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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
42
43
44void s390_handle_mcck(void)
45{
46 unsigned long flags;
47 struct mcck_struct mcck;
48
49
50
51
52
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
66
67
68
69
70
71
72
73 if (mcck.warning) {
74 static int mchchk_wng_posted = 0;
75
76
77 __ctl_clear_bit(14, 24);
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
94
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
108
109
110 kill_task = 1;
111 }
112 if (!mci->fp) {
113
114
115
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
139
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
167 asm volatile(
168 " lam 0,15,0(%0)"
169 : : "a" (&S390_lowcore.access_regs_save_area));
170 if (!mci->ar) {
171
172
173
174
175 kill_task = 1;
176 }
177
178 if (!mci->cr) {
179
180
181
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
197
198
199#ifdef CONFIG_64BIT
200
201
202
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
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
222 if (!mci->wp)
223
224
225
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)
237
238#define ED_STP_ISLAND 6
239#define ED_STP_SYNC 7
240#define ED_ETR_SYNC 12
241#define ED_ETR_SWITCH 13
242
243
244
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
266 s390_handle_damage("received system damage machine check.");
267 }
268 if (mci->pd) {
269 if (mci->b) {
270
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
295
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
309 s390_handle_damage("received instruction processing "
310 "damage machine check.");
311 }
312 }
313 if (s390_revalidate_registers(mci)) {
314 if (umode) {
315
316
317
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
325
326
327 s390_handle_damage("unable to revalidate registers.");
328 }
329 }
330 if (mci->cd) {
331
332 s390_handle_damage("TOD clock damaged");
333 }
334 if (mci->ed && mci->ec) {
335
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
347 s390_handle_damage("received storage error uncorrected "
348 "machine check.");
349 if (mci->ke)
350
351 s390_handle_damage("received storage key-error uncorrected "
352 "machine check.");
353 if (mci->ds && mci->fa)
354
355 s390_handle_damage("received storage degradation machine "
356 "check.");
357 if (mci->cp) {
358
359 mcck->channel_report = 1;
360 set_thread_flag(TIF_MCCK_PENDING);
361 }
362 if (mci->w) {
363
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);
373 ctl_set_bit(14, 27);
374 ctl_set_bit(14, 24);
375 return 0;
376}
377arch_initcall(machine_check_init);
378