platform/x86/intel/pmc: Find and register PMC telemetry entries

The PMC SSRAM device contains counters that are structured in Intel
Platform Monitoring Technology (PMT) telemetry regions. Look for and
register these telemetry regions from the driver so that they may be read
using the Intel PMT ABI.

Signed-off-by: David E. Box <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Hans de Goede <[email protected]>

2 files changed, 50 insertions, 0 deletions

diff --git a/drivers/platform/x86/intel/pmc/Kconfig b/drivers/platform/x86/intel/pmc/Kconfig
index b526597e4deb..d2f651fbec2c 100644
--- a/drivers/platform/x86/intel/pmc/Kconfig
+++ b/drivers/platform/x86/intel/pmc/Kconfig
@@ -7,6 +7,7 @@ config INTEL_PMC_CORE
 	tristate "Intel PMC Core driver"
 	depends on PCI
 	depends on ACPI
+	depends on INTEL_PMT_TELEMETRY
 	help
 	  The Intel Platform Controller Hub for Intel Core SoCs provides access
 	  to Power Management Controller registers via various interfaces. This
diff --git a/drivers/platform/x86/intel/pmc/core_ssram.c b/drivers/platform/x86/intel/pmc/core_ssram.c
index c1b984255571..9ca720f9cbb2 100644
--- a/drivers/platform/x86/intel/pmc/core_ssram.c
+++ b/drivers/platform/x86/intel/pmc/core_ssram.c
@@ -13,6 +13,8 @@
 #include <linux/io-64-nonatomic-lo-hi.h>
 
 #include "core.h"
+#include "../vsec.h"
+#include "../pmt/telemetry.h"
 
 #define SSRAM_HDR_SIZE		0x100
 #define SSRAM_PWRM_OFFSET	0x14
@@ -24,6 +26,49 @@
 
 DEFINE_FREE(pmc_core_iounmap, void __iomem *, iounmap(_T));
 
+static void
+pmc_add_pmt(struct pmc_dev *pmcdev, u64 ssram_base, void __iomem *ssram)
+{
+	struct pci_dev *pcidev = pmcdev->ssram_pcidev;
+	struct intel_vsec_platform_info info = {};
+	struct intel_vsec_header *headers[2] = {};
+	struct intel_vsec_header header;
+	void __iomem *dvsec;
+	u32 dvsec_offset;
+	u32 table, hdr;
+
+	ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
+	if (!ssram)
+		return;
+
+	dvsec_offset = readl(ssram + SSRAM_DVSEC_OFFSET);
+	iounmap(ssram);
+
+	dvsec = ioremap(ssram_base + dvsec_offset, SSRAM_DVSEC_SIZE);
+	if (!dvsec)
+		return;
+
+	hdr = readl(dvsec + PCI_DVSEC_HEADER1);
+	header.id = readw(dvsec + PCI_DVSEC_HEADER2);
+	header.rev = PCI_DVSEC_HEADER1_REV(hdr);
+	header.length = PCI_DVSEC_HEADER1_LEN(hdr);
+	header.num_entries = readb(dvsec + INTEL_DVSEC_ENTRIES);
+	header.entry_size = readb(dvsec + INTEL_DVSEC_SIZE);
+
+	table = readl(dvsec + INTEL_DVSEC_TABLE);
+	header.tbir = INTEL_DVSEC_TABLE_BAR(table);
+	header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
+	iounmap(dvsec);
+
+	headers[0] = &header;
+	info.caps = VSEC_CAP_TELEMETRY;
+	info.headers = headers;
+	info.base_addr = ssram_base;
+	info.parent = &pmcdev->pdev->dev;
+
+	intel_vsec_register(pcidev, &info);
+}
+
 static const struct pmc_reg_map *pmc_core_find_regmap(struct pmc_info *list, u16 devid)
 {
 	for (; list->map; ++list)
@@ -101,6 +146,9 @@ pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, int pmc_idx, u32 offset)
 	pwrm_base = get_base(ssram, SSRAM_PWRM_OFFSET);
 	devid = readw(ssram + SSRAM_DEVID_OFFSET);
 
+	/* Find and register and PMC telemetry entries */
+	pmc_add_pmt(pmcdev, ssram_base, ssram);
+
 	map = pmc_core_find_regmap(pmcdev->regmap_list, devid);
 	if (!map)
 		return -ENODEV;
@@ -140,3 +188,4 @@ release_dev:
 
 	return ret;
 }
+MODULE_IMPORT_NS(INTEL_VSEC);