[PATCH v5 4/6] drm/i915/guc: Add WOPCM partitioning support for CNL

[Jackie Li <yaodong.li@xxxxxxxxx>]

CNL has different WOPCM size and hardware restriction on GuC
WOPCM size.

This patch returns the correct WOPCM reserved size on CNL and
adds the GuC WOPCM size check for CNL.

Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
Cc: John Spotswood <john.a.spotswood@xxxxxxxxx>
Cc: Jeff McGee <jeff.mcgee@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Signed-off-by: Jackie Li <yaodong.li@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_guc_wopcm.c | 21 +++++++++++++++++++++
 drivers/gpu/drm/i915/intel_guc_wopcm.h |  3 +++
 2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_guc_wopcm.c b/drivers/gpu/drm/i915/intel_guc_wopcm.c
index fd2ac12..2523fef 100644
--- a/drivers/gpu/drm/i915/intel_guc_wopcm.c
+++ b/drivers/gpu/drm/i915/intel_guc_wopcm.c
@@ -33,6 +33,9 @@ static inline u32 guc_reserved_wopcm_size(struct intel_guc *guc)
 	if (IS_GEN9_LP(i915))
 		return BXT_WOPCM_RC6_RESERVED;
 
+	if (IS_GEN10(i915))
+		return CNL_WOPCM_RESERVED;
+
 	return 0;
 }
 
@@ -58,6 +61,21 @@ static inline int gen9_wocpm_size_check(struct drm_i915_private *i915)
 	return 0;
 }
 
+static inline int cnl_a0_wopcm_size_check(struct drm_i915_private *i915)
+{
+	struct intel_guc_wopcm *wopcm = &i915->guc.wopcm;
+	u32 huc_size = intel_uc_fw_get_size(&i915->huc.fw);
+
+	/*
+	 * On CNL A0, hardware requires guc size to be larger than or equal to
+	 * HuC kernel size.
+	 */
+	if (unlikely(wopcm->size - GEN10_GUC_WOPCM_OFFSET < huc_size))
+		return -E2BIG;
+
+	return 0;
+}
+
 static inline int guc_wopcm_size_check(struct intel_guc *guc)
 {
 	struct drm_i915_private *i915 = guc_to_i915(guc);
@@ -65,6 +83,9 @@ static inline int guc_wopcm_size_check(struct intel_guc *guc)
 	if (IS_GEN9(i915))
 		return gen9_wocpm_size_check(i915);
 
+	if (IS_CNL_REVID(i915, CNL_REVID_A0, CNL_REVID_A0))
+		return cnl_a0_wopcm_size_check(i915);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/intel_guc_wopcm.h b/drivers/gpu/drm/i915/intel_guc_wopcm.h
index 352cf3d..0ce31ee 100644
--- a/drivers/gpu/drm/i915/intel_guc_wopcm.h
+++ b/drivers/gpu/drm/i915/intel_guc_wopcm.h
@@ -39,9 +39,12 @@ struct intel_guc;
 #define GUC_WOPCM_STACK_RESERVED	(0x2000)
 /* 24KB WOPCM reserved for RC6 CTX on BXT */
 #define BXT_WOPCM_RC6_RESERVED		(0x6000)
+/* 36KB WOPCM reserved on CNL */
+#define CNL_WOPCM_RESERVED		(0x9000)
 
 #define GEN9_GUC_WOPCM_DELTA		4
 #define GEN9_GUC_WOPCM_OFFSET		(0x24000)
+#define GEN10_GUC_WOPCM_OFFSET		(0x4000)
 
 struct intel_guc_wopcm {
 	u32 offset;
-- 
2.7.4

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