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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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[PATCH] s390: kexec fixes and improvements.
Disable pseudo page fault handling before starting the new kernel and try to use diag308 to reset the machine. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heiko Carstens
Linus Torvalds
parent
4374ae10e5
commit
5d3f229fcd
@ -70,6 +70,8 @@ machine_kexec(struct kimage *image)
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for (;;);
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}
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extern void pfault_fini(void);
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static void
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kexec_halt_all_cpus(void *kernel_image)
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{
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@ -78,6 +80,11 @@ kexec_halt_all_cpus(void *kernel_image)
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struct kimage *image;
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relocate_kernel_t data_mover;
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#ifdef CONFIG_PFAULT
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if (MACHINE_IS_VM)
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pfault_fini();
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#endif
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if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
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signal_processor(smp_processor_id(), sigp_stop);
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@ -4,6 +4,7 @@
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*
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*/
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@ -25,8 +26,31 @@
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relocate_kernel:
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basr %r13,0 #base address
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.base:
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spx zero64-.base(%r13) #absolute addressing mode
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stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external)
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spx zero64-.base(%r13) #absolute addressing mode
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stctl %c0,%c15,ctlregs-.base(%r13)
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stm %r0,%r15,gprregs-.base(%r13)
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la %r1,load_psw-.base(%r13)
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mvc 0(8,%r0),0(%r1)
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la %r0,.back-.base(%r13)
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st %r0,4(%r0)
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oi 4(%r0),0x80
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mvc 0x68(8,%r0),0(%r1)
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la %r0,.back_pgm-.base(%r13)
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st %r0,0x6c(%r0)
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oi 0x6c(%r0),0x80
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lhi %r0,0
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diag %r0,%r0,0x308
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.back:
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basr %r13,0
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.back_base:
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oi have_diag308-.back_base(%r13),0x01
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lctl %c0,%c15,ctlregs-.back_base(%r13)
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lm %r0,%r15,gprregs-.back_base(%r13)
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j .start_reloc
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.back_pgm:
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lm %r0,%r15,gprregs-.base(%r13)
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.start_reloc:
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lhi %r10,-1 #preparing the mask
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sll %r10,12 #shift it such that it becomes 0xf000
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.top:
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@ -63,6 +87,10 @@
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o %r3,4(%r4) #or load address into psw
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st %r3,4(%r4)
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mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0
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tm have_diag308-.base(%r13),0x01
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jno .no_diag308
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diag %r0,%r0,0x308
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.no_diag308:
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sr %r1,%r1 #clear %r1
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sr %r2,%r2 #clear %r2
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sigp %r1,%r2,0x12 #set cpuid to zero
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@ -75,6 +103,17 @@
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.long 0x00080000,0x80000000
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sys_msk:
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.quad 0
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ctlregs:
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.rept 16
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.long 0
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.endr
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gprregs:
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.rept 16
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.long 0
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.endr
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have_diag308:
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.byte 0
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.align 8
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relocate_kernel_end:
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.globl relocate_kernel_len
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relocate_kernel_len:
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@ -4,6 +4,7 @@
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*
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*/
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@ -26,8 +27,34 @@
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relocate_kernel:
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basr %r13,0 #base address
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.base:
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stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQs
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spx zero64-.base(%r13) #absolute addressing mode
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stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external)
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stctg %c0,%c15,ctlregs-.base(%r13)
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stmg %r0,%r15,gprregs-.base(%r13)
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lghi %r0,3
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sllg %r0,%r0,31
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stg %r0,0x1d0(%r0)
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la %r0,.back_pgm-.base(%r13)
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stg %r0,0x1d8(%r0)
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la %r1,load_psw-.base(%r13)
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mvc 0(8,%r0),0(%r1)
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la %r0,.back-.base(%r13)
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st %r0,4(%r0)
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oi 4(%r0),0x80
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lghi %r0,0
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diag %r0,%r0,0x308
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.back:
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lhi %r1,1 #mode 1 = esame
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sigp %r1,%r0,0x12 #switch to esame mode
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sam64 #switch to 64 bit addressing mode
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basr %r13,0
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.back_base:
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oi have_diag308-.back_base(%r13),0x01
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lctlg %c0,%c15,ctlregs-.back_base(%r13)
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lmg %r0,%r15,gprregs-.back_base(%r13)
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j .top
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.back_pgm:
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lmg %r0,%r15,gprregs-.base(%r13)
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.top:
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lghi %r7,4096 #load PAGE_SIZE in r7
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lghi %r9,4096 #load PAGE_SIZE in r9
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@ -62,6 +89,10 @@
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o %r3,4(%r4) #or load address into psw
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st %r3,4(%r4)
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mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0
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tm have_diag308-.base(%r13),0x01
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jno .no_diag308
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diag %r0,%r0,0x308
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.no_diag308:
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sam31 #31 bit mode
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sr %r1,%r1 #erase register r1
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sr %r2,%r2 #erase register r2
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@ -75,8 +106,18 @@
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.long 0x00080000,0x80000000
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sys_msk:
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.quad 0
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ctlregs:
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.rept 16
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.quad 0
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.endr
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gprregs:
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.rept 16
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.quad 0
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.endr
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have_diag308:
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.byte 0
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.align 8
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relocate_kernel_end:
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.globl relocate_kernel_len
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relocate_kernel_len:
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.quad relocate_kernel_end - relocate_kernel
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@ -537,7 +537,8 @@ int __devinit start_secondary(void *cpuvoid)
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#endif
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#ifdef CONFIG_PFAULT
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/* Enable pfault pseudo page faults on this cpu. */
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pfault_init();
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if (MACHINE_IS_VM)
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pfault_init();
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#endif
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/* Mark this cpu as online */
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cpu_set(smp_processor_id(), cpu_online_map);
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@ -690,7 +691,8 @@ __cpu_disable(void)
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#ifdef CONFIG_PFAULT
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/* Disable pfault pseudo page faults on this cpu. */
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pfault_fini();
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if (MACHINE_IS_VM)
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pfault_fini();
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#endif
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/* disable all external interrupts */
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@ -29,6 +29,7 @@
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/reboot.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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@ -675,6 +676,19 @@ asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
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panic("Corrupt kernel stack, can't continue.");
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}
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#ifndef CONFIG_ARCH_S390X
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static int
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pagex_reboot_event(struct notifier_block *this, unsigned long event, void *ptr)
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{
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if (MACHINE_IS_VM)
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cpcmd("SET PAGEX OFF", NULL, 0, NULL);
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return NOTIFY_DONE;
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}
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static struct notifier_block pagex_reboot_notifier = {
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.notifier_call = &pagex_reboot_event,
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};
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#endif
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/* init is done in lowcore.S and head.S */
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@ -735,6 +749,7 @@ void __init trap_init(void)
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&ext_int_pfault);
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#endif
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#ifndef CONFIG_ARCH_S390X
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register_reboot_notifier(&pagex_reboot_notifier);
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cpcmd("SET PAGEX ON", NULL, 0, NULL);
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#endif
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}
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