#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/kexec.h>
-#include <linux/spinlock.h>
+#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/highmem.h>
#include <linux/syscalls.h>
#include <linux/hardirq.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
-#include <linux/utsrelease.h>
+#include <generated/utsrelease.h>
#include <linux/utsname.h>
#include <linux/numa.h>
#include <linux/suspend.h>
#include <linux/pm.h>
#include <linux/cpu.h>
#include <linux/console.h>
+#include <linux/vmalloc.h>
+#include <linux/swap.h>
+#include <linux/kmsg_dump.h>
+#include <linux/syscore_ops.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include <asm/sections.h>
/* Per cpu memory for storing cpu states in case of system crash. */
-note_buf_t* crash_notes;
+note_buf_t __percpu *crash_notes;
/* vmcoreinfo stuff */
-unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
+static unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
size_t vmcoreinfo_size;
size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
*
* The code for the transition from the current kernel to the
* the new kernel is placed in the control_code_buffer, whose size
- * is given by KEXEC_CONTROL_CODE_SIZE. In the best case only a single
+ * is given by KEXEC_CONTROL_PAGE_SIZE. In the best case only a single
* page of memory is necessary, but some architectures require more.
* Because this memory must be identity mapped in the transition from
* virtual to physical addresses it must live in the range
/* Initialize the list of destination pages */
INIT_LIST_HEAD(&image->dest_pages);
- /* Initialize the list of unuseable pages */
+ /* Initialize the list of unusable pages */
INIT_LIST_HEAD(&image->unuseable_pages);
/* Read in the segments */
image->nr_segments = nr_segments;
segment_bytes = nr_segments * sizeof(*segments);
result = copy_from_user(image->segment, segments, segment_bytes);
- if (result)
+ if (result) {
+ result = -EFAULT;
goto out;
+ }
/*
* Verify we have good destination addresses. The caller is
* just verifies it is an address we can use.
*
* Since the kernel does everything in page size chunks ensure
- * the destination addreses are page aligned. Too many
+ * the destination addresses are page aligned. Too many
* special cases crop of when we don't do this. The most
* insidious is getting overlapping destination addresses
* simply because addresses are changed to page size
*/
result = -ENOMEM;
image->control_code_page = kimage_alloc_control_pages(image,
- get_order(KEXEC_CONTROL_CODE_SIZE));
+ get_order(KEXEC_CONTROL_PAGE_SIZE));
if (!image->control_code_page) {
printk(KERN_ERR "Could not allocate control_code_buffer\n");
goto out;
*/
result = -ENOMEM;
image->control_code_page = kimage_alloc_control_pages(image,
- get_order(KEXEC_CONTROL_CODE_SIZE));
+ get_order(KEXEC_CONTROL_PAGE_SIZE));
if (!image->control_code_page) {
printk(KERN_ERR "Could not allocate control_code_buffer\n");
goto out;
/* Deal with the destination pages I have inadvertently allocated.
*
* Ideally I would convert multi-page allocations into single
- * page allocations, and add everyting to image->dest_pages.
+ * page allocations, and add everything to image->dest_pages.
*
* For now it is simpler to just free the pages.
*/
/* Walk through and free any extra destination pages I may have */
kimage_free_page_list(&image->dest_pages);
- /* Walk through and free any unuseable pages I have cached */
+ /* Walk through and free any unusable pages I have cached */
kimage_free_page_list(&image->unuseable_pages);
}
*old = addr | (*old & ~PAGE_MASK);
/* The old page I have found cannot be a
- * destination page, so return it.
+ * destination page, so return it if it's
+ * gfp_flags honor the ones passed in.
*/
+ if (!(gfp_mask & __GFP_HIGHMEM) &&
+ PageHighMem(old_page)) {
+ kimage_free_pages(old_page);
+ continue;
+ }
addr = old_addr;
page = old_page;
break;
ptr = kmap(page);
/* Start with a clear page */
- memset(ptr, 0, PAGE_SIZE);
+ clear_page(ptr);
ptr += maddr & ~PAGE_MASK;
mchunk = PAGE_SIZE - (maddr & ~PAGE_MASK);
if (mchunk > mbytes)
result = copy_from_user(ptr, buf, uchunk);
kunmap(page);
if (result) {
- result = (result < 0) ? result : -EIO;
+ result = -EFAULT;
goto out;
}
ubytes -= uchunk;
kexec_flush_icache_page(page);
kunmap(page);
if (result) {
- result = (result < 0) ? result : -EIO;
+ result = -EFAULT;
goto out;
}
ubytes -= uchunk;
*/
struct kimage *kexec_image;
struct kimage *kexec_crash_image;
-/*
- * A home grown binary mutex.
- * Nothing can wait so this mutex is safe to use
- * in interrupt context :)
- */
-static int kexec_lock;
-asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
- struct kexec_segment __user *segments,
- unsigned long flags)
+static DEFINE_MUTEX(kexec_mutex);
+
+SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
+ struct kexec_segment __user *, segments, unsigned long, flags)
{
struct kimage **dest_image, *image;
- int locked;
int result;
/* We only trust the superuser with rebooting the system. */
*
* KISS: always take the mutex.
*/
- locked = xchg(&kexec_lock, 1);
- if (locked)
+ if (!mutex_trylock(&kexec_mutex))
return -EBUSY;
dest_image = &kexec_image;
image = xchg(dest_image, image);
out:
- locked = xchg(&kexec_lock, 0); /* Release the mutex */
- BUG_ON(!locked);
+ mutex_unlock(&kexec_mutex);
kimage_free(image);
return result;
void crash_kexec(struct pt_regs *regs)
{
- int locked;
-
-
- /* Take the kexec_lock here to prevent sys_kexec_load
+ /* Take the kexec_mutex here to prevent sys_kexec_load
* running on one cpu from replacing the crash kernel
* we are using after a panic on a different cpu.
*
* of memory the xchg(&kexec_crash_image) would be
* sufficient. But since I reuse the memory...
*/
- locked = xchg(&kexec_lock, 1);
- if (!locked) {
+ if (mutex_trylock(&kexec_mutex)) {
if (kexec_crash_image) {
struct pt_regs fixed_regs;
+
+ kmsg_dump(KMSG_DUMP_KEXEC);
+
crash_setup_regs(&fixed_regs, regs);
crash_save_vmcoreinfo();
machine_crash_shutdown(&fixed_regs);
machine_kexec(kexec_crash_image);
}
- locked = xchg(&kexec_lock, 0);
- BUG_ON(!locked);
+ mutex_unlock(&kexec_mutex);
}
}
+size_t crash_get_memory_size(void)
+{
+ size_t size = 0;
+ mutex_lock(&kexec_mutex);
+ if (crashk_res.end != crashk_res.start)
+ size = resource_size(&crashk_res);
+ mutex_unlock(&kexec_mutex);
+ return size;
+}
+
+void __weak crash_free_reserved_phys_range(unsigned long begin,
+ unsigned long end)
+{
+ unsigned long addr;
+
+ for (addr = begin; addr < end; addr += PAGE_SIZE) {
+ ClearPageReserved(pfn_to_page(addr >> PAGE_SHIFT));
+ init_page_count(pfn_to_page(addr >> PAGE_SHIFT));
+ free_page((unsigned long)__va(addr));
+ totalram_pages++;
+ }
+}
+
+int crash_shrink_memory(unsigned long new_size)
+{
+ int ret = 0;
+ unsigned long start, end;
+
+ mutex_lock(&kexec_mutex);
+
+ if (kexec_crash_image) {
+ ret = -ENOENT;
+ goto unlock;
+ }
+ start = crashk_res.start;
+ end = crashk_res.end;
+
+ if (new_size >= end - start + 1) {
+ ret = -EINVAL;
+ if (new_size == end - start + 1)
+ ret = 0;
+ goto unlock;
+ }
+
+ start = roundup(start, PAGE_SIZE);
+ end = roundup(start + new_size, PAGE_SIZE);
+
+ crash_free_reserved_phys_range(end, crashk_res.end);
+
+ if ((start == end) && (crashk_res.parent != NULL))
+ release_resource(&crashk_res);
+ crashk_res.end = end - 1;
+
+unlock:
+ mutex_unlock(&kexec_mutex);
+ return ret;
+}
+
static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data,
size_t data_len)
{
struct elf_prstatus prstatus;
u32 *buf;
- if ((cpu < 0) || (cpu >= NR_CPUS))
+ if ((cpu < 0) || (cpu >= nr_cpu_ids))
return;
/* Using ELF notes here is opportunistic.
return;
memset(&prstatus, 0, sizeof(prstatus));
prstatus.pr_pid = current->pid;
- elf_core_copy_regs(&prstatus.pr_reg, regs);
+ elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);
buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
&prstatus, sizeof(prstatus));
final_note(buf);
} while (*cur++ == ',');
if (*crash_size > 0) {
- while (*cur != ' ' && *cur != '@')
+ while (*cur && *cur != ' ' && *cur != '@')
cur++;
if (*cur == '@') {
cur++;
VMCOREINFO_SYMBOL(node_online_map);
VMCOREINFO_SYMBOL(swapper_pg_dir);
VMCOREINFO_SYMBOL(_stext);
+ VMCOREINFO_SYMBOL(vmlist);
#ifndef CONFIG_NEED_MULTIPLE_NODES
VMCOREINFO_SYMBOL(mem_map);
VMCOREINFO_OFFSET(free_area, free_list);
VMCOREINFO_OFFSET(list_head, next);
VMCOREINFO_OFFSET(list_head, prev);
+ VMCOREINFO_OFFSET(vm_struct, addr);
VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
+ log_buf_kexec_setup();
VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
VMCOREINFO_NUMBER(NR_FREE_PAGES);
VMCOREINFO_NUMBER(PG_lru);
{
int error = 0;
- if (xchg(&kexec_lock, 1))
+ if (!mutex_trylock(&kexec_mutex))
return -EBUSY;
if (!kexec_image) {
error = -EINVAL;
goto Restore_console;
}
suspend_console();
- error = device_suspend(PMSG_FREEZE);
+ error = dpm_suspend_start(PMSG_FREEZE);
if (error)
goto Resume_console;
- error = disable_nonboot_cpus();
- if (error)
- goto Resume_devices;
- local_irq_disable();
- /* At this point, device_suspend() has been called,
- * but *not* device_power_down(). We *must*
- * device_power_down() now. Otherwise, drivers for
+ /* At this point, dpm_suspend_start() has been called,
+ * but *not* dpm_suspend_noirq(). We *must* call
+ * dpm_suspend_noirq() now. Otherwise, drivers for
* some devices (e.g. interrupt controllers) become
* desynchronized with the actual state of the
* hardware at resume time, and evil weirdness ensues.
*/
- error = device_power_down(PMSG_FREEZE);
+ error = dpm_suspend_noirq(PMSG_FREEZE);
+ if (error)
+ goto Resume_devices;
+ error = disable_nonboot_cpus();
+ if (error)
+ goto Enable_cpus;
+ local_irq_disable();
+ error = syscore_suspend();
if (error)
goto Enable_irqs;
- save_processor_state();
} else
#endif
{
- blocking_notifier_call_chain(&reboot_notifier_list,
- SYS_RESTART, NULL);
- system_state = SYSTEM_RESTART;
- device_shutdown();
- sysdev_shutdown();
+ kernel_restart_prepare(NULL);
printk(KERN_EMERG "Starting new kernel\n");
machine_shutdown();
}
#ifdef CONFIG_KEXEC_JUMP
if (kexec_image->preserve_context) {
- restore_processor_state();
- device_power_up(PMSG_RESTORE);
+ syscore_resume();
Enable_irqs:
local_irq_enable();
+ Enable_cpus:
enable_nonboot_cpus();
+ dpm_resume_noirq(PMSG_RESTORE);
Resume_devices:
- device_resume(PMSG_RESTORE);
+ dpm_resume_end(PMSG_RESTORE);
Resume_console:
resume_console();
thaw_processes();
#endif
Unlock:
- if (!xchg(&kexec_lock, 0))
- BUG();
-
+ mutex_unlock(&kexec_mutex);
return error;
}
Code Review / linux-2.6.git / blobdiff