Blame kexec-tools-2.0.20-makedumpfile-printk-add-support-for-lockless-ringbuffer.patch

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From c617ec63339222f3a44d73e36677a9acc8954ccd Mon Sep 17 00:00:00 2001
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From: John Ogness <john.ogness@linutronix.de>
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Date: Thu, 19 Nov 2020 02:41:21 +0000
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Subject: [PATCH 1/2] [PATCH 1/2] printk: add support for lockless ringbuffer
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* Required for kernel 5.10
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Linux 5.10 introduces a new lockless ringbuffer. The new ringbuffer
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is structured completely different to the previous iterations.
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Add support for retrieving the ringbuffer from debug information
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and/or using vmcoreinfo. The new ringbuffer is detected based on
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the availability of the "prb" symbol.
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Signed-off-by: John Ogness <john.ogness@linutronix.de>
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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 Makefile       |   2 +-
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 dwarf_info.c   |  36 ++++++++-
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 makedumpfile.c | 103 +++++++++++++++++++++++-
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 makedumpfile.h |  58 ++++++++++++++
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 printk.c       | 207 +++++++++++++++++++++++++++++++++++++++++++++++++
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 5 files changed, 399 insertions(+), 7 deletions(-)
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 create mode 100644 printk.c
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diff --git a/makedumpfile-1.6.8/Makefile b/makedumpfile-1.6.8/Makefile
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index e5ac71a..cb6bd42 100644
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--- a/makedumpfile-1.6.8/Makefile
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+++ b/makedumpfile-1.6.8/Makefile
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@@ -45,7 +45,7 @@ CFLAGS_ARCH += -m32
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 endif
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 SRC_BASE = makedumpfile.c makedumpfile.h diskdump_mod.h sadump_mod.h sadump_info.h
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-SRC_PART = print_info.c dwarf_info.c elf_info.c erase_info.c sadump_info.c cache.c tools.c
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+SRC_PART = print_info.c dwarf_info.c elf_info.c erase_info.c sadump_info.c cache.c tools.c printk.c
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 OBJ_PART=$(patsubst %.c,%.o,$(SRC_PART))
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 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
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 OBJ_ARCH=$(patsubst %.c,%.o,$(SRC_ARCH))
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diff --git a/makedumpfile-1.6.8/dwarf_info.c b/makedumpfile-1.6.8/dwarf_info.c
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index e42a9f5..543588b 100644
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--- a/makedumpfile-1.6.8/dwarf_info.c
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+++ b/makedumpfile-1.6.8/dwarf_info.c
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@@ -614,6 +614,7 @@ search_structure(Dwarf_Die *die, int *found)
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 {
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 	int tag;
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 	const char *name;
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+	Dwarf_Die die_type;
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 	/*
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 	 * If we get to here then we don't have any more
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@@ -622,9 +623,31 @@ search_structure(Dwarf_Die *die, int *found)
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 	do {
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 		tag  = dwarf_tag(die);
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 		name = dwarf_diename(die);
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-		if ((tag != DW_TAG_structure_type) || (!name)
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-		    || strcmp(name, dwarf_info.struct_name))
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+		if ((!name) || strcmp(name, dwarf_info.struct_name))
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+			continue;
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+
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+		if (tag == DW_TAG_typedef) {
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+			if (!get_die_type(die, &die_type)) {
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+				ERRMSG("Can't get CU die of DW_AT_type.\n");
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+				break;
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+			}
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+
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+			/* Resolve typedefs of typedefs. */
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+			while ((tag = dwarf_tag(&die_type)) == DW_TAG_typedef) {
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+				if (!get_die_type(&die_type, &die_type)) {
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+					ERRMSG("Can't get CU die of DW_AT_type.\n");
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+					return;
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+				}
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+			}
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+
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+			if (tag != DW_TAG_structure_type)
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+				continue;
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+			die = &die_type;
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+
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+		} else if (tag != DW_TAG_structure_type) {
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 			continue;
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+		}
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+
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 		/*
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 		 * Skip if DW_AT_byte_size is not included.
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 		 */
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@@ -740,6 +763,15 @@ search_typedef(Dwarf_Die *die, int *found)
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 				ERRMSG("Can't get CU die of DW_AT_type.\n");
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 				break;
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 			}
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+
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+			/* Resolve typedefs of typedefs. */
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+			while ((tag = dwarf_tag(&die_type)) == DW_TAG_typedef) {
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+				if (!get_die_type(&die_type, &die_type)) {
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+					ERRMSG("Can't get CU die of DW_AT_type.\n");
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+					return;
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+				}
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+			}
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+
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 			dwarf_info.struct_size = dwarf_bytesize(&die_type);
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 			if (dwarf_info.struct_size <= 0)
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 				continue;
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diff --git a/makedumpfile-1.6.8/makedumpfile.c b/makedumpfile-1.6.8/makedumpfile.c
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index cdde040..061741f 100644
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--- a/makedumpfile-1.6.8/makedumpfile.c
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+++ b/makedumpfile-1.6.8/makedumpfile.c
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@@ -1555,6 +1555,7 @@ get_symbol_info(void)
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 	SYMBOL_INIT(node_data, "node_data");
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 	SYMBOL_INIT(pgdat_list, "pgdat_list");
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 	SYMBOL_INIT(contig_page_data, "contig_page_data");
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+	SYMBOL_INIT(prb, "prb");
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 	SYMBOL_INIT(log_buf, "log_buf");
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 	SYMBOL_INIT(log_buf_len, "log_buf_len");
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 	SYMBOL_INIT(log_end, "log_end");
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@@ -1971,16 +1972,47 @@ get_structure_info(void)
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 	OFFSET_INIT(elf64_phdr.p_memsz, "elf64_phdr", "p_memsz");
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 	SIZE_INIT(printk_log, "printk_log");
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-	if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
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+	SIZE_INIT(printk_ringbuffer, "printk_ringbuffer");
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+	if ((SIZE(printk_ringbuffer) != NOT_FOUND_STRUCTURE)) {
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+		info->flag_use_printk_ringbuffer = TRUE;
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+		info->flag_use_printk_log = FALSE;
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+
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+		OFFSET_INIT(printk_ringbuffer.desc_ring, "printk_ringbuffer", "desc_ring");
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+		OFFSET_INIT(printk_ringbuffer.text_data_ring, "printk_ringbuffer", "text_data_ring");
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+
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+		OFFSET_INIT(prb_desc_ring.count_bits, "prb_desc_ring", "count_bits");
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+		OFFSET_INIT(prb_desc_ring.descs, "prb_desc_ring", "descs");
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+		OFFSET_INIT(prb_desc_ring.infos, "prb_desc_ring", "infos");
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+		OFFSET_INIT(prb_desc_ring.head_id, "prb_desc_ring", "head_id");
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+		OFFSET_INIT(prb_desc_ring.tail_id, "prb_desc_ring", "tail_id");
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+
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+		SIZE_INIT(prb_desc, "prb_desc");
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+		OFFSET_INIT(prb_desc.state_var, "prb_desc", "state_var");
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+		OFFSET_INIT(prb_desc.text_blk_lpos, "prb_desc", "text_blk_lpos");
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+
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+		OFFSET_INIT(prb_data_blk_lpos.begin, "prb_data_blk_lpos", "begin");
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+		OFFSET_INIT(prb_data_blk_lpos.next, "prb_data_blk_lpos", "next");
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+
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+		OFFSET_INIT(prb_data_ring.size_bits, "prb_data_ring", "size_bits");
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+		OFFSET_INIT(prb_data_ring.data, "prb_data_ring", "data");
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+
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+		SIZE_INIT(printk_info, "printk_info");
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+		OFFSET_INIT(printk_info.ts_nsec, "printk_info", "ts_nsec");
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+		OFFSET_INIT(printk_info.text_len, "printk_info", "text_len");
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+
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+		OFFSET_INIT(atomic_long_t.counter, "atomic_long_t", "counter");
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+	} else if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
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 		/*
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 		 * In kernel 3.11-rc4 the log structure name was renamed
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 		 * to "printk_log".
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 		 */
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+		info->flag_use_printk_ringbuffer = FALSE;
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 		info->flag_use_printk_log = TRUE;
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 		OFFSET_INIT(printk_log.ts_nsec, "printk_log", "ts_nsec");
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 		OFFSET_INIT(printk_log.len, "printk_log", "len");
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 		OFFSET_INIT(printk_log.text_len, "printk_log", "text_len");
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 	} else {
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+		info->flag_use_printk_ringbuffer = FALSE;
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 		info->flag_use_printk_log = FALSE;
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 		SIZE_INIT(printk_log, "log");
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 		OFFSET_INIT(printk_log.ts_nsec, "log", "ts_nsec");
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@@ -2191,6 +2223,7 @@ write_vmcoreinfo_data(void)
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 	WRITE_SYMBOL("node_data", node_data);
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 	WRITE_SYMBOL("pgdat_list", pgdat_list);
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 	WRITE_SYMBOL("contig_page_data", contig_page_data);
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+	WRITE_SYMBOL("prb", prb);
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 	WRITE_SYMBOL("log_buf", log_buf);
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 	WRITE_SYMBOL("log_buf_len", log_buf_len);
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 	WRITE_SYMBOL("log_end", log_end);
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@@ -2222,7 +2255,11 @@ write_vmcoreinfo_data(void)
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 	WRITE_STRUCTURE_SIZE("node_memblk_s", node_memblk_s);
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 	WRITE_STRUCTURE_SIZE("nodemask_t", nodemask_t);
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 	WRITE_STRUCTURE_SIZE("pageflags", pageflags);
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-	if (info->flag_use_printk_log)
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+	if (info->flag_use_printk_ringbuffer) {
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+		WRITE_STRUCTURE_SIZE("printk_ringbuffer", printk_ringbuffer);
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+		WRITE_STRUCTURE_SIZE("prb_desc", prb_desc);
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+		WRITE_STRUCTURE_SIZE("printk_info", printk_info);
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+	} else if (info->flag_use_printk_log)
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 		WRITE_STRUCTURE_SIZE("printk_log", printk_log);
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 	else
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 		WRITE_STRUCTURE_SIZE("log", printk_log);
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@@ -2268,7 +2305,30 @@ write_vmcoreinfo_data(void)
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 	WRITE_MEMBER_OFFSET("vm_struct.addr", vm_struct.addr);
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 	WRITE_MEMBER_OFFSET("vmap_area.va_start", vmap_area.va_start);
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 	WRITE_MEMBER_OFFSET("vmap_area.list", vmap_area.list);
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-	if (info->flag_use_printk_log) {
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+	if (info->flag_use_printk_ringbuffer) {
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+		WRITE_MEMBER_OFFSET("printk_ringbuffer.desc_ring", printk_ringbuffer.desc_ring);
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+		WRITE_MEMBER_OFFSET("printk_ringbuffer.text_data_ring", printk_ringbuffer.text_data_ring);
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+
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+		WRITE_MEMBER_OFFSET("prb_desc_ring.count_bits", prb_desc_ring.count_bits);
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+		WRITE_MEMBER_OFFSET("prb_desc_ring.descs", prb_desc_ring.descs);
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+		WRITE_MEMBER_OFFSET("prb_desc_ring.infos", prb_desc_ring.infos);
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+		WRITE_MEMBER_OFFSET("prb_desc_ring.head_id", prb_desc_ring.head_id);
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+		WRITE_MEMBER_OFFSET("prb_desc_ring.tail_id", prb_desc_ring.tail_id);
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+
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+		WRITE_MEMBER_OFFSET("prb_desc.state_var", prb_desc.state_var);
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+		WRITE_MEMBER_OFFSET("prb_desc.text_blk_lpos", prb_desc.text_blk_lpos);
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+
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+		WRITE_MEMBER_OFFSET("prb_data_blk_lpos.begin", prb_data_blk_lpos.begin);
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+		WRITE_MEMBER_OFFSET("prb_data_blk_lpos.next", prb_data_blk_lpos.next);
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+
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+		WRITE_MEMBER_OFFSET("prb_data_ring.size_bits", prb_data_ring.size_bits);
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+		WRITE_MEMBER_OFFSET("prb_data_ring.data", prb_data_ring.data);
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+
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+		WRITE_MEMBER_OFFSET("printk_info.ts_nsec", printk_info.ts_nsec);
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+		WRITE_MEMBER_OFFSET("printk_info.text_len", printk_info.text_len);
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+
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+		WRITE_MEMBER_OFFSET("atomic_long_t.counter", atomic_long_t.counter);
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+	} else if (info->flag_use_printk_log) {
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 		WRITE_MEMBER_OFFSET("printk_log.ts_nsec", printk_log.ts_nsec);
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 		WRITE_MEMBER_OFFSET("printk_log.len", printk_log.len);
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 		WRITE_MEMBER_OFFSET("printk_log.text_len", printk_log.text_len);
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@@ -2606,6 +2666,7 @@ read_vmcoreinfo(void)
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 	READ_SYMBOL("node_data", node_data);
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 	READ_SYMBOL("pgdat_list", pgdat_list);
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 	READ_SYMBOL("contig_page_data", contig_page_data);
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+	READ_SYMBOL("prb", prb);
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 	READ_SYMBOL("log_buf", log_buf);
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 	READ_SYMBOL("log_buf_len", log_buf_len);
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 	READ_SYMBOL("log_end", log_end);
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@@ -2684,12 +2745,43 @@ read_vmcoreinfo(void)
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 	READ_MEMBER_OFFSET("cpu_spec.mmu_features", cpu_spec.mmu_features);
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 	READ_STRUCTURE_SIZE("printk_log", printk_log);
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-	if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
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+	READ_STRUCTURE_SIZE("printk_ringbuffer", printk_ringbuffer);
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+	if (SIZE(printk_ringbuffer) != NOT_FOUND_STRUCTURE) {
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+		info->flag_use_printk_ringbuffer = TRUE;
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+		info->flag_use_printk_log = FALSE;
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+
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+		READ_MEMBER_OFFSET("printk_ringbuffer.desc_ring", printk_ringbuffer.desc_ring);
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+		READ_MEMBER_OFFSET("printk_ringbuffer.text_data_ring", printk_ringbuffer.text_data_ring);
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+
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+		READ_MEMBER_OFFSET("prb_desc_ring.count_bits", prb_desc_ring.count_bits);
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+		READ_MEMBER_OFFSET("prb_desc_ring.descs", prb_desc_ring.descs);
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+		READ_MEMBER_OFFSET("prb_desc_ring.infos", prb_desc_ring.infos);
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+		READ_MEMBER_OFFSET("prb_desc_ring.head_id", prb_desc_ring.head_id);
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+		READ_MEMBER_OFFSET("prb_desc_ring.tail_id", prb_desc_ring.tail_id);
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+
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+		READ_STRUCTURE_SIZE("prb_desc", prb_desc);
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+		READ_MEMBER_OFFSET("prb_desc.state_var", prb_desc.state_var);
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+		READ_MEMBER_OFFSET("prb_desc.text_blk_lpos", prb_desc.text_blk_lpos);
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+
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+		READ_MEMBER_OFFSET("prb_data_blk_lpos.begin", prb_data_blk_lpos.begin);
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+		READ_MEMBER_OFFSET("prb_data_blk_lpos.next", prb_data_blk_lpos.next);
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+
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+		READ_MEMBER_OFFSET("prb_data_ring.size_bits", prb_data_ring.size_bits);
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+		READ_MEMBER_OFFSET("prb_data_ring.data", prb_data_ring.data);
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+
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+		READ_STRUCTURE_SIZE("printk_info", printk_info);
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+		READ_MEMBER_OFFSET("printk_info.ts_nsec", printk_info.ts_nsec);
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+		READ_MEMBER_OFFSET("printk_info.text_len", printk_info.text_len);
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+
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+		READ_MEMBER_OFFSET("atomic_long_t.counter", atomic_long_t.counter);
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+	} else if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
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+		info->flag_use_printk_ringbuffer = FALSE;
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 		info->flag_use_printk_log = TRUE;
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 		READ_MEMBER_OFFSET("printk_log.ts_nsec", printk_log.ts_nsec);
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 		READ_MEMBER_OFFSET("printk_log.len", printk_log.len);
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 		READ_MEMBER_OFFSET("printk_log.text_len", printk_log.text_len);
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 	} else {
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+		info->flag_use_printk_ringbuffer = FALSE;
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 		info->flag_use_printk_log = FALSE;
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 		READ_STRUCTURE_SIZE("log", printk_log);
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 		READ_MEMBER_OFFSET("log.ts_nsec", printk_log.ts_nsec);
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@@ -5286,6 +5378,9 @@ dump_dmesg()
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 	if (!initial())
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 		return FALSE;
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+	if ((SYMBOL(prb) != NOT_FOUND_SYMBOL))
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+		return dump_lockless_dmesg();
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+
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 	if ((SYMBOL(log_buf) == NOT_FOUND_SYMBOL)
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 	    || (SYMBOL(log_buf_len) == NOT_FOUND_SYMBOL)) {
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 		ERRMSG("Can't find some symbols for log_buf.\n");
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diff --git a/makedumpfile-1.6.8/makedumpfile.h b/makedumpfile-1.6.8/makedumpfile.h
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index 698c054..47f7e79 100644
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--- a/makedumpfile-1.6.8/makedumpfile.h
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+++ b/makedumpfile-1.6.8/makedumpfile.h
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@@ -1317,6 +1317,7 @@ struct DumpInfo {
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 	int             flag_partial_dmesg;  /* dmesg dump only from the last cleared index*/
DistroBaker 7d0122
 	int             flag_mem_usage;  /*show the page number of memory in different use*/
DistroBaker 7d0122
 	int		flag_use_printk_log; /* did we read printk_log symbol name? */
DistroBaker 7d0122
+	int		flag_use_printk_ringbuffer; /* using lockless printk ringbuffer? */
DistroBaker 7d0122
 	int		flag_nospace;	     /* the flag of "No space on device" error */
DistroBaker 7d0122
 	int		flag_vmemmap;        /* kernel supports vmemmap address space */
DistroBaker 7d0122
 	int		flag_excludevm;      /* -e - excluding unused vmemmap pages */
DistroBaker 7d0122
@@ -1602,6 +1603,7 @@ struct symbol_table {
DistroBaker 7d0122
 	unsigned long long	node_data;
DistroBaker 7d0122
 	unsigned long long	pgdat_list;
DistroBaker 7d0122
 	unsigned long long	contig_page_data;
DistroBaker 7d0122
+	unsigned long long	prb;
DistroBaker 7d0122
 	unsigned long long	log_buf;
DistroBaker 7d0122
 	unsigned long long	log_buf_len;
DistroBaker 7d0122
 	unsigned long long	log_end;
DistroBaker 7d0122
@@ -1689,6 +1691,13 @@ struct size_table {
DistroBaker 7d0122
 	long	nodemask_t;
DistroBaker 7d0122
 	long	printk_log;
DistroBaker 7d0122
 
DistroBaker 7d0122
+	/*
DistroBaker 7d0122
+	 * for lockless printk ringbuffer
DistroBaker 7d0122
+	 */
DistroBaker 7d0122
+	long	printk_ringbuffer;
DistroBaker 7d0122
+	long	prb_desc;
DistroBaker 7d0122
+	long	printk_info;
DistroBaker 7d0122
+
DistroBaker 7d0122
 	/*
DistroBaker 7d0122
 	 * for Xen extraction
DistroBaker 7d0122
 	 */
DistroBaker 7d0122
@@ -1864,6 +1873,52 @@ struct offset_table {
DistroBaker 7d0122
 		long text_len;
DistroBaker 7d0122
 	} printk_log;
DistroBaker 7d0122
 
DistroBaker 7d0122
+	/*
DistroBaker 7d0122
+	 * for lockless printk ringbuffer
DistroBaker 7d0122
+	 */
DistroBaker 7d0122
+	struct printk_ringbuffer_s {
DistroBaker 7d0122
+		long desc_ring;
DistroBaker 7d0122
+		long text_data_ring;
DistroBaker 7d0122
+		long fail;
DistroBaker 7d0122
+	} printk_ringbuffer;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	struct prb_desc_ring_s {
DistroBaker 7d0122
+		long count_bits;
DistroBaker 7d0122
+		long descs;
DistroBaker 7d0122
+		long infos;
DistroBaker 7d0122
+		long head_id;
DistroBaker 7d0122
+		long tail_id;
DistroBaker 7d0122
+	} prb_desc_ring;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	struct prb_desc_s {
DistroBaker 7d0122
+		long state_var;
DistroBaker 7d0122
+		long text_blk_lpos;
DistroBaker 7d0122
+	} prb_desc;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	struct prb_data_blk_lpos_s {
DistroBaker 7d0122
+		long begin;
DistroBaker 7d0122
+		long next;
DistroBaker 7d0122
+	} prb_data_blk_lpos;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	struct printk_info_s {
DistroBaker 7d0122
+		long seq;
DistroBaker 7d0122
+		long ts_nsec;
DistroBaker 7d0122
+		long text_len;
DistroBaker 7d0122
+		long caller_id;
DistroBaker 7d0122
+		long dev_info;
DistroBaker 7d0122
+	} printk_info;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	struct prb_data_ring_s {
DistroBaker 7d0122
+		long size_bits;
DistroBaker 7d0122
+		long data;
DistroBaker 7d0122
+		long head_lpos;
DistroBaker 7d0122
+		long tail_lpos;
DistroBaker 7d0122
+	} prb_data_ring;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	struct atomic_long_t_s {
DistroBaker 7d0122
+		long counter;
DistroBaker 7d0122
+	} atomic_long_t;
DistroBaker 7d0122
+
DistroBaker 7d0122
 	/*
DistroBaker 7d0122
 	 * symbols on ppc64 arch
DistroBaker 7d0122
 	 */
DistroBaker 7d0122
@@ -2390,4 +2445,7 @@ int hexadecimal(char *s, int count);
DistroBaker 7d0122
 int decimal(char *s, int count);
DistroBaker 7d0122
 int file_exists(char *file);
DistroBaker 7d0122
 
DistroBaker 7d0122
+int open_dump_file(void);
DistroBaker 7d0122
+int dump_lockless_dmesg(void);
DistroBaker 7d0122
+
DistroBaker 7d0122
 #endif /* MAKEDUMPFILE_H */
DistroBaker 7d0122
diff --git a/makedumpfile-1.6.8/printk.c b/makedumpfile-1.6.8/printk.c
DistroBaker 7d0122
new file mode 100644
DistroBaker 7d0122
index 0000000..acffb6c
DistroBaker 7d0122
--- /dev/null
DistroBaker 7d0122
+++ b/makedumpfile-1.6.8/printk.c
DistroBaker 7d0122
@@ -0,0 +1,207 @@
DistroBaker 7d0122
+#include "makedumpfile.h"
DistroBaker 7d0122
+#include <ctype.h>
DistroBaker 7d0122
+
DistroBaker 7d0122
+#define DESC_SV_BITS		(sizeof(unsigned long) * 8)
DistroBaker 7d0122
+#define DESC_COMMITTED_MASK	(1UL << (DESC_SV_BITS - 1))
DistroBaker 7d0122
+#define DESC_REUSE_MASK		(1UL << (DESC_SV_BITS - 2))
DistroBaker 7d0122
+#define DESC_FLAGS_MASK		(DESC_COMMITTED_MASK | DESC_REUSE_MASK)
DistroBaker 7d0122
+#define DESC_ID_MASK		(~DESC_FLAGS_MASK)
DistroBaker 7d0122
+
DistroBaker 7d0122
+/* convenience struct for passing many values to helper functions */
DistroBaker 7d0122
+struct prb_map {
DistroBaker 7d0122
+	char		*prb;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	char		*desc_ring;
DistroBaker 7d0122
+	unsigned long	desc_ring_count;
DistroBaker 7d0122
+	char		*descs;
DistroBaker 7d0122
+	char		*infos;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	char		*text_data_ring;
DistroBaker 7d0122
+	unsigned long	text_data_ring_size;
DistroBaker 7d0122
+	char		*text_data;
DistroBaker 7d0122
+};
DistroBaker 7d0122
+
DistroBaker 7d0122
+static void
DistroBaker 7d0122
+dump_record(struct prb_map *m, unsigned long id)
DistroBaker 7d0122
+{
DistroBaker 7d0122
+	unsigned long long ts_nsec;
DistroBaker 7d0122
+	unsigned long state_var;
DistroBaker 7d0122
+	unsigned short text_len;
DistroBaker 7d0122
+	unsigned long begin;
DistroBaker 7d0122
+	unsigned long next;
DistroBaker 7d0122
+	char buf[BUFSIZE];
DistroBaker 7d0122
+	ulonglong nanos;
DistroBaker 7d0122
+	int indent_len;
DistroBaker 7d0122
+	int buf_need;
DistroBaker 7d0122
+	char *bufp;
DistroBaker 7d0122
+	char *text;
DistroBaker 7d0122
+	char *desc;
DistroBaker 7d0122
+	char *inf;
DistroBaker 7d0122
+	ulong rem;
DistroBaker 7d0122
+	char *p;
DistroBaker 7d0122
+	int i;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	desc = m->descs + ((id % m->desc_ring_count) * SIZE(prb_desc));
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* skip non-committed record */
DistroBaker 7d0122
+	state_var = ULONG(desc + OFFSET(prb_desc.state_var) + OFFSET(atomic_long_t.counter));
DistroBaker 7d0122
+	if ((state_var & DESC_FLAGS_MASK) != DESC_COMMITTED_MASK)
DistroBaker 7d0122
+		return;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	begin = ULONG(desc + OFFSET(prb_desc.text_blk_lpos) + OFFSET(prb_data_blk_lpos.begin)) %
DistroBaker 7d0122
+			m->text_data_ring_size;
DistroBaker 7d0122
+	next = ULONG(desc + OFFSET(prb_desc.text_blk_lpos) + OFFSET(prb_data_blk_lpos.next)) %
DistroBaker 7d0122
+			m->text_data_ring_size;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* skip data-less text blocks */
DistroBaker 7d0122
+	if (begin == next)
DistroBaker 7d0122
+		return;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	inf = m->infos + ((id % m->desc_ring_count) * SIZE(printk_info));
DistroBaker 7d0122
+
DistroBaker 7d0122
+	text_len = USHORT(inf + OFFSET(printk_info.text_len));
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* handle wrapping data block */
DistroBaker 7d0122
+	if (begin > next)
DistroBaker 7d0122
+		begin = 0;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* skip over descriptor ID */
DistroBaker 7d0122
+	begin += sizeof(unsigned long);
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* handle truncated messages */
DistroBaker 7d0122
+	if (next - begin < text_len)
DistroBaker 7d0122
+		text_len = next - begin;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	text = m->text_data + begin;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	ts_nsec = ULONGLONG(inf + OFFSET(printk_info.ts_nsec));
DistroBaker 7d0122
+	nanos = (ulonglong)ts_nsec / (ulonglong)1000000000;
DistroBaker 7d0122
+	rem = (ulonglong)ts_nsec % (ulonglong)1000000000;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	bufp = buf;
DistroBaker 7d0122
+	bufp += sprintf(buf, "[%5lld.%06ld] ", nanos, rem/1000);
DistroBaker 7d0122
+	indent_len = strlen(buf);
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* How much buffer space is needed in the worst case */
DistroBaker 7d0122
+	buf_need = MAX(sizeof("\\xXX\n"), sizeof("\n") + indent_len);
DistroBaker 7d0122
+
DistroBaker 7d0122
+	for (i = 0, p = text; i < text_len; i++, p++) {
DistroBaker 7d0122
+		if (bufp - buf >= sizeof(buf) - buf_need) {
DistroBaker 7d0122
+			if (write(info->fd_dumpfile, buf, bufp - buf) < 0)
DistroBaker 7d0122
+				return;
DistroBaker 7d0122
+			bufp = buf;
DistroBaker 7d0122
+		}
DistroBaker 7d0122
+
DistroBaker 7d0122
+		if (*p == '\n')
DistroBaker 7d0122
+			bufp += sprintf(bufp, "\n%-*s", indent_len, "");
DistroBaker 7d0122
+		else if (isprint(*p) || isspace(*p))
DistroBaker 7d0122
+			*bufp++ = *p;
DistroBaker 7d0122
+		else
DistroBaker 7d0122
+			bufp += sprintf(bufp, "\\x%02x", *p);
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+
DistroBaker 7d0122
+	*bufp++ = '\n';
DistroBaker 7d0122
+
DistroBaker 7d0122
+	write(info->fd_dumpfile, buf, bufp - buf);
DistroBaker 7d0122
+}
DistroBaker 7d0122
+
DistroBaker 7d0122
+int
DistroBaker 7d0122
+dump_lockless_dmesg(void)
DistroBaker 7d0122
+{
DistroBaker 7d0122
+	unsigned long head_id;
DistroBaker 7d0122
+	unsigned long tail_id;
DistroBaker 7d0122
+	unsigned long kaddr;
DistroBaker 7d0122
+	unsigned long id;
DistroBaker 7d0122
+	struct prb_map m;
DistroBaker 7d0122
+	int ret = FALSE;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* setup printk_ringbuffer */
DistroBaker 7d0122
+	if (!readmem(VADDR, SYMBOL(prb), &kaddr, sizeof(kaddr))) {
DistroBaker 7d0122
+		ERRMSG("Can't get the prb address.\n");
DistroBaker 7d0122
+		return ret;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+
DistroBaker 7d0122
+	m.prb = malloc(SIZE(printk_ringbuffer));
DistroBaker 7d0122
+	if (!m.prb) {
DistroBaker 7d0122
+		ERRMSG("Can't allocate memory for prb.\n");
DistroBaker 7d0122
+		return ret;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+	if (!readmem(VADDR, kaddr, m.prb, SIZE(printk_ringbuffer))) {
DistroBaker 7d0122
+		ERRMSG("Can't get prb.\n");
DistroBaker 7d0122
+		goto out_prb;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* setup descriptor ring */
DistroBaker 7d0122
+	m.desc_ring = m.prb + OFFSET(printk_ringbuffer.desc_ring);
DistroBaker 7d0122
+	m.desc_ring_count = 1 << UINT(m.desc_ring + OFFSET(prb_desc_ring.count_bits));
DistroBaker 7d0122
+
DistroBaker 7d0122
+	kaddr = ULONG(m.desc_ring + OFFSET(prb_desc_ring.descs));
DistroBaker 7d0122
+	m.descs = malloc(SIZE(prb_desc) * m.desc_ring_count);
DistroBaker 7d0122
+	if (!m.descs) {
DistroBaker 7d0122
+		ERRMSG("Can't allocate memory for prb.desc_ring.descs.\n");
DistroBaker 7d0122
+		goto out_prb;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+	if (!readmem(VADDR, kaddr, m.descs,
DistroBaker 7d0122
+		     SIZE(prb_desc) * m.desc_ring_count)) {
DistroBaker 7d0122
+		ERRMSG("Can't get prb.desc_ring.descs.\n");
DistroBaker 7d0122
+		goto out_descs;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+
DistroBaker 7d0122
+	kaddr = ULONG(m.desc_ring + OFFSET(prb_desc_ring.infos));
DistroBaker 7d0122
+	m.infos = malloc(SIZE(printk_info) * m.desc_ring_count);
DistroBaker 7d0122
+	if (!m.infos) {
DistroBaker 7d0122
+		ERRMSG("Can't allocate memory for prb.desc_ring.infos.\n");
DistroBaker 7d0122
+		goto out_descs;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+	if (!readmem(VADDR, kaddr, m.infos, SIZE(printk_info) * m.desc_ring_count)) {
DistroBaker 7d0122
+		ERRMSG("Can't get prb.desc_ring.infos.\n");
DistroBaker 7d0122
+		goto out_infos;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* setup text data ring */
DistroBaker 7d0122
+	m.text_data_ring = m.prb + OFFSET(printk_ringbuffer.text_data_ring);
DistroBaker 7d0122
+	m.text_data_ring_size = 1 << UINT(m.text_data_ring + OFFSET(prb_data_ring.size_bits));
DistroBaker 7d0122
+
DistroBaker 7d0122
+	kaddr = ULONG(m.text_data_ring + OFFSET(prb_data_ring.data));
DistroBaker 7d0122
+	m.text_data = malloc(m.text_data_ring_size);
DistroBaker 7d0122
+	if (!m.text_data) {
DistroBaker 7d0122
+		ERRMSG("Can't allocate memory for prb.text_data_ring.data.\n");
DistroBaker 7d0122
+		goto out_infos;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+	if (!readmem(VADDR, kaddr, m.text_data, m.text_data_ring_size)) {
DistroBaker 7d0122
+		ERRMSG("Can't get prb.text_data_ring.\n");
DistroBaker 7d0122
+		goto out_text_data;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* ready to go */
DistroBaker 7d0122
+
DistroBaker 7d0122
+	tail_id = ULONG(m.desc_ring + OFFSET(prb_desc_ring.tail_id) +
DistroBaker 7d0122
+			OFFSET(atomic_long_t.counter));
DistroBaker 7d0122
+	head_id = ULONG(m.desc_ring + OFFSET(prb_desc_ring.head_id) +
DistroBaker 7d0122
+			OFFSET(atomic_long_t.counter));
DistroBaker 7d0122
+
DistroBaker 7d0122
+	if (!open_dump_file()) {
DistroBaker 7d0122
+		ERRMSG("Can't open output file.\n");
DistroBaker 7d0122
+		goto out_text_data;
DistroBaker 7d0122
+	}
DistroBaker 7d0122
+
DistroBaker 7d0122
+	for (id = tail_id; id != head_id; id = (id + 1) & DESC_ID_MASK)
DistroBaker 7d0122
+		dump_record(&m, id);
DistroBaker 7d0122
+
DistroBaker 7d0122
+	/* dump head record */
DistroBaker 7d0122
+	dump_record(&m, id);
DistroBaker 7d0122
+
DistroBaker 7d0122
+	if (!close_files_for_creating_dumpfile())
DistroBaker 7d0122
+		goto out_text_data;
DistroBaker 7d0122
+
DistroBaker 7d0122
+	ret = TRUE;
DistroBaker 7d0122
+out_text_data:
DistroBaker 7d0122
+	free(m.text_data);
DistroBaker 7d0122
+out_infos:
DistroBaker 7d0122
+	free(m.infos);
DistroBaker 7d0122
+out_descs:
DistroBaker 7d0122
+	free(m.descs);
DistroBaker 7d0122
+out_prb:
DistroBaker 7d0122
+	free(m.prb);
DistroBaker 7d0122
+	return ret;
DistroBaker 7d0122
+}
DistroBaker 7d0122
-- 
DistroBaker 7d0122
2.29.2
DistroBaker 7d0122