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)  * machine_kexec.c - handle transition of Linux booting another kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * LANDISK/sh4 supported by kogiidena
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/numa.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/sh_bios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 				      unsigned long reboot_code_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 				      unsigned long start_address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) extern const unsigned char relocate_new_kernel[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) extern const unsigned int relocate_new_kernel_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) extern void *vbr_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) void native_machine_crash_shutdown(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	/* Nothing to do for UP, but definitely broken for SMP.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * Do what every setup is needed on image and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * reboot code buffer to allow us to avoid allocations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) int machine_kexec_prepare(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) void machine_kexec_cleanup(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static void kexec_info(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)         int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	printk("kexec information\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	for (i = 0; i < image->nr_segments; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	        printk("  segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		       i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		       (unsigned int)image->segment[i].mem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		       (unsigned int)image->segment[i].mem +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 				     image->segment[i].memsz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		       (unsigned int)image->segment[i].memsz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	printk("  start     : 0x%08x\n\n", (unsigned int)image->start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * Do not allocate memory (or fail in any way) in machine_kexec().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  * We are past the point of no return, committed to rebooting now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) void machine_kexec(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	unsigned long page_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	unsigned long reboot_code_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	relocate_new_kernel_t rnk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	unsigned long entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	unsigned long *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	int save_ftrace_enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	 * Nicked from the mips version of machine_kexec():
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	 * The generic kexec code builds a page list with physical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	 * addresses. Use phys_to_virt() to convert them to virtual.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	     ptr = (entry & IND_INDIRECTION) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	       phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		    *ptr & IND_DESTINATION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			*ptr = (unsigned long) phys_to_virt(*ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) #ifdef CONFIG_KEXEC_JUMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (image->preserve_context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		save_processor_state();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	save_ftrace_enabled = __ftrace_enabled_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	/* Interrupts aren't acceptable while we reboot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	page_list = image->head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	/* we need both effective and real address here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	reboot_code_buffer =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			(unsigned long)page_address(image->control_code_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	/* copy our kernel relocation code to the control code page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	memcpy((void *)reboot_code_buffer, relocate_new_kernel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 						relocate_new_kernel_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	kexec_info(image);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	flush_cache_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	sh_bios_vbr_reload();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	/* now call it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	rnk = (relocate_new_kernel_t) reboot_code_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	(*rnk)(page_list, reboot_code_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	       (unsigned long)phys_to_virt(image->start));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #ifdef CONFIG_KEXEC_JUMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (image->preserve_context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		restore_processor_state();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	/* Convert page list back to physical addresses, what a mess. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	     ptr = (*ptr & IND_INDIRECTION) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	       phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		    *ptr & IND_DESTINATION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			*ptr = virt_to_phys(*ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	__ftrace_enabled_restore(save_ftrace_enabled);
^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) void arch_crash_save_vmcoreinfo(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) #ifdef CONFIG_NUMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	VMCOREINFO_SYMBOL(node_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #ifdef CONFIG_X2TLB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	VMCOREINFO_CONFIG(X2TLB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) void __init reserve_crashkernel(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	unsigned long long crash_size, crash_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			&crash_size, &crash_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (ret == 0 && crash_size > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		crashk_res.start = crash_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		crashk_res.end = crash_base + crash_size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (crashk_res.end == crashk_res.start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		goto disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	crash_size = PAGE_ALIGN(resource_size(&crashk_res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (!crashk_res.start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		unsigned long max = memblock_end_of_DRAM() - memory_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		crashk_res.start = memblock_phys_alloc_range(crash_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 							     PAGE_SIZE, 0, max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		if (!crashk_res.start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			pr_err("crashkernel allocation failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			goto disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		ret = memblock_reserve(crashk_res.start, crash_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		if (unlikely(ret < 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			pr_err("crashkernel reservation failed - "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			       "memory is in use\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			goto disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		}
^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) 	crashk_res.end = crashk_res.start + crash_size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	 * Crash kernel trumps memory limit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		memory_limit = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		pr_info("Disabled memory limit for crashkernel\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	pr_info("Reserving %ldMB of memory at 0x%08lx "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		"for crashkernel (System RAM: %ldMB)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		(unsigned long)(crash_size >> 20),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		(unsigned long)(crashk_res.start),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		(unsigned long)(memblock_phys_mem_size() >> 20));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) disable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	crashk_res.start = crashk_res.end = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }