X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fkexec.c;h=fbffdb457cce0e6f44cbef31285ec9de3e68f686;hb=425fb2b4bf5dde24be4a82e9a2c344bb49ac92e4;hp=2a59c8a01ae0010da5ef5b80b39fad2ec1da14ae;hpb=11c302c14d8ddc47504bd3b650bc9e8da7c717b7;p=linux-2.6

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 2a59c8a01a..fbffdb457c 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -17,21 +17,30 @@
 #include <linux/highmem.h>
 #include <linux/syscalls.h>
 #include <linux/reboot.h>
-#include <linux/syscalls.h>
 #include <linux/ioport.h>
 #include <linux/hardirq.h>
 #include <linux/elf.h>
 #include <linux/elfcore.h>
+#include <linux/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/numa.h>
 
 #include <asm/page.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/system.h>
 #include <asm/semaphore.h>
+#include <asm/sections.h>
 
 /* Per cpu memory for storing cpu states in case of system crash. */
 note_buf_t* crash_notes;
 
+/* vmcoreinfo stuff */
+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);
+
 /* Location of the reserved area for the crash kernel */
 struct resource crashk_res = {
 	.name  = "Crash kernel",
@@ -42,7 +51,7 @@ struct resource crashk_res = {
 
 int kexec_should_crash(struct task_struct *p)
 {
-	if (in_interrupt() || !p->pid || is_init(p) || panic_on_oops)
+	if (in_interrupt() || !p->pid || is_global_init(p) || panic_on_oops)
 		return 1;
 	return 0;
 }
@@ -776,7 +785,7 @@ static int kimage_load_normal_segment(struct kimage *image,
 		size_t uchunk, mchunk;
 
 		page = kimage_alloc_page(image, GFP_HIGHUSER, maddr);
-		if (page == 0) {
+		if (!page) {
 			result  = -ENOMEM;
 			goto out;
 		}
@@ -835,7 +844,7 @@ static int kimage_load_crash_segment(struct kimage *image,
 		size_t uchunk, mchunk;
 
 		page = pfn_to_page(maddr >> PAGE_SHIFT);
-		if (page == 0) {
+		if (!page) {
 			result  = -ENOMEM;
 			goto out;
 		}
@@ -1061,6 +1070,7 @@ void crash_kexec(struct pt_regs *regs)
 		if (kexec_crash_image) {
 			struct pt_regs fixed_regs;
 			crash_setup_regs(&fixed_regs, regs);
+			crash_save_vmcoreinfo();
 			machine_crash_shutdown(&fixed_regs);
 			machine_kexec(kexec_crash_image);
 		}
@@ -1118,8 +1128,8 @@ void crash_save_cpu(struct pt_regs *regs, int cpu)
 	memset(&prstatus, 0, sizeof(prstatus));
 	prstatus.pr_pid = current->pid;
 	elf_core_copy_regs(&prstatus.pr_reg, regs);
-	buf = append_elf_note(buf, "CORE", NT_PRSTATUS, &prstatus,
-				sizeof(prstatus));
+	buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
+		      	      &prstatus, sizeof(prstatus));
 	final_note(buf);
 }
 
@@ -1135,3 +1145,104 @@ static int __init crash_notes_memory_init(void)
 	return 0;
 }
 module_init(crash_notes_memory_init)
+
+void crash_save_vmcoreinfo(void)
+{
+	u32 *buf;
+
+	if (!vmcoreinfo_size)
+		return;
+
+	vmcoreinfo_append_str("CRASHTIME=%ld", get_seconds());
+
+	buf = (u32 *)vmcoreinfo_note;
+
+	buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
+			      vmcoreinfo_size);
+
+	final_note(buf);
+}
+
+void vmcoreinfo_append_str(const char *fmt, ...)
+{
+	va_list args;
+	char buf[0x50];
+	int r;
+
+	va_start(args, fmt);
+	r = vsnprintf(buf, sizeof(buf), fmt, args);
+	va_end(args);
+
+	if (r + vmcoreinfo_size > vmcoreinfo_max_size)
+		r = vmcoreinfo_max_size - vmcoreinfo_size;
+
+	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
+
+	vmcoreinfo_size += r;
+}
+
+/*
+ * provide an empty default implementation here -- architecture
+ * code may override this
+ */
+void __attribute__ ((weak)) arch_crash_save_vmcoreinfo(void)
+{}
+
+unsigned long __attribute__ ((weak)) paddr_vmcoreinfo_note(void)
+{
+	return __pa((unsigned long)(char *)&vmcoreinfo_note);
+}
+
+static int __init crash_save_vmcoreinfo_init(void)
+{
+	vmcoreinfo_append_str("OSRELEASE=%s\n", init_uts_ns.name.release);
+	vmcoreinfo_append_str("PAGESIZE=%ld\n", PAGE_SIZE);
+
+	VMCOREINFO_SYMBOL(init_uts_ns);
+	VMCOREINFO_SYMBOL(node_online_map);
+	VMCOREINFO_SYMBOL(swapper_pg_dir);
+	VMCOREINFO_SYMBOL(_stext);
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+	VMCOREINFO_SYMBOL(mem_map);
+	VMCOREINFO_SYMBOL(contig_page_data);
+#endif
+#ifdef CONFIG_SPARSEMEM
+	VMCOREINFO_SYMBOL(mem_section);
+	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
+	VMCOREINFO_SIZE(mem_section);
+	VMCOREINFO_OFFSET(mem_section, section_mem_map);
+#endif
+	VMCOREINFO_SIZE(page);
+	VMCOREINFO_SIZE(pglist_data);
+	VMCOREINFO_SIZE(zone);
+	VMCOREINFO_SIZE(free_area);
+	VMCOREINFO_SIZE(list_head);
+	VMCOREINFO_TYPEDEF_SIZE(nodemask_t);
+	VMCOREINFO_OFFSET(page, flags);
+	VMCOREINFO_OFFSET(page, _count);
+	VMCOREINFO_OFFSET(page, mapping);
+	VMCOREINFO_OFFSET(page, lru);
+	VMCOREINFO_OFFSET(pglist_data, node_zones);
+	VMCOREINFO_OFFSET(pglist_data, nr_zones);
+#ifdef CONFIG_FLAT_NODE_MEM_MAP
+	VMCOREINFO_OFFSET(pglist_data, node_mem_map);
+#endif
+	VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
+	VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
+	VMCOREINFO_OFFSET(pglist_data, node_id);
+	VMCOREINFO_OFFSET(zone, free_area);
+	VMCOREINFO_OFFSET(zone, vm_stat);
+	VMCOREINFO_OFFSET(zone, spanned_pages);
+	VMCOREINFO_OFFSET(free_area, free_list);
+	VMCOREINFO_OFFSET(list_head, next);
+	VMCOREINFO_OFFSET(list_head, prev);
+	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
+	VMCOREINFO_NUMBER(NR_FREE_PAGES);
+
+	arch_crash_save_vmcoreinfo();
+
+	return 0;
+}
+
+module_init(crash_save_vmcoreinfo_init)