[PATCH V6 15/20] platform/x86/intel/pmc: Find and register PMC telemetry entries

David E. Box
2023-11-29T22:22:22Z

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 <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V6 - No change

V5 - no change

V4 - no change

V3 - no change

V2 - no change

drivers/platform/x86/intel/pmc/Kconfig | 1 +
drivers/platform/x86/intel/pmc/core_ssram.c | 49 +++++++++++++++++++++
2 files changed, 50 insertions(+)

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 @@ int pmc_core_ssram_init(struct pmc_dev *pmcdev)

return ret;
}
+MODULE_IMPORT_NS(INTEL_VSEC);
--
2.34.1