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![Hans de Goede](/assets/img/avatar_default.png)
On a Packard Bell Dot SC (Intel Atom N2600 model) there is a FPDT table which contains invalid physical addresses, with high bits set which fall outside the range of the CPU-s supported physical address range. Calling acpi_os_map_memory() on such an invalid phys address leads to the below WARN_ON in ioremap triggering resulting in an oops/stacktrace. Add code to verify the physical address before calling acpi_os_map_memory() to fix / avoid the oops. [ 1.226900] ioremap: invalid physical address 3001000000000000 [ 1.226949] ------------[ cut here ]------------ [ 1.226962] WARNING: CPU: 1 PID: 1 at arch/x86/mm/ioremap.c:200 __ioremap_caller.cold+0x43/0x5f [ 1.226996] Modules linked in: [ 1.227016] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.0.0-rc3+ #490 [ 1.227029] Hardware name: Packard Bell dot s/SJE01_CT, BIOS V1.10 07/23/2013 [ 1.227038] RIP: 0010:__ioremap_caller.cold+0x43/0x5f [ 1.227054] Code: 96 00 00 e9 f8 af 24 ff 89 c6 48 c7 c7 d8 0c 84 99 e8 6a 96 00 00 e9 76 af 24 ff 48 89 fe 48 c7 c7 a8 0c 84 99 e8 56 96 00 00 <0f> 0b e9 60 af 24 ff 48 8b 34 24 48 c7 c7 40 0d 84 99 e8 3f 96 00 [ 1.227067] RSP: 0000:ffffb18c40033d60 EFLAGS: 00010286 [ 1.227084] RAX: 0000000000000032 RBX: 3001000000000000 RCX: 0000000000000000 [ 1.227095] RDX: 0000000000000001 RSI: 00000000ffffdfff RDI: 00000000ffffffff [ 1.227105] RBP: 3001000000000000 R08: 0000000000000000 R09: ffffb18c40033c18 [ 1.227115] R10: 0000000000000003 R11: ffffffff99d62fe8 R12: 0000000000000008 [ 1.227124] R13: 0003001000000000 R14: 0000000000001000 R15: 3001000000000000 [ 1.227135] FS: 0000000000000000(0000) GS:ffff913a3c080000(0000) knlGS:0000000000000000 [ 1.227146] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.227156] CR2: 0000000000000000 CR3: 0000000018c26000 CR4: 00000000000006e0 [ 1.227167] Call Trace: [ 1.227176] <TASK> [ 1.227185] ? acpi_os_map_iomem+0x1c9/0x1e0 [ 1.227215] ? kmem_cache_alloc_trace+0x187/0x370 [ 1.227254] acpi_os_map_iomem+0x1c9/0x1e0 [ 1.227288] acpi_init_fpdt+0xa8/0x253 [ 1.227308] ? acpi_debugfs_init+0x1f/0x1f [ 1.227339] do_one_initcall+0x5a/0x300 [ 1.227406] ? rcu_read_lock_sched_held+0x3f/0x80 [ 1.227442] kernel_init_freeable+0x28b/0x2cc [ 1.227512] ? rest_init+0x170/0x170 [ 1.227538] kernel_init+0x16/0x140 [ 1.227552] ret_from_fork+0x1f/0x30 [ 1.227639] </TASK> [ 1.227647] irq event stamp: 186819 [ 1.227656] hardirqs last enabled at (186825): [<ffffffff98184a6e>] __up_console_sem+0x5e/0x70 [ 1.227672] hardirqs last disabled at (186830): [<ffffffff98184a53>] __up_console_sem+0x43/0x70 [ 1.227686] softirqs last enabled at (186576): [<ffffffff980fbc9d>] __irq_exit_rcu+0xed/0x160 [ 1.227701] softirqs last disabled at (186569): [<ffffffff980fbc9d>] __irq_exit_rcu+0xed/0x160 [ 1.227715] ---[ end trace 0000000000000000 ]--- Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
287 lines
7 KiB
C
287 lines
7 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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#if defined CONFIG_X86 && defined CONFIG_PHYS_ADDR_T_64BIT
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#include <linux/processor.h>
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static bool fpdt_address_valid(u64 address)
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{
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/*
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* On some systems the table contains invalid addresses
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* with unsuppored high address bits set, check for this.
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*/
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return !(address >> boot_cpu_data.x86_phys_bits);
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}
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#else
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static bool fpdt_address_valid(u64 address)
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{
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return true;
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}
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#endif
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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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if (!fpdt_address_valid(address)) {
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pr_info(FW_BUG "invalid physical address: 0x%llx!\n", address);
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return -EINVAL;
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}
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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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