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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 
 22 extern void relocate_new_kernel(void);
 23 extern const unsigned int relocate_new_kernel_size;
 24 
 25 extern unsigned long kexec_start_address;
 26 extern unsigned long kexec_indirection_page;
 27 extern unsigned long kexec_mach_type;
 28 extern unsigned long kexec_boot_atags;
 29 
 30 static atomic_t waiting_for_crash_ipi;
 31 
 32 /*
 33  * Provide a dummy crash_notes definition while crash dump arrives to arm.
 34  * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
 35  */
 36 
 37 int machine_kexec_prepare(struct kimage *image)
 38 {
 39         struct kexec_segment *current_segment;
 40         __be32 header;
 41         int i, err;
 42 
 43         /*
 44          * Validate that if the current HW supports SMP, then the SW supports
 45          * and implements CPU hotplug for the current HW. If not, we won't be
 46          * able to kexec reliably, so fail the prepare operation.
 47          */
 48         if (num_possible_cpus() > 1 && !platform_can_cpu_hotplug())
 49                 return -EINVAL;
 50 
 51         /*
 52          * No segment at default ATAGs address. try to locate
 53          * a dtb using magic.
 54          */
 55         for (i = 0; i < image->nr_segments; i++) {
 56                 current_segment = &image->segment[i];
 57 
 58                 if (!memblock_is_region_memory(current_segment->mem,
 59                                                current_segment->memsz))
 60                         return -EINVAL;
 61 
 62                 err = get_user(header, (__be32*)current_segment->buf);
 63                 if (err)
 64                         return err;
 65 
 66                 if (be32_to_cpu(header) == OF_DT_HEADER)
 67                         kexec_boot_atags = current_segment->mem;
 68         }
 69         return 0;
 70 }
 71 
 72 void machine_kexec_cleanup(struct kimage *image)
 73 {
 74 }
 75 
 76 void machine_crash_nonpanic_core(void *unused)
 77 {
 78         struct pt_regs regs;
 79 
 80         crash_setup_regs(&regs, NULL);
 81         printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
 82                smp_processor_id());
 83         crash_save_cpu(&regs, smp_processor_id());
 84         flush_cache_all();
 85 
 86         set_cpu_online(smp_processor_id(), false);
 87         atomic_dec(&waiting_for_crash_ipi);
 88         while (1)
 89                 cpu_relax();
 90 }
 91 
 92 static void machine_kexec_mask_interrupts(void)
 93 {
 94         unsigned int i;
 95         struct irq_desc *desc;
 96 
 97         for_each_irq_desc(i, desc) {
 98                 struct irq_chip *chip;
 99 
100                 chip = irq_desc_get_chip(desc);
101                 if (!chip)
102                         continue;
103 
104                 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
105                         chip->irq_eoi(&desc->irq_data);
106 
107                 if (chip->irq_mask)
108                         chip->irq_mask(&desc->irq_data);
109 
110                 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
111                         chip->irq_disable(&desc->irq_data);
112         }
113 }
114 
115 void machine_crash_shutdown(struct pt_regs *regs)
116 {
117         unsigned long msecs;
118 
119         local_irq_disable();
120 
121         atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
122         smp_call_function(machine_crash_nonpanic_core, NULL, false);
123         msecs = 1000; /* Wait at most a second for the other cpus to stop */
124         while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
125                 mdelay(1);
126                 msecs--;
127         }
128         if (atomic_read(&waiting_for_crash_ipi) > 0)
129                 printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
130 
131         crash_save_cpu(regs, smp_processor_id());
132         machine_kexec_mask_interrupts();
133 
134         printk(KERN_INFO "Loading crashdump kernel...\n");
135 }
136 
137 /*
138  * Function pointer to optional machine-specific reinitialization
139  */
140 void (*kexec_reinit)(void);
141 
142 void machine_kexec(struct kimage *image)
143 {
144         unsigned long page_list;
145         unsigned long reboot_code_buffer_phys;
146         unsigned long reboot_entry = (unsigned long)relocate_new_kernel;
147         unsigned long reboot_entry_phys;
148         void *reboot_code_buffer;
149 
150         /*
151          * This can only happen if machine_shutdown() failed to disable some
152          * CPU, and that can only happen if the checks in
153          * machine_kexec_prepare() were not correct. If this fails, we can't
154          * reliably kexec anyway, so BUG_ON is appropriate.
155          */
156         BUG_ON(num_online_cpus() > 1);
157 
158         page_list = image->head & PAGE_MASK;
159 
160         /* we need both effective and real address here */
161         reboot_code_buffer_phys =
162             page_to_pfn(image->control_code_page) << PAGE_SHIFT;
163         reboot_code_buffer = page_address(image->control_code_page);
164 
165         /* Prepare parameters for reboot_code_buffer*/
166         kexec_start_address = image->start;
167         kexec_indirection_page = page_list;
168         kexec_mach_type = machine_arch_type;
169         if (!kexec_boot_atags)
170                 kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
171 
172 
173         /* copy our kernel relocation code to the control code page */
174         reboot_entry = fncpy(reboot_code_buffer,
175                              reboot_entry,
176                              relocate_new_kernel_size);
177         reboot_entry_phys = (unsigned long)reboot_entry +
178                 (reboot_code_buffer_phys - (unsigned long)reboot_code_buffer);
179 
180         printk(KERN_INFO "Bye!\n");
181 
182         if (kexec_reinit)
183                 kexec_reinit();
184 
185         soft_restart(reboot_entry_phys);
186 }
187 
188 void arch_crash_save_vmcoreinfo(void)
189 {
190 #ifdef CONFIG_ARM_LPAE
191         VMCOREINFO_CONFIG(ARM_LPAE);
192 #endif
193 }
194 

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