arch/sh/kernel/machine_kexec.c

   1 /*
   2  * machine_kexec.c - handle transition of Linux booting another kernel
   3  * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
   4  *
   5  * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
   6  * LANDISK/sh4 supported by kogiidena
   7  *
   8  * This source code is licensed under the GNU General Public License,
   9  * Version 2.  See the file COPYING for more details.
  10  */
  11 #include <linux/mm.h>
  12 #include <linux/kexec.h>
  13 #include <linux/delay.h>
  14 #include <linux/reboot.h>
  15 #include <linux/numa.h>
  16 #include <linux/ftrace.h>
  17 #include <linux/suspend.h>
  18 #include <linux/memblock.h>
  19 #include <asm/pgtable.h>
  20 #include <asm/pgalloc.h>
  21 #include <asm/mmu_context.h>
  22 #include <asm/io.h>
  23 #include <asm/cacheflush.h>
  24 #include <asm/sh_bios.h>
  25 #include <asm/reboot.h>
  26
  27 typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
  28                                       unsigned long reboot_code_buffer,
  29                                       unsigned long start_address);
  30
  31 extern const unsigned char relocate_new_kernel[];
  32 extern const unsigned int relocate_new_kernel_size;
  33 extern void *vbr_base;
  34
  35 void native_machine_crash_shutdown(struct pt_regs *regs)
  36 {
  37         /* Nothing to do for UP, but definitely broken for SMP.. */
  38 }
  39
  40 /*
  41  * Do what every setup is needed on image and the
  42  * reboot code buffer to allow us to avoid allocations
  43  * later.
  44  */
  45 int machine_kexec_prepare(struct kimage *image)
  46 {
  47         return 0;
  48 }
  49
  50 void machine_kexec_cleanup(struct kimage *image)
  51 {
  52 }
  53
  54 static void kexec_info(struct kimage *image)
  55 {
  56         int i;
  57         printk("kexec information\n");
  58         for (i = 0; i < image->nr_segments; i++) {
  59                 printk("  segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
  60                        i,
  61                        (unsigned int)image->segment[i].mem,
  62                        (unsigned int)image->segment[i].mem +
  63                                      image->segment[i].memsz,
  64                        (unsigned int)image->segment[i].memsz);
  65         }
  66         printk("  start     : 0x%08x\n\n", (unsigned int)image->start);
  67 }
  68
  69 /*
  70  * Do not allocate memory (or fail in any way) in machine_kexec().
  71  * We are past the point of no return, committed to rebooting now.
  72  */
  73 void machine_kexec(struct kimage *image)
  74 {
  75         unsigned long page_list;
  76         unsigned long reboot_code_buffer;
  77         relocate_new_kernel_t rnk;
  78         unsigned long entry;
  79         unsigned long *ptr;
  80         int save_ftrace_enabled;
  81
  82         /*
  83          * Nicked from the mips version of machine_kexec():
  84          * The generic kexec code builds a page list with physical
  85          * addresses. Use phys_to_virt() to convert them to virtual.
  86          */
  87         for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
  88              ptr = (entry & IND_INDIRECTION) ?
  89                phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
  90                 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
  91                     *ptr & IND_DESTINATION)
  92                         *ptr = (unsigned long) phys_to_virt(*ptr);
  93         }
  94
  95 #ifdef CONFIG_KEXEC_JUMP
  96         if (image->preserve_context)
  97                 save_processor_state();
  98 #endif
  99
 100         save_ftrace_enabled = __ftrace_enabled_save();
 101
 102         /* Interrupts aren't acceptable while we reboot */
 103         local_irq_disable();
 104
 105         page_list = image->head;
 106
 107         /* we need both effective and real address here */
 108         reboot_code_buffer =
 109                         (unsigned long)page_address(image->control_code_page);
 110
 111         /* copy our kernel relocation code to the control code page */
 112         memcpy((void *)reboot_code_buffer, relocate_new_kernel,
 113                                                 relocate_new_kernel_size);
 114
 115         kexec_info(image);
 116         flush_cache_all();
 117
 118         sh_bios_vbr_reload();
 119
 120         /* now call it */
 121         rnk = (relocate_new_kernel_t) reboot_code_buffer;
 122         (*rnk)(page_list, reboot_code_buffer,
 123                (unsigned long)phys_to_virt(image->start));
 124
 125 #ifdef CONFIG_KEXEC_JUMP
 126         asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
 127
 128         if (image->preserve_context)
 129                 restore_processor_state();
 130
 131         /* Convert page list back to physical addresses, what a mess. */
 132         for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
 133              ptr = (*ptr & IND_INDIRECTION) ?
 134                phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
 135                 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
 136                     *ptr & IND_DESTINATION)
 137                         *ptr = virt_to_phys(*ptr);
 138         }
 139 #endif
 140
 141         __ftrace_enabled_restore(save_ftrace_enabled);
 142 }
 143
 144 void arch_crash_save_vmcoreinfo(void)
 145 {
 146 #ifdef CONFIG_NUMA
 147         VMCOREINFO_SYMBOL(node_data);
 148         VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
 149 #endif
 150 #ifdef CONFIG_X2TLB
 151         VMCOREINFO_CONFIG(X2TLB);
 152 #endif
 153 }
 154
 155 void __init reserve_crashkernel(void)
 156 {
 157         unsigned long long crash_size, crash_base;
 158         int ret;
 159
 160         ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
 161                         &crash_size, &crash_base);
 162         if (ret == 0 && crash_size > 0) {
 163                 crashk_res.start = crash_base;
 164                 crashk_res.end = crash_base + crash_size - 1;
 165         }
 166
 167         if (crashk_res.end == crashk_res.start)
 168                 goto disable;
 169
 170         crash_size = PAGE_ALIGN(resource_size(&crashk_res));
 171         if (!crashk_res.start) {
 172                 unsigned long max = memblock_end_of_DRAM() - memory_limit;
 173                 crashk_res.start = __memblock_alloc_base(crash_size, PAGE_SIZE, max);
 174                 if (!crashk_res.start) {
 175                         pr_err("crashkernel allocation failed\n");
 176                         goto disable;
 177                 }
 178         } else {
 179                 ret = memblock_reserve(crashk_res.start, crash_size);
 180                 if (unlikely(ret < 0)) {
 181                         pr_err("crashkernel reservation failed - "
 182                                "memory is in use\n");
 183                         goto disable;
 184                 }
 185         }
 186
 187         crashk_res.end = crashk_res.start + crash_size - 1;
 188
 189         /*
 190          * Crash kernel trumps memory limit
 191          */
 192         if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
 193                 memory_limit = 0;
 194                 pr_info("Disabled memory limit for crashkernel\n");
 195         }
 196
 197         pr_info("Reserving %ldMB of memory at 0x%08lx "
 198                 "for crashkernel (System RAM: %ldMB)\n",
 199                 (unsigned long)(crash_size >> 20),
 200                 (unsigned long)(crashk_res.start),
 201                 (unsigned long)(memblock_phys_mem_size() >> 20));
 202
 203         return;
 204
 205 disable:
 206         crashk_res.start = crashk_res.end = 0;
 207 }