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0b0ed657fe
The current code is rather complex and caused a lot of subtle and hard to debug bugs in the past. Simplify the code by calling the system_call handler with interrupts disabled, save machine state, and re-enable them later. This requires significant changes to the machine check handling code as well. When the machine check interrupt arrived while being in kernel mode the new code will signal pending machine checks with a SIGP external call. When userspace was interrupted, the handler will switch to the kernel stack and directly execute s390_handle_mcck(). Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Machine check handler definitions
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*
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* Copyright IBM Corp. 2000, 2009
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* Author(s): Ingo Adlung <adlung@de.ibm.com>,
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* Martin Schwidefsky <schwidefsky@de.ibm.com>,
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* Cornelia Huck <cornelia.huck@de.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>,
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*/
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#ifndef _ASM_S390_NMI_H
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#define _ASM_S390_NMI_H
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#include <linux/bits.h>
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#include <linux/types.h>
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#define MCIC_SUBCLASS_MASK (1ULL<<63 | 1ULL<<62 | 1ULL<<61 | \
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1ULL<<59 | 1ULL<<58 | 1ULL<<56 | \
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1ULL<<55 | 1ULL<<54 | 1ULL<<53 | \
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1ULL<<52 | 1ULL<<47 | 1ULL<<46 | \
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1ULL<<45 | 1ULL<<44)
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#define MCCK_CODE_SYSTEM_DAMAGE BIT(63)
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#define MCCK_CODE_EXT_DAMAGE BIT(63 - 5)
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#define MCCK_CODE_CP BIT(63 - 9)
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#define MCCK_CODE_CPU_TIMER_VALID BIT(63 - 46)
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#define MCCK_CODE_PSW_MWP_VALID BIT(63 - 20)
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#define MCCK_CODE_PSW_IA_VALID BIT(63 - 23)
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#define MCCK_CODE_CR_VALID BIT(63 - 29)
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#define MCCK_CODE_GS_VALID BIT(63 - 36)
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#define MCCK_CODE_FC_VALID BIT(63 - 43)
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#ifndef __ASSEMBLY__
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union mci {
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unsigned long val;
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struct {
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u64 sd : 1; /* 00 system damage */
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u64 pd : 1; /* 01 instruction-processing damage */
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u64 sr : 1; /* 02 system recovery */
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u64 : 1; /* 03 */
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u64 cd : 1; /* 04 timing-facility damage */
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u64 ed : 1; /* 05 external damage */
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u64 : 1; /* 06 */
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u64 dg : 1; /* 07 degradation */
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u64 w : 1; /* 08 warning pending */
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u64 cp : 1; /* 09 channel-report pending */
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u64 sp : 1; /* 10 service-processor damage */
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u64 ck : 1; /* 11 channel-subsystem damage */
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u64 : 2; /* 12-13 */
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u64 b : 1; /* 14 backed up */
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u64 : 1; /* 15 */
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u64 se : 1; /* 16 storage error uncorrected */
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u64 sc : 1; /* 17 storage error corrected */
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u64 ke : 1; /* 18 storage-key error uncorrected */
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u64 ds : 1; /* 19 storage degradation */
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u64 wp : 1; /* 20 psw mwp validity */
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u64 ms : 1; /* 21 psw mask and key validity */
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u64 pm : 1; /* 22 psw program mask and cc validity */
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u64 ia : 1; /* 23 psw instruction address validity */
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u64 fa : 1; /* 24 failing storage address validity */
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u64 vr : 1; /* 25 vector register validity */
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u64 ec : 1; /* 26 external damage code validity */
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u64 fp : 1; /* 27 floating point register validity */
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u64 gr : 1; /* 28 general register validity */
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u64 cr : 1; /* 29 control register validity */
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u64 : 1; /* 30 */
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u64 st : 1; /* 31 storage logical validity */
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u64 ie : 1; /* 32 indirect storage error */
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u64 ar : 1; /* 33 access register validity */
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u64 da : 1; /* 34 delayed access exception */
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u64 : 1; /* 35 */
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u64 gs : 1; /* 36 guarded storage registers validity */
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u64 : 5; /* 37-41 */
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u64 pr : 1; /* 42 tod programmable register validity */
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u64 fc : 1; /* 43 fp control register validity */
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u64 ap : 1; /* 44 ancillary report */
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u64 : 1; /* 45 */
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u64 ct : 1; /* 46 cpu timer validity */
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u64 cc : 1; /* 47 clock comparator validity */
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u64 : 16; /* 47-63 */
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};
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};
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#define MCESA_ORIGIN_MASK (~0x3ffUL)
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#define MCESA_LC_MASK (0xfUL)
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#define MCESA_MIN_SIZE (1024)
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#define MCESA_MAX_SIZE (2048)
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struct mcesa {
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u8 vector_save_area[1024];
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u8 guarded_storage_save_area[32];
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};
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struct pt_regs;
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void nmi_alloc_boot_cpu(struct lowcore *lc);
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int nmi_alloc_per_cpu(struct lowcore *lc);
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void nmi_free_per_cpu(struct lowcore *lc);
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void s390_handle_mcck(void);
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int s390_do_machine_check(struct pt_regs *regs);
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_S390_NMI_H */
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