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Linux/arch/arm/kernel/machine_kexec.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * machine_kexec.c - handle transition of Linux booting another kernel
  4  */
  5 
  6 #include <linux/mm.h>
  7 #include <linux/kexec.h>
  8 #include <linux/delay.h>
  9 #include <linux/reboot.h>
 10 #include <linux/io.h>
 11 #include <linux/irq.h>
 12 #include <linux/memblock.h>
 13 #include <asm/pgtable.h>
 14 #include <linux/of_fdt.h>
 15 #include <asm/pgalloc.h>
 16 #include <asm/mmu_context.h>
 17 #include <asm/cacheflush.h>
 18 #include <asm/fncpy.h>
 19 #include <asm/mach-types.h>
 20 #include <asm/smp_plat.h>
 21 #include <asm/system_misc.h>
 22 #include <asm/set_memory.h>
 23 
 24 extern void relocate_new_kernel(void);
 25 extern const unsigned int relocate_new_kernel_size;
 26 
 27 extern unsigned long kexec_start_address;
 28 extern unsigned long kexec_indirection_page;
 29 extern unsigned long kexec_mach_type;
 30 extern unsigned long kexec_boot_atags;
 31 
 32 static atomic_t waiting_for_crash_ipi;
 33 
 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         image->arch.kernel_r2 = image->start - KEXEC_ARM_ZIMAGE_OFFSET
 46                                      + KEXEC_ARM_ATAGS_OFFSET;
 47 
 48         /*
 49          * Validate that if the current HW supports SMP, then the SW supports
 50          * and implements CPU hotplug for the current HW. If not, we won't be
 51          * able to kexec reliably, so fail the prepare operation.
 52          */
 53         if (num_possible_cpus() > 1 && platform_can_secondary_boot() &&
 54             !platform_can_cpu_hotplug())
 55                 return -EINVAL;
 56 
 57         /*
 58          * No segment at default ATAGs address. try to locate
 59          * a dtb using magic.
 60          */
 61         for (i = 0; i < image->nr_segments; i++) {
 62                 current_segment = &image->segment[i];
 63 
 64                 if (!memblock_is_region_memory(idmap_to_phys(current_segment->mem),
 65                                                current_segment->memsz))
 66                         return -EINVAL;
 67 
 68                 err = get_user(header, (__be32*)current_segment->buf);
 69                 if (err)
 70                         return err;
 71 
 72                 if (header == cpu_to_be32(OF_DT_HEADER))
 73                         image->arch.kernel_r2 = current_segment->mem;
 74         }
 75         return 0;
 76 }
 77 
 78 void machine_kexec_cleanup(struct kimage *image)
 79 {
 80 }
 81 
 82 void machine_crash_nonpanic_core(void *unused)
 83 {
 84         struct pt_regs regs;
 85 
 86         crash_setup_regs(&regs, get_irq_regs());
 87         printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
 88                smp_processor_id());
 89         crash_save_cpu(&regs, smp_processor_id());
 90         flush_cache_all();
 91 
 92         set_cpu_online(smp_processor_id(), false);
 93         atomic_dec(&waiting_for_crash_ipi);
 94         while (1)
 95                 cpu_relax();
 96 }
 97 
 98 void crash_smp_send_stop(void)
 99 {
100         static int cpus_stopped;
101         unsigned long msecs;
102 
103         if (cpus_stopped)
104                 return;
105 
106         atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
107         smp_call_function(machine_crash_nonpanic_core, NULL, false);
108         msecs = 1000; /* Wait at most a second for the other cpus to stop */
109         while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
110                 mdelay(1);
111                 msecs--;
112         }
113         if (atomic_read(&waiting_for_crash_ipi) > 0)
114                 pr_warn("Non-crashing CPUs did not react to IPI\n");
115 
116         cpus_stopped = 1;
117 }
118 
119 static void machine_kexec_mask_interrupts(void)
120 {
121         unsigned int i;
122         struct irq_desc *desc;
123 
124         for_each_irq_desc(i, desc) {
125                 struct irq_chip *chip;
126 
127                 chip = irq_desc_get_chip(desc);
128                 if (!chip)
129                         continue;
130 
131                 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
132                         chip->irq_eoi(&desc->irq_data);
133 
134                 if (chip->irq_mask)
135                         chip->irq_mask(&desc->irq_data);
136 
137                 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
138                         chip->irq_disable(&desc->irq_data);
139         }
140 }
141 
142 void machine_crash_shutdown(struct pt_regs *regs)
143 {
144         local_irq_disable();
145         crash_smp_send_stop();
146 
147         crash_save_cpu(regs, smp_processor_id());
148         machine_kexec_mask_interrupts();
149 
150         pr_info("Loading crashdump kernel...\n");
151 }
152 
153 /*
154  * Function pointer to optional machine-specific reinitialization
155  */
156 void (*kexec_reinit)(void);
157 
158 void machine_kexec(struct kimage *image)
159 {
160         unsigned long page_list, reboot_entry_phys;
161         void (*reboot_entry)(void);
162         void *reboot_code_buffer;
163 
164         /*
165          * This can only happen if machine_shutdown() failed to disable some
166          * CPU, and that can only happen if the checks in
167          * machine_kexec_prepare() were not correct. If this fails, we can't
168          * reliably kexec anyway, so BUG_ON is appropriate.
169          */
170         BUG_ON(num_online_cpus() > 1);
171 
172         page_list = image->head & PAGE_MASK;
173 
174         reboot_code_buffer = page_address(image->control_code_page);
175 
176         /* Prepare parameters for reboot_code_buffer*/
177         set_kernel_text_rw();
178         kexec_start_address = image->start;
179         kexec_indirection_page = page_list;
180         kexec_mach_type = machine_arch_type;
181         kexec_boot_atags = image->arch.kernel_r2;
182 
183         /* copy our kernel relocation code to the control code page */
184         reboot_entry = fncpy(reboot_code_buffer,
185                              &relocate_new_kernel,
186                              relocate_new_kernel_size);
187 
188         /* get the identity mapping physical address for the reboot code */
189         reboot_entry_phys = virt_to_idmap(reboot_entry);
190 
191         pr_info("Bye!\n");
192 
193         if (kexec_reinit)
194                 kexec_reinit();
195 
196         soft_restart(reboot_entry_phys);
197 }
198 
199 void arch_crash_save_vmcoreinfo(void)
200 {
201 #ifdef CONFIG_ARM_LPAE
202         VMCOREINFO_CONFIG(ARM_LPAE);
203 #endif
204 }
205 

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