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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 static unsigned long dt_mem;
 33 /*
 34  * Provide a dummy crash_notes definition while crash dump arrives to arm.
 35  * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
 36  */
 37 
 38 int machine_kexec_prepare(struct kimage *image)
 39 {
 40         struct kexec_segment *current_segment;
 41         __be32 header;
 42         int i, err;
 43 
 44         /*
 45          * Validate that if the current HW supports SMP, then the SW supports
 46          * and implements CPU hotplug for the current HW. If not, we won't be
 47          * able to kexec reliably, so fail the prepare operation.
 48          */
 49         if (num_possible_cpus() > 1 && !platform_can_cpu_hotplug())
 50                 return -EINVAL;
 51 
 52         /*
 53          * No segment at default ATAGs address. try to locate
 54          * a dtb using magic.
 55          */
 56         for (i = 0; i < image->nr_segments; i++) {
 57                 current_segment = &image->segment[i];
 58 
 59                 if (!memblock_is_region_memory(current_segment->mem,
 60                                                current_segment->memsz))
 61                         return -EINVAL;
 62 
 63                 err = get_user(header, (__be32*)current_segment->buf);
 64                 if (err)
 65                         return err;
 66 
 67                 if (be32_to_cpu(header) == OF_DT_HEADER)
 68                         dt_mem = current_segment->mem;
 69         }
 70         return 0;
 71 }
 72 
 73 void machine_kexec_cleanup(struct kimage *image)
 74 {
 75 }
 76 
 77 void machine_crash_nonpanic_core(void *unused)
 78 {
 79         struct pt_regs regs;
 80 
 81         crash_setup_regs(&regs, NULL);
 82         printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
 83                smp_processor_id());
 84         crash_save_cpu(&regs, smp_processor_id());
 85         flush_cache_all();
 86 
 87         set_cpu_online(smp_processor_id(), false);
 88         atomic_dec(&waiting_for_crash_ipi);
 89         while (1)
 90                 cpu_relax();
 91 }
 92 
 93 static void machine_kexec_mask_interrupts(void)
 94 {
 95         unsigned int i;
 96         struct irq_desc *desc;
 97 
 98         for_each_irq_desc(i, desc) {
 99                 struct irq_chip *chip;
100 
101                 chip = irq_desc_get_chip(desc);
102                 if (!chip)
103                         continue;
104 
105                 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
106                         chip->irq_eoi(&desc->irq_data);
107 
108                 if (chip->irq_mask)
109                         chip->irq_mask(&desc->irq_data);
110 
111                 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
112                         chip->irq_disable(&desc->irq_data);
113         }
114 }
115 
116 void machine_crash_shutdown(struct pt_regs *regs)
117 {
118         unsigned long msecs;
119 
120         local_irq_disable();
121 
122         atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
123         smp_call_function(machine_crash_nonpanic_core, NULL, false);
124         msecs = 1000; /* Wait at most a second for the other cpus to stop */
125         while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
126                 mdelay(1);
127                 msecs--;
128         }
129         if (atomic_read(&waiting_for_crash_ipi) > 0)
130                 pr_warn("Non-crashing CPUs did not react to IPI\n");
131 
132         crash_save_cpu(regs, smp_processor_id());
133         machine_kexec_mask_interrupts();
134 
135         pr_info("Loading crashdump kernel...\n");
136 }
137 
138 /*
139  * Function pointer to optional machine-specific reinitialization
140  */
141 void (*kexec_reinit)(void);
142 
143 void machine_kexec(struct kimage *image)
144 {
145         unsigned long page_list;
146         unsigned long reboot_code_buffer_phys;
147         unsigned long reboot_entry = (unsigned long)relocate_new_kernel;
148         unsigned long reboot_entry_phys;
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         /* we need both effective and real address here */
162         reboot_code_buffer_phys =
163             page_to_pfn(image->control_code_page) << PAGE_SHIFT;
164         reboot_code_buffer = page_address(image->control_code_page);
165 
166         /* Prepare parameters for reboot_code_buffer*/
167         set_kernel_text_rw();
168         kexec_start_address = image->start;
169         kexec_indirection_page = page_list;
170         kexec_mach_type = machine_arch_type;
171         kexec_boot_atags = dt_mem ?: image->start - KEXEC_ARM_ZIMAGE_OFFSET
172                                      + KEXEC_ARM_ATAGS_OFFSET;
173 
174         /* copy our kernel relocation code to the control code page */
175         reboot_entry = fncpy(reboot_code_buffer,
176                              reboot_entry,
177                              relocate_new_kernel_size);
178         reboot_entry_phys = (unsigned long)reboot_entry +
179                 (reboot_code_buffer_phys - (unsigned long)reboot_code_buffer);
180 
181         pr_info("Bye!\n");
182 
183         if (kexec_reinit)
184                 kexec_reinit();
185 
186         soft_restart(reboot_entry_phys);
187 }
188 
189 void arch_crash_save_vmcoreinfo(void)
190 {
191 #ifdef CONFIG_ARM_LPAE
192         VMCOREINFO_CONFIG(ARM_LPAE);
193 #endif
194 }
195 

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