aboutsummaryrefslogtreecommitdiffstats
path: root/arch/alpha/kernel/err_ev6.c
blob: 64f59f2fcf5cc8aa8f5659158e77f9efb6281c64 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
/*
 *	linux/arch/alpha/kernel/err_ev6.c
 *
 *	Copyright (C) 2000 Jeff Wiedemeier (Compaq Computer Corporation)
 *
 *	Error handling code supporting Alpha systems
 */

#include <linux/init.h>
#include <linux/pci.h>
#include <linux/sched.h>

#include <asm/io.h>
#include <asm/hwrpb.h>
#include <asm/smp.h>
#include <asm/err_common.h>
#include <asm/err_ev6.h>

#include "err_impl.h"
#include "proto.h"

static int
ev6_parse_ibox(u64 i_stat, int print)
{
	int status = MCHK_DISPOSITION_REPORT;

#define EV6__I_STAT__PAR	(1UL << 29)
#define EV6__I_STAT__ERRMASK	(EV6__I_STAT__PAR)

	if (!(i_stat & EV6__I_STAT__ERRMASK))
		return MCHK_DISPOSITION_UNKNOWN_ERROR;

	if (!print)
		return status;

	if (i_stat & EV6__I_STAT__PAR)
		printk("%s    Icache parity error\n", err_print_prefix);

	return status;
}

static int
ev6_parse_mbox(u64 mm_stat, u64 d_stat, u64 c_stat, int print)
{
	int status = MCHK_DISPOSITION_REPORT;

#define EV6__MM_STAT__DC_TAG_PERR	(1UL << 10)
#define EV6__MM_STAT__ERRMASK		(EV6__MM_STAT__DC_TAG_PERR)
#define EV6__D_STAT__TPERR_P0		(1UL << 0)
#define EV6__D_STAT__TPERR_P1		(1UL << 1)
#define EV6__D_STAT__ECC_ERR_ST		(1UL << 2)
#define EV6__D_STAT__ECC_ERR_LD		(1UL << 3)
#define EV6__D_STAT__SEO		(1UL << 4)
#define EV6__D_STAT__ERRMASK		(EV6__D_STAT__TPERR_P0 |	\
                                         EV6__D_STAT__TPERR_P1 | 	\
                                         EV6__D_STAT__ECC_ERR_ST | 	\
                                         EV6__D_STAT__ECC_ERR_LD | 	\
                                         EV6__D_STAT__SEO)

	if (!(d_stat & EV6__D_STAT__ERRMASK) && 
	    !(mm_stat & EV6__MM_STAT__ERRMASK))
		return MCHK_DISPOSITION_UNKNOWN_ERROR;

	if (!print)
		return status;

	if (mm_stat & EV6__MM_STAT__DC_TAG_PERR)
		printk("%s    Dcache tag parity error on probe\n",
		       err_print_prefix);
	if (d_stat & EV6__D_STAT__TPERR_P0)
		printk("%s    Dcache tag parity error - pipe 0\n",
		       err_print_prefix);
	if (d_stat & EV6__D_STAT__TPERR_P1)
		printk("%s    Dcache tag parity error - pipe 1\n",
		       err_print_prefix);
	if (d_stat & EV6__D_STAT__ECC_ERR_ST)
		printk("%s    ECC error occurred on a store\n", 
		       err_print_prefix);
	if (d_stat & EV6__D_STAT__ECC_ERR_LD)
		printk("%s    ECC error occurred on a %s load\n",
		       err_print_prefix,
		       c_stat ? "" : "speculative ");
	if (d_stat & EV6__D_STAT__SEO)
		printk("%s    Dcache second error\n", err_print_prefix);

	return status;
}

static int
ev6_parse_cbox(u64 c_addr, u64 c1_syn, u64 c2_syn, 
	       u64 c_stat, u64 c_sts, int print)
{
	char *sourcename[] = { "UNKNOWN", "UNKNOWN", "UNKNOWN",
			       "MEMORY", "BCACHE", "DCACHE", 
			       "BCACHE PROBE", "BCACHE PROBE" };
	char *streamname[] = { "D", "I" };
	char *bitsname[] = { "SINGLE", "DOUBLE" };
	int status = MCHK_DISPOSITION_REPORT;
	int source = -1, stream = -1, bits = -1;

#define EV6__C_STAT__BC_PERR		(0x01)
#define EV6__C_STAT__DC_PERR		(0x02)
#define EV6__C_STAT__DSTREAM_MEM_ERR	(0x03)
#define EV6__C_STAT__DSTREAM_BC_ERR	(0x04)
#define EV6__C_STAT__DSTREAM_DC_ERR	(0x05)
#define EV6__C_STAT__PROBE_BC_ERR0	(0x06)	/* both 6 and 7 indicate... */
#define EV6__C_STAT__PROBE_BC_ERR1	(0x07)	/* ...probe bc error.       */
#define EV6__C_STAT__ISTREAM_MEM_ERR	(0x0B)
#define EV6__C_STAT__ISTREAM_BC_ERR	(0x0C)
#define EV6__C_STAT__DSTREAM_MEM_DBL	(0x13)
#define EV6__C_STAT__DSTREAM_BC_DBL	(0x14)
#define EV6__C_STAT__ISTREAM_MEM_DBL	(0x1B)
#define EV6__C_STAT__ISTREAM_BC_DBL	(0x1C)
#define EV6__C_STAT__SOURCE_MEMORY	(0x03)
#define EV6__C_STAT__SOURCE_BCACHE	(0x04)
#define EV6__C_STAT__SOURCE__S		(0)
#define EV6__C_STAT__SOURCE__M 		(0x07)
#define EV6__C_STAT__ISTREAM__S		(3)
#define EV6__C_STAT__ISTREAM__M		(0x01)
#define EV6__C_STAT__DOUBLE__S		(4)
#define EV6__C_STAT__DOUBLE__M		(0x01)
#define EV6__C_STAT__ERRMASK		(0x1F)
#define EV6__C_STS__SHARED		(1 << 0)
#define EV6__C_STS__DIRTY		(1 << 1)
#define EV6__C_STS__VALID		(1 << 2)
#define EV6__C_STS__PARITY		(1 << 3)

	if (!(c_stat & EV6__C_STAT__ERRMASK))
		return MCHK_DISPOSITION_UNKNOWN_ERROR;

	if (!print)
		return status;

	source = EXTRACT(c_stat, EV6__C_STAT__SOURCE);
	stream = EXTRACT(c_stat, EV6__C_STAT__ISTREAM);
	bits = EXTRACT(c_stat, EV6__C_STAT__DOUBLE);

	if (c_stat & EV6__C_STAT__BC_PERR) {
		printk("%s    Bcache tag parity error\n", err_print_prefix);
		source = -1;
	}

	if (c_stat & EV6__C_STAT__DC_PERR) {
		printk("%s    Dcache tag parity error\n", err_print_prefix);
		source = -1;
	}

	if (c_stat == EV6__C_STAT__PROBE_BC_ERR0 ||
	    c_stat == EV6__C_STAT__PROBE_BC_ERR1) {
		printk("%s    Bcache single-bit error on a probe hit\n",
		       err_print_prefix);
		source = -1;
	}

	if (source != -1) 
		printk("%s    %s-STREAM %s-BIT ECC error from %s\n",
		       err_print_prefix,
		       streamname[stream], bitsname[bits], sourcename[source]);

	printk("%s    Address: 0x%016lx\n"
	         "    Syndrome[upper.lower]: %02lx.%02lx\n", 
	       err_print_prefix,
	       c_addr,
	       c2_syn, c1_syn);

	if (source == EV6__C_STAT__SOURCE_MEMORY ||
	    source == EV6__C_STAT__SOURCE_BCACHE) 
		printk("%s    Block status: %s%s%s%s\n",
		       err_print_prefix,
		       (c_sts & EV6__C_STS__SHARED) ? "SHARED " : "",
		       (c_sts & EV6__C_STS__DIRTY)  ? "DIRTY "  : "",
		       (c_sts & EV6__C_STS__VALID)  ? "VALID "  : "",
		       (c_sts & EV6__C_STS__PARITY) ? "PARITY " : "");
		
	return status;
}

void
ev6_register_error_handlers(void)
{
	/* None right now. */
}

int
ev6_process_logout_frame(struct el_common *mchk_header, int print)
{
	struct el_common_EV6_mcheck *ev6mchk = 
		(struct el_common_EV6_mcheck *)mchk_header;
	int status = MCHK_DISPOSITION_UNKNOWN_ERROR;

	status |= ev6_parse_ibox(ev6mchk->I_STAT, print);
	status |= ev6_parse_mbox(ev6mchk->MM_STAT, ev6mchk->DC_STAT, 
				 ev6mchk->C_STAT, print);
	status |= ev6_parse_cbox(ev6mchk->C_ADDR, ev6mchk->DC1_SYNDROME,
				 ev6mchk->DC0_SYNDROME, ev6mchk->C_STAT,
				 ev6mchk->C_STS, print);

	if (!print)
		return status;

	if (status != MCHK_DISPOSITION_DISMISS) {
		char *saved_err_prefix = err_print_prefix;

		/*
		 * Dump some additional information from the frame
		 */
		printk("%s    EXC_ADDR: 0x%016lx   IER_CM: 0x%016lx"
		            "   ISUM: 0x%016lx\n"
		         "    PAL_BASE: 0x%016lx   I_CTL:  0x%016lx"
		            "   PCTX: 0x%016lx\n",
		       err_print_prefix,
		       ev6mchk->EXC_ADDR, ev6mchk->IER_CM, ev6mchk->ISUM,
		       ev6mchk->PAL_BASE, ev6mchk->I_CTL, ev6mchk->PCTX);

		if (status == MCHK_DISPOSITION_UNKNOWN_ERROR) {
			printk("%s    UNKNOWN error, frame follows:\n",
			       err_print_prefix);
		} else {
			/* had decode -- downgrade print level for frame */
			err_print_prefix = KERN_NOTICE;
		}

		mchk_dump_logout_frame(mchk_header);

		err_print_prefix = saved_err_prefix;
	}

	return status;
}

void
ev6_machine_check(u64 vector, u64 la_ptr, struct pt_regs *regs)
{
	struct el_common *mchk_header = (struct el_common *)la_ptr;

	/*
	 * Sync the processor
	 */
	mb();
	draina();

	/*
	 * Parse the logout frame without printing first. If the only error(s)
	 * found are have a disposition of "dismiss", then just dismiss them
	 * and don't print any message
	 */
	if (ev6_process_logout_frame(mchk_header, 0) != 
	    MCHK_DISPOSITION_DISMISS) {
		char *saved_err_prefix = err_print_prefix;
		err_print_prefix = KERN_CRIT;

		/*
		 * Either a nondismissable error was detected or no
		 * recognized error was detected  in the logout frame 
		 * -- report the error in either case
		 */
		printk("%s*CPU %s Error (Vector 0x%x) reported on CPU %d:\n", 
		       err_print_prefix,
		       (vector == SCB_Q_PROCERR)?"Correctable":"Uncorrectable",
		       (unsigned int)vector, (int)smp_processor_id());
		
		ev6_process_logout_frame(mchk_header, 1);
		dik_show_regs(regs, NULL);

		err_print_prefix = saved_err_prefix;
	}

	/* 
	 * Release the logout frame 
	 */
	wrmces(0x7);
	mb();
}