platform/x86: Intel PMT Telemetry capability driver (68fe8e6e) · Commits · 戴 / test

drivers/platform/x86/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -1374,6 +1374,17 @@ config INTEL_PMT_CLASS
		To compile this driver as a module, choose M here: the module
		will be called intel_pmt_class.

		config INTEL_PMT_TELEMETRY
		tristate "Intel Platform Monitoring Technology (PMT) Telemetry driver"
		select INTEL_PMT_CLASS
		help
		The Intel Platform Monitory Technology (PMT) Telemetry driver provides
		access to hardware telemetry metrics on devices that support the
		feature.

		To compile this driver as a module, choose M here: the module
		will be called intel_pmt_telemetry.

		config INTEL_PUNIT_IPC
		tristate "Intel P-Unit IPC Driver"
		help

drivers/platform/x86/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -141,6 +141,7 @@ obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o
		obj-$(CONFIG_INTEL_MRFLD_PWRBTN) += intel_mrfld_pwrbtn.o
		obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o intel_pmc_core_pltdrv.o
		obj-$(CONFIG_INTEL_PMT_CLASS) += intel_pmt_class.o
		obj-$(CONFIG_INTEL_PMT_TELEMETRY) += intel_pmt_telemetry.o
		obj-$(CONFIG_INTEL_PUNIT_IPC) += intel_punit_ipc.o
		obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o
		obj-$(CONFIG_INTEL_SCU_PCI) += intel_scu_pcidrv.o

drivers/platform/x86/intel_pmt_telemetry.c

0 → 100644

+160 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Intel Platform Monitory Technology Telemetry driver
		*
		* Copyright (c) 2020, Intel Corporation.
		* All Rights Reserved.
		*
		* Author: "David E. Box" <david.e.box@linux.intel.com>
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/pci.h>
		#include <linux/slab.h>
		#include <linux/uaccess.h>
		#include <linux/overflow.h>

		#include "intel_pmt_class.h"

		#define TELEM_DEV_NAME "pmt_telemetry"

		#define TELEM_SIZE_OFFSET 0x0
		#define TELEM_GUID_OFFSET 0x4
		#define TELEM_BASE_OFFSET 0x8
		#define TELEM_ACCESS(v) ((v) & GENMASK(3, 0))
		/* size is in bytes */
		#define TELEM_SIZE(v) (((v) & GENMASK(27, 12)) >> 10)

		/* Used by client hardware to identify a fixed telemetry entry*/
		#define TELEM_CLIENT_FIXED_BLOCK_GUID 0x10000000

		struct pmt_telem_priv {
		int num_entries;
		struct intel_pmt_entry entry[];
		};

		/*
		* Early implementations of PMT on client platforms have some
		* differences from the server platforms (which use the Out Of Band
		* Management Services Module OOBMSM). This list tracks those
		* platforms as needed to handle those differences. Newer client
		* platforms are expected to be fully compatible with server.
		*/
		static const struct pci_device_id pmt_telem_early_client_pci_ids[] = {
		{ PCI_VDEVICE(INTEL, 0x9a0d) }, /* TGL */
		{ PCI_VDEVICE(INTEL, 0x467d) }, /* ADL */
		{ }
		};

		static bool intel_pmt_is_early_client_hw(struct device *dev)
		{
		struct pci_dev *parent = to_pci_dev(dev->parent);

		return !!pci_match_id(pmt_telem_early_client_pci_ids, parent);
		}

		static bool pmt_telem_region_overlaps(struct intel_pmt_entry *entry,
		struct device *dev)
		{
		u32 guid = readl(entry->disc_table + TELEM_GUID_OFFSET);

		if (guid != TELEM_CLIENT_FIXED_BLOCK_GUID)
		return false;

		return intel_pmt_is_early_client_hw(dev);
		}

		static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
		struct intel_pmt_header *header,
		struct device *dev)
		{
		void __iomem *disc_table = entry->disc_table;

		if (pmt_telem_region_overlaps(entry, dev))
		return 1;

		header->access_type = TELEM_ACCESS(readl(disc_table));
		header->guid = readl(disc_table + TELEM_GUID_OFFSET);
		header->base_offset = readl(disc_table + TELEM_BASE_OFFSET);

		/* Size is measured in DWORDS, but accessor returns bytes */
		header->size = TELEM_SIZE(readl(disc_table));

		return 0;
		}

		static DEFINE_XARRAY_ALLOC(telem_array);
		static struct intel_pmt_namespace pmt_telem_ns = {
		.name = "telem",
		.xa = &telem_array,
		.pmt_header_decode = pmt_telem_header_decode,
		};

		static int pmt_telem_remove(struct platform_device *pdev)
		{
		struct pmt_telem_priv *priv = platform_get_drvdata(pdev);
		int i;

		for (i = 0; i < priv->num_entries; i++)
		intel_pmt_dev_destroy(&priv->entry[i], &pmt_telem_ns);

		return 0;
		}

		static int pmt_telem_probe(struct platform_device *pdev)
		{
		struct pmt_telem_priv *priv;
		size_t size;
		int i, ret;

		size = struct_size(priv, entry, pdev->num_resources);
		priv = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
		if (!priv)
		return -ENOMEM;

		platform_set_drvdata(pdev, priv);

		for (i = 0; i < pdev->num_resources; i++) {
		struct intel_pmt_entry *entry = &priv->entry[i];

		ret = intel_pmt_dev_create(entry, &pmt_telem_ns, pdev, i);
		if (ret < 0)
		goto abort_probe;
		if (ret)
		continue;

		priv->num_entries++;
		}

		return 0;
		abort_probe:
		pmt_telem_remove(pdev);
		return ret;
		}

		static struct platform_driver pmt_telem_driver = {
		.driver = {
		.name = TELEM_DEV_NAME,
		},
		.remove = pmt_telem_remove,
		.probe = pmt_telem_probe,
		};

		static int __init pmt_telem_init(void)
		{
		return platform_driver_register(&pmt_telem_driver);
		}
		module_init(pmt_telem_init);

		static void __exit pmt_telem_exit(void)
		{
		platform_driver_unregister(&pmt_telem_driver);
		xa_destroy(&telem_array);
		}
		module_exit(pmt_telem_exit);

		MODULE_AUTHOR("David E. Box <david.e.box@linux.intel.com>");
		MODULE_DESCRIPTION("Intel PMT Telemetry driver");
		MODULE_ALIAS("platform:" TELEM_DEV_NAME);
		MODULE_LICENSE("GPL v2");

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