Commit | Line | Data |
---|---|---|
c587e4a6 RP |
1 | /* |
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> | |
fced80c7 | 9 | #include <linux/io.h> |
9141a003 | 10 | #include <linux/irq.h> |
c587e4a6 | 11 | #include <asm/pgtable.h> |
4cabd1d9 | 12 | #include <linux/of_fdt.h> |
c587e4a6 RP |
13 | #include <asm/pgalloc.h> |
14 | #include <asm/mmu_context.h> | |
c587e4a6 RP |
15 | #include <asm/cacheflush.h> |
16 | #include <asm/mach-types.h> | |
9f97da78 | 17 | #include <asm/system_misc.h> |
c587e4a6 | 18 | |
e0fc4f97 TK |
19 | extern const unsigned char relocate_new_kernel[]; |
20 | extern const unsigned int relocate_new_kernel_size; | |
c587e4a6 | 21 | |
c587e4a6 RP |
22 | extern unsigned long kexec_start_address; |
23 | extern unsigned long kexec_indirection_page; | |
24 | extern unsigned long kexec_mach_type; | |
4cd9d6f7 | 25 | extern unsigned long kexec_boot_atags; |
c587e4a6 | 26 | |
b2306531 PF |
27 | static atomic_t waiting_for_crash_ipi; |
28 | ||
c587e4a6 RP |
29 | /* |
30 | * Provide a dummy crash_notes definition while crash dump arrives to arm. | |
31 | * This prevents breakage of crash_notes attribute in kernel/ksysfs.c. | |
32 | */ | |
33 | ||
34 | int machine_kexec_prepare(struct kimage *image) | |
35 | { | |
4cabd1d9 ML |
36 | struct kexec_segment *current_segment; |
37 | __be32 header; | |
38 | int i, err; | |
39 | ||
40 | /* | |
41 | * No segment at default ATAGs address. try to locate | |
42 | * a dtb using magic. | |
43 | */ | |
44 | for (i = 0; i < image->nr_segments; i++) { | |
45 | current_segment = &image->segment[i]; | |
46 | ||
47 | err = get_user(header, (__be32*)current_segment->buf); | |
48 | if (err) | |
49 | return err; | |
50 | ||
51 | if (be32_to_cpu(header) == OF_DT_HEADER) | |
52 | kexec_boot_atags = current_segment->mem; | |
53 | } | |
c587e4a6 RP |
54 | return 0; |
55 | } | |
56 | ||
57 | void machine_kexec_cleanup(struct kimage *image) | |
58 | { | |
59 | } | |
60 | ||
b2306531 PF |
61 | void machine_crash_nonpanic_core(void *unused) |
62 | { | |
63 | struct pt_regs regs; | |
64 | ||
65 | crash_setup_regs(®s, NULL); | |
66 | printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n", | |
67 | smp_processor_id()); | |
68 | crash_save_cpu(®s, smp_processor_id()); | |
69 | flush_cache_all(); | |
70 | ||
71 | atomic_dec(&waiting_for_crash_ipi); | |
72 | while (1) | |
73 | cpu_relax(); | |
74 | } | |
75 | ||
9141a003 WD |
76 | static void machine_kexec_mask_interrupts(void) |
77 | { | |
78 | unsigned int i; | |
79 | struct irq_desc *desc; | |
80 | ||
81 | for_each_irq_desc(i, desc) { | |
82 | struct irq_chip *chip; | |
83 | ||
84 | chip = irq_desc_get_chip(desc); | |
85 | if (!chip) | |
86 | continue; | |
87 | ||
88 | if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) | |
89 | chip->irq_eoi(&desc->irq_data); | |
90 | ||
91 | if (chip->irq_mask) | |
92 | chip->irq_mask(&desc->irq_data); | |
93 | ||
94 | if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) | |
95 | chip->irq_disable(&desc->irq_data); | |
96 | } | |
97 | } | |
98 | ||
c587e4a6 RP |
99 | void machine_crash_shutdown(struct pt_regs *regs) |
100 | { | |
b2306531 PF |
101 | unsigned long msecs; |
102 | ||
c6383620 | 103 | local_irq_disable(); |
b2306531 PF |
104 | |
105 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
106 | smp_call_function(machine_crash_nonpanic_core, NULL, false); | |
107 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ | |
108 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
109 | mdelay(1); | |
110 | msecs--; | |
111 | } | |
112 | if (atomic_read(&waiting_for_crash_ipi) > 0) | |
113 | printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n"); | |
114 | ||
c6383620 | 115 | crash_save_cpu(regs, smp_processor_id()); |
9141a003 | 116 | machine_kexec_mask_interrupts(); |
c6383620 MW |
117 | |
118 | printk(KERN_INFO "Loading crashdump kernel...\n"); | |
c587e4a6 RP |
119 | } |
120 | ||
868d172b EC |
121 | /* |
122 | * Function pointer to optional machine-specific reinitialization | |
123 | */ | |
124 | void (*kexec_reinit)(void); | |
125 | ||
c587e4a6 RP |
126 | void machine_kexec(struct kimage *image) |
127 | { | |
abf015f0 | 128 | unsigned long page_list; |
c587e4a6 RP |
129 | unsigned long reboot_code_buffer_phys; |
130 | void *reboot_code_buffer; | |
131 | ||
abf015f0 RK |
132 | |
133 | page_list = image->head & PAGE_MASK; | |
134 | ||
c587e4a6 RP |
135 | /* we need both effective and real address here */ |
136 | reboot_code_buffer_phys = | |
137 | page_to_pfn(image->control_code_page) << PAGE_SHIFT; | |
138 | reboot_code_buffer = page_address(image->control_code_page); | |
139 | ||
abf015f0 RK |
140 | /* Prepare parameters for reboot_code_buffer*/ |
141 | kexec_start_address = image->start; | |
142 | kexec_indirection_page = page_list; | |
143 | kexec_mach_type = machine_arch_type; | |
4cabd1d9 ML |
144 | if (!kexec_boot_atags) |
145 | kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET; | |
146 | ||
abf015f0 RK |
147 | |
148 | /* copy our kernel relocation code to the control code page */ | |
149 | memcpy(reboot_code_buffer, | |
150 | relocate_new_kernel, relocate_new_kernel_size); | |
151 | ||
152 | ||
153 | flush_icache_range((unsigned long) reboot_code_buffer, | |
154 | (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); | |
c587e4a6 RP |
155 | printk(KERN_INFO "Bye!\n"); |
156 | ||
868d172b EC |
157 | if (kexec_reinit) |
158 | kexec_reinit(); | |
3bdc3484 WD |
159 | |
160 | soft_restart(reboot_code_buffer_phys); | |
c587e4a6 | 161 | } |