ACPI: tables: introduce support for FPDT table (d1eb86e5) · Commits · EulixOS / Software / Kernel

Documentation/ABI/testing/sysfs-firmware-acpi

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		What: /sys/firmware/acpi/fpdt/
		Date: Jan 2021
		Contact: Zhang Rui <rui.zhang@intel.com>
		Description:
		ACPI Firmware Performance Data Table (FPDT) provides
		information for firmware performance data for system boot,
		S3 suspend and S3 resume. This sysfs entry contains the
		performance data retrieved from the FPDT.

		boot:
		firmware_start_ns: Timer value logged at the beginning
		of firmware image execution. In nanoseconds.
		bootloader_load_ns: Timer value logged just prior to
		loading the OS boot loader into memory.
		In nanoseconds.
		bootloader_launch_ns: Timer value logged just prior to
		launching the currently loaded OS boot loader
		image. In nanoseconds.
		exitbootservice_start_ns: Timer value logged at the
		point when the OS loader calls the
		ExitBootServices function for UEFI compatible
		firmware. In nanoseconds.
		exitbootservice_end_ns: Timer value logged at the point
		just prior to the OS loader gaining control
		back from the ExitBootServices function for
		UEFI compatible firmware. In nanoseconds.
		suspend:
		suspend_start_ns: Timer value recorded at the previous
		OS write to SLP_TYP upon entry to S3. In
		nanoseconds.
		suspend_end_ns: Timer value recorded at the previous
		firmware write to SLP_TYP used to trigger
		hardware entry to S3. In nanoseconds.
		resume:
		resume_count: A count of the number of S3 resume cycles
		since the last full boot sequence.
		resume_avg_ns: Average timer value of all resume cycles
		logged since the last full boot sequence,
		including the most recent resume. In nanoseconds.
		resume_prev_ns: Timer recorded at the end of the previous
		platform runtime firmware S3 resume, just prior to
		handoff to the OS waking vector. In nanoseconds.

		What: /sys/firmware/acpi/bgrt/
		Date: January 2012
		Contact: Matthew Garrett <mjg@redhat.com>

drivers/acpi/Kconfig

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		@@ -87,6 +87,14 @@ config ACPI_SPCR_TABLE
		This table provides information about the configuration of the
		earlycon console.

		config ACPI_FPDT
		bool "ACPI Firmware Performance Data Table (FPDT) support"
		depends on X86_64
		help
		Enable support for the Firmware Performance Data Table (FPDT).
		This table provides information on the timing of the system
		boot, S3 suspend and S3 resume firmware code paths.

		config ACPI_LPIT
		bool
		depends on X86_64

drivers/acpi/Makefile

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		@@ -57,6 +57,7 @@ acpi-$(CONFIG_X86) += x86/utils.o
		acpi-$(CONFIG_X86) += x86/s2idle.o
		acpi-$(CONFIG_DEBUG_FS) += debugfs.o
		acpi-y += acpi_lpat.o
		acpi-$(CONFIG_ACPI_FPDT) += acpi_fpdt.o
		acpi-$(CONFIG_ACPI_LPIT) += acpi_lpit.o
		acpi-$(CONFIG_ACPI_GENERIC_GSI) += irq.o
		acpi-$(CONFIG_ACPI_WATCHDOG) += acpi_watchdog.o

drivers/acpi/acpi_fpdt.c

0 → 100644

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		// SPDX-License-Identifier: GPL-2.0-only

		/*
		* FPDT support for exporting boot and suspend/resume performance data
		*
		* Copyright (C) 2021 Intel Corporation. All rights reserved.
		*/

		#define pr_fmt(fmt) "ACPI FPDT: " fmt

		#include <linux/acpi.h>

		/*
		* FPDT contains ACPI table header and a number of fpdt_subtable_entries.
		* Each fpdt_subtable_entry points to a subtable: FBPT or S3PT.
		* Each FPDT subtable (FBPT/S3PT) is composed of a fpdt_subtable_header
		* and a number of fpdt performance records.
		* Each FPDT performance record is composed of a fpdt_record_header and
		* performance data fields, for boot or suspend or resume phase.
		*/
		enum fpdt_subtable_type {
		SUBTABLE_FBPT,
		SUBTABLE_S3PT,
		};

		struct fpdt_subtable_entry {
		u16 type; /* refer to enum fpdt_subtable_type */
		u8 length;
		u8 revision;
		u32 reserved;
		u64 address; /* physical address of the S3PT/FBPT table */
		};

		struct fpdt_subtable_header {
		u32 signature;
		u32 length;
		};

		enum fpdt_record_type {
		RECORD_S3_RESUME,
		RECORD_S3_SUSPEND,
		RECORD_BOOT,
		};

		struct fpdt_record_header {
		u16 type; /* refer to enum fpdt_record_type */
		u8 length;
		u8 revision;
		};

		struct resume_performance_record {
		struct fpdt_record_header header;
		u32 resume_count;
		u64 resume_prev;
		u64 resume_avg;
		} __attribute__((packed));

		struct boot_performance_record {
		struct fpdt_record_header header;
		u32 reserved;
		u64 firmware_start;
		u64 bootloader_load;
		u64 bootloader_launch;
		u64 exitbootservice_start;
		u64 exitbootservice_end;
		} __attribute__((packed));

		struct suspend_performance_record {
		struct fpdt_record_header header;
		u64 suspend_start;
		u64 suspend_end;
		} __attribute__((packed));


		static struct resume_performance_record *record_resume;
		static struct suspend_performance_record *record_suspend;
		static struct boot_performance_record *record_boot;

		#define FPDT_ATTR(phase, name) \
		static ssize_t name##_show(struct kobject *kobj, \
		struct kobj_attribute attr, char buf) \
		{ \
		return sprintf(buf, "%llu\n", record_##phase->name); \
		} \
		static struct kobj_attribute name##_attr = \
		__ATTR(name##_ns, 0444, name##_show, NULL)

		FPDT_ATTR(resume, resume_prev);
		FPDT_ATTR(resume, resume_avg);
		FPDT_ATTR(suspend, suspend_start);
		FPDT_ATTR(suspend, suspend_end);
		FPDT_ATTR(boot, firmware_start);
		FPDT_ATTR(boot, bootloader_load);
		FPDT_ATTR(boot, bootloader_launch);
		FPDT_ATTR(boot, exitbootservice_start);
		FPDT_ATTR(boot, exitbootservice_end);

		static ssize_t resume_count_show(struct kobject *kobj,
		struct kobj_attribute attr, char buf)
		{
		return sprintf(buf, "%u\n", record_resume->resume_count);
		}

		static struct kobj_attribute resume_count_attr =
		__ATTR_RO(resume_count);

		static struct attribute *resume_attrs[] = {
		&resume_count_attr.attr,
		&resume_prev_attr.attr,
		&resume_avg_attr.attr,
		NULL
		};

		static const struct attribute_group resume_attr_group = {
		.attrs = resume_attrs,
		.name = "resume",
		};

		static struct attribute *suspend_attrs[] = {
		&suspend_start_attr.attr,
		&suspend_end_attr.attr,
		NULL
		};

		static const struct attribute_group suspend_attr_group = {
		.attrs = suspend_attrs,
		.name = "suspend",
		};

		static struct attribute *boot_attrs[] = {
		&firmware_start_attr.attr,
		&bootloader_load_attr.attr,
		&bootloader_launch_attr.attr,
		&exitbootservice_start_attr.attr,
		&exitbootservice_end_attr.attr,
		NULL
		};

		static const struct attribute_group boot_attr_group = {
		.attrs = boot_attrs,
		.name = "boot",
		};

		static struct kobject *fpdt_kobj;

		static int fpdt_process_subtable(u64 address, u32 subtable_type)
		{
		struct fpdt_subtable_header *subtable_header;
		struct fpdt_record_header *record_header;
		char *signature = (subtable_type == SUBTABLE_FBPT ? "FBPT" : "S3PT");
		u32 length, offset;
		int result;

		subtable_header = acpi_os_map_memory(address, sizeof(*subtable_header));
		if (!subtable_header)
		return -ENOMEM;

		if (strncmp((char *)&subtable_header->signature, signature, 4)) {
		pr_info(FW_BUG "subtable signature and type mismatch!\n");
		return -EINVAL;
		}

		length = subtable_header->length;
		acpi_os_unmap_memory(subtable_header, sizeof(*subtable_header));

		subtable_header = acpi_os_map_memory(address, length);
		if (!subtable_header)
		return -ENOMEM;

		offset = sizeof(*subtable_header);
		while (offset < length) {
		record_header = (void *)subtable_header + offset;
		offset += record_header->length;

		switch (record_header->type) {
		case RECORD_S3_RESUME:
		if (subtable_type != SUBTABLE_S3PT) {
		pr_err(FW_BUG "Invalid record %d for subtable %s\n",
		record_header->type, signature);
		return -EINVAL;
		}
		if (record_resume) {
		pr_err("Duplicate resume performance record found.\n");
		continue;
		}
		record_resume = (struct resume_performance_record *)record_header;
		result = sysfs_create_group(fpdt_kobj, &resume_attr_group);
		if (result)
		return result;
		break;
		case RECORD_S3_SUSPEND:
		if (subtable_type != SUBTABLE_S3PT) {
		pr_err(FW_BUG "Invalid %d for subtable %s\n",
		record_header->type, signature);
		continue;
		}
		if (record_suspend) {
		pr_err("Duplicate suspend performance record found.\n");
		continue;
		}
		record_suspend = (struct suspend_performance_record *)record_header;
		result = sysfs_create_group(fpdt_kobj, &suspend_attr_group);
		if (result)
		return result;
		break;
		case RECORD_BOOT:
		if (subtable_type != SUBTABLE_FBPT) {
		pr_err(FW_BUG "Invalid %d for subtable %s\n",
		record_header->type, signature);
		return -EINVAL;
		}
		if (record_boot) {
		pr_err("Duplicate boot performance record found.\n");
		continue;
		}
		record_boot = (struct boot_performance_record *)record_header;
		result = sysfs_create_group(fpdt_kobj, &boot_attr_group);
		if (result)
		return result;
		break;

		default:
		pr_err(FW_BUG "Invalid record %d found.\n", record_header->type);
		return -EINVAL;
		}
		}
		return 0;
		}

		static int __init acpi_init_fpdt(void)
		{
		acpi_status status;
		struct acpi_table_header *header;
		struct fpdt_subtable_entry *subtable;
		u32 offset = sizeof(*header);

		status = acpi_get_table(ACPI_SIG_FPDT, 0, &header);

		if (ACPI_FAILURE(status))
		return 0;

		fpdt_kobj = kobject_create_and_add("fpdt", acpi_kobj);
		if (!fpdt_kobj)
		return -ENOMEM;

		while (offset < header->length) {
		subtable = (void *)header + offset;
		switch (subtable->type) {
		case SUBTABLE_FBPT:
		case SUBTABLE_S3PT:
		fpdt_process_subtable(subtable->address,
		subtable->type);
		break;
		default:
		pr_info(FW_BUG "Invalid subtable type %d found.\n",
		subtable->type);
		break;
		}
		offset += sizeof(*subtable);
		}
		return 0;
		}

		fs_initcall(acpi_init_fpdt);