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-rw-r--r--arch/ia64/kernel/salinfo.c646
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diff --git a/arch/ia64/kernel/salinfo.c b/arch/ia64/kernel/salinfo.c
deleted file mode 100644
index 03b632c568..0000000000
--- a/arch/ia64/kernel/salinfo.c
+++ /dev/null
@@ -1,646 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * salinfo.c
- *
- * Creates entries in /proc/sal for various system features.
- *
- * Copyright (c) 2003, 2006 Silicon Graphics, Inc. All rights reserved.
- * Copyright (c) 2003 Hewlett-Packard Co
- * Bjorn Helgaas <bjorn.helgaas@hp.com>
- *
- * 10/30/2001 jbarnes@sgi.com copied much of Stephane's palinfo
- * code to create this file
- * Oct 23 2003 kaos@sgi.com
- * Replace IPI with set_cpus_allowed() to read a record from the required cpu.
- * Redesign salinfo log processing to separate interrupt and user space
- * contexts.
- * Cache the record across multi-block reads from user space.
- * Support > 64 cpus.
- * Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module.
- *
- * Jan 28 2004 kaos@sgi.com
- * Periodically check for outstanding MCA or INIT records.
- *
- * Dec 5 2004 kaos@sgi.com
- * Standardize which records are cleared automatically.
- *
- * Aug 18 2005 kaos@sgi.com
- * mca.c may not pass a buffer, a NULL buffer just indicates that a new
- * record is available in SAL.
- * Replace some NR_CPUS by cpus_online, for hotplug cpu.
- *
- * Jan 5 2006 kaos@sgi.com
- * Handle hotplug cpus coming online.
- * Handle hotplug cpus going offline while they still have outstanding records.
- * Use the cpu_* macros consistently.
- * Replace the counting semaphore with a mutex and a test if the cpumask is non-empty.
- * Modify the locking to make the test for "work to do" an atomic operation.
- */
-
-#include <linux/capability.h>
-#include <linux/cpu.h>
-#include <linux/types.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/module.h>
-#include <linux/smp.h>
-#include <linux/timer.h>
-#include <linux/vmalloc.h>
-#include <linux/semaphore.h>
-
-#include <asm/sal.h>
-#include <linux/uaccess.h>
-
-MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
-MODULE_DESCRIPTION("/proc interface to IA-64 SAL features");
-MODULE_LICENSE("GPL");
-
-typedef struct {
- const char *name; /* name of the proc entry */
- unsigned long feature; /* feature bit */
- struct proc_dir_entry *entry; /* registered entry (removal) */
-} salinfo_entry_t;
-
-/*
- * List {name,feature} pairs for every entry in /proc/sal/<feature>
- * that this module exports
- */
-static const salinfo_entry_t salinfo_entries[]={
- { "bus_lock", IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, },
- { "irq_redirection", IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, },
- { "ipi_redirection", IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, },
- { "itc_drift", IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, },
-};
-
-#define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries)
-
-static char *salinfo_log_name[] = {
- "mca",
- "init",
- "cmc",
- "cpe",
-};
-
-static struct proc_dir_entry *salinfo_proc_entries[
- ARRAY_SIZE(salinfo_entries) + /* /proc/sal/bus_lock */
- ARRAY_SIZE(salinfo_log_name) + /* /proc/sal/{mca,...} */
- (2 * ARRAY_SIZE(salinfo_log_name)) + /* /proc/sal/mca/{event,data} */
- 1]; /* /proc/sal */
-
-/* Some records we get ourselves, some are accessed as saved data in buffers
- * that are owned by mca.c.
- */
-struct salinfo_data_saved {
- u8* buffer;
- u64 size;
- u64 id;
- int cpu;
-};
-
-/* State transitions. Actions are :-
- * Write "read <cpunum>" to the data file.
- * Write "clear <cpunum>" to the data file.
- * Write "oemdata <cpunum> <offset> to the data file.
- * Read from the data file.
- * Close the data file.
- *
- * Start state is NO_DATA.
- *
- * NO_DATA
- * write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- * write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- * write "oemdata <cpunum> <offset> -> return -EINVAL.
- * read data -> return EOF.
- * close -> unchanged. Free record areas.
- *
- * LOG_RECORD
- * write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- * write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- * write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
- * read data -> return the INIT/MCA/CMC/CPE record.
- * close -> unchanged. Keep record areas.
- *
- * OEMDATA
- * write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- * write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- * write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
- * read data -> return the formatted oemdata.
- * close -> unchanged. Keep record areas.
- *
- * Closing the data file does not change the state. This allows shell scripts
- * to manipulate salinfo data, each shell redirection opens the file, does one
- * action then closes it again. The record areas are only freed at close when
- * the state is NO_DATA.
- */
-enum salinfo_state {
- STATE_NO_DATA,
- STATE_LOG_RECORD,
- STATE_OEMDATA,
-};
-
-struct salinfo_data {
- cpumask_t cpu_event; /* which cpus have outstanding events */
- wait_queue_head_t read_wait;
- u8 *log_buffer;
- u64 log_size;
- u8 *oemdata; /* decoded oem data */
- u64 oemdata_size;
- int open; /* single-open to prevent races */
- u8 type;
- u8 saved_num; /* using a saved record? */
- enum salinfo_state state :8; /* processing state */
- u8 padding;
- int cpu_check; /* next CPU to check */
- struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */
-};
-
-static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)];
-
-static DEFINE_SPINLOCK(data_lock);
-static DEFINE_SPINLOCK(data_saved_lock);
-
-/** salinfo_platform_oemdata - optional callback to decode oemdata from an error
- * record.
- * @sect_header: pointer to the start of the section to decode.
- * @oemdata: returns vmalloc area containing the decoded output.
- * @oemdata_size: returns length of decoded output (strlen).
- *
- * Description: If user space asks for oem data to be decoded by the kernel
- * and/or prom and the platform has set salinfo_platform_oemdata to the address
- * of a platform specific routine then call that routine. salinfo_platform_oemdata
- * vmalloc's and formats its output area, returning the address of the text
- * and its strlen. Returns 0 for success, -ve for error. The callback is
- * invoked on the cpu that generated the error record.
- */
-int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size);
-
-struct salinfo_platform_oemdata_parms {
- const u8 *efi_guid;
- u8 **oemdata;
- u64 *oemdata_size;
-};
-
-static long
-salinfo_platform_oemdata_cpu(void *context)
-{
- struct salinfo_platform_oemdata_parms *parms = context;
-
- return salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
-}
-
-static void
-shift1_data_saved (struct salinfo_data *data, int shift)
-{
- memcpy(data->data_saved+shift, data->data_saved+shift+1,
- (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0]));
- memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0,
- sizeof(data->data_saved[0]));
-}
-
-/* This routine is invoked in interrupt context. Note: mca.c enables
- * interrupts before calling this code for CMC/CPE. MCA and INIT events are
- * not irq safe, do not call any routines that use spinlocks, they may deadlock.
- * MCA and INIT records are recorded, a timer event will look for any
- * outstanding events and wake up the user space code.
- *
- * The buffer passed from mca.c points to the output from ia64_log_get. This is
- * a persistent buffer but its contents can change between the interrupt and
- * when user space processes the record. Save the record id to identify
- * changes. If the buffer is NULL then just update the bitmap.
- */
-void
-salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
-{
- struct salinfo_data *data = salinfo_data + type;
- struct salinfo_data_saved *data_saved;
- unsigned long flags = 0;
- int i;
- int saved_size = ARRAY_SIZE(data->data_saved);
-
- BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
-
- if (irqsafe)
- spin_lock_irqsave(&data_saved_lock, flags);
- if (buffer) {
- for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
- if (!data_saved->buffer)
- break;
- }
- if (i == saved_size) {
- if (!data->saved_num) {
- shift1_data_saved(data, 0);
- data_saved = data->data_saved + saved_size - 1;
- } else
- data_saved = NULL;
- }
- if (data_saved) {
- data_saved->cpu = smp_processor_id();
- data_saved->id = ((sal_log_record_header_t *)buffer)->id;
- data_saved->size = size;
- data_saved->buffer = buffer;
- }
- }
- cpumask_set_cpu(smp_processor_id(), &data->cpu_event);
- if (irqsafe) {
- wake_up_interruptible(&data->read_wait);
- spin_unlock_irqrestore(&data_saved_lock, flags);
- }
-}
-
-/* Check for outstanding MCA/INIT records every minute (arbitrary) */
-#define SALINFO_TIMER_DELAY (60*HZ)
-static struct timer_list salinfo_timer;
-extern void ia64_mlogbuf_dump(void);
-
-static void
-salinfo_timeout_check(struct salinfo_data *data)
-{
- if (!data->open)
- return;
- if (!cpumask_empty(&data->cpu_event))
- wake_up_interruptible(&data->read_wait);
-}
-
-static void
-salinfo_timeout(struct timer_list *unused)
-{
- ia64_mlogbuf_dump();
- salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA);
- salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT);
- salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
- add_timer(&salinfo_timer);
-}
-
-static int
-salinfo_event_open(struct inode *inode, struct file *file)
-{
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- return 0;
-}
-
-static ssize_t
-salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
-{
- struct salinfo_data *data = pde_data(file_inode(file));
- char cmd[32];
- size_t size;
- int i, n, cpu = -1;
-
-retry:
- if (cpumask_empty(&data->cpu_event)) {
- if (file->f_flags & O_NONBLOCK)
- return -EAGAIN;
- if (wait_event_interruptible(data->read_wait,
- !cpumask_empty(&data->cpu_event)))
- return -EINTR;
- }
-
- n = data->cpu_check;
- for (i = 0; i < nr_cpu_ids; i++) {
- if (cpumask_test_cpu(n, &data->cpu_event)) {
- if (!cpu_online(n)) {
- cpumask_clear_cpu(n, &data->cpu_event);
- continue;
- }
- cpu = n;
- break;
- }
- if (++n == nr_cpu_ids)
- n = 0;
- }
-
- if (cpu == -1)
- goto retry;
-
- ia64_mlogbuf_dump();
-
- /* for next read, start checking at next CPU */
- data->cpu_check = cpu;
- if (++data->cpu_check == nr_cpu_ids)
- data->cpu_check = 0;
-
- snprintf(cmd, sizeof(cmd), "read %d\n", cpu);
-
- size = strlen(cmd);
- if (size > count)
- size = count;
- if (copy_to_user(buffer, cmd, size))
- return -EFAULT;
-
- return size;
-}
-
-static const struct proc_ops salinfo_event_proc_ops = {
- .proc_open = salinfo_event_open,
- .proc_read = salinfo_event_read,
- .proc_lseek = noop_llseek,
-};
-
-static int
-salinfo_log_open(struct inode *inode, struct file *file)
-{
- struct salinfo_data *data = pde_data(inode);
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- spin_lock(&data_lock);
- if (data->open) {
- spin_unlock(&data_lock);
- return -EBUSY;
- }
- data->open = 1;
- spin_unlock(&data_lock);
-
- if (data->state == STATE_NO_DATA &&
- !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) {
- data->open = 0;
- return -ENOMEM;
- }
-
- return 0;
-}
-
-static int
-salinfo_log_release(struct inode *inode, struct file *file)
-{
- struct salinfo_data *data = pde_data(inode);
-
- if (data->state == STATE_NO_DATA) {
- vfree(data->log_buffer);
- vfree(data->oemdata);
- data->log_buffer = NULL;
- data->oemdata = NULL;
- }
- spin_lock(&data_lock);
- data->open = 0;
- spin_unlock(&data_lock);
- return 0;
-}
-
-static long
-salinfo_log_read_cpu(void *context)
-{
- struct salinfo_data *data = context;
- sal_log_record_header_t *rh;
- data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer);
- rh = (sal_log_record_header_t *)(data->log_buffer);
- /* Clear corrected errors as they are read from SAL */
- if (rh->severity == sal_log_severity_corrected)
- ia64_sal_clear_state_info(data->type);
- return 0;
-}
-
-static void
-salinfo_log_new_read(int cpu, struct salinfo_data *data)
-{
- struct salinfo_data_saved *data_saved;
- unsigned long flags;
- int i;
- int saved_size = ARRAY_SIZE(data->data_saved);
-
- data->saved_num = 0;
- spin_lock_irqsave(&data_saved_lock, flags);
-retry:
- for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
- if (data_saved->buffer && data_saved->cpu == cpu) {
- sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer);
- data->log_size = data_saved->size;
- memcpy(data->log_buffer, rh, data->log_size);
- barrier(); /* id check must not be moved */
- if (rh->id == data_saved->id) {
- data->saved_num = i+1;
- break;
- }
- /* saved record changed by mca.c since interrupt, discard it */
- shift1_data_saved(data, i);
- goto retry;
- }
- }
- spin_unlock_irqrestore(&data_saved_lock, flags);
-
- if (!data->saved_num)
- work_on_cpu_safe(cpu, salinfo_log_read_cpu, data);
- if (!data->log_size) {
- data->state = STATE_NO_DATA;
- cpumask_clear_cpu(cpu, &data->cpu_event);
- } else {
- data->state = STATE_LOG_RECORD;
- }
-}
-
-static ssize_t
-salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
-{
- struct salinfo_data *data = pde_data(file_inode(file));
- u8 *buf;
- u64 bufsize;
-
- if (data->state == STATE_LOG_RECORD) {
- buf = data->log_buffer;
- bufsize = data->log_size;
- } else if (data->state == STATE_OEMDATA) {
- buf = data->oemdata;
- bufsize = data->oemdata_size;
- } else {
- buf = NULL;
- bufsize = 0;
- }
- return simple_read_from_buffer(buffer, count, ppos, buf, bufsize);
-}
-
-static long
-salinfo_log_clear_cpu(void *context)
-{
- struct salinfo_data *data = context;
-
- ia64_sal_clear_state_info(data->type);
- return 0;
-}
-
-static int
-salinfo_log_clear(struct salinfo_data *data, int cpu)
-{
- sal_log_record_header_t *rh;
- unsigned long flags;
- spin_lock_irqsave(&data_saved_lock, flags);
- data->state = STATE_NO_DATA;
- if (!cpumask_test_cpu(cpu, &data->cpu_event)) {
- spin_unlock_irqrestore(&data_saved_lock, flags);
- return 0;
- }
- cpumask_clear_cpu(cpu, &data->cpu_event);
- if (data->saved_num) {
- shift1_data_saved(data, data->saved_num - 1);
- data->saved_num = 0;
- }
- spin_unlock_irqrestore(&data_saved_lock, flags);
- rh = (sal_log_record_header_t *)(data->log_buffer);
- /* Corrected errors have already been cleared from SAL */
- if (rh->severity != sal_log_severity_corrected)
- work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
- /* clearing a record may make a new record visible */
- salinfo_log_new_read(cpu, data);
- if (data->state == STATE_LOG_RECORD) {
- spin_lock_irqsave(&data_saved_lock, flags);
- cpumask_set_cpu(cpu, &data->cpu_event);
- wake_up_interruptible(&data->read_wait);
- spin_unlock_irqrestore(&data_saved_lock, flags);
- }
- return 0;
-}
-
-static ssize_t
-salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
-{
- struct salinfo_data *data = pde_data(file_inode(file));
- char cmd[32];
- size_t size;
- u32 offset;
- int cpu;
-
- size = sizeof(cmd);
- if (count < size)
- size = count;
- if (copy_from_user(cmd, buffer, size))
- return -EFAULT;
-
- if (sscanf(cmd, "read %d", &cpu) == 1) {
- salinfo_log_new_read(cpu, data);
- } else if (sscanf(cmd, "clear %d", &cpu) == 1) {
- int ret;
- if ((ret = salinfo_log_clear(data, cpu)))
- count = ret;
- } else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) {
- if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA)
- return -EINVAL;
- if (offset > data->log_size - sizeof(efi_guid_t))
- return -EINVAL;
- data->state = STATE_OEMDATA;
- if (salinfo_platform_oemdata) {
- struct salinfo_platform_oemdata_parms parms = {
- .efi_guid = data->log_buffer + offset,
- .oemdata = &data->oemdata,
- .oemdata_size = &data->oemdata_size
- };
- count = work_on_cpu_safe(cpu, salinfo_platform_oemdata_cpu,
- &parms);
- } else
- data->oemdata_size = 0;
- } else
- return -EINVAL;
-
- return count;
-}
-
-static const struct proc_ops salinfo_data_proc_ops = {
- .proc_open = salinfo_log_open,
- .proc_release = salinfo_log_release,
- .proc_read = salinfo_log_read,
- .proc_write = salinfo_log_write,
- .proc_lseek = default_llseek,
-};
-
-static int salinfo_cpu_online(unsigned int cpu)
-{
- unsigned int i, end = ARRAY_SIZE(salinfo_data);
- struct salinfo_data *data;
-
- spin_lock_irq(&data_saved_lock);
- for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
- cpumask_set_cpu(cpu, &data->cpu_event);
- wake_up_interruptible(&data->read_wait);
- }
- spin_unlock_irq(&data_saved_lock);
- return 0;
-}
-
-static int salinfo_cpu_pre_down(unsigned int cpu)
-{
- unsigned int i, end = ARRAY_SIZE(salinfo_data);
- struct salinfo_data *data;
-
- spin_lock_irq(&data_saved_lock);
- for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
- struct salinfo_data_saved *data_saved;
- int j = ARRAY_SIZE(data->data_saved) - 1;
-
- for (data_saved = data->data_saved + j; j >= 0;
- --j, --data_saved) {
- if (data_saved->buffer && data_saved->cpu == cpu)
- shift1_data_saved(data, j);
- }
- cpumask_clear_cpu(cpu, &data->cpu_event);
- }
- spin_unlock_irq(&data_saved_lock);
- return 0;
-}
-
-/*
- * 'data' contains an integer that corresponds to the feature we're
- * testing
- */
-static int __maybe_unused proc_salinfo_show(struct seq_file *m, void *v)
-{
- unsigned long data = (unsigned long)v;
- seq_puts(m, (sal_platform_features & data) ? "1\n" : "0\n");
- return 0;
-}
-
-static int __init
-salinfo_init(void)
-{
- struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */
- struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */
- struct proc_dir_entry *dir, *entry;
- struct salinfo_data *data;
- int i;
-
- salinfo_dir = proc_mkdir("sal", NULL);
- if (!salinfo_dir)
- return 0;
-
- for (i=0; i < NR_SALINFO_ENTRIES; i++) {
- /* pass the feature bit in question as misc data */
- *sdir++ = proc_create_single_data(salinfo_entries[i].name, 0,
- salinfo_dir, proc_salinfo_show,
- (void *)salinfo_entries[i].feature);
- }
-
- for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
- data = salinfo_data + i;
- data->type = i;
- init_waitqueue_head(&data->read_wait);
- dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
- if (!dir)
- continue;
-
- entry = proc_create_data("event", S_IRUSR, dir,
- &salinfo_event_proc_ops, data);
- if (!entry)
- continue;
- *sdir++ = entry;
-
- entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir,
- &salinfo_data_proc_ops, data);
- if (!entry)
- continue;
- *sdir++ = entry;
-
- *sdir++ = dir;
- }
-
- *sdir++ = salinfo_dir;
-
- timer_setup(&salinfo_timer, salinfo_timeout, 0);
- salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
- add_timer(&salinfo_timer);
-
- i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/salinfo:online",
- salinfo_cpu_online, salinfo_cpu_pre_down);
- WARN_ON(i < 0);
- return 0;
-}
-
-module_init(salinfo_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 19:49:06 +0000