drm/i915/uc: Add explicit DISABLED state for firmware

We really need to have separate NOT_SUPPORTED state (for
lack of hardware support) and DISABLED state (to indicate
user decision) as we will have to take special steps even
if GuC firmware is now disabled but hardware exists and
could have been previously used.

v2: fix logic (Chris/CI)
v3: use proper check to avoid probe failure (CI)
v4: explain status transitions (Chris)
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190816205658.15020-1-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc.h

@@ -154,7 +154,12 @@ struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size);
 
 static inline bool intel_guc_is_supported(struct intel_guc *guc)
 {
-	return intel_uc_fw_supported(&guc->fw);
+	return intel_uc_fw_is_supported(&guc->fw);
+}
+
+static inline bool intel_guc_is_enabled(struct intel_guc *guc)
+{
+	return intel_uc_fw_is_enabled(&guc->fw);
 }
 
 static inline bool intel_guc_is_running(struct intel_guc *guc)

drivers/gpu/drm/i915/gt/uc/intel_huc.h

@@ -38,7 +38,12 @@ static inline int intel_huc_sanitize(struct intel_huc *huc)
 
 static inline bool intel_huc_is_supported(struct intel_huc *huc)
 {
-	return intel_uc_fw_supported(&huc->fw);
+	return intel_uc_fw_is_supported(&huc->fw);
+}
+
+static inline bool intel_huc_is_enabled(struct intel_huc *huc)
+{
+	return intel_uc_fw_is_enabled(&huc->fw);
 }
 
 static inline bool intel_huc_is_authenticated(struct intel_huc *huc)

drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c

@@ -35,7 +35,7 @@ void intel_huc_fw_init_early(struct intel_huc *huc)
 	struct drm_i915_private *i915 = gt->i915;
 
 	intel_uc_fw_init_early(&huc->fw, INTEL_UC_FW_TYPE_HUC,
-			       intel_uc_supports_guc(uc),
+			       intel_uc_uses_guc(uc),
 			       INTEL_INFO(i915)->platform, INTEL_REVID(i915));
 }
 

drivers/gpu/drm/i915/gt/uc/intel_uc.c

@@ -45,17 +45,17 @@ static void __confirm_options(struct intel_uc *uc)
 	DRM_DEV_DEBUG_DRIVER(i915->drm.dev,
 			     "enable_guc=%d (guc:%s submission:%s huc:%s)\n",
 			     i915_modparams.enable_guc,
-			     yesno(intel_uc_supports_guc(uc)),
-			     yesno(intel_uc_supports_guc_submission(uc)),
-			     yesno(intel_uc_supports_huc(uc)));
+			     yesno(intel_uc_uses_guc(uc)),
+			     yesno(intel_uc_uses_guc_submission(uc)),
+			     yesno(intel_uc_uses_huc(uc)));
 
 	if (i915_modparams.enable_guc == -1)
 		return;
 
 	if (i915_modparams.enable_guc == 0) {
-		GEM_BUG_ON(intel_uc_supports_guc(uc));
-		GEM_BUG_ON(intel_uc_supports_guc_submission(uc));
-		GEM_BUG_ON(intel_uc_supports_huc(uc));
+		GEM_BUG_ON(intel_uc_uses_guc(uc));
+		GEM_BUG_ON(intel_uc_uses_guc_submission(uc));
+		GEM_BUG_ON(intel_uc_uses_huc(uc));
 		return;
 	}
 
@@ -266,23 +266,23 @@ void intel_uc_fetch_firmwares(struct intel_uc *uc)
 	struct drm_i915_private *i915 = uc_to_gt(uc)->i915;
 	int err;
 
-	if (!intel_uc_supports_guc(uc))
+	if (!intel_uc_uses_guc(uc))
 		return;
 
 	err = intel_uc_fw_fetch(&uc->guc.fw, i915);
 	if (err)
 		return;
 
-	if (intel_uc_supports_huc(uc))
+	if (intel_uc_uses_huc(uc))
 		intel_uc_fw_fetch(&uc->huc.fw, i915);
 }
 
 void intel_uc_cleanup_firmwares(struct intel_uc *uc)
 {
-	if (!intel_uc_supports_guc(uc))
+	if (!intel_uc_uses_guc(uc))
 		return;
 
-	if (intel_uc_supports_huc(uc))
+	if (intel_uc_uses_huc(uc))
 		intel_uc_fw_cleanup_fetch(&uc->huc.fw);
 
 	intel_uc_fw_cleanup_fetch(&uc->guc.fw);
@@ -294,7 +294,7 @@ int intel_uc_init(struct intel_uc *uc)
 	struct intel_huc *huc = &uc->huc;
 	int ret;
 
-	if (!intel_uc_supports_guc(uc))
+	if (!intel_uc_uses_guc(uc))
 		return 0;
 
 	/* XXX: GuC submission is unavailable for now */
@@ -304,7 +304,7 @@ int intel_uc_init(struct intel_uc *uc)
 	if (ret)
 		return ret;
 
-	if (intel_uc_supports_huc(uc)) {
+	if (intel_uc_uses_huc(uc)) {
 		ret = intel_huc_init(huc);
 		if (ret)
 			goto out_huc;
@@ -321,10 +321,10 @@ void intel_uc_fini(struct intel_uc *uc)
 {
 	struct intel_guc *guc = &uc->guc;
 
-	if (!intel_uc_supports_guc(uc))
+	if (!intel_uc_uses_guc(uc))
 		return;
 
-	if (intel_uc_supports_huc(uc))
+	if (intel_uc_uses_huc(uc))
 		intel_huc_fini(&uc->huc);
 
 	intel_guc_fini(guc);
@@ -360,7 +360,7 @@ static int uc_init_wopcm(struct intel_uc *uc)
 	struct intel_uncore *uncore = gt->uncore;
 	u32 base = intel_wopcm_guc_base(&gt->i915->wopcm);
 	u32 size = intel_wopcm_guc_size(&gt->i915->wopcm);
-	u32 huc_agent = intel_uc_supports_huc(uc) ? HUC_LOADING_AGENT_GUC : 0;
+	u32 huc_agent = intel_uc_uses_huc(uc) ? HUC_LOADING_AGENT_GUC : 0;
 	u32 mask;
 	int err;
 
@@ -417,6 +417,9 @@ int intel_uc_init_hw(struct intel_uc *uc)
 	if (!intel_uc_supports_guc(uc))
 		return 0;
 
+	if (!intel_uc_uses_guc(uc))
+		return 0;
+
 	if (!intel_uc_fw_is_available(&guc->fw)) {
 		ret = intel_uc_fw_status_to_error(guc->fw.status);
 		goto err_out;
@@ -444,7 +447,7 @@ int intel_uc_init_hw(struct intel_uc *uc)
 		if (ret)
 			goto err_out;
 
-		if (intel_uc_supports_huc(uc)) {
+		if (intel_uc_uses_huc(uc)) {
 			ret = intel_huc_fw_upload(huc);
 			if (ret && intel_uc_fw_is_overridden(&huc->fw))
 				goto err_out;
@@ -490,7 +493,7 @@ int intel_uc_init_hw(struct intel_uc *uc)
 		 "submission",
 		 enableddisabled(intel_uc_supports_guc_submission(uc)));
 
-	if (intel_uc_supports_huc(uc)) {
+	if (intel_uc_uses_huc(uc)) {
 		dev_info(i915->drm.dev, "%s firmware %s version %u.%u %s:%s\n",
 			 intel_uc_fw_type_repr(INTEL_UC_FW_TYPE_HUC),
 			 huc->fw.path,

drivers/gpu/drm/i915/gt/uc/intel_uc.h

@@ -39,14 +39,29 @@ static inline bool intel_uc_supports_guc(struct intel_uc *uc)
 	return intel_guc_is_supported(&uc->guc);
 }
 
+static inline bool intel_uc_uses_guc(struct intel_uc *uc)
+{
+	return intel_guc_is_enabled(&uc->guc);
+}
+
 static inline bool intel_uc_supports_guc_submission(struct intel_uc *uc)
 {
 	return intel_guc_is_submission_supported(&uc->guc);
 }
 
+static inline bool intel_uc_uses_guc_submission(struct intel_uc *uc)
+{
+	return intel_guc_is_submission_supported(&uc->guc);
+}
+
 static inline bool intel_uc_supports_huc(struct intel_uc *uc)
 {
-	return intel_huc_is_supported(&uc->huc);
+	return intel_uc_supports_guc(uc);
+}
+
+static inline bool intel_uc_uses_huc(struct intel_uc *uc)
+{
+	return intel_huc_is_enabled(&uc->huc);
 }
 
 #endif

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c

@@ -206,8 +206,9 @@ void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,
 		__uc_fw_user_override(uc_fw);
 	}
 
-	intel_uc_fw_change_status(uc_fw, uc_fw->path && *uc_fw->path ?
+	intel_uc_fw_change_status(uc_fw, uc_fw->path ? *uc_fw->path ?
 				  INTEL_UC_FIRMWARE_SELECTED :
+				  INTEL_UC_FIRMWARE_DISABLED :
 				  INTEL_UC_FIRMWARE_NOT_SUPPORTED);
 }
 
@@ -266,7 +267,7 @@ int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
 	int err;
 
 	GEM_BUG_ON(!i915->wopcm.size);
-	GEM_BUG_ON(!intel_uc_fw_supported(uc_fw));
+	GEM_BUG_ON(!intel_uc_fw_is_enabled(uc_fw));
 
 	err = i915_inject_load_error(i915, -ENXIO);
 	if (err)

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h

@@ -18,9 +18,30 @@ struct intel_gt;
 /* Home of GuC, HuC and DMC firmwares */
 #define INTEL_UC_FIRMWARE_URL "https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/i915"
 
+/*
+ * +------------+---------------------------------------------------+
+ * |   PHASE    |           FIRMWARE STATUS TRANSITIONS             |
+ * +============+===================================================+
+ * |            |               UNINITIALIZED                       |
+ * +------------+-               /   |   \                         -+
+ * |            |   DISABLED <--/    |    \--> NOT_SUPPORTED        |
+ * | init_early |                    V                              |
+ * |            |                 SELECTED                          |
+ * +------------+-               /   |   \                         -+
+ * |            |    MISSING <--/    |    \--> ERROR                |
+ * |   fetch    |                    |                              |
+ * |            |        /------> AVAILABLE <---<-----------\       |
+ * +------------+-       \         /    \        \           \     -+
+ * |            |         FAIL <--<      \--> TRANSFERRED     \     |
+ * |   upload   |                  \           /   \          /     |
+ * |            |                   \---------/     \--> RUNNING    |
+ * +------------+---------------------------------------------------+
+ */
+
 enum intel_uc_fw_status {
-	INTEL_UC_FIRMWARE_NOT_SUPPORTED = -1, /* no uc HW or disabled */
+	INTEL_UC_FIRMWARE_NOT_SUPPORTED = -1, /* no uc HW */
 	INTEL_UC_FIRMWARE_UNINITIALIZED = 0, /* used to catch checks done too early */
+	INTEL_UC_FIRMWARE_DISABLED, /* disabled */
 	INTEL_UC_FIRMWARE_SELECTED, /* selected the blob we want to load */
 	INTEL_UC_FIRMWARE_MISSING, /* blob not found on the system */
 	INTEL_UC_FIRMWARE_ERROR, /* invalid format or version */
@@ -84,6 +105,8 @@ const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status)
 		return "N/A";
 	case INTEL_UC_FIRMWARE_UNINITIALIZED:
 		return "UNINITIALIZED";
+	case INTEL_UC_FIRMWARE_DISABLED:
+		return "DISABLED";
 	case INTEL_UC_FIRMWARE_SELECTED:
 		return "SELECTED";
 	case INTEL_UC_FIRMWARE_MISSING:
@@ -106,7 +129,10 @@ static inline int intel_uc_fw_status_to_error(enum intel_uc_fw_status status)
 {
 	switch (status) {
 	case INTEL_UC_FIRMWARE_NOT_SUPPORTED:
+		return -ENODEV;
 	case INTEL_UC_FIRMWARE_UNINITIALIZED:
+		return -EACCES;
+	case INTEL_UC_FIRMWARE_DISABLED:
 		return -EPERM;
 	case INTEL_UC_FIRMWARE_MISSING:
 		return -ENOENT;
@@ -142,6 +168,16 @@ __intel_uc_fw_status(struct intel_uc_fw *uc_fw)
 	return uc_fw->status;
 }
 
+static inline bool intel_uc_fw_is_supported(struct intel_uc_fw *uc_fw)
+{
+	return __intel_uc_fw_status(uc_fw) != INTEL_UC_FIRMWARE_NOT_SUPPORTED;
+}
+
+static inline bool intel_uc_fw_is_enabled(struct intel_uc_fw *uc_fw)
+{
+	return __intel_uc_fw_status(uc_fw) > INTEL_UC_FIRMWARE_DISABLED;
+}
+
 static inline bool intel_uc_fw_is_available(struct intel_uc_fw *uc_fw)
 {
 	return __intel_uc_fw_status(uc_fw) >= INTEL_UC_FIRMWARE_AVAILABLE;
@@ -157,11 +193,6 @@ static inline bool intel_uc_fw_is_running(struct intel_uc_fw *uc_fw)
 	return __intel_uc_fw_status(uc_fw) == INTEL_UC_FIRMWARE_RUNNING;
 }
 
-static inline bool intel_uc_fw_supported(struct intel_uc_fw *uc_fw)
-{
-	return __intel_uc_fw_status(uc_fw) != INTEL_UC_FIRMWARE_NOT_SUPPORTED;
-}
-
 static inline bool intel_uc_fw_is_overridden(const struct intel_uc_fw *uc_fw)
 {
 	return uc_fw->user_overridden;

drivers/gpu/drm/i915/i915_drv.h

@@ -2215,8 +2215,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_GT_UC(dev_priv)	(INTEL_INFO(dev_priv)->has_gt_uc)
 
 /* Having GuC is not the same as using GuC */
-#define USES_GUC(dev_priv)		intel_uc_supports_guc(&(dev_priv)->gt.uc)
-#define USES_GUC_SUBMISSION(dev_priv)	intel_uc_supports_guc_submission(&(dev_priv)->gt.uc)
+#define USES_GUC(dev_priv)		intel_uc_uses_guc(&(dev_priv)->gt.uc)
+#define USES_GUC_SUBMISSION(dev_priv)	intel_uc_uses_guc_submission(&(dev_priv)->gt.uc)
 
 #define HAS_POOLED_EU(dev_priv)	(INTEL_INFO(dev_priv)->has_pooled_eu)