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err_ev6.c
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1 /*
2  * linux/arch/alpha/kernel/err_ev6.c
3  *
4  * Copyright (C) 2000 Jeff Wiedemeier (Compaq Computer Corporation)
5  *
6  * Error handling code supporting Alpha systems
7  */
8 
9 #include <linux/init.h>
10 #include <linux/sched.h>
11 
12 #include <asm/io.h>
13 #include <asm/irq_regs.h>
14 #include <asm/hwrpb.h>
15 #include <asm/smp.h>
16 #include <asm/err_common.h>
17 #include <asm/err_ev6.h>
18 
19 #include "err_impl.h"
20 #include "proto.h"
21 
22 static int
23 ev6_parse_ibox(u64 i_stat, int print)
24 {
25  int status = MCHK_DISPOSITION_REPORT;
26 
27 #define EV6__I_STAT__PAR (1UL << 29)
28 #define EV6__I_STAT__ERRMASK (EV6__I_STAT__PAR)
29 
30  if (!(i_stat & EV6__I_STAT__ERRMASK))
31  return MCHK_DISPOSITION_UNKNOWN_ERROR;
32 
33  if (!print)
34  return status;
35 
36  if (i_stat & EV6__I_STAT__PAR)
37  printk("%s Icache parity error\n", err_print_prefix);
38 
39  return status;
40 }
41 
42 static int
43 ev6_parse_mbox(u64 mm_stat, u64 d_stat, u64 c_stat, int print)
44 {
45  int status = MCHK_DISPOSITION_REPORT;
46 
47 #define EV6__MM_STAT__DC_TAG_PERR (1UL << 10)
48 #define EV6__MM_STAT__ERRMASK (EV6__MM_STAT__DC_TAG_PERR)
49 #define EV6__D_STAT__TPERR_P0 (1UL << 0)
50 #define EV6__D_STAT__TPERR_P1 (1UL << 1)
51 #define EV6__D_STAT__ECC_ERR_ST (1UL << 2)
52 #define EV6__D_STAT__ECC_ERR_LD (1UL << 3)
53 #define EV6__D_STAT__SEO (1UL << 4)
54 #define EV6__D_STAT__ERRMASK (EV6__D_STAT__TPERR_P0 | \
55  EV6__D_STAT__TPERR_P1 | \
56  EV6__D_STAT__ECC_ERR_ST | \
57  EV6__D_STAT__ECC_ERR_LD | \
58  EV6__D_STAT__SEO)
59 
60  if (!(d_stat & EV6__D_STAT__ERRMASK) &&
61  !(mm_stat & EV6__MM_STAT__ERRMASK))
62  return MCHK_DISPOSITION_UNKNOWN_ERROR;
63 
64  if (!print)
65  return status;
66 
67  if (mm_stat & EV6__MM_STAT__DC_TAG_PERR)
68  printk("%s Dcache tag parity error on probe\n",
69  err_print_prefix);
70  if (d_stat & EV6__D_STAT__TPERR_P0)
71  printk("%s Dcache tag parity error - pipe 0\n",
72  err_print_prefix);
73  if (d_stat & EV6__D_STAT__TPERR_P1)
74  printk("%s Dcache tag parity error - pipe 1\n",
75  err_print_prefix);
76  if (d_stat & EV6__D_STAT__ECC_ERR_ST)
77  printk("%s ECC error occurred on a store\n",
78  err_print_prefix);
79  if (d_stat & EV6__D_STAT__ECC_ERR_LD)
80  printk("%s ECC error occurred on a %s load\n",
81  err_print_prefix,
82  c_stat ? "" : "speculative ");
83  if (d_stat & EV6__D_STAT__SEO)
84  printk("%s Dcache second error\n", err_print_prefix);
85 
86  return status;
87 }
88 
89 static int
90 ev6_parse_cbox(u64 c_addr, u64 c1_syn, u64 c2_syn,
91  u64 c_stat, u64 c_sts, int print)
92 {
93  static const char * const sourcename[] = {
94  "UNKNOWN", "UNKNOWN", "UNKNOWN",
95  "MEMORY", "BCACHE", "DCACHE",
96  "BCACHE PROBE", "BCACHE PROBE"
97  };
98  static const char * const streamname[] = { "D", "I" };
99  static const char * const bitsname[] = { "SINGLE", "DOUBLE" };
100  int status = MCHK_DISPOSITION_REPORT;
101  int source = -1, stream = -1, bits = -1;
102 
103 #define EV6__C_STAT__BC_PERR (0x01)
104 #define EV6__C_STAT__DC_PERR (0x02)
105 #define EV6__C_STAT__DSTREAM_MEM_ERR (0x03)
106 #define EV6__C_STAT__DSTREAM_BC_ERR (0x04)
107 #define EV6__C_STAT__DSTREAM_DC_ERR (0x05)
108 #define EV6__C_STAT__PROBE_BC_ERR0 (0x06) /* both 6 and 7 indicate... */
109 #define EV6__C_STAT__PROBE_BC_ERR1 (0x07) /* ...probe bc error. */
110 #define EV6__C_STAT__ISTREAM_MEM_ERR (0x0B)
111 #define EV6__C_STAT__ISTREAM_BC_ERR (0x0C)
112 #define EV6__C_STAT__DSTREAM_MEM_DBL (0x13)
113 #define EV6__C_STAT__DSTREAM_BC_DBL (0x14)
114 #define EV6__C_STAT__ISTREAM_MEM_DBL (0x1B)
115 #define EV6__C_STAT__ISTREAM_BC_DBL (0x1C)
116 #define EV6__C_STAT__SOURCE_MEMORY (0x03)
117 #define EV6__C_STAT__SOURCE_BCACHE (0x04)
118 #define EV6__C_STAT__SOURCE__S (0)
119 #define EV6__C_STAT__SOURCE__M (0x07)
120 #define EV6__C_STAT__ISTREAM__S (3)
121 #define EV6__C_STAT__ISTREAM__M (0x01)
122 #define EV6__C_STAT__DOUBLE__S (4)
123 #define EV6__C_STAT__DOUBLE__M (0x01)
124 #define EV6__C_STAT__ERRMASK (0x1F)
125 #define EV6__C_STS__SHARED (1 << 0)
126 #define EV6__C_STS__DIRTY (1 << 1)
127 #define EV6__C_STS__VALID (1 << 2)
128 #define EV6__C_STS__PARITY (1 << 3)
129 
130  if (!(c_stat & EV6__C_STAT__ERRMASK))
131  return MCHK_DISPOSITION_UNKNOWN_ERROR;
132 
133  if (!print)
134  return status;
135 
136  source = EXTRACT(c_stat, EV6__C_STAT__SOURCE);
137  stream = EXTRACT(c_stat, EV6__C_STAT__ISTREAM);
138  bits = EXTRACT(c_stat, EV6__C_STAT__DOUBLE);
139 
140  if (c_stat & EV6__C_STAT__BC_PERR) {
141  printk("%s Bcache tag parity error\n", err_print_prefix);
142  source = -1;
143  }
144 
145  if (c_stat & EV6__C_STAT__DC_PERR) {
146  printk("%s Dcache tag parity error\n", err_print_prefix);
147  source = -1;
148  }
149 
150  if (c_stat == EV6__C_STAT__PROBE_BC_ERR0 ||
151  c_stat == EV6__C_STAT__PROBE_BC_ERR1) {
152  printk("%s Bcache single-bit error on a probe hit\n",
153  err_print_prefix);
154  source = -1;
155  }
156 
157  if (source != -1)
158  printk("%s %s-STREAM %s-BIT ECC error from %s\n",
159  err_print_prefix,
160  streamname[stream], bitsname[bits], sourcename[source]);
161 
162  printk("%s Address: 0x%016llx\n"
163  " Syndrome[upper.lower]: %02llx.%02llx\n",
164  err_print_prefix,
165  c_addr,
166  c2_syn, c1_syn);
167 
168  if (source == EV6__C_STAT__SOURCE_MEMORY ||
169  source == EV6__C_STAT__SOURCE_BCACHE)
170  printk("%s Block status: %s%s%s%s\n",
171  err_print_prefix,
172  (c_sts & EV6__C_STS__SHARED) ? "SHARED " : "",
173  (c_sts & EV6__C_STS__DIRTY) ? "DIRTY " : "",
174  (c_sts & EV6__C_STS__VALID) ? "VALID " : "",
175  (c_sts & EV6__C_STS__PARITY) ? "PARITY " : "");
176 
177  return status;
178 }
179 
180 void
181 ev6_register_error_handlers(void)
182 {
183  /* None right now. */
184 }
185 
186 int
187 ev6_process_logout_frame(struct el_common *mchk_header, int print)
188 {
189  struct el_common_EV6_mcheck *ev6mchk =
190  (struct el_common_EV6_mcheck *)mchk_header;
191  int status = MCHK_DISPOSITION_UNKNOWN_ERROR;
192 
193  status |= ev6_parse_ibox(ev6mchk->I_STAT, print);
194  status |= ev6_parse_mbox(ev6mchk->MM_STAT, ev6mchk->DC_STAT,
195  ev6mchk->C_STAT, print);
196  status |= ev6_parse_cbox(ev6mchk->C_ADDR, ev6mchk->DC1_SYNDROME,
197  ev6mchk->DC0_SYNDROME, ev6mchk->C_STAT,
198  ev6mchk->C_STS, print);
199 
200  if (!print)
201  return status;
202 
203  if (status != MCHK_DISPOSITION_DISMISS) {
204  char *saved_err_prefix = err_print_prefix;
205 
206  /*
207  * Dump some additional information from the frame
208  */
209  printk("%s EXC_ADDR: 0x%016lx IER_CM: 0x%016lx"
210  " ISUM: 0x%016lx\n"
211  " PAL_BASE: 0x%016lx I_CTL: 0x%016lx"
212  " PCTX: 0x%016lx\n",
213  err_print_prefix,
214  ev6mchk->EXC_ADDR, ev6mchk->IER_CM, ev6mchk->ISUM,
215  ev6mchk->PAL_BASE, ev6mchk->I_CTL, ev6mchk->PCTX);
216 
217  if (status == MCHK_DISPOSITION_UNKNOWN_ERROR) {
218  printk("%s UNKNOWN error, frame follows:\n",
219  err_print_prefix);
220  } else {
221  /* had decode -- downgrade print level for frame */
222  err_print_prefix = KERN_NOTICE;
223  }
224 
225  mchk_dump_logout_frame(mchk_header);
226 
227  err_print_prefix = saved_err_prefix;
228  }
229 
230  return status;
231 }
232 
233 void
234 ev6_machine_check(unsigned long vector, unsigned long la_ptr)
235 {
236  struct el_common *mchk_header = (struct el_common *)la_ptr;
237 
238  /*
239  * Sync the processor
240  */
241  mb();
242  draina();
243 
244  /*
245  * Parse the logout frame without printing first. If the only error(s)
246  * found are have a disposition of "dismiss", then just dismiss them
247  * and don't print any message
248  */
249  if (ev6_process_logout_frame(mchk_header, 0) !=
250  MCHK_DISPOSITION_DISMISS) {
251  char *saved_err_prefix = err_print_prefix;
252  err_print_prefix = KERN_CRIT;
253 
254  /*
255  * Either a nondismissable error was detected or no
256  * recognized error was detected in the logout frame
257  * -- report the error in either case
258  */
259  printk("%s*CPU %s Error (Vector 0x%x) reported on CPU %d:\n",
260  err_print_prefix,
261  (vector == SCB_Q_PROCERR)?"Correctable":"Uncorrectable",
262  (unsigned int)vector, (int)smp_processor_id());
263 
264  ev6_process_logout_frame(mchk_header, 1);
265  dik_show_regs(get_irq_regs(), NULL);
266 
267  err_print_prefix = saved_err_prefix;
268  }
269 
270  /*
271  * Release the logout frame
272  */
273  wrmces(0x7);
274  mb();
275 }
276 
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