linux-kernel - [PATCH 07/15] platform/x86/intel/vsec: Add new Discovery feature

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Message-ID: <20250430212106.369208-8-david.e.box@linux.intel.com>
Date: Wed, 30 Apr 2025 14:20:56 -0700
From: "David E. Box" <david.e.box@...ux.intel.com>
To: linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	david.e.box@...ux.intel.com,
	srinivas.pandruvada@...ux.intel.com,
	andriy.shevchenko@...ux.intel.com,
	ilpo.jarvinen@...ux.intel.com,
	tony.luck@...el.com,
	xi.pardee@...ux.intel.com
Cc: hdegoede@...hat.com
Subject: [PATCH 07/15] platform/x86/intel/vsec: Add new Discovery feature

Add the PCIe VSEC ID for new Intel Platform Monitoring Technology
Capability Discovery feature. Discovery provides detailed information for
the various Intel VSEC features. Also make the driver a supplier for
TPMI and Telemetry drivers which will use the information.

Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
 drivers/platform/x86/intel/vsec.c | 26 ++++++++++++++++++++++++--
 include/linux/intel_vsec.h        |  4 +++-
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 5374abef0b48..e3ec17a53e62 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -65,6 +65,9 @@ static const char *intel_vsec_name(enum intel_vsec_id id)
 	case VSEC_ID_TPMI:
 		return "tpmi";
 
+	case VSEC_ID_DISCOVERY:
+		return "discovery";
+
 	default:
 		return NULL;
 	}
@@ -83,6 +86,8 @@ static bool intel_vsec_supported(u16 id, unsigned long caps)
 		return !!(caps & VSEC_CAP_SDSI);
 	case VSEC_ID_TPMI:
 		return !!(caps & VSEC_CAP_TPMI);
+	case VSEC_ID_DISCOVERY:
+		return !!(caps & VSEC_CAP_DISCOVERY);
 	default:
 		return false;
 	}
@@ -140,6 +145,8 @@ static bool vsec_driver_present(int cap_id)
 		return IS_ENABLED(CONFIG_INTEL_SDSI);
 	case VSEC_CAP_TPMI:
 		return IS_ENABLED(CONFIG_INTEL_TPMI);
+	case VSEC_CAP_DISCOVERY:
+		return IS_ENABLED(CONFIG_INTEL_PMT_DISCOVERY);
 	default:
 		return false;
 	}
@@ -392,6 +399,9 @@ static int get_cap_id(u32 header_id, unsigned long *cap_id)
 	case VSEC_ID_TPMI:
 		*cap_id = ilog2(VSEC_CAP_TPMI);
 		break;
+	case VSEC_ID_DISCOVERY:
+		*cap_id = ilog2(VSEC_CAP_DISCOVERY);
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -677,14 +687,26 @@ static const struct intel_vsec_platform_info mtl_info = {
 	.caps = VSEC_CAP_TELEMETRY,
 };
 
+static const struct vsec_feature_dependency oobmsm_deps[] = {
+	{
+		.feature = VSEC_CAP_TELEMETRY,
+		.supplier_bitmap = VSEC_CAP_DISCOVERY
+	},
+};
+
 /* OOBMSM info */
 static const struct intel_vsec_platform_info oobmsm_info = {
-	.caps = VSEC_CAP_TELEMETRY | VSEC_CAP_SDSI | VSEC_CAP_TPMI,
+	.caps = VSEC_CAP_TELEMETRY | VSEC_CAP_SDSI | VSEC_CAP_TPMI |
+		VSEC_CAP_DISCOVERY,
+	.deps = oobmsm_deps,
+	.num_deps = ARRAY_SIZE(oobmsm_deps),
 };
 
 /* DMR OOBMSM info */
 static const struct intel_vsec_platform_info dmr_oobmsm_info = {
-	.caps = VSEC_CAP_TELEMETRY | VSEC_CAP_TPMI,
+	.caps = VSEC_CAP_TELEMETRY | VSEC_CAP_TPMI | VSEC_CAP_DISCOVERY,
+	.deps = oobmsm_deps,
+	.num_deps = ARRAY_SIZE(oobmsm_deps),
 };
 
 /* TGL info */
diff --git a/include/linux/intel_vsec.h b/include/linux/intel_vsec.h
index 71067afaca99..a07796d7d43b 100644
--- a/include/linux/intel_vsec.h
+++ b/include/linux/intel_vsec.h
@@ -16,7 +16,8 @@
 #define VSEC_CAP_CRASHLOG	BIT(3)
 #define VSEC_CAP_SDSI		BIT(4)
 #define VSEC_CAP_TPMI		BIT(5)
-#define VSEC_FEATURE_COUNT	6
+#define VSEC_CAP_DISCOVERY	BIT(6)
+#define VSEC_FEATURE_COUNT	7
 
 /* Intel DVSEC offsets */
 #define INTEL_DVSEC_ENTRIES		0xA
@@ -33,6 +34,7 @@ enum intel_vsec_id {
 	VSEC_ID_TELEMETRY	= 2,
 	VSEC_ID_WATCHER		= 3,
 	VSEC_ID_CRASHLOG	= 4,
+	VSEC_ID_DISCOVERY	= 12,
 	VSEC_ID_SDSI		= 65,
 	VSEC_ID_TPMI		= 66,
 };
-- 
2.43.0