arch/ia64/sn/include/ioerror.h

   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) 1992 - 1997, 2000-2003 Silicon Graphics, Inc. All rights reserved.
   7  */
   8 #ifndef _ASM_IA64_SN_IOERROR_H
   9 #define _ASM_IA64_SN_IOERROR_H
  10
  11 /*
  12  * IO error structure.
  13  *
  14  * This structure would expand to hold the information retrieved from
  15  * all IO related error registers.
  16  *
  17  * This structure is defined to hold all system specific
  18  * information related to a single error.
  19  *
  20  * This serves a couple of purpose.
  21  *      - Error handling often involves translating one form of address to other
  22  *        form. So, instead of having different data structures at each level,
  23  *        we have a single structure, and the appropriate fields get filled in
  24  *        at each layer.
  25  *      - This provides a way to dump all error related information in any layer
  26  *        of erorr handling (debugging aid).
  27  *
  28  * A second possibility is to allow each layer to define its own error
  29  * data structure, and fill in the proper fields. This has the advantage
  30  * of isolating the layers.
  31  * A big concern is the potential stack usage (and overflow), if each layer
  32  * defines these structures on stack (assuming we don't want to do kmalloc.
  33  *
  34  * Any layer wishing to pass extra information to a layer next to it in
  35  * error handling hierarchy, can do so as a separate parameter.
  36  */
  37
  38 typedef struct io_error_s {
  39     /* Bit fields indicating which structure fields are valid */
  40     union {
  41         struct {
  42             unsigned                ievb_errortype:1;
  43             unsigned                ievb_widgetnum:1;
  44             unsigned                ievb_widgetdev:1;
  45             unsigned                ievb_srccpu:1;
  46             unsigned                ievb_srcnode:1;
  47             unsigned                ievb_errnode:1;
  48             unsigned                ievb_sysioaddr:1;
  49             unsigned                ievb_xtalkaddr:1;
  50             unsigned                ievb_busspace:1;
  51             unsigned                ievb_busaddr:1;
  52             unsigned                ievb_vaddr:1;
  53             unsigned                ievb_memaddr:1;
  54             unsigned                ievb_epc:1;
  55             unsigned                ievb_ef:1;
  56             unsigned                ievb_tnum:1;
  57         } iev_b;
  58         unsigned                iev_a;
  59     } ie_v;
  60
  61     short                   ie_errortype;       /* error type: extra info about error */
  62     short                   ie_widgetnum;       /* Widget number that's in error */
  63     short                   ie_widgetdev;       /* Device within widget in error */
  64     cpuid_t                 ie_srccpu;  /* CPU on srcnode generating error */
  65     cnodeid_t               ie_srcnode;         /* Node which caused the error   */
  66     cnodeid_t               ie_errnode;         /* Node where error was noticed  */
  67     iopaddr_t               ie_sysioaddr;       /* Sys specific IO address       */
  68     iopaddr_t               ie_xtalkaddr;       /* Xtalk (48bit) addr of Error   */
  69     iopaddr_t               ie_busspace;        /* Bus specific address space    */
  70     iopaddr_t               ie_busaddr;         /* Bus specific address          */
  71     caddr_t                 ie_vaddr;   /* Virtual address of error      */
  72     iopaddr_t               ie_memaddr;         /* Physical memory address       */
  73     caddr_t                 ie_epc;             /* pc when error reported        */
  74     caddr_t                 ie_ef;              /* eframe when error reported    */
  75     short                   ie_tnum;            /* Xtalk TNUM field */
  76 } ioerror_t;
  77
  78 #define IOERROR_INIT(e)         do { (e)->ie_v.iev_a = 0; } while (0)
  79 #define IOERROR_SETVALUE(e,f,v) do { (e)->ie_ ## f = (v); (e)->ie_v.iev_b.ievb_ ## f = 1; } while (0)
  80
  81 #endif /* _ASM_IA64_SN_IOERROR_H */