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Linux/arch/powerpc/kexec/core.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Code to handle transition of Linux booting another kernel.
  4  *
  5  * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
  6  * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
  7  * Copyright (C) 2005 IBM Corporation.
  8  */
  9 
 10 #include <linux/kexec.h>
 11 #include <linux/reboot.h>
 12 #include <linux/threads.h>
 13 #include <linux/memblock.h>
 14 #include <linux/of.h>
 15 #include <linux/irq.h>
 16 #include <linux/ftrace.h>
 17 
 18 #include <asm/kdump.h>
 19 #include <asm/machdep.h>
 20 #include <asm/pgalloc.h>
 21 #include <asm/prom.h>
 22 #include <asm/sections.h>
 23 
 24 void machine_kexec_mask_interrupts(void) {
 25         unsigned int i;
 26         struct irq_desc *desc;
 27 
 28         for_each_irq_desc(i, desc) {
 29                 struct irq_chip *chip;
 30 
 31                 chip = irq_desc_get_chip(desc);
 32                 if (!chip)
 33                         continue;
 34 
 35                 if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
 36                         chip->irq_eoi(&desc->irq_data);
 37 
 38                 if (chip->irq_mask)
 39                         chip->irq_mask(&desc->irq_data);
 40 
 41                 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
 42                         chip->irq_disable(&desc->irq_data);
 43         }
 44 }
 45 
 46 void machine_crash_shutdown(struct pt_regs *regs)
 47 {
 48         default_machine_crash_shutdown(regs);
 49 }
 50 
 51 /*
 52  * Do what every setup is needed on image and the
 53  * reboot code buffer to allow us to avoid allocations
 54  * later.
 55  */
 56 int machine_kexec_prepare(struct kimage *image)
 57 {
 58         if (ppc_md.machine_kexec_prepare)
 59                 return ppc_md.machine_kexec_prepare(image);
 60         else
 61                 return default_machine_kexec_prepare(image);
 62 }
 63 
 64 void machine_kexec_cleanup(struct kimage *image)
 65 {
 66 }
 67 
 68 void arch_crash_save_vmcoreinfo(void)
 69 {
 70 
 71 #ifdef CONFIG_NEED_MULTIPLE_NODES
 72         VMCOREINFO_SYMBOL(node_data);
 73         VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
 74 #endif
 75 #ifndef CONFIG_NEED_MULTIPLE_NODES
 76         VMCOREINFO_SYMBOL(contig_page_data);
 77 #endif
 78 #if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
 79         VMCOREINFO_SYMBOL(vmemmap_list);
 80         VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
 81         VMCOREINFO_SYMBOL(mmu_psize_defs);
 82         VMCOREINFO_STRUCT_SIZE(vmemmap_backing);
 83         VMCOREINFO_OFFSET(vmemmap_backing, list);
 84         VMCOREINFO_OFFSET(vmemmap_backing, phys);
 85         VMCOREINFO_OFFSET(vmemmap_backing, virt_addr);
 86         VMCOREINFO_STRUCT_SIZE(mmu_psize_def);
 87         VMCOREINFO_OFFSET(mmu_psize_def, shift);
 88 #endif
 89         vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset());
 90 }
 91 
 92 /*
 93  * Do not allocate memory (or fail in any way) in machine_kexec().
 94  * We are past the point of no return, committed to rebooting now.
 95  */
 96 void machine_kexec(struct kimage *image)
 97 {
 98         int save_ftrace_enabled;
 99 
100         save_ftrace_enabled = __ftrace_enabled_save();
101         this_cpu_disable_ftrace();
102 
103         if (ppc_md.machine_kexec)
104                 ppc_md.machine_kexec(image);
105         else
106                 default_machine_kexec(image);
107 
108         this_cpu_enable_ftrace();
109         __ftrace_enabled_restore(save_ftrace_enabled);
110 
111         /* Fall back to normal restart if we're still alive. */
112         machine_restart(NULL);
113         for(;;);
114 }
115 
116 void __init reserve_crashkernel(void)
117 {
118         unsigned long long crash_size, crash_base, total_mem_sz;
119         int ret;
120 
121         total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size();
122         /* use common parsing */
123         ret = parse_crashkernel(boot_command_line, total_mem_sz,
124                         &crash_size, &crash_base);
125         if (ret == 0 && crash_size > 0) {
126                 crashk_res.start = crash_base;
127                 crashk_res.end = crash_base + crash_size - 1;
128         }
129 
130         if (crashk_res.end == crashk_res.start) {
131                 crashk_res.start = crashk_res.end = 0;
132                 return;
133         }
134 
135         /* We might have got these values via the command line or the
136          * device tree, either way sanitise them now. */
137 
138         crash_size = resource_size(&crashk_res);
139 
140 #ifndef CONFIG_NONSTATIC_KERNEL
141         if (crashk_res.start != KDUMP_KERNELBASE)
142                 printk("Crash kernel location must be 0x%x\n",
143                                 KDUMP_KERNELBASE);
144 
145         crashk_res.start = KDUMP_KERNELBASE;
146 #else
147         if (!crashk_res.start) {
148 #ifdef CONFIG_PPC64
149                 /*
150                  * On 64bit we split the RMO in half but cap it at half of
151                  * a small SLB (128MB) since the crash kernel needs to place
152                  * itself and some stacks to be in the first segment.
153                  */
154                 crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
155 #else
156                 crashk_res.start = KDUMP_KERNELBASE;
157 #endif
158         }
159 
160         crash_base = PAGE_ALIGN(crashk_res.start);
161         if (crash_base != crashk_res.start) {
162                 printk("Crash kernel base must be aligned to 0x%lx\n",
163                                 PAGE_SIZE);
164                 crashk_res.start = crash_base;
165         }
166 
167 #endif
168         crash_size = PAGE_ALIGN(crash_size);
169         crashk_res.end = crashk_res.start + crash_size - 1;
170 
171         /* The crash region must not overlap the current kernel */
172         if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
173                 printk(KERN_WARNING
174                         "Crash kernel can not overlap current kernel\n");
175                 crashk_res.start = crashk_res.end = 0;
176                 return;
177         }
178 
179         /* Crash kernel trumps memory limit */
180         if (memory_limit && memory_limit <= crashk_res.end) {
181                 memory_limit = crashk_res.end + 1;
182                 total_mem_sz = memory_limit;
183                 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
184                        memory_limit);
185         }
186 
187         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
188                         "for crashkernel (System RAM: %ldMB)\n",
189                         (unsigned long)(crash_size >> 20),
190                         (unsigned long)(crashk_res.start >> 20),
191                         (unsigned long)(total_mem_sz >> 20));
192 
193         if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
194             memblock_reserve(crashk_res.start, crash_size)) {
195                 pr_err("Failed to reserve memory for crashkernel!\n");
196                 crashk_res.start = crashk_res.end = 0;
197                 return;
198         }
199 }
200 
201 int overlaps_crashkernel(unsigned long start, unsigned long size)
202 {
203         return (start + size) > crashk_res.start && start <= crashk_res.end;
204 }
205 
206 /* Values we need to export to the second kernel via the device tree. */
207 static phys_addr_t kernel_end;
208 static phys_addr_t crashk_base;
209 static phys_addr_t crashk_size;
210 static unsigned long long mem_limit;
211 
212 static struct property kernel_end_prop = {
213         .name = "linux,kernel-end",
214         .length = sizeof(phys_addr_t),
215         .value = &kernel_end,
216 };
217 
218 static struct property crashk_base_prop = {
219         .name = "linux,crashkernel-base",
220         .length = sizeof(phys_addr_t),
221         .value = &crashk_base
222 };
223 
224 static struct property crashk_size_prop = {
225         .name = "linux,crashkernel-size",
226         .length = sizeof(phys_addr_t),
227         .value = &crashk_size,
228 };
229 
230 static struct property memory_limit_prop = {
231         .name = "linux,memory-limit",
232         .length = sizeof(unsigned long long),
233         .value = &mem_limit,
234 };
235 
236 #define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
237 
238 static void __init export_crashk_values(struct device_node *node)
239 {
240         /* There might be existing crash kernel properties, but we can't
241          * be sure what's in them, so remove them. */
242         of_remove_property(node, of_find_property(node,
243                                 "linux,crashkernel-base", NULL));
244         of_remove_property(node, of_find_property(node,
245                                 "linux,crashkernel-size", NULL));
246 
247         if (crashk_res.start != 0) {
248                 crashk_base = cpu_to_be_ulong(crashk_res.start),
249                 of_add_property(node, &crashk_base_prop);
250                 crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
251                 of_add_property(node, &crashk_size_prop);
252         }
253 
254         /*
255          * memory_limit is required by the kexec-tools to limit the
256          * crash regions to the actual memory used.
257          */
258         mem_limit = cpu_to_be_ulong(memory_limit);
259         of_update_property(node, &memory_limit_prop);
260 }
261 
262 static int __init kexec_setup(void)
263 {
264         struct device_node *node;
265 
266         node = of_find_node_by_path("/chosen");
267         if (!node)
268                 return -ENOENT;
269 
270         /* remove any stale properties so ours can be found */
271         of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL));
272 
273         /* information needed by userspace when using default_machine_kexec */
274         kernel_end = cpu_to_be_ulong(__pa(_end));
275         of_add_property(node, &kernel_end_prop);
276 
277         export_crashk_values(node);
278 
279         of_node_put(node);
280         return 0;
281 }
282 late_initcall(kexec_setup);
283 

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