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Linux/arch/mips/dec/ecc-berr.c

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  1 /*
  2  *      Bus error event handling code for systems equipped with ECC
  3  *      handling logic, i.e. DECstation/DECsystem 5000/200 (KN02),
  4  *      5000/240 (KN03), 5000/260 (KN05) and DECsystem 5900 (KN03),
  5  *      5900/260 (KN05) systems.
  6  *
  7  *      Copyright (c) 2003, 2005  Maciej W. Rozycki
  8  *
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License
 11  *      as published by the Free Software Foundation; either version
 12  *      2 of the License, or (at your option) any later version.
 13  */
 14 
 15 #include <linux/init.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/kernel.h>
 18 #include <linux/sched.h>
 19 #include <linux/types.h>
 20 
 21 #include <asm/addrspace.h>
 22 #include <asm/bootinfo.h>
 23 #include <asm/cpu.h>
 24 #include <asm/irq_regs.h>
 25 #include <asm/processor.h>
 26 #include <asm/ptrace.h>
 27 #include <asm/traps.h>
 28 
 29 #include <asm/dec/ecc.h>
 30 #include <asm/dec/kn02.h>
 31 #include <asm/dec/kn03.h>
 32 #include <asm/dec/kn05.h>
 33 
 34 static volatile u32 *kn0x_erraddr;
 35 static volatile u32 *kn0x_chksyn;
 36 
 37 static inline void dec_ecc_be_ack(void)
 38 {
 39         *kn0x_erraddr = 0;                      /* any write clears the IRQ */
 40         iob();
 41 }
 42 
 43 static int dec_ecc_be_backend(struct pt_regs *regs, int is_fixup, int invoker)
 44 {
 45         static const char excstr[] = "exception";
 46         static const char intstr[] = "interrupt";
 47         static const char cpustr[] = "CPU";
 48         static const char dmastr[] = "DMA";
 49         static const char readstr[] = "read";
 50         static const char mreadstr[] = "memory read";
 51         static const char writestr[] = "write";
 52         static const char mwritstr[] = "partial memory write";
 53         static const char timestr[] = "timeout";
 54         static const char overstr[] = "overrun";
 55         static const char eccstr[] = "ECC error";
 56 
 57         const char *kind, *agent, *cycle, *event;
 58         const char *status = "", *xbit = "", *fmt = "";
 59         unsigned long address;
 60         u16 syn = 0, sngl;
 61 
 62         int i = 0;
 63 
 64         u32 erraddr = *kn0x_erraddr;
 65         u32 chksyn = *kn0x_chksyn;
 66         int action = MIPS_BE_FATAL;
 67 
 68         /* For non-ECC ack ASAP, so that any subsequent errors get caught. */
 69         if ((erraddr & (KN0X_EAR_VALID | KN0X_EAR_ECCERR)) == KN0X_EAR_VALID)
 70                 dec_ecc_be_ack();
 71 
 72         kind = invoker ? intstr : excstr;
 73 
 74         if (!(erraddr & KN0X_EAR_VALID)) {
 75                 /* No idea what happened. */
 76                 printk(KERN_ALERT "Unidentified bus error %s\n", kind);
 77                 return action;
 78         }
 79 
 80         agent = (erraddr & KN0X_EAR_CPU) ? cpustr : dmastr;
 81 
 82         if (erraddr & KN0X_EAR_ECCERR) {
 83                 /* An ECC error on a CPU or DMA transaction. */
 84                 cycle = (erraddr & KN0X_EAR_WRITE) ? mwritstr : mreadstr;
 85                 event = eccstr;
 86         } else {
 87                 /* A CPU timeout or a DMA overrun. */
 88                 cycle = (erraddr & KN0X_EAR_WRITE) ? writestr : readstr;
 89                 event = (erraddr & KN0X_EAR_CPU) ? timestr : overstr;
 90         }
 91 
 92         address = erraddr & KN0X_EAR_ADDRESS;
 93         /* For ECC errors on reads adjust for MT pipelining. */
 94         if ((erraddr & (KN0X_EAR_WRITE | KN0X_EAR_ECCERR)) == KN0X_EAR_ECCERR)
 95                 address = (address & ~0xfffLL) | ((address - 5) & 0xfffLL);
 96         address <<= 2;
 97 
 98         /* Only CPU errors are fixable. */
 99         if (erraddr & KN0X_EAR_CPU && is_fixup)
100                 action = MIPS_BE_FIXUP;
101 
102         if (erraddr & KN0X_EAR_ECCERR) {
103                 static const u8 data_sbit[32] = {
104                         0x4f, 0x4a, 0x52, 0x54, 0x57, 0x58, 0x5b, 0x5d,
105                         0x23, 0x25, 0x26, 0x29, 0x2a, 0x2c, 0x31, 0x34,
106                         0x0e, 0x0b, 0x13, 0x15, 0x16, 0x19, 0x1a, 0x1c,
107                         0x62, 0x64, 0x67, 0x68, 0x6b, 0x6d, 0x70, 0x75,
108                 };
109                 static const u8 data_mbit[25] = {
110                         0x07, 0x0d, 0x1f,
111                         0x2f, 0x32, 0x37, 0x38, 0x3b, 0x3d, 0x3e,
112                         0x43, 0x45, 0x46, 0x49, 0x4c, 0x51, 0x5e,
113                         0x61, 0x6e, 0x73, 0x76, 0x79, 0x7a, 0x7c, 0x7f,
114                 };
115                 static const char sbestr[] = "corrected single";
116                 static const char dbestr[] = "uncorrectable double";
117                 static const char mbestr[] = "uncorrectable multiple";
118 
119                 if (!(address & 0x4))
120                         syn = chksyn;                   /* Low bank. */
121                 else
122                         syn = chksyn >> 16;             /* High bank. */
123 
124                 if (!(syn & KN0X_ESR_VLDLO)) {
125                         /* Ack now, no rewrite will happen. */
126                         dec_ecc_be_ack();
127 
128                         fmt = KERN_ALERT "%s" "invalid\n";
129                 } else {
130                         sngl = syn & KN0X_ESR_SNGLO;
131                         syn &= KN0X_ESR_SYNLO;
132 
133                         /*
134                          * Multibit errors may be tagged incorrectly;
135                          * check the syndrome explicitly.
136                          */
137                         for (i = 0; i < 25; i++)
138                                 if (syn == data_mbit[i])
139                                         break;
140 
141                         if (i < 25) {
142                                 status = mbestr;
143                         } else if (!sngl) {
144                                 status = dbestr;
145                         } else {
146                                 volatile u32 *ptr =
147                                         (void *)CKSEG1ADDR(address);
148 
149                                 *ptr = *ptr;            /* Rewrite. */
150                                 iob();
151 
152                                 status = sbestr;
153                                 action = MIPS_BE_DISCARD;
154                         }
155 
156                         /* Ack now, now we've rewritten (or not). */
157                         dec_ecc_be_ack();
158 
159                         if (syn && syn == (syn & -syn)) {
160                                 if (syn == 0x01) {
161                                         fmt = KERN_ALERT "%s"
162                                               "%#04x -- %s bit error "
163                                               "at check bit C%s\n";
164                                         xbit = "X";
165                                 } else {
166                                         fmt = KERN_ALERT "%s"
167                                               "%#04x -- %s bit error "
168                                               "at check bit C%s%u\n";
169                                 }
170                                 i = syn >> 2;
171                         } else {
172                                 for (i = 0; i < 32; i++)
173                                         if (syn == data_sbit[i])
174                                                 break;
175                                 if (i < 32)
176                                         fmt = KERN_ALERT "%s"
177                                               "%#04x -- %s bit error "
178                                               "at data bit D%s%u\n";
179                                 else
180                                         fmt = KERN_ALERT "%s"
181                                               "%#04x -- %s bit error\n";
182                         }
183                 }
184         }
185 
186         if (action != MIPS_BE_FIXUP)
187                 printk(KERN_ALERT "Bus error %s: %s %s %s at %#010lx\n",
188                         kind, agent, cycle, event, address);
189 
190         if (action != MIPS_BE_FIXUP && erraddr & KN0X_EAR_ECCERR)
191                 printk(fmt, "  ECC syndrome ", syn, status, xbit, i);
192 
193         return action;
194 }
195 
196 int dec_ecc_be_handler(struct pt_regs *regs, int is_fixup)
197 {
198         return dec_ecc_be_backend(regs, is_fixup, 0);
199 }
200 
201 irqreturn_t dec_ecc_be_interrupt(int irq, void *dev_id)
202 {
203         struct pt_regs *regs = get_irq_regs();
204 
205         int action = dec_ecc_be_backend(regs, 0, 1);
206 
207         if (action == MIPS_BE_DISCARD)
208                 return IRQ_HANDLED;
209 
210         /*
211          * FIXME: Find the affected processes and kill them, otherwise
212          * we must die.
213          *
214          * The interrupt is asynchronously delivered thus EPC and RA
215          * may be irrelevant, but are printed for a reference.
216          */
217         printk(KERN_ALERT "Fatal bus interrupt, epc == %08lx, ra == %08lx\n",
218                regs->cp0_epc, regs->regs[31]);
219         die("Unrecoverable bus error", regs);
220 }
221 
222 
223 /*
224  * Initialization differs a bit between KN02 and KN03/KN05, so we
225  * need two variants.  Once set up, all systems can be handled the
226  * same way.
227  */
228 static inline void dec_kn02_be_init(void)
229 {
230         volatile u32 *csr = (void *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR);
231 
232         kn0x_erraddr = (void *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_ERRADDR);
233         kn0x_chksyn = (void *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_CHKSYN);
234 
235         /* Preset write-only bits of the Control Register cache. */
236         cached_kn02_csr = *csr | KN02_CSR_LEDS;
237 
238         /* Set normal ECC detection and generation. */
239         cached_kn02_csr &= ~(KN02_CSR_DIAGCHK | KN02_CSR_DIAGGEN);
240         /* Enable ECC correction. */
241         cached_kn02_csr |= KN02_CSR_CORRECT;
242         *csr = cached_kn02_csr;
243         iob();
244 }
245 
246 static inline void dec_kn03_be_init(void)
247 {
248         volatile u32 *mcr = (void *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_MCR);
249         volatile u32 *mbcs = (void *)CKSEG1ADDR(KN4K_SLOT_BASE + KN4K_MB_CSR);
250 
251         kn0x_erraddr = (void *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_ERRADDR);
252         kn0x_chksyn = (void *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_CHKSYN);
253 
254         /*
255          * Set normal ECC detection and generation, enable ECC correction.
256          * For KN05 we also need to make sure EE (?) is enabled in the MB.
257          * Otherwise DBE/IBE exceptions would be masked but bus error
258          * interrupts would still arrive, resulting in an inevitable crash
259          * if get_dbe() triggers one.
260          */
261         *mcr = (*mcr & ~(KN03_MCR_DIAGCHK | KN03_MCR_DIAGGEN)) |
262                KN03_MCR_CORRECT;
263         if (current_cpu_type() == CPU_R4400SC)
264                 *mbcs |= KN4K_MB_CSR_EE;
265         fast_iob();
266 }
267 
268 void __init dec_ecc_be_init(void)
269 {
270         if (mips_machtype == MACH_DS5000_200)
271                 dec_kn02_be_init();
272         else
273                 dec_kn03_be_init();
274 
275         /* Clear any leftover errors from the firmware. */
276         dec_ecc_be_ack();
277 }
278 

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