drivers/acpi/apei/cper.c

   1 /*
   2  * UEFI Common Platform Error Record (CPER) support
   3  *
   4  * Copyright (C) 2010, Intel Corp.
   5  *      Author: Huang Ying <ying.huang@intel.com>
   6  *
   7  * CPER is the format used to describe platform hardware error by
   8  * various APEI tables, such as ERST, BERT and HEST etc.
   9  *
  10  * For more information about CPER, please refer to Appendix N of UEFI
  11  * Specification version 2.3.
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License version
  15  * 2 as published by the Free Software Foundation.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/time.h>
  30 #include <linux/cper.h>
  31 #include <linux/acpi.h>
  32
  33 /*
  34  * CPER record ID need to be unique even after reboot, because record
  35  * ID is used as index for ERST storage, while CPER records from
  36  * multiple boot may co-exist in ERST.
  37  */
  38 u64 cper_next_record_id(void)
  39 {
  40         static atomic64_t seq;
  41
  42         if (!atomic64_read(&seq))
  43                 atomic64_set(&seq, ((u64)get_seconds()) << 32);
  44
  45         return atomic64_inc_return(&seq);
  46 }
  47 EXPORT_SYMBOL_GPL(cper_next_record_id);
  48
  49 int apei_estatus_check_header(const struct acpi_hest_generic_status *estatus)
  50 {
  51         if (estatus->data_length &&
  52             estatus->data_length < sizeof(struct acpi_hest_generic_data))
  53                 return -EINVAL;
  54         if (estatus->raw_data_length &&
  55             estatus->raw_data_offset < sizeof(*estatus) + estatus->data_length)
  56                 return -EINVAL;
  57
  58         return 0;
  59 }
  60 EXPORT_SYMBOL_GPL(apei_estatus_check_header);
  61
  62 int apei_estatus_check(const struct acpi_hest_generic_status *estatus)
  63 {
  64         struct acpi_hest_generic_data *gdata;
  65         unsigned int data_len, gedata_len;
  66         int rc;
  67
  68         rc = apei_estatus_check_header(estatus);
  69         if (rc)
  70                 return rc;
  71         data_len = estatus->data_length;
  72         gdata = (struct acpi_hest_generic_data *)(estatus + 1);
  73         while (data_len > sizeof(*gdata)) {
  74                 gedata_len = gdata->error_data_length;
  75                 if (gedata_len > data_len - sizeof(*gdata))
  76                         return -EINVAL;
  77                 data_len -= gedata_len + sizeof(*gdata);
  78         }
  79         if (data_len)
  80                 return -EINVAL;
  81
  82         return 0;
  83 }
  84 EXPORT_SYMBOL_GPL(apei_estatus_check);