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Linux/arch/arm/kernel/machine_kexec.c

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  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>
  9 #include <linux/io.h>
 10 #include <linux/irq.h>
 11 #include <linux/memblock.h>
 12 #include <asm/pgtable.h>
 13 #include <linux/of_fdt.h>
 14 #include <asm/pgalloc.h>
 15 #include <asm/mmu_context.h>
 16 #include <asm/cacheflush.h>
 17 #include <asm/fncpy.h>
 18 #include <asm/mach-types.h>
 19 #include <asm/smp_plat.h>
 20 #include <asm/system_misc.h>
 21 #include <asm/set_memory.h>
 22 
 23 extern void relocate_new_kernel(void);
 24 extern const unsigned int relocate_new_kernel_size;
 25 
 26 extern unsigned long kexec_start_address;
 27 extern unsigned long kexec_indirection_page;
 28 extern unsigned long kexec_mach_type;
 29 extern unsigned long kexec_boot_atags;
 30 
 31 static atomic_t waiting_for_crash_ipi;
 32 
 33 static unsigned long dt_mem;
 34 /*
 35  * Provide a dummy crash_notes definition while crash dump arrives to arm.
 36  * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
 37  */
 38 
 39 int machine_kexec_prepare(struct kimage *image)
 40 {
 41         struct kexec_segment *current_segment;
 42         __be32 header;
 43         int i, err;
 44 
 45         /*
 46          * Validate that if the current HW supports SMP, then the SW supports
 47          * and implements CPU hotplug for the current HW. If not, we won't be
 48          * able to kexec reliably, so fail the prepare operation.
 49          */
 50         if (num_possible_cpus() > 1 && platform_can_secondary_boot() &&
 51             !platform_can_cpu_hotplug())
 52                 return -EINVAL;
 53 
 54         /*
 55          * No segment at default ATAGs address. try to locate
 56          * a dtb using magic.
 57          */
 58         for (i = 0; i < image->nr_segments; i++) {
 59                 current_segment = &image->segment[i];
 60 
 61                 if (!memblock_is_region_memory(idmap_to_phys(current_segment->mem),
 62                                                current_segment->memsz))
 63                         return -EINVAL;
 64 
 65                 err = get_user(header, (__be32*)current_segment->buf);
 66                 if (err)
 67                         return err;
 68 
 69                 if (be32_to_cpu(header) == OF_DT_HEADER)
 70                         dt_mem = current_segment->mem;
 71         }
 72         return 0;
 73 }
 74 
 75 void machine_kexec_cleanup(struct kimage *image)
 76 {
 77 }
 78 
 79 void machine_crash_nonpanic_core(void *unused)
 80 {
 81         struct pt_regs regs;
 82 
 83         crash_setup_regs(&regs, NULL);
 84         printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
 85                smp_processor_id());
 86         crash_save_cpu(&regs, smp_processor_id());
 87         flush_cache_all();
 88 
 89         set_cpu_online(smp_processor_id(), false);
 90         atomic_dec(&waiting_for_crash_ipi);
 91         while (1)
 92                 cpu_relax();
 93 }
 94 
 95 static void machine_kexec_mask_interrupts(void)
 96 {
 97         unsigned int i;
 98         struct irq_desc *desc;
 99 
100         for_each_irq_desc(i, desc) {
101                 struct irq_chip *chip;
102 
103                 chip = irq_desc_get_chip(desc);
104                 if (!chip)
105                         continue;
106 
107                 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
108                         chip->irq_eoi(&desc->irq_data);
109 
110                 if (chip->irq_mask)
111                         chip->irq_mask(&desc->irq_data);
112 
113                 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
114                         chip->irq_disable(&desc->irq_data);
115         }
116 }
117 
118 void machine_crash_shutdown(struct pt_regs *regs)
119 {
120         unsigned long msecs;
121 
122         local_irq_disable();
123 
124         atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
125         smp_call_function(machine_crash_nonpanic_core, NULL, false);
126         msecs = 1000; /* Wait at most a second for the other cpus to stop */
127         while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
128                 mdelay(1);
129                 msecs--;
130         }
131         if (atomic_read(&waiting_for_crash_ipi) > 0)
132                 pr_warn("Non-crashing CPUs did not react to IPI\n");
133 
134         crash_save_cpu(regs, smp_processor_id());
135         machine_kexec_mask_interrupts();
136 
137         pr_info("Loading crashdump kernel...\n");
138 }
139 
140 /*
141  * Function pointer to optional machine-specific reinitialization
142  */
143 void (*kexec_reinit)(void);
144 
145 void machine_kexec(struct kimage *image)
146 {
147         unsigned long page_list, reboot_entry_phys;
148         void (*reboot_entry)(void);
149         void *reboot_code_buffer;
150 
151         /*
152          * This can only happen if machine_shutdown() failed to disable some
153          * CPU, and that can only happen if the checks in
154          * machine_kexec_prepare() were not correct. If this fails, we can't
155          * reliably kexec anyway, so BUG_ON is appropriate.
156          */
157         BUG_ON(num_online_cpus() > 1);
158 
159         page_list = image->head & PAGE_MASK;
160 
161         reboot_code_buffer = page_address(image->control_code_page);
162 
163         /* Prepare parameters for reboot_code_buffer*/
164         set_kernel_text_rw();
165         kexec_start_address = image->start;
166         kexec_indirection_page = page_list;
167         kexec_mach_type = machine_arch_type;
168         kexec_boot_atags = dt_mem ?: image->start - KEXEC_ARM_ZIMAGE_OFFSET
169                                      + KEXEC_ARM_ATAGS_OFFSET;
170 
171         /* copy our kernel relocation code to the control code page */
172         reboot_entry = fncpy(reboot_code_buffer,
173                              &relocate_new_kernel,
174                              relocate_new_kernel_size);
175 
176         /* get the identity mapping physical address for the reboot code */
177         reboot_entry_phys = virt_to_idmap(reboot_entry);
178 
179         pr_info("Bye!\n");
180 
181         if (kexec_reinit)
182                 kexec_reinit();
183 
184         soft_restart(reboot_entry_phys);
185 }
186 
187 void arch_crash_save_vmcoreinfo(void)
188 {
189 #ifdef CONFIG_ARM_LPAE
190         VMCOREINFO_CONFIG(ARM_LPAE);
191 #endif
192 }
193 

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