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-rw-r--r--arch/s390/include/asm/crw.h68
-rw-r--r--arch/s390/include/asm/nmi.h66
-rw-r--r--arch/s390/kernel/Makefile2
-rw-r--r--arch/s390/kernel/nmi.c383
-rw-r--r--arch/s390/kernel/process.c2
-rw-r--r--arch/s390/kvm/kvm-s390.c4
6 files changed, 520 insertions, 5 deletions
diff --git a/arch/s390/include/asm/crw.h b/arch/s390/include/asm/crw.h
new file mode 100644
index 000000000000..2185a6d619d3
--- /dev/null
+++ b/arch/s390/include/asm/crw.h
@@ -0,0 +1,68 @@
1/*
2 * Data definitions for channel report processing
3 * Copyright IBM Corp. 2000,2009
4 * Author(s): Ingo Adlung <adlung@de.ibm.com>,
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
6 * Cornelia Huck <cornelia.huck@de.ibm.com>,
7 * Heiko Carstens <heiko.carstens@de.ibm.com>,
8 */
9
10#ifndef _ASM_S390_CRW_H
11#define _ASM_S390_CRW_H
12
13#include <linux/types.h>
14
15/*
16 * Channel Report Word
17 */
18struct crw {
19 __u32 res1 : 1; /* reserved zero */
20 __u32 slct : 1; /* solicited */
21 __u32 oflw : 1; /* overflow */
22 __u32 chn : 1; /* chained */
23 __u32 rsc : 4; /* reporting source code */
24 __u32 anc : 1; /* ancillary report */
25 __u32 res2 : 1; /* reserved zero */
26 __u32 erc : 6; /* error-recovery code */
27 __u32 rsid : 16; /* reporting-source ID */
28} __attribute__ ((packed));
29
30typedef void (*crw_handler_t)(struct crw *, struct crw *, int);
31
32extern int crw_register_handler(int rsc, crw_handler_t handler);
33extern void crw_unregister_handler(int rsc);
34extern void crw_handle_channel_report(void);
35
36#define NR_RSCS 16
37
38#define CRW_RSC_MONITOR 0x2 /* monitoring facility */
39#define CRW_RSC_SCH 0x3 /* subchannel */
40#define CRW_RSC_CPATH 0x4 /* channel path */
41#define CRW_RSC_CONFIG 0x9 /* configuration-alert facility */
42#define CRW_RSC_CSS 0xB /* channel subsystem */
43
44#define CRW_ERC_EVENT 0x00 /* event information pending */
45#define CRW_ERC_AVAIL 0x01 /* available */
46#define CRW_ERC_INIT 0x02 /* initialized */
47#define CRW_ERC_TERROR 0x03 /* temporary error */
48#define CRW_ERC_IPARM 0x04 /* installed parm initialized */
49#define CRW_ERC_TERM 0x05 /* terminal */
50#define CRW_ERC_PERRN 0x06 /* perm. error, fac. not init */
51#define CRW_ERC_PERRI 0x07 /* perm. error, facility init */
52#define CRW_ERC_PMOD 0x08 /* installed parameters modified */
53
54static inline int stcrw(struct crw *pcrw)
55{
56 int ccode;
57
58 asm volatile(
59 " stcrw 0(%2)\n"
60 " ipm %0\n"
61 " srl %0,28\n"
62 : "=d" (ccode), "=m" (*pcrw)
63 : "a" (pcrw)
64 : "cc" );
65 return ccode;
66}
67
68#endif /* _ASM_S390_CRW_H */
diff --git a/arch/s390/include/asm/nmi.h b/arch/s390/include/asm/nmi.h
new file mode 100644
index 000000000000..f4b60441adca
--- /dev/null
+++ b/arch/s390/include/asm/nmi.h
@@ -0,0 +1,66 @@
1/*
2 * Machine check handler definitions
3 *
4 * Copyright IBM Corp. 2000,2009
5 * Author(s): Ingo Adlung <adlung@de.ibm.com>,
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
7 * Cornelia Huck <cornelia.huck@de.ibm.com>,
8 * Heiko Carstens <heiko.carstens@de.ibm.com>,
9 */
10
11#ifndef _ASM_S390_NMI_H
12#define _ASM_S390_NMI_H
13
14#include <linux/types.h>
15
16struct mci {
17 __u32 sd : 1; /* 00 system damage */
18 __u32 pd : 1; /* 01 instruction-processing damage */
19 __u32 sr : 1; /* 02 system recovery */
20 __u32 : 1; /* 03 */
21 __u32 cd : 1; /* 04 timing-facility damage */
22 __u32 ed : 1; /* 05 external damage */
23 __u32 : 1; /* 06 */
24 __u32 dg : 1; /* 07 degradation */
25 __u32 w : 1; /* 08 warning pending */
26 __u32 cp : 1; /* 09 channel-report pending */
27 __u32 sp : 1; /* 10 service-processor damage */
28 __u32 ck : 1; /* 11 channel-subsystem damage */
29 __u32 : 2; /* 12-13 */
30 __u32 b : 1; /* 14 backed up */
31 __u32 : 1; /* 15 */
32 __u32 se : 1; /* 16 storage error uncorrected */
33 __u32 sc : 1; /* 17 storage error corrected */
34 __u32 ke : 1; /* 18 storage-key error uncorrected */
35 __u32 ds : 1; /* 19 storage degradation */
36 __u32 wp : 1; /* 20 psw mwp validity */
37 __u32 ms : 1; /* 21 psw mask and key validity */
38 __u32 pm : 1; /* 22 psw program mask and cc validity */
39 __u32 ia : 1; /* 23 psw instruction address validity */
40 __u32 fa : 1; /* 24 failing storage address validity */
41 __u32 : 1; /* 25 */
42 __u32 ec : 1; /* 26 external damage code validity */
43 __u32 fp : 1; /* 27 floating point register validity */
44 __u32 gr : 1; /* 28 general register validity */
45 __u32 cr : 1; /* 29 control register validity */
46 __u32 : 1; /* 30 */
47 __u32 st : 1; /* 31 storage logical validity */
48 __u32 ie : 1; /* 32 indirect storage error */
49 __u32 ar : 1; /* 33 access register validity */
50 __u32 da : 1; /* 34 delayed access exception */
51 __u32 : 7; /* 35-41 */
52 __u32 pr : 1; /* 42 tod programmable register validity */
53 __u32 fc : 1; /* 43 fp control register validity */
54 __u32 ap : 1; /* 44 ancillary report */
55 __u32 : 1; /* 45 */
56 __u32 ct : 1; /* 46 cpu timer validity */
57 __u32 cc : 1; /* 47 clock comparator validity */
58 __u32 : 16; /* 47-63 */
59};
60
61struct pt_regs;
62
63extern void s390_handle_mcck(void);
64extern void s390_do_machine_check(struct pt_regs *regs);
65
66#endif /* _ASM_S390_NMI_H */
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 33e7aee70513..228e3105ded7 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -22,7 +22,7 @@ CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w
22obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o \ 22obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o \
23 processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \ 23 processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \
24 s390_ext.o debug.o irq.o ipl.o dis.o diag.o mem_detect.o \ 24 s390_ext.o debug.o irq.o ipl.o dis.o diag.o mem_detect.o \
25 vdso.o vtime.o sysinfo.o 25 vdso.o vtime.o sysinfo.o nmi.o
26 26
27obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o) 27obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
28obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o) 28obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
new file mode 100644
index 000000000000..8d50eaf76a60
--- /dev/null
+++ b/arch/s390/kernel/nmi.c
@@ -0,0 +1,383 @@
1/*
2 * Machine check handler
3 *
4 * Copyright IBM Corp. 2000,2009
5 * Author(s): Ingo Adlung <adlung@de.ibm.com>,
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
7 * Cornelia Huck <cornelia.huck@de.ibm.com>,
8 * Heiko Carstens <heiko.carstens@de.ibm.com>,
9 */
10
11#include <linux/init.h>
12#include <linux/errno.h>
13#include <linux/time.h>
14#include <linux/module.h>
15#include <asm/lowcore.h>
16#include <asm/smp.h>
17#include <asm/etr.h>
18#include <asm/cpu.h>
19#include <asm/nmi.h>
20#include <asm/crw.h>
21
22struct mcck_struct {
23 int kill_task;
24 int channel_report;
25 int warning;
26 unsigned long long mcck_code;
27};
28
29static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck);
30
31static NORET_TYPE void s390_handle_damage(char *msg)
32{
33 smp_send_stop();
34 disabled_wait((unsigned long) __builtin_return_address(0));
35 while (1);
36}
37
38/*
39 * Main machine check handler function. Will be called with interrupts enabled
40 * or disabled and machine checks enabled or disabled.
41 */
42void s390_handle_mcck(void)
43{
44 unsigned long flags;
45 struct mcck_struct mcck;
46
47 /*
48 * Disable machine checks and get the current state of accumulated
49 * machine checks. Afterwards delete the old state and enable machine
50 * checks again.
51 */
52 local_irq_save(flags);
53 local_mcck_disable();
54 mcck = __get_cpu_var(cpu_mcck);
55 memset(&__get_cpu_var(cpu_mcck), 0, sizeof(struct mcck_struct));
56 clear_thread_flag(TIF_MCCK_PENDING);
57 local_mcck_enable();
58 local_irq_restore(flags);
59
60 if (mcck.channel_report)
61 crw_handle_channel_report();
62
63#ifdef CONFIG_MACHCHK_WARNING
64/*
65 * The warning may remain for a prolonged period on the bare iron.
66 * (actually till the machine is powered off, or until the problem is gone)
67 * So we just stop listening for the WARNING MCH and prevent continuously
68 * being interrupted. One caveat is however, that we must do this per
69 * processor and cannot use the smp version of ctl_clear_bit().
70 * On VM we only get one interrupt per virtally presented machinecheck.
71 * Though one suffices, we may get one interrupt per (virtual) processor.
72 */
73 if (mcck.warning) { /* WARNING pending ? */
74 static int mchchk_wng_posted = 0;
75 /*
76 * Use single machine clear, as we cannot handle smp right now
77 */
78 __ctl_clear_bit(14, 24); /* Disable WARNING MCH */
79 if (xchg(&mchchk_wng_posted, 1) == 0)
80 kill_cad_pid(SIGPWR, 1);
81 }
82#endif
83
84 if (mcck.kill_task) {
85 local_irq_enable();
86 printk(KERN_EMERG "mcck: Terminating task because of machine "
87 "malfunction (code 0x%016llx).\n", mcck.mcck_code);
88 printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
89 current->comm, current->pid);
90 do_exit(SIGSEGV);
91 }
92}
93EXPORT_SYMBOL_GPL(s390_handle_mcck);
94
95/*
96 * returns 0 if all registers could be validated
97 * returns 1 otherwise
98 */
99static int notrace s390_revalidate_registers(struct mci *mci)
100{
101 int kill_task;
102 u64 tmpclock;
103 u64 zero;
104 void *fpt_save_area, *fpt_creg_save_area;
105
106 kill_task = 0;
107 zero = 0;
108
109 if (!mci->gr) {
110 /*
111 * General purpose registers couldn't be restored and have
112 * unknown contents. Process needs to be terminated.
113 */
114 kill_task = 1;
115 }
116 if (!mci->fp) {
117 /*
118 * Floating point registers can't be restored and
119 * therefore the process needs to be terminated.
120 */
121 kill_task = 1;
122 }
123#ifndef CONFIG_64BIT
124 asm volatile(
125 " ld 0,0(%0)\n"
126 " ld 2,8(%0)\n"
127 " ld 4,16(%0)\n"
128 " ld 6,24(%0)"
129 : : "a" (&S390_lowcore.floating_pt_save_area));
130#endif
131
132 if (MACHINE_HAS_IEEE) {
133#ifdef CONFIG_64BIT
134 fpt_save_area = &S390_lowcore.floating_pt_save_area;
135 fpt_creg_save_area = &S390_lowcore.fpt_creg_save_area;
136#else
137 fpt_save_area = (void *) S390_lowcore.extended_save_area_addr;
138 fpt_creg_save_area = fpt_save_area + 128;
139#endif
140 if (!mci->fc) {
141 /*
142 * Floating point control register can't be restored.
143 * Task will be terminated.
144 */
145 asm volatile("lfpc 0(%0)" : : "a" (&zero), "m" (zero));
146 kill_task = 1;
147
148 } else
149 asm volatile("lfpc 0(%0)" : : "a" (fpt_creg_save_area));
150
151 asm volatile(
152 " ld 0,0(%0)\n"
153 " ld 1,8(%0)\n"
154 " ld 2,16(%0)\n"
155 " ld 3,24(%0)\n"
156 " ld 4,32(%0)\n"
157 " ld 5,40(%0)\n"
158 " ld 6,48(%0)\n"
159 " ld 7,56(%0)\n"
160 " ld 8,64(%0)\n"
161 " ld 9,72(%0)\n"
162 " ld 10,80(%0)\n"
163 " ld 11,88(%0)\n"
164 " ld 12,96(%0)\n"
165 " ld 13,104(%0)\n"
166 " ld 14,112(%0)\n"
167 " ld 15,120(%0)\n"
168 : : "a" (fpt_save_area));
169 }
170 /* Revalidate access registers */
171 asm volatile(
172 " lam 0,15,0(%0)"
173 : : "a" (&S390_lowcore.access_regs_save_area));
174 if (!mci->ar) {
175 /*
176 * Access registers have unknown contents.
177 * Terminating task.
178 */
179 kill_task = 1;
180 }
181 /* Revalidate control registers */
182 if (!mci->cr) {
183 /*
184 * Control registers have unknown contents.
185 * Can't recover and therefore stopping machine.
186 */
187 s390_handle_damage("invalid control registers.");
188 } else {
189#ifdef CONFIG_64BIT
190 asm volatile(
191 " lctlg 0,15,0(%0)"
192 : : "a" (&S390_lowcore.cregs_save_area));
193#else
194 asm volatile(
195 " lctl 0,15,0(%0)"
196 : : "a" (&S390_lowcore.cregs_save_area));
197#endif
198 }
199 /*
200 * We don't even try to revalidate the TOD register, since we simply
201 * can't write something sensible into that register.
202 */
203#ifdef CONFIG_64BIT
204 /*
205 * See if we can revalidate the TOD programmable register with its
206 * old contents (should be zero) otherwise set it to zero.
207 */
208 if (!mci->pr)
209 asm volatile(
210 " sr 0,0\n"
211 " sckpf"
212 : : : "0", "cc");
213 else
214 asm volatile(
215 " l 0,0(%0)\n"
216 " sckpf"
217 : : "a" (&S390_lowcore.tod_progreg_save_area)
218 : "0", "cc");
219#endif
220 /* Revalidate clock comparator register */
221 asm volatile(
222 " stck 0(%1)\n"
223 " sckc 0(%1)"
224 : "=m" (tmpclock) : "a" (&(tmpclock)) : "cc", "memory");
225
226 /* Check if old PSW is valid */
227 if (!mci->wp)
228 /*
229 * Can't tell if we come from user or kernel mode
230 * -> stopping machine.
231 */
232 s390_handle_damage("old psw invalid.");
233
234 if (!mci->ms || !mci->pm || !mci->ia)
235 kill_task = 1;
236
237 return kill_task;
238}
239
240#define MAX_IPD_COUNT 29
241#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */
242
243#define ED_STP_ISLAND 6 /* External damage STP island check */
244#define ED_STP_SYNC 7 /* External damage STP sync check */
245#define ED_ETR_SYNC 12 /* External damage ETR sync check */
246#define ED_ETR_SWITCH 13 /* External damage ETR switch to local */
247
248/*
249 * machine check handler.
250 */
251void notrace s390_do_machine_check(struct pt_regs *regs)
252{
253 static int ipd_count;
254 static DEFINE_SPINLOCK(ipd_lock);
255 static unsigned long long last_ipd;
256 struct mcck_struct *mcck;
257 unsigned long long tmp;
258 struct mci *mci;
259 int umode;
260
261 lockdep_off();
262 s390_idle_check();
263
264 mci = (struct mci *) &S390_lowcore.mcck_interruption_code;
265 mcck = &__get_cpu_var(cpu_mcck);
266 umode = user_mode(regs);
267
268 if (mci->sd) {
269 /* System damage -> stopping machine */
270 s390_handle_damage("received system damage machine check.");
271 }
272 if (mci->pd) {
273 if (mci->b) {
274 /* Processing backup -> verify if we can survive this */
275 u64 z_mcic, o_mcic, t_mcic;
276#ifdef CONFIG_64BIT
277 z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29);
278 o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
279 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
280 1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 |
281 1ULL<<16);
282#else
283 z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<57 | 1ULL<<50 |
284 1ULL<<29);
285 o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
286 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
287 1ULL<<30 | 1ULL<<20 | 1ULL<<17 | 1ULL<<16);
288#endif
289 t_mcic = *(u64 *)mci;
290
291 if (((t_mcic & z_mcic) != 0) ||
292 ((t_mcic & o_mcic) != o_mcic)) {
293 s390_handle_damage("processing backup machine "
294 "check with damage.");
295 }
296
297 /*
298 * Nullifying exigent condition, therefore we might
299 * retry this instruction.
300 */
301 spin_lock(&ipd_lock);
302 tmp = get_clock();
303 if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME)
304 ipd_count++;
305 else
306 ipd_count = 1;
307 last_ipd = tmp;
308 if (ipd_count == MAX_IPD_COUNT)
309 s390_handle_damage("too many ipd retries.");
310 spin_unlock(&ipd_lock);
311 } else {
312 /* Processing damage -> stopping machine */
313 s390_handle_damage("received instruction processing "
314 "damage machine check.");
315 }
316 }
317 if (s390_revalidate_registers(mci)) {
318 if (umode) {
319 /*
320 * Couldn't restore all register contents while in
321 * user mode -> mark task for termination.
322 */
323 mcck->kill_task = 1;
324 mcck->mcck_code = *(unsigned long long *) mci;
325 set_thread_flag(TIF_MCCK_PENDING);
326 } else {
327 /*
328 * Couldn't restore all register contents while in
329 * kernel mode -> stopping machine.
330 */
331 s390_handle_damage("unable to revalidate registers.");
332 }
333 }
334 if (mci->cd) {
335 /* Timing facility damage */
336 s390_handle_damage("TOD clock damaged");
337 }
338 if (mci->ed && mci->ec) {
339 /* External damage */
340 if (S390_lowcore.external_damage_code & (1U << ED_ETR_SYNC))
341 etr_sync_check();
342 if (S390_lowcore.external_damage_code & (1U << ED_ETR_SWITCH))
343 etr_switch_to_local();
344 if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC))
345 stp_sync_check();
346 if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND))
347 stp_island_check();
348 }
349 if (mci->se)
350 /* Storage error uncorrected */
351 s390_handle_damage("received storage error uncorrected "
352 "machine check.");
353 if (mci->ke)
354 /* Storage key-error uncorrected */
355 s390_handle_damage("received storage key-error uncorrected "
356 "machine check.");
357 if (mci->ds && mci->fa)
358 /* Storage degradation */
359 s390_handle_damage("received storage degradation machine "
360 "check.");
361 if (mci->cp) {
362 /* Channel report word pending */
363 mcck->channel_report = 1;
364 set_thread_flag(TIF_MCCK_PENDING);
365 }
366 if (mci->w) {
367 /* Warning pending */
368 mcck->warning = 1;
369 set_thread_flag(TIF_MCCK_PENDING);
370 }
371 lockdep_on();
372}
373
374static int __init machine_check_init(void)
375{
376 ctl_set_bit(14, 25); /* enable external damage MCH */
377 ctl_set_bit(14, 27); /* enable system recovery MCH */
378#ifdef CONFIG_MACHCHK_WARNING
379 ctl_set_bit(14, 24); /* enable warning MCH */
380#endif
381 return 0;
382}
383arch_initcall(machine_check_init);
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index e6b480625cb3..bd616fb31e75 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -39,6 +39,7 @@
39#include <asm/processor.h> 39#include <asm/processor.h>
40#include <asm/irq.h> 40#include <asm/irq.h>
41#include <asm/timer.h> 41#include <asm/timer.h>
42#include <asm/nmi.h>
42#include "entry.h" 43#include "entry.h"
43 44
44asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); 45asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
@@ -68,7 +69,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
68 return sf->gprs[8]; 69 return sf->gprs[8];
69} 70}
70 71
71extern void s390_handle_mcck(void);
72/* 72/*
73 * The idle loop on a S390... 73 * The idle loop on a S390...
74 */ 74 */
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index c55a4b9ffd88..caa4d2877016 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -23,7 +23,7 @@
23#include <linux/timer.h> 23#include <linux/timer.h>
24#include <asm/lowcore.h> 24#include <asm/lowcore.h>
25#include <asm/pgtable.h> 25#include <asm/pgtable.h>
26 26#include <asm/nmi.h>
27#include "kvm-s390.h" 27#include "kvm-s390.h"
28#include "gaccess.h" 28#include "gaccess.h"
29 29
@@ -440,8 +440,6 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
440 return -EINVAL; /* not implemented yet */ 440 return -EINVAL; /* not implemented yet */
441} 441}
442 442
443extern void s390_handle_mcck(void);
444
445static void __vcpu_run(struct kvm_vcpu *vcpu) 443static void __vcpu_run(struct kvm_vcpu *vcpu)
446{ 444{
447 memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16); 445 memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-24 01:27:22 -0500