| Message ID | 20210115100220.21686-1-rui.zhang@intel.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | ACPI: introduce support for FPDT table | expand |
Sorry that I lost track of this patch for a long time. Now it seems that this feature is needed, when /dev/mem is not available. Thanks, rui > -----Original Message----- > From: Zhang, Rui <rui.zhang@intel.com> > Sent: Friday, January 15, 2021 6:02 PM > To: linux-acpi@vger.kernel.org > Cc: rjw@rjwysocki.net; Brandt, Todd E <todd.e.brandt@intel.com>; Zhang, > Rui <rui.zhang@intel.com> > Subject: [PATCH] ACPI: introduce support for FPDT table > Importance: High > > ACPI Firmware Performance Data Table (FPDT) provides information about > firmware performance during system boot, S3 suspend and S3 resume. > > Have the kernel parse the FPDT table, and expose the firmware performance > data to userspace as sysfs attributes under /sys/firmware/acpi/fpdt/. > > Tested-by: Todd Brandt <todd.e.brandt@linux.intel.com> > Signed-off-by: Zhang Rui <rui.zhang@intel.com> > --- > Documentation/ABI/testing/sysfs-firmware-acpi | 43 +++ > drivers/acpi/Kconfig | 8 + > drivers/acpi/Makefile | 1 + > drivers/acpi/acpi_fpdt.c | 263 ++++++++++++++++++ > 4 files changed, 315 insertions(+) > create mode 100644 drivers/acpi/acpi_fpdt.c > > diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi > b/Documentation/ABI/testing/sysfs-firmware-acpi > index b16d30a71709..819939d858c9 100644 > --- a/Documentation/ABI/testing/sysfs-firmware-acpi > +++ b/Documentation/ABI/testing/sysfs-firmware-acpi > @@ -1,3 +1,46 @@ > +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> > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index > ebcf534514be..84930fa2dc32 100644 > --- a/drivers/acpi/Kconfig > +++ b/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)" > + 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 > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index > 076894a3330f..eb93bb7b6479 100644 > --- a/drivers/acpi/Makefile > +++ b/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 > diff --git a/drivers/acpi/acpi_fpdt.c b/drivers/acpi/acpi_fpdt.c new file mode > 100644 index 000000000000..b8108117262a > --- /dev/null > +++ b/drivers/acpi/acpi_fpdt.c > @@ -0,0 +1,263 @@ > +// 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; > +} > + > +void 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; > + > + fpdt_kobj = kobject_create_and_add("fpdt", acpi_kobj); > + if (!fpdt_kobj) > + return; > + > + 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); > + return; > + } > + offset += sizeof(*subtable); > + } > +} > + > +fs_initcall(acpi_init_fpdt); > -- > 2.17.1
On Fri, Jan 15, 2021 at 10:51 AM Zhang Rui <rui.zhang@intel.com> wrote: > > ACPI Firmware Performance Data Table (FPDT) provides information about > firmware performance during system boot, S3 suspend and S3 resume. > > Have the kernel parse the FPDT table, and expose the firmware > performance data to userspace as sysfs attributes under > /sys/firmware/acpi/fpdt/. > > Tested-by: Todd Brandt <todd.e.brandt@linux.intel.com> > Signed-off-by: Zhang Rui <rui.zhang@intel.com> Applied as 5.12 material with a minor adjustment of the Kconfig entry, thanks! > --- > Documentation/ABI/testing/sysfs-firmware-acpi | 43 +++ > drivers/acpi/Kconfig | 8 + > drivers/acpi/Makefile | 1 + > drivers/acpi/acpi_fpdt.c | 263 ++++++++++++++++++ > 4 files changed, 315 insertions(+) > create mode 100644 drivers/acpi/acpi_fpdt.c > > diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi > index b16d30a71709..819939d858c9 100644 > --- a/Documentation/ABI/testing/sysfs-firmware-acpi > +++ b/Documentation/ABI/testing/sysfs-firmware-acpi > @@ -1,3 +1,46 @@ > +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> > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > index ebcf534514be..84930fa2dc32 100644 > --- a/drivers/acpi/Kconfig > +++ b/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)" > + 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 > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index 076894a3330f..eb93bb7b6479 100644 > --- a/drivers/acpi/Makefile > +++ b/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 > diff --git a/drivers/acpi/acpi_fpdt.c b/drivers/acpi/acpi_fpdt.c > new file mode 100644 > index 000000000000..b8108117262a > --- /dev/null > +++ b/drivers/acpi/acpi_fpdt.c > @@ -0,0 +1,263 @@ > +// 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; > +} > + > +void 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; > + > + fpdt_kobj = kobject_create_and_add("fpdt", acpi_kobj); > + if (!fpdt_kobj) > + return; > + > + 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); > + return; > + } > + offset += sizeof(*subtable); > + } > +} > + > +fs_initcall(acpi_init_fpdt); > -- > 2.17.1 >
diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi index b16d30a71709..819939d858c9 100644 --- a/Documentation/ABI/testing/sysfs-firmware-acpi +++ b/Documentation/ABI/testing/sysfs-firmware-acpi @@ -1,3 +1,46 @@ +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> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index ebcf534514be..84930fa2dc32 100644 --- a/drivers/acpi/Kconfig +++ b/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)" + 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 diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 076894a3330f..eb93bb7b6479 100644 --- a/drivers/acpi/Makefile +++ b/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 diff --git a/drivers/acpi/acpi_fpdt.c b/drivers/acpi/acpi_fpdt.c new file mode 100644 index 000000000000..b8108117262a --- /dev/null +++ b/drivers/acpi/acpi_fpdt.c @@ -0,0 +1,263 @@ +// 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; +} + +void 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; + + fpdt_kobj = kobject_create_and_add("fpdt", acpi_kobj); + if (!fpdt_kobj) + return; + + 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); + return; + } + offset += sizeof(*subtable); + } +} + +fs_initcall(acpi_init_fpdt);