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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Alexey Dobriyan](/assets/img/avatar_default.png)
The most notable change is DEFINE_SHOW_ATTRIBUTE macro split in seq_file.h. Conversion rule is: llseek => proc_lseek unlocked_ioctl => proc_ioctl xxx => proc_xxx delete ".owner = THIS_MODULE" line [akpm@linux-foundation.org: fix drivers/isdn/capi/kcapi_proc.c] [sfr@canb.auug.org.au: fix kernel/sched/psi.c] Link: http://lkml.kernel.org/r/20200122180545.36222f50@canb.auug.org.au Link: http://lkml.kernel.org/r/20191225172546.GB13378@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
604 lines
14 KiB
C
604 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
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*
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* Communication to userspace based on kernel/printk.c
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/poll.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/vmalloc.h>
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#include <linux/spinlock.h>
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#include <linux/cpu.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/topology.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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#include <asm/rtas.h>
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#include <asm/prom.h>
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#include <asm/nvram.h>
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#include <linux/atomic.h>
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#include <asm/machdep.h>
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#include <asm/topology.h>
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static DEFINE_SPINLOCK(rtasd_log_lock);
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static DECLARE_WAIT_QUEUE_HEAD(rtas_log_wait);
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static char *rtas_log_buf;
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static unsigned long rtas_log_start;
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static unsigned long rtas_log_size;
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static int surveillance_timeout = -1;
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static unsigned int rtas_error_log_max;
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static unsigned int rtas_error_log_buffer_max;
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/* RTAS service tokens */
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static unsigned int event_scan;
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static unsigned int rtas_event_scan_rate;
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static bool full_rtas_msgs;
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/* Stop logging to nvram after first fatal error */
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static int logging_enabled; /* Until we initialize everything,
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* make sure we don't try logging
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* anything */
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static int error_log_cnt;
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/*
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* Since we use 32 bit RTAS, the physical address of this must be below
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* 4G or else bad things happen. Allocate this in the kernel data and
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* make it big enough.
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*/
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static unsigned char logdata[RTAS_ERROR_LOG_MAX];
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static char *rtas_type[] = {
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"Unknown", "Retry", "TCE Error", "Internal Device Failure",
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"Timeout", "Data Parity", "Address Parity", "Cache Parity",
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"Address Invalid", "ECC Uncorrected", "ECC Corrupted",
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};
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static char *rtas_event_type(int type)
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{
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if ((type > 0) && (type < 11))
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return rtas_type[type];
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switch (type) {
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case RTAS_TYPE_EPOW:
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return "EPOW";
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case RTAS_TYPE_PLATFORM:
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return "Platform Error";
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case RTAS_TYPE_IO:
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return "I/O Event";
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case RTAS_TYPE_INFO:
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return "Platform Information Event";
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case RTAS_TYPE_DEALLOC:
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return "Resource Deallocation Event";
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case RTAS_TYPE_DUMP:
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return "Dump Notification Event";
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case RTAS_TYPE_PRRN:
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return "Platform Resource Reassignment Event";
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case RTAS_TYPE_HOTPLUG:
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return "Hotplug Event";
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}
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return rtas_type[0];
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}
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/* To see this info, grep RTAS /var/log/messages and each entry
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* will be collected together with obvious begin/end.
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* There will be a unique identifier on the begin and end lines.
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* This will persist across reboots.
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*
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* format of error logs returned from RTAS:
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* bytes (size) : contents
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* --------------------------------------------------------
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* 0-7 (8) : rtas_error_log
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* 8-47 (40) : extended info
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* 48-51 (4) : vendor id
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* 52-1023 (vendor specific) : location code and debug data
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*/
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static void printk_log_rtas(char *buf, int len)
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{
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int i,j,n = 0;
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int perline = 16;
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char buffer[64];
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char * str = "RTAS event";
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if (full_rtas_msgs) {
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printk(RTAS_DEBUG "%d -------- %s begin --------\n",
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error_log_cnt, str);
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/*
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* Print perline bytes on each line, each line will start
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* with RTAS and a changing number, so syslogd will
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* print lines that are otherwise the same. Separate every
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* 4 bytes with a space.
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*/
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for (i = 0; i < len; i++) {
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j = i % perline;
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if (j == 0) {
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memset(buffer, 0, sizeof(buffer));
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n = sprintf(buffer, "RTAS %d:", i/perline);
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}
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if ((i % 4) == 0)
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n += sprintf(buffer+n, " ");
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n += sprintf(buffer+n, "%02x", (unsigned char)buf[i]);
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if (j == (perline-1))
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printk(KERN_DEBUG "%s\n", buffer);
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}
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if ((i % perline) != 0)
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printk(KERN_DEBUG "%s\n", buffer);
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printk(RTAS_DEBUG "%d -------- %s end ----------\n",
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error_log_cnt, str);
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} else {
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struct rtas_error_log *errlog = (struct rtas_error_log *)buf;
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printk(RTAS_DEBUG "event: %d, Type: %s (%d), Severity: %d\n",
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error_log_cnt,
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rtas_event_type(rtas_error_type(errlog)),
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rtas_error_type(errlog),
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rtas_error_severity(errlog));
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}
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}
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static int log_rtas_len(char * buf)
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{
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int len;
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struct rtas_error_log *err;
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uint32_t extended_log_length;
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/* rtas fixed header */
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len = 8;
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err = (struct rtas_error_log *)buf;
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extended_log_length = rtas_error_extended_log_length(err);
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if (rtas_error_extended(err) && extended_log_length) {
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/* extended header */
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len += extended_log_length;
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}
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if (rtas_error_log_max == 0)
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rtas_error_log_max = rtas_get_error_log_max();
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if (len > rtas_error_log_max)
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len = rtas_error_log_max;
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return len;
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}
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/*
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* First write to nvram, if fatal error, that is the only
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* place we log the info. The error will be picked up
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* on the next reboot by rtasd. If not fatal, run the
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* method for the type of error. Currently, only RTAS
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* errors have methods implemented, but in the future
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* there might be a need to store data in nvram before a
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* call to panic().
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*
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* XXX We write to nvram periodically, to indicate error has
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* been written and sync'd, but there is a possibility
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* that if we don't shutdown correctly, a duplicate error
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* record will be created on next reboot.
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*/
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void pSeries_log_error(char *buf, unsigned int err_type, int fatal)
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{
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unsigned long offset;
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unsigned long s;
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int len = 0;
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pr_debug("rtasd: logging event\n");
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if (buf == NULL)
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return;
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spin_lock_irqsave(&rtasd_log_lock, s);
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/* get length and increase count */
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switch (err_type & ERR_TYPE_MASK) {
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case ERR_TYPE_RTAS_LOG:
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len = log_rtas_len(buf);
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if (!(err_type & ERR_FLAG_BOOT))
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error_log_cnt++;
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break;
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case ERR_TYPE_KERNEL_PANIC:
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default:
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WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */
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spin_unlock_irqrestore(&rtasd_log_lock, s);
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return;
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}
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#ifdef CONFIG_PPC64
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/* Write error to NVRAM */
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if (logging_enabled && !(err_type & ERR_FLAG_BOOT))
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nvram_write_error_log(buf, len, err_type, error_log_cnt);
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#endif /* CONFIG_PPC64 */
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/*
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* rtas errors can occur during boot, and we do want to capture
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* those somewhere, even if nvram isn't ready (why not?), and even
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* if rtasd isn't ready. Put them into the boot log, at least.
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*/
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if ((err_type & ERR_TYPE_MASK) == ERR_TYPE_RTAS_LOG)
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printk_log_rtas(buf, len);
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/* Check to see if we need to or have stopped logging */
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if (fatal || !logging_enabled) {
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logging_enabled = 0;
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WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */
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spin_unlock_irqrestore(&rtasd_log_lock, s);
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return;
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}
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/* call type specific method for error */
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switch (err_type & ERR_TYPE_MASK) {
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case ERR_TYPE_RTAS_LOG:
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offset = rtas_error_log_buffer_max *
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((rtas_log_start+rtas_log_size) & LOG_NUMBER_MASK);
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/* First copy over sequence number */
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memcpy(&rtas_log_buf[offset], (void *) &error_log_cnt, sizeof(int));
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/* Second copy over error log data */
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offset += sizeof(int);
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memcpy(&rtas_log_buf[offset], buf, len);
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if (rtas_log_size < LOG_NUMBER)
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rtas_log_size += 1;
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else
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rtas_log_start += 1;
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WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */
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spin_unlock_irqrestore(&rtasd_log_lock, s);
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wake_up_interruptible(&rtas_log_wait);
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break;
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case ERR_TYPE_KERNEL_PANIC:
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default:
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WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */
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spin_unlock_irqrestore(&rtasd_log_lock, s);
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return;
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}
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}
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#ifdef CONFIG_PPC_PSERIES
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static void handle_prrn_event(s32 scope)
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{
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/*
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* For PRRN, we must pass the negative of the scope value in
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* the RTAS event.
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*/
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pseries_devicetree_update(-scope);
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numa_update_cpu_topology(false);
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}
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static void handle_rtas_event(const struct rtas_error_log *log)
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{
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if (rtas_error_type(log) != RTAS_TYPE_PRRN || !prrn_is_enabled())
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return;
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/* For PRRN Events the extended log length is used to denote
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* the scope for calling rtas update-nodes.
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*/
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handle_prrn_event(rtas_error_extended_log_length(log));
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}
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#else
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static void handle_rtas_event(const struct rtas_error_log *log)
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{
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return;
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}
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#endif
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static int rtas_log_open(struct inode * inode, struct file * file)
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{
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return 0;
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}
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static int rtas_log_release(struct inode * inode, struct file * file)
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{
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return 0;
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}
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/* This will check if all events are logged, if they are then, we
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* know that we can safely clear the events in NVRAM.
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* Next we'll sit and wait for something else to log.
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*/
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static ssize_t rtas_log_read(struct file * file, char __user * buf,
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size_t count, loff_t *ppos)
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{
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int error;
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char *tmp;
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unsigned long s;
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unsigned long offset;
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if (!buf || count < rtas_error_log_buffer_max)
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return -EINVAL;
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count = rtas_error_log_buffer_max;
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if (!access_ok(buf, count))
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return -EFAULT;
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tmp = kmalloc(count, GFP_KERNEL);
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if (!tmp)
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return -ENOMEM;
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spin_lock_irqsave(&rtasd_log_lock, s);
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/* if it's 0, then we know we got the last one (the one in NVRAM) */
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while (rtas_log_size == 0) {
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if (file->f_flags & O_NONBLOCK) {
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spin_unlock_irqrestore(&rtasd_log_lock, s);
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error = -EAGAIN;
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goto out;
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}
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if (!logging_enabled) {
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spin_unlock_irqrestore(&rtasd_log_lock, s);
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error = -ENODATA;
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goto out;
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}
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#ifdef CONFIG_PPC64
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nvram_clear_error_log();
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#endif /* CONFIG_PPC64 */
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spin_unlock_irqrestore(&rtasd_log_lock, s);
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error = wait_event_interruptible(rtas_log_wait, rtas_log_size);
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if (error)
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goto out;
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spin_lock_irqsave(&rtasd_log_lock, s);
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}
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offset = rtas_error_log_buffer_max * (rtas_log_start & LOG_NUMBER_MASK);
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memcpy(tmp, &rtas_log_buf[offset], count);
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rtas_log_start += 1;
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rtas_log_size -= 1;
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spin_unlock_irqrestore(&rtasd_log_lock, s);
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error = copy_to_user(buf, tmp, count) ? -EFAULT : count;
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out:
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kfree(tmp);
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return error;
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}
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static __poll_t rtas_log_poll(struct file *file, poll_table * wait)
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{
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poll_wait(file, &rtas_log_wait, wait);
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if (rtas_log_size)
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return EPOLLIN | EPOLLRDNORM;
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return 0;
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}
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static const struct proc_ops rtas_log_proc_ops = {
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.proc_read = rtas_log_read,
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.proc_poll = rtas_log_poll,
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.proc_open = rtas_log_open,
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.proc_release = rtas_log_release,
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.proc_lseek = noop_llseek,
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};
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static int enable_surveillance(int timeout)
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{
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int error;
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error = rtas_set_indicator(SURVEILLANCE_TOKEN, 0, timeout);
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if (error == 0)
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return 0;
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if (error == -EINVAL) {
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printk(KERN_DEBUG "rtasd: surveillance not supported\n");
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return 0;
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}
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printk(KERN_ERR "rtasd: could not update surveillance\n");
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return -1;
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}
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static void do_event_scan(void)
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{
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int error;
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do {
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memset(logdata, 0, rtas_error_log_max);
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error = rtas_call(event_scan, 4, 1, NULL,
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RTAS_EVENT_SCAN_ALL_EVENTS, 0,
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__pa(logdata), rtas_error_log_max);
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if (error == -1) {
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printk(KERN_ERR "event-scan failed\n");
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break;
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}
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if (error == 0) {
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if (rtas_error_type((struct rtas_error_log *)logdata) !=
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RTAS_TYPE_PRRN)
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pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG,
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0);
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handle_rtas_event((struct rtas_error_log *)logdata);
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}
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} while(error == 0);
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}
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static void rtas_event_scan(struct work_struct *w);
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static DECLARE_DELAYED_WORK(event_scan_work, rtas_event_scan);
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/*
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* Delay should be at least one second since some machines have problems if
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* we call event-scan too quickly.
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*/
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static unsigned long event_scan_delay = 1*HZ;
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static int first_pass = 1;
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static void rtas_event_scan(struct work_struct *w)
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{
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unsigned int cpu;
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do_event_scan();
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get_online_cpus();
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/* raw_ OK because just using CPU as starting point. */
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cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask);
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if (cpu >= nr_cpu_ids) {
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cpu = cpumask_first(cpu_online_mask);
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if (first_pass) {
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first_pass = 0;
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event_scan_delay = 30*HZ/rtas_event_scan_rate;
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if (surveillance_timeout != -1) {
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pr_debug("rtasd: enabling surveillance\n");
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enable_surveillance(surveillance_timeout);
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pr_debug("rtasd: surveillance enabled\n");
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}
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}
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}
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schedule_delayed_work_on(cpu, &event_scan_work,
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__round_jiffies_relative(event_scan_delay, cpu));
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put_online_cpus();
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}
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#ifdef CONFIG_PPC64
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static void retrieve_nvram_error_log(void)
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{
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unsigned int err_type ;
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int rc ;
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/* See if we have any error stored in NVRAM */
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memset(logdata, 0, rtas_error_log_max);
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rc = nvram_read_error_log(logdata, rtas_error_log_max,
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&err_type, &error_log_cnt);
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/* We can use rtas_log_buf now */
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logging_enabled = 1;
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if (!rc) {
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if (err_type != ERR_FLAG_ALREADY_LOGGED) {
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pSeries_log_error(logdata, err_type | ERR_FLAG_BOOT, 0);
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}
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}
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}
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#else /* CONFIG_PPC64 */
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static void retrieve_nvram_error_log(void)
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{
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}
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#endif /* CONFIG_PPC64 */
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static void start_event_scan(void)
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{
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printk(KERN_DEBUG "RTAS daemon started\n");
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pr_debug("rtasd: will sleep for %d milliseconds\n",
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(30000 / rtas_event_scan_rate));
|
|
|
|
/* Retrieve errors from nvram if any */
|
|
retrieve_nvram_error_log();
|
|
|
|
schedule_delayed_work_on(cpumask_first(cpu_online_mask),
|
|
&event_scan_work, event_scan_delay);
|
|
}
|
|
|
|
/* Cancel the rtas event scan work */
|
|
void rtas_cancel_event_scan(void)
|
|
{
|
|
cancel_delayed_work_sync(&event_scan_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rtas_cancel_event_scan);
|
|
|
|
static int __init rtas_event_scan_init(void)
|
|
{
|
|
if (!machine_is(pseries) && !machine_is(chrp))
|
|
return 0;
|
|
|
|
/* No RTAS */
|
|
event_scan = rtas_token("event-scan");
|
|
if (event_scan == RTAS_UNKNOWN_SERVICE) {
|
|
printk(KERN_INFO "rtasd: No event-scan on system\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
rtas_event_scan_rate = rtas_token("rtas-event-scan-rate");
|
|
if (rtas_event_scan_rate == RTAS_UNKNOWN_SERVICE) {
|
|
printk(KERN_ERR "rtasd: no rtas-event-scan-rate on system\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!rtas_event_scan_rate) {
|
|
/* Broken firmware: take a rate of zero to mean don't scan */
|
|
printk(KERN_DEBUG "rtasd: scan rate is 0, not scanning\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Make room for the sequence number */
|
|
rtas_error_log_max = rtas_get_error_log_max();
|
|
rtas_error_log_buffer_max = rtas_error_log_max + sizeof(int);
|
|
|
|
rtas_log_buf = vmalloc(array_size(LOG_NUMBER,
|
|
rtas_error_log_buffer_max));
|
|
if (!rtas_log_buf) {
|
|
printk(KERN_ERR "rtasd: no memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
start_event_scan();
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(rtas_event_scan_init);
|
|
|
|
static int __init rtas_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
if (!machine_is(pseries) && !machine_is(chrp))
|
|
return 0;
|
|
|
|
if (!rtas_log_buf)
|
|
return -ENODEV;
|
|
|
|
entry = proc_create("powerpc/rtas/error_log", 0400, NULL,
|
|
&rtas_log_proc_ops);
|
|
if (!entry)
|
|
printk(KERN_ERR "Failed to create error_log proc entry\n");
|
|
|
|
return 0;
|
|
}
|
|
__initcall(rtas_init);
|
|
|
|
static int __init surveillance_setup(char *str)
|
|
{
|
|
int i;
|
|
|
|
/* We only do surveillance on pseries */
|
|
if (!machine_is(pseries))
|
|
return 0;
|
|
|
|
if (get_option(&str,&i)) {
|
|
if (i >= 0 && i <= 255)
|
|
surveillance_timeout = i;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
__setup("surveillance=", surveillance_setup);
|
|
|
|
static int __init rtasmsgs_setup(char *str)
|
|
{
|
|
return (kstrtobool(str, &full_rtas_msgs) == 0);
|
|
}
|
|
__setup("rtasmsgs=", rtasmsgs_setup);
|