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Diffstat (limited to 'arch/ia64/sn/kernel/mca.c')
| -rw-r--r-- | arch/ia64/sn/kernel/mca.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/ia64/sn/kernel/mca.c b/arch/ia64/sn/kernel/mca.c new file mode 100644 index 000000000..bc3bd930c --- /dev/null +++ b/arch/ia64/sn/kernel/mca.c @@ -0,0 +1,144 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 2000-2006 Silicon Graphics, Inc. All Rights Reserved. + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/timer.h> +#include <linux/vmalloc.h> +#include <linux/mutex.h> +#include <asm/mca.h> +#include <asm/sal.h> +#include <asm/sn/sn_sal.h> + +/* + * Interval for calling SAL to poll for errors that do NOT cause error + * interrupts. SAL will raise a CPEI if any errors are present that + * need to be logged. + */ +#define CPEI_INTERVAL (5*HZ) + +struct timer_list sn_cpei_timer; +void sn_init_cpei_timer(void); + +/* Printing oemdata from mca uses data that is not passed through SAL, it is + * global. Only one user at a time. + */ +static DEFINE_MUTEX(sn_oemdata_mutex); +static u8 **sn_oemdata; +static u64 *sn_oemdata_size, sn_oemdata_bufsize; + +/* + * print_hook + * + * This function is the callback routine that SAL calls to log error + * info for platform errors. buf is appended to sn_oemdata, resizing as + * required. + * Note: this is a SAL to OS callback, running under the same rules as the SAL + * code. SAL calls are run with preempt disabled so this routine must not + * sleep. vmalloc can sleep so print_hook cannot resize the output buffer + * itself, instead it must set the required size and return to let the caller + * resize the buffer then redrive the SAL call. + */ +static int print_hook(const char *fmt, ...) +{ + char buf[400]; + int len; + va_list args; + va_start(args, fmt); + vsnprintf(buf, sizeof(buf), fmt, args); + va_end(args); + len = strlen(buf); + if (*sn_oemdata_size + len <= sn_oemdata_bufsize) + memcpy(*sn_oemdata + *sn_oemdata_size, buf, len); + *sn_oemdata_size += len; + return 0; +} + +static void sn_cpei_handler(int irq, void *devid, struct pt_regs *regs) +{ + /* + * this function's sole purpose is to call SAL when we receive + * a CE interrupt from SHUB or when the timer routine decides + * we need to call SAL to check for CEs. + */ + + /* CALL SAL_LOG_CE */ + + ia64_sn_plat_cpei_handler(); +} + +static void sn_cpei_timer_handler(struct timer_list *unused) +{ + sn_cpei_handler(-1, NULL, NULL); + mod_timer(&sn_cpei_timer, jiffies + CPEI_INTERVAL); +} + +void sn_init_cpei_timer(void) +{ + timer_setup(&sn_cpei_timer, sn_cpei_timer_handler, 0); + sn_cpei_timer.expires = jiffies + CPEI_INTERVAL; + add_timer(&sn_cpei_timer); +} + +static int +sn_platform_plat_specific_err_print(const u8 * sect_header, u8 ** oemdata, + u64 * oemdata_size) +{ + mutex_lock(&sn_oemdata_mutex); + sn_oemdata = oemdata; + sn_oemdata_size = oemdata_size; + sn_oemdata_bufsize = 0; + *sn_oemdata_size = PAGE_SIZE; /* first guess at how much data will be generated */ + while (*sn_oemdata_size > sn_oemdata_bufsize) { + u8 *newbuf = vmalloc(*sn_oemdata_size); + if (!newbuf) { + mutex_unlock(&sn_oemdata_mutex); + printk(KERN_ERR "%s: unable to extend sn_oemdata\n", + __func__); + return 1; + } + vfree(*sn_oemdata); + *sn_oemdata = newbuf; + sn_oemdata_bufsize = *sn_oemdata_size; + *sn_oemdata_size = 0; + ia64_sn_plat_specific_err_print(print_hook, (char *)sect_header); + } + mutex_unlock(&sn_oemdata_mutex); + return 0; +} + +/* Callback when userspace salinfo wants to decode oem data via the platform + * kernel and/or prom. + */ +int sn_salinfo_platform_oemdata(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size) +{ + efi_guid_t guid = *(efi_guid_t *)sect_header; + int valid = 0; + *oemdata_size = 0; + vfree(*oemdata); + *oemdata = NULL; + if (efi_guidcmp(guid, SAL_PLAT_SPECIFIC_ERR_SECT_GUID) == 0) { + sal_log_plat_specific_err_info_t *psei = (sal_log_plat_specific_err_info_t *)sect_header; + valid = psei->valid.oem_data; + } else if (efi_guidcmp(guid, SAL_PLAT_MEM_DEV_ERR_SECT_GUID) == 0) { + sal_log_mem_dev_err_info_t *mdei = (sal_log_mem_dev_err_info_t *)sect_header; + valid = mdei->valid.oem_data; + } + if (valid) + return sn_platform_plat_specific_err_print(sect_header, oemdata, oemdata_size); + else + return 0; +} + +static int __init sn_salinfo_init(void) +{ + if (ia64_platform_is("sn2")) + salinfo_platform_oemdata = &sn_salinfo_platform_oemdata; + return 0; +} +device_initcall(sn_salinfo_init); |