Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * kexec for arm64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) Linaro.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) Huawei Futurewei Technologies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.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/page-flags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/cpu_ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/daifflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/mmu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include "cpu-reset.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /* Global variables for the arm64_relocate_new_kernel routine. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) extern const unsigned char arm64_relocate_new_kernel[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) extern const unsigned long arm64_relocate_new_kernel_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * kexec_image_info - For debugging output.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define kexec_image_info(_i) _kexec_image_info(__func__, __LINE__, _i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static void _kexec_image_info(const char *func, int line,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	const struct kimage *kimage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	unsigned long i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	pr_debug("%s:%d:\n", func, line);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	pr_debug("  kexec kimage info:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	pr_debug("    type:        %d\n", kimage->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	pr_debug("    start:       %lx\n", kimage->start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	pr_debug("    head:        %lx\n", kimage->head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	pr_debug("    nr_segments: %lu\n", kimage->nr_segments);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	for (i = 0; i < kimage->nr_segments; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		pr_debug("      segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 			i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			kimage->segment[i].mem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			kimage->segment[i].mem + kimage->segment[i].memsz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 			kimage->segment[i].memsz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			kimage->segment[i].memsz /  PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) void machine_kexec_cleanup(struct kimage *kimage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	/* Empty routine needed to avoid build errors. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * machine_kexec_prepare - Prepare for a kexec reboot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  * Called from the core kexec code when a kernel image is loaded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * Forbid loading a kexec kernel if we have no way of hotplugging cpus or cpus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * are stuck in the kernel. This avoids a panic once we hit machine_kexec().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) int machine_kexec_prepare(struct kimage *kimage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	kexec_image_info(kimage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (kimage->type != KEXEC_TYPE_CRASH && cpus_are_stuck_in_kernel()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		pr_err("Can't kexec: CPUs are stuck in the kernel.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * kexec_list_flush - Helper to flush the kimage list and source pages to PoC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static void kexec_list_flush(struct kimage *kimage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	kimage_entry_t *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	for (entry = &kimage->head; ; entry++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		unsigned int flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		void *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		/* flush the list entries. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		__flush_dcache_area(entry, sizeof(kimage_entry_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		flag = *entry & IND_FLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		if (flag == IND_DONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		addr = phys_to_virt(*entry & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		switch (flag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		case IND_INDIRECTION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			/* Set entry point just before the new list page. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			entry = (kimage_entry_t *)addr - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		case IND_SOURCE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			/* flush the source pages. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			__flush_dcache_area(addr, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		case IND_DESTINATION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)  * kexec_segment_flush - Helper to flush the kimage segments to PoC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static void kexec_segment_flush(const struct kimage *kimage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	unsigned long i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	pr_debug("%s:\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	for (i = 0; i < kimage->nr_segments; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		pr_debug("  segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			kimage->segment[i].mem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			kimage->segment[i].mem + kimage->segment[i].memsz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			kimage->segment[i].memsz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			kimage->segment[i].memsz /  PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		__flush_dcache_area(phys_to_virt(kimage->segment[i].mem),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			kimage->segment[i].memsz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * machine_kexec - Do the kexec reboot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * Called from the core kexec code for a sys_reboot with LINUX_REBOOT_CMD_KEXEC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) void machine_kexec(struct kimage *kimage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	phys_addr_t reboot_code_buffer_phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	void *reboot_code_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	bool in_kexec_crash = (kimage == kexec_crash_image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	bool stuck_cpus = cpus_are_stuck_in_kernel();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	 * New cpus may have become stuck_in_kernel after we loaded the image.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	BUG_ON(!in_kexec_crash && (stuck_cpus || (num_online_cpus() > 1)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	WARN(in_kexec_crash && (stuck_cpus || smp_crash_stop_failed()),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		"Some CPUs may be stale, kdump will be unreliable.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	reboot_code_buffer_phys = page_to_phys(kimage->control_code_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	reboot_code_buffer = phys_to_virt(reboot_code_buffer_phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	kexec_image_info(kimage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	 * Copy arm64_relocate_new_kernel to the reboot_code_buffer for use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	 * after the kernel is shut down.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	memcpy(reboot_code_buffer, arm64_relocate_new_kernel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		arm64_relocate_new_kernel_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	/* Flush the reboot_code_buffer in preparation for its execution. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	__flush_dcache_area(reboot_code_buffer, arm64_relocate_new_kernel_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	 * Although we've killed off the secondary CPUs, we don't update
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	 * the online mask if we're handling a crash kernel and consequently
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	 * need to avoid flush_icache_range(), which will attempt to IPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	 * the offline CPUs. Therefore, we must use the __* variant here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	__flush_icache_range((uintptr_t)reboot_code_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			     (uintptr_t)reboot_code_buffer +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			     arm64_relocate_new_kernel_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	/* Flush the kimage list and its buffers. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	kexec_list_flush(kimage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	/* Flush the new image if already in place. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if ((kimage != kexec_crash_image) && (kimage->head & IND_DONE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		kexec_segment_flush(kimage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	pr_info("Bye!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	local_daif_mask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	 * cpu_soft_restart will shutdown the MMU, disable data caches, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	 * transfer control to the reboot_code_buffer which contains a copy of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	 * the arm64_relocate_new_kernel routine.  arm64_relocate_new_kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	 * uses physical addressing to relocate the new image to its final
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	 * position and transfers control to the image entry point when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	 * relocation is complete.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	 * In kexec case, kimage->start points to purgatory assuming that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	 * kernel entry and dtb address are embedded in purgatory by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	 * userspace (kexec-tools).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	 * In kexec_file case, the kernel starts directly without purgatory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	cpu_soft_restart(reboot_code_buffer_phys, kimage->head, kimage->start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) #ifdef CONFIG_KEXEC_FILE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 						kimage->arch.dtb_mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 						0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	BUG(); /* Should never get here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static void machine_kexec_mask_interrupts(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	for_each_irq_desc(i, desc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		struct irq_chip *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		chip = irq_desc_get_chip(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		 * First try to remove the active state. If this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		 * fails, try to EOI the interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		if (ret && irqd_irq_inprogress(&desc->irq_data) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		    chip->irq_eoi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			chip->irq_eoi(&desc->irq_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		if (chip->irq_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			chip->irq_mask(&desc->irq_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			chip->irq_disable(&desc->irq_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  * machine_crash_shutdown - shutdown non-crashing cpus and save registers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) void machine_crash_shutdown(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	/* shutdown non-crashing cpus */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	crash_smp_send_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	/* for crashing cpu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	crash_save_cpu(regs, smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	machine_kexec_mask_interrupts();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	pr_info("Starting crashdump kernel...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) void arch_kexec_protect_crashkres(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	kexec_segment_flush(kexec_crash_image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	for (i = 0; i < kexec_crash_image->nr_segments; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		set_memory_valid(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			__phys_to_virt(kexec_crash_image->segment[i].mem),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 			kexec_crash_image->segment[i].memsz >> PAGE_SHIFT, 0);
^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) void arch_kexec_unprotect_crashkres(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	for (i = 0; i < kexec_crash_image->nr_segments; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		set_memory_valid(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			__phys_to_virt(kexec_crash_image->segment[i].mem),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			kexec_crash_image->segment[i].memsz >> PAGE_SHIFT, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) #ifdef CONFIG_HIBERNATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)  * To preserve the crash dump kernel image, the relevant memory segments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)  * should be mapped again around the hibernation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) void crash_prepare_suspend(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (kexec_crash_image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		arch_kexec_unprotect_crashkres();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) void crash_post_resume(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (kexec_crash_image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		arch_kexec_protect_crashkres();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)  * crash_is_nosave
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)  * Return true only if a page is part of reserved memory for crash dump kernel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)  * but does not hold any data of loaded kernel image.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)  * Note that all the pages in crash dump kernel memory have been initially
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)  * marked as Reserved as memory was allocated via memblock_reserve().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)  * In hibernation, the pages which are Reserved and yet "nosave" are excluded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)  * from the hibernation iamge. crash_is_nosave() does thich check for crash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)  * dump kernel and will reduce the total size of hibernation image.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) bool crash_is_nosave(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	phys_addr_t addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (!crashk_res.end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/* in reserved memory? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	addr = __pfn_to_phys(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	if ((addr < crashk_res.start) || (crashk_res.end < addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	if (!kexec_crash_image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	/* not part of loaded kernel image? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	for (i = 0; i < kexec_crash_image->nr_segments; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		if (addr >= kexec_crash_image->segment[i].mem &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 				addr < (kexec_crash_image->segment[i].mem +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 					kexec_crash_image->segment[i].memsz))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	for (addr = begin; addr < end; addr += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		page = phys_to_page(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		free_reserved_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) #endif /* CONFIG_HIBERNATION */