LXR linux/arch/ia64/sn/kernel/mca.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (c) 2000-2006 Silicon Graphics, Inc.  All Rights Reserved.
   7 */
   8
   9#include <linux/types.h>
  10#include <linux/kernel.h>
  11#include <linux/timer.h>
  12#include <linux/vmalloc.h>
  13#include <linux/mutex.h>
  14#include <asm/mca.h>
  15#include <asm/sal.h>
  16#include <asm/sn/sn_sal.h>
  17
  18/*
  19 * Interval for calling SAL to poll for errors that do NOT cause error
  20 * interrupts. SAL will raise a CPEI if any errors are present that
  21 * need to be logged.
  22 */
  23#define CPEI_INTERVAL   (5*HZ)
  24
  25struct timer_list sn_cpei_timer;
  26void sn_init_cpei_timer(void);
  27
  28/* Printing oemdata from mca uses data that is not passed through SAL, it is
  29 * global.  Only one user at a time.
  30 */
  31static DEFINE_MUTEX(sn_oemdata_mutex);
  32static u8 **sn_oemdata;
  33static u64 *sn_oemdata_size, sn_oemdata_bufsize;
  34
  35/*
  36 * print_hook
  37 *
  38 * This function is the callback routine that SAL calls to log error
  39 * info for platform errors.  buf is appended to sn_oemdata, resizing as
  40 * required.
  41 * Note: this is a SAL to OS callback, running under the same rules as the SAL
  42 * code.  SAL calls are run with preempt disabled so this routine must not
  43 * sleep.  vmalloc can sleep so print_hook cannot resize the output buffer
  44 * itself, instead it must set the required size and return to let the caller
  45 * resize the buffer then redrive the SAL call.
  46 */
  47static int print_hook(const char *fmt, ...)
  48{
  49        char buf[400];
  50        int len;
  51        va_list args;
  52        va_start(args, fmt);
  53        vsnprintf(buf, sizeof(buf), fmt, args);
  54        va_end(args);
  55        len = strlen(buf);
  56        if (*sn_oemdata_size + len <= sn_oemdata_bufsize)
  57                memcpy(*sn_oemdata + *sn_oemdata_size, buf, len);
  58        *sn_oemdata_size += len;
  59        return 0;
  60}
  61
  62static void sn_cpei_handler(int irq, void *devid, struct pt_regs *regs)
  63{
  64        /*
  65         * this function's sole purpose is to call SAL when we receive
  66         * a CE interrupt from SHUB or when the timer routine decides
  67         * we need to call SAL to check for CEs.
  68         */
  69
  70        /* CALL SAL_LOG_CE */
  71
  72        ia64_sn_plat_cpei_handler();
  73}
  74
  75static void sn_cpei_timer_handler(unsigned long dummy)
  76{
  77        sn_cpei_handler(-1, NULL, NULL);
  78        mod_timer(&sn_cpei_timer, jiffies + CPEI_INTERVAL);
  79}
  80
  81void sn_init_cpei_timer(void)
  82{
  83        init_timer(&sn_cpei_timer);
  84        sn_cpei_timer.expires = jiffies + CPEI_INTERVAL;
  85        sn_cpei_timer.function = sn_cpei_timer_handler;
  86        add_timer(&sn_cpei_timer);
  87}
  88
  89static int
  90sn_platform_plat_specific_err_print(const u8 * sect_header, u8 ** oemdata,
  91                                    u64 * oemdata_size)
  92{
  93        mutex_lock(&sn_oemdata_mutex);
  94        sn_oemdata = oemdata;
  95        sn_oemdata_size = oemdata_size;
  96        sn_oemdata_bufsize = 0;
  97        *sn_oemdata_size = PAGE_SIZE;   /* first guess at how much data will be generated */
  98        while (*sn_oemdata_size > sn_oemdata_bufsize) {
  99                u8 *newbuf = vmalloc(*sn_oemdata_size);
 100                if (!newbuf) {
 101                        mutex_unlock(&sn_oemdata_mutex);
 102                        printk(KERN_ERR "%s: unable to extend sn_oemdata\n",
 103                               __func__);
 104                        return 1;
 105                }
 106                vfree(*sn_oemdata);
 107                *sn_oemdata = newbuf;
 108                sn_oemdata_bufsize = *sn_oemdata_size;
 109                *sn_oemdata_size = 0;
 110                ia64_sn_plat_specific_err_print(print_hook, (char *)sect_header);
 111        }
 112        mutex_unlock(&sn_oemdata_mutex);
 113        return 0;
 114}
 115
 116/* Callback when userspace salinfo wants to decode oem data via the platform
 117 * kernel and/or prom.
 118 */
 119int sn_salinfo_platform_oemdata(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size)
 120{
 121        efi_guid_t guid = *(efi_guid_t *)sect_header;
 122        int valid = 0;
 123        *oemdata_size = 0;
 124        vfree(*oemdata);
 125        *oemdata = NULL;
 126        if (efi_guidcmp(guid, SAL_PLAT_SPECIFIC_ERR_SECT_GUID) == 0) {
 127                sal_log_plat_specific_err_info_t *psei = (sal_log_plat_specific_err_info_t *)sect_header;
 128                valid = psei->valid.oem_data;
 129        } else if (efi_guidcmp(guid, SAL_PLAT_MEM_DEV_ERR_SECT_GUID) == 0) {
 130                sal_log_mem_dev_err_info_t *mdei = (sal_log_mem_dev_err_info_t *)sect_header;
 131                valid = mdei->valid.oem_data;
 132        }
 133        if (valid)
 134                return sn_platform_plat_specific_err_print(sect_header, oemdata, oemdata_size);
 135        else
 136                return 0;
 137}
 138
 139static int __init sn_salinfo_init(void)
 140{
 141        if (ia64_platform_is("sn2"))
 142                salinfo_platform_oemdata = &sn_salinfo_platform_oemdata;
 143        return 0;
 144}
 145device_initcall(sn_salinfo_init);
 146