[Intel-gfx] [PATCH 2/3] drm/i915/guc: Use dedicated flag to track submission mode

[Michal Wajdeczko]

Instead of relying on enable_guc modparam to represent actual
GuC submission mode, use dedicated flag and look at modparam
only to check if submission was explicitly disabled by the user.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc.c           |  1 +
 drivers/gpu/drm/i915/gt/uc/intel_guc.h           |  7 +++++++
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c    | 16 ++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_submission.h    |  1 +
 drivers/gpu/drm/i915/gt/uc/intel_uc.h            |  3 +--
 5 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index 13fbbffd05c7..a75ef0096f15 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -82,6 +82,7 @@ void intel_guc_init_early(struct intel_guc *guc)
 	intel_guc_fw_init_early(guc);
 	intel_guc_ct_init_early(&guc->ct);
 	intel_guc_log_init_early(&guc->log);
+	intel_guc_submission_init_early(guc);
 
 	mutex_init(&guc->send_mutex);
 	spin_lock_init(&guc->irq_lock);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 5901506672cd..680625a0c722 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -64,6 +64,8 @@ struct intel_guc {
 	struct i915_vma *ads_vma;
 	struct __guc_ads_blob *ads_blob;
 
+	bool using_submission;
+
 	struct i915_vma *stage_desc_pool;
 	void *stage_desc_pool_vaddr;
 	struct ida stage_ids;
@@ -190,6 +192,11 @@ static inline int intel_guc_sanitize(struct intel_guc *guc)
 	return 0;
 }
 
+static inline bool intel_guc_is_submission_supported(struct intel_guc *guc)
+{
+	return guc->using_submission;
+}
+
 static inline void intel_guc_enable_msg(struct intel_guc *guc, u32 mask)
 {
 	spin_lock_irq(&guc->irq_lock);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index b4238fe16a03..b0cdbd9b2365 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1163,6 +1163,22 @@ void intel_guc_submission_disable(struct intel_guc *guc)
 	guc_clients_disable(guc);
 }
 
+static bool __force_no_guc_submission(void)
+{
+	/* XXX: GuC submission is unavailable for now */
+	return true;
+
+	return (i915_modparams.enable_guc == 0) ||
+	       ((i915_modparams.enable_guc > 0) &&
+		!(i915_modparams.enable_guc & ENABLE_GUC_SUBMISSION));
+}
+
+void intel_guc_submission_init_early(struct intel_guc *guc)
+{
+	guc->using_submission = intel_guc_is_supported(guc) &&
+				!__force_no_guc_submission();
+}
+
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftest_guc.c"
 #endif
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
index 87a38cb6faf3..c4ad2702ec8d 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
@@ -77,6 +77,7 @@ struct intel_guc_client {
 	I915_SELFTEST_DECLARE(bool use_nop_wqi);
 };
 
+void intel_guc_submission_init_early(struct intel_guc *guc);
 int intel_guc_submission_init(struct intel_guc *guc);
 int intel_guc_submission_enable(struct intel_guc *guc);
 void intel_guc_submission_disable(struct intel_guc *guc);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.h b/drivers/gpu/drm/i915/gt/uc/intel_uc.h
index c8e5ad9807db..96bd9a461c93 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.h
@@ -55,8 +55,7 @@ static inline bool intel_uc_is_using_guc(struct intel_uc *uc)
 
 static inline bool intel_uc_is_using_guc_submission(struct intel_uc *uc)
 {
-	GEM_BUG_ON(i915_modparams.enable_guc < 0);
-	return i915_modparams.enable_guc & ENABLE_GUC_SUBMISSION;
+	return intel_guc_is_submission_supported(&uc->guc);
 }
 
 static inline bool intel_uc_is_using_huc(struct intel_uc *uc)
-- 
2.19.2