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ioerror.h
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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 */
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