diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/nvram.h | 52 | ||||
| -rw-r--r-- | arch/powerpc/kernel/nvram_64.c | 481 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/chrp/time.c | 4 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/nvram.c | 205 |
5 files changed, 381 insertions, 363 deletions
diff --git a/arch/powerpc/include/asm/nvram.h b/arch/powerpc/include/asm/nvram.h index 850b72f..92efe67 100644 --- a/arch/powerpc/include/asm/nvram.h +++ b/arch/powerpc/include/asm/nvram.h @@ -10,31 +10,7 @@ #ifndef _ASM_POWERPC_NVRAM_H #define _ASM_POWERPC_NVRAM_H -#include <linux/errno.h> - -#define NVRW_CNT 0x20 -#define NVRAM_HEADER_LEN 16 /* sizeof(struct nvram_header) */ -#define NVRAM_BLOCK_LEN 16 -#define NVRAM_MAX_REQ (2080/NVRAM_BLOCK_LEN) -#define NVRAM_MIN_REQ (1056/NVRAM_BLOCK_LEN) - -#define NVRAM_AS0 0x74 -#define NVRAM_AS1 0x75 -#define NVRAM_DATA 0x77 - - -/* RTC Offsets */ - -#define MOTO_RTC_SECONDS 0x1FF9 -#define MOTO_RTC_MINUTES 0x1FFA -#define MOTO_RTC_HOURS 0x1FFB -#define MOTO_RTC_DAY_OF_WEEK 0x1FFC -#define MOTO_RTC_DAY_OF_MONTH 0x1FFD -#define MOTO_RTC_MONTH 0x1FFE -#define MOTO_RTC_YEAR 0x1FFF -#define MOTO_RTC_CONTROLA 0x1FF8 -#define MOTO_RTC_CONTROLB 0x1FF9 - +/* Signatures for nvram partitions */ #define NVRAM_SIG_SP 0x02 /* support processor */ #define NVRAM_SIG_OF 0x50 /* open firmware config */ #define NVRAM_SIG_FW 0x51 /* general firmware */ @@ -49,32 +25,19 @@ #define NVRAM_SIG_OS 0xa0 /* OS defined */ #define NVRAM_SIG_PANIC 0xa1 /* Apple OSX "panic" */ -/* If change this size, then change the size of NVNAME_LEN */ -struct nvram_header { - unsigned char signature; - unsigned char checksum; - unsigned short length; - char name[12]; -}; - #ifdef __KERNEL__ +#include <linux/errno.h> #include <linux/list.h> -struct nvram_partition { - struct list_head partition; - struct nvram_header header; - unsigned int index; -}; - - +#ifdef CONFIG_PPC_PSERIES extern int nvram_write_error_log(char * buff, int length, unsigned int err_type, unsigned int err_seq); extern int nvram_read_error_log(char * buff, int length, unsigned int * err_type, unsigned int *err_seq); extern int nvram_clear_error_log(void); - extern int pSeries_nvram_init(void); +#endif /* CONFIG_PPC_PSERIES */ #ifdef CONFIG_MMIO_NVRAM extern int mmio_nvram_init(void); @@ -85,6 +48,13 @@ static inline int mmio_nvram_init(void) } #endif +extern int __init nvram_scan_partitions(void); +extern loff_t nvram_create_partition(const char *name, int sig, + int req_size, int min_size); +extern int nvram_remove_partition(const char *name, int sig); +extern int nvram_get_partition_size(loff_t data_index); +extern loff_t nvram_find_partition(const char *name, int sig, int *out_size); + #endif /* __KERNEL__ */ /* PowerMac specific nvram stuffs */ diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c index 9cf197f..bb12b32 100644 --- a/arch/powerpc/kernel/nvram_64.c +++ b/arch/powerpc/kernel/nvram_64.c @@ -34,15 +34,26 @@ #undef DEBUG_NVRAM -static struct nvram_partition * nvram_part; -static long nvram_error_log_index = -1; -static long nvram_error_log_size = 0; +#define NVRAM_HEADER_LEN sizeof(struct nvram_header) +#define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN + +/* If change this size, then change the size of NVNAME_LEN */ +struct nvram_header { + unsigned char signature; + unsigned char checksum; + unsigned short length; + /* Terminating null required only for names < 12 chars. */ + char name[12]; +}; -struct err_log_info { - int error_type; - unsigned int seq_num; +struct nvram_partition { + struct list_head partition; + struct nvram_header header; + unsigned int index; }; +static LIST_HEAD(nvram_partitions); + static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin) { int size; @@ -186,14 +197,12 @@ static struct miscdevice nvram_dev = { #ifdef DEBUG_NVRAM static void __init nvram_print_partitions(char * label) { - struct list_head * p; struct nvram_partition * tmp_part; printk(KERN_WARNING "--------%s---------\n", label); printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); - list_for_each(p, &nvram_part->partition) { - tmp_part = list_entry(p, struct nvram_partition, partition); - printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%s\n", + list_for_each_entry(tmp_part, &nvram_partitions, partition) { + printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12s\n", tmp_part->index, tmp_part->header.signature, tmp_part->header.checksum, tmp_part->header.length, tmp_part->header.name); @@ -228,95 +237,113 @@ static unsigned char __init nvram_checksum(struct nvram_header *p) return c_sum; } -static int __init nvram_remove_os_partition(void) +/** + * nvram_remove_partition - Remove one or more partitions in nvram + * @name: name of the partition to remove, or NULL for a + * signature only match + * @sig: signature of the partition(s) to remove + */ + +int __init nvram_remove_partition(const char *name, int sig) { - struct list_head *i; - struct list_head *j; - struct nvram_partition * part; - struct nvram_partition * cur_part; + struct nvram_partition *part, *prev, *tmp; int rc; - list_for_each(i, &nvram_part->partition) { - part = list_entry(i, struct nvram_partition, partition); - if (part->header.signature != NVRAM_SIG_OS) + list_for_each_entry(part, &nvram_partitions, partition) { + if (part->header.signature != sig) continue; - - /* Make os partition a free partition */ + if (name && strncmp(name, part->header.name, 12)) + continue; + + /* Make partition a free partition */ part->header.signature = NVRAM_SIG_FREE; - sprintf(part->header.name, "wwwwwwwwwwww"); + strncpy(part->header.name, "wwwwwwwwwwww", 12); part->header.checksum = nvram_checksum(&part->header); - - /* Merge contiguous free partitions backwards */ - list_for_each_prev(j, &part->partition) { - cur_part = list_entry(j, struct nvram_partition, partition); - if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) { - break; - } - - part->header.length += cur_part->header.length; - part->header.checksum = nvram_checksum(&part->header); - part->index = cur_part->index; - - list_del(&cur_part->partition); - kfree(cur_part); - j = &part->partition; /* fixup our loop */ - } - - /* Merge contiguous free partitions forwards */ - list_for_each(j, &part->partition) { - cur_part = list_entry(j, struct nvram_partition, partition); - if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) { - break; - } - - part->header.length += cur_part->header.length; - part->header.checksum = nvram_checksum(&part->header); - - list_del(&cur_part->partition); - kfree(cur_part); - j = &part->partition; /* fixup our loop */ - } - rc = nvram_write_header(part); if (rc <= 0) { - printk(KERN_ERR "nvram_remove_os_partition: nvram_write failed (%d)\n", rc); + printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); return rc; } + } + /* Merge contiguous ones */ + prev = NULL; + list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) { + if (part->header.signature != NVRAM_SIG_FREE) { + prev = NULL; + continue; + } + if (prev) { + prev->header.length += part->header.length; + prev->header.checksum = nvram_checksum(&part->header); + rc = nvram_write_header(part); + if (rc <= 0) { + printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); + return rc; + } + list_del(&part->partition); + kfree(part); + } else + prev = part; } return 0; } -/* nvram_create_os_partition +/** + * nvram_create_partition - Create a partition in nvram + * @name: name of the partition to create + * @sig: signature of the partition to create + * @req_size: size of data to allocate in bytes + * @min_size: minimum acceptable size (0 means req_size) * - * Create a OS linux partition to buffer error logs. - * Will create a partition starting at the first free - * space found if space has enough room. + * Returns a negative error code or a positive nvram index + * of the beginning of the data area of the newly created + * partition. If you provided a min_size smaller than req_size + * you need to query for the actual size yourself after the + * call using nvram_partition_get_size(). */ -static int __init nvram_create_os_partition(void) +loff_t __init nvram_create_partition(const char *name, int sig, + int req_size, int min_size) { struct nvram_partition *part; struct nvram_partition *new_part; struct nvram_partition *free_part = NULL; - int seq_init[2] = { 0, 0 }; + static char nv_init_vals[16]; loff_t tmp_index; long size = 0; int rc; - + + /* Convert sizes from bytes to blocks */ + req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; + min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; + + /* If no minimum size specified, make it the same as the + * requested size + */ + if (min_size == 0) + min_size = req_size; + if (min_size > req_size) + return -EINVAL; + + /* Now add one block to each for the header */ + req_size += 1; + min_size += 1; + /* Find a free partition that will give us the maximum needed size If can't find one that will give us the minimum size needed */ - list_for_each_entry(part, &nvram_part->partition, partition) { + list_for_each_entry(part, &nvram_partitions, partition) { if (part->header.signature != NVRAM_SIG_FREE) continue; - if (part->header.length >= NVRAM_MAX_REQ) { - size = NVRAM_MAX_REQ; + if (part->header.length >= req_size) { + size = req_size; free_part = part; break; } - if (!size && part->header.length >= NVRAM_MIN_REQ) { - size = NVRAM_MIN_REQ; + if (part->header.length > size && + part->header.length >= min_size) { + size = part->header.length; free_part = part; } } @@ -326,136 +353,95 @@ static int __init nvram_create_os_partition(void) /* Create our OS partition */ new_part = kmalloc(sizeof(*new_part), GFP_KERNEL); if (!new_part) { - printk(KERN_ERR "nvram_create_os_partition: kmalloc failed\n"); + pr_err("nvram_create_os_partition: kmalloc failed\n"); return -ENOMEM; } new_part->index = free_part->index; - new_part->header.signature = NVRAM_SIG_OS; + new_part->header.signature = sig; new_part->header.length = size; - strcpy(new_part->header.name, "ppc64,linux"); + strncpy(new_part->header.name, name, 12); new_part->header.checksum = nvram_checksum(&new_part->header); rc = nvram_write_header(new_part); if (rc <= 0) { - printk(KERN_ERR "nvram_create_os_partition: nvram_write_header " - "failed (%d)\n", rc); - return rc; - } - - /* make sure and initialize to zero the sequence number and the error - type logged */ - tmp_index = new_part->index + NVRAM_HEADER_LEN; - rc = ppc_md.nvram_write((char *)&seq_init, sizeof(seq_init), &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_create_os_partition: nvram_write " + pr_err("nvram_create_os_partition: nvram_write_header " "failed (%d)\n", rc); return rc; } - - nvram_error_log_index = new_part->index + NVRAM_HEADER_LEN; - nvram_error_log_size = ((part->header.length - 1) * - NVRAM_BLOCK_LEN) - sizeof(struct err_log_info); - list_add_tail(&new_part->partition, &free_part->partition); - if (free_part->header.length <= size) { + /* Adjust or remove the partition we stole the space from */ + if (free_part->header.length > size) { + free_part->index += size * NVRAM_BLOCK_LEN; + free_part->header.length -= size; + free_part->header.checksum = nvram_checksum(&free_part->header); + rc = nvram_write_header(free_part); + if (rc <= 0) { + pr_err("nvram_create_os_partition: nvram_write_header " + "failed (%d)\n", rc); + return rc; + } + } else { list_del(&free_part->partition); kfree(free_part); - return 0; } - /* Adjust the partition we stole the space from */ - free_part->index += size * NVRAM_BLOCK_LEN; - free_part->header.length -= size; - free_part->header.checksum = nvram_checksum(&free_part->header); - - rc = nvram_write_header(free_part); - if (rc <= 0) { - printk(KERN_ERR "nvram_create_os_partition: nvram_write_header " - "failed (%d)\n", rc); - return rc; + /* Clear the new partition */ + for (tmp_index = new_part->index + NVRAM_HEADER_LEN; + tmp_index < ((size - 1) * NVRAM_BLOCK_LEN); + tmp_index += NVRAM_BLOCK_LEN) { + rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index); + if (rc <= 0) { + pr_err("nvram_create_partition: nvram_write failed (%d)\n", rc); + return rc; + } } - - return 0; + + return new_part->index + NVRAM_HEADER_LEN; } - -/* nvram_setup_partition - * - * This will setup the partition we need for buffering the - * error logs and cleanup partitions if needed. - * - * The general strategy is the following: - * 1.) If there is ppc64,linux partition large enough then use it. - * 2.) If there is not a ppc64,linux partition large enough, search - * for a free partition that is large enough. - * 3.) If there is not a free partition large enough remove - * _all_ OS partitions and consolidate the space. - * 4.) Will first try getting a chunk that will satisfy the maximum - * error log size (NVRAM_MAX_REQ). - * 5.) If the max chunk cannot be allocated then try finding a chunk - * that will satisfy the minum needed (NVRAM_MIN_REQ). +/** + * nvram_get_partition_size - Get the data size of an nvram partition + * @data_index: This is the offset of the start of the data of + * the partition. The same value that is returned by + * nvram_create_partition(). */ -static int __init nvram_setup_partition(void) +int nvram_get_partition_size(loff_t data_index) { - struct list_head * p; - struct nvram_partition * part; - int rc; - - /* For now, we don't do any of this on pmac, until I - * have figured out if it's worth killing some unused stuffs - * in our nvram, as Apple defined partitions use pretty much - * all of the space - */ - if (machine_is(powermac)) - return -ENOSPC; - - /* see if we have an OS partition that meets our needs. - will try getting the max we need. If not we'll delete - partitions and try again. */ - list_for_each(p, &nvram_part->partition) { - part = list_entry(p, struct nvram_partition, partition); - if (part->header.signature != NVRAM_SIG_OS) - continue; + struct nvram_partition *part; + + list_for_each_entry(part, &nvram_partitions, partition) { + if (part->index + NVRAM_HEADER_LEN == data_index) + return (part->header.length - 1) * NVRAM_BLOCK_LEN; + } + return -1; +} - if (strcmp(part->header.name, "ppc64,linux")) - continue; - if (part->header.length >= NVRAM_MIN_REQ) { - /* found our partition */ - nvram_error_log_index = part->index + NVRAM_HEADER_LEN; - nvram_error_log_size = ((part->header.length - 1) * - NVRAM_BLOCK_LEN) - sizeof(struct err_log_info); - return 0; +/** + * nvram_find_partition - Find an nvram partition by signature and name + * @name: Name of the partition or NULL for any name + * @sig: Signature to test against + * @out_size: if non-NULL, returns the size of the data part of the partition + */ +loff_t nvram_find_partition(const char *name, int sig, int *out_size) +{ + struct nvram_partition *p; + + list_for_each_entry(p, &nvram_partitions, partition) { + if (p->header.signature == sig && + (!name || !strncmp(p->header.name, name, 12))) { + if (out_size) + *out_size = (p->header.length - 1) * + NVRAM_BLOCK_LEN; + return p->index + NVRAM_HEADER_LEN; } } - - /* try creating a partition with the free space we have */ - rc = nvram_create_os_partition(); - if (!rc) { - return 0; - } - - /* need to free up some space */ - rc = nvram_remove_os_partition(); - if (rc) { - return rc; - } - - /* create a partition in this new space */ - rc = nvram_create_os_partition(); - if (rc) { - printk(KERN_ERR "nvram_create_os_partition: Could not find a " - "NVRAM partition large enough\n"); - return rc; - } - return 0; } - -static int __init nvram_scan_partitions(void) +int __init nvram_scan_partitions(void) { loff_t cur_index = 0; struct nvram_header phead; @@ -465,7 +451,7 @@ static int __init nvram_scan_partitions(void) int total_size; int err; - if (ppc_md.nvram_size == NULL) + if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) return -ENODEV; total_size = ppc_md.nvram_size(); @@ -512,12 +498,16 @@ static int __init nvram_scan_partitions(void) memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); tmp_part->index = cur_index; - list_add_tail(&tmp_part->partition, &nvram_part->partition); + list_add_tail(&tmp_part->partition, &nvram_partitions); cur_index += phead.length * NVRAM_BLOCK_LEN; } err = 0; +#ifdef DEBUG_NVRAM + nvram_print_partitions("NVRAM Partitions"); +#endif + out: kfree(header); return err; @@ -525,9 +515,10 @@ static int __init nvram_scan_partitions(void) static int __init nvram_init(void) { - int error; int rc; + BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); + if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) return -ENODEV; @@ -537,29 +528,6 @@ static int __init nvram_init(void) return rc; } - /* initialize our anchor for the nvram partition list */ - nvram_part = kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); - if (!nvram_part) { - printk(KERN_ERR "nvram_init: Failed kmalloc\n"); - return -ENOMEM; - } - INIT_LIST_HEAD(&nvram_part->partition); - - /* Get all the NVRAM partitions */ - error = nvram_scan_partitions(); - if (error) { - printk(KERN_ERR "nvram_init: Failed nvram_scan_partitions\n"); - return error; - } - - if(nvram_setup_partition()) - printk(KERN_WARNING "nvram_init: Could not find nvram partition" - " for nvram buffered error logging.\n"); - -#ifdef DEBUG_NVRAM - nvram_print_partitions("NVRAM Partitions"); -#endif - return rc; } @@ -568,135 +536,6 @@ void __exit nvram_cleanup(void) misc_deregister( &nvram_dev ); } - -#ifdef CONFIG_PPC_PSERIES - -/* nvram_write_error_log - * - * We need to buffer the error logs into nvram to ensure that we have - * the failure information to decode. If we have a severe error there - * is no way to guarantee that the OS or the machine is in a state to - * get back to user land and write the error to disk. For example if - * the SCSI device driver causes a Machine Check by writing to a bad - * IO address, there is no way of guaranteeing that the device driver - * is in any state that is would also be able to write the error data - * captured to disk, thus we buffer it in NVRAM for analysis on the - * next boot. - * - * In NVRAM the partition containing the error log buffer will looks like: - * Header (in bytes): - * +-----------+----------+--------+------------+------------------+ - * | signature | checksum | length | name | data | - * |0 |1 |2 3|4 15|16 length-1| - * +-----------+----------+--------+------------+------------------+ - * - * The 'data' section would look like (in bytes): - * +--------------+------------+-----------------------------------+ - * | event_logged | sequence # | error log | - * |0 3|4 7|8 nvram_error_log_size-1| - * +--------------+------------+-----------------------------------+ - * - * event_logged: 0 if event has not been logged to syslog, 1 if it has - * sequence #: The unique sequence # for each event. (until it wraps) - * error log: The error log from event_scan - */ -int nvram_write_error_log(char * buff, int length, - unsigned int err_type, unsigned int error_log_cnt) -{ - int rc; - loff_t tmp_index; - struct err_log_info info; - - if (nvram_error_log_index == -1) { - return -ESPIPE; - } - - if (length > nvram_error_log_size) { - length = nvram_error_log_size; - } - - info.error_type = err_type; - info.seq_num = error_log_cnt; - - tmp_index = nvram_error_log_index; - - rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc); - return rc; - } - - rc = ppc_md.nvram_write(buff, length, &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc); - return rc; - } - - return 0; -} - -/* nvram_read_error_log - * - * Reads nvram for error log for at most 'length' - */ -int nvram_read_error_log(char * buff, int length, - unsigned int * err_type, unsigned int * error_log_cnt) -{ - int rc; - loff_t tmp_index; - struct err_log_info info; - - if (nvram_error_log_index == -1) - return -1; - - if (length > nvram_error_log_size) - length = nvram_error_log_size; - - tmp_index = nvram_error_log_index; - - rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc); - return rc; - } - - rc = ppc_md.nvram_read(buff, length, &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc); - return rc; - } - - *error_log_cnt = info.seq_num; - *err_type = info.error_type; - - return 0; -} - -/* This doesn't actually zero anything, but it sets the event_logged - * word to tell that this event is safely in syslog. - */ -int nvram_clear_error_log(void) -{ - loff_t tmp_index; - int clear_word = ERR_FLAG_ALREADY_LOGGED; - int rc; - - if (nvram_error_log_index == -1) - return -1; - - tmp_index = nvram_error_log_index; - - rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index); - if (rc <= 0) { - printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc); - return rc; - } - - return 0; -} - -#endif /* CONFIG_PPC_PSERIES */ - module_init(nvram_init); module_exit(nvram_cleanup); MODULE_LICENSE("GPL"); diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index 2c7e801..6a3997f 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c @@ -92,7 +92,7 @@ static void pte_free_rcu_callback(struct rcu_head *head) static void pte_free_submit(struct pte_freelist_batch *batch) { - call_rcu(&batch->rcu, pte_free_rcu_callback); + call_rcu_sched(&batch->rcu, pte_free_rcu_callback); } void pgtable_free_tlb(struct mmu_gather *tlb, void *table, unsigned shift) diff --git a/arch/powerpc/platforms/chrp/time.c b/arch/powerpc/platforms/chrp/time.c index 054dfe5..f803f4b 100644 --- a/arch/powerpc/platforms/chrp/time.c +++ b/arch/powerpc/platforms/chrp/time.c @@ -29,6 +29,10 @@ extern spinlock_t rtc_lock; +#define NVRAM_AS0 0x74 +#define NVRAM_AS1 0x75 +#define NVRAM_DATA 0x77 + static int nvram_as1 = NVRAM_AS1; static int nvram_as0 = NVRAM_AS0; static int nvram_data = NVRAM_DATA; diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c index bc3c7f2..7e828ba 100644 --- a/arch/powerpc/platforms/pseries/nvram.c +++ b/arch/powerpc/platforms/pseries/nvram.c @@ -22,11 +22,25 @@ #include <asm/prom.h> #include <asm/machdep.h> +/* Max bytes to read/write in one go */ +#define NVRW_CNT 0x20 + static unsigned int nvram_size; static int nvram_fetch, nvram_store; static char nvram_buf[NVRW_CNT]; /* assume this is in the first 4GB */ static DEFINE_SPINLOCK(nvram_lock); +static long nvram_error_log_index = -1; +static long nvram_error_log_size = 0; + +struct err_log_info { + int error_type; + unsigned int seq_num; +}; +#define NVRAM_MAX_REQ 2079 +#define NVRAM_MIN_REQ 1055 + +#define NVRAM_LOG_PART_NAME "ibm,rtas-log" static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index) { @@ -119,6 +133,197 @@ static ssize_t pSeries_nvram_get_size(void) return nvram_size ? nvram_size : -ENODEV; } + +/* nvram_write_error_log + * + * We need to buffer the error logs into nvram to ensure that we have + * the failure information to decode. If we have a severe error there + * is no way to guarantee that the OS or the machine is in a state to + * get back to user land and write the error to disk. For example if + * the SCSI device driver causes a Machine Check by writing to a bad + * IO address, there is no way of guaranteeing that the device driver + * is in any state that is would also be able to write the error data + * captured to disk, thus we buffer it in NVRAM for analysis on the + * next boot. + * + * In NVRAM the partition containing the error log buffer will looks like: + * Header (in bytes): + * +-----------+----------+--------+------------+------------------+ + * | signature | checksum | length | name | data | + * |0 |1 |2 3|4 15|16 length-1| + * +-----------+----------+--------+------------+------------------+ + * + * The 'data' section would look like (in bytes): + * +--------------+------------+-----------------------------------+ + * | event_logged | sequence # | error log | + * |0 3|4 7|8 nvram_error_log_size-1| + * +--------------+------------+-----------------------------------+ + * + * event_logged: 0 if event has not been logged to syslog, 1 if it has + * sequence #: The unique sequence # for each event. (until it wraps) + * error log: The error log from event_scan + */ +int nvram_write_error_log(char * buff, int length, + unsigned int err_type, unsigned int error_log_cnt) +{ + int rc; + loff_t tmp_index; + struct err_log_info info; + + if (nvram_error_log_index == -1) { + return -ESPIPE; + } + + if (length > nvram_error_log_size) { + length = nvram_error_log_size; + } + + info.error_type = err_type; + info.seq_num = error_log_cnt; + + tmp_index = nvram_error_log_index; + + rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc); + return rc; + } + + rc = ppc_md.nvram_write(buff, length, &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc); + return rc; + } + + return 0; +} + +/* nvram_read_error_log + * + * Reads nvram for error log for at most 'length' + */ +int nvram_read_error_log(char * buff, int length, + unsigned int * err_type, unsigned int * error_log_cnt) +{ + int rc; + loff_t tmp_index; + struct err_log_info info; + + if (nvram_error_log_index == -1) + return -1; + + if (length > nvram_error_log_size) + length = nvram_error_log_size; + + tmp_index = nvram_error_log_index; + + rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc); + return rc; + } + + rc = ppc_md.nvram_read(buff, length, &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc); + return rc; + } + + *error_log_cnt = info.seq_num; + *err_type = info.error_type; + + return 0; +} + +/* This doesn't actually zero anything, but it sets the event_logged + * word to tell that this event is safely in syslog. + */ +int nvram_clear_error_log(void) +{ + loff_t tmp_index; + int clear_word = ERR_FLAG_ALREADY_LOGGED; + int rc; + + if (nvram_error_log_index == -1) + return -1; + + tmp_index = nvram_error_log_index; + + rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index); + if (rc <= 0) { + printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc); + return rc; + } + + return 0; +} + +/* pseries_nvram_init_log_partition + * + * This will setup the partition we need for buffering the + * error logs and cleanup partitions if needed. + * + * The general strategy is the following: + * 1.) If there is log partition large enough then use it. + * 2.) If there is none large enough, search + * for a free partition that is large enough. + * 3.) If there is not a free partition large enough remove + * _all_ OS partitions and consolidate the space. + * 4.) Will first try getting a chunk that will satisfy the maximum + * error log size (NVRAM_MAX_REQ). + * 5.) If the max chunk cannot be allocated then try finding a chunk + * that will satisfy the minum needed (NVRAM_MIN_REQ). + */ +static int __init pseries_nvram_init_log_partition(void) +{ + loff_t p; + int size; + + /* Scan nvram for partitions */ + nvram_scan_partitions(); + + /* Lookg for ours */ + p = nvram_find_partition(NVRAM_LOG_PART_NAME, NVRAM_SIG_OS, &size); + + /* Found one but too small, remove it */ + if (p && size < NVRAM_MIN_REQ) { + pr_info("nvram: Found too small "NVRAM_LOG_PART_NAME" partition" + ",removing it..."); + nvram_remove_partition(NVRAM_LOG_PART_NAME, NVRAM_SIG_OS); + p = 0; + } + + /* Create one if we didn't find */ + if (!p) { + p = nvram_create_partition(NVRAM_LOG_PART_NAME, NVRAM_SIG_OS, + NVRAM_MAX_REQ, NVRAM_MIN_REQ); + /* No room for it, try to get rid of any OS partition + * and try again + */ + if (p == -ENOSPC) { + pr_info("nvram: No room to create "NVRAM_LOG_PART_NAME + " partition, deleting all OS partitions..."); + nvram_remove_partition(NULL, NVRAM_SIG_OS); + p = nvram_create_partition(NVRAM_LOG_PART_NAME, + NVRAM_SIG_OS, NVRAM_MAX_REQ, + NVRAM_MIN_REQ); + } + } + + if (p <= 0) { + pr_err("nvram: Failed to find or create "NVRAM_LOG_PART_NAME + " partition, err %d\n", (int)p); + return 0; + } + + nvram_error_log_index = p; + nvram_error_log_size = nvram_get_partition_size(p) - + sizeof(struct err_log_info); + + return 0; +} +machine_arch_initcall(pseries, pseries_nvram_init_log_partition); + int __init pSeries_nvram_init(void) { struct device_node *nvram; |