Merge branch 'acpi-tables'

* acpi-tables:
  ACPI: tables: introduce support for FPDT table

Documentation/ABI/testing/sysfs-firmware-acpi

+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

@@ -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

@@ -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

+// 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);