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crash/SOURCES/0002-Fix-failure-of-dev-d-D...

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From 58c1816521c2e6bece3d69256b1866c9df8d93aa Mon Sep 17 00:00:00 2001
From: Kazuhito Hagio <k-hagio-ab@nec.com>
Date: Tue, 16 May 2023 08:59:50 +0900
Subject: [PATCH 2/6] Fix failure of "dev -d|-D" options on Linux 6.4 and later
kernels
Kernel commit 2df418cf4b72 ("driver core: class: remove subsystem
private pointer from struct class"), which is contained in Linux 6.4 and
later kernels, removed the class.p member for struct subsys_private. As
a result, the "dev -d|-D" options fail with the following error.
dev: invalid structure member offset: class_p
FILE: dev.c LINE: 4689 FUNCTION: init_iter()
Search the class_kset list for the subsys_private of block class to fix
this.
As a preparation, introduce get_subsys_private() function, which is
abstracted from the same search procedure in init_memory_block().
Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
---
defs.h | 1 +
dev.c | 20 +++++++++++++++++---
memory.c | 35 +++--------------------------------
tools.c | 43 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 64 insertions(+), 35 deletions(-)
diff --git a/defs.h b/defs.h
index 211fc9d55d33..21cc760444d1 100644
--- a/defs.h
+++ b/defs.h
@@ -5521,6 +5521,7 @@ struct rb_node *rb_left(struct rb_node *, struct rb_node *);
struct rb_node *rb_next(struct rb_node *);
struct rb_node *rb_last(struct rb_root *);
long percpu_counter_sum_positive(ulong fbc);
+ulong get_subsys_private(char *, char *);
/*
* symbols.c
diff --git a/dev.c b/dev.c
index 75d30bd022a1..9d38aef9b3db 100644
--- a/dev.c
+++ b/dev.c
@@ -4686,9 +4686,16 @@ init_iter(struct iter *i)
} else {
/* kernel version > 2.6.27, klist */
unsigned long class_private_addr;
- readmem(block_class_addr + OFFSET(class_p), KVADDR,
- &class_private_addr, sizeof(class_private_addr),
- "class.p", FAULT_ON_ERROR);
+
+ if (INVALID_MEMBER(class_p)) /* kernel version >= 6.4 */
+ class_private_addr = get_subsys_private("class_kset", "block");
+ else
+ readmem(block_class_addr + OFFSET(class_p), KVADDR,
+ &class_private_addr, sizeof(class_private_addr),
+ "class.p", FAULT_ON_ERROR);
+
+ if (!class_private_addr)
+ error(FATAL, "cannot determine subsys_private for block.\n");
if (VALID_STRUCT(class_private)) {
/* 2.6.27 < kernel version <= 2.6.37-rc2 */
@@ -4823,6 +4830,13 @@ void diskio_init(void)
if (INVALID_MEMBER(class_devices))
MEMBER_OFFSET_INIT(class_devices, "class", "devices");
MEMBER_OFFSET_INIT(class_p, "class", "p");
+ if (INVALID_MEMBER(class_p)) {
+ MEMBER_OFFSET_INIT(kset_list, "kset", "list");
+ MEMBER_OFFSET_INIT(kset_kobj, "kset", "kobj");
+ MEMBER_OFFSET_INIT(kobject_name, "kobject", "name");
+ MEMBER_OFFSET_INIT(kobject_entry, "kobject", "entry");
+ MEMBER_OFFSET_INIT(subsys_private_subsys, "subsys_private", "subsys");
+ }
MEMBER_OFFSET_INIT(class_private_devices, "class_private",
"class_devices");
MEMBER_OFFSET_INIT(device_knode_class, "device", "knode_class");
diff --git a/memory.c b/memory.c
index 0568f18eb9b7..953fc380c03c 100644
--- a/memory.c
+++ b/memory.c
@@ -17865,38 +17865,9 @@ init_memory_block(int *klistcnt, ulong **klistbuf)
* v6.3-rc1
* d2bf38c088e0 driver core: remove private pointer from struct bus_type
*/
- if (INVALID_MEMBER(bus_type_p)) {
- int i, cnt;
- char buf[32];
- ulong bus_kset, list, name;
-
- BZERO(ld, sizeof(struct list_data));
-
- get_symbol_data("bus_kset", sizeof(ulong), &bus_kset);
- readmem(bus_kset + OFFSET(kset_list), KVADDR, &list,
- sizeof(ulong), "bus_kset.list", FAULT_ON_ERROR);
-
- ld->flags |= LIST_ALLOCATE;
- ld->start = list;
- ld->end = bus_kset + OFFSET(kset_list);
- ld->list_head_offset = OFFSET(kobject_entry);
-
- cnt = do_list(ld);
- for (i = 0; i < cnt; i++) {
- readmem(ld->list_ptr[i] + OFFSET(kobject_name), KVADDR, &name,
- sizeof(ulong), "kobject.name", FAULT_ON_ERROR);
- read_string(name, buf, sizeof(buf)-1);
- if (CRASHDEBUG(1))
- fprintf(fp, "kobject: %lx name: %s\n", ld->list_ptr[i], buf);
- if (STREQ(buf, "memory")) {
- /* entry is subsys_private.subsys.kobj. See bus_to_subsys(). */
- private = ld->list_ptr[i] - OFFSET(kset_kobj)
- - OFFSET(subsys_private_subsys);
- break;
- }
- }
- FREEBUF(ld->list_ptr);
- } else {
+ if (INVALID_MEMBER(bus_type_p))
+ private = get_subsys_private("bus_kset", "memory");
+ else {
ulong memory_subsys = symbol_value("memory_subsys");
readmem(memory_subsys + OFFSET(bus_type_p), KVADDR, &private,
sizeof(void *), "memory_subsys.private", FAULT_ON_ERROR);
diff --git a/tools.c b/tools.c
index c2cfa7e280bc..392a79707e61 100644
--- a/tools.c
+++ b/tools.c
@@ -6963,3 +6963,46 @@ percpu_counter_sum_positive(ulong fbc)
return (ret < 0) ? 0 : ret;
}
+
+ulong
+get_subsys_private(char *kset_name, char *target_name)
+{
+ ulong kset_addr, kset_list, name_addr, private = 0;
+ struct list_data list_data, *ld;
+ char buf[32];
+ int i, cnt;
+
+ if (!symbol_exists(kset_name))
+ return 0;
+
+ ld = &list_data;
+ BZERO(ld, sizeof(struct list_data));
+
+ get_symbol_data(kset_name, sizeof(ulong), &kset_addr);
+ readmem(kset_addr + OFFSET(kset_list), KVADDR, &kset_list,
+ sizeof(ulong), "kset.list", FAULT_ON_ERROR);
+
+ ld->flags |= LIST_ALLOCATE;
+ ld->start = kset_list;
+ ld->end = kset_addr + OFFSET(kset_list);
+ ld->list_head_offset = OFFSET(kobject_entry);
+
+ cnt = do_list(ld);
+
+ for (i = 0; i < cnt; i++) {
+ readmem(ld->list_ptr[i] + OFFSET(kobject_name), KVADDR, &name_addr,
+ sizeof(ulong), "kobject.name", FAULT_ON_ERROR);
+ read_string(name_addr, buf, sizeof(buf)-1);
+ if (CRASHDEBUG(1))
+ fprintf(fp, "kobject: %lx name: %s\n", ld->list_ptr[i], buf);
+ if (STREQ(buf, target_name)) {
+ /* entry is subsys_private.subsys.kobj. See bus_to_subsys(). */
+ private = ld->list_ptr[i] - OFFSET(kset_kobj)
+ - OFFSET(subsys_private_subsys);
+ break;
+ }
+ }
+ FREEBUF(ld->list_ptr);
+
+ return private;
+}
--
2.37.1
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