blob: a30004476e70c01625eb4208280c2c963b165b21 [file] [log] [blame]
Richard Purdiec587e4a2007-02-06 21:29:00 +01001/*
2 * machine_kexec.c - handle transition of Linux booting another kernel
3 */
4
5#include <linux/mm.h>
6#include <linux/kexec.h>
7#include <linux/delay.h>
8#include <linux/reboot.h>
Russell Kingfced80c2008-09-06 12:10:45 +01009#include <linux/io.h>
Will Deacon9141a002012-02-03 14:48:01 +010010#include <linux/irq.h>
Richard Purdiec587e4a2007-02-06 21:29:00 +010011#include <asm/pgtable.h>
12#include <asm/pgalloc.h>
13#include <asm/mmu_context.h>
Richard Purdiec587e4a2007-02-06 21:29:00 +010014#include <asm/cacheflush.h>
15#include <asm/mach-types.h>
Will Deacon3bdc3482011-06-06 12:35:46 +010016#include <asm/system.h>
Richard Purdiec587e4a2007-02-06 21:29:00 +010017
Tobias Klausere0fc4f92009-02-09 21:35:39 +010018extern const unsigned char relocate_new_kernel[];
19extern const unsigned int relocate_new_kernel_size;
Richard Purdiec587e4a2007-02-06 21:29:00 +010020
Richard Purdiec587e4a2007-02-06 21:29:00 +010021extern unsigned long kexec_start_address;
22extern unsigned long kexec_indirection_page;
23extern unsigned long kexec_mach_type;
Richard Purdie4cd9d6f2008-01-02 00:56:46 +010024extern unsigned long kexec_boot_atags;
Richard Purdiec587e4a2007-02-06 21:29:00 +010025
Per Franssonb2306532010-12-03 10:53:38 +010026static atomic_t waiting_for_crash_ipi;
27
Richard Purdiec587e4a2007-02-06 21:29:00 +010028/*
29 * Provide a dummy crash_notes definition while crash dump arrives to arm.
30 * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
31 */
32
33int machine_kexec_prepare(struct kimage *image)
34{
35 return 0;
36}
37
38void machine_kexec_cleanup(struct kimage *image)
39{
40}
41
Per Franssonb2306532010-12-03 10:53:38 +010042void machine_crash_nonpanic_core(void *unused)
43{
44 struct pt_regs regs;
45
46 crash_setup_regs(&regs, NULL);
47 printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
48 smp_processor_id());
49 crash_save_cpu(&regs, smp_processor_id());
50 flush_cache_all();
51
52 atomic_dec(&waiting_for_crash_ipi);
53 while (1)
54 cpu_relax();
55}
56
Will Deacon9141a002012-02-03 14:48:01 +010057static void machine_kexec_mask_interrupts(void)
58{
59 unsigned int i;
60 struct irq_desc *desc;
61
62 for_each_irq_desc(i, desc) {
63 struct irq_chip *chip;
64
65 chip = irq_desc_get_chip(desc);
66 if (!chip)
67 continue;
68
69 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
70 chip->irq_eoi(&desc->irq_data);
71
72 if (chip->irq_mask)
73 chip->irq_mask(&desc->irq_data);
74
75 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
76 chip->irq_disable(&desc->irq_data);
77 }
78}
79
Richard Purdiec587e4a2007-02-06 21:29:00 +010080void machine_crash_shutdown(struct pt_regs *regs)
81{
Per Franssonb2306532010-12-03 10:53:38 +010082 unsigned long msecs;
83
Mika Westerbergc6383622010-05-10 09:23:37 +010084 local_irq_disable();
Per Franssonb2306532010-12-03 10:53:38 +010085
86 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
87 smp_call_function(machine_crash_nonpanic_core, NULL, false);
88 msecs = 1000; /* Wait at most a second for the other cpus to stop */
89 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
90 mdelay(1);
91 msecs--;
92 }
93 if (atomic_read(&waiting_for_crash_ipi) > 0)
94 printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
95
Mika Westerbergc6383622010-05-10 09:23:37 +010096 crash_save_cpu(regs, smp_processor_id());
Will Deacon9141a002012-02-03 14:48:01 +010097 machine_kexec_mask_interrupts();
Mika Westerbergc6383622010-05-10 09:23:37 +010098
99 printk(KERN_INFO "Loading crashdump kernel...\n");
Richard Purdiec587e4a2007-02-06 21:29:00 +0100100}
101
Eric Cooper868d172b2011-02-02 17:16:09 -0500102/*
103 * Function pointer to optional machine-specific reinitialization
104 */
105void (*kexec_reinit)(void);
106
Richard Purdiec587e4a2007-02-06 21:29:00 +0100107void machine_kexec(struct kimage *image)
108{
Russell Kingabf015f2011-11-07 19:04:36 +0000109 unsigned long page_list;
Richard Purdiec587e4a2007-02-06 21:29:00 +0100110 unsigned long reboot_code_buffer_phys;
111 void *reboot_code_buffer;
112
Russell Kingabf015f2011-11-07 19:04:36 +0000113
114 page_list = image->head & PAGE_MASK;
115
Richard Purdiec587e4a2007-02-06 21:29:00 +0100116 /* we need both effective and real address here */
117 reboot_code_buffer_phys =
118 page_to_pfn(image->control_code_page) << PAGE_SHIFT;
119 reboot_code_buffer = page_address(image->control_code_page);
120
Russell Kingabf015f2011-11-07 19:04:36 +0000121 /* Prepare parameters for reboot_code_buffer*/
122 kexec_start_address = image->start;
123 kexec_indirection_page = page_list;
124 kexec_mach_type = machine_arch_type;
125 kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
126
127 /* copy our kernel relocation code to the control code page */
128 memcpy(reboot_code_buffer,
129 relocate_new_kernel, relocate_new_kernel_size);
130
131
132 flush_icache_range((unsigned long) reboot_code_buffer,
133 (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
Richard Purdiec587e4a2007-02-06 21:29:00 +0100134 printk(KERN_INFO "Bye!\n");
135
Eric Cooper868d172b2011-02-02 17:16:09 -0500136 if (kexec_reinit)
137 kexec_reinit();
Will Deacon3bdc3482011-06-06 12:35:46 +0100138
139 soft_restart(reboot_code_buffer_phys);
Richard Purdiec587e4a2007-02-06 21:29:00 +0100140}