630 lines
17 KiB
C
630 lines
17 KiB
C
![]() |
/*
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* salinfo.c
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*
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* Creates entries in /proc/sal for various system features.
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*
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* Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
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* Copyright (c) 2003 Hewlett-Packard Co
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*
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* 10/30/2001 jbarnes@sgi.com copied much of Stephane's palinfo
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* code to create this file
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* Oct 23 2003 kaos@sgi.com
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* Replace IPI with set_cpus_allowed() to read a record from the required cpu.
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* Redesign salinfo log processing to separate interrupt and user space
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* contexts.
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* Cache the record across multi-block reads from user space.
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* Support > 64 cpus.
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* Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module.
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*
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* Jan 28 2004 kaos@sgi.com
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* Periodically check for outstanding MCA or INIT records.
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*
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* Dec 5 2004 kaos@sgi.com
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* Standardize which records are cleared automatically.
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*/
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/module.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/timer.h>
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#include <linux/vmalloc.h>
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#include <asm/semaphore.h>
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#include <asm/sal.h>
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#include <asm/uaccess.h>
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MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
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MODULE_DESCRIPTION("/proc interface to IA-64 SAL features");
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MODULE_LICENSE("GPL");
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static int salinfo_read(char *page, char **start, off_t off, int count, int *eof, void *data);
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typedef struct {
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const char *name; /* name of the proc entry */
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unsigned long feature; /* feature bit */
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struct proc_dir_entry *entry; /* registered entry (removal) */
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} salinfo_entry_t;
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/*
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* List {name,feature} pairs for every entry in /proc/sal/<feature>
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* that this module exports
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*/
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static salinfo_entry_t salinfo_entries[]={
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{ "bus_lock", IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, },
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{ "irq_redirection", IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, },
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{ "ipi_redirection", IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, },
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{ "itc_drift", IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, },
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};
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#define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries)
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static char *salinfo_log_name[] = {
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"mca",
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"init",
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"cmc",
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"cpe",
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};
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static struct proc_dir_entry *salinfo_proc_entries[
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ARRAY_SIZE(salinfo_entries) + /* /proc/sal/bus_lock */
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ARRAY_SIZE(salinfo_log_name) + /* /proc/sal/{mca,...} */
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(2 * ARRAY_SIZE(salinfo_log_name)) + /* /proc/sal/mca/{event,data} */
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1]; /* /proc/sal */
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/* Some records we get ourselves, some are accessed as saved data in buffers
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* that are owned by mca.c.
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*/
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struct salinfo_data_saved {
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u8* buffer;
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u64 size;
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u64 id;
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int cpu;
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};
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/* State transitions. Actions are :-
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* Write "read <cpunum>" to the data file.
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* Write "clear <cpunum>" to the data file.
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* Write "oemdata <cpunum> <offset> to the data file.
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* Read from the data file.
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* Close the data file.
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*
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* Start state is NO_DATA.
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*
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* NO_DATA
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* write "read <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "oemdata <cpunum> <offset> -> return -EINVAL.
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* read data -> return EOF.
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* close -> unchanged. Free record areas.
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*
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* LOG_RECORD
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* write "read <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
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* read data -> return the INIT/MCA/CMC/CPE record.
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* close -> unchanged. Keep record areas.
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*
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* OEMDATA
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* write "read <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
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* read data -> return the formatted oemdata.
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* close -> unchanged. Keep record areas.
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*
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* Closing the data file does not change the state. This allows shell scripts
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* to manipulate salinfo data, each shell redirection opens the file, does one
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* action then closes it again. The record areas are only freed at close when
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* the state is NO_DATA.
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*/
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enum salinfo_state {
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STATE_NO_DATA,
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STATE_LOG_RECORD,
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STATE_OEMDATA,
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};
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struct salinfo_data {
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volatile cpumask_t cpu_event; /* which cpus have outstanding events */
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struct semaphore sem; /* count of cpus with outstanding events (bits set in cpu_event) */
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u8 *log_buffer;
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u64 log_size;
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u8 *oemdata; /* decoded oem data */
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u64 oemdata_size;
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int open; /* single-open to prevent races */
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u8 type;
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u8 saved_num; /* using a saved record? */
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enum salinfo_state state :8; /* processing state */
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u8 padding;
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int cpu_check; /* next CPU to check */
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struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */
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};
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static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)];
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static spinlock_t data_lock, data_saved_lock;
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/** salinfo_platform_oemdata - optional callback to decode oemdata from an error
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* record.
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* @sect_header: pointer to the start of the section to decode.
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* @oemdata: returns vmalloc area containing the decded output.
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* @oemdata_size: returns length of decoded output (strlen).
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*
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* Description: If user space asks for oem data to be decoded by the kernel
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* and/or prom and the platform has set salinfo_platform_oemdata to the address
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* of a platform specific routine then call that routine. salinfo_platform_oemdata
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* vmalloc's and formats its output area, returning the address of the text
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* and its strlen. Returns 0 for success, -ve for error. The callback is
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* invoked on the cpu that generated the error record.
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*/
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int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size);
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struct salinfo_platform_oemdata_parms {
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const u8 *efi_guid;
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u8 **oemdata;
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u64 *oemdata_size;
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int ret;
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};
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static void
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salinfo_platform_oemdata_cpu(void *context)
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{
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struct salinfo_platform_oemdata_parms *parms = context;
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parms->ret = salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
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}
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static void
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shift1_data_saved (struct salinfo_data *data, int shift)
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{
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memcpy(data->data_saved+shift, data->data_saved+shift+1,
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(ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0]));
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memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0,
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sizeof(data->data_saved[0]));
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}
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/* This routine is invoked in interrupt context. Note: mca.c enables
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* interrupts before calling this code for CMC/CPE. MCA and INIT events are
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* not irq safe, do not call any routines that use spinlocks, they may deadlock.
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* MCA and INIT records are recorded, a timer event will look for any
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* outstanding events and wake up the user space code.
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*
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* The buffer passed from mca.c points to the output from ia64_log_get. This is
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* a persistent buffer but its contents can change between the interrupt and
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* when user space processes the record. Save the record id to identify
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* changes.
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*/
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void
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salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
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{
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struct salinfo_data *data = salinfo_data + type;
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struct salinfo_data_saved *data_saved;
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unsigned long flags = 0;
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int i;
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int saved_size = ARRAY_SIZE(data->data_saved);
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BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
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if (irqsafe)
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spin_lock_irqsave(&data_saved_lock, flags);
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for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
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if (!data_saved->buffer)
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break;
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}
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if (i == saved_size) {
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if (!data->saved_num) {
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shift1_data_saved(data, 0);
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data_saved = data->data_saved + saved_size - 1;
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} else
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data_saved = NULL;
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}
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if (data_saved) {
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data_saved->cpu = smp_processor_id();
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data_saved->id = ((sal_log_record_header_t *)buffer)->id;
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data_saved->size = size;
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data_saved->buffer = buffer;
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}
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if (irqsafe)
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spin_unlock_irqrestore(&data_saved_lock, flags);
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if (!test_and_set_bit(smp_processor_id(), &data->cpu_event)) {
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if (irqsafe)
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up(&data->sem);
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}
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}
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/* Check for outstanding MCA/INIT records every minute (arbitrary) */
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#define SALINFO_TIMER_DELAY (60*HZ)
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static struct timer_list salinfo_timer;
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static void
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salinfo_timeout_check(struct salinfo_data *data)
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{
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int i;
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if (!data->open)
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return;
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for (i = 0; i < NR_CPUS; ++i) {
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if (test_bit(i, &data->cpu_event)) {
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/* double up() is not a problem, user space will see no
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* records for the additional "events".
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*/
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up(&data->sem);
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}
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}
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}
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static void
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salinfo_timeout (unsigned long arg)
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{
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salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA);
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salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT);
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salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
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add_timer(&salinfo_timer);
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}
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static int
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salinfo_event_open(struct inode *inode, struct file *file)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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return 0;
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}
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static ssize_t
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salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
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{
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struct inode *inode = file->f_dentry->d_inode;
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struct proc_dir_entry *entry = PDE(inode);
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struct salinfo_data *data = entry->data;
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char cmd[32];
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size_t size;
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int i, n, cpu = -1;
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retry:
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if (down_trylock(&data->sem)) {
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if (file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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if (down_interruptible(&data->sem))
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return -ERESTARTSYS;
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}
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n = data->cpu_check;
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for (i = 0; i < NR_CPUS; i++) {
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if (test_bit(n, &data->cpu_event)) {
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cpu = n;
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break;
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}
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if (++n == NR_CPUS)
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n = 0;
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}
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if (cpu == -1)
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goto retry;
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/* events are sticky until the user says "clear" */
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up(&data->sem);
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/* for next read, start checking at next CPU */
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data->cpu_check = cpu;
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if (++data->cpu_check == NR_CPUS)
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data->cpu_check = 0;
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snprintf(cmd, sizeof(cmd), "read %d\n", cpu);
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size = strlen(cmd);
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if (size > count)
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size = count;
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if (copy_to_user(buffer, cmd, size))
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return -EFAULT;
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return size;
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}
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static struct file_operations salinfo_event_fops = {
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.open = salinfo_event_open,
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.read = salinfo_event_read,
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};
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static int
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salinfo_log_open(struct inode *inode, struct file *file)
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{
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struct proc_dir_entry *entry = PDE(inode);
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struct salinfo_data *data = entry->data;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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spin_lock(&data_lock);
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if (data->open) {
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spin_unlock(&data_lock);
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return -EBUSY;
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}
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data->open = 1;
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spin_unlock(&data_lock);
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if (data->state == STATE_NO_DATA &&
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!(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) {
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data->open = 0;
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return -ENOMEM;
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}
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return 0;
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}
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static int
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salinfo_log_release(struct inode *inode, struct file *file)
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{
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struct proc_dir_entry *entry = PDE(inode);
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struct salinfo_data *data = entry->data;
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if (data->state == STATE_NO_DATA) {
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vfree(data->log_buffer);
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vfree(data->oemdata);
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data->log_buffer = NULL;
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data->oemdata = NULL;
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}
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spin_lock(&data_lock);
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data->open = 0;
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spin_unlock(&data_lock);
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return 0;
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}
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static void
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call_on_cpu(int cpu, void (*fn)(void *), void *arg)
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{
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cpumask_t save_cpus_allowed, new_cpus_allowed;
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memcpy(&save_cpus_allowed, ¤t->cpus_allowed, sizeof(save_cpus_allowed));
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memset(&new_cpus_allowed, 0, sizeof(new_cpus_allowed));
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set_bit(cpu, &new_cpus_allowed);
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set_cpus_allowed(current, new_cpus_allowed);
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(*fn)(arg);
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set_cpus_allowed(current, save_cpus_allowed);
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}
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static void
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salinfo_log_read_cpu(void *context)
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{
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struct salinfo_data *data = context;
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sal_log_record_header_t *rh;
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data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer);
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rh = (sal_log_record_header_t *)(data->log_buffer);
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/* Clear corrected errors as they are read from SAL */
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if (rh->severity == sal_log_severity_corrected)
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ia64_sal_clear_state_info(data->type);
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}
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static void
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salinfo_log_new_read(int cpu, struct salinfo_data *data)
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{
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struct salinfo_data_saved *data_saved;
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unsigned long flags;
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int i;
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int saved_size = ARRAY_SIZE(data->data_saved);
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data->saved_num = 0;
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spin_lock_irqsave(&data_saved_lock, flags);
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retry:
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for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
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if (data_saved->buffer && data_saved->cpu == cpu) {
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sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer);
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data->log_size = data_saved->size;
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memcpy(data->log_buffer, rh, data->log_size);
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barrier(); /* id check must not be moved */
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|
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;
|
||
|
clear_bit(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 inode *inode = file->f_dentry->d_inode;
|
||
|
struct proc_dir_entry *entry = PDE(inode);
|
||
|
struct salinfo_data *data = entry->data;
|
||
|
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;
|
||
|
data->state = STATE_NO_DATA;
|
||
|
if (!test_bit(cpu, &data->cpu_event))
|
||
|
return 0;
|
||
|
down(&data->sem);
|
||
|
clear_bit(cpu, &data->cpu_event);
|
||
|
if (data->saved_num) {
|
||
|
unsigned long flags;
|
||
|
spin_lock_irqsave(&data_saved_lock, flags);
|
||
|
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 &&
|
||
|
!test_and_set_bit(cpu, &data->cpu_event))
|
||
|
up(&data->sem);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static ssize_t
|
||
|
salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
|
||
|
{
|
||
|
struct inode *inode = file->f_dentry->d_inode;
|
||
|
struct proc_dir_entry *entry = PDE(inode);
|
||
|
struct salinfo_data *data = entry->data;
|
||
|
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 struct file_operations salinfo_data_fops = {
|
||
|
.open = salinfo_log_open,
|
||
|
.release = salinfo_log_release,
|
||
|
.read = salinfo_log_read,
|
||
|
.write = salinfo_log_write,
|
||
|
};
|
||
|
|
||
|
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, online;
|
||
|
|
||
|
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++ = create_proc_read_entry (salinfo_entries[i].name, 0, salinfo_dir,
|
||
|
salinfo_read, (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->sem, 0);
|
||
|
dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
|
||
|
if (!dir)
|
||
|
continue;
|
||
|
|
||
|
entry = create_proc_entry("event", S_IRUSR, dir);
|
||
|
if (!entry)
|
||
|
continue;
|
||
|
entry->data = data;
|
||
|
entry->proc_fops = &salinfo_event_fops;
|
||
|
*sdir++ = entry;
|
||
|
|
||
|
entry = create_proc_entry("data", S_IRUSR | S_IWUSR, dir);
|
||
|
if (!entry)
|
||
|
continue;
|
||
|
entry->data = data;
|
||
|
entry->proc_fops = &salinfo_data_fops;
|
||
|
*sdir++ = entry;
|
||
|
|
||
|
/* we missed any events before now */
|
||
|
online = 0;
|
||
|
for (j = 0; j < NR_CPUS; j++)
|
||
|
if (cpu_online(j)) {
|
||
|
set_bit(j, &data->cpu_event);
|
||
|
++online;
|
||
|
}
|
||
|
sema_init(&data->sem, online);
|
||
|
|
||
|
*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);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 'data' contains an integer that corresponds to the feature we're
|
||
|
* testing
|
||
|
*/
|
||
|
static int
|
||
|
salinfo_read(char *page, char **start, off_t off, int count, int *eof, void *data)
|
||
|
{
|
||
|
int len = 0;
|
||
|
|
||
|
len = sprintf(page, (sal_platform_features & (unsigned long)data) ? "1\n" : "0\n");
|
||
|
|
||
|
if (len <= off+count) *eof = 1;
|
||
|
|
||
|
*start = page + off;
|
||
|
len -= off;
|
||
|
|
||
|
if (len>count) len = count;
|
||
|
if (len<0) len = 0;
|
||
|
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
module_init(salinfo_init);
|