Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright IBM Corp. 2005, 2011
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Author(s): Rolf Adelsberger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *	      Heiko Carstens <heiko.carstens@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *	      Michael Holzheu <holzheu@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/debug_locks.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/cio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/ipl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/diag.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/asm-offsets.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/os_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <asm/set_memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <asm/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <asm/nmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) extern const unsigned char relocate_kernel[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) extern const unsigned long long relocate_kernel_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #ifdef CONFIG_CRASH_DUMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * Reset the system, copy boot CPU registers to absolute zero,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * and jump to the kdump image
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static void __do_machine_kdump(void *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	int (*start_kdump)(int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	unsigned long prefix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	/* store_status() saved the prefix register to lowcore */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	prefix = (unsigned long) S390_lowcore.prefixreg_save_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	/* Now do the reset  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	s390_reset_system();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	 * Copy dump CPU store status info to absolute zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	 * This need to be done *after* s390_reset_system set the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	 * prefix register of this CPU to zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	memcpy((void *) __LC_FPREGS_SAVE_AREA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	       (void *)(prefix + __LC_FPREGS_SAVE_AREA), 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	__load_psw_mask(PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	start_kdump = (void *)((struct kimage *) image)->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	start_kdump(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	/* Die if start_kdump returns */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	disabled_wait();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70)  * Start kdump: create a LGR log entry, store status of all CPUs and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71)  * branch to __do_machine_kdump.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) static noinline void __machine_kdump(void *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct mcesa *mcesa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	union ctlreg2 cr2_old, cr2_new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	int this_cpu, cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	lgr_info_log();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	/* Get status of the other CPUs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	this_cpu = smp_find_processor_id(stap());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	for_each_online_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		if (cpu == this_cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		if (smp_store_status(cpu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	/* Store status of the boot CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	mcesa = (struct mcesa *)(S390_lowcore.mcesad & MCESA_ORIGIN_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (MACHINE_HAS_VX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		save_vx_regs((__vector128 *) mcesa->vector_save_area);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (MACHINE_HAS_GS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		__ctl_store(cr2_old.val, 2, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		cr2_new = cr2_old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		cr2_new.gse = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		__ctl_load(cr2_new.val, 2, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		save_gs_cb((struct gs_cb *) mcesa->guarded_storage_save_area);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		__ctl_load(cr2_old.val, 2, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	 * To create a good backchain for this CPU in the dump store_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	 * is passed the address of a function. The address is saved into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	 * the PSW save area of the boot CPU and the function is invoked as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	 * a tail call of store_status. The backchain in the dump will look
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	 * like this:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	 *   restart_int_handler ->  __machine_kexec -> __do_machine_kdump
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 * The call to store_status() will not return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	store_status(__do_machine_kdump, image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static unsigned long do_start_kdump(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct kimage *image = (struct kimage *) addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	int (*start_kdump)(int) = (void *)image->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	__arch_local_irq_stnsm(0xfb); /* disable DAT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	rc = start_kdump(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	__arch_local_irq_stosm(0x04); /* enable DAT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) #endif /* CONFIG_CRASH_DUMP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  * Check if kdump checksums are valid: We call purgatory with parameter "0"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static bool kdump_csum_valid(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #ifdef CONFIG_CRASH_DUMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	rc = CALL_ON_STACK(do_start_kdump, S390_lowcore.nodat_stack, 1, image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	return rc == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #ifdef CONFIG_CRASH_DUMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	unsigned long addr, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	for (addr = begin; addr < end; addr += PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	size = begin - crashk_res.start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		os_info_crashkernel_add(crashk_res.start, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		os_info_crashkernel_add(0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static void crash_protect_pages(int protect)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (!crashk_res.end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	size = resource_size(&crashk_res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if (protect)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		set_memory_ro(crashk_res.start, size >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		set_memory_rw(crashk_res.start, size >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) void arch_kexec_protect_crashkres(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	crash_protect_pages(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) void arch_kexec_unprotect_crashkres(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	crash_protect_pages(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * Give back memory to hypervisor before new kdump is loaded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static int machine_kexec_prepare_kdump(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) #ifdef CONFIG_CRASH_DUMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (MACHINE_IS_VM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		diag10_range(PFN_DOWN(crashk_res.start),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			     PFN_DOWN(crashk_res.end - crashk_res.start + 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int machine_kexec_prepare(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	void *reboot_code_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	if (image->type == KEXEC_TYPE_CRASH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		return machine_kexec_prepare_kdump();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	/* We don't support anything but the default image type for now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (image->type != KEXEC_TYPE_DEFAULT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	/* Get the destination where the assembler code should be copied to.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	/* Then copy it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) void machine_kexec_cleanup(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) void arch_crash_save_vmcoreinfo(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	VMCOREINFO_SYMBOL(lowcore_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	VMCOREINFO_SYMBOL(high_memory);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	vmcoreinfo_append_str("SDMA=%lx\n", __sdma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	vmcoreinfo_append_str("EDMA=%lx\n", __edma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) void machine_shutdown(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) void machine_crash_shutdown(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	set_os_info_reipl_block();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  * Do normal kexec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static void __do_machine_kexec(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	relocate_kernel_t data_mover;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	struct kimage *image = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	s390_reset_system();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	__arch_local_irq_stnsm(0xfb); /* disable DAT - avoid no-execute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	/* Call the moving routine */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	(*data_mover)(&image->head, image->start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	/* Die if kexec returns */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	disabled_wait();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)  * Reset system and call either kdump or normal kexec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) static void __machine_kexec(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	__arch_local_irq_stosm(0x04); /* enable DAT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	pfault_fini();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	tracing_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	debug_locks_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) #ifdef CONFIG_CRASH_DUMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (((struct kimage *) data)->type == KEXEC_TYPE_CRASH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		__machine_kdump(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	__do_machine_kexec(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  * Do either kdump or normal kexec. In case of kdump we first ask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)  * purgatory, if kdump checksums are valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) void machine_kexec(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	tracer_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	smp_send_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	smp_call_ipl_cpu(__machine_kexec, image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }