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
ev6_parse_ibox(u64 i_stat,int print)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
ev6_parse_mbox(u64 mm_stat,u64 d_stat,u64 c_stat,int print)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
ev6_parse_cbox(u64 c_addr,u64 c1_syn,u64 c2_syn,u64 c_stat,u64 c_sts,int print)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
ev6_register_error_handlers(void)181 ev6_register_error_handlers(void)
182 {
183 /* None right now. */
184 }
185
186 int
ev6_process_logout_frame(struct el_common * mchk_header,int print)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 /*
194 * ES40 correctable frames end the CPU area before EXC_ADDR (Table
195 * D-19). Validate both regions before decoding or dumping any data.
196 */
197 if (mchk_header->proc_offset != offsetof(struct el_common_EV6_mcheck,
198 I_STAT) ||
199 mchk_header->sys_offset < offsetof(struct el_common_EV6_mcheck,
200 EXC_ADDR) ||
201 mchk_header->sys_offset > mchk_header->size ||
202 ((mchk_header->sys_offset | mchk_header->size) & 7)) {
203 if (print) {
204 printk("%s Invalid EV6 logout frame: size %x, CPU %x, system %x\n",
205 err_print_prefix, mchk_header->size,
206 mchk_header->proc_offset, mchk_header->sys_offset);
207 mchk_dump_logout_frame_raw(mchk_header);
208 }
209 return MCHK_DISPOSITION_UNKNOWN_ERROR;
210 }
211
212 status |= ev6_parse_ibox(ev6mchk->I_STAT, print);
213 status |= ev6_parse_mbox(ev6mchk->MM_STAT, ev6mchk->DC_STAT,
214 ev6mchk->C_STAT, print);
215 status |= ev6_parse_cbox(ev6mchk->C_ADDR, ev6mchk->DC1_SYNDROME,
216 ev6mchk->DC0_SYNDROME, ev6mchk->C_STAT,
217 ev6mchk->C_STS, print);
218
219 if (!print)
220 return status;
221
222 if (status != MCHK_DISPOSITION_DISMISS) {
223 char *saved_err_prefix = err_print_prefix;
224
225 /* These registers are absent from short correctable frames. */
226 if (mchk_header->sys_offset >= sizeof(*ev6mchk))
227 printk("%s EXC_ADDR: 0x%016lx IER_CM: 0x%016lx"
228 " ISUM: 0x%016lx\n"
229 " PAL_BASE: 0x%016lx I_CTL: 0x%016lx"
230 " PCTX: 0x%016lx\n",
231 err_print_prefix,
232 ev6mchk->EXC_ADDR, ev6mchk->IER_CM, ev6mchk->ISUM,
233 ev6mchk->PAL_BASE, ev6mchk->I_CTL, ev6mchk->PCTX);
234
235 if (status == MCHK_DISPOSITION_UNKNOWN_ERROR) {
236 printk("%s UNKNOWN error, frame follows:\n",
237 err_print_prefix);
238 } else {
239 /* had decode -- downgrade print level for frame */
240 err_print_prefix = KERN_NOTICE;
241 }
242
243 mchk_dump_logout_frame(mchk_header);
244
245 err_print_prefix = saved_err_prefix;
246 }
247
248 return status;
249 }
250
251 void
ev6_machine_check(unsigned long vector,unsigned long la_ptr)252 ev6_machine_check(unsigned long vector, unsigned long la_ptr)
253 {
254 struct el_common *mchk_header = (struct el_common *)la_ptr;
255
256 /*
257 * Sync the processor
258 */
259 mb();
260 draina();
261
262 /*
263 * Parse the logout frame without printing first. If the only error(s)
264 * found are have a disposition of "dismiss", then just dismiss them
265 * and don't print any message
266 */
267 if (ev6_process_logout_frame(mchk_header, 0) !=
268 MCHK_DISPOSITION_DISMISS) {
269 char *saved_err_prefix = err_print_prefix;
270 err_print_prefix = KERN_CRIT;
271
272 /*
273 * Either a nondismissable error was detected or no
274 * recognized error was detected in the logout frame
275 * -- report the error in either case
276 */
277 printk("%s*CPU %s Error (Vector 0x%x) reported on CPU %d:\n",
278 err_print_prefix,
279 (vector == SCB_Q_PROCERR)?"Correctable":"Uncorrectable",
280 (unsigned int)vector, (int)smp_processor_id());
281
282 ev6_process_logout_frame(mchk_header, 1);
283 dik_show_regs(get_irq_regs(), NULL);
284
285 err_print_prefix = saved_err_prefix;
286 }
287
288 /*
289 * Release the logout frame
290 */
291 wrmces(0x7);
292 mb();
293 }
294
295