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Linux/arch/powerpc/kernel/machine_kexec.c

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  1 /*
  2  * Code to handle transition of Linux booting another kernel.
  3  *
  4  * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
  5  * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
  6  * Copyright (C) 2005 IBM Corporation.
  7  *
  8  * This source code is licensed under the GNU General Public License,
  9  * Version 2.  See the file COPYING for more details.
 10  */
 11 
 12 #include <linux/kexec.h>
 13 #include <linux/reboot.h>
 14 #include <linux/threads.h>
 15 #include <linux/memblock.h>
 16 #include <linux/of.h>
 17 #include <linux/irq.h>
 18 #include <linux/ftrace.h>
 19 
 20 #include <asm/machdep.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 }
 79 
 80 /*
 81  * Do not allocate memory (or fail in any way) in machine_kexec().
 82  * We are past the point of no return, committed to rebooting now.
 83  */
 84 void machine_kexec(struct kimage *image)
 85 {
 86         int save_ftrace_enabled;
 87 
 88         save_ftrace_enabled = __ftrace_enabled_save();
 89 
 90         if (ppc_md.machine_kexec)
 91                 ppc_md.machine_kexec(image);
 92         else
 93                 default_machine_kexec(image);
 94 
 95         __ftrace_enabled_restore(save_ftrace_enabled);
 96 
 97         /* Fall back to normal restart if we're still alive. */
 98         machine_restart(NULL);
 99         for(;;);
100 }
101 
102 void __init reserve_crashkernel(void)
103 {
104         unsigned long long crash_size, crash_base;
105         int ret;
106 
107         /* use common parsing */
108         ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
109                         &crash_size, &crash_base);
110         if (ret == 0 && crash_size > 0) {
111                 crashk_res.start = crash_base;
112                 crashk_res.end = crash_base + crash_size - 1;
113         }
114 
115         if (crashk_res.end == crashk_res.start) {
116                 crashk_res.start = crashk_res.end = 0;
117                 return;
118         }
119 
120         /* We might have got these values via the command line or the
121          * device tree, either way sanitise them now. */
122 
123         crash_size = resource_size(&crashk_res);
124 
125 #ifndef CONFIG_NONSTATIC_KERNEL
126         if (crashk_res.start != KDUMP_KERNELBASE)
127                 printk("Crash kernel location must be 0x%x\n",
128                                 KDUMP_KERNELBASE);
129 
130         crashk_res.start = KDUMP_KERNELBASE;
131 #else
132         if (!crashk_res.start) {
133 #ifdef CONFIG_PPC64
134                 /*
135                  * On 64bit we split the RMO in half but cap it at half of
136                  * a small SLB (128MB) since the crash kernel needs to place
137                  * itself and some stacks to be in the first segment.
138                  */
139                 crashk_res.start = min(0x80000000ULL, (ppc64_rma_size / 2));
140 #else
141                 crashk_res.start = KDUMP_KERNELBASE;
142 #endif
143         }
144 
145         crash_base = PAGE_ALIGN(crashk_res.start);
146         if (crash_base != crashk_res.start) {
147                 printk("Crash kernel base must be aligned to 0x%lx\n",
148                                 PAGE_SIZE);
149                 crashk_res.start = crash_base;
150         }
151 
152 #endif
153         crash_size = PAGE_ALIGN(crash_size);
154         crashk_res.end = crashk_res.start + crash_size - 1;
155 
156         /* The crash region must not overlap the current kernel */
157         if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
158                 printk(KERN_WARNING
159                         "Crash kernel can not overlap current kernel\n");
160                 crashk_res.start = crashk_res.end = 0;
161                 return;
162         }
163 
164         /* Crash kernel trumps memory limit */
165         if (memory_limit && memory_limit <= crashk_res.end) {
166                 memory_limit = crashk_res.end + 1;
167                 printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
168                        memory_limit);
169         }
170 
171         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
172                         "for crashkernel (System RAM: %ldMB)\n",
173                         (unsigned long)(crash_size >> 20),
174                         (unsigned long)(crashk_res.start >> 20),
175                         (unsigned long)(memblock_phys_mem_size() >> 20));
176 
177         memblock_reserve(crashk_res.start, crash_size);
178 }
179 
180 int overlaps_crashkernel(unsigned long start, unsigned long size)
181 {
182         return (start + size) > crashk_res.start && start <= crashk_res.end;
183 }
184 
185 /* Values we need to export to the second kernel via the device tree. */
186 static phys_addr_t kernel_end;
187 static phys_addr_t crashk_size;
188 
189 static struct property kernel_end_prop = {
190         .name = "linux,kernel-end",
191         .length = sizeof(phys_addr_t),
192         .value = &kernel_end,
193 };
194 
195 static struct property crashk_base_prop = {
196         .name = "linux,crashkernel-base",
197         .length = sizeof(phys_addr_t),
198         .value = &crashk_res.start,
199 };
200 
201 static struct property crashk_size_prop = {
202         .name = "linux,crashkernel-size",
203         .length = sizeof(phys_addr_t),
204         .value = &crashk_size,
205 };
206 
207 static struct property memory_limit_prop = {
208         .name = "linux,memory-limit",
209         .length = sizeof(unsigned long long),
210         .value = &memory_limit,
211 };
212 
213 static void __init export_crashk_values(struct device_node *node)
214 {
215         struct property *prop;
216 
217         /* There might be existing crash kernel properties, but we can't
218          * be sure what's in them, so remove them. */
219         prop = of_find_property(node, "linux,crashkernel-base", NULL);
220         if (prop)
221                 of_remove_property(node, prop);
222 
223         prop = of_find_property(node, "linux,crashkernel-size", NULL);
224         if (prop)
225                 of_remove_property(node, prop);
226 
227         if (crashk_res.start != 0) {
228                 of_add_property(node, &crashk_base_prop);
229                 crashk_size = resource_size(&crashk_res);
230                 of_add_property(node, &crashk_size_prop);
231         }
232 
233         /*
234          * memory_limit is required by the kexec-tools to limit the
235          * crash regions to the actual memory used.
236          */
237         of_update_property(node, &memory_limit_prop);
238 }
239 
240 static int __init kexec_setup(void)
241 {
242         struct device_node *node;
243         struct property *prop;
244 
245         node = of_find_node_by_path("/chosen");
246         if (!node)
247                 return -ENOENT;
248 
249         /* remove any stale properties so ours can be found */
250         prop = of_find_property(node, kernel_end_prop.name, NULL);
251         if (prop)
252                 of_remove_property(node, prop);
253 
254         /* information needed by userspace when using default_machine_kexec */
255         kernel_end = __pa(_end);
256         of_add_property(node, &kernel_end_prop);
257 
258         export_crashk_values(node);
259 
260         of_node_put(node);
261         return 0;
262 }
263 late_initcall(kexec_setup);
264 

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