl */
+	ret = wa_ring_whitelist_reg(engine, GEN10_SAMPLER_MODE);
+	if (ret)
+		return ret;
+
 	return 0;
 }