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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Arnd Bergmann](/assets/img/avatar_default.png)
All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
547 lines
13 KiB
C
547 lines
13 KiB
C
/*
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* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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 <asm/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 <asm/atomic.h>
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#include <asm/machdep.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 int full_rtas_msgs = 0;
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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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}
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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, Severity: %d\n",
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error_log_cnt, rtas_event_type(errlog->type),
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errlog->severity);
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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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/* rtas fixed header */
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len = 8;
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err = (struct rtas_error_log *)buf;
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if (err->extended_log_length) {
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/* extended header */
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len += err->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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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(VERIFY_WRITE, 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 unsigned int 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 POLLIN | POLLRDNORM;
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return 0;
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}
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static const struct file_operations proc_rtas_log_operations = {
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.read = rtas_log_read,
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.poll = rtas_log_poll,
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.open = rtas_log_open,
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.release = rtas_log_release,
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.llseek = 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)
|
|
pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, 0);
|
|
|
|
} while(error == 0);
|
|
}
|
|
|
|
static void rtas_event_scan(struct work_struct *w);
|
|
DECLARE_DELAYED_WORK(event_scan_work, rtas_event_scan);
|
|
|
|
/*
|
|
* Delay should be at least one second since some machines have problems if
|
|
* we call event-scan too quickly.
|
|
*/
|
|
static unsigned long event_scan_delay = 1*HZ;
|
|
static int first_pass = 1;
|
|
|
|
static void rtas_event_scan(struct work_struct *w)
|
|
{
|
|
unsigned int cpu;
|
|
|
|
do_event_scan();
|
|
|
|
get_online_cpus();
|
|
|
|
cpu = cpumask_next(smp_processor_id(), cpu_online_mask);
|
|
if (cpu >= nr_cpu_ids) {
|
|
cpu = cpumask_first(cpu_online_mask);
|
|
|
|
if (first_pass) {
|
|
first_pass = 0;
|
|
event_scan_delay = 30*HZ/rtas_event_scan_rate;
|
|
|
|
if (surveillance_timeout != -1) {
|
|
pr_debug("rtasd: enabling surveillance\n");
|
|
enable_surveillance(surveillance_timeout);
|
|
pr_debug("rtasd: surveillance enabled\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
schedule_delayed_work_on(cpu, &event_scan_work,
|
|
__round_jiffies_relative(event_scan_delay, cpu));
|
|
|
|
put_online_cpus();
|
|
}
|
|
|
|
#ifdef CONFIG_PPC64
|
|
static void retreive_nvram_error_log(void)
|
|
{
|
|
unsigned int err_type ;
|
|
int rc ;
|
|
|
|
/* See if we have any error stored in NVRAM */
|
|
memset(logdata, 0, rtas_error_log_max);
|
|
rc = nvram_read_error_log(logdata, rtas_error_log_max,
|
|
&err_type, &error_log_cnt);
|
|
/* We can use rtas_log_buf now */
|
|
logging_enabled = 1;
|
|
if (!rc) {
|
|
if (err_type != ERR_FLAG_ALREADY_LOGGED) {
|
|
pSeries_log_error(logdata, err_type | ERR_FLAG_BOOT, 0);
|
|
}
|
|
}
|
|
}
|
|
#else /* CONFIG_PPC64 */
|
|
static void retreive_nvram_error_log(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
static void start_event_scan(void)
|
|
{
|
|
printk(KERN_DEBUG "RTAS daemon started\n");
|
|
pr_debug("rtasd: will sleep for %d milliseconds\n",
|
|
(30000 / rtas_event_scan_rate));
|
|
|
|
/* Retreive errors from nvram if any */
|
|
retreive_nvram_error_log();
|
|
|
|
schedule_delayed_work_on(cpumask_first(cpu_online_mask),
|
|
&event_scan_work, event_scan_delay);
|
|
}
|
|
|
|
static int __init rtas_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
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(rtas_error_log_buffer_max*LOG_NUMBER);
|
|
if (!rtas_log_buf) {
|
|
printk(KERN_ERR "rtasd: no memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
entry = proc_create("powerpc/rtas/error_log", S_IRUSR, NULL,
|
|
&proc_rtas_log_operations);
|
|
if (!entry)
|
|
printk(KERN_ERR "Failed to create error_log proc entry\n");
|
|
|
|
start_event_scan();
|
|
|
|
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)
|
|
{
|
|
if (strcmp(str, "on") == 0)
|
|
full_rtas_msgs = 1;
|
|
else if (strcmp(str, "off") == 0)
|
|
full_rtas_msgs = 0;
|
|
|
|
return 1;
|
|
}
|
|
__setup("rtasmsgs=", rtasmsgs_setup);
|