1a17ae4c3SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
2f5daba1dSHeiko Carstens /*
3f5daba1dSHeiko Carstens * Machine check handler
4f5daba1dSHeiko Carstens *
5f5daba1dSHeiko Carstens * Copyright IBM Corp. 2000, 2009
6f5daba1dSHeiko Carstens * Author(s): Ingo Adlung <adlung@de.ibm.com>,
7f5daba1dSHeiko Carstens * Martin Schwidefsky <schwidefsky@de.ibm.com>,
8f5daba1dSHeiko Carstens * Cornelia Huck <cornelia.huck@de.ibm.com>,
9f5daba1dSHeiko Carstens */
10f5daba1dSHeiko Carstens
11052ff461SHeiko Carstens #include <linux/kernel_stat.h>
12f5daba1dSHeiko Carstens #include <linux/init.h>
13f5daba1dSHeiko Carstens #include <linux/errno.h>
14520763a3SSven Schnelle #include <linux/entry-common.h>
1581f64b87SHeiko Carstens #include <linux/hardirq.h>
166c81511cSMartin Schwidefsky #include <linux/log2.h>
1700a8f886SMartin Schwidefsky #include <linux/kprobes.h>
18514c6032SRandy Dunlap #include <linux/kmemleak.h>
19f5daba1dSHeiko Carstens #include <linux/time.h>
203f07c014SIngo Molnar #include <linux/module.h>
213f07c014SIngo Molnar #include <linux/sched/signal.h>
225720aab2SHeiko Carstens #include <linux/kvm_host.h>
233994a52bSPaul Gortmaker #include <linux/export.h>
24f5daba1dSHeiko Carstens #include <asm/lowcore.h>
25f5daba1dSHeiko Carstens #include <asm/smp.h>
26fd5ada04SMartin Schwidefsky #include <asm/stp.h>
2776d4e00aSMartin Schwidefsky #include <asm/cputime.h>
28f5daba1dSHeiko Carstens #include <asm/nmi.h>
29f5daba1dSHeiko Carstens #include <asm/crw.h>
3080703617SMartin Schwidefsky #include <asm/switch_to.h>
31cad49cfcSHeiko Carstens #include <asm/ctl_reg.h>
32c929500dSQingFeng Hao #include <asm/asm-offsets.h>
3339d62336SThomas Richter #include <asm/pai.h>
345720aab2SHeiko Carstens #include <asm/vx-insn.h>
35f5daba1dSHeiko Carstens
36f5daba1dSHeiko Carstens struct mcck_struct {
3736324963SHeiko Carstens unsigned int kill_task : 1;
3836324963SHeiko Carstens unsigned int channel_report : 1;
3936324963SHeiko Carstens unsigned int warning : 1;
4029b0a825SHeiko Carstens unsigned int stp_queue : 1;
41dc6e1555SHeiko Carstens unsigned long mcck_code;
42f5daba1dSHeiko Carstens };
43f5daba1dSHeiko Carstens
44f5daba1dSHeiko Carstens static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck);
456c81511cSMartin Schwidefsky
nmi_needs_mcesa(void)466c81511cSMartin Schwidefsky static inline int nmi_needs_mcesa(void)
476c81511cSMartin Schwidefsky {
486c81511cSMartin Schwidefsky return MACHINE_HAS_VX || MACHINE_HAS_GS;
496c81511cSMartin Schwidefsky }
506c81511cSMartin Schwidefsky
516c81511cSMartin Schwidefsky /*
526c81511cSMartin Schwidefsky * The initial machine check extended save area for the boot CPU.
53c7ed509bSAlexander Gordeev * It will be replaced on the boot CPU reinit with an allocated
54c7ed509bSAlexander Gordeev * structure. The structure is required for machine check happening
55c7ed509bSAlexander Gordeev * early in the boot process.
566c81511cSMartin Schwidefsky */
5712dd19c1SAlexander Gordeev static struct mcesa boot_mcesa __aligned(MCESA_MAX_SIZE);
586c81511cSMartin Schwidefsky
nmi_alloc_mcesa_early(u64 * mcesad)59c7ed509bSAlexander Gordeev void __init nmi_alloc_mcesa_early(u64 *mcesad)
606c81511cSMartin Schwidefsky {
616c81511cSMartin Schwidefsky if (!nmi_needs_mcesa())
626c81511cSMartin Schwidefsky return;
63c7ed509bSAlexander Gordeev *mcesad = __pa(&boot_mcesa);
646c81511cSMartin Schwidefsky if (MACHINE_HAS_GS)
65c7ed509bSAlexander Gordeev *mcesad |= ilog2(MCESA_MAX_SIZE);
666c81511cSMartin Schwidefsky }
676c81511cSMartin Schwidefsky
nmi_alloc_mcesa(u64 * mcesad)68bb3860ccSHeiko Carstens int nmi_alloc_mcesa(u64 *mcesad)
696c81511cSMartin Schwidefsky {
70c7ed509bSAlexander Gordeev unsigned long size;
71bb3860ccSHeiko Carstens void *origin;
726c81511cSMartin Schwidefsky
73c7ed509bSAlexander Gordeev *mcesad = 0;
746c81511cSMartin Schwidefsky if (!nmi_needs_mcesa())
756c81511cSMartin Schwidefsky return 0;
76bb3860ccSHeiko Carstens size = MACHINE_HAS_GS ? MCESA_MAX_SIZE : MCESA_MIN_SIZE;
77bb3860ccSHeiko Carstens origin = kmalloc(size, GFP_KERNEL);
786c81511cSMartin Schwidefsky if (!origin)
796c81511cSMartin Schwidefsky return -ENOMEM;
806c81511cSMartin Schwidefsky /* The pointer is stored with mcesa_bits ORed in */
81bb3860ccSHeiko Carstens kmemleak_not_leak(origin);
82bb3860ccSHeiko Carstens *mcesad = __pa(origin);
83bb3860ccSHeiko Carstens if (MACHINE_HAS_GS)
84bb3860ccSHeiko Carstens *mcesad |= ilog2(MCESA_MAX_SIZE);
856c81511cSMartin Schwidefsky return 0;
866c81511cSMartin Schwidefsky }
876c81511cSMartin Schwidefsky
nmi_free_mcesa(u64 * mcesad)88c7ed509bSAlexander Gordeev void nmi_free_mcesa(u64 *mcesad)
896c81511cSMartin Schwidefsky {
906c81511cSMartin Schwidefsky if (!nmi_needs_mcesa())
916c81511cSMartin Schwidefsky return;
92bb3860ccSHeiko Carstens kfree(__va(*mcesad & MCESA_ORIGIN_MASK));
936c81511cSMartin Schwidefsky }
94f5daba1dSHeiko Carstens
nmi_puts(char * dest,const char * src)95506faa5bSHeiko Carstens static __always_inline char *nmi_puts(char *dest, const char *src)
96506faa5bSHeiko Carstens {
97506faa5bSHeiko Carstens while (*src)
98506faa5bSHeiko Carstens *dest++ = *src++;
99506faa5bSHeiko Carstens *dest = 0;
100506faa5bSHeiko Carstens return dest;
101506faa5bSHeiko Carstens }
102506faa5bSHeiko Carstens
u64_to_hex(char * dest,u64 val)103506faa5bSHeiko Carstens static __always_inline char *u64_to_hex(char *dest, u64 val)
104506faa5bSHeiko Carstens {
105506faa5bSHeiko Carstens int i, num;
106506faa5bSHeiko Carstens
107506faa5bSHeiko Carstens for (i = 1; i <= 16; i++) {
108506faa5bSHeiko Carstens num = (val >> (64 - 4 * i)) & 0xf;
109506faa5bSHeiko Carstens if (num >= 10)
110506faa5bSHeiko Carstens *dest++ = 'A' + num - 10;
111506faa5bSHeiko Carstens else
112506faa5bSHeiko Carstens *dest++ = '0' + num;
113506faa5bSHeiko Carstens }
114506faa5bSHeiko Carstens *dest = 0;
115506faa5bSHeiko Carstens return dest;
116506faa5bSHeiko Carstens }
117506faa5bSHeiko Carstens
s390_handle_damage(void)11800a8f886SMartin Schwidefsky static notrace void s390_handle_damage(void)
119f5daba1dSHeiko Carstens {
120506faa5bSHeiko Carstens union ctlreg0 cr0, cr0_new;
121506faa5bSHeiko Carstens char message[100];
122506faa5bSHeiko Carstens psw_t psw_save;
123506faa5bSHeiko Carstens char *ptr;
124506faa5bSHeiko Carstens
12500a8f886SMartin Schwidefsky smp_emergency_stop();
126506faa5bSHeiko Carstens diag_amode31_ops.diag308_reset();
127506faa5bSHeiko Carstens ptr = nmi_puts(message, "System stopped due to unrecoverable machine check, code: 0x");
128506faa5bSHeiko Carstens u64_to_hex(ptr, S390_lowcore.mcck_interruption_code);
129506faa5bSHeiko Carstens
130506faa5bSHeiko Carstens /*
131506faa5bSHeiko Carstens * Disable low address protection and make machine check new PSW a
132506faa5bSHeiko Carstens * disabled wait PSW. Any additional machine check cannot be handled.
133506faa5bSHeiko Carstens */
134506faa5bSHeiko Carstens __ctl_store(cr0.val, 0, 0);
135506faa5bSHeiko Carstens cr0_new = cr0;
136506faa5bSHeiko Carstens cr0_new.lap = 0;
137506faa5bSHeiko Carstens __ctl_load(cr0_new.val, 0, 0);
138506faa5bSHeiko Carstens psw_save = S390_lowcore.mcck_new_psw;
139506faa5bSHeiko Carstens psw_bits(S390_lowcore.mcck_new_psw).io = 0;
140506faa5bSHeiko Carstens psw_bits(S390_lowcore.mcck_new_psw).ext = 0;
141506faa5bSHeiko Carstens psw_bits(S390_lowcore.mcck_new_psw).wait = 1;
142506faa5bSHeiko Carstens sclp_emergency_printk(message);
143506faa5bSHeiko Carstens
144506faa5bSHeiko Carstens /*
145506faa5bSHeiko Carstens * Restore machine check new PSW and control register 0 to original
146506faa5bSHeiko Carstens * values. This makes possible system dump analysis easier.
147506faa5bSHeiko Carstens */
148506faa5bSHeiko Carstens S390_lowcore.mcck_new_psw = psw_save;
149506faa5bSHeiko Carstens __ctl_load(cr0.val, 0, 0);
15098587c2dSMartin Schwidefsky disabled_wait();
151f5daba1dSHeiko Carstens while (1);
152f5daba1dSHeiko Carstens }
15300a8f886SMartin Schwidefsky NOKPROBE_SYMBOL(s390_handle_damage);
154f5daba1dSHeiko Carstens
155f5daba1dSHeiko Carstens /*
15656e62a73SSven Schnelle * Main machine check handler function. Will be called with interrupts disabled
15756e62a73SSven Schnelle * and machine checks enabled.
158f5daba1dSHeiko Carstens */
s390_handle_mcck(void)159*e7ec1d2eSAlexander Gordeev void s390_handle_mcck(void)
160f5daba1dSHeiko Carstens {
161f5daba1dSHeiko Carstens struct mcck_struct mcck;
162f5daba1dSHeiko Carstens
163f5daba1dSHeiko Carstens /*
164f5daba1dSHeiko Carstens * Disable machine checks and get the current state of accumulated
165f5daba1dSHeiko Carstens * machine checks. Afterwards delete the old state and enable machine
166f5daba1dSHeiko Carstens * checks again.
167f5daba1dSHeiko Carstens */
168f5daba1dSHeiko Carstens local_mcck_disable();
1692cb4a182SSebastian Ott mcck = *this_cpu_ptr(&cpu_mcck);
1702cb4a182SSebastian Ott memset(this_cpu_ptr(&cpu_mcck), 0, sizeof(mcck));
171f5daba1dSHeiko Carstens local_mcck_enable();
172f5daba1dSHeiko Carstens
173f5daba1dSHeiko Carstens if (mcck.channel_report)
174f5daba1dSHeiko Carstens crw_handle_channel_report();
175f5daba1dSHeiko Carstens /*
1767b886416SHeiko Carstens * A warning may remain for a prolonged period on the bare iron.
1777b886416SHeiko Carstens * (actually until the machine is powered off, or the problem is gone)
1787b886416SHeiko Carstens * So we just stop listening for the WARNING MCH and avoid continuously
179f5daba1dSHeiko Carstens * being interrupted. One caveat is however, that we must do this per
180f5daba1dSHeiko Carstens * processor and cannot use the smp version of ctl_clear_bit().
181f5daba1dSHeiko Carstens * On VM we only get one interrupt per virtally presented machinecheck.
1827b886416SHeiko Carstens * Though one suffices, we may get one interrupt per (virtual) cpu.
183f5daba1dSHeiko Carstens */
184f5daba1dSHeiko Carstens if (mcck.warning) { /* WARNING pending ? */
185f5daba1dSHeiko Carstens static int mchchk_wng_posted = 0;
1867b886416SHeiko Carstens
1877b886416SHeiko Carstens /* Use single cpu clear, as we cannot handle smp here. */
188f5daba1dSHeiko Carstens __ctl_clear_bit(14, 24); /* Disable WARNING MCH */
189f5daba1dSHeiko Carstens if (xchg(&mchchk_wng_posted, 1) == 0)
190f5daba1dSHeiko Carstens kill_cad_pid(SIGPWR, 1);
191f5daba1dSHeiko Carstens }
19229b0a825SHeiko Carstens if (mcck.stp_queue)
19329b0a825SHeiko Carstens stp_queue_work();
194f5daba1dSHeiko Carstens if (mcck.kill_task) {
195f5daba1dSHeiko Carstens printk(KERN_EMERG "mcck: Terminating task because of machine "
196dc6e1555SHeiko Carstens "malfunction (code 0x%016lx).\n", mcck.mcck_code);
197f5daba1dSHeiko Carstens printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
198f5daba1dSHeiko Carstens current->comm, current->pid);
199*e7ec1d2eSAlexander Gordeev if (is_global_init(current))
200*e7ec1d2eSAlexander Gordeev panic("mcck: Attempting to kill init!\n");
201*e7ec1d2eSAlexander Gordeev do_send_sig_info(SIGKILL, SEND_SIG_PRIV, current, PIDTYPE_PID);
202f5daba1dSHeiko Carstens }
203f5daba1dSHeiko Carstens }
204f5daba1dSHeiko Carstens
205f5daba1dSHeiko Carstens /*
206f9e5938aSHeiko Carstens * returns 0 if register contents could be validated
207f5daba1dSHeiko Carstens * returns 1 otherwise
208f5daba1dSHeiko Carstens */
s390_validate_registers(union mci mci)209f9e5938aSHeiko Carstens static int notrace s390_validate_registers(union mci mci)
210f5daba1dSHeiko Carstens {
2115fa2ea07SAlexander Gordeev struct mcesa *mcesa;
2125fa2ea07SAlexander Gordeev void *fpt_save_area;
213ad3bc0acSMartin Schwidefsky union ctlreg2 cr2;
214f5daba1dSHeiko Carstens int kill_task;
2155fa2ea07SAlexander Gordeev u64 zero;
216f5daba1dSHeiko Carstens
217f5daba1dSHeiko Carstens kill_task = 0;
2185fa2ea07SAlexander Gordeev zero = 0;
219f5daba1dSHeiko Carstens
220f9e5938aSHeiko Carstens if (!mci.gr || !mci.fp)
221f5daba1dSHeiko Carstens kill_task = 1;
2225fa2ea07SAlexander Gordeev fpt_save_area = &S390_lowcore.floating_pt_save_area;
223dc6e1555SHeiko Carstens if (!mci.fc) {
224f9e5938aSHeiko Carstens kill_task = 1;
2255fa2ea07SAlexander Gordeev asm volatile(
2265fa2ea07SAlexander Gordeev " lfpc %0\n"
2275fa2ea07SAlexander Gordeev :
2285fa2ea07SAlexander Gordeev : "Q" (zero));
2295fa2ea07SAlexander Gordeev } else {
2305fa2ea07SAlexander Gordeev asm volatile(
2315fa2ea07SAlexander Gordeev " lfpc %0\n"
2325fa2ea07SAlexander Gordeev :
2335fa2ea07SAlexander Gordeev : "Q" (S390_lowcore.fpt_creg_save_area));
23486fa7087SHeiko Carstens }
235f5daba1dSHeiko Carstens
236402ff5a3SHeiko Carstens mcesa = __va(S390_lowcore.mcesad & MCESA_ORIGIN_MASK);
2375fa2ea07SAlexander Gordeev if (!MACHINE_HAS_VX) {
2385fa2ea07SAlexander Gordeev /* Validate floating point registers */
2395fa2ea07SAlexander Gordeev asm volatile(
2405fa2ea07SAlexander Gordeev " ld 0,0(%0)\n"
2415fa2ea07SAlexander Gordeev " ld 1,8(%0)\n"
2425fa2ea07SAlexander Gordeev " ld 2,16(%0)\n"
2435fa2ea07SAlexander Gordeev " ld 3,24(%0)\n"
2445fa2ea07SAlexander Gordeev " ld 4,32(%0)\n"
2455fa2ea07SAlexander Gordeev " ld 5,40(%0)\n"
2465fa2ea07SAlexander Gordeev " ld 6,48(%0)\n"
2475fa2ea07SAlexander Gordeev " ld 7,56(%0)\n"
2485fa2ea07SAlexander Gordeev " ld 8,64(%0)\n"
2495fa2ea07SAlexander Gordeev " ld 9,72(%0)\n"
2505fa2ea07SAlexander Gordeev " ld 10,80(%0)\n"
2515fa2ea07SAlexander Gordeev " ld 11,88(%0)\n"
2525fa2ea07SAlexander Gordeev " ld 12,96(%0)\n"
2535fa2ea07SAlexander Gordeev " ld 13,104(%0)\n"
2545fa2ea07SAlexander Gordeev " ld 14,112(%0)\n"
2555fa2ea07SAlexander Gordeev " ld 15,120(%0)\n"
2565fa2ea07SAlexander Gordeev :
2575fa2ea07SAlexander Gordeev : "a" (fpt_save_area)
2585fa2ea07SAlexander Gordeev : "memory");
2595fa2ea07SAlexander Gordeev } else {
2605fa2ea07SAlexander Gordeev /* Validate vector registers */
2615fa2ea07SAlexander Gordeev union ctlreg0 cr0;
2625fa2ea07SAlexander Gordeev
263f094a39cSChristian Borntraeger /*
264f094a39cSChristian Borntraeger * The vector validity must only be checked if not running a
265f094a39cSChristian Borntraeger * KVM guest. For KVM guests the machine check is forwarded by
266f094a39cSChristian Borntraeger * KVM and it is the responsibility of the guest to take
267f094a39cSChristian Borntraeger * appropriate actions. The host vector or FPU values have been
268f094a39cSChristian Borntraeger * saved by KVM and will be restored by KVM.
269f094a39cSChristian Borntraeger */
270f9e5938aSHeiko Carstens if (!mci.vr && !test_cpu_flag(CIF_MCCK_GUEST))
27180703617SMartin Schwidefsky kill_task = 1;
2725fa2ea07SAlexander Gordeev cr0.val = S390_lowcore.cregs_save_area[0];
2735fa2ea07SAlexander Gordeev cr0.afp = cr0.vx = 1;
2745fa2ea07SAlexander Gordeev __ctl_load(cr0.val, 0, 0);
2755fa2ea07SAlexander Gordeev asm volatile(
2765fa2ea07SAlexander Gordeev " la 1,%0\n"
2775720aab2SHeiko Carstens " VLM 0,15,0,1\n"
2785720aab2SHeiko Carstens " VLM 16,31,256,1\n"
2795fa2ea07SAlexander Gordeev :
2805fa2ea07SAlexander Gordeev : "Q" (*(struct vx_array *)mcesa->vector_save_area)
2815fa2ea07SAlexander Gordeev : "1");
2825fa2ea07SAlexander Gordeev __ctl_load(S390_lowcore.cregs_save_area[0], 0, 0);
28380703617SMartin Schwidefsky }
2845fa2ea07SAlexander Gordeev /* Validate access registers */
2855fa2ea07SAlexander Gordeev asm volatile(
2865fa2ea07SAlexander Gordeev " lam 0,15,0(%0)\n"
2875fa2ea07SAlexander Gordeev :
2885fa2ea07SAlexander Gordeev : "a" (&S390_lowcore.access_regs_save_area)
2895fa2ea07SAlexander Gordeev : "memory");
290f9e5938aSHeiko Carstens if (!mci.ar)
291f5daba1dSHeiko Carstens kill_task = 1;
2925fa2ea07SAlexander Gordeev /* Validate guarded storage registers */
293ad3bc0acSMartin Schwidefsky cr2.val = S390_lowcore.cregs_save_area[2];
294ad3bc0acSMartin Schwidefsky if (cr2.gse) {
2953037a52fSMartin Schwidefsky if (!mci.gs) {
296916cda1aSMartin Schwidefsky /*
2971ea1d6a8SChristian Borntraeger * 2 cases:
2981ea1d6a8SChristian Borntraeger * - machine check in kernel or userspace
2991ea1d6a8SChristian Borntraeger * - machine check while running SIE (KVM guest)
3001ea1d6a8SChristian Borntraeger * For kernel or userspace the userspace values of
3011ea1d6a8SChristian Borntraeger * guarded storage control can not be recreated, the
3021ea1d6a8SChristian Borntraeger * process must be terminated.
3031ea1d6a8SChristian Borntraeger * For SIE the guest values of guarded storage can not
3041ea1d6a8SChristian Borntraeger * be recreated. This is either due to a bug or due to
3051ea1d6a8SChristian Borntraeger * GS being disabled in the guest. The guest will be
3061ea1d6a8SChristian Borntraeger * notified by KVM code and the guests machine check
3071ea1d6a8SChristian Borntraeger * handling must take care of this. The host values
3081ea1d6a8SChristian Borntraeger * are saved by KVM and are not affected.
309916cda1aSMartin Schwidefsky */
3101ea1d6a8SChristian Borntraeger if (!test_cpu_flag(CIF_MCCK_GUEST))
311916cda1aSMartin Schwidefsky kill_task = 1;
3125fa2ea07SAlexander Gordeev } else {
3135fa2ea07SAlexander Gordeev load_gs_cb((struct gs_cb *)mcesa->guarded_storage_save_area);
314916cda1aSMartin Schwidefsky }
3153037a52fSMartin Schwidefsky }
3165fa2ea07SAlexander Gordeev /*
3175fa2ea07SAlexander Gordeev * The getcpu vdso syscall reads CPU number from the programmable
3185fa2ea07SAlexander Gordeev * field of the TOD clock. Disregard the TOD programmable register
3195fa2ea07SAlexander Gordeev * validity bit and load the CPU number into the TOD programmable
3205fa2ea07SAlexander Gordeev * field unconditionally.
3215fa2ea07SAlexander Gordeev */
3225fa2ea07SAlexander Gordeev set_tod_programmable_field(raw_smp_processor_id());
3235fa2ea07SAlexander Gordeev /* Validate clock comparator register */
3245fa2ea07SAlexander Gordeev set_clock_comparator(S390_lowcore.clock_comparator);
325f5daba1dSHeiko Carstens
326dc6e1555SHeiko Carstens if (!mci.ms || !mci.pm || !mci.ia)
327f5daba1dSHeiko Carstens kill_task = 1;
328f5daba1dSHeiko Carstens
329f5daba1dSHeiko Carstens return kill_task;
330f5daba1dSHeiko Carstens }
3315fa2ea07SAlexander Gordeev NOKPROBE_SYMBOL(s390_validate_registers);
332f5daba1dSHeiko Carstens
333da72ca4dSQingFeng Hao /*
334da72ca4dSQingFeng Hao * Backup the guest's machine check info to its description block
335da72ca4dSQingFeng Hao */
s390_backup_mcck_info(struct pt_regs * regs)336da72ca4dSQingFeng Hao static void notrace s390_backup_mcck_info(struct pt_regs *regs)
337da72ca4dSQingFeng Hao {
338da72ca4dSQingFeng Hao struct mcck_volatile_info *mcck_backup;
339da72ca4dSQingFeng Hao struct sie_page *sie_page;
340da72ca4dSQingFeng Hao
341da72ca4dSQingFeng Hao /* r14 contains the sie block, which was set in sie64a */
342ae4b60f6SNico Boehr struct kvm_s390_sie_block *sie_block = phys_to_virt(regs->gprs[14]);
343da72ca4dSQingFeng Hao
344da72ca4dSQingFeng Hao if (sie_block == NULL)
345da72ca4dSQingFeng Hao /* Something's seriously wrong, stop system. */
346da72ca4dSQingFeng Hao s390_handle_damage();
347da72ca4dSQingFeng Hao
348da72ca4dSQingFeng Hao sie_page = container_of(sie_block, struct sie_page, sie_block);
349da72ca4dSQingFeng Hao mcck_backup = &sie_page->mcck_info;
350da72ca4dSQingFeng Hao mcck_backup->mcic = S390_lowcore.mcck_interruption_code &
351da72ca4dSQingFeng Hao ~(MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE);
352da72ca4dSQingFeng Hao mcck_backup->ext_damage_code = S390_lowcore.external_damage_code;
353da72ca4dSQingFeng Hao mcck_backup->failing_storage_address
354da72ca4dSQingFeng Hao = S390_lowcore.failing_storage_address;
355da72ca4dSQingFeng Hao }
35600a8f886SMartin Schwidefsky NOKPROBE_SYMBOL(s390_backup_mcck_info);
357da72ca4dSQingFeng Hao
358f5daba1dSHeiko Carstens #define MAX_IPD_COUNT 29
359f5daba1dSHeiko Carstens #define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */
360f5daba1dSHeiko Carstens
361f5daba1dSHeiko Carstens #define ED_STP_ISLAND 6 /* External damage STP island check */
362f5daba1dSHeiko Carstens #define ED_STP_SYNC 7 /* External damage STP sync check */
363f5daba1dSHeiko Carstens
364c929500dSQingFeng Hao #define MCCK_CODE_NO_GUEST (MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE)
365c929500dSQingFeng Hao
366f5daba1dSHeiko Carstens /*
367f5daba1dSHeiko Carstens * machine check handler.
368f5daba1dSHeiko Carstens */
s390_do_machine_check(struct pt_regs * regs)369*e7ec1d2eSAlexander Gordeev void notrace s390_do_machine_check(struct pt_regs *regs)
370f5daba1dSHeiko Carstens {
371f5daba1dSHeiko Carstens static int ipd_count;
372f5daba1dSHeiko Carstens static DEFINE_SPINLOCK(ipd_lock);
373f5daba1dSHeiko Carstens static unsigned long long last_ipd;
374f5daba1dSHeiko Carstens struct mcck_struct *mcck;
375f5daba1dSHeiko Carstens unsigned long long tmp;
376520763a3SSven Schnelle irqentry_state_t irq_state;
377dc6e1555SHeiko Carstens union mci mci;
378c929500dSQingFeng Hao unsigned long mcck_dam_code;
3790b0ed657SSven Schnelle int mcck_pending = 0;
380f5daba1dSHeiko Carstens
381520763a3SSven Schnelle irq_state = irqentry_nmi_enter(regs);
38256e62a73SSven Schnelle
38356e62a73SSven Schnelle if (user_mode(regs))
38456e62a73SSven Schnelle update_timer_mcck();
385420f42ecSHeiko Carstens inc_irq_stat(NMI_NMI);
386dc6e1555SHeiko Carstens mci.val = S390_lowcore.mcck_interruption_code;
387eb7e7d76SChristoph Lameter mcck = this_cpu_ptr(&cpu_mcck);
388f5daba1dSHeiko Carstens
389c929500dSQingFeng Hao /*
390c929500dSQingFeng Hao * Reinject the instruction processing damages' machine checks
391c929500dSQingFeng Hao * including Delayed Access Exception into the guest
392c929500dSQingFeng Hao * instead of damaging the host if they happen in the guest.
393c929500dSQingFeng Hao */
394c929500dSQingFeng Hao if (mci.pd && !test_cpu_flag(CIF_MCCK_GUEST)) {
395dc6e1555SHeiko Carstens if (mci.b) {
396f5daba1dSHeiko Carstens /* Processing backup -> verify if we can survive this */
397f5daba1dSHeiko Carstens u64 z_mcic, o_mcic, t_mcic;
398f5daba1dSHeiko Carstens z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29);
399f5daba1dSHeiko Carstens o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
400f5daba1dSHeiko Carstens 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
401f5daba1dSHeiko Carstens 1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 |
402f5daba1dSHeiko Carstens 1ULL<<16);
403dc6e1555SHeiko Carstens t_mcic = mci.val;
404f5daba1dSHeiko Carstens
405f5daba1dSHeiko Carstens if (((t_mcic & z_mcic) != 0) ||
406f5daba1dSHeiko Carstens ((t_mcic & o_mcic) != o_mcic)) {
4073d68286aSHeiko Carstens s390_handle_damage();
408f5daba1dSHeiko Carstens }
409f5daba1dSHeiko Carstens
410f5daba1dSHeiko Carstens /*
411f5daba1dSHeiko Carstens * Nullifying exigent condition, therefore we might
412f5daba1dSHeiko Carstens * retry this instruction.
413f5daba1dSHeiko Carstens */
414f5daba1dSHeiko Carstens spin_lock(&ipd_lock);
4151aae0560SHeiko Carstens tmp = get_tod_clock();
416f5daba1dSHeiko Carstens if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME)
417f5daba1dSHeiko Carstens ipd_count++;
418f5daba1dSHeiko Carstens else
419f5daba1dSHeiko Carstens ipd_count = 1;
420f5daba1dSHeiko Carstens last_ipd = tmp;
421f5daba1dSHeiko Carstens if (ipd_count == MAX_IPD_COUNT)
4223d68286aSHeiko Carstens s390_handle_damage();
423f5daba1dSHeiko Carstens spin_unlock(&ipd_lock);
424f5daba1dSHeiko Carstens } else {
425f5daba1dSHeiko Carstens /* Processing damage -> stopping machine */
4263d68286aSHeiko Carstens s390_handle_damage();
427f5daba1dSHeiko Carstens }
428f5daba1dSHeiko Carstens }
429f9e5938aSHeiko Carstens if (s390_validate_registers(mci)) {
430f9e5938aSHeiko Carstens if (!user_mode(regs))
431f9e5938aSHeiko Carstens s390_handle_damage();
432f5daba1dSHeiko Carstens /*
4338f149ea6SMartin Schwidefsky * Couldn't restore all register contents for the
4348f149ea6SMartin Schwidefsky * user space process -> mark task for termination.
435f5daba1dSHeiko Carstens */
436f5daba1dSHeiko Carstens mcck->kill_task = 1;
437dc6e1555SHeiko Carstens mcck->mcck_code = mci.val;
4380b0ed657SSven Schnelle mcck_pending = 1;
439f5daba1dSHeiko Carstens }
440da72ca4dSQingFeng Hao
441da72ca4dSQingFeng Hao /*
442da72ca4dSQingFeng Hao * Backup the machine check's info if it happens when the guest
443da72ca4dSQingFeng Hao * is running.
444da72ca4dSQingFeng Hao */
445da72ca4dSQingFeng Hao if (test_cpu_flag(CIF_MCCK_GUEST))
446da72ca4dSQingFeng Hao s390_backup_mcck_info(regs);
447da72ca4dSQingFeng Hao
448dc6e1555SHeiko Carstens if (mci.cd) {
449f5daba1dSHeiko Carstens /* Timing facility damage */
4503d68286aSHeiko Carstens s390_handle_damage();
451f5daba1dSHeiko Carstens }
452dc6e1555SHeiko Carstens if (mci.ed && mci.ec) {
453f5daba1dSHeiko Carstens /* External damage */
454f5daba1dSHeiko Carstens if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC))
45529b0a825SHeiko Carstens mcck->stp_queue |= stp_sync_check();
456f5daba1dSHeiko Carstens if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND))
45729b0a825SHeiko Carstens mcck->stp_queue |= stp_island_check();
4580b0ed657SSven Schnelle mcck_pending = 1;
459f5daba1dSHeiko Carstens }
460742aed05SHeiko Carstens /*
461742aed05SHeiko Carstens * Reinject storage related machine checks into the guest if they
462742aed05SHeiko Carstens * happen when the guest is running.
463742aed05SHeiko Carstens */
464742aed05SHeiko Carstens if (!test_cpu_flag(CIF_MCCK_GUEST)) {
465742aed05SHeiko Carstens /* Storage error uncorrected */
466742aed05SHeiko Carstens if (mci.se)
467742aed05SHeiko Carstens s390_handle_damage();
468742aed05SHeiko Carstens /* Storage key-error uncorrected */
469742aed05SHeiko Carstens if (mci.ke)
470742aed05SHeiko Carstens s390_handle_damage();
471742aed05SHeiko Carstens /* Storage degradation */
472742aed05SHeiko Carstens if (mci.ds && mci.fa)
473742aed05SHeiko Carstens s390_handle_damage();
474742aed05SHeiko Carstens }
475dc6e1555SHeiko Carstens if (mci.cp) {
476f5daba1dSHeiko Carstens /* Channel report word pending */
477f5daba1dSHeiko Carstens mcck->channel_report = 1;
4780b0ed657SSven Schnelle mcck_pending = 1;
479f5daba1dSHeiko Carstens }
480dc6e1555SHeiko Carstens if (mci.w) {
481f5daba1dSHeiko Carstens /* Warning pending */
482f5daba1dSHeiko Carstens mcck->warning = 1;
4830b0ed657SSven Schnelle mcck_pending = 1;
484f5daba1dSHeiko Carstens }
485c929500dSQingFeng Hao
486c929500dSQingFeng Hao /*
487c929500dSQingFeng Hao * If there are only Channel Report Pending and External Damage
488c929500dSQingFeng Hao * machine checks, they will not be reinjected into the guest
489c929500dSQingFeng Hao * because they refer to host conditions only.
490c929500dSQingFeng Hao */
491c929500dSQingFeng Hao mcck_dam_code = (mci.val & MCIC_SUBCLASS_MASK);
492c929500dSQingFeng Hao if (test_cpu_flag(CIF_MCCK_GUEST) &&
493c929500dSQingFeng Hao (mcck_dam_code & MCCK_CODE_NO_GUEST) != mcck_dam_code) {
494c929500dSQingFeng Hao /* Set exit reason code for host's later handling */
495c929500dSQingFeng Hao *((long *)(regs->gprs[15] + __SF_SIE_REASON)) = -EINTR;
496c929500dSQingFeng Hao }
497c929500dSQingFeng Hao clear_cpu_flag(CIF_MCCK_GUEST);
4980b0ed657SSven Schnelle
4990b0ed657SSven Schnelle if (mcck_pending)
5000b0ed657SSven Schnelle schedule_mcck_handler();
5010b0ed657SSven Schnelle
502520763a3SSven Schnelle irqentry_nmi_exit(regs, irq_state);
503f5daba1dSHeiko Carstens }
50400a8f886SMartin Schwidefsky NOKPROBE_SYMBOL(s390_do_machine_check);
505f5daba1dSHeiko Carstens
machine_check_init(void)506f5daba1dSHeiko Carstens static int __init machine_check_init(void)
507f5daba1dSHeiko Carstens {
508f5daba1dSHeiko Carstens ctl_set_bit(14, 25); /* enable external damage MCH */
509f5daba1dSHeiko Carstens ctl_set_bit(14, 27); /* enable system recovery MCH */
510f5daba1dSHeiko Carstens ctl_set_bit(14, 24); /* enable warning MCH */
511f5daba1dSHeiko Carstens return 0;
512f5daba1dSHeiko Carstens }
51324d05ff8SHeiko Carstens early_initcall(machine_check_init);
514