LinuxLists.cc - [PATCH v2 0/5] kexec/fadump: remove dependency with CONFIG_KEXEC and reuse crashkernel parameter for fadump

2016-11-25 11:54:06

Subject: [PATCH v2 0/5] kexec/fadump: remove dependency with CONFIG_KEXEC and reuse crashkernel parameter for fadump

2016-11-25 11:54:15

Subject: [PATCH v2 1/5] crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE

Traditionally, kdump is used to save vmcore in case of a crash. Some
architectures like powerpc can save vmcore using architecture specific
support instead of kexec/kdump mechanism. Such architecture specific
support also needs to reserve memory, to be used by dump capture kernel.
crashkernel parameter can be a reused, for memory reservation, by such
architecture specific infrastructure.

But currently, code related to vmcoreinfo and parsing of crashkernel
parameter is built under CONFIG_KEXEC_CORE. This patch introduces
CONFIG_CRASH_CORE and moves the above mentioned code under this config,
allowing code reuse without dependency on CONFIG_KEXEC. There is no
functional change with this patch.

Signed-off-by: Hari Bathini <[email protected]>
---
arch/Kconfig | 4
include/linux/crash_core.h | 71 +++++++
include/linux/kexec.h | 63 ------
kernel/Makefile | 1
kernel/crash_core.c | 450 ++++++++++++++++++++++++++++++++++++++++++++
kernel/kexec_core.c | 407 ----------------------------------------
6 files changed, 530 insertions(+), 466 deletions(-)
create mode 100644 include/linux/crash_core.h
create mode 100644 kernel/crash_core.c

diff --git a/arch/Kconfig b/arch/Kconfig
index 659bdd0..4ad34b9 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -2,7 +2,11 @@
# General architecture dependent options
#

+config CRASH_CORE
+ bool
+
config KEXEC_CORE
+ select CRASH_CORE
bool

config OPROFILE
diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
new file mode 100644
index 0000000..9a4f4b0
--- /dev/null
+++ b/include/linux/crash_core.h
@@ -0,0 +1,71 @@
+#ifndef LINUX_CRASH_CORE_H
+#define LINUX_CRASH_CORE_H
+
+#include <linux/linkage.h>
+#include <linux/elfcore.h>
+#include <linux/elf.h>
+
+#define CRASH_CORE_NOTE_NAME "CORE"
+#define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
+#define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(CRASH_CORE_NOTE_NAME), 4)
+#define CRASH_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
+
+#define CRASH_CORE_NOTE_BYTES ((CRASH_CORE_NOTE_HEAD_BYTES * 2) + \
+ CRASH_CORE_NOTE_NAME_BYTES + \
+ CRASH_CORE_NOTE_DESC_BYTES)
+
+#define VMCOREINFO_BYTES (4096)
+#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
+#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
+#define VMCOREINFO_NOTE_SIZE ((CRASH_CORE_NOTE_HEAD_BYTES * 2) + \
+ VMCOREINFO_NOTE_NAME_BYTES + \
+ VMCOREINFO_BYTES)
+
+typedef u32 note_buf_t[CRASH_CORE_NOTE_BYTES/4];
+
+void crash_save_vmcoreinfo(void);
+void arch_crash_save_vmcoreinfo(void);
+__printf(1, 2)
+void vmcoreinfo_append_str(const char *fmt, ...);
+phys_addr_t paddr_vmcoreinfo_note(void);
+
+#define VMCOREINFO_OSRELEASE(value) \
+ vmcoreinfo_append_str("OSRELEASE=%s\n", value)
+#define VMCOREINFO_PAGESIZE(value) \
+ vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
+#define VMCOREINFO_SYMBOL(name) \
+ vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
+#define VMCOREINFO_SIZE(name) \
+ vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
+ (unsigned long)sizeof(name))
+#define VMCOREINFO_STRUCT_SIZE(name) \
+ vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
+ (unsigned long)sizeof(struct name))
+#define VMCOREINFO_OFFSET(name, field) \
+ vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
+ (unsigned long)offsetof(struct name, field))
+#define VMCOREINFO_LENGTH(name, value) \
+ vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
+#define VMCOREINFO_NUMBER(name) \
+ vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
+#define VMCOREINFO_CONFIG(name) \
+ vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
+#define VMCOREINFO_PAGE_OFFSET(value) \
+ vmcoreinfo_append_str("PAGE_OFFSET=%lx\n", (unsigned long)value)
+#define VMCOREINFO_VMALLOC_START(value) \
+ vmcoreinfo_append_str("VMALLOC_START=%lx\n", (unsigned long)value)
+#define VMCOREINFO_VMEMMAP_START(value) \
+ vmcoreinfo_append_str("VMEMMAP_START=%lx\n", (unsigned long)value)
+
+extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
+extern size_t vmcoreinfo_size;
+extern size_t vmcoreinfo_max_size;
+
+int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
+ unsigned long long *crash_size, unsigned long long *crash_base);
+int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
+ unsigned long long *crash_size, unsigned long long *crash_base);
+int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
+ unsigned long long *crash_size, unsigned long long *crash_base);
+
+#endif /* LINUX_CRASH_CORE_H */
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 406c33d..aa3c747 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -14,17 +14,15 @@

#if !defined(__ASSEMBLY__)

+#include <linux/crash_core.h>
#include <asm/io.h>

#include <uapi/linux/kexec.h>

#ifdef CONFIG_KEXEC_CORE
#include <linux/list.h>
-#include <linux/linkage.h>
#include <linux/compat.h>
#include <linux/ioport.h>
-#include <linux/elfcore.h>
-#include <linux/elf.h>
#include <linux/module.h>
#include <asm/kexec.h>

@@ -62,19 +60,15 @@
#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
#endif

-#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
-#define KEXEC_CORE_NOTE_NAME "CORE"
-#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
-#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
+#define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
+
/*
* The per-cpu notes area is a list of notes terminated by a "NULL"
* note header. For kdump, the code in vmcore.c runs in the context
* of the second kernel to combine them into one note.
*/
#ifndef KEXEC_NOTE_BYTES
-#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
- KEXEC_CORE_NOTE_NAME_BYTES + \
- KEXEC_CORE_NOTE_DESC_BYTES )
+#define KEXEC_NOTE_BYTES CRASH_CORE_NOTE_BYTES
#endif

/*
@@ -232,39 +226,6 @@ extern void crash_kexec(struct pt_regs *);
int kexec_should_crash(struct task_struct *);
int kexec_crash_loaded(void);
void crash_save_cpu(struct pt_regs *regs, int cpu);
-void crash_save_vmcoreinfo(void);
-void arch_crash_save_vmcoreinfo(void);
-__printf(1, 2)
-void vmcoreinfo_append_str(const char *fmt, ...);
-phys_addr_t paddr_vmcoreinfo_note(void);
-
-#define VMCOREINFO_OSRELEASE(value) \
- vmcoreinfo_append_str("OSRELEASE=%s\n", value)
-#define VMCOREINFO_PAGESIZE(value) \
- vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
-#define VMCOREINFO_SYMBOL(name) \
- vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
-#define VMCOREINFO_SIZE(name) \
- vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
- (unsigned long)sizeof(name))
-#define VMCOREINFO_STRUCT_SIZE(name) \
- vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
- (unsigned long)sizeof(struct name))
-#define VMCOREINFO_OFFSET(name, field) \
- vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
- (unsigned long)offsetof(struct name, field))
-#define VMCOREINFO_LENGTH(name, value) \
- vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
-#define VMCOREINFO_NUMBER(name) \
- vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
-#define VMCOREINFO_CONFIG(name) \
- vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
-#define VMCOREINFO_PAGE_OFFSET(value) \
- vmcoreinfo_append_str("PAGE_OFFSET=%lx\n", (unsigned long)value)
-#define VMCOREINFO_VMALLOC_START(value) \
- vmcoreinfo_append_str("VMALLOC_START=%lx\n", (unsigned long)value)
-#define VMCOREINFO_VMEMMAP_START(value) \
- vmcoreinfo_append_str("VMEMMAP_START=%lx\n", (unsigned long)value)

extern struct kimage *kexec_image;
extern struct kimage *kexec_crash_image;
@@ -285,31 +246,15 @@ extern int kexec_load_disabled;
#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
KEXEC_FILE_NO_INITRAMFS)

-#define VMCOREINFO_BYTES (4096)
-#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
-#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
-#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
- + VMCOREINFO_NOTE_NAME_BYTES)
-
/* Location of a reserved region to hold the crash kernel.
*/
extern struct resource crashk_res;
extern struct resource crashk_low_res;
-typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
extern note_buf_t __percpu *crash_notes;
-extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
-extern size_t vmcoreinfo_size;
-extern size_t vmcoreinfo_max_size;

/* flag to track if kexec reboot is in progress */
extern bool kexec_in_progress;

-int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
- unsigned long long *crash_size, unsigned long long *crash_base);
-int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
- unsigned long long *crash_size, unsigned long long *crash_base);
-int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
- unsigned long long *crash_size, unsigned long long *crash_base);
int crash_shrink_memory(unsigned long new_size);
size_t crash_get_memory_size(void);
void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
diff --git a/kernel/Makefile b/kernel/Makefile
index eb26e12c..017e092 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -59,6 +59,7 @@ obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_MODULE_SIG) += module_signing.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
+obj-$(CONFIG_CRASH_CORE) += crash_core.o
obj-$(CONFIG_KEXEC_CORE) += kexec_core.o
obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_KEXEC_FILE) += kexec_file.o
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
new file mode 100644
index 0000000..60a98fc
--- /dev/null
+++ b/kernel/crash_core.c
@@ -0,0 +1,450 @@
+/*
+ * crash.c - kernel crash support code.
+ * Copyright (C) 2002-2004 Eric Biederman <[email protected]>
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/crash_core.h>
+#include <linux/utsname.h>
+#include <linux/vmalloc.h>
+
+#include <asm/page.h>
+#include <asm/sections.h>
+
+/* vmcoreinfo stuff */
+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);
+
+/*
+ * parsing the "crashkernel" commandline
+ *
+ * this code is intended to be called from architecture specific code
+ */
+
+
+/*
+ * This function parses command lines in the format
+ *
+ * crashkernel=ramsize-range:size[,...][@offset]
+ *
+ * The function returns 0 on success and -EINVAL on failure.
+ */
+static int __init parse_crashkernel_mem(char *cmdline,
+ unsigned long long system_ram,
+ unsigned long long *crash_size,
+ unsigned long long *crash_base)
+{
+ char *cur = cmdline, *tmp;
+
+ /* for each entry of the comma-separated list */
+ do {
+ unsigned long long start, end = ULLONG_MAX, size;
+
+ /* get the start of the range */
+ start = memparse(cur, &tmp);
+ if (cur == tmp) {
+ pr_warn("crashkernel: Memory value expected\n");
+ return -EINVAL;
+ }
+ cur = tmp;
+ if (*cur != '-') {
+ pr_warn("crashkernel: '-' expected\n");
+ return -EINVAL;
+ }
+ cur++;
+
+ /* if no ':' is here, than we read the end */
+ if (*cur != ':') {
+ end = memparse(cur, &tmp);
+ if (cur == tmp) {
+ pr_warn("crashkernel: Memory value expected\n");
+ return -EINVAL;
+ }
+ cur = tmp;
+ if (end <= start) {
+ pr_warn("crashkernel: end <= start\n");
+ return -EINVAL;
+ }
+ }
+
+ if (*cur != ':') {
+ pr_warn("crashkernel: ':' expected\n");
+ return -EINVAL;
+ }
+ cur++;
+
+ size = memparse(cur, &tmp);
+ if (cur == tmp) {
+ pr_warn("Memory value expected\n");
+ return -EINVAL;
+ }
+ cur = tmp;
+ if (size >= system_ram) {
+ pr_warn("crashkernel: invalid size\n");
+ return -EINVAL;
+ }
+
+ /* match ? */
+ if (system_ram >= start && system_ram < end) {
+ *crash_size = size;
+ break;
+ }
+ } while (*cur++ == ',');
+
+ if (*crash_size > 0) {
+ while (*cur && *cur != ' ' && *cur != '@')
+ cur++;
+ if (*cur == '@') {
+ cur++;
+ *crash_base = memparse(cur, &tmp);
+ if (cur == tmp) {
+ pr_warn("Memory value expected after '@'\n");
+ return -EINVAL;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * That function parses "simple" (old) crashkernel command lines like
+ *
+ * crashkernel=size[@offset]
+ *
+ * It returns 0 on success and -EINVAL on failure.
+ */
+static int __init parse_crashkernel_simple(char *cmdline,
+ unsigned long long *crash_size,
+ unsigned long long *crash_base)
+{
+ char *cur = cmdline;
+
+ *crash_size = memparse(cmdline, &cur);
+ if (cmdline == cur) {
+ pr_warn("crashkernel: memory value expected\n");
+ return -EINVAL;
+ }
+
+ if (*cur == '@')
+ *crash_base = memparse(cur+1, &cur);
+ else if (*cur != ' ' && *cur != '\0') {
+ pr_warn("crashkernel: unrecognized char: %c\n", *cur);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+#define SUFFIX_HIGH 0
+#define SUFFIX_LOW 1
+#define SUFFIX_NULL 2
+static __initdata char *suffix_tbl[] = {
+ [SUFFIX_HIGH] = ",high",
+ [SUFFIX_LOW] = ",low",
+ [SUFFIX_NULL] = NULL,
+};
+
+/*
+ * That function parses "suffix" crashkernel command lines like
+ *
+ * crashkernel=size,[high|low]
+ *
+ * It returns 0 on success and -EINVAL on failure.
+ */
+static int __init parse_crashkernel_suffix(char *cmdline,
+ unsigned long long *crash_size,
+ const char *suffix)
+{
+ char *cur = cmdline;
+
+ *crash_size = memparse(cmdline, &cur);
+ if (cmdline == cur) {
+ pr_warn("crashkernel: memory value expected\n");
+ return -EINVAL;
+ }
+
+ /* check with suffix */
+ if (strncmp(cur, suffix, strlen(suffix))) {
+ pr_warn("crashkernel: unrecognized char: %c\n", *cur);
+ return -EINVAL;
+ }
+ cur += strlen(suffix);
+ if (*cur != ' ' && *cur != '\0') {
+ pr_warn("crashkernel: unrecognized char: %c\n", *cur);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static __init char *get_last_crashkernel(char *cmdline,
+ const char *name,
+ const char *suffix)
+{
+ char *p = cmdline, *ck_cmdline = NULL;
+
+ /* find crashkernel and use the last one if there are more */
+ p = strstr(p, name);
+ while (p) {
+ char *end_p = strchr(p, ' ');
+ char *q;
+
+ if (!end_p)
+ end_p = p + strlen(p);
+
+ if (!suffix) {
+ int i;
+
+ /* skip the one with any known suffix */
+ for (i = 0; suffix_tbl[i]; i++) {
+ q = end_p - strlen(suffix_tbl[i]);
+ if (!strncmp(q, suffix_tbl[i],
+ strlen(suffix_tbl[i])))
+ goto next;
+ }
+ ck_cmdline = p;
+ } else {
+ q = end_p - strlen(suffix);
+ if (!strncmp(q, suffix, strlen(suffix)))
+ ck_cmdline = p;
+ }
+next:
+ p = strstr(p+1, name);
+ }
+
+ if (!ck_cmdline)
+ return NULL;
+
+ return ck_cmdline;
+}
+
+static int __init __parse_crashkernel(char *cmdline,
+ unsigned long long system_ram,
+ unsigned long long *crash_size,
+ unsigned long long *crash_base,
+ const char *name,
+ const char *suffix)
+{
+ char *first_colon, *first_space;
+ char *ck_cmdline;
+
+ BUG_ON(!crash_size || !crash_base);
+ *crash_size = 0;
+ *crash_base = 0;
+
+ ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
+
+ if (!ck_cmdline)
+ return -EINVAL;
+
+ ck_cmdline += strlen(name);
+
+ if (suffix)
+ return parse_crashkernel_suffix(ck_cmdline, crash_size,
+ suffix);
+ /*
+ * if the commandline contains a ':', then that's the extended
+ * syntax -- if not, it must be the classic syntax
+ */
+ first_colon = strchr(ck_cmdline, ':');
+ first_space = strchr(ck_cmdline, ' ');
+ if (first_colon && (!first_space || first_colon < first_space))
+ return parse_crashkernel_mem(ck_cmdline, system_ram,
+ crash_size, crash_base);
+
+ return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
+}
+
+/*
+ * That function is the entry point for command line parsing and should be
+ * called from the arch-specific code.
+ */
+int __init parse_crashkernel(char *cmdline,
+ unsigned long long system_ram,
+ unsigned long long *crash_size,
+ unsigned long long *crash_base)
+{
+ return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
+ "crashkernel=", NULL);
+}
+
+int __init parse_crashkernel_high(char *cmdline,
+ unsigned long long system_ram,
+ unsigned long long *crash_size,
+ unsigned long long *crash_base)
+{
+ return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
+ "crashkernel=", suffix_tbl[SUFFIX_HIGH]);
+}
+
+int __init parse_crashkernel_low(char *cmdline,
+ unsigned long long system_ram,
+ unsigned long long *crash_size,
+ unsigned long long *crash_base)
+{
+ return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
+ "crashkernel=", suffix_tbl[SUFFIX_LOW]);
+}
+
+static u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
+ void *data, size_t data_len)
+{
+ struct elf_note note;
+
+ note.n_namesz = strlen(name) + 1;
+ note.n_descsz = data_len;
+ note.n_type = type;
+ memcpy(buf, &note, sizeof(note));
+ buf += (sizeof(note) + 3)/4;
+ memcpy(buf, name, note.n_namesz);
+ buf += (note.n_namesz + 3)/4;
+ memcpy(buf, data, note.n_descsz);
+ buf += (note.n_descsz + 3)/4;
+
+ return buf;
+}
+
+static void final_note(u32 *buf)
+{
+ struct elf_note note;
+
+ note.n_namesz = 0;
+ note.n_descsz = 0;
+ note.n_type = 0;
+ memcpy(buf, &note, sizeof(note));
+}
+
+static void update_vmcoreinfo_note(void)
+{
+ u32 *buf = vmcoreinfo_note;
+
+ if (!vmcoreinfo_size)
+ return;
+ buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
+ vmcoreinfo_size);
+ final_note(buf);
+}
+
+void crash_save_vmcoreinfo(void)
+{
+ vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
+ update_vmcoreinfo_note();
+}
+
+void vmcoreinfo_append_str(const char *fmt, ...)
+{
+ va_list args;
+ char buf[0x50];
+ size_t r;
+
+ va_start(args, fmt);
+ r = vscnprintf(buf, sizeof(buf), fmt, args);
+ va_end(args);
+
+ r = min(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 __weak arch_crash_save_vmcoreinfo(void)
+{}
+
+phys_addr_t __weak paddr_vmcoreinfo_note(void)
+{
+ return __pa((unsigned long)(char *)&vmcoreinfo_note);
+}
+
+static int __init crash_save_vmcoreinfo_init(void)
+{
+ VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
+ VMCOREINFO_PAGESIZE(PAGE_SIZE);
+
+ VMCOREINFO_SYMBOL(init_uts_ns);
+ VMCOREINFO_SYMBOL(node_online_map);
+#ifdef CONFIG_MMU
+ VMCOREINFO_SYMBOL(swapper_pg_dir);
+#endif
+ VMCOREINFO_SYMBOL(_stext);
+ VMCOREINFO_SYMBOL(vmap_area_list);
+
+#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_STRUCT_SIZE(mem_section);
+ VMCOREINFO_OFFSET(mem_section, section_mem_map);
+#endif
+ VMCOREINFO_STRUCT_SIZE(page);
+ VMCOREINFO_STRUCT_SIZE(pglist_data);
+ VMCOREINFO_STRUCT_SIZE(zone);
+ VMCOREINFO_STRUCT_SIZE(free_area);
+ VMCOREINFO_STRUCT_SIZE(list_head);
+ VMCOREINFO_SIZE(nodemask_t);
+ VMCOREINFO_OFFSET(page, flags);
+ VMCOREINFO_OFFSET(page, _refcount);
+ VMCOREINFO_OFFSET(page, mapping);
+ VMCOREINFO_OFFSET(page, lru);
+ VMCOREINFO_OFFSET(page, _mapcount);
+ VMCOREINFO_OFFSET(page, private);
+ VMCOREINFO_OFFSET(page, compound_dtor);
+ VMCOREINFO_OFFSET(page, compound_order);
+ VMCOREINFO_OFFSET(page, compound_head);
+ 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_OFFSET(vmap_area, va_start);
+ VMCOREINFO_OFFSET(vmap_area, list);
+ VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
+#ifdef CONFIG_KEXEC
+ log_buf_kexec_setup();
+#endif
+ VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
+ VMCOREINFO_NUMBER(NR_FREE_PAGES);
+ VMCOREINFO_NUMBER(PG_lru);
+ VMCOREINFO_NUMBER(PG_private);
+ VMCOREINFO_NUMBER(PG_swapcache);
+ VMCOREINFO_NUMBER(PG_slab);
+#ifdef CONFIG_MEMORY_FAILURE
+ VMCOREINFO_NUMBER(PG_hwpoison);
+#endif
+ VMCOREINFO_NUMBER(PG_head_mask);
+ VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
+#ifdef CONFIG_X86
+ VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE);
+#endif
+#ifdef CONFIG_HUGETLB_PAGE
+ VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
+#endif
+
+ arch_crash_save_vmcoreinfo();
+ update_vmcoreinfo_note();
+
+ return 0;
+}
+
+subsys_initcall(crash_save_vmcoreinfo_init);
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 5616755..3aa21f3 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -51,12 +51,6 @@ DEFINE_MUTEX(kexec_mutex);
/* Per cpu memory for storing cpu states in case of system crash. */
note_buf_t __percpu *crash_notes;

-/* vmcoreinfo stuff */
-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);
-
/* Flag to indicate we are going to kexec a new kernel */
bool kexec_in_progress = false;

@@ -1081,407 +1075,6 @@ static int __init crash_notes_memory_init(void)
}
subsys_initcall(crash_notes_memory_init);

-
-/*
- * parsing the "crashkernel" commandline
- *
- * this code is intended to be called from architecture specific code
- */
-
-
-/*
- * This function parses command lines in the format
- *
- * crashkernel=ramsize-range:size[,...][@offset]
- *
- * The function returns 0 on success and -EINVAL on failure.
- */
-static int __init parse_crashkernel_mem(char *cmdline,
- unsigned long long system_ram,
- unsigned long long *crash_size,
- unsigned long long *crash_base)
-{
- char *cur = cmdline, *tmp;
-
- /* for each entry of the comma-separated list */
- do {
- unsigned long long start, end = ULLONG_MAX, size;
-
- /* get the start of the range */
- start = memparse(cur, &tmp);
- if (cur == tmp) {
- pr_warn("crashkernel: Memory value expected\n");
- return -EINVAL;
- }
- cur = tmp;
- if (*cur != '-') {
- pr_warn("crashkernel: '-' expected\n");
- return -EINVAL;
- }
- cur++;
-
- /* if no ':' is here, than we read the end */
- if (*cur != ':') {
- end = memparse(cur, &tmp);
- if (cur == tmp) {
- pr_warn("crashkernel: Memory value expected\n");
- return -EINVAL;
- }
- cur = tmp;
- if (end <= start) {
- pr_warn("crashkernel: end <= start\n");
- return -EINVAL;
- }
- }
-
- if (*cur != ':') {
- pr_warn("crashkernel: ':' expected\n");
- return -EINVAL;
- }
- cur++;
-
- size = memparse(cur, &tmp);
- if (cur == tmp) {
- pr_warn("Memory value expected\n");
- return -EINVAL;
- }
- cur = tmp;
- if (size >= system_ram) {
- pr_warn("crashkernel: invalid size\n");
- return -EINVAL;
- }
-
- /* match ? */
- if (system_ram >= start && system_ram < end) {
- *crash_size = size;
- break;
- }
- } while (*cur++ == ',');
-
- if (*crash_size > 0) {
- while (*cur && *cur != ' ' && *cur != '@')
- cur++;
- if (*cur == '@') {
- cur++;
- *crash_base = memparse(cur, &tmp);
- if (cur == tmp) {
- pr_warn("Memory value expected after '@'\n");
- return -EINVAL;
- }
- }
- }
-
- return 0;
-}
-
-/*
- * That function parses "simple" (old) crashkernel command lines like
- *
- * crashkernel=size[@offset]
- *
- * It returns 0 on success and -EINVAL on failure.
- */
-static int __init parse_crashkernel_simple(char *cmdline,
- unsigned long long *crash_size,
- unsigned long long *crash_base)
-{
- char *cur = cmdline;
-
- *crash_size = memparse(cmdline, &cur);
- if (cmdline == cur) {
- pr_warn("crashkernel: memory value expected\n");
- return -EINVAL;
- }
-
- if (*cur == '@')
- *crash_base = memparse(cur+1, &cur);
- else if (*cur != ' ' && *cur != '\0') {
- pr_warn("crashkernel: unrecognized char: %c\n", *cur);
- return -EINVAL;
- }
-
- return 0;
-}
-
-#define SUFFIX_HIGH 0
-#define SUFFIX_LOW 1
-#define SUFFIX_NULL 2
-static __initdata char *suffix_tbl[] = {
- [SUFFIX_HIGH] = ",high",
- [SUFFIX_LOW] = ",low",
- [SUFFIX_NULL] = NULL,
-};
-
-/*
- * That function parses "suffix" crashkernel command lines like
- *
- * crashkernel=size,[high|low]
- *
- * It returns 0 on success and -EINVAL on failure.
- */
-static int __init parse_crashkernel_suffix(char *cmdline,
- unsigned long long *crash_size,
- const char *suffix)
-{
- char *cur = cmdline;
-
- *crash_size = memparse(cmdline, &cur);
- if (cmdline == cur) {
- pr_warn("crashkernel: memory value expected\n");
- return -EINVAL;
- }
-
- /* check with suffix */
- if (strncmp(cur, suffix, strlen(suffix))) {
- pr_warn("crashkernel: unrecognized char: %c\n", *cur);
- return -EINVAL;
- }
- cur += strlen(suffix);
- if (*cur != ' ' && *cur != '\0') {
- pr_warn("crashkernel: unrecognized char: %c\n", *cur);
- return -EINVAL;
- }
-
- return 0;
-}
-
-static __init char *get_last_crashkernel(char *cmdline,
- const char *name,
- const char *suffix)
-{
- char *p = cmdline, *ck_cmdline = NULL;
-
- /* find crashkernel and use the last one if there are more */
- p = strstr(p, name);
- while (p) {
- char *end_p = strchr(p, ' ');
- char *q;
-
- if (!end_p)
- end_p = p + strlen(p);
-
- if (!suffix) {
- int i;
-
- /* skip the one with any known suffix */
- for (i = 0; suffix_tbl[i]; i++) {
- q = end_p - strlen(suffix_tbl[i]);
- if (!strncmp(q, suffix_tbl[i],
- strlen(suffix_tbl[i])))
- goto next;
- }
- ck_cmdline = p;
- } else {
- q = end_p - strlen(suffix);
- if (!strncmp(q, suffix, strlen(suffix)))
- ck_cmdline = p;
- }
-next:
- p = strstr(p+1, name);
- }
-
- if (!ck_cmdline)
- return NULL;
-
- return ck_cmdline;
-}
-
-static int __init __parse_crashkernel(char *cmdline,
- unsigned long long system_ram,
- unsigned long long *crash_size,
- unsigned long long *crash_base,
- const char *name,
- const char *suffix)
-{
- char *first_colon, *first_space;
- char *ck_cmdline;
-
- BUG_ON(!crash_size || !crash_base);
- *crash_size = 0;
- *crash_base = 0;
-
- ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
-
- if (!ck_cmdline)
- return -EINVAL;
-
- ck_cmdline += strlen(name);
-
- if (suffix)
- return parse_crashkernel_suffix(ck_cmdline, crash_size,
- suffix);
- /*
- * if the commandline contains a ':', then that's the extended
- * syntax -- if not, it must be the classic syntax
- */
- first_colon = strchr(ck_cmdline, ':');
- first_space = strchr(ck_cmdline, ' ');
- if (first_colon && (!first_space || first_colon < first_space))
- return parse_crashkernel_mem(ck_cmdline, system_ram,
- crash_size, crash_base);
-
- return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
-}
-
-/*
- * That function is the entry point for command line parsing and should be
- * called from the arch-specific code.
- */
-int __init parse_crashkernel(char *cmdline,
- unsigned long long system_ram,
- unsigned long long *crash_size,
- unsigned long long *crash_base)
-{
- return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
- "crashkernel=", NULL);
-}
-
-int __init parse_crashkernel_high(char *cmdline,
- unsigned long long system_ram,
- unsigned long long *crash_size,
- unsigned long long *crash_base)
-{
- return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
- "crashkernel=", suffix_tbl[SUFFIX_HIGH]);
-}
-
-int __init parse_crashkernel_low(char *cmdline,
- unsigned long long system_ram,
- unsigned long long *crash_size,
- unsigned long long *crash_base)
-{
- return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
- "crashkernel=", suffix_tbl[SUFFIX_LOW]);
-}
-
-static void update_vmcoreinfo_note(void)
-{
- u32 *buf = vmcoreinfo_note;
-
- if (!vmcoreinfo_size)
- return;
- buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
- vmcoreinfo_size);
- final_note(buf);
-}
-
-void crash_save_vmcoreinfo(void)
-{
- vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
- update_vmcoreinfo_note();
-}
-
-void vmcoreinfo_append_str(const char *fmt, ...)
-{
- va_list args;
- char buf[0x50];
- size_t r;
-
- va_start(args, fmt);
- r = vscnprintf(buf, sizeof(buf), fmt, args);
- va_end(args);
-
- r = min(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 __weak arch_crash_save_vmcoreinfo(void)
-{}
-
-phys_addr_t __weak paddr_vmcoreinfo_note(void)
-{
- return __pa((unsigned long)(char *)&vmcoreinfo_note);
-}
-
-static int __init crash_save_vmcoreinfo_init(void)
-{
- VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
- VMCOREINFO_PAGESIZE(PAGE_SIZE);
-
- VMCOREINFO_SYMBOL(init_uts_ns);
- VMCOREINFO_SYMBOL(node_online_map);
-#ifdef CONFIG_MMU
- VMCOREINFO_SYMBOL(swapper_pg_dir);
-#endif
- VMCOREINFO_SYMBOL(_stext);
- VMCOREINFO_SYMBOL(vmap_area_list);
-
-#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_STRUCT_SIZE(mem_section);
- VMCOREINFO_OFFSET(mem_section, section_mem_map);
-#endif
- VMCOREINFO_STRUCT_SIZE(page);
- VMCOREINFO_STRUCT_SIZE(pglist_data);
- VMCOREINFO_STRUCT_SIZE(zone);
- VMCOREINFO_STRUCT_SIZE(free_area);
- VMCOREINFO_STRUCT_SIZE(list_head);
- VMCOREINFO_SIZE(nodemask_t);
- VMCOREINFO_OFFSET(page, flags);
- VMCOREINFO_OFFSET(page, _refcount);
- VMCOREINFO_OFFSET(page, mapping);
- VMCOREINFO_OFFSET(page, lru);
- VMCOREINFO_OFFSET(page, _mapcount);
- VMCOREINFO_OFFSET(page, private);
- VMCOREINFO_OFFSET(page, compound_dtor);
- VMCOREINFO_OFFSET(page, compound_order);
- VMCOREINFO_OFFSET(page, compound_head);
- 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_OFFSET(vmap_area, va_start);
- VMCOREINFO_OFFSET(vmap_area, list);
- 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);
- VMCOREINFO_NUMBER(PG_private);
- VMCOREINFO_NUMBER(PG_swapcache);
- VMCOREINFO_NUMBER(PG_slab);
-#ifdef CONFIG_MEMORY_FAILURE
- VMCOREINFO_NUMBER(PG_hwpoison);
-#endif
- VMCOREINFO_NUMBER(PG_head_mask);
- VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
-#ifdef CONFIG_X86
- VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE);
-#endif
-#ifdef CONFIG_HUGETLB_PAGE
- VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
-#endif
-
- arch_crash_save_vmcoreinfo();
- update_vmcoreinfo_note();
-
- return 0;
-}
-
-subsys_initcall(crash_save_vmcoreinfo_init);
-
/*
* Move into place and start executing a preloaded standalone
* executable. If nothing was preloaded return an error.

2016-11-25 11:54:25

by Hari Bathini

[permalink] [raw]

Subject: [PATCH v2 2/5] ia64: reuse append_elf_note() and final_note() functions

Get rid of multiple definitions of append_elf_note() & final_note()
functions. Reuse these functions compiled under CONFIG_CRASH_CORE.

Signed-off-by: Hari Bathini <[email protected]>
---
arch/ia64/kernel/crash.c | 22 ----------------------
include/linux/crash_core.h | 4 ++++
kernel/crash_core.c | 6 +++---
kernel/kexec_core.c | 28 ----------------------------
4 files changed, 7 insertions(+), 53 deletions(-)

diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
index 2955f35..75859a0 100644
--- a/arch/ia64/kernel/crash.c
+++ b/arch/ia64/kernel/crash.c
@@ -27,28 +27,6 @@ static int kdump_freeze_monarch;
static int kdump_on_init = 1;
static int kdump_on_fatal_mca = 1;

-static inline Elf64_Word
-*append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
- size_t data_len)
-{
- struct elf_note *note = (struct elf_note *)buf;
- note->n_namesz = strlen(name) + 1;
- note->n_descsz = data_len;
- note->n_type = type;
- buf += (sizeof(*note) + 3)/4;
- memcpy(buf, name, note->n_namesz);
- buf += (note->n_namesz + 3)/4;
- memcpy(buf, data, data_len);
- buf += (data_len + 3)/4;
- return buf;
-}
-
-static void
-final_note(void *buf)
-{
- memset(buf, 0, sizeof(struct elf_note));
-}
-
extern void ia64_dump_cpu_regs(void *);

static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 9a4f4b0..2ae20b1 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -61,6 +61,10 @@ extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
extern size_t vmcoreinfo_size;
extern size_t vmcoreinfo_max_size;

+u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
+ void *data, size_t data_len);
+void final_note(u32 *buf);
+
int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
unsigned long long *crash_size, unsigned long long *crash_base);
int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 60a98fc..9223976 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -291,8 +291,8 @@ int __init parse_crashkernel_low(char *cmdline,
"crashkernel=", suffix_tbl[SUFFIX_LOW]);
}

-static u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
- void *data, size_t data_len)
+u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
+ void *data, size_t data_len)
{
struct elf_note note;

@@ -309,7 +309,7 @@ static u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
return buf;
}

-static void final_note(u32 *buf)
+void final_note(u32 *buf)
{
struct elf_note note;

diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 3aa21f3..596cb32 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -988,34 +988,6 @@ int crash_shrink_memory(unsigned long new_size)
return ret;
}

-static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data,
- size_t data_len)
-{
- struct elf_note note;
-
- note.n_namesz = strlen(name) + 1;
- note.n_descsz = data_len;
- note.n_type = type;
- memcpy(buf, &note, sizeof(note));
- buf += (sizeof(note) + 3)/4;
- memcpy(buf, name, note.n_namesz);
- buf += (note.n_namesz + 3)/4;
- memcpy(buf, data, note.n_descsz);
- buf += (note.n_descsz + 3)/4;
-
- return buf;
-}
-
-static void final_note(u32 *buf)
-{
- struct elf_note note;
-
- note.n_namesz = 0;
- note.n_descsz = 0;
- note.n_type = 0;
- memcpy(buf, &note, sizeof(note));
-}
-
void crash_save_cpu(struct pt_regs *regs, int cpu)
{
struct elf_prstatus prstatus;

2016-11-25 11:54:38

by Hari Bathini

[permalink] [raw]

Subject: [PATCH v2 3/5] powerpc/fadump: remove dependency with CONFIG_KEXEC

Now that crashkernel parameter parsing and vmcoreinfo related code is
moved under CONFIG_CRASH_CORE instead of CONFIG_KEXEC_CORE, remove
dependency with CONFIG_KEXEC for CONFIG_FA_DUMP. While here, get rid
of definitions of fadump_append_elf_note() & fadump_final_note()
functions to reuse similar functions compiled under CONFIG_CRASH_CORE.

Signed-off-by: Hari Bathini <[email protected]>
---
arch/powerpc/Kconfig | 10 ++++++----
arch/powerpc/include/asm/fadump.h | 2 ++
arch/powerpc/kernel/crash.c | 2 --
arch/powerpc/kernel/fadump.c | 34 +++-------------------------------
arch/powerpc/kernel/setup-common.c | 5 +++++
5 files changed, 16 insertions(+), 37 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 65fba4c..644703f 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -479,21 +479,23 @@ config RELOCATABLE
load address of the kernel (eg. u-boot/mkimage).

config CRASH_DUMP
- bool "Build a kdump crash kernel"
+ bool "Build a dump capture kernel"
depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
help
- Build a kernel suitable for use as a kdump capture kernel.
+ Build a kernel suitable for use as a dump capture kernel.
The same kernel binary can be used as production kernel and dump
capture kernel.

config FA_DUMP
bool "Firmware-assisted dump"
- depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
+ depends on PPC64 && PPC_RTAS
+ select CRASH_CORE
+ select CRASH_DUMP
help
A robust mechanism to get reliable kernel crash dump with
assistance from firmware. This approach does not use kexec,
- instead firmware assists in booting the kdump kernel
+ instead firmware assists in booting the capture kernel
while preserving memory contents. Firmware-assisted dump
is meant to be a kdump replacement offering robustness and
speed not possible without system firmware assistance.
diff --git a/arch/powerpc/include/asm/fadump.h b/arch/powerpc/include/asm/fadump.h
index 0031806..60b9108 100644
--- a/arch/powerpc/include/asm/fadump.h
+++ b/arch/powerpc/include/asm/fadump.h
@@ -73,6 +73,8 @@
reg_entry++; \
})

+extern int crashing_cpu;
+
/* Kernel Dump section info */
struct fadump_section {
__be32 request_flag;
diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index 47b63de..cbabb5a 100644
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -43,8 +43,6 @@
#define IPI_TIMEOUT 10000
#define REAL_MODE_TIMEOUT 10000

-/* This keeps a track of which one is the crashing cpu. */
-int crashing_cpu = -1;
static int time_to_dump;

#define CRASH_HANDLER_MAX 3
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 8f0c7c5..db0b339 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -486,34 +486,6 @@ fadump_read_registers(struct fadump_reg_entry *reg_entry, struct pt_regs *regs)
return reg_entry;
}

-static u32 *fadump_append_elf_note(u32 *buf, char *name, unsigned type,
- void *data, size_t data_len)
-{
- struct elf_note note;
-
- note.n_namesz = strlen(name) + 1;
- note.n_descsz = data_len;
- note.n_type = type;
- memcpy(buf, &note, sizeof(note));
- buf += (sizeof(note) + 3)/4;
- memcpy(buf, name, note.n_namesz);
- buf += (note.n_namesz + 3)/4;
- memcpy(buf, data, note.n_descsz);
- buf += (note.n_descsz + 3)/4;
-
- return buf;
-}
-
-static void fadump_final_note(u32 *buf)
-{
- struct elf_note note;
-
- note.n_namesz = 0;
- note.n_descsz = 0;
- note.n_type = 0;
- memcpy(buf, &note, sizeof(note));
-}
-
static u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs)
{
struct elf_prstatus prstatus;
@@ -524,8 +496,8 @@ static u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs)
* prstatus.pr_pid = ????
*/
elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);
- buf = fadump_append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
- &prstatus, sizeof(prstatus));
+ buf = append_elf_note(buf, CRASH_CORE_NOTE_NAME, NT_PRSTATUS,
+ &prstatus, sizeof(prstatus));
return buf;
}

@@ -666,7 +638,7 @@ static int __init fadump_build_cpu_notes(const struct fadump_mem_struct *fdm)
note_buf = fadump_regs_to_elf_notes(note_buf, &regs);
}
}
- fadump_final_note(note_buf);
+ final_note(note_buf);

if (fdh) {
pr_debug("Updating elfcore header (%llx) with cpu notes\n",
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 270ee30..d322527 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -116,6 +116,11 @@ int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif

+#if defined(CONFIG_KEXEC) || defined(CONFIG_FA_DUMP)
+/* This keeps a track of which one is the crashing cpu. */
+int crashing_cpu = -1;
+#endif
+
/* also used by kexec */
void machine_shutdown(void)
{

2016-11-25 11:54:57

by Hari Bathini

[permalink] [raw]

Subject: [PATCH v2 5/5] powerpc/fadump: update documentation about crashkernel parameter reuse

As we are reusing crashkernel parameter instead of fadump_reserve_mem
parameter to specify the memory to reserve for fadump's crash kernel,
update the documentation accordingly.

Signed-off-by: Hari Bathini <[email protected]>
---
Documentation/powerpc/firmware-assisted-dump.txt | 23 ++++++++++++++--------
1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/Documentation/powerpc/firmware-assisted-dump.txt b/Documentation/powerpc/firmware-assisted-dump.txt
index 3007bc9..8394bc8 100644
--- a/Documentation/powerpc/firmware-assisted-dump.txt
+++ b/Documentation/powerpc/firmware-assisted-dump.txt
@@ -55,10 +55,14 @@ as follows:
booted with restricted memory. By default, the boot memory
size will be the larger of 5% of system RAM or 256MB.
Alternatively, user can also specify boot memory size
- through boot parameter 'fadump_reserve_mem=' which will
- override the default calculated size. Use this option
- if default boot memory size is not sufficient for second
- kernel to boot successfully.
+ through boot parameter 'crashkernel=' which will override
+ the default calculated size. Use this option if default
+ boot memory size is not sufficient for second kernel to
+ boot successfully. For syntax of crashkernel= parameter,
+ refer to Documentation/kdump/kdump.txt. If any offset is
+ provided in crashkernel= parameter, it will be ignored
+ as fadump reserves memory at end of RAM for boot memory
+ dump preservation in case of a crash.

-- After the low memory (boot memory) area has been saved, the
firmware will reset PCI and other hardware state. It will
@@ -158,13 +162,16 @@ How to enable firmware-assisted dump (fadump):

1. Set config option CONFIG_FA_DUMP=y and build kernel.
2. Boot into linux kernel with 'fadump=on' kernel cmdline option.
-3. Optionally, user can also set 'fadump_reserve_mem=' kernel cmdline
+3. Optionally, user can also set 'crashkernel=' kernel cmdline
to specify size of the memory to reserve for boot memory dump
preservation.

-NOTE: If firmware-assisted dump fails to reserve memory then it will
- fallback to existing kdump mechanism if 'crashkernel=' option
- is set at kernel cmdline.
+NOTE: 1. 'fadump_reserve_mem=' parameter has been deprecated. Instead
+ use 'crashkernel=' to specify size of the memory to reserve
+ for boot memory dump preservation.
+ 2. If firmware-assisted dump fails to reserve memory then it
+ will fallback to existing kdump mechanism if 'crashkernel='
+ option is set at kernel cmdline.

Sysfs/debugfs files:
------------

2016-11-25 11:55:08

by Hari Bathini

[permalink] [raw]

Subject: [PATCH v2 4/5] powerpc/fadump: reuse crashkernel parameter for fadump memory reservation

fadump supports specifying memory to reserve for fadump's crash kernel
with fadump_reserve_mem kernel parameter. This parameter currently
supports passing a fixed memory size, like fadump_reserve_mem=<size>
only. This patch aims to add support for other syntaxes like range-based
memory size <range1>:<size1>[,<range2>:<size2>,<range3>:<size3>,...]
which allows using the same parameter to boot the kernel with different
system RAM sizes.

As crashkernel parameter already supports the above mentioned syntaxes,
this patch deprecates fadump_reserve_mem parameter and reuses crashkernel
parameter instead, to specify memory for fadump's crash kernel memory
reservation as well. If any offset is provided in crashkernel parameter,
it will be ignored in case of fadump, as fadump reserves memory at end
of RAM.

Advantages using crashkernel parameter instead of fadump_reserve_mem
parameter are one less kernel parameter overall, code reuse and support
for multiple syntaxes to specify memory.

Suggested-by: Dave Young <[email protected]>
Signed-off-by: Hari Bathini <[email protected]>
---
arch/powerpc/kernel/fadump.c | 23 ++++++++++-------------
1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index db0b339..de7d39a 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -210,14 +210,20 @@ static unsigned long init_fadump_mem_struct(struct fadump_mem_struct *fdm,
*/
static inline unsigned long fadump_calculate_reserve_size(void)
{
- unsigned long size;
+ int ret;
+ unsigned long long base, size;

/*
- * Check if the size is specified through fadump_reserve_mem= cmdline
- * option. If yes, then use that.
+ * Check if the size is specified through crashkernel= cmdline
+ * option. If yes, then use that but ignore base as fadump
+ * reserves memory at end of RAM.
*/
- if (fw_dump.reserve_bootvar)
+ ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
+ &size, &base);
+ if (ret == 0 && size > 0) {
+ fw_dump.reserve_bootvar = (unsigned long)size;
return fw_dump.reserve_bootvar;
+ }

/* divide by 20 to get 5% of value */
size = memblock_end_of_DRAM() / 20;
@@ -353,15 +359,6 @@ static int __init early_fadump_param(char *p)
}
early_param("fadump", early_fadump_param);

-/* Look for fadump_reserve_mem= cmdline option */
-static int __init early_fadump_reserve_mem(char *p)
-{
- if (p)
- fw_dump.reserve_bootvar = memparse(p, &p);
- return 0;
-}
-early_param("fadump_reserve_mem", early_fadump_reserve_mem);
-
static void register_fw_dump(struct fadump_mem_struct *fdm)
{
int rc;

2016-12-01 04:57:09

by Dave Young

[permalink] [raw]

Subject: Re: [PATCH v2 2/5] ia64: reuse append_elf_note() and final_note() functions

Hi Hari

Personally I like V1 more, but split the patch 2 is easier for ia64
people to reivew. I did basic x86 testing, it runs ok.

On 11/25/16 at 05:24pm, Hari Bathini wrote:
> Get rid of multiple definitions of append_elf_note() & final_note()
> functions. Reuse these functions compiled under CONFIG_CRASH_CORE.
>
> Signed-off-by: Hari Bathini <[email protected]>
> ---
> arch/ia64/kernel/crash.c | 22 ----------------------
> include/linux/crash_core.h | 4 ++++
> kernel/crash_core.c | 6 +++---
> kernel/kexec_core.c | 28 ----------------------------
> 4 files changed, 7 insertions(+), 53 deletions(-)
>
> diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
> index 2955f35..75859a0 100644
> --- a/arch/ia64/kernel/crash.c
> +++ b/arch/ia64/kernel/crash.c
> @@ -27,28 +27,6 @@ static int kdump_freeze_monarch;
> static int kdump_on_init = 1;
> static int kdump_on_fatal_mca = 1;
>
> -static inline Elf64_Word
> -*append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
> - size_t data_len)
> -{
> - struct elf_note *note = (struct elf_note *)buf;
> - note->n_namesz = strlen(name) + 1;
> - note->n_descsz = data_len;
> - note->n_type = type;
> - buf += (sizeof(*note) + 3)/4;
> - memcpy(buf, name, note->n_namesz);
> - buf += (note->n_namesz + 3)/4;
> - memcpy(buf, data, data_len);
> - buf += (data_len + 3)/4;
> - return buf;
> -}
> -
> -static void
> -final_note(void *buf)
> -{
> - memset(buf, 0, sizeof(struct elf_note));
> -}
> -

The above IA64 version looks better than the functions in kexec_core.c
about the Elf64_Word type usage and the simpler final_note function.

Care to update crash_core.c to use this instead?

Otherwise I'm fine with the changes.

> extern void ia64_dump_cpu_regs(void *);
>
> static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
> diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
> index 9a4f4b0..2ae20b1 100644
> --- a/include/linux/crash_core.h
> +++ b/include/linux/crash_core.h
> @@ -61,6 +61,10 @@ extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
> extern size_t vmcoreinfo_size;
> extern size_t vmcoreinfo_max_size;
>
> +u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> + void *data, size_t data_len);
> +void final_note(u32 *buf);
> +
> int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
> unsigned long long *crash_size, unsigned long long *crash_base);
> int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index 60a98fc..9223976 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -291,8 +291,8 @@ int __init parse_crashkernel_low(char *cmdline,
> "crashkernel=", suffix_tbl[SUFFIX_LOW]);
> }
>
> -static u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> - void *data, size_t data_len)
> +u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> + void *data, size_t data_len)
> {
> struct elf_note note;
>
> @@ -309,7 +309,7 @@ static u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> return buf;
> }
>
> -static void final_note(u32 *buf)
> +void final_note(u32 *buf)
> {
> struct elf_note note;
>
> diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
> index 3aa21f3..596cb32 100644
> --- a/kernel/kexec_core.c
> +++ b/kernel/kexec_core.c
> @@ -988,34 +988,6 @@ int crash_shrink_memory(unsigned long new_size)
> return ret;
> }
>
> -static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data,
> - size_t data_len)
> -{
> - struct elf_note note;
> -
> - note.n_namesz = strlen(name) + 1;
> - note.n_descsz = data_len;
> - note.n_type = type;
> - memcpy(buf, &note, sizeof(note));
> - buf += (sizeof(note) + 3)/4;
> - memcpy(buf, name, note.n_namesz);
> - buf += (note.n_namesz + 3)/4;
> - memcpy(buf, data, note.n_descsz);
> - buf += (note.n_descsz + 3)/4;
> -
> - return buf;
> -}
> -
> -static void final_note(u32 *buf)
> -{
> - struct elf_note note;
> -
> - note.n_namesz = 0;
> - note.n_descsz = 0;
> - note.n_type = 0;
> - memcpy(buf, &note, sizeof(note));
> -}
> -
> void crash_save_cpu(struct pt_regs *regs, int cpu)
> {
> struct elf_prstatus prstatus;
>
>
> _______________________________________________
> kexec mailing list
> [email protected]
> http://lists.infradead.org/mailman/listinfo/kexec

Thanks
Dave

2016-12-02 11:26:59

by Hari Bathini

[permalink] [raw]

Subject: Re: [PATCH v2 2/5] ia64: reuse append_elf_note() and final_note() functions

Hi Dave,

Thanks for the review.

On Thursday 01 December 2016 10:26 AM, Dave Young wrote:
> Hi Hari
>
> Personally I like V1 more, but split the patch 2 is easier for ia64
> people to reivew. I did basic x86 testing, it runs ok.
>
> On 11/25/16 at 05:24pm, Hari Bathini wrote:
>> Get rid of multiple definitions of append_elf_note() & final_note()
>> functions. Reuse these functions compiled under CONFIG_CRASH_CORE.
>>
>> Signed-off-by: Hari Bathini <[email protected]>
>> ---
>> arch/ia64/kernel/crash.c | 22 ----------------------
>> include/linux/crash_core.h | 4 ++++
>> kernel/crash_core.c | 6 +++---
>> kernel/kexec_core.c | 28 ----------------------------
>> 4 files changed, 7 insertions(+), 53 deletions(-)
>>
>> diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
>> index 2955f35..75859a0 100644
>> --- a/arch/ia64/kernel/crash.c
>> +++ b/arch/ia64/kernel/crash.c
>> @@ -27,28 +27,6 @@ static int kdump_freeze_monarch;
>> static int kdump_on_init = 1;
>> static int kdump_on_fatal_mca = 1;
>>
>> -static inline Elf64_Word
>> -*append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
>> - size_t data_len)
>> -{
>> - struct elf_note *note = (struct elf_note *)buf;
>> - note->n_namesz = strlen(name) + 1;
>> - note->n_descsz = data_len;
>> - note->n_type = type;
>> - buf += (sizeof(*note) + 3)/4;
>> - memcpy(buf, name, note->n_namesz);
>> - buf += (note->n_namesz + 3)/4;
>> - memcpy(buf, data, data_len);
>> - buf += (data_len + 3)/4;
>> - return buf;
>> -}
>> -
>> -static void
>> -final_note(void *buf)
>> -{
>> - memset(buf, 0, sizeof(struct elf_note));
>> -}
>> -
> The above IA64 version looks better than the functions in kexec_core.c
> about the Elf64_Word type usage and the simpler final_note function.

Hmmm.. Is void* better over Elf64_Word* to be agnostic of Elf32 or Elf64
type?

> Care to update crash_core.c to use this instead?

Sure. Will resend.

Thanks
Hari

2016-12-02 19:26:36

by Eric W. Biederman

[permalink] [raw]

Subject: Re: [PATCH v2 2/5] ia64: reuse append_elf_note() and final_note() functions

Hari Bathini <[email protected]> writes:

> Hi Dave,
>
>
> Thanks for the review.
>
>
> On Thursday 01 December 2016 10:26 AM, Dave Young wrote:
>> Hi Hari
>>
>> Personally I like V1 more, but split the patch 2 is easier for ia64
>> people to reivew. I did basic x86 testing, it runs ok.
>>
>> On 11/25/16 at 05:24pm, Hari Bathini wrote:
>>> Get rid of multiple definitions of append_elf_note() & final_note()
>>> functions. Reuse these functions compiled under CONFIG_CRASH_CORE.
>>>
>>> Signed-off-by: Hari Bathini <[email protected]>
>>> ---
>>> arch/ia64/kernel/crash.c | 22 ----------------------
>>> include/linux/crash_core.h | 4 ++++
>>> kernel/crash_core.c | 6 +++---
>>> kernel/kexec_core.c | 28 ----------------------------
>>> 4 files changed, 7 insertions(+), 53 deletions(-)
>>>
>>> diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
>>> index 2955f35..75859a0 100644
>>> --- a/arch/ia64/kernel/crash.c
>>> +++ b/arch/ia64/kernel/crash.c
>>> @@ -27,28 +27,6 @@ static int kdump_freeze_monarch;
>>> static int kdump_on_init = 1;
>>> static int kdump_on_fatal_mca = 1;
>>> -static inline Elf64_Word
>>> -*append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
>>> - size_t data_len)
>>> -{
>>> - struct elf_note *note = (struct elf_note *)buf;
>>> - note->n_namesz = strlen(name) + 1;
>>> - note->n_descsz = data_len;
>>> - note->n_type = type;
>>> - buf += (sizeof(*note) + 3)/4;
>>> - memcpy(buf, name, note->n_namesz);
>>> - buf += (note->n_namesz + 3)/4;
>>> - memcpy(buf, data, data_len);
>>> - buf += (data_len + 3)/4;
>>> - return buf;
>>> -}
>>> -
>>> -static void
>>> -final_note(void *buf)
>>> -{
>>> - memset(buf, 0, sizeof(struct elf_note));
>>> -}
>>> -
>> The above IA64 version looks better than the functions in kexec_core.c
>> about the Elf64_Word type usage and the simpler final_note function.
>
> Hmmm.. Is void* better over Elf64_Word* to be agnostic of Elf32 or
> Elf64 type?

Both Elf64_Word and Elf32_Word result in a u32. So I expect the right
solution is to add a definition of Elf_Word to include/linux/elf.h
and to make the buffer "Elf_Word *buf".

That way we preserve the alignment knowledge, while making the code
depend on 32bit or 64bit.

Eric

2016-12-16 06:37:41

by Hari Bathini

[permalink] [raw]

Subject: Re: [PATCH v2 2/5] ia64: reuse append_elf_note() and final_note() functions

On Saturday 03 December 2016 12:52 AM, Eric W. Biederman wrote:
> Hari Bathini <[email protected]> writes:
>
>> Hi Dave,
>>
>>
>> Thanks for the review.
>>
>>
>> On Thursday 01 December 2016 10:26 AM, Dave Young wrote:
>>> Hi Hari
>>>
>>> Personally I like V1 more, but split the patch 2 is easier for ia64
>>> people to reivew. I did basic x86 testing, it runs ok.
>>>
>>> On 11/25/16 at 05:24pm, Hari Bathini wrote:
>>>> Get rid of multiple definitions of append_elf_note() & final_note()
>>>> functions. Reuse these functions compiled under CONFIG_CRASH_CORE.
>>>>
>>>> Signed-off-by: Hari Bathini <[email protected]>
>>>> ---
>>>> arch/ia64/kernel/crash.c | 22 ----------------------
>>>> include/linux/crash_core.h | 4 ++++
>>>> kernel/crash_core.c | 6 +++---
>>>> kernel/kexec_core.c | 28 ----------------------------
>>>> 4 files changed, 7 insertions(+), 53 deletions(-)
>>>>
>>>> diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
>>>> index 2955f35..75859a0 100644
>>>> --- a/arch/ia64/kernel/crash.c
>>>> +++ b/arch/ia64/kernel/crash.c
>>>> @@ -27,28 +27,6 @@ static int kdump_freeze_monarch;
>>>> static int kdump_on_init = 1;
>>>> static int kdump_on_fatal_mca = 1;
>>>> -static inline Elf64_Word
>>>> -*append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
>>>> - size_t data_len)
>>>> -{
>>>> - struct elf_note *note = (struct elf_note *)buf;
>>>> - note->n_namesz = strlen(name) + 1;
>>>> - note->n_descsz = data_len;
>>>> - note->n_type = type;
>>>> - buf += (sizeof(*note) + 3)/4;
>>>> - memcpy(buf, name, note->n_namesz);
>>>> - buf += (note->n_namesz + 3)/4;
>>>> - memcpy(buf, data, data_len);
>>>> - buf += (data_len + 3)/4;
>>>> - return buf;
>>>> -}
>>>> -
>>>> -static void
>>>> -final_note(void *buf)
>>>> -{
>>>> - memset(buf, 0, sizeof(struct elf_note));
>>>> -}
>>>> -
>>> The above IA64 version looks better than the functions in kexec_core.c
>>> about the Elf64_Word type usage and the simpler final_note function.
>> Hmmm.. Is void* better over Elf64_Word* to be agnostic of Elf32 or
>> Elf64 type?
> Both Elf64_Word and Elf32_Word result in a u32. So I expect the right
> solution is to add a definition of Elf_Word to include/linux/elf.h
> and to make the buffer "Elf_Word *buf".
>
> That way we preserve the alignment knowledge, while making the code
> depend on 32bit or 64bit.
>
> Eric
>

Thanks for the review, Eric. Will address this in the next version.

As some recent changes in powerpc tree may cause merger conflicts,
I will wait for those changes to get into linus's tree and rebase the
next version on top of that..

Thanks
Hari