diff options
Diffstat (limited to 'fs/pstore')
| -rw-r--r-- | fs/pstore/Kconfig | 19 | ||||
| -rw-r--r-- | fs/pstore/Makefile | 1 | ||||
| -rw-r--r-- | fs/pstore/ftrace.c | 35 | ||||
| -rw-r--r-- | fs/pstore/inode.c | 114 | ||||
| -rw-r--r-- | fs/pstore/internal.h | 45 | ||||
| -rw-r--r-- | fs/pstore/platform.c | 66 | ||||
| -rw-r--r-- | fs/pstore/ram.c | 368 | ||||
| -rw-r--r-- | fs/pstore/ram_core.c | 150 |
8 files changed, 576 insertions, 222 deletions
diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig index 23ade2680a4..d39bb5cce88 100644 --- a/fs/pstore/Kconfig +++ b/fs/pstore/Kconfig @@ -12,6 +12,25 @@ config PSTORE If you don't have a platform persistent store driver, say N. +config PSTORE_CONSOLE + bool "Log kernel console messages" + depends on PSTORE + help + When the option is enabled, pstore will log all kernel + messages, even if no oops or panic happened. + +config PSTORE_FTRACE + bool "Persistent function tracer" + depends on PSTORE + depends on FUNCTION_TRACER + help + With this option kernel traces function calls into a persistent + ram buffer that can be decoded and dumped after reboot through + pstore filesystem. It can be used to determine what function + was last called before a reset or panic. + + If unsure, say N. + config PSTORE_RAM tristate "Log panic/oops to a RAM buffer" depends on PSTORE diff --git a/fs/pstore/Makefile b/fs/pstore/Makefile index 278a44e0d4e..4c9095c2781 100644 --- a/fs/pstore/Makefile +++ b/fs/pstore/Makefile @@ -5,6 +5,7 @@ obj-y += pstore.o pstore-objs += inode.o platform.o +obj-$(CONFIG_PSTORE_FTRACE) += ftrace.o ramoops-objs += ram.o ram_core.o obj-$(CONFIG_PSTORE_RAM) += ramoops.o diff --git a/fs/pstore/ftrace.c b/fs/pstore/ftrace.c new file mode 100644 index 00000000000..a130d484b7d --- /dev/null +++ b/fs/pstore/ftrace.c @@ -0,0 +1,35 @@ +/* + * Copyright 2012 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/kernel.h> +#include <linux/compiler.h> +#include <linux/irqflags.h> +#include <linux/percpu.h> +#include <linux/smp.h> +#include <linux/atomic.h> +#include <asm/barrier.h> +#include "internal.h" + +void notrace pstore_ftrace_call(unsigned long ip, unsigned long parent_ip) +{ + struct pstore_ftrace_record rec = {}; + + if (unlikely(oops_in_progress)) + return; + + rec.ip = ip; + rec.parent_ip = parent_ip; + pstore_ftrace_encode_cpu(&rec, raw_smp_processor_id()); + psinfo->write_buf(PSTORE_TYPE_FTRACE, 0, NULL, 0, (void *)&rec, + sizeof(rec), psinfo); +} diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c index 11a2aa2a56c..4ab572e6d27 100644 --- a/fs/pstore/inode.c +++ b/fs/pstore/inode.c @@ -27,6 +27,7 @@ #include <linux/list.h> #include <linux/string.h> #include <linux/mount.h> +#include <linux/seq_file.h> #include <linux/ramfs.h> #include <linux/parser.h> #include <linux/sched.h> @@ -52,18 +53,117 @@ struct pstore_private { char data[]; }; +struct pstore_ftrace_seq_data { + const void *ptr; + size_t off; + size_t size; +}; + +#define REC_SIZE sizeof(struct pstore_ftrace_record) + +static void *pstore_ftrace_seq_start(struct seq_file *s, loff_t *pos) +{ + struct pstore_private *ps = s->private; + struct pstore_ftrace_seq_data *data; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return NULL; + + data->off = ps->size % REC_SIZE; + data->off += *pos * REC_SIZE; + if (data->off + REC_SIZE > ps->size) { + kfree(data); + return NULL; + } + + return data; + +} + +static void pstore_ftrace_seq_stop(struct seq_file *s, void *v) +{ + kfree(v); +} + +static void *pstore_ftrace_seq_next(struct seq_file *s, void *v, loff_t *pos) +{ + struct pstore_private *ps = s->private; + struct pstore_ftrace_seq_data *data = v; + + data->off += REC_SIZE; + if (data->off + REC_SIZE > ps->size) + return NULL; + + (*pos)++; + return data; +} + +static int pstore_ftrace_seq_show(struct seq_file *s, void *v) +{ + struct pstore_private *ps = s->private; + struct pstore_ftrace_seq_data *data = v; + struct pstore_ftrace_record *rec = (void *)(ps->data + data->off); + + seq_printf(s, "%d %08lx %08lx %pf <- %pF\n", + pstore_ftrace_decode_cpu(rec), rec->ip, rec->parent_ip, + (void *)rec->ip, (void *)rec->parent_ip); + + return 0; +} + +static const struct seq_operations pstore_ftrace_seq_ops = { + .start = pstore_ftrace_seq_start, + .next = pstore_ftrace_seq_next, + .stop = pstore_ftrace_seq_stop, + .show = pstore_ftrace_seq_show, +}; + static ssize_t pstore_file_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { - struct pstore_private *ps = file->private_data; + struct seq_file *sf = file->private_data; + struct pstore_private *ps = sf->private; + if (ps->type == PSTORE_TYPE_FTRACE) + return seq_read(file, userbuf, count, ppos); return simple_read_from_buffer(userbuf, count, ppos, ps->data, ps->size); } +static int pstore_file_open(struct inode *inode, struct file *file) +{ + struct pstore_private *ps = inode->i_private; + struct seq_file *sf; + int err; + const struct seq_operations *sops = NULL; + + if (ps->type == PSTORE_TYPE_FTRACE) + sops = &pstore_ftrace_seq_ops; + + err = seq_open(file, sops); + if (err < 0) + return err; + + sf = file->private_data; + sf->private = ps; + + return 0; +} + +static loff_t pstore_file_llseek(struct file *file, loff_t off, int origin) +{ + struct seq_file *sf = file->private_data; + + if (sf->op) + return seq_lseek(file, off, origin); + return default_llseek(file, off, origin); +} + static const struct file_operations pstore_file_operations = { - .open = simple_open, - .read = pstore_file_read, - .llseek = default_llseek, + .open = pstore_file_open, + .read = pstore_file_read, + .llseek = pstore_file_llseek, + .release = seq_release, }; /* @@ -212,6 +312,12 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, case PSTORE_TYPE_DMESG: sprintf(name, "dmesg-%s-%lld", psname, id); break; + case PSTORE_TYPE_CONSOLE: + sprintf(name, "console-%s", psname); + break; + case PSTORE_TYPE_FTRACE: + sprintf(name, "ftrace-%s", psname); + break; case PSTORE_TYPE_MCE: sprintf(name, "mce-%s-%lld", psname, id); break; diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h index 3bde461c3f3..0d0d3b7d5f1 100644 --- a/fs/pstore/internal.h +++ b/fs/pstore/internal.h @@ -1,6 +1,51 @@ +#ifndef __PSTORE_INTERNAL_H__ +#define __PSTORE_INTERNAL_H__ + +#include <linux/types.h> +#include <linux/time.h> +#include <linux/pstore.h> + +#if NR_CPUS <= 2 && defined(CONFIG_ARM_THUMB) +#define PSTORE_CPU_IN_IP 0x1 +#elif NR_CPUS <= 4 && defined(CONFIG_ARM) +#define PSTORE_CPU_IN_IP 0x3 +#endif + +struct pstore_ftrace_record { + unsigned long ip; + unsigned long parent_ip; +#ifndef PSTORE_CPU_IN_IP + unsigned int cpu; +#endif +}; + +static inline void +pstore_ftrace_encode_cpu(struct pstore_ftrace_record *rec, unsigned int cpu) +{ +#ifndef PSTORE_CPU_IN_IP + rec->cpu = cpu; +#else + rec->ip |= cpu; +#endif +} + +static inline unsigned int +pstore_ftrace_decode_cpu(struct pstore_ftrace_record *rec) +{ +#ifndef PSTORE_CPU_IN_IP + return rec->cpu; +#else + return rec->ip & PSTORE_CPU_IN_IP; +#endif +} + +extern struct pstore_info *psinfo; + extern void pstore_set_kmsg_bytes(int); extern void pstore_get_records(int); extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id, char *data, size_t size, struct timespec time, struct pstore_info *psi); extern int pstore_is_mounted(void); + +#endif diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 03ce7a9b81c..29996e8793a 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -1,6 +1,7 @@ /* * Persistent Storage - platform driver interface parts. * + * Copyright (C) 2007-2008 Google, Inc. * Copyright (C) 2010 Intel Corporation <tony.luck@intel.com> * * This program is free software; you can redistribute it and/or modify @@ -22,6 +23,7 @@ #include <linux/errno.h> #include <linux/init.h> #include <linux/kmsg_dump.h> +#include <linux/console.h> #include <linux/module.h> #include <linux/pstore.h> #include <linux/string.h> @@ -29,6 +31,7 @@ #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/hardirq.h> +#include <linux/jiffies.h> #include <linux/workqueue.h> #include "internal.h" @@ -38,7 +41,12 @@ * whether the system is actually still running well enough * to let someone see the entry */ -#define PSTORE_INTERVAL (60 * HZ) +static int pstore_update_ms = -1; +module_param_named(update_ms, pstore_update_ms, int, 0600); +MODULE_PARM_DESC(update_ms, "milliseconds before pstore updates its content " + "(default is -1, which means runtime updates are disabled; " + "enabling this option is not safe, it may lead to further " + "corruption on Oopses)"); static int pstore_new_entry; @@ -53,7 +61,7 @@ static DECLARE_WORK(pstore_work, pstore_dowork); * calls to pstore_register() */ static DEFINE_SPINLOCK(pstore_lock); -static struct pstore_info *psinfo; +struct pstore_info *psinfo; static char *backend; @@ -146,6 +154,48 @@ static struct kmsg_dumper pstore_dumper = { .dump = pstore_dump, }; +#ifdef CONFIG_PSTORE_CONSOLE +static void pstore_console_write(struct console *con, const char *s, unsigned c) +{ + const char *e = s + c; + + while (s < e) { + unsigned long flags; + + if (c > psinfo->bufsize) + c = psinfo->bufsize; + spin_lock_irqsave(&psinfo->buf_lock, flags); + memcpy(psinfo->buf, s, c); + psinfo->write(PSTORE_TYPE_CONSOLE, 0, NULL, 0, c, psinfo); + spin_unlock_irqrestore(&psinfo->buf_lock, flags); + s += c; + c = e - s; + } +} + +static struct console pstore_console = { + .name = "pstore", + .write = pstore_console_write, + .flags = CON_PRINTBUFFER | CON_ENABLED | CON_ANYTIME, + .index = -1, +}; + +static void pstore_register_console(void) +{ + register_console(&pstore_console); +} +#else +static void pstore_register_console(void) {} +#endif + +static int pstore_write_compat(enum pstore_type_id type, + enum kmsg_dump_reason reason, + u64 *id, unsigned int part, + size_t size, struct pstore_info *psi) +{ + return psi->write_buf(type, reason, id, part, psinfo->buf, size, psi); +} + /* * platform specific persistent storage driver registers with * us here. If pstore is already mounted, call the platform @@ -170,6 +220,8 @@ int pstore_register(struct pstore_info *psi) return -EINVAL; } + if (!psi->write) + psi->write = pstore_write_compat; psinfo = psi; mutex_init(&psinfo->read_mutex); spin_unlock(&pstore_lock); @@ -183,9 +235,13 @@ int pstore_register(struct pstore_info *psi) pstore_get_records(0); kmsg_dump_register(&pstore_dumper); + pstore_register_console(); - pstore_timer.expires = jiffies + PSTORE_INTERVAL; - add_timer(&pstore_timer); + if (pstore_update_ms >= 0) { + pstore_timer.expires = jiffies + + msecs_to_jiffies(pstore_update_ms); + add_timer(&pstore_timer); + } return 0; } @@ -244,7 +300,7 @@ static void pstore_timefunc(unsigned long dummy) schedule_work(&pstore_work); } - mod_timer(&pstore_timer, jiffies + PSTORE_INTERVAL); + mod_timer(&pstore_timer, jiffies + msecs_to_jiffies(pstore_update_ms)); } module_param(backend, charp, 0444); diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index 453030f9c5b..0b311bc1891 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -25,6 +25,7 @@ #include <linux/kernel.h> #include <linux/err.h> #include <linux/module.h> +#include <linux/version.h> #include <linux/pstore.h> #include <linux/time.h> #include <linux/io.h> @@ -41,6 +42,14 @@ module_param(record_size, ulong, 0400); MODULE_PARM_DESC(record_size, "size of each dump done on oops/panic"); +static ulong ramoops_console_size = MIN_MEM_SIZE; +module_param_named(console_size, ramoops_console_size, ulong, 0400); +MODULE_PARM_DESC(console_size, "size of kernel console log"); + +static ulong ramoops_ftrace_size = MIN_MEM_SIZE; +module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); +MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); + static ulong mem_address; module_param(mem_address, ulong, 0400); MODULE_PARM_DESC(mem_address, @@ -59,18 +68,26 @@ MODULE_PARM_DESC(dump_oops, static int ramoops_ecc; module_param_named(ecc, ramoops_ecc, int, 0600); MODULE_PARM_DESC(ramoops_ecc, - "set to 1 to enable ECC support"); + "if non-zero, the option enables ECC support and specifies " + "ECC buffer size in bytes (1 is a special value, means 16 " + "bytes ECC)"); struct ramoops_context { struct persistent_ram_zone **przs; + struct persistent_ram_zone *cprz; + struct persistent_ram_zone *fprz; phys_addr_t phys_addr; unsigned long size; size_t record_size; + size_t console_size; + size_t ftrace_size; int dump_oops; - bool ecc; - unsigned int count; - unsigned int max_count; - unsigned int read_count; + int ecc_size; + unsigned int max_dump_cnt; + unsigned int dump_write_cnt; + unsigned int dump_read_cnt; + unsigned int console_read_cnt; + unsigned int ftrace_read_cnt; struct pstore_info pstore; }; @@ -81,10 +98,38 @@ static int ramoops_pstore_open(struct pstore_info *psi) { struct ramoops_context *cxt = psi->data; - cxt->read_count = 0; + cxt->dump_read_cnt = 0; + cxt->console_read_cnt = 0; return 0; } +static struct persistent_ram_zone * +ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, + u64 *id, + enum pstore_type_id *typep, enum pstore_type_id type, + bool update) +{ + struct persistent_ram_zone *prz; + int i = (*c)++; + + if (i >= max) + return NULL; + + prz = przs[i]; + + if (update) { + /* Update old/shadowed buffer. */ + persistent_ram_save_old(prz); + if (!persistent_ram_old_size(prz)) + return NULL; + } + + *typep = type; + *id = i; + + return prz; +} + static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, struct timespec *time, char **buf, @@ -94,20 +139,22 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, struct ramoops_context *cxt = psi->data; struct persistent_ram_zone *prz; - if (cxt->read_count >= cxt->max_count) - return -EINVAL; + prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, + cxt->max_dump_cnt, id, type, + PSTORE_TYPE_DMESG, 1); + if (!prz) + prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, + 1, id, type, PSTORE_TYPE_CONSOLE, 0); + if (!prz) + prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, + 1, id, type, PSTORE_TYPE_FTRACE, 0); + if (!prz) + return 0; - *id = cxt->read_count++; - prz = cxt->przs[*id]; - - /* Only supports dmesg output so far. */ - *type = PSTORE_TYPE_DMESG; /* TODO(kees): Bogus time for the moment. */ time->tv_sec = 0; time->tv_nsec = 0; - /* Update old/shadowed buffer. */ - persistent_ram_save_old(prz); size = persistent_ram_old_size(prz); *buf = kmalloc(size, GFP_KERNEL); if (*buf == NULL) @@ -134,17 +181,29 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz) return len; } -static int ramoops_pstore_write(enum pstore_type_id type, - enum kmsg_dump_reason reason, - u64 *id, - unsigned int part, - size_t size, struct pstore_info *psi) + +static int ramoops_pstore_write_buf(enum pstore_type_id type, + enum kmsg_dump_reason reason, + u64 *id, unsigned int part, + const char *buf, size_t size, + struct pstore_info *psi) { struct ramoops_context *cxt = psi->data; - struct persistent_ram_zone *prz = cxt->przs[cxt->count]; + struct persistent_ram_zone *prz = cxt->przs[cxt->dump_write_cnt]; size_t hlen; - /* Currently ramoops is designed to only store dmesg dumps. */ + if (type == PSTORE_TYPE_CONSOLE) { + if (!cxt->cprz) + return -ENOMEM; + persistent_ram_write(cxt->cprz, buf, size); + return 0; + } else if (type == PSTORE_TYPE_FTRACE) { + if (!cxt->fprz) + return -ENOMEM; + persistent_ram_write(cxt->fprz, buf, size); + return 0; + } + if (type != PSTORE_TYPE_DMESG) return -EINVAL; @@ -170,9 +229,9 @@ static int ramoops_pstore_write(enum pstore_type_id type, hlen = ramoops_write_kmsg_hdr(prz); if (size + hlen > prz->buffer_size) size = prz->buffer_size - hlen; - persistent_ram_write(prz, cxt->pstore.buf, size); + persistent_ram_write(prz, buf, size); - cxt->count = (cxt->count + 1) % cxt->max_count; + cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; return 0; } @@ -181,12 +240,26 @@ static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, struct pstore_info *psi) { struct ramoops_context *cxt = psi->data; + struct persistent_ram_zone *prz; - if (id >= cxt->max_count) + switch (type) { + case PSTORE_TYPE_DMESG: + if (id >= cxt->max_dump_cnt) + return -EINVAL; + prz = cxt->przs[id]; + break; + case PSTORE_TYPE_CONSOLE: + prz = cxt->cprz; + break; + case PSTORE_TYPE_FTRACE: + prz = cxt->fprz; + break; + default: return -EINVAL; + } - persistent_ram_free_old(cxt->przs[id]); - persistent_ram_zap(cxt->przs[id]); + persistent_ram_free_old(prz); + persistent_ram_zap(prz); return 0; } @@ -197,78 +270,157 @@ static struct ramoops_context oops_cxt = { .name = "ramoops", .open = ramoops_pstore_open, .read = ramoops_pstore_read, - .write = ramoops_pstore_write, + .write_buf = ramoops_pstore_write_buf, .erase = ramoops_pstore_erase, }, }; -static int __init ramoops_probe(struct platform_device *pdev) +static void ramoops_free_przs(struct ramoops_context *cxt) +{ + int i; + + if (!cxt->przs) + return; + + for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) + persistent_ram_free(cxt->przs[i]); + kfree(cxt->przs); +} + +static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, + phys_addr_t *paddr, size_t dump_mem_sz) +{ + int err = -ENOMEM; + int i; + + if (!cxt->record_size) + return 0; + + cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; + if (!cxt->max_dump_cnt) + return -ENOMEM; + + cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, + GFP_KERNEL); + if (!cxt->przs) { + dev_err(dev, "failed to initialize a prz array for dumps\n"); + return -ENOMEM; + } + + for (i = 0; i < cxt->max_dump_cnt; i++) { + size_t sz = cxt->record_size; + + cxt->przs[i] = persistent_ram_new(*paddr, sz, 0, cxt->ecc_size); + if (IS_ERR(cxt->przs[i])) { + err = PTR_ERR(cxt->przs[i]); + dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", + sz, (unsigned long long)*paddr, err); + goto fail_prz; + } + *paddr += sz; + } + + return 0; +fail_prz: + ramoops_free_przs(cxt); + return err; +} + +static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, + struct persistent_ram_zone **prz, + phys_addr_t *paddr, size_t sz, u32 sig) +{ + if (!sz) + return 0; + + if (*paddr + sz > *paddr + cxt->size) + return -ENOMEM; + + *prz = persistent_ram_new(*paddr, sz, sig, cxt->ecc_size); + if (IS_ERR(*prz)) { + int err = PTR_ERR(*prz); + + dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", + sz, (unsigned long long)*paddr, err); + return err; + } + + persistent_ram_zap(*prz); + + *paddr += sz; + + return 0; +} + +static int __devinit ramoops_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct ramoops_platform_data *pdata = pdev->dev.platform_data; struct ramoops_context *cxt = &oops_cxt; + size_t dump_mem_sz; + phys_addr_t paddr; int err = -EINVAL; - int i; /* Only a single ramoops area allowed at a time, so fail extra * probes. */ - if (cxt->max_count) + if (cxt->max_dump_cnt) goto fail_out; - if (!pdata->mem_size || !pdata->record_size) { - pr_err("The memory size and the record size must be " + if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && + !pdata->ftrace_size)) { + pr_err("The memory size and the record/console size must be " "non-zero\n"); goto fail_out; } pdata->mem_size = rounddown_pow_of_two(pdata->mem_size); pdata->record_size = rounddown_pow_of_two(pdata->record_size); + pdata->console_size = rounddown_pow_of_two(pdata->console_size); + pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); - /* Check for the minimum memory size */ - if (pdata->mem_size < MIN_MEM_SIZE && - pdata->record_size < MIN_MEM_SIZE) { - pr_err("memory size too small, minimum is %lu\n", - MIN_MEM_SIZE); - goto fail_out; - } - - if (pdata->mem_size < pdata->record_size) { - pr_err("The memory size must be larger than the " - "records size\n"); - goto fail_out; - } - - cxt->max_count = pdata->mem_size / pdata->record_size; - cxt->count = 0; + cxt->dump_read_cnt = 0; cxt->size = pdata->mem_size; cxt->phys_addr = pdata->mem_address; cxt->record_size = pdata->record_size; + cxt->console_size = pdata->console_size; + cxt->ftrace_size = pdata->ftrace_size; cxt->dump_oops = pdata->dump_oops; - cxt->ecc = pdata->ecc; + cxt->ecc_size = pdata->ecc_size; - cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_count, GFP_KERNEL); - if (!cxt->przs) { - err = -ENOMEM; - dev_err(dev, "failed to initialize a prz array\n"); + paddr = cxt->phys_addr; + + dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size; + err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); + if (err) goto fail_out; - } - for (i = 0; i < cxt->max_count; i++) { - size_t sz = cxt->record_size; - phys_addr_t start = cxt->phys_addr + sz * i; + err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, + cxt->console_size, 0); + if (err) + goto fail_init_cprz; - cxt->przs[i] = persistent_ram_new(start, sz, cxt->ecc); - if (IS_ERR(cxt->przs[i])) { - err = PTR_ERR(cxt->przs[i]); - dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", - sz, (unsigned long long)start, err); - goto fail_przs; - } + err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, + LINUX_VERSION_CODE); + if (err) + goto fail_init_fprz; + + if (!cxt->przs && !cxt->cprz && !cxt->fprz) { + pr_err("memory size too small, minimum is %lu\n", + cxt->console_size + cxt->record_size + + cxt->ftrace_size); + goto fail_cnt; } cxt->pstore.data = cxt; - cxt->pstore.bufsize = cxt->przs[0]->buffer_size; + /* + * Console can handle any buffer size, so prefer dumps buffer + * size since usually it is smaller. + */ + if (cxt->przs) + cxt->pstore.bufsize = cxt->przs[0]->buffer_size; + else + cxt->pstore.bufsize = cxt->cprz->buffer_size; cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); spin_lock_init(&cxt->pstore.buf_lock); if (!cxt->pstore.buf) { @@ -291,10 +443,9 @@ static int __init ramoops_probe(struct platform_device *pdev) record_size = pdata->record_size; dump_oops = pdata->dump_oops; - pr_info("attached 0x%lx@0x%llx (%ux0x%zx), ecc: %s\n", + pr_info("attached 0x%lx@0x%llx, ecc: %d\n", cxt->size, (unsigned long long)cxt->phys_addr, - cxt->max_count, cxt->record_size, - ramoops_ecc ? "on" : "off"); + cxt->ecc_size); return 0; @@ -302,11 +453,13 @@ fail_buf: kfree(cxt->pstore.buf); fail_clear: cxt->pstore.bufsize = 0; - cxt->max_count = 0; -fail_przs: - for (i = 0; cxt->przs[i]; i++) - persistent_ram_free(cxt->przs[i]); - kfree(cxt->przs); + cxt->max_dump_cnt = 0; +fail_cnt: + kfree(cxt->fprz); +fail_init_fprz: + kfree(cxt->cprz); +fail_init_cprz: + ramoops_free_przs(cxt); fail_out: return err; } @@ -321,7 +474,7 @@ static int __exit ramoops_remove(struct platform_device *pdev) iounmap(cxt->virt_addr); release_mem_region(cxt->phys_addr, cxt->size); - cxt->max_count = 0; + cxt->max_dump_cnt = 0; /* TODO(kees): When pstore supports unregistering, call it here. */ kfree(cxt->pstore.buf); @@ -333,6 +486,7 @@ static int __exit ramoops_remove(struct platform_device *pdev) } static struct platform_driver ramoops_driver = { + .probe = ramoops_probe, .remove = __exit_p(ramoops_remove), .driver = { .name = "ramoops", @@ -340,45 +494,51 @@ static struct platform_driver ramoops_driver = { }, }; -static int __init ramoops_init(void) +static void ramoops_register_dummy(void) { - int ret; - ret = platform_driver_probe(&ramoops_driver, ramoops_probe); - if (ret == -ENODEV) { - /* - * If we didn't find a platform device, we use module parameters - * building platform data on the fly. - */ - pr_info("platform device not found, using module parameters\n"); - dummy_data = kzalloc(sizeof(struct ramoops_platform_data), - GFP_KERNEL); - if (!dummy_data) - return -ENOMEM; - dummy_data->mem_size = mem_size; - dummy_data->mem_address = mem_address; - dummy_data->record_size = record_size; - dummy_data->dump_oops = dump_oops; - dummy_data->ecc = ramoops_ecc; - dummy = platform_create_bundle(&ramoops_driver, ramoops_probe, - NULL, 0, dummy_data, - sizeof(struct ramoops_platform_data)); - - if (IS_ERR(dummy)) - ret = PTR_ERR(dummy); - else - ret = 0; + if (!mem_size) + return; + + pr_info("using module parameters\n"); + + dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); + if (!dummy_data) { + pr_info("could not allocate pdata\n"); + return; + } + + dummy_data->mem_size = mem_size; + dummy_data->mem_address = mem_address; + dummy_data->record_size = record_size; + dummy_data->console_size = ramoops_console_size; + dummy_data->ftrace_size = ramoops_ftrace_size; + dummy_data->dump_oops = dump_oops; + /* + * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC + * (using 1 byte for ECC isn't much of use anyway). + */ + dummy_data->ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; + + dummy = platform_device_register_data(NULL, "ramoops", -1, + dummy_data, sizeof(struct ramoops_platform_data)); + if (IS_ERR(dummy)) { + pr_info("could not create platform device: %ld\n", + PTR_ERR(dummy)); } +} - return ret; +static int __init ramoops_init(void) +{ + ramoops_register_dummy(); + return platform_driver_register(&ramoops_driver); } +postcore_initcall(ramoops_init); static void __exit ramoops_exit(void) { platform_driver_unregister(&ramoops_driver); kfree(dummy_data); } - -module_init(ramoops_init); module_exit(ramoops_exit); MODULE_LICENSE("GPL"); diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c index c5fbdbbf81a..eecd2a8a84d 100644 --- a/fs/pstore/ram_core.c +++ b/fs/pstore/ram_core.c @@ -35,8 +35,6 @@ struct persistent_ram_buffer { #define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */ -static __initdata LIST_HEAD(persistent_ram_list); - static inline size_t buffer_size(struct persistent_ram_zone *prz) { return atomic_read(&prz->buffer->size); @@ -116,7 +114,7 @@ static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, int ecc_size = prz->ecc_size; int size = prz->ecc_block_size; - if (!prz->ecc) + if (!prz->ecc_size) return; block = buffer->data + (start & ~(ecc_block_size - 1)); @@ -135,7 +133,7 @@ static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) { struct persistent_ram_buffer *buffer = prz->buffer; - if (!prz->ecc) + if (!prz->ecc_size) return; persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer), @@ -148,7 +146,7 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) uint8_t *block; uint8_t *par; - if (!prz->ecc) + if (!prz->ecc_size) return; block = buffer->data; @@ -174,29 +172,30 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) } static int persistent_ram_init_ecc(struct persistent_ram_zone *prz, - size_t buffer_size) + int ecc_size) { int numerr; struct persistent_ram_buffer *buffer = prz->buffer; int ecc_blocks; + size_t ecc_total; + int ecc_symsize = 8; + int ecc_poly = 0x11d; - if (!prz->ecc) + if (!ecc_size) return 0; prz->ecc_block_size = 128; - prz->ecc_size = 16; - prz->ecc_symsize = 8; - prz->ecc_poly = 0x11d; + prz->ecc_size = ecc_size; ecc_blocks = DIV_ROUND_UP(prz->buffer_size, prz->ecc_block_size); - prz->buffer_size -= (ecc_blocks + 1) * prz->ecc_size; - - if (prz->buffer_size > buffer_size) { - pr_err("persistent_ram: invalid size %zu, non-ecc datasize %zu\n", - buffer_size, prz->buffer_size); + ecc_total = (ecc_blocks + 1) * prz->ecc_size; + if (ecc_total >= prz->buffer_size) { + pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n", + __func__, prz->ecc_size, ecc_total, prz->buffer_size); return -EINVAL; } + prz->buffer_size -= ecc_total; prz->par_buffer = buffer->data + prz->buffer_size; prz->par_header = prz->par_buffer + ecc_blocks * prz->ecc_size; @@ -204,8 +203,7 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz, * first consecutive root is 0 * primitive element to generate roots = 1 */ - prz->rs_decoder = init_rs(prz->ecc_symsize, prz->ecc_poly, 0, 1, - prz->ecc_size); + prz->rs_decoder = init_rs(ecc_symsize, ecc_poly, 0, 1, prz->ecc_size); if (prz->rs_decoder == NULL) { pr_info("persistent_ram: init_rs failed\n"); return -EINVAL; @@ -392,35 +390,36 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, return 0; } -static int __init persistent_ram_post_init(struct persistent_ram_zone *prz, bool ecc) +static int __devinit persistent_ram_post_init(struct persistent_ram_zone *prz, + u32 sig, int ecc_size) { int ret; - prz->ecc = ecc; - - ret = persistent_ram_init_ecc(prz, prz->buffer_size); + ret = persistent_ram_init_ecc(prz, ecc_size); if (ret) return ret; - if (prz->buffer->sig == PERSISTENT_RAM_SIG) { + sig ^= PERSISTENT_RAM_SIG; + + if (prz->buffer->sig == sig) { if (buffer_size(prz) > prz->buffer_size || buffer_start(prz) > buffer_size(prz)) pr_info("persistent_ram: found existing invalid buffer," " size %zu, start %zu\n", buffer_size(prz), buffer_start(prz)); else { - pr_info("persistent_ram: found existing buffer," + pr_debug("persistent_ram: found existing buffer," " size %zu, start %zu\n", buffer_size(prz), buffer_start(prz)); persistent_ram_save_old(prz); return 0; } } else { - pr_info("persistent_ram: no valid data in buffer" + pr_debug("persistent_ram: no valid data in buffer" " (sig = 0x%08x)\n", prz->buffer->sig); } - prz->buffer->sig = PERSISTENT_RAM_SIG; + prz->buffer->sig = sig; persistent_ram_zap(prz); return 0; @@ -428,19 +427,25 @@ static int __init persistent_ram_post_init(struct persistent_ram_zone *prz, bool void persistent_ram_free(struct persistent_ram_zone *prz) { - if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { - vunmap(prz->vaddr); - } else { - iounmap(prz->vaddr); - release_mem_region(prz->paddr, prz->size); + if (!prz) + return; + + if (prz->vaddr) { + if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { + vunmap(prz->vaddr); + } else { + iounmap(prz->vaddr); + release_mem_region(prz->paddr, prz->size); + } + prz->vaddr = NULL; } persistent_ram_free_old(prz); kfree(prz); } -struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start, - size_t size, - bool ecc) +struct persistent_ram_zone * __devinit persistent_ram_new(phys_addr_t start, + size_t size, u32 sig, + int ecc_size) { struct persistent_ram_zone *prz; int ret = -ENOMEM; @@ -455,85 +460,12 @@ struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start, if (ret) goto err; - persistent_ram_post_init(prz, ecc); - - return prz; -err: - kfree(prz); - return ERR_PTR(ret); -} - -#ifndef MODULE -static int __init persistent_ram_buffer_init(const char *name, - struct persistent_ram_zone *prz) -{ - int i; - struct persistent_ram *ram; - struct persistent_ram_descriptor *desc; - phys_addr_t start; - - list_for_each_entry(ram, &persistent_ram_list, node) { - start = ram->start; - for (i = 0; i < ram->num_descs; i++) { - desc = &ram->descs[i]; - if (!strcmp(desc->name, name)) - return persistent_ram_buffer_map(start, - desc->size, prz); - start += desc->size; - } - } - - return -EINVAL; -} - -static __init -struct persistent_ram_zone *__persistent_ram_init(struct device *dev, bool ecc) -{ - struct persistent_ram_zone *prz; - int ret = -ENOMEM; - - prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL); - if (!prz) { - pr_err("persistent_ram: failed to allocate persistent ram zone\n"); - goto err; - } - - ret = persistent_ram_buffer_init(dev_name(dev), prz); - if (ret) { - pr_err("persistent_ram: failed to initialize buffer\n"); + ret = persistent_ram_post_init(prz, sig, ecc_size); + if (ret) goto err; - } - - persistent_ram_post_init(prz, ecc); return prz; err: - kfree(prz); + persistent_ram_free(prz); return ERR_PTR(ret); } - -struct persistent_ram_zone * __init -persistent_ram_init_ringbuffer(struct device *dev, bool ecc) -{ - return __persistent_ram_init(dev, ecc); -} - -int __init persistent_ram_early_init(struct persistent_ram *ram) -{ - int ret; - - ret = memblock_reserve(ram->start, ram->size); - if (ret) { - pr_err("Failed to reserve persistent memory from %08lx-%08lx\n", - (long)ram->start, (long)(ram->start + ram->size - 1)); - return ret; - } - - list_add_tail(&ram->node, &persistent_ram_list); - - pr_info("Initialized persistent memory from %08lx-%08lx\n", - (long)ram->start, (long)(ram->start + ram->size - 1)); - - return 0; -} -#endif |