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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
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 	char *sourcename[] = { "UNKNOWN", "UNKNOWN", "UNKNOWN",
94 			       "MEMORY", "BCACHE", "DCACHE",
95 			       "BCACHE PROBE", "BCACHE PROBE" };
96 	char *streamname[] = { "D", "I" };
97 	char *bitsname[] = { "SINGLE", "DOUBLE" };
98 	int status = MCHK_DISPOSITION_REPORT;
99 	int source = -1, stream = -1, bits = -1;
100 
101 #define EV6__C_STAT__BC_PERR		(0x01)
102 #define EV6__C_STAT__DC_PERR		(0x02)
103 #define EV6__C_STAT__DSTREAM_MEM_ERR	(0x03)
104 #define EV6__C_STAT__DSTREAM_BC_ERR	(0x04)
105 #define EV6__C_STAT__DSTREAM_DC_ERR	(0x05)
106 #define EV6__C_STAT__PROBE_BC_ERR0	(0x06)	/* both 6 and 7 indicate... */
107 #define EV6__C_STAT__PROBE_BC_ERR1	(0x07)	/* ...probe bc error.       */
108 #define EV6__C_STAT__ISTREAM_MEM_ERR	(0x0B)
109 #define EV6__C_STAT__ISTREAM_BC_ERR	(0x0C)
110 #define EV6__C_STAT__DSTREAM_MEM_DBL	(0x13)
111 #define EV6__C_STAT__DSTREAM_BC_DBL	(0x14)
112 #define EV6__C_STAT__ISTREAM_MEM_DBL	(0x1B)
113 #define EV6__C_STAT__ISTREAM_BC_DBL	(0x1C)
114 #define EV6__C_STAT__SOURCE_MEMORY	(0x03)
115 #define EV6__C_STAT__SOURCE_BCACHE	(0x04)
116 #define EV6__C_STAT__SOURCE__S		(0)
117 #define EV6__C_STAT__SOURCE__M 		(0x07)
118 #define EV6__C_STAT__ISTREAM__S		(3)
119 #define EV6__C_STAT__ISTREAM__M		(0x01)
120 #define EV6__C_STAT__DOUBLE__S		(4)
121 #define EV6__C_STAT__DOUBLE__M		(0x01)
122 #define EV6__C_STAT__ERRMASK		(0x1F)
123 #define EV6__C_STS__SHARED		(1 << 0)
124 #define EV6__C_STS__DIRTY		(1 << 1)
125 #define EV6__C_STS__VALID		(1 << 2)
126 #define EV6__C_STS__PARITY		(1 << 3)
127 
128 	if (!(c_stat & EV6__C_STAT__ERRMASK))
129 		return MCHK_DISPOSITION_UNKNOWN_ERROR;
130 
131 	if (!print)
132 		return status;
133 
134 	source = EXTRACT(c_stat, EV6__C_STAT__SOURCE);
135 	stream = EXTRACT(c_stat, EV6__C_STAT__ISTREAM);
136 	bits = EXTRACT(c_stat, EV6__C_STAT__DOUBLE);
137 
138 	if (c_stat & EV6__C_STAT__BC_PERR) {
139 		printk("%s    Bcache tag parity error\n", err_print_prefix);
140 		source = -1;
141 	}
142 
143 	if (c_stat & EV6__C_STAT__DC_PERR) {
144 		printk("%s    Dcache tag parity error\n", err_print_prefix);
145 		source = -1;
146 	}
147 
148 	if (c_stat == EV6__C_STAT__PROBE_BC_ERR0 ||
149 	    c_stat == EV6__C_STAT__PROBE_BC_ERR1) {
150 		printk("%s    Bcache single-bit error on a probe hit\n",
151 		       err_print_prefix);
152 		source = -1;
153 	}
154 
155 	if (source != -1)
156 		printk("%s    %s-STREAM %s-BIT ECC error from %s\n",
157 		       err_print_prefix,
158 		       streamname[stream], bitsname[bits], sourcename[source]);
159 
160 	printk("%s    Address: 0x%016lx\n"
161 	         "    Syndrome[upper.lower]: %02lx.%02lx\n",
162 	       err_print_prefix,
163 	       c_addr,
164 	       c2_syn, c1_syn);
165 
166 	if (source == EV6__C_STAT__SOURCE_MEMORY ||
167 	    source == EV6__C_STAT__SOURCE_BCACHE)
168 		printk("%s    Block status: %s%s%s%s\n",
169 		       err_print_prefix,
170 		       (c_sts & EV6__C_STS__SHARED) ? "SHARED " : "",
171 		       (c_sts & EV6__C_STS__DIRTY)  ? "DIRTY "  : "",
172 		       (c_sts & EV6__C_STS__VALID)  ? "VALID "  : "",
173 		       (c_sts & EV6__C_STS__PARITY) ? "PARITY " : "");
174 
175 	return status;
176 }
177 
178 void
ev6_register_error_handlers(void)179 ev6_register_error_handlers(void)
180 {
181 	/* None right now. */
182 }
183 
184 int
ev6_process_logout_frame(struct el_common * mchk_header,int print)185 ev6_process_logout_frame(struct el_common *mchk_header, int print)
186 {
187 	struct el_common_EV6_mcheck *ev6mchk =
188 		(struct el_common_EV6_mcheck *)mchk_header;
189 	int status = MCHK_DISPOSITION_UNKNOWN_ERROR;
190 
191 	status |= ev6_parse_ibox(ev6mchk->I_STAT, print);
192 	status |= ev6_parse_mbox(ev6mchk->MM_STAT, ev6mchk->DC_STAT,
193 				 ev6mchk->C_STAT, print);
194 	status |= ev6_parse_cbox(ev6mchk->C_ADDR, ev6mchk->DC1_SYNDROME,
195 				 ev6mchk->DC0_SYNDROME, ev6mchk->C_STAT,
196 				 ev6mchk->C_STS, print);
197 
198 	if (!print)
199 		return status;
200 
201 	if (status != MCHK_DISPOSITION_DISMISS) {
202 		char *saved_err_prefix = err_print_prefix;
203 
204 		/*
205 		 * Dump some additional information from the frame
206 		 */
207 		printk("%s    EXC_ADDR: 0x%016lx   IER_CM: 0x%016lx"
208 		            "   ISUM: 0x%016lx\n"
209 		         "    PAL_BASE: 0x%016lx   I_CTL:  0x%016lx"
210 		            "   PCTX: 0x%016lx\n",
211 		       err_print_prefix,
212 		       ev6mchk->EXC_ADDR, ev6mchk->IER_CM, ev6mchk->ISUM,
213 		       ev6mchk->PAL_BASE, ev6mchk->I_CTL, ev6mchk->PCTX);
214 
215 		if (status == MCHK_DISPOSITION_UNKNOWN_ERROR) {
216 			printk("%s    UNKNOWN error, frame follows:\n",
217 			       err_print_prefix);
218 		} else {
219 			/* had decode -- downgrade print level for frame */
220 			err_print_prefix = KERN_NOTICE;
221 		}
222 
223 		mchk_dump_logout_frame(mchk_header);
224 
225 		err_print_prefix = saved_err_prefix;
226 	}
227 
228 	return status;
229 }
230 
231 void
ev6_machine_check(u64 vector,u64 la_ptr)232 ev6_machine_check(u64 vector, u64 la_ptr)
233 {
234 	struct el_common *mchk_header = (struct el_common *)la_ptr;
235 
236 	/*
237 	 * Sync the processor
238 	 */
239 	mb();
240 	draina();
241 
242 	/*
243 	 * Parse the logout frame without printing first. If the only error(s)
244 	 * found are have a disposition of "dismiss", then just dismiss them
245 	 * and don't print any message
246 	 */
247 	if (ev6_process_logout_frame(mchk_header, 0) !=
248 	    MCHK_DISPOSITION_DISMISS) {
249 		char *saved_err_prefix = err_print_prefix;
250 		err_print_prefix = KERN_CRIT;
251 
252 		/*
253 		 * Either a nondismissable error was detected or no
254 		 * recognized error was detected  in the logout frame
255 		 * -- report the error in either case
256 		 */
257 		printk("%s*CPU %s Error (Vector 0x%x) reported on CPU %d:\n",
258 		       err_print_prefix,
259 		       (vector == SCB_Q_PROCERR)?"Correctable":"Uncorrectable",
260 		       (unsigned int)vector, (int)smp_processor_id());
261 
262 		ev6_process_logout_frame(mchk_header, 1);
263 		dik_show_regs(get_irq_regs(), NULL);
264 
265 		err_print_prefix = saved_err_prefix;
266 	}
267 
268 	/*
269 	 * Release the logout frame
270 	 */
271 	wrmces(0x7);
272 	mb();
273 }
274 
275