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Linux/arch/alpha/kernel/err_ev6.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *      linux/arch/alpha/kernel/err_ev6.c
  4  *
  5  *      Copyright (C) 2000 Jeff Wiedemeier (Compaq Computer Corporation)
  6  *
  7  *      Error handling code supporting Alpha systems
  8  */
  9 
 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 
277 

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