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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/kernel_stat.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/hardirq.h>
15#include <linux/time.h>
16#include <linux/module.h>
17#include <asm/lowcore.h>
18#include <asm/smp.h>
19#include <asm/etr.h>
20#include <asm/cputime.h>
21#include <asm/nmi.h>
22#include <asm/crw.h>
23
24struct mcck_struct {
25 int kill_task;
26 int channel_report;
27 int warning;
28 unsigned long long mcck_code;
29};
30
31static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck);
32
33static NORET_TYPE void s390_handle_damage(char *msg)
34{
35 smp_send_stop();
36 disabled_wait((unsigned long) __builtin_return_address(0));
37 while (1);
38}
39
40/*
41 * Main machine check handler function. Will be called with interrupts enabled
42 * or disabled and machine checks enabled or disabled.
43 */
44void s390_handle_mcck(void)
45{
46 unsigned long flags;
47 struct mcck_struct mcck;
48
49 /*
50 * Disable machine checks and get the current state of accumulated
51 * machine checks. Afterwards delete the old state and enable machine
52 * checks again.
53 */
54 local_irq_save(flags);
55 local_mcck_disable();
56 mcck = __get_cpu_var(cpu_mcck);
57 memset(&__get_cpu_var(cpu_mcck), 0, sizeof(struct mcck_struct));
58 clear_thread_flag(TIF_MCCK_PENDING);
59 local_mcck_enable();
60 local_irq_restore(flags);
61
62 if (mcck.channel_report)
63 crw_handle_channel_report();
64 /*
65 * A warning may remain for a prolonged period on the bare iron.
66 * (actually until the machine is powered off, or the problem is gone)
67 * So we just stop listening for the WARNING MCH and avoid 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) cpu.
72 */
73 if (mcck.warning) { /* WARNING pending ? */
74 static int mchchk_wng_posted = 0;
75
76 /* Use single cpu clear, as we cannot handle smp here. */
77 __ctl_clear_bit(14, 24); /* Disable WARNING MCH */
78 if (xchg(&mchchk_wng_posted, 1) == 0)
79 kill_cad_pid(SIGPWR, 1);
80 }
81 if (mcck.kill_task) {
82 local_irq_enable();
83 printk(KERN_EMERG "mcck: Terminating task because of machine "
84 "malfunction (code 0x%016llx).\n", mcck.mcck_code);
85 printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
86 current->comm, current->pid);
87 do_exit(SIGSEGV);
88 }
89}
90EXPORT_SYMBOL_GPL(s390_handle_mcck);
91
92/*
93 * returns 0 if all registers could be validated
94 * returns 1 otherwise
95 */
96static int notrace s390_revalidate_registers(struct mci *mci)
97{
98 int kill_task;
99 u64 zero;
100 void *fpt_save_area, *fpt_creg_save_area;
101
102 kill_task = 0;
103 zero = 0;
104
105 if (!mci->gr) {
106 /*
107 * General purpose registers couldn't be restored and have
108 * unknown contents. Process needs to be terminated.
109 */
110 kill_task = 1;
111 }
112 if (!mci->fp) {
113 /*
114 * Floating point registers can't be restored and
115 * therefore the process needs to be terminated.
116 */
117 kill_task = 1;
118 }
119#ifndef CONFIG_64BIT
120 asm volatile(
121 " ld 0,0(%0)\n"
122 " ld 2,8(%0)\n"
123 " ld 4,16(%0)\n"
124 " ld 6,24(%0)"
125 : : "a" (&S390_lowcore.floating_pt_save_area));
126#endif
127
128 if (MACHINE_HAS_IEEE) {
129#ifdef CONFIG_64BIT
130 fpt_save_area = &S390_lowcore.floating_pt_save_area;
131 fpt_creg_save_area = &S390_lowcore.fpt_creg_save_area;
132#else
133 fpt_save_area = (void *) S390_lowcore.extended_save_area_addr;
134 fpt_creg_save_area = fpt_save_area + 128;
135#endif
136 if (!mci->fc) {
137 /*
138 * Floating point control register can't be restored.
139 * Task will be terminated.
140 */
141 asm volatile("lfpc 0(%0)" : : "a" (&zero), "m" (zero));
142 kill_task = 1;
143
144 } else
145 asm volatile("lfpc 0(%0)" : : "a" (fpt_creg_save_area));
146
147 asm volatile(
148 " ld 0,0(%0)\n"
149 " ld 1,8(%0)\n"
150 " ld 2,16(%0)\n"
151 " ld 3,24(%0)\n"
152 " ld 4,32(%0)\n"
153 " ld 5,40(%0)\n"
154 " ld 6,48(%0)\n"
155 " ld 7,56(%0)\n"
156 " ld 8,64(%0)\n"
157 " ld 9,72(%0)\n"
158 " ld 10,80(%0)\n"
159 " ld 11,88(%0)\n"
160 " ld 12,96(%0)\n"
161 " ld 13,104(%0)\n"
162 " ld 14,112(%0)\n"
163 " ld 15,120(%0)\n"
164 : : "a" (fpt_save_area));
165 }
166 /* Revalidate access registers */
167 asm volatile(
168 " lam 0,15,0(%0)"
169 : : "a" (&S390_lowcore.access_regs_save_area));
170 if (!mci->ar) {
171 /*
172 * Access registers have unknown contents.
173 * Terminating task.
174 */
175 kill_task = 1;
176 }
177 /* Revalidate control registers */
178 if (!mci->cr) {
179 /*
180 * Control registers have unknown contents.
181 * Can't recover and therefore stopping machine.
182 */
183 s390_handle_damage("invalid control registers.");
184 } else {
185#ifdef CONFIG_64BIT
186 asm volatile(
187 " lctlg 0,15,0(%0)"
188 : : "a" (&S390_lowcore.cregs_save_area));
189#else
190 asm volatile(
191 " lctl 0,15,0(%0)"
192 : : "a" (&S390_lowcore.cregs_save_area));
193#endif
194 }
195 /*
196 * We don't even try to revalidate the TOD register, since we simply
197 * can't write something sensible into that register.
198 */
199#ifdef CONFIG_64BIT
200 /*
201 * See if we can revalidate the TOD programmable register with its
202 * old contents (should be zero) otherwise set it to zero.
203 */
204 if (!mci->pr)
205 asm volatile(
206 " sr 0,0\n"
207 " sckpf"
208 : : : "0", "cc");
209 else
210 asm volatile(
211 " l 0,0(%0)\n"
212 " sckpf"
213 : : "a" (&S390_lowcore.tod_progreg_save_area)
214 : "0", "cc");
215#endif
216 /* Revalidate clock comparator register */
217 if (S390_lowcore.clock_comparator == -1)
218 set_clock_comparator(S390_lowcore.mcck_clock);
219 else
220 set_clock_comparator(S390_lowcore.clock_comparator);
221 /* Check if old PSW is valid */
222 if (!mci->wp)
223 /*
224 * Can't tell if we come from user or kernel mode
225 * -> stopping machine.
226 */
227 s390_handle_damage("old psw invalid.");
228
229 if (!mci->ms || !mci->pm || !mci->ia)
230 kill_task = 1;
231
232 return kill_task;
233}
234
235#define MAX_IPD_COUNT 29
236#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */
237
238#define ED_STP_ISLAND 6 /* External damage STP island check */
239#define ED_STP_SYNC 7 /* External damage STP sync check */
240#define ED_ETR_SYNC 12 /* External damage ETR sync check */
241#define ED_ETR_SWITCH 13 /* External damage ETR switch to local */
242
243/*
244 * machine check handler.
245 */
246void notrace s390_do_machine_check(struct pt_regs *regs)
247{
248 static int ipd_count;
249 static DEFINE_SPINLOCK(ipd_lock);
250 static unsigned long long last_ipd;
251 struct mcck_struct *mcck;
252 unsigned long long tmp;
253 struct mci *mci;
254 int umode;
255
256 nmi_enter();
257 s390_idle_check(regs, S390_lowcore.mcck_clock,
258 S390_lowcore.mcck_enter_timer);
259 kstat_cpu(smp_processor_id()).irqs[NMI_NMI]++;
260 mci = (struct mci *) &S390_lowcore.mcck_interruption_code;
261 mcck = &__get_cpu_var(cpu_mcck);
262 umode = user_mode(regs);
263
264 if (mci->sd) {
265 /* System damage -> stopping machine */
266 s390_handle_damage("received system damage machine check.");
267 }
268 if (mci->pd) {
269 if (mci->b) {
270 /* Processing backup -> verify if we can survive this */
271 u64 z_mcic, o_mcic, t_mcic;
272#ifdef CONFIG_64BIT
273 z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29);
274 o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
275 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
276 1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 |
277 1ULL<<16);
278#else
279 z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<57 | 1ULL<<50 |
280 1ULL<<29);
281 o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
282 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
283 1ULL<<30 | 1ULL<<20 | 1ULL<<17 | 1ULL<<16);
284#endif
285 t_mcic = *(u64 *)mci;
286
287 if (((t_mcic & z_mcic) != 0) ||
288 ((t_mcic & o_mcic) != o_mcic)) {
289 s390_handle_damage("processing backup machine "
290 "check with damage.");
291 }
292
293 /*
294 * Nullifying exigent condition, therefore we might
295 * retry this instruction.
296 */
297 spin_lock(&ipd_lock);
298 tmp = get_clock();
299 if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME)
300 ipd_count++;
301 else
302 ipd_count = 1;
303 last_ipd = tmp;
304 if (ipd_count == MAX_IPD_COUNT)
305 s390_handle_damage("too many ipd retries.");
306 spin_unlock(&ipd_lock);
307 } else {
308 /* Processing damage -> stopping machine */
309 s390_handle_damage("received instruction processing "
310 "damage machine check.");
311 }
312 }
313 if (s390_revalidate_registers(mci)) {
314 if (umode) {
315 /*
316 * Couldn't restore all register contents while in
317 * user mode -> mark task for termination.
318 */
319 mcck->kill_task = 1;
320 mcck->mcck_code = *(unsigned long long *) mci;
321 set_thread_flag(TIF_MCCK_PENDING);
322 } else {
323 /*
324 * Couldn't restore all register contents while in
325 * kernel mode -> stopping machine.
326 */
327 s390_handle_damage("unable to revalidate registers.");
328 }
329 }
330 if (mci->cd) {
331 /* Timing facility damage */
332 s390_handle_damage("TOD clock damaged");
333 }
334 if (mci->ed && mci->ec) {
335 /* External damage */
336 if (S390_lowcore.external_damage_code & (1U << ED_ETR_SYNC))
337 etr_sync_check();
338 if (S390_lowcore.external_damage_code & (1U << ED_ETR_SWITCH))
339 etr_switch_to_local();
340 if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC))
341 stp_sync_check();
342 if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND))
343 stp_island_check();
344 }
345 if (mci->se)
346 /* Storage error uncorrected */
347 s390_handle_damage("received storage error uncorrected "
348 "machine check.");
349 if (mci->ke)
350 /* Storage key-error uncorrected */
351 s390_handle_damage("received storage key-error uncorrected "
352 "machine check.");
353 if (mci->ds && mci->fa)
354 /* Storage degradation */
355 s390_handle_damage("received storage degradation machine "
356 "check.");
357 if (mci->cp) {
358 /* Channel report word pending */
359 mcck->channel_report = 1;
360 set_thread_flag(TIF_MCCK_PENDING);
361 }
362 if (mci->w) {
363 /* Warning pending */
364 mcck->warning = 1;
365 set_thread_flag(TIF_MCCK_PENDING);
366 }
367 nmi_exit();
368}
369
370static int __init machine_check_init(void)
371{
372 ctl_set_bit(14, 25); /* enable external damage MCH */
373 ctl_set_bit(14, 27); /* enable system recovery MCH */
374 ctl_set_bit(14, 24); /* enable warning MCH */
375 return 0;
376}
377arch_initcall(machine_check_init);
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/kernel_stat.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/hardirq.h>
15#include <linux/time.h>
16#include <linux/module.h>
17#include <asm/lowcore.h>
18#include <asm/smp.h>
19#include <asm/stp.h>
20#include <asm/cputime.h>
21#include <asm/nmi.h>
22#include <asm/crw.h>
23#include <asm/switch_to.h>
24#include <asm/ctl_reg.h>
25
26struct mcck_struct {
27 unsigned int kill_task : 1;
28 unsigned int channel_report : 1;
29 unsigned int warning : 1;
30 unsigned int stp_queue : 1;
31 unsigned long mcck_code;
32};
33
34static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck);
35
36static void s390_handle_damage(void)
37{
38 smp_send_stop();
39 disabled_wait((unsigned long) __builtin_return_address(0));
40 while (1);
41}
42
43/*
44 * Main machine check handler function. Will be called with interrupts enabled
45 * or disabled and machine checks enabled or disabled.
46 */
47void s390_handle_mcck(void)
48{
49 unsigned long flags;
50 struct mcck_struct mcck;
51
52 /*
53 * Disable machine checks and get the current state of accumulated
54 * machine checks. Afterwards delete the old state and enable machine
55 * checks again.
56 */
57 local_irq_save(flags);
58 local_mcck_disable();
59 mcck = *this_cpu_ptr(&cpu_mcck);
60 memset(this_cpu_ptr(&cpu_mcck), 0, sizeof(mcck));
61 clear_cpu_flag(CIF_MCCK_PENDING);
62 local_mcck_enable();
63 local_irq_restore(flags);
64
65 if (mcck.channel_report)
66 crw_handle_channel_report();
67 /*
68 * A warning may remain for a prolonged period on the bare iron.
69 * (actually until the machine is powered off, or the problem is gone)
70 * So we just stop listening for the WARNING MCH and avoid continuously
71 * being interrupted. One caveat is however, that we must do this per
72 * processor and cannot use the smp version of ctl_clear_bit().
73 * On VM we only get one interrupt per virtally presented machinecheck.
74 * Though one suffices, we may get one interrupt per (virtual) cpu.
75 */
76 if (mcck.warning) { /* WARNING pending ? */
77 static int mchchk_wng_posted = 0;
78
79 /* Use single cpu clear, as we cannot handle smp here. */
80 __ctl_clear_bit(14, 24); /* Disable WARNING MCH */
81 if (xchg(&mchchk_wng_posted, 1) == 0)
82 kill_cad_pid(SIGPWR, 1);
83 }
84 if (mcck.stp_queue)
85 stp_queue_work();
86 if (mcck.kill_task) {
87 local_irq_enable();
88 printk(KERN_EMERG "mcck: Terminating task because of machine "
89 "malfunction (code 0x%016lx).\n", mcck.mcck_code);
90 printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
91 current->comm, current->pid);
92 do_exit(SIGSEGV);
93 }
94}
95EXPORT_SYMBOL_GPL(s390_handle_mcck);
96
97/*
98 * returns 0 if all registers could be validated
99 * returns 1 otherwise
100 */
101static int notrace s390_validate_registers(union mci mci, int umode)
102{
103 int kill_task;
104 u64 zero;
105 void *fpt_save_area;
106
107 kill_task = 0;
108 zero = 0;
109
110 if (!mci.gr) {
111 /*
112 * General purpose registers couldn't be restored and have
113 * unknown contents. Stop system or terminate process.
114 */
115 if (!umode)
116 s390_handle_damage();
117 kill_task = 1;
118 }
119 if (!mci.fp) {
120 /*
121 * Floating point registers can't be restored. If the
122 * kernel currently uses floating point registers the
123 * system is stopped. If the process has its floating
124 * pointer registers loaded it is terminated.
125 * Otherwise just revalidate the registers.
126 */
127 if (S390_lowcore.fpu_flags & KERNEL_VXR_V0V7)
128 s390_handle_damage();
129 if (!test_cpu_flag(CIF_FPU))
130 kill_task = 1;
131 }
132 fpt_save_area = &S390_lowcore.floating_pt_save_area;
133 if (!mci.fc) {
134 /*
135 * Floating point control register can't be restored.
136 * If the kernel currently uses the floating pointer
137 * registers and needs the FPC register the system is
138 * stopped. If the process has its floating pointer
139 * registers loaded it is terminated. Otherwiese the
140 * FPC is just revalidated.
141 */
142 if (S390_lowcore.fpu_flags & KERNEL_FPC)
143 s390_handle_damage();
144 asm volatile("lfpc %0" : : "Q" (zero));
145 if (!test_cpu_flag(CIF_FPU))
146 kill_task = 1;
147 } else {
148 asm volatile("lfpc %0"
149 : : "Q" (S390_lowcore.fpt_creg_save_area));
150 }
151
152 if (!MACHINE_HAS_VX) {
153 /* Validate floating point registers */
154 asm volatile(
155 " ld 0,0(%0)\n"
156 " ld 1,8(%0)\n"
157 " ld 2,16(%0)\n"
158 " ld 3,24(%0)\n"
159 " ld 4,32(%0)\n"
160 " ld 5,40(%0)\n"
161 " ld 6,48(%0)\n"
162 " ld 7,56(%0)\n"
163 " ld 8,64(%0)\n"
164 " ld 9,72(%0)\n"
165 " ld 10,80(%0)\n"
166 " ld 11,88(%0)\n"
167 " ld 12,96(%0)\n"
168 " ld 13,104(%0)\n"
169 " ld 14,112(%0)\n"
170 " ld 15,120(%0)\n"
171 : : "a" (fpt_save_area) : "memory");
172 } else {
173 /* Validate vector registers */
174 union ctlreg0 cr0;
175
176 if (!mci.vr) {
177 /*
178 * Vector registers can't be restored. If the kernel
179 * currently uses vector registers the system is
180 * stopped. If the process has its vector registers
181 * loaded it is terminated. Otherwise just revalidate
182 * the registers.
183 */
184 if (S390_lowcore.fpu_flags & KERNEL_VXR)
185 s390_handle_damage();
186 if (!test_cpu_flag(CIF_FPU))
187 kill_task = 1;
188 }
189 cr0.val = S390_lowcore.cregs_save_area[0];
190 cr0.afp = cr0.vx = 1;
191 __ctl_load(cr0.val, 0, 0);
192 asm volatile(
193 " la 1,%0\n"
194 " .word 0xe70f,0x1000,0x0036\n" /* vlm 0,15,0(1) */
195 " .word 0xe70f,0x1100,0x0c36\n" /* vlm 16,31,256(1) */
196 : : "Q" (*(struct vx_array *)
197 &S390_lowcore.vector_save_area) : "1");
198 __ctl_load(S390_lowcore.cregs_save_area[0], 0, 0);
199 }
200 /* Validate access registers */
201 asm volatile(
202 " lam 0,15,0(%0)"
203 : : "a" (&S390_lowcore.access_regs_save_area));
204 if (!mci.ar) {
205 /*
206 * Access registers have unknown contents.
207 * Terminating task.
208 */
209 kill_task = 1;
210 }
211 /* Validate control registers */
212 if (!mci.cr) {
213 /*
214 * Control registers have unknown contents.
215 * Can't recover and therefore stopping machine.
216 */
217 s390_handle_damage();
218 } else {
219 asm volatile(
220 " lctlg 0,15,0(%0)"
221 : : "a" (&S390_lowcore.cregs_save_area) : "memory");
222 }
223 /*
224 * We don't even try to validate the TOD register, since we simply
225 * can't write something sensible into that register.
226 */
227 /*
228 * See if we can validate the TOD programmable register with its
229 * old contents (should be zero) otherwise set it to zero.
230 */
231 if (!mci.pr)
232 asm volatile(
233 " sr 0,0\n"
234 " sckpf"
235 : : : "0", "cc");
236 else
237 asm volatile(
238 " l 0,%0\n"
239 " sckpf"
240 : : "Q" (S390_lowcore.tod_progreg_save_area)
241 : "0", "cc");
242 /* Validate clock comparator register */
243 set_clock_comparator(S390_lowcore.clock_comparator);
244 /* Check if old PSW is valid */
245 if (!mci.wp)
246 /*
247 * Can't tell if we come from user or kernel mode
248 * -> stopping machine.
249 */
250 s390_handle_damage();
251
252 if (!mci.ms || !mci.pm || !mci.ia)
253 kill_task = 1;
254
255 return kill_task;
256}
257
258#define MAX_IPD_COUNT 29
259#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */
260
261#define ED_STP_ISLAND 6 /* External damage STP island check */
262#define ED_STP_SYNC 7 /* External damage STP sync check */
263
264/*
265 * machine check handler.
266 */
267void notrace s390_do_machine_check(struct pt_regs *regs)
268{
269 static int ipd_count;
270 static DEFINE_SPINLOCK(ipd_lock);
271 static unsigned long long last_ipd;
272 struct mcck_struct *mcck;
273 unsigned long long tmp;
274 union mci mci;
275
276 nmi_enter();
277 inc_irq_stat(NMI_NMI);
278 mci.val = S390_lowcore.mcck_interruption_code;
279 mcck = this_cpu_ptr(&cpu_mcck);
280
281 if (mci.sd) {
282 /* System damage -> stopping machine */
283 s390_handle_damage();
284 }
285 if (mci.pd) {
286 if (mci.b) {
287 /* Processing backup -> verify if we can survive this */
288 u64 z_mcic, o_mcic, t_mcic;
289 z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29);
290 o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
291 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
292 1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 |
293 1ULL<<16);
294 t_mcic = mci.val;
295
296 if (((t_mcic & z_mcic) != 0) ||
297 ((t_mcic & o_mcic) != o_mcic)) {
298 s390_handle_damage();
299 }
300
301 /*
302 * Nullifying exigent condition, therefore we might
303 * retry this instruction.
304 */
305 spin_lock(&ipd_lock);
306 tmp = get_tod_clock();
307 if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME)
308 ipd_count++;
309 else
310 ipd_count = 1;
311 last_ipd = tmp;
312 if (ipd_count == MAX_IPD_COUNT)
313 s390_handle_damage();
314 spin_unlock(&ipd_lock);
315 } else {
316 /* Processing damage -> stopping machine */
317 s390_handle_damage();
318 }
319 }
320 if (s390_validate_registers(mci, user_mode(regs))) {
321 /*
322 * Couldn't restore all register contents for the
323 * user space process -> mark task for termination.
324 */
325 mcck->kill_task = 1;
326 mcck->mcck_code = mci.val;
327 set_cpu_flag(CIF_MCCK_PENDING);
328 }
329 if (mci.cd) {
330 /* Timing facility damage */
331 s390_handle_damage();
332 }
333 if (mci.ed && mci.ec) {
334 /* External damage */
335 if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC))
336 mcck->stp_queue |= stp_sync_check();
337 if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND))
338 mcck->stp_queue |= stp_island_check();
339 if (mcck->stp_queue)
340 set_cpu_flag(CIF_MCCK_PENDING);
341 }
342 if (mci.se)
343 /* Storage error uncorrected */
344 s390_handle_damage();
345 if (mci.ke)
346 /* Storage key-error uncorrected */
347 s390_handle_damage();
348 if (mci.ds && mci.fa)
349 /* Storage degradation */
350 s390_handle_damage();
351 if (mci.cp) {
352 /* Channel report word pending */
353 mcck->channel_report = 1;
354 set_cpu_flag(CIF_MCCK_PENDING);
355 }
356 if (mci.w) {
357 /* Warning pending */
358 mcck->warning = 1;
359 set_cpu_flag(CIF_MCCK_PENDING);
360 }
361 nmi_exit();
362}
363
364static int __init machine_check_init(void)
365{
366 ctl_set_bit(14, 25); /* enable external damage MCH */
367 ctl_set_bit(14, 27); /* enable system recovery MCH */
368 ctl_set_bit(14, 24); /* enable warning MCH */
369 return 0;
370}
371early_initcall(machine_check_init);