[Intel-xe] [PATCH v3 2/3] drm/xe/uc: Fix uC status tracking

[Daniele Ceraolo Spurio]

The current uC status tracking has a few issues:

1) the HuC is moved to "disabled" instead of "not supported"

2) the status is left uninitialized instead of "disabled" when the
   modparam is used to disable support

3) due to #1, a number of checks are done against "disabled" instead of
   the appropriate status.

Address all of those by making sure to follow the appropriate state
transition and checking against the required state.

v2: rebase on s/guc_submission_enabled/uc_enabled/

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Reviewed-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/xe/xe_guc.c   |  3 +++
 drivers/gpu/drm/xe/xe_huc.c   | 15 +++++++--------
 drivers/gpu/drm/xe/xe_uc.c    | 10 +++++++---
 drivers/gpu/drm/xe/xe_uc_fw.c | 14 ++++++++------
 drivers/gpu/drm/xe/xe_wopcm.c |  3 +--
 5 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_guc.c b/drivers/gpu/drm/xe/xe_guc.c
index 134019fdda7e..84f0b5488783 100644
--- a/drivers/gpu/drm/xe/xe_guc.c
+++ b/drivers/gpu/drm/xe/xe_guc.c
@@ -242,6 +242,9 @@ int xe_guc_init(struct xe_guc *guc)
 	if (ret)
 		goto out;
 
+	if (!xe_uc_fw_is_enabled(&guc->fw))
+		return 0;
+
 	ret = xe_guc_log_init(&guc->log);
 	if (ret)
 		goto out;
diff --git a/drivers/gpu/drm/xe/xe_huc.c b/drivers/gpu/drm/xe/xe_huc.c
index c856da1e9422..293403d16f25 100644
--- a/drivers/gpu/drm/xe/xe_huc.c
+++ b/drivers/gpu/drm/xe/xe_huc.c
@@ -43,22 +43,21 @@ int xe_huc_init(struct xe_huc *huc)
 	if (ret)
 		goto out;
 
+	if (!xe_uc_fw_is_enabled(&huc->fw))
+		return 0;
+
 	xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_LOADABLE);
 
 	return 0;
 
 out:
-	if (xe_uc_fw_is_disabled(&huc->fw)) {
-		drm_info(&xe->drm, "HuC disabled\n");
-		return 0;
-	}
 	drm_err(&xe->drm, "HuC init failed with %d", ret);
 	return ret;
 }
 
 int xe_huc_upload(struct xe_huc *huc)
 {
-	if (xe_uc_fw_is_disabled(&huc->fw))
+	if (!xe_uc_fw_is_loadable(&huc->fw))
 		return 0;
 	return xe_uc_fw_upload(&huc->fw, 0, HUC_UKERNEL);
 }
@@ -70,7 +69,7 @@ int xe_huc_auth(struct xe_huc *huc)
 	struct xe_guc *guc = huc_to_guc(huc);
 	int ret;
 
-	if (xe_uc_fw_is_disabled(&huc->fw))
+	if (!xe_uc_fw_is_loadable(&huc->fw))
 		return 0;
 
 	xe_assert(xe, !xe_uc_fw_is_running(&huc->fw));
@@ -107,7 +106,7 @@ int xe_huc_auth(struct xe_huc *huc)
 
 void xe_huc_sanitize(struct xe_huc *huc)
 {
-	if (xe_uc_fw_is_disabled(&huc->fw))
+	if (!xe_uc_fw_is_loadable(&huc->fw))
 		return;
 	xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_LOADABLE);
 }
@@ -119,7 +118,7 @@ void xe_huc_print_info(struct xe_huc *huc, struct drm_printer *p)
 
 	xe_uc_fw_print(&huc->fw, p);
 
-	if (xe_uc_fw_is_disabled(&huc->fw))
+	if (!xe_uc_fw_is_enabled(&huc->fw))
 		return;
 
 	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
diff --git a/drivers/gpu/drm/xe/xe_uc.c b/drivers/gpu/drm/xe/xe_uc.c
index 5b7d6177c1c2..784f53c5f282 100644
--- a/drivers/gpu/drm/xe/xe_uc.c
+++ b/drivers/gpu/drm/xe/xe_uc.c
@@ -31,9 +31,10 @@ int xe_uc_init(struct xe_uc *uc)
 {
 	int ret;
 
-	/* GuC submission not enabled, nothing to do */
-	if (!xe_device_uc_enabled(uc_to_xe(uc)))
-		return 0;
+	/*
+	 * We call the GuC/HuC init functions even if GuC submission is off to
+	 * correctly move our tracking of the FW state to "disabled".
+	 */
 
 	ret = xe_guc_init(&uc->guc);
 	if (ret)
@@ -43,6 +44,9 @@ int xe_uc_init(struct xe_uc *uc)
 	if (ret)
 		goto err;
 
+	if (!xe_device_uc_enabled(uc_to_xe(uc)))
+		return 0;
+
 	ret = xe_wopcm_init(&uc->wopcm);
 	if (ret)
 		goto err;
diff --git a/drivers/gpu/drm/xe/xe_uc_fw.c b/drivers/gpu/drm/xe/xe_uc_fw.c
index 7e9b56c812e7..e1e24b873717 100644
--- a/drivers/gpu/drm/xe/xe_uc_fw.c
+++ b/drivers/gpu/drm/xe/xe_uc_fw.c
@@ -340,17 +340,19 @@ int xe_uc_fw_init(struct xe_uc_fw *uc_fw)
 	xe_assert(xe, !uc_fw->path);
 
 	uc_fw_auto_select(xe, uc_fw);
-	xe_uc_fw_change_status(uc_fw, uc_fw->path ? *uc_fw->path ?
+	xe_uc_fw_change_status(uc_fw, uc_fw->path ?
 			       XE_UC_FIRMWARE_SELECTED :
-			       XE_UC_FIRMWARE_DISABLED :
 			       XE_UC_FIRMWARE_NOT_SUPPORTED);
 
-	/* Transform no huc in the list into firmware disabled */
-	if (uc_fw->type == XE_UC_FW_TYPE_HUC && !xe_uc_fw_is_supported(uc_fw)) {
+	if (!xe_uc_fw_is_supported(uc_fw))
+		return 0;
+
+	if (!xe_device_uc_enabled(xe)) {
 		xe_uc_fw_change_status(uc_fw, XE_UC_FIRMWARE_DISABLED);
-		err = -ENOPKG;
-		return err;
+		drm_dbg(&xe->drm, "%s disabled", xe_uc_fw_type_repr(uc_fw->type));
+		return 0;
 	}
+
 	err = request_firmware(&fw, uc_fw->path, dev);
 	if (err)
 		goto fail;
diff --git a/drivers/gpu/drm/xe/xe_wopcm.c b/drivers/gpu/drm/xe/xe_wopcm.c
index 9a85bcc18830..bf85d4fa56cc 100644
--- a/drivers/gpu/drm/xe/xe_wopcm.c
+++ b/drivers/gpu/drm/xe/xe_wopcm.c
@@ -139,8 +139,7 @@ static int __wopcm_init_regs(struct xe_device *xe, struct xe_gt *gt,
 {
 	u32 base = wopcm->guc.base;
 	u32 size = wopcm->guc.size;
-	u32 huc_agent = xe_uc_fw_is_disabled(&gt->uc.huc.fw) ? 0 :
-		HUC_LOADING_AGENT_GUC;
+	u32 huc_agent = xe_uc_fw_is_available(&gt->uc.huc.fw) ? HUC_LOADING_AGENT_GUC : 0;
 	u32 mask;
 	int err;
 
-- 
2.41.0