[PATCH v4 4/5] drm/i915/guc: Add WOPCM partitioning support for CNL

[Jackie Li]

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 at intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble at intel.com>
Cc: John Spotswood <john.a.spotswood at intel.com>
Cc: Jeff McGee <jeff.mcgee at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Jackie Li <yaodong.li at intel.com>
---
 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 61faf8f..684363b 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 2f9d03a..5bb5092 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