arch/powerpc/kernel/machine

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This source file includes following definitions.
machine_kexec_mask_interrupts
machine_crash_shutdown
machine_kexec_prepare
machine_kexec_cleanup
arch_crash_save_vmcoreinfo
machine_kexec
reserve_crashkernel
overlaps_crashkernel
export_crashk_values
kexec_setup
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Code to handle transition of Linux booting another kernel.
   4  *
   5  * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
   6  * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
   7  * Copyright (C) 2005 IBM Corporation.
   8  */
   9 
  10 #include <linux/kexec.h>
  11 #include <linux/reboot.h>
  12 #include <linux/threads.h>
  13 #include <linux/memblock.h>
  14 #include <linux/of.h>
  15 #include <linux/irq.h>
  16 #include <linux/ftrace.h>
  17 
  18 #include <asm/kdump.h>
  19 #include <asm/machdep.h>
  20 #include <asm/pgalloc.h>
  21 #include <asm/prom.h>
  22 #include <asm/sections.h>
  23 
  24 void machine_kexec_mask_interrupts(void) {
  25         unsigned int i;
  26         struct irq_desc *desc;
  27 
  28         for_each_irq_desc(i, desc) {
  29                 struct irq_chip *chip;
  30 
  31                 chip = irq_desc_get_chip(desc);
  32                 if (!chip)
  33                         continue;
  34 
  35                 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
  36                         chip->irq_eoi(&desc->irq_data);
  37 
  38                 if (chip->irq_mask)
  39                         chip->irq_mask(&desc->irq_data);
  40 
  41                 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
  42                         chip->irq_disable(&desc->irq_data);
  43         }
  44 }
  45 
  46 void machine_crash_shutdown(struct pt_regs *regs)
  47 {
  48         default_machine_crash_shutdown(regs);
  49 }
  50 
  51 /*
  52  * Do what every setup is needed on image and the
  53  * reboot code buffer to allow us to avoid allocations
  54  * later.
  55  */
  56 int machine_kexec_prepare(struct kimage *image)
  57 {
  58         if (ppc_md.machine_kexec_prepare)
  59                 return ppc_md.machine_kexec_prepare(image);
  60         else
  61                 return default_machine_kexec_prepare(image);
  62 }
  63 
  64 void machine_kexec_cleanup(struct kimage *image)
  65 {
  66 }
  67 
  68 void arch_crash_save_vmcoreinfo(void)
  69 {
  70 
  71 #ifdef CONFIG_NEED_MULTIPLE_NODES
  72         VMCOREINFO_SYMBOL(node_data);
  73         VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
  74 #endif
  75 #ifndef CONFIG_NEED_MULTIPLE_NODES
  76         VMCOREINFO_SYMBOL(contig_page_data);
  77 #endif
  78 #if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
  79         VMCOREINFO_SYMBOL(vmemmap_list);
  80         VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
  81         VMCOREINFO_SYMBOL(mmu_psize_defs);
  82         VMCOREINFO_STRUCT_SIZE(vmemmap_backing);
  83         VMCOREINFO_OFFSET(vmemmap_backing, list);
  84         VMCOREINFO_OFFSET(vmemmap_backing, phys);
  85         VMCOREINFO_OFFSET(vmemmap_backing, virt_addr);
  86         VMCOREINFO_STRUCT_SIZE(mmu_psize_def);
  87         VMCOREINFO_OFFSET(mmu_psize_def, shift);
  88 #endif
  89 }
  90 
  91 /*
  92  * Do not allocate memory (or fail in any way) in machine_kexec().
  93  * We are past the point of no return, committed to rebooting now.
  94  */
  95 void machine_kexec(struct kimage *image)
  96 {
  97         int save_ftrace_enabled;
  98 
  99         save_ftrace_enabled = __ftrace_enabled_save();
 100         this_cpu_disable_ftrace();
 101 
 102         if (ppc_md.machine_kexec)
 103                 ppc_md.machine_kexec(image);
 104         else
 105                 default_machine_kexec(image);
 106 
 107         this_cpu_enable_ftrace();
 108         __ftrace_enabled_restore(save_ftrace_enabled);
 109 
 110         /* Fall back to normal restart if we're still alive. */
 111         machine_restart(NULL);
 112         for(;;);
 113 }
 114 
 115 void __init reserve_crashkernel(void)
 116 {
 117         unsigned long long crash_size, crash_base;
 118         int ret;
 119 
 120         /* use common parsing */
 121         ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
 122                         &crash_size, &crash_base);
 123         if (ret == 0 && crash_size > 0) {
 124                 crashk_res.start = crash_base;
 125                 crashk_res.end = crash_base + crash_size - 1;
 126         }
 127 
 128         if (crashk_res.end == crashk_res.start) {
 129                 crashk_res.start = crashk_res.end = 0;
 130                 return;
 131         }
 132 
 133         /* We might have got these values via the command line or the
 134          * device tree, either way sanitise them now. */
 135 
 136         crash_size = resource_size(&crashk_res);
 137 
 138 #ifndef CONFIG_NONSTATIC_KERNEL
 139         if (crashk_res.start != KDUMP_KERNELBASE)
 140                 printk("Crash kernel location must be 0x%x\n",
 141                                 KDUMP_KERNELBASE);
 142 
 143         crashk_res.start = KDUMP_KERNELBASE;
 144 #else
 145         if (!crashk_res.start) {
 146 #ifdef CONFIG_PPC64
 147                 /*
 148                  * On 64bit we split the RMO in half but cap it at half of
 149                  * a small SLB (128MB) since the crash kernel needs to place
 150                  * itself and some stacks to be in the first segment.
 151                  */
 152                 crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
 153 #else
 154                 crashk_res.start = KDUMP_KERNELBASE;
 155 #endif
 156         }
 157 
 158         crash_base = PAGE_ALIGN(crashk_res.start);
 159         if (crash_base != crashk_res.start) {
 160                 printk("Crash kernel base must be aligned to 0x%lx\n",
 161                                 PAGE_SIZE);
 162                 crashk_res.start = crash_base;
 163         }
 164 
 165 #endif
 166         crash_size = PAGE_ALIGN(crash_size);
 167         crashk_res.end = crashk_res.start + crash_size - 1;
 168 
 169         /* The crash region must not overlap the current kernel */
 170         if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
 171                 printk(KERN_WARNING
 172                         "Crash kernel can not overlap current kernel\n");
 173                 crashk_res.start = crashk_res.end = 0;
 174                 return;
 175         }
 176 
 177         /* Crash kernel trumps memory limit */
 178         if (memory_limit && memory_limit <= crashk_res.end) {
 179                 memory_limit = crashk_res.end + 1;
 180                 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
 181                        memory_limit);
 182         }
 183 
 184         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 185                         "for crashkernel (System RAM: %ldMB)\n",
 186                         (unsigned long)(crash_size >> 20),
 187                         (unsigned long)(crashk_res.start >> 20),
 188                         (unsigned long)(memblock_phys_mem_size() >> 20));
 189 
 190         if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
 191             memblock_reserve(crashk_res.start, crash_size)) {
 192                 pr_err("Failed to reserve memory for crashkernel!\n");
 193                 crashk_res.start = crashk_res.end = 0;
 194                 return;
 195         }
 196 }
 197 
 198 int overlaps_crashkernel(unsigned long start, unsigned long size)
 199 {
 200         return (start + size) > crashk_res.start && start <= crashk_res.end;
 201 }
 202 
 203 /* Values we need to export to the second kernel via the device tree. */
 204 static phys_addr_t kernel_end;
 205 static phys_addr_t crashk_base;
 206 static phys_addr_t crashk_size;
 207 static unsigned long long mem_limit;
 208 
 209 static struct property kernel_end_prop = {
 210         .name = "linux,kernel-end",
 211         .length = sizeof(phys_addr_t),
 212         .value = &kernel_end,
 213 };
 214 
 215 static struct property crashk_base_prop = {
 216         .name = "linux,crashkernel-base",
 217         .length = sizeof(phys_addr_t),
 218         .value = &crashk_base
 219 };
 220 
 221 static struct property crashk_size_prop = {
 222         .name = "linux,crashkernel-size",
 223         .length = sizeof(phys_addr_t),
 224         .value = &crashk_size,
 225 };
 226 
 227 static struct property memory_limit_prop = {
 228         .name = "linux,memory-limit",
 229         .length = sizeof(unsigned long long),
 230         .value = &mem_limit,
 231 };
 232 
 233 #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
 234 
 235 static void __init export_crashk_values(struct device_node *node)
 236 {
 237         /* There might be existing crash kernel properties, but we can't
 238          * be sure what's in them, so remove them. */
 239         of_remove_property(node, of_find_property(node,
 240                                 "linux,crashkernel-base", NULL));
 241         of_remove_property(node, of_find_property(node,
 242                                 "linux,crashkernel-size", NULL));
 243 
 244         if (crashk_res.start != 0) {
 245                 crashk_base = cpu_to_be_ulong(crashk_res.start),
 246                 of_add_property(node, &crashk_base_prop);
 247                 crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
 248                 of_add_property(node, &crashk_size_prop);
 249         }
 250 
 251         /*
 252          * memory_limit is required by the kexec-tools to limit the
 253          * crash regions to the actual memory used.
 254          */
 255         mem_limit = cpu_to_be_ulong(memory_limit);
 256         of_update_property(node, &memory_limit_prop);
 257 }
 258 
 259 static int __init kexec_setup(void)
 260 {
 261         struct device_node *node;
 262 
 263         node = of_find_node_by_path("/chosen");
 264         if (!node)
 265                 return -ENOENT;
 266 
 267         /* remove any stale properties so ours can be found */
 268         of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL));
 269 
 270         /* information needed by userspace when using default_machine_kexec */
 271         kernel_end = cpu_to_be_ulong(__pa(_end));
 272         of_add_property(node, &kernel_end_prop);
 273 
 274         export_crashk_values(node);
 275 
 276         of_node_put(node);
 277         return 0;
 278 }
 279 late_initcall(kexec_setup);
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root/arch/powerpc/kernel/machine_kexec.c

DEFINITIONS
