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kexec-tools/kexec-tools-2.0.20-makedumpfile-printk-add-support-for-lockless-ringbuffer.patch
DistroBaker 7d0122bd5d Merged update from upstream sources 
This is an automated DistroBaker update from upstream sources.
If you do not know what this is about or would like to opt out,
contact the OSCI team.

Source: https://src.fedoraproject.org/rpms/kexec-tools.git#7cb4be80cdaaf85b7dcbdf8f15b113192159026b
2020-12-23 10:00:07 +00:00

588 lines
19 KiB
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From c617ec63339222f3a44d73e36677a9acc8954ccd Mon Sep 17 00:00:00 2001
From: John Ogness <john.ogness@linutronix.de>
Date: Thu, 19 Nov 2020 02:41:21 +0000
Subject: [PATCH 1/2] [PATCH 1/2] printk: add support for lockless ringbuffer
* Required for kernel 5.10
Linux 5.10 introduces a new lockless ringbuffer. The new ringbuffer
is structured completely different to the previous iterations.
Add support for retrieving the ringbuffer from debug information
and/or using vmcoreinfo. The new ringbuffer is detected based on
the availability of the "prb" symbol.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
---
Makefile | 2 +-
dwarf_info.c | 36 ++++++++-
makedumpfile.c | 103 +++++++++++++++++++++++-
makedumpfile.h | 58 ++++++++++++++
printk.c | 207 +++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 399 insertions(+), 7 deletions(-)
create mode 100644 printk.c
diff --git a/makedumpfile-1.6.8/Makefile b/makedumpfile-1.6.8/Makefile
index e5ac71a..cb6bd42 100644
--- a/makedumpfile-1.6.8/Makefile
+++ b/makedumpfile-1.6.8/Makefile
@@ -45,7 +45,7 @@ CFLAGS_ARCH += -m32
endif
SRC_BASE = makedumpfile.c makedumpfile.h diskdump_mod.h sadump_mod.h sadump_info.h
-SRC_PART = print_info.c dwarf_info.c elf_info.c erase_info.c sadump_info.c cache.c tools.c
+SRC_PART = print_info.c dwarf_info.c elf_info.c erase_info.c sadump_info.c cache.c tools.c printk.c
OBJ_PART=$(patsubst %.c,%.o,$(SRC_PART))
SRC_ARCH = arch/arm.c arch/arm64.c arch/x86.c arch/x86_64.c arch/ia64.c arch/ppc64.c arch/s390x.c arch/ppc.c arch/sparc64.c
OBJ_ARCH=$(patsubst %.c,%.o,$(SRC_ARCH))
diff --git a/makedumpfile-1.6.8/dwarf_info.c b/makedumpfile-1.6.8/dwarf_info.c
index e42a9f5..543588b 100644
--- a/makedumpfile-1.6.8/dwarf_info.c
+++ b/makedumpfile-1.6.8/dwarf_info.c
@@ -614,6 +614,7 @@ search_structure(Dwarf_Die *die, int *found)
{
int tag;
const char *name;
+ Dwarf_Die die_type;
/*
* If we get to here then we don't have any more
@@ -622,9 +623,31 @@ search_structure(Dwarf_Die *die, int *found)
do {
tag = dwarf_tag(die);
name = dwarf_diename(die);
- if ((tag != DW_TAG_structure_type) || (!name)
- || strcmp(name, dwarf_info.struct_name))
+ if ((!name) || strcmp(name, dwarf_info.struct_name))
+ continue;
+
+ if (tag == DW_TAG_typedef) {
+ if (!get_die_type(die, &die_type)) {
+ ERRMSG("Can't get CU die of DW_AT_type.\n");
+ break;
+ }
+
+ /* Resolve typedefs of typedefs. */
+ while ((tag = dwarf_tag(&die_type)) == DW_TAG_typedef) {
+ if (!get_die_type(&die_type, &die_type)) {
+ ERRMSG("Can't get CU die of DW_AT_type.\n");
+ return;
+ }
+ }
+
+ if (tag != DW_TAG_structure_type)
+ continue;
+ die = &die_type;
+
+ } else if (tag != DW_TAG_structure_type) {
continue;
+ }
+
/*
* Skip if DW_AT_byte_size is not included.
*/
@@ -740,6 +763,15 @@ search_typedef(Dwarf_Die *die, int *found)
ERRMSG("Can't get CU die of DW_AT_type.\n");
break;
}
+
+ /* Resolve typedefs of typedefs. */
+ while ((tag = dwarf_tag(&die_type)) == DW_TAG_typedef) {
+ if (!get_die_type(&die_type, &die_type)) {
+ ERRMSG("Can't get CU die of DW_AT_type.\n");
+ return;
+ }
+ }
+
dwarf_info.struct_size = dwarf_bytesize(&die_type);
if (dwarf_info.struct_size <= 0)
continue;
diff --git a/makedumpfile-1.6.8/makedumpfile.c b/makedumpfile-1.6.8/makedumpfile.c
index cdde040..061741f 100644
--- a/makedumpfile-1.6.8/makedumpfile.c
+++ b/makedumpfile-1.6.8/makedumpfile.c
@@ -1555,6 +1555,7 @@ get_symbol_info(void)
SYMBOL_INIT(node_data, "node_data");
SYMBOL_INIT(pgdat_list, "pgdat_list");
SYMBOL_INIT(contig_page_data, "contig_page_data");
+ SYMBOL_INIT(prb, "prb");
SYMBOL_INIT(log_buf, "log_buf");
SYMBOL_INIT(log_buf_len, "log_buf_len");
SYMBOL_INIT(log_end, "log_end");
@@ -1971,16 +1972,47 @@ get_structure_info(void)
OFFSET_INIT(elf64_phdr.p_memsz, "elf64_phdr", "p_memsz");
SIZE_INIT(printk_log, "printk_log");
- if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
+ SIZE_INIT(printk_ringbuffer, "printk_ringbuffer");
+ if ((SIZE(printk_ringbuffer) != NOT_FOUND_STRUCTURE)) {
+ info->flag_use_printk_ringbuffer = TRUE;
+ info->flag_use_printk_log = FALSE;
+
+ OFFSET_INIT(printk_ringbuffer.desc_ring, "printk_ringbuffer", "desc_ring");
+ OFFSET_INIT(printk_ringbuffer.text_data_ring, "printk_ringbuffer", "text_data_ring");
+
+ OFFSET_INIT(prb_desc_ring.count_bits, "prb_desc_ring", "count_bits");
+ OFFSET_INIT(prb_desc_ring.descs, "prb_desc_ring", "descs");
+ OFFSET_INIT(prb_desc_ring.infos, "prb_desc_ring", "infos");
+ OFFSET_INIT(prb_desc_ring.head_id, "prb_desc_ring", "head_id");
+ OFFSET_INIT(prb_desc_ring.tail_id, "prb_desc_ring", "tail_id");
+
+ SIZE_INIT(prb_desc, "prb_desc");
+ OFFSET_INIT(prb_desc.state_var, "prb_desc", "state_var");
+ OFFSET_INIT(prb_desc.text_blk_lpos, "prb_desc", "text_blk_lpos");
+
+ OFFSET_INIT(prb_data_blk_lpos.begin, "prb_data_blk_lpos", "begin");
+ OFFSET_INIT(prb_data_blk_lpos.next, "prb_data_blk_lpos", "next");
+
+ OFFSET_INIT(prb_data_ring.size_bits, "prb_data_ring", "size_bits");
+ OFFSET_INIT(prb_data_ring.data, "prb_data_ring", "data");
+
+ SIZE_INIT(printk_info, "printk_info");
+ OFFSET_INIT(printk_info.ts_nsec, "printk_info", "ts_nsec");
+ OFFSET_INIT(printk_info.text_len, "printk_info", "text_len");
+
+ OFFSET_INIT(atomic_long_t.counter, "atomic_long_t", "counter");
+ } else if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
/*
* In kernel 3.11-rc4 the log structure name was renamed
* to "printk_log".
*/
+ info->flag_use_printk_ringbuffer = FALSE;
info->flag_use_printk_log = TRUE;
OFFSET_INIT(printk_log.ts_nsec, "printk_log", "ts_nsec");
OFFSET_INIT(printk_log.len, "printk_log", "len");
OFFSET_INIT(printk_log.text_len, "printk_log", "text_len");
} else {
+ info->flag_use_printk_ringbuffer = FALSE;
info->flag_use_printk_log = FALSE;
SIZE_INIT(printk_log, "log");
OFFSET_INIT(printk_log.ts_nsec, "log", "ts_nsec");
@@ -2191,6 +2223,7 @@ write_vmcoreinfo_data(void)
WRITE_SYMBOL("node_data", node_data);
WRITE_SYMBOL("pgdat_list", pgdat_list);
WRITE_SYMBOL("contig_page_data", contig_page_data);
+ WRITE_SYMBOL("prb", prb);
WRITE_SYMBOL("log_buf", log_buf);
WRITE_SYMBOL("log_buf_len", log_buf_len);
WRITE_SYMBOL("log_end", log_end);
@@ -2222,7 +2255,11 @@ write_vmcoreinfo_data(void)
WRITE_STRUCTURE_SIZE("node_memblk_s", node_memblk_s);
WRITE_STRUCTURE_SIZE("nodemask_t", nodemask_t);
WRITE_STRUCTURE_SIZE("pageflags", pageflags);
- if (info->flag_use_printk_log)
+ if (info->flag_use_printk_ringbuffer) {
+ WRITE_STRUCTURE_SIZE("printk_ringbuffer", printk_ringbuffer);
+ WRITE_STRUCTURE_SIZE("prb_desc", prb_desc);
+ WRITE_STRUCTURE_SIZE("printk_info", printk_info);
+ } else if (info->flag_use_printk_log)
WRITE_STRUCTURE_SIZE("printk_log", printk_log);
else
WRITE_STRUCTURE_SIZE("log", printk_log);
@@ -2268,7 +2305,30 @@ write_vmcoreinfo_data(void)
WRITE_MEMBER_OFFSET("vm_struct.addr", vm_struct.addr);
WRITE_MEMBER_OFFSET("vmap_area.va_start", vmap_area.va_start);
WRITE_MEMBER_OFFSET("vmap_area.list", vmap_area.list);
- if (info->flag_use_printk_log) {
+ if (info->flag_use_printk_ringbuffer) {
+ WRITE_MEMBER_OFFSET("printk_ringbuffer.desc_ring", printk_ringbuffer.desc_ring);
+ WRITE_MEMBER_OFFSET("printk_ringbuffer.text_data_ring", printk_ringbuffer.text_data_ring);
+
+ WRITE_MEMBER_OFFSET("prb_desc_ring.count_bits", prb_desc_ring.count_bits);
+ WRITE_MEMBER_OFFSET("prb_desc_ring.descs", prb_desc_ring.descs);
+ WRITE_MEMBER_OFFSET("prb_desc_ring.infos", prb_desc_ring.infos);
+ WRITE_MEMBER_OFFSET("prb_desc_ring.head_id", prb_desc_ring.head_id);
+ WRITE_MEMBER_OFFSET("prb_desc_ring.tail_id", prb_desc_ring.tail_id);
+
+ WRITE_MEMBER_OFFSET("prb_desc.state_var", prb_desc.state_var);
+ WRITE_MEMBER_OFFSET("prb_desc.text_blk_lpos", prb_desc.text_blk_lpos);
+
+ WRITE_MEMBER_OFFSET("prb_data_blk_lpos.begin", prb_data_blk_lpos.begin);
+ WRITE_MEMBER_OFFSET("prb_data_blk_lpos.next", prb_data_blk_lpos.next);
+
+ WRITE_MEMBER_OFFSET("prb_data_ring.size_bits", prb_data_ring.size_bits);
+ WRITE_MEMBER_OFFSET("prb_data_ring.data", prb_data_ring.data);
+
+ WRITE_MEMBER_OFFSET("printk_info.ts_nsec", printk_info.ts_nsec);
+ WRITE_MEMBER_OFFSET("printk_info.text_len", printk_info.text_len);
+
+ WRITE_MEMBER_OFFSET("atomic_long_t.counter", atomic_long_t.counter);
+ } else if (info->flag_use_printk_log) {
WRITE_MEMBER_OFFSET("printk_log.ts_nsec", printk_log.ts_nsec);
WRITE_MEMBER_OFFSET("printk_log.len", printk_log.len);
WRITE_MEMBER_OFFSET("printk_log.text_len", printk_log.text_len);
@@ -2606,6 +2666,7 @@ read_vmcoreinfo(void)
READ_SYMBOL("node_data", node_data);
READ_SYMBOL("pgdat_list", pgdat_list);
READ_SYMBOL("contig_page_data", contig_page_data);
+ READ_SYMBOL("prb", prb);
READ_SYMBOL("log_buf", log_buf);
READ_SYMBOL("log_buf_len", log_buf_len);
READ_SYMBOL("log_end", log_end);
@@ -2684,12 +2745,43 @@ read_vmcoreinfo(void)
READ_MEMBER_OFFSET("cpu_spec.mmu_features", cpu_spec.mmu_features);
READ_STRUCTURE_SIZE("printk_log", printk_log);
- if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
+ READ_STRUCTURE_SIZE("printk_ringbuffer", printk_ringbuffer);
+ if (SIZE(printk_ringbuffer) != NOT_FOUND_STRUCTURE) {
+ info->flag_use_printk_ringbuffer = TRUE;
+ info->flag_use_printk_log = FALSE;
+
+ READ_MEMBER_OFFSET("printk_ringbuffer.desc_ring", printk_ringbuffer.desc_ring);
+ READ_MEMBER_OFFSET("printk_ringbuffer.text_data_ring", printk_ringbuffer.text_data_ring);
+
+ READ_MEMBER_OFFSET("prb_desc_ring.count_bits", prb_desc_ring.count_bits);
+ READ_MEMBER_OFFSET("prb_desc_ring.descs", prb_desc_ring.descs);
+ READ_MEMBER_OFFSET("prb_desc_ring.infos", prb_desc_ring.infos);
+ READ_MEMBER_OFFSET("prb_desc_ring.head_id", prb_desc_ring.head_id);
+ READ_MEMBER_OFFSET("prb_desc_ring.tail_id", prb_desc_ring.tail_id);
+
+ READ_STRUCTURE_SIZE("prb_desc", prb_desc);
+ READ_MEMBER_OFFSET("prb_desc.state_var", prb_desc.state_var);
+ READ_MEMBER_OFFSET("prb_desc.text_blk_lpos", prb_desc.text_blk_lpos);
+
+ READ_MEMBER_OFFSET("prb_data_blk_lpos.begin", prb_data_blk_lpos.begin);
+ READ_MEMBER_OFFSET("prb_data_blk_lpos.next", prb_data_blk_lpos.next);
+
+ READ_MEMBER_OFFSET("prb_data_ring.size_bits", prb_data_ring.size_bits);
+ READ_MEMBER_OFFSET("prb_data_ring.data", prb_data_ring.data);
+
+ READ_STRUCTURE_SIZE("printk_info", printk_info);
+ READ_MEMBER_OFFSET("printk_info.ts_nsec", printk_info.ts_nsec);
+ READ_MEMBER_OFFSET("printk_info.text_len", printk_info.text_len);
+
+ READ_MEMBER_OFFSET("atomic_long_t.counter", atomic_long_t.counter);
+ } else if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
+ info->flag_use_printk_ringbuffer = FALSE;
info->flag_use_printk_log = TRUE;
READ_MEMBER_OFFSET("printk_log.ts_nsec", printk_log.ts_nsec);
READ_MEMBER_OFFSET("printk_log.len", printk_log.len);
READ_MEMBER_OFFSET("printk_log.text_len", printk_log.text_len);
} else {
+ info->flag_use_printk_ringbuffer = FALSE;
info->flag_use_printk_log = FALSE;
READ_STRUCTURE_SIZE("log", printk_log);
READ_MEMBER_OFFSET("log.ts_nsec", printk_log.ts_nsec);
@@ -5286,6 +5378,9 @@ dump_dmesg()
if (!initial())
return FALSE;
+ if ((SYMBOL(prb) != NOT_FOUND_SYMBOL))
+ return dump_lockless_dmesg();
+
if ((SYMBOL(log_buf) == NOT_FOUND_SYMBOL)
|| (SYMBOL(log_buf_len) == NOT_FOUND_SYMBOL)) {
ERRMSG("Can't find some symbols for log_buf.\n");
diff --git a/makedumpfile-1.6.8/makedumpfile.h b/makedumpfile-1.6.8/makedumpfile.h
index 698c054..47f7e79 100644
--- a/makedumpfile-1.6.8/makedumpfile.h
+++ b/makedumpfile-1.6.8/makedumpfile.h
@@ -1317,6 +1317,7 @@ struct DumpInfo {
int flag_partial_dmesg; /* dmesg dump only from the last cleared index*/
int flag_mem_usage; /*show the page number of memory in different use*/
int flag_use_printk_log; /* did we read printk_log symbol name? */
+ int flag_use_printk_ringbuffer; /* using lockless printk ringbuffer? */
int flag_nospace; /* the flag of "No space on device" error */
int flag_vmemmap; /* kernel supports vmemmap address space */
int flag_excludevm; /* -e - excluding unused vmemmap pages */
@@ -1602,6 +1603,7 @@ struct symbol_table {
unsigned long long node_data;
unsigned long long pgdat_list;
unsigned long long contig_page_data;
+ unsigned long long prb;
unsigned long long log_buf;
unsigned long long log_buf_len;
unsigned long long log_end;
@@ -1689,6 +1691,13 @@ struct size_table {
long nodemask_t;
long printk_log;
+ /*
+ * for lockless printk ringbuffer
+ */
+ long printk_ringbuffer;
+ long prb_desc;
+ long printk_info;
+
/*
* for Xen extraction
*/
@@ -1864,6 +1873,52 @@ struct offset_table {
long text_len;
} printk_log;
+ /*
+ * for lockless printk ringbuffer
+ */
+ struct printk_ringbuffer_s {
+ long desc_ring;
+ long text_data_ring;
+ long fail;
+ } printk_ringbuffer;
+
+ struct prb_desc_ring_s {
+ long count_bits;
+ long descs;
+ long infos;
+ long head_id;
+ long tail_id;
+ } prb_desc_ring;
+
+ struct prb_desc_s {
+ long state_var;
+ long text_blk_lpos;
+ } prb_desc;
+
+ struct prb_data_blk_lpos_s {
+ long begin;
+ long next;
+ } prb_data_blk_lpos;
+
+ struct printk_info_s {
+ long seq;
+ long ts_nsec;
+ long text_len;
+ long caller_id;
+ long dev_info;
+ } printk_info;
+
+ struct prb_data_ring_s {
+ long size_bits;
+ long data;
+ long head_lpos;
+ long tail_lpos;
+ } prb_data_ring;
+
+ struct atomic_long_t_s {
+ long counter;
+ } atomic_long_t;
+
/*
* symbols on ppc64 arch
*/
@@ -2390,4 +2445,7 @@ int hexadecimal(char *s, int count);
int decimal(char *s, int count);
int file_exists(char *file);
+int open_dump_file(void);
+int dump_lockless_dmesg(void);
+
#endif /* MAKEDUMPFILE_H */
diff --git a/makedumpfile-1.6.8/printk.c b/makedumpfile-1.6.8/printk.c
new file mode 100644
index 0000000..acffb6c
--- /dev/null
+++ b/makedumpfile-1.6.8/printk.c
@@ -0,0 +1,207 @@
+#include "makedumpfile.h"
+#include <ctype.h>
+
+#define DESC_SV_BITS (sizeof(unsigned long) * 8)
+#define DESC_COMMITTED_MASK (1UL << (DESC_SV_BITS - 1))
+#define DESC_REUSE_MASK (1UL << (DESC_SV_BITS - 2))
+#define DESC_FLAGS_MASK (DESC_COMMITTED_MASK | DESC_REUSE_MASK)
+#define DESC_ID_MASK (~DESC_FLAGS_MASK)
+
+/* convenience struct for passing many values to helper functions */
+struct prb_map {
+ char *prb;
+
+ char *desc_ring;
+ unsigned long desc_ring_count;
+ char *descs;
+ char *infos;
+
+ char *text_data_ring;
+ unsigned long text_data_ring_size;
+ char *text_data;
+};
+
+static void
+dump_record(struct prb_map *m, unsigned long id)
+{
+ unsigned long long ts_nsec;
+ unsigned long state_var;
+ unsigned short text_len;
+ unsigned long begin;
+ unsigned long next;
+ char buf[BUFSIZE];
+ ulonglong nanos;
+ int indent_len;
+ int buf_need;
+ char *bufp;
+ char *text;
+ char *desc;
+ char *inf;
+ ulong rem;
+ char *p;
+ int i;
+
+ desc = m->descs + ((id % m->desc_ring_count) * SIZE(prb_desc));
+
+ /* skip non-committed record */
+ state_var = ULONG(desc + OFFSET(prb_desc.state_var) + OFFSET(atomic_long_t.counter));
+ if ((state_var & DESC_FLAGS_MASK) != DESC_COMMITTED_MASK)
+ return;
+
+ begin = ULONG(desc + OFFSET(prb_desc.text_blk_lpos) + OFFSET(prb_data_blk_lpos.begin)) %
+ m->text_data_ring_size;
+ next = ULONG(desc + OFFSET(prb_desc.text_blk_lpos) + OFFSET(prb_data_blk_lpos.next)) %
+ m->text_data_ring_size;
+
+ /* skip data-less text blocks */
+ if (begin == next)
+ return;
+
+ inf = m->infos + ((id % m->desc_ring_count) * SIZE(printk_info));
+
+ text_len = USHORT(inf + OFFSET(printk_info.text_len));
+
+ /* handle wrapping data block */
+ if (begin > next)
+ begin = 0;
+
+ /* skip over descriptor ID */
+ begin += sizeof(unsigned long);
+
+ /* handle truncated messages */
+ if (next - begin < text_len)
+ text_len = next - begin;
+
+ text = m->text_data + begin;
+
+ ts_nsec = ULONGLONG(inf + OFFSET(printk_info.ts_nsec));
+ nanos = (ulonglong)ts_nsec / (ulonglong)1000000000;
+ rem = (ulonglong)ts_nsec % (ulonglong)1000000000;
+
+ bufp = buf;
+ bufp += sprintf(buf, "[%5lld.%06ld] ", nanos, rem/1000);
+ indent_len = strlen(buf);
+
+ /* How much buffer space is needed in the worst case */
+ buf_need = MAX(sizeof("\\xXX\n"), sizeof("\n") + indent_len);
+
+ for (i = 0, p = text; i < text_len; i++, p++) {
+ if (bufp - buf >= sizeof(buf) - buf_need) {
+ if (write(info->fd_dumpfile, buf, bufp - buf) < 0)
+ return;
+ bufp = buf;
+ }
+
+ if (*p == '\n')
+ bufp += sprintf(bufp, "\n%-*s", indent_len, "");
+ else if (isprint(*p) || isspace(*p))
+ *bufp++ = *p;
+ else
+ bufp += sprintf(bufp, "\\x%02x", *p);
+ }
+
+ *bufp++ = '\n';
+
+ write(info->fd_dumpfile, buf, bufp - buf);
+}
+
+int
+dump_lockless_dmesg(void)
+{
+ unsigned long head_id;
+ unsigned long tail_id;
+ unsigned long kaddr;
+ unsigned long id;
+ struct prb_map m;
+ int ret = FALSE;
+
+ /* setup printk_ringbuffer */
+ if (!readmem(VADDR, SYMBOL(prb), &kaddr, sizeof(kaddr))) {
+ ERRMSG("Can't get the prb address.\n");
+ return ret;
+ }
+
+ m.prb = malloc(SIZE(printk_ringbuffer));
+ if (!m.prb) {
+ ERRMSG("Can't allocate memory for prb.\n");
+ return ret;
+ }
+ if (!readmem(VADDR, kaddr, m.prb, SIZE(printk_ringbuffer))) {
+ ERRMSG("Can't get prb.\n");
+ goto out_prb;
+ }
+
+ /* setup descriptor ring */
+ m.desc_ring = m.prb + OFFSET(printk_ringbuffer.desc_ring);
+ m.desc_ring_count = 1 << UINT(m.desc_ring + OFFSET(prb_desc_ring.count_bits));
+
+ kaddr = ULONG(m.desc_ring + OFFSET(prb_desc_ring.descs));
+ m.descs = malloc(SIZE(prb_desc) * m.desc_ring_count);
+ if (!m.descs) {
+ ERRMSG("Can't allocate memory for prb.desc_ring.descs.\n");
+ goto out_prb;
+ }
+ if (!readmem(VADDR, kaddr, m.descs,
+ SIZE(prb_desc) * m.desc_ring_count)) {
+ ERRMSG("Can't get prb.desc_ring.descs.\n");
+ goto out_descs;
+ }
+
+ kaddr = ULONG(m.desc_ring + OFFSET(prb_desc_ring.infos));
+ m.infos = malloc(SIZE(printk_info) * m.desc_ring_count);
+ if (!m.infos) {
+ ERRMSG("Can't allocate memory for prb.desc_ring.infos.\n");
+ goto out_descs;
+ }
+ if (!readmem(VADDR, kaddr, m.infos, SIZE(printk_info) * m.desc_ring_count)) {
+ ERRMSG("Can't get prb.desc_ring.infos.\n");
+ goto out_infos;
+ }
+
+ /* setup text data ring */
+ m.text_data_ring = m.prb + OFFSET(printk_ringbuffer.text_data_ring);
+ m.text_data_ring_size = 1 << UINT(m.text_data_ring + OFFSET(prb_data_ring.size_bits));
+
+ kaddr = ULONG(m.text_data_ring + OFFSET(prb_data_ring.data));
+ m.text_data = malloc(m.text_data_ring_size);
+ if (!m.text_data) {
+ ERRMSG("Can't allocate memory for prb.text_data_ring.data.\n");
+ goto out_infos;
+ }
+ if (!readmem(VADDR, kaddr, m.text_data, m.text_data_ring_size)) {
+ ERRMSG("Can't get prb.text_data_ring.\n");
+ goto out_text_data;
+ }
+
+ /* ready to go */
+
+ tail_id = ULONG(m.desc_ring + OFFSET(prb_desc_ring.tail_id) +
+ OFFSET(atomic_long_t.counter));
+ head_id = ULONG(m.desc_ring + OFFSET(prb_desc_ring.head_id) +
+ OFFSET(atomic_long_t.counter));
+
+ if (!open_dump_file()) {
+ ERRMSG("Can't open output file.\n");
+ goto out_text_data;
+ }
+
+ for (id = tail_id; id != head_id; id = (id + 1) & DESC_ID_MASK)
+ dump_record(&m, id);
+
+ /* dump head record */
+ dump_record(&m, id);
+
+ if (!close_files_for_creating_dumpfile())
+ goto out_text_data;
+
+ ret = TRUE;
+out_text_data:
+ free(m.text_data);
+out_infos:
+ free(m.infos);
+out_descs:
+ free(m.descs);
+out_prb:
+ free(m.prb);
+ return ret;
+}
--
2.29.2
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