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)  * Architecture specific (i386/x86_64) functions for kexec based crash dumps.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) IBM Corporation, 2004. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Copyright (C) Red Hat Inc., 2014. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *      Vivek Goyal <vgoyal@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #define pr_fmt(fmt)	"kexec: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/elfcore.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <asm/hardirq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <asm/nmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <asm/hw_irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <asm/apic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <asm/e820/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <asm/io_apic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <asm/hpet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include <linux/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #include <asm/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #include <asm/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #include <asm/virtext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #include <asm/intel_pt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #include <asm/crash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #include <asm/cmdline.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) /* Used while preparing memory map entries for second kernel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) struct crash_memmap_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct boot_params *params;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	/* Type of memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	unsigned int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * This is used to VMCLEAR all VMCSs loaded on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * processor. And when loading kvm_intel module, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  * callback function pointer will be assigned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  * protected by rcu.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) EXPORT_SYMBOL_GPL(crash_vmclear_loaded_vmcss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static inline void cpu_crash_vmclear_loaded_vmcss(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	crash_vmclear_fn *do_vmclear_operation = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	do_vmclear_operation = rcu_dereference(crash_vmclear_loaded_vmcss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (do_vmclear_operation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		do_vmclear_operation();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * When the crashkernel option is specified, only use the low
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  * 1M for the real mode trampoline.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) void __init crash_reserve_low_1M(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (cmdline_find_option(boot_command_line, "crashkernel", NULL, 0) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	memblock_reserve(0, 1<<20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	pr_info("Reserving the low 1M of memory for crashkernel\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static void kdump_nmi_callback(int cpu, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	crash_save_cpu(regs, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 * VMCLEAR VMCSs loaded on all cpus if needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	cpu_crash_vmclear_loaded_vmcss();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	/* Disable VMX or SVM if needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	 * We need to disable virtualization on all CPUs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	 * Having VMX or SVM enabled on any CPU may break rebooting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	 * after the kdump kernel has finished its task.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	cpu_emergency_vmxoff();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	cpu_emergency_svm_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 * Disable Intel PT to stop its logging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	cpu_emergency_stop_pt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	disable_local_APIC();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) void kdump_nmi_shootdown_cpus(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	nmi_shootdown_cpus(kdump_nmi_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	disable_local_APIC();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* Override the weak function in kernel/panic.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) void crash_smp_send_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	static int cpus_stopped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (cpus_stopped)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (smp_ops.crash_stop_other_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		smp_ops.crash_stop_other_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		smp_send_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	cpus_stopped = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) void crash_smp_send_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	/* There are no cpus to shootdown */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) void native_machine_crash_shutdown(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	/* This function is only called after the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	 * has panicked or is otherwise in a critical state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	 * The minimum amount of code to allow a kexec'd kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	 * to run successfully needs to happen here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	 * In practice this means shooting down the other cpus in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	 * an SMP system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	/* The kernel is broken so disable interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	crash_smp_send_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	 * VMCLEAR VMCSs loaded on this cpu if needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	cpu_crash_vmclear_loaded_vmcss();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	/* Booting kdump kernel with VMX or SVM enabled won't work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	 * because (among other limitations) we can't disable paging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	 * with the virt flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	cpu_emergency_vmxoff();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	cpu_emergency_svm_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	 * Disable Intel PT to stop its logging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	cpu_emergency_stop_pt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) #ifdef CONFIG_X86_IO_APIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	/* Prevent crash_kexec() from deadlocking on ioapic_lock. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	ioapic_zap_locks();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	clear_IO_APIC();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	lapic_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	restore_boot_irq_mode();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) #ifdef CONFIG_HPET_TIMER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	hpet_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	crash_save_cpu(regs, safe_smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) #ifdef CONFIG_KEXEC_FILE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static int get_nr_ram_ranges_callback(struct resource *res, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	unsigned int *nr_ranges = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	(*nr_ranges)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) /* Gather all the required information to prepare elf headers for ram regions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static struct crash_mem *fill_up_crash_elf_data(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	unsigned int nr_ranges = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	struct crash_mem *cmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	walk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (!nr_ranges)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	 * Exclusion of crash region and/or crashk_low_res may cause
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	 * another range split. So add extra two slots here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	nr_ranges += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (!cmem)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	cmem->max_nr_ranges = nr_ranges;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	cmem->nr_ranges = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	return cmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)  * Look for any unwanted ranges between mstart, mend and remove them. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  * might lead to split and split ranges are put in cmem->ranges[] array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static int elf_header_exclude_ranges(struct crash_mem *cmem)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	/* Exclude the low 1M because it is always reserved */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	ret = crash_exclude_mem_range(cmem, 0, (1<<20)-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	/* Exclude crashkernel region */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (crashk_low_res.end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		ret = crash_exclude_mem_range(cmem, crashk_low_res.start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 					      crashk_low_res.end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static int prepare_elf64_ram_headers_callback(struct resource *res, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	struct crash_mem *cmem = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	cmem->ranges[cmem->nr_ranges].start = res->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	cmem->ranges[cmem->nr_ranges].end = res->end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	cmem->nr_ranges++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	return 0;
^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) /* Prepare elf headers. Return addr and size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static int prepare_elf_headers(struct kimage *image, void **addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 					unsigned long *sz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct crash_mem *cmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	cmem = fill_up_crash_elf_data();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if (!cmem)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	ret = walk_system_ram_res(0, -1, cmem, prepare_elf64_ram_headers_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	/* Exclude unwanted mem ranges */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	ret = elf_header_exclude_ranges(cmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	/* By default prepare 64bit headers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	ret =  crash_prepare_elf64_headers(cmem, IS_ENABLED(CONFIG_X86_64), addr, sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	vfree(cmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static int add_e820_entry(struct boot_params *params, struct e820_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	unsigned int nr_e820_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	nr_e820_entries = params->e820_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (nr_e820_entries >= E820_MAX_ENTRIES_ZEROPAGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	memcpy(&params->e820_table[nr_e820_entries], entry, sizeof(struct e820_entry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	params->e820_entries++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) static int memmap_entry_callback(struct resource *res, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	struct crash_memmap_data *cmd = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	struct boot_params *params = cmd->params;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	struct e820_entry ei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	ei.addr = res->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	ei.size = resource_size(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	ei.type = cmd->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	add_e820_entry(params, &ei);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) static int memmap_exclude_ranges(struct kimage *image, struct crash_mem *cmem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 				 unsigned long long mstart,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 				 unsigned long long mend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	unsigned long start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	cmem->ranges[0].start = mstart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	cmem->ranges[0].end = mend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	cmem->nr_ranges = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/* Exclude elf header region */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	start = image->arch.elf_load_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	end = start + image->arch.elf_headers_sz - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	return crash_exclude_mem_range(cmem, start, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /* Prepare memory map for crash dump kernel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int crash_setup_memmap_entries(struct kimage *image, struct boot_params *params)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	int i, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	struct e820_entry ei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	struct crash_memmap_data cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	struct crash_mem *cmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	cmem = vzalloc(struct_size(cmem, ranges, 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	if (!cmem)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	memset(&cmd, 0, sizeof(struct crash_memmap_data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	cmd.params = params;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	/* Add the low 1M */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	cmd.type = E820_TYPE_RAM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	walk_iomem_res_desc(IORES_DESC_NONE, flags, 0, (1<<20)-1, &cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			    memmap_entry_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	/* Add ACPI tables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	cmd.type = E820_TYPE_ACPI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	flags = IORESOURCE_MEM | IORESOURCE_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	walk_iomem_res_desc(IORES_DESC_ACPI_TABLES, flags, 0, -1, &cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 			    memmap_entry_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	/* Add ACPI Non-volatile Storage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	cmd.type = E820_TYPE_NVS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	walk_iomem_res_desc(IORES_DESC_ACPI_NV_STORAGE, flags, 0, -1, &cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 			    memmap_entry_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	/* Add e820 reserved ranges */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	cmd.type = E820_TYPE_RESERVED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	flags = IORESOURCE_MEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	walk_iomem_res_desc(IORES_DESC_RESERVED, flags, 0, -1, &cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 			    memmap_entry_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	/* Add crashk_low_res region */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	if (crashk_low_res.end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		ei.addr = crashk_low_res.start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		ei.size = resource_size(&crashk_low_res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		ei.type = E820_TYPE_RAM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		add_e820_entry(params, &ei);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	/* Exclude some ranges from crashk_res and add rest to memmap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	ret = memmap_exclude_ranges(image, cmem, crashk_res.start, crashk_res.end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	for (i = 0; i < cmem->nr_ranges; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		ei.size = cmem->ranges[i].end - cmem->ranges[i].start + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 		/* If entry is less than a page, skip it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		if (ei.size < PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		ei.addr = cmem->ranges[i].start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		ei.type = E820_TYPE_RAM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		add_e820_entry(params, &ei);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	vfree(cmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) int crash_load_segments(struct kimage *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	struct kexec_buf kbuf = { .image = image, .buf_min = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 				  .buf_max = ULONG_MAX, .top_down = false };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	/* Prepare elf headers and add a segment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	ret = prepare_elf_headers(image, &kbuf.buffer, &kbuf.bufsz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	image->arch.elf_headers = kbuf.buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	image->arch.elf_headers_sz = kbuf.bufsz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	kbuf.memsz = kbuf.bufsz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	ret = kexec_add_buffer(&kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 		vfree((void *)image->arch.elf_headers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	image->arch.elf_load_addr = kbuf.mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	pr_debug("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		 image->arch.elf_load_addr, kbuf.bufsz, kbuf.bufsz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) #endif /* CONFIG_KEXEC_FILE */