linux-kernel - [PATCH V5 20/20] platform/x86/intel/pmc: Show Die C6 counter on Meteor Lake

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Date:   Wed, 22 Nov 2023 20:03:55 -0800
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        ilpo.jarvinen@...ux.intel.com, rajvi.jingar@...ux.intel.com
Subject: [PATCH V5 20/20] platform/x86/intel/pmc: Show Die C6 counter on Meteor Lake

Expose the Die C6 counter on Meteor Lake.

Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
V5 - no change

V4 - no change

V3 - Split PATCH V2 13. Separates implementation (previous patch)
     from platform specific use (this patch)

 drivers/platform/x86/intel/pmc/mtl.c | 32 ++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/mtl.c b/drivers/platform/x86/intel/pmc/mtl.c
index 7ceeae507f4c..38c2f946ec23 100644
--- a/drivers/platform/x86/intel/pmc/mtl.c
+++ b/drivers/platform/x86/intel/pmc/mtl.c
@@ -10,12 +10,17 @@
 
 #include <linux/pci.h>
 #include "core.h"
+#include "../pmt/telemetry.h"
 
 /* PMC SSRAM PMT Telemetry GUIDS */
 #define SOCP_LPM_REQ_GUID	0x2625030
 #define IOEM_LPM_REQ_GUID	0x4357464
 #define IOEP_LPM_REQ_GUID	0x5077612
 
+/* Die C6 from PUNIT telemetry */
+#define MTL_PMT_DMU_DIE_C6_OFFSET	15
+#define MTL_PMT_DMU_GUID		0x1A067102
+
 static const u8 MTL_LPM_REG_INDEX[] = {0, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20};
 
 /*
@@ -968,6 +973,32 @@ static struct pmc_info mtl_pmc_info_list[] = {
 	{}
 };
 
+static void mtl_punit_pmt_init(struct pmc_dev *pmcdev)
+{
+	struct telem_endpoint *ep;
+	struct pci_dev *pcidev;
+
+	pcidev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(10, 0));
+	if (!pcidev) {
+		dev_err(&pmcdev->pdev->dev, "PUNIT PMT device not found.\n");
+		return;
+	}
+
+	ep = pmt_telem_find_and_register_endpoint(pcidev, MTL_PMT_DMU_GUID, 0);
+	if (IS_ERR(ep)) {
+		dev_err(&pmcdev->pdev->dev,
+			"pmc_core: couldn't get DMU telem endpoint, %ld\n",
+			PTR_ERR(ep));
+		return;
+	}
+
+	pci_dev_put(pcidev);
+	pmcdev->punit_ep = ep;
+
+	pmcdev->has_die_c6 = true;
+	pmcdev->die_c6_offset = MTL_PMT_DMU_DIE_C6_OFFSET;
+}
+
 #define MTL_GNA_PCI_DEV	0x7e4c
 #define MTL_IPU_PCI_DEV	0x7d19
 #define MTL_VPU_PCI_DEV	0x7d1d
@@ -1032,6 +1063,7 @@ int mtl_core_init(struct pmc_dev *pmcdev)
 	}
 
 	pmc_core_get_low_power_modes(pmcdev);
+	mtl_punit_pmt_init(pmcdev);
 
 	/* Due to a hardware limitation, the GBE LTR blocks PC10
 	 * when a cable is attached. Tell the PMC to ignore it.
-- 
2.34.1