| /* |
| * 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 <asm/uaccess.h> |
| |
| MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>"); |
| MODULE_DESCRIPTION("/proc interface to IA-64 SAL features"); |
| MODULE_LICENSE("GPL"); |
| |
| static const struct file_operations proc_salinfo_fops; |
| |
| 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 */ |
| struct semaphore mutex; |
| 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; |
| int ret; |
| }; |
| |
| /* Kick the mutex that tells user space that there is work to do. Instead of |
| * trying to track the state of the mutex across multiple cpus, in user |
| * context, interrupt context, non-maskable interrupt context and hotplug cpu, |
| * it is far easier just to grab the mutex if it is free then release it. |
| * |
| * This routine must be called with data_saved_lock held, to make the down/up |
| * operation atomic. |
| */ |
| static void |
| salinfo_work_to_do(struct salinfo_data *data) |
| { |
| (void)(down_trylock(&data->mutex) ?: 0); |
| up(&data->mutex); |
| } |
| |
| static void |
| salinfo_platform_oemdata_cpu(void *context) |
| { |
| struct salinfo_platform_oemdata_parms *parms = context; |
| parms->ret = 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; |
| } |
| } |
| cpu_set(smp_processor_id(), data->cpu_event); |
| if (irqsafe) { |
| salinfo_work_to_do(data); |
| 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) |
| { |
| unsigned long flags; |
| if (!data->open) |
| return; |
| if (!cpus_empty(data->cpu_event)) { |
| spin_lock_irqsave(&data_saved_lock, flags); |
| salinfo_work_to_do(data); |
| spin_unlock_irqrestore(&data_saved_lock, flags); |
| } |
| } |
| |
| static void |
| salinfo_timeout (unsigned long arg) |
| { |
| 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 (cpus_empty(data->cpu_event) && down_trylock(&data->mutex)) { |
| if (file->f_flags & O_NONBLOCK) |
| return -EAGAIN; |
| if (down_interruptible(&data->mutex)) |
| return -EINTR; |
| } |
| |
| n = data->cpu_check; |
| for (i = 0; i < nr_cpu_ids; i++) { |
| if (cpu_isset(n, data->cpu_event)) { |
| if (!cpu_online(n)) { |
| cpu_clear(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 file_operations salinfo_event_fops = { |
| .open = salinfo_event_open, |
| .read = salinfo_event_read, |
| .llseek = 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 void |
| call_on_cpu(int cpu, void (*fn)(void *), void *arg) |
| { |
| cpumask_t save_cpus_allowed = current->cpus_allowed; |
| set_cpus_allowed_ptr(current, cpumask_of(cpu)); |
| (*fn)(arg); |
| set_cpus_allowed_ptr(current, &save_cpus_allowed); |
| } |
| |
| static void |
| 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); |
| } |
| |
| 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) |
| call_on_cpu(cpu, salinfo_log_read_cpu, data); |
| if (!data->log_size) { |
| data->state = STATE_NO_DATA; |
| cpu_clear(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 void |
| salinfo_log_clear_cpu(void *context) |
| { |
| struct salinfo_data *data = context; |
| ia64_sal_clear_state_info(data->type); |
| } |
| |
| 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 (!cpu_isset(cpu, data->cpu_event)) { |
| spin_unlock_irqrestore(&data_saved_lock, flags); |
| return 0; |
| } |
| cpu_clear(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) |
| call_on_cpu(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); |
| cpu_set(cpu, data->cpu_event); |
| salinfo_work_to_do(data); |
| 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 |
| }; |
| call_on_cpu(cpu, salinfo_platform_oemdata_cpu, &parms); |
| if (parms.ret) |
| count = parms.ret; |
| } else |
| data->oemdata_size = 0; |
| } else |
| return -EINVAL; |
| |
| return count; |
| } |
| |
| static const struct file_operations salinfo_data_fops = { |
| .open = salinfo_log_open, |
| .release = salinfo_log_release, |
| .read = salinfo_log_read, |
| .write = salinfo_log_write, |
| .llseek = default_llseek, |
| }; |
| |
| static int __cpuinit |
| salinfo_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) |
| { |
| unsigned int i, cpu = (unsigned long)hcpu; |
| unsigned long flags; |
| struct salinfo_data *data; |
| switch (action) { |
| case CPU_ONLINE: |
| case CPU_ONLINE_FROZEN: |
| spin_lock_irqsave(&data_saved_lock, flags); |
| for (i = 0, data = salinfo_data; |
| i < ARRAY_SIZE(salinfo_data); |
| ++i, ++data) { |
| cpu_set(cpu, data->cpu_event); |
| salinfo_work_to_do(data); |
| } |
| spin_unlock_irqrestore(&data_saved_lock, flags); |
| break; |
| case CPU_DEAD: |
| case CPU_DEAD_FROZEN: |
| spin_lock_irqsave(&data_saved_lock, flags); |
| for (i = 0, data = salinfo_data; |
| i < ARRAY_SIZE(salinfo_data); |
| ++i, ++data) { |
| struct salinfo_data_saved *data_saved; |
| int j; |
| for (j = ARRAY_SIZE(data->data_saved) - 1, data_saved = data->data_saved + j; |
| j >= 0; |
| --j, --data_saved) { |
| if (data_saved->buffer && data_saved->cpu == cpu) { |
| shift1_data_saved(data, j); |
| } |
| } |
| cpu_clear(cpu, data->cpu_event); |
| } |
| spin_unlock_irqrestore(&data_saved_lock, flags); |
| break; |
| } |
| return NOTIFY_OK; |
| } |
| |
| static struct notifier_block salinfo_cpu_notifier __cpuinitdata = |
| { |
| .notifier_call = salinfo_cpu_callback, |
| .priority = 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, j; |
| |
| 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_data(salinfo_entries[i].name, 0, salinfo_dir, |
| &proc_salinfo_fops, |
| (void *)salinfo_entries[i].feature); |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) { |
| data = salinfo_data + i; |
| data->type = i; |
| sema_init(&data->mutex, 1); |
| dir = proc_mkdir(salinfo_log_name[i], salinfo_dir); |
| if (!dir) |
| continue; |
| |
| entry = proc_create_data("event", S_IRUSR, dir, |
| &salinfo_event_fops, data); |
| if (!entry) |
| continue; |
| *sdir++ = entry; |
| |
| entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir, |
| &salinfo_data_fops, data); |
| if (!entry) |
| continue; |
| *sdir++ = entry; |
| |
| /* we missed any events before now */ |
| for_each_online_cpu(j) |
| cpu_set(j, data->cpu_event); |
| |
| *sdir++ = dir; |
| } |
| |
| *sdir++ = salinfo_dir; |
| |
| init_timer(&salinfo_timer); |
| salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY; |
| salinfo_timer.function = &salinfo_timeout; |
| add_timer(&salinfo_timer); |
| |
| register_hotcpu_notifier(&salinfo_cpu_notifier); |
| |
| return 0; |
| } |
| |
| /* |
| * 'data' contains an integer that corresponds to the feature we're |
| * testing |
| */ |
| static int 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 proc_salinfo_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, proc_salinfo_show, PDE_DATA(inode)); |
| } |
| |
| static const struct file_operations proc_salinfo_fops = { |
| .open = proc_salinfo_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| module_init(salinfo_init); |