Release 4.14 arch/powerpc/kernel/machine_kexec.c
/*
* Code to handle transition of Linux booting another kernel.
*
* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
* Copyright (C) 2005 IBM Corporation.
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#include <linux/kexec.h>
#include <linux/reboot.h>
#include <linux/threads.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/irq.h>
#include <linux/ftrace.h>
#include <asm/machdep.h>
#include <asm/pgalloc.h>
#include <asm/prom.h>
#include <asm/sections.h>
void machine_kexec_mask_interrupts(void) {
unsigned int i;
struct irq_desc *desc;
for_each_irq_desc(i, desc) {
struct irq_chip *chip;
chip = irq_desc_get_chip(desc);
if (!chip)
continue;
if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
chip->irq_eoi(&desc->irq_data);
if (chip->irq_mask)
chip->irq_mask(&desc->irq_data);
if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
chip->irq_disable(&desc->irq_data);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Matthew McClintock | 59 | 55.14% | 1 | 20.00% |
| Lennert Buytenhek | 31 | 28.97% | 1 | 20.00% |
| Thomas Gleixner | 11 | 10.28% | 2 | 40.00% |
| Grant C. Likely | 6 | 5.61% | 1 | 20.00% |
| Total | 107 | 100.00% | 5 | 100.00% |
void machine_crash_shutdown(struct pt_regs *regs)
{
default_machine_crash_shutdown(regs);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Ellerman | 10 | 66.67% | 1 | 50.00% |
| Anton Vorontsov | 5 | 33.33% | 1 | 50.00% |
| Total | 15 | 100.00% | 2 | 100.00% |
/*
* Do what every setup is needed on image and the
* reboot code buffer to allow us to avoid allocations
* later.
*/
int machine_kexec_prepare(struct kimage *image)
{
if (ppc_md.machine_kexec_prepare)
return ppc_md.machine_kexec_prepare(image);
else
return default_machine_kexec_prepare(image);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Ellerman | 26 | 83.87% | 1 | 50.00% |
| Anton Vorontsov | 5 | 16.13% | 1 | 50.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
void machine_kexec_cleanup(struct kimage *image)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Ellerman | 8 | 88.89% | 1 | 50.00% |
| Anton Blanchard | 1 | 11.11% | 1 | 50.00% |
| Total | 9 | 100.00% | 2 | 100.00% |
void arch_crash_save_vmcoreinfo(void)
{
#ifdef CONFIG_NEED_MULTIPLE_NODES
VMCOREINFO_SYMBOL(node_data);
VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
#endif
#ifndef CONFIG_NEED_MULTIPLE_NODES
VMCOREINFO_SYMBOL(contig_page_data);
#endif
#if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
VMCOREINFO_SYMBOL(vmemmap_list);
VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
VMCOREINFO_SYMBOL(mmu_psize_defs);
VMCOREINFO_STRUCT_SIZE(vmemmap_backing);
VMCOREINFO_OFFSET(vmemmap_backing, list);
VMCOREINFO_OFFSET(vmemmap_backing, phys);
VMCOREINFO_OFFSET(vmemmap_backing, virt_addr);
VMCOREINFO_STRUCT_SIZE(mmu_psize_def);
VMCOREINFO_OFFSET(mmu_psize_def, shift);
#endif
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hari Bathini | 66 | 66.00% | 1 | 50.00% |
| Neil Horman | 34 | 34.00% | 1 | 50.00% |
| Total | 100 | 100.00% | 2 | 100.00% |
/*
* Do not allocate memory (or fail in any way) in machine_kexec().
* We are past the point of no return, committed to rebooting now.
*/
void machine_kexec(struct kimage *image)
{
int save_ftrace_enabled;
save_ftrace_enabled = __ftrace_enabled_save();
if (ppc_md.machine_kexec)
ppc_md.machine_kexec(image);
else
default_machine_kexec(image);
__ftrace_enabled_restore(save_ftrace_enabled);
/* Fall back to normal restart if we're still alive. */
machine_restart(NULL);
for(;;);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Anton Blanchard | 27 | 50.00% | 2 | 50.00% |
| Michael Ellerman | 21 | 38.89% | 1 | 25.00% |
| Anton Vorontsov | 6 | 11.11% | 1 | 25.00% |
| Total | 54 | 100.00% | 4 | 100.00% |
void __init reserve_crashkernel(void)
{
unsigned long long crash_size, crash_base;
int ret;
/* use common parsing */
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
&crash_size, &crash_base);
if (ret == 0 && crash_size > 0) {
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
}
if (crashk_res.end == crashk_res.start) {
crashk_res.start = crashk_res.end = 0;
return;
}
/* We might have got these values via the command line or the
* device tree, either way sanitise them now. */
crash_size = resource_size(&crashk_res);
#ifndef CONFIG_NONSTATIC_KERNEL
if (crashk_res.start != KDUMP_KERNELBASE)
printk("Crash kernel location must be 0x%x\n",
KDUMP_KERNELBASE);
crashk_res.start = KDUMP_KERNELBASE;
#else
if (!crashk_res.start) {
#ifdef CONFIG_PPC64
/*
* On 64bit we split the RMO in half but cap it at half of
* a small SLB (128MB) since the crash kernel needs to place
* itself and some stacks to be in the first segment.
*/
crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
#else
crashk_res.start = KDUMP_KERNELBASE;
#endif
}
crash_base = PAGE_ALIGN(crashk_res.start);
if (crash_base != crashk_res.start) {
printk("Crash kernel base must be aligned to 0x%lx\n",
PAGE_SIZE);
crashk_res.start = crash_base;
}
#endif
crash_size = PAGE_ALIGN(crash_size);
crashk_res.end = crashk_res.start + crash_size - 1;
/* The crash region must not overlap the current kernel */
if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
printk(KERN_WARNING
"Crash kernel can not overlap current kernel\n");
crashk_res.start = crashk_res.end = 0;
return;
}
/* Crash kernel trumps memory limit */
if (memory_limit && memory_limit <= crashk_res.end) {
memory_limit = crashk_res.end + 1;
printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
memory_limit);
}
printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
"for crashkernel (System RAM: %ldMB)\n",
(unsigned long)(crash_size >> 20),
(unsigned long)(crashk_res.start >> 20),
(unsigned long)(memblock_phys_mem_size() >> 20));
memblock_reserve(crashk_res.start, crash_size);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Ellerman | 127 | 39.32% | 2 | 18.18% |
| Milton D. Miller II | 83 | 25.70% | 1 | 9.09% |
| Bernhard Walle | 77 | 23.84% | 1 | 9.09% |
| Anton Blanchard | 22 | 6.81% | 1 | 9.09% |
| M. Mohan Kumar | 4 | 1.24% | 1 | 9.09% |
| Joe Perches | 4 | 1.24% | 1 | 9.09% |
| Yinghai Lu | 3 | 0.93% | 1 | 9.09% |
| Mahesh Salgaonkar | 1 | 0.31% | 1 | 9.09% |
| Suzuki K. Poulose | 1 | 0.31% | 1 | 9.09% |
| Becky Bruce | 1 | 0.31% | 1 | 9.09% |
| Total | 323 | 100.00% | 11 | 100.00% |
int overlaps_crashkernel(unsigned long start, unsigned long size)
{
return (start + size) > crashk_res.start && start <= crashk_res.end;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Ellerman | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
/* Values we need to export to the second kernel via the device tree. */
static phys_addr_t kernel_end;
static phys_addr_t crashk_base;
static phys_addr_t crashk_size;
static unsigned long long mem_limit;
static struct property kernel_end_prop = {
.name = "linux,kernel-end",
.length = sizeof(phys_addr_t),
.value = &kernel_end,
};
static struct property crashk_base_prop = {
.name = "linux,crashkernel-base",
.length = sizeof(phys_addr_t),
.value = &crashk_base
};
static struct property crashk_size_prop = {
.name = "linux,crashkernel-size",
.length = sizeof(phys_addr_t),
.value = &crashk_size,
};
static struct property memory_limit_prop = {
.name = "linux,memory-limit",
.length = sizeof(unsigned long long),
.value = &mem_limit,
};
#define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
static void __init export_crashk_values(struct device_node *node)
{
/* There might be existing crash kernel properties, but we can't
* be sure what's in them, so remove them. */
of_remove_property(node, of_find_property(node,
"linux,crashkernel-base", NULL));
of_remove_property(node, of_find_property(node,
"linux,crashkernel-size", NULL));
if (crashk_res.start != 0) {
crashk_base = cpu_to_be_ulong(crashk_res.start),
of_add_property(node, &crashk_base_prop);
crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
of_add_property(node, &crashk_size_prop);
}
/*
* memory_limit is required by the kexec-tools to limit the
* crash regions to the actual memory used.
*/
mem_limit = cpu_to_be_ulong(memory_limit);
of_update_property(node, &memory_limit_prop);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 63 | 61.17% | 1 | 16.67% |
| Anton Blanchard | 19 | 18.45% | 1 | 16.67% |
| Suzuki K. Poulose | 8 | 7.77% | 1 | 16.67% |
| Suraj Jitindar Singh | 5 | 4.85% | 1 | 16.67% |
| Nathan Fontenot | 4 | 3.88% | 1 | 16.67% |
| Joe Perches | 4 | 3.88% | 1 | 16.67% |
| Total | 103 | 100.00% | 6 | 100.00% |
static int __init kexec_setup(void)
{
struct device_node *node;
node = of_find_node_by_path("/chosen");
if (!node)
return -ENOENT;
/* remove any stale properties so ours can be found */
of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL));
/* information needed by userspace when using default_machine_kexec */
kernel_end = cpu_to_be_ulong(__pa(_end));
of_add_property(node, &kernel_end_prop);
export_crashk_values(node);
of_node_put(node);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 71 | 89.87% | 2 | 40.00% |
| Suraj Jitindar Singh | 4 | 5.06% | 1 | 20.00% |
| Anton Blanchard | 3 | 3.80% | 1 | 20.00% |
| Nathan Fontenot | 1 | 1.27% | 1 | 20.00% |
| Total | 79 | 100.00% | 5 | 100.00% |
late_initcall(kexec_setup);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Ellerman | 239 | 23.41% | 3 | 9.68% |
| Dale Farnsworth | 216 | 21.16% | 2 | 6.45% |
| Anton Blanchard | 92 | 9.01% | 5 | 16.13% |
| Milton D. Miller II | 83 | 8.13% | 1 | 3.23% |
| Bernhard Walle | 77 | 7.54% | 1 | 3.23% |
| Matthew McClintock | 76 | 7.44% | 2 | 6.45% |
| Hari Bathini | 69 | 6.76% | 1 | 3.23% |
| Suzuki K. Poulose | 36 | 3.53% | 2 | 6.45% |
| Neil Horman | 34 | 3.33% | 1 | 3.23% |
| Lennert Buytenhek | 31 | 3.04% | 1 | 3.23% |
| Anton Vorontsov | 16 | 1.57% | 1 | 3.23% |
| Thomas Gleixner | 11 | 1.08% | 2 | 6.45% |
| Suraj Jitindar Singh | 9 | 0.88% | 1 | 3.23% |
| Joe Perches | 8 | 0.78% | 1 | 3.23% |
| Grant C. Likely | 6 | 0.59% | 1 | 3.23% |
| Nathan Fontenot | 5 | 0.49% | 1 | 3.23% |
| M. Mohan Kumar | 4 | 0.39% | 1 | 3.23% |
| Yinghai Lu | 4 | 0.39% | 1 | 3.23% |
| David S. Miller | 3 | 0.29% | 1 | 3.23% |
| Becky Bruce | 1 | 0.10% | 1 | 3.23% |
| Mahesh Salgaonkar | 1 | 0.10% | 1 | 3.23% |
| Total | 1021 | 100.00% | 31 | 100.00% |
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