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
  25 struct timer_list sn_cpei_timer;
  26 void 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  */
  31 static DEFINE_MUTEX(sn_oemdata_mutex);
  32 static u8 **sn_oemdata;
  33 static 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  */
  47 static 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
  62 static 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
  75 static 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
  81 void 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
  89 static int
  90 sn_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  */
 119 int 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
 139 static 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 }
 145
 146 module_init(sn_salinfo_init)