Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 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> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 9 | #include <linux/io.h> |
Will Deacon | 9141a00 | 2012-02-03 14:48:01 +0100 | [diff] [blame] | 10 | #include <linux/irq.h> |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 11 | #include <asm/pgtable.h> |
| 12 | #include <asm/pgalloc.h> |
| 13 | #include <asm/mmu_context.h> |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 14 | #include <asm/cacheflush.h> |
| 15 | #include <asm/mach-types.h> |
Will Deacon | 3bdc348 | 2011-06-06 12:35:46 +0100 | [diff] [blame] | 16 | #include <asm/system.h> |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 17 | |
Tobias Klauser | e0fc4f9 | 2009-02-09 21:35:39 +0100 | [diff] [blame] | 18 | extern const unsigned char relocate_new_kernel[]; |
| 19 | extern const unsigned int relocate_new_kernel_size; |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 20 | |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 21 | extern unsigned long kexec_start_address; |
| 22 | extern unsigned long kexec_indirection_page; |
| 23 | extern unsigned long kexec_mach_type; |
Richard Purdie | 4cd9d6f | 2008-01-02 00:56:46 +0100 | [diff] [blame] | 24 | extern unsigned long kexec_boot_atags; |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 25 | |
Per Fransson | b230653 | 2010-12-03 10:53:38 +0100 | [diff] [blame] | 26 | static atomic_t waiting_for_crash_ipi; |
| 27 | |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 28 | /* |
| 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 | |
| 33 | int machine_kexec_prepare(struct kimage *image) |
| 34 | { |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | void machine_kexec_cleanup(struct kimage *image) |
| 39 | { |
| 40 | } |
| 41 | |
Per Fransson | b230653 | 2010-12-03 10:53:38 +0100 | [diff] [blame] | 42 | void machine_crash_nonpanic_core(void *unused) |
| 43 | { |
| 44 | struct pt_regs regs; |
| 45 | |
| 46 | crash_setup_regs(®s, 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(®s, smp_processor_id()); |
| 50 | flush_cache_all(); |
| 51 | |
| 52 | atomic_dec(&waiting_for_crash_ipi); |
| 53 | while (1) |
| 54 | cpu_relax(); |
| 55 | } |
| 56 | |
Will Deacon | 9141a00 | 2012-02-03 14:48:01 +0100 | [diff] [blame] | 57 | static 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 Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 80 | void machine_crash_shutdown(struct pt_regs *regs) |
| 81 | { |
Per Fransson | b230653 | 2010-12-03 10:53:38 +0100 | [diff] [blame] | 82 | unsigned long msecs; |
| 83 | |
Mika Westerberg | c638362 | 2010-05-10 09:23:37 +0100 | [diff] [blame] | 84 | local_irq_disable(); |
Per Fransson | b230653 | 2010-12-03 10:53:38 +0100 | [diff] [blame] | 85 | |
| 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 Westerberg | c638362 | 2010-05-10 09:23:37 +0100 | [diff] [blame] | 96 | crash_save_cpu(regs, smp_processor_id()); |
Will Deacon | 9141a00 | 2012-02-03 14:48:01 +0100 | [diff] [blame] | 97 | machine_kexec_mask_interrupts(); |
Mika Westerberg | c638362 | 2010-05-10 09:23:37 +0100 | [diff] [blame] | 98 | |
| 99 | printk(KERN_INFO "Loading crashdump kernel...\n"); |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 100 | } |
| 101 | |
Eric Cooper | 868d172b | 2011-02-02 17:16:09 -0500 | [diff] [blame] | 102 | /* |
| 103 | * Function pointer to optional machine-specific reinitialization |
| 104 | */ |
| 105 | void (*kexec_reinit)(void); |
| 106 | |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 107 | void machine_kexec(struct kimage *image) |
| 108 | { |
Russell King | abf015f | 2011-11-07 19:04:36 +0000 | [diff] [blame] | 109 | unsigned long page_list; |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 110 | unsigned long reboot_code_buffer_phys; |
| 111 | void *reboot_code_buffer; |
| 112 | |
Russell King | abf015f | 2011-11-07 19:04:36 +0000 | [diff] [blame] | 113 | |
| 114 | page_list = image->head & PAGE_MASK; |
| 115 | |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 116 | /* 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 King | abf015f | 2011-11-07 19:04:36 +0000 | [diff] [blame] | 121 | /* 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 Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 134 | printk(KERN_INFO "Bye!\n"); |
| 135 | |
Eric Cooper | 868d172b | 2011-02-02 17:16:09 -0500 | [diff] [blame] | 136 | if (kexec_reinit) |
| 137 | kexec_reinit(); |
Will Deacon | 3bdc348 | 2011-06-06 12:35:46 +0100 | [diff] [blame] | 138 | |
| 139 | soft_restart(reboot_code_buffer_phys); |
Richard Purdie | c587e4a | 2007-02-06 21:29:00 +0100 | [diff] [blame] | 140 | } |