266 lines
6.5 KiB
C
266 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* FPDT support for exporting boot and suspend/resume performance data
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*
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* Copyright (C) 2021 Intel Corporation. All rights reserved.
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*/
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#define pr_fmt(fmt) "ACPI FPDT: " fmt
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#include <linux/acpi.h>
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/*
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* FPDT contains ACPI table header and a number of fpdt_subtable_entries.
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* Each fpdt_subtable_entry points to a subtable: FBPT or S3PT.
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* Each FPDT subtable (FBPT/S3PT) is composed of a fpdt_subtable_header
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* and a number of fpdt performance records.
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* Each FPDT performance record is composed of a fpdt_record_header and
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* performance data fields, for boot or suspend or resume phase.
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*/
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enum fpdt_subtable_type {
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SUBTABLE_FBPT,
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SUBTABLE_S3PT,
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};
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struct fpdt_subtable_entry {
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u16 type; /* refer to enum fpdt_subtable_type */
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u8 length;
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u8 revision;
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u32 reserved;
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u64 address; /* physical address of the S3PT/FBPT table */
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};
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struct fpdt_subtable_header {
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u32 signature;
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u32 length;
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};
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enum fpdt_record_type {
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RECORD_S3_RESUME,
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RECORD_S3_SUSPEND,
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RECORD_BOOT,
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};
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struct fpdt_record_header {
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u16 type; /* refer to enum fpdt_record_type */
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u8 length;
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u8 revision;
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};
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struct resume_performance_record {
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struct fpdt_record_header header;
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u32 resume_count;
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u64 resume_prev;
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u64 resume_avg;
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} __attribute__((packed));
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struct boot_performance_record {
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struct fpdt_record_header header;
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u32 reserved;
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u64 firmware_start;
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u64 bootloader_load;
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u64 bootloader_launch;
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u64 exitbootservice_start;
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u64 exitbootservice_end;
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} __attribute__((packed));
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struct suspend_performance_record {
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struct fpdt_record_header header;
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u64 suspend_start;
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u64 suspend_end;
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} __attribute__((packed));
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static struct resume_performance_record *record_resume;
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static struct suspend_performance_record *record_suspend;
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static struct boot_performance_record *record_boot;
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#define FPDT_ATTR(phase, name) \
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static ssize_t name##_show(struct kobject *kobj, \
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struct kobj_attribute *attr, char *buf) \
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{ \
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return sprintf(buf, "%llu\n", record_##phase->name); \
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} \
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static struct kobj_attribute name##_attr = \
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__ATTR(name##_ns, 0444, name##_show, NULL)
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FPDT_ATTR(resume, resume_prev);
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FPDT_ATTR(resume, resume_avg);
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FPDT_ATTR(suspend, suspend_start);
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FPDT_ATTR(suspend, suspend_end);
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FPDT_ATTR(boot, firmware_start);
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FPDT_ATTR(boot, bootloader_load);
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FPDT_ATTR(boot, bootloader_launch);
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FPDT_ATTR(boot, exitbootservice_start);
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FPDT_ATTR(boot, exitbootservice_end);
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static ssize_t resume_count_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sprintf(buf, "%u\n", record_resume->resume_count);
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}
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static struct kobj_attribute resume_count_attr =
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__ATTR_RO(resume_count);
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static struct attribute *resume_attrs[] = {
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&resume_count_attr.attr,
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&resume_prev_attr.attr,
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&resume_avg_attr.attr,
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NULL
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};
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static const struct attribute_group resume_attr_group = {
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.attrs = resume_attrs,
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.name = "resume",
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};
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static struct attribute *suspend_attrs[] = {
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&suspend_start_attr.attr,
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&suspend_end_attr.attr,
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NULL
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};
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static const struct attribute_group suspend_attr_group = {
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.attrs = suspend_attrs,
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.name = "suspend",
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};
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static struct attribute *boot_attrs[] = {
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&firmware_start_attr.attr,
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&bootloader_load_attr.attr,
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&bootloader_launch_attr.attr,
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&exitbootservice_start_attr.attr,
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&exitbootservice_end_attr.attr,
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NULL
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};
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static const struct attribute_group boot_attr_group = {
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.attrs = boot_attrs,
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.name = "boot",
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};
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static struct kobject *fpdt_kobj;
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static int fpdt_process_subtable(u64 address, u32 subtable_type)
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{
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struct fpdt_subtable_header *subtable_header;
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struct fpdt_record_header *record_header;
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char *signature = (subtable_type == SUBTABLE_FBPT ? "FBPT" : "S3PT");
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u32 length, offset;
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int result;
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subtable_header = acpi_os_map_memory(address, sizeof(*subtable_header));
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if (!subtable_header)
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return -ENOMEM;
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if (strncmp((char *)&subtable_header->signature, signature, 4)) {
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pr_info(FW_BUG "subtable signature and type mismatch!\n");
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return -EINVAL;
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}
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length = subtable_header->length;
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acpi_os_unmap_memory(subtable_header, sizeof(*subtable_header));
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subtable_header = acpi_os_map_memory(address, length);
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if (!subtable_header)
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return -ENOMEM;
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offset = sizeof(*subtable_header);
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while (offset < length) {
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record_header = (void *)subtable_header + offset;
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offset += record_header->length;
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switch (record_header->type) {
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case RECORD_S3_RESUME:
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if (subtable_type != SUBTABLE_S3PT) {
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pr_err(FW_BUG "Invalid record %d for subtable %s\n",
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record_header->type, signature);
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return -EINVAL;
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}
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if (record_resume) {
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pr_err("Duplicate resume performance record found.\n");
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continue;
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}
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record_resume = (struct resume_performance_record *)record_header;
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result = sysfs_create_group(fpdt_kobj, &resume_attr_group);
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if (result)
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return result;
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break;
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case RECORD_S3_SUSPEND:
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if (subtable_type != SUBTABLE_S3PT) {
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pr_err(FW_BUG "Invalid %d for subtable %s\n",
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record_header->type, signature);
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continue;
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}
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if (record_suspend) {
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pr_err("Duplicate suspend performance record found.\n");
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continue;
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}
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record_suspend = (struct suspend_performance_record *)record_header;
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result = sysfs_create_group(fpdt_kobj, &suspend_attr_group);
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if (result)
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return result;
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break;
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case RECORD_BOOT:
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if (subtable_type != SUBTABLE_FBPT) {
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pr_err(FW_BUG "Invalid %d for subtable %s\n",
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record_header->type, signature);
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return -EINVAL;
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}
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if (record_boot) {
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pr_err("Duplicate boot performance record found.\n");
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continue;
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}
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record_boot = (struct boot_performance_record *)record_header;
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result = sysfs_create_group(fpdt_kobj, &boot_attr_group);
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if (result)
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return result;
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break;
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default:
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/* Other types are reserved in ACPI 6.4 spec. */
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break;
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}
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}
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return 0;
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}
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static int __init acpi_init_fpdt(void)
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{
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acpi_status status;
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struct acpi_table_header *header;
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struct fpdt_subtable_entry *subtable;
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u32 offset = sizeof(*header);
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status = acpi_get_table(ACPI_SIG_FPDT, 0, &header);
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if (ACPI_FAILURE(status))
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return 0;
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fpdt_kobj = kobject_create_and_add("fpdt", acpi_kobj);
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if (!fpdt_kobj) {
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acpi_put_table(header);
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return -ENOMEM;
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}
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while (offset < header->length) {
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subtable = (void *)header + offset;
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switch (subtable->type) {
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case SUBTABLE_FBPT:
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case SUBTABLE_S3PT:
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fpdt_process_subtable(subtable->address,
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subtable->type);
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break;
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default:
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/* Other types are reserved in ACPI 6.4 spec. */
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break;
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}
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offset += sizeof(*subtable);
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}
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return 0;
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}
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fs_initcall(acpi_init_fpdt);
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