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Date: Wed, 6 Nov 2019 10:56:00 +0100
From: Miroslav Benes <mbenes@...e.cz>
To: heiko.carstens@...ibm.com, gor@...ux.ibm.com,
borntraeger@...ibm.com, jpoimboe@...hat.com,
joe.lawrence@...hat.com
Cc: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
jikos@...nel.org, pmladek@...e.com, nstange@...e.de,
live-patching@...r.kernel.org, Miroslav Benes <mbenes@...e.cz>
Subject: [PATCH v3 3/4] s390/unwind: prepare the unwinding interface for reliable stack traces
The reliable stack traces support will require to perform more actions
and some tasks differently. Add a new parameter to respective functions
and propagate it where appropriate.
Signed-off-by: Miroslav Benes <mbenes@...e.cz>
---
arch/s390/include/asm/stacktrace.h | 3 ++-
arch/s390/include/asm/unwind.h | 18 ++++++++++--------
arch/s390/kernel/dumpstack.c | 5 +++--
arch/s390/kernel/perf_event.c | 2 +-
arch/s390/kernel/stacktrace.c | 2 +-
arch/s390/kernel/unwind_bc.c | 19 +++++++++++--------
arch/s390/oprofile/init.c | 2 +-
7 files changed, 29 insertions(+), 22 deletions(-)
diff --git a/arch/s390/include/asm/stacktrace.h b/arch/s390/include/asm/stacktrace.h
index 0ae4bbf7779c..f033bb70a8db 100644
--- a/arch/s390/include/asm/stacktrace.h
+++ b/arch/s390/include/asm/stacktrace.h
@@ -21,7 +21,8 @@ struct stack_info {
const char *stack_type_name(enum stack_type type);
int get_stack_info(unsigned long sp, struct task_struct *task,
- struct stack_info *info, unsigned long *visit_mask);
+ struct stack_info *info, unsigned long *visit_mask,
+ bool unwind_reliable);
static inline bool on_stack(struct stack_info *info,
unsigned long addr, size_t len)
diff --git a/arch/s390/include/asm/unwind.h b/arch/s390/include/asm/unwind.h
index eaaefeceef6f..4c36e200404e 100644
--- a/arch/s390/include/asm/unwind.h
+++ b/arch/s390/include/asm/unwind.h
@@ -42,8 +42,9 @@ struct unwind_state {
};
void __unwind_start(struct unwind_state *state, struct task_struct *task,
- struct pt_regs *regs, unsigned long first_frame);
-bool unwind_next_frame(struct unwind_state *state);
+ struct pt_regs *regs, unsigned long first_frame,
+ bool unwind_reliable);
+bool unwind_next_frame(struct unwind_state *state, bool unwind_reliable);
unsigned long unwind_get_return_address(struct unwind_state *state);
static inline bool unwind_done(struct unwind_state *state)
@@ -59,10 +60,11 @@ static inline bool unwind_error(struct unwind_state *state)
static inline void unwind_start(struct unwind_state *state,
struct task_struct *task,
struct pt_regs *regs,
- unsigned long sp)
+ unsigned long sp,
+ bool unwind_reliable)
{
sp = sp ? : get_stack_pointer(task, regs);
- __unwind_start(state, task, regs, sp);
+ __unwind_start(state, task, regs, sp, unwind_reliable);
}
static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
@@ -70,10 +72,10 @@ static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
return unwind_done(state) ? NULL : state->regs;
}
-#define unwind_for_each_frame(state, task, regs, first_frame) \
- for (unwind_start(state, task, regs, first_frame); \
- !unwind_done(state); \
- unwind_next_frame(state))
+#define unwind_for_each_frame(state, task, regs, first_frame, unwind_reliable) \
+ for (unwind_start(state, task, regs, first_frame, unwind_reliable); \
+ !unwind_done(state); \
+ unwind_next_frame(state, unwind_reliable))
static inline void unwind_init(void) {}
static inline void unwind_module_init(struct module *mod, void *orc_ip,
diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
index 34bdc60c0b11..1ee19e6336cd 100644
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@@ -88,7 +88,8 @@ static bool in_restart_stack(unsigned long sp, struct stack_info *info)
}
int get_stack_info(unsigned long sp, struct task_struct *task,
- struct stack_info *info, unsigned long *visit_mask)
+ struct stack_info *info, unsigned long *visit_mask,
+ bool unwind_reliable)
{
if (!sp)
goto unknown;
@@ -130,7 +131,7 @@ void show_stack(struct task_struct *task, unsigned long *stack)
printk("Call Trace:\n");
if (!task)
task = current;
- unwind_for_each_frame(&state, task, NULL, (unsigned long) stack)
+ unwind_for_each_frame(&state, task, NULL, (unsigned long) stack, false)
printk(state.reliable ? " [<%016lx>] %pSR \n" :
"([<%016lx>] %pSR)\n",
state.ip, (void *) state.ip);
diff --git a/arch/s390/kernel/perf_event.c b/arch/s390/kernel/perf_event.c
index fcb6c2e92b07..7e81db0883e1 100644
--- a/arch/s390/kernel/perf_event.c
+++ b/arch/s390/kernel/perf_event.c
@@ -225,7 +225,7 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
{
struct unwind_state state;
- unwind_for_each_frame(&state, current, regs, 0)
+ unwind_for_each_frame(&state, current, regs, 0, false)
perf_callchain_store(entry, state.ip);
}
diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
index f8fc4f8aef9b..751c136172f7 100644
--- a/arch/s390/kernel/stacktrace.c
+++ b/arch/s390/kernel/stacktrace.c
@@ -16,7 +16,7 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
struct unwind_state state;
unsigned long addr;
- unwind_for_each_frame(&state, task, regs, 0) {
+ unwind_for_each_frame(&state, task, regs, 0, false) {
addr = unwind_get_return_address(&state);
if (!addr || !consume_entry(cookie, addr, false))
break;
diff --git a/arch/s390/kernel/unwind_bc.c b/arch/s390/kernel/unwind_bc.c
index 96da99ec7b59..092626f4e7c6 100644
--- a/arch/s390/kernel/unwind_bc.c
+++ b/arch/s390/kernel/unwind_bc.c
@@ -29,7 +29,7 @@ static bool update_stack_info(struct unwind_state *state, unsigned long sp)
unsigned long *mask = &state->stack_mask;
/* New stack pointer leaves the current stack */
- if (get_stack_info(sp, state->task, info, mask) != 0 ||
+ if (get_stack_info(sp, state->task, info, mask, false) != 0 ||
!on_stack(info, sp, sizeof(struct stack_frame)))
/* 'sp' does not point to a valid stack */
return false;
@@ -79,7 +79,8 @@ static bool unwind_use_regs(struct unwind_state *state)
return false;
}
-static bool unwind_use_frame(struct unwind_state *state, unsigned long sp)
+static bool unwind_use_frame(struct unwind_state *state, unsigned long sp,
+ bool unwind_reliable)
{
struct stack_frame *sf;
unsigned long ip;
@@ -100,7 +101,8 @@ static bool unwind_use_frame(struct unwind_state *state, unsigned long sp)
return false;
}
-static bool unwind_look_for_regs(struct unwind_state *state)
+static bool unwind_look_for_regs(struct unwind_state *state,
+ bool unwind_reliable)
{
struct stack_info *info = &state->stack_info;
struct pt_regs *regs;
@@ -123,7 +125,7 @@ static bool unwind_look_for_regs(struct unwind_state *state)
return false;
}
-bool unwind_next_frame(struct unwind_state *state)
+bool unwind_next_frame(struct unwind_state *state, bool unwind_reliable)
{
struct stack_frame *sf;
unsigned long sp;
@@ -136,15 +138,16 @@ bool unwind_next_frame(struct unwind_state *state)
/* Non-zero back-chain points to the previous frame */
if (likely(sp))
- return unwind_use_frame(state, sp);
+ return unwind_use_frame(state, sp, unwind_reliable);
/* No back-chain, look for a pt_regs structure */
- return unwind_look_for_regs(state);
+ return unwind_look_for_regs(state, unwind_reliable);
}
EXPORT_SYMBOL_GPL(unwind_next_frame);
void __unwind_start(struct unwind_state *state, struct task_struct *task,
- struct pt_regs *regs, unsigned long sp)
+ struct pt_regs *regs, unsigned long sp,
+ bool unwind_reliable)
{
struct stack_info *info = &state->stack_info;
unsigned long *mask = &state->stack_mask;
@@ -163,7 +166,7 @@ void __unwind_start(struct unwind_state *state, struct task_struct *task,
}
/* Get current stack pointer and initialize stack info */
- if (get_stack_info(sp, task, info, mask) != 0 ||
+ if (get_stack_info(sp, task, info, mask, unwind_reliable) != 0 ||
!on_stack(info, sp, sizeof(struct stack_frame))) {
/* Something is wrong with the stack pointer */
info->type = STACK_TYPE_UNKNOWN;
diff --git a/arch/s390/oprofile/init.c b/arch/s390/oprofile/init.c
index 7441857df51b..59d736f46cbc 100644
--- a/arch/s390/oprofile/init.c
+++ b/arch/s390/oprofile/init.c
@@ -19,7 +19,7 @@ static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
{
struct unwind_state state;
- unwind_for_each_frame(&state, current, regs, 0) {
+ unwind_for_each_frame(&state, current, regs, 0, false) {
if (depth-- == 0)
break;
oprofile_add_trace(state.ip);
--
2.23.0
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