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mm: enable pagetrace for version U. [1/1]

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PD#SWPL-112188

Problem:
not find the unwind_frame() in arm64.

Solution:
replace the unwind_frame() with unwind_next() .

Verify:
t7c.

Change-Id: I1c62c29d68174333198965ff385ba3022170fa28
Signed-off-by: Jianxiong Pan <jianxiong.pan@amlogic.com>
This commit is contained in:
Jianxiong Pan
2023-03-16 06:17:36 +00:00
committed by gerrit autosubmit
parent 6d86bd4f4d
commit 9c2b1ee161
1 changed files with 86 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/memory_ext/page_trace.c
+86 -7
View File
@@ -426,7 +426,6 @@ static void __init find_static_common_symbol(void)
dump_common_caller();
}
#if CONFIG_AMLOGIC_KERNEL_VERSION < 14515
static int is_common_caller(struct alloc_caller *caller, unsigned long pc)
{
int ret = 0;
@@ -458,7 +457,6 @@ static int is_common_caller(struct alloc_caller *caller, unsigned long pc)
}
return ret;
}
#endif
unsigned long unpack_ip(struct page_trace *trace)
{
@@ -478,22 +476,100 @@ unsigned long unpack_ip(struct page_trace *trace)
return text + ((trace->ret_ip) << 2);
}
#if CONFIG_AMLOGIC_KERNEL_VERSION >= 14515 && defined(CONFIG_ARM64)
/*
* We can only safely access per-cpu stacks from current in a non-preemptible
* context.
*/
static bool on_accessible_stack(const struct task_struct *tsk,
unsigned long sp, unsigned long size,
struct stack_info *info)
{
if (info)
info->type = STACK_TYPE_UNKNOWN;
if (on_task_stack(tsk, sp, size, info))
return true;
if (tsk != current || preemptible())
return false;
if (on_irq_stack(sp, size, info))
return true;
if (on_overflow_stack(sp, size, info))
return true;
if (on_sdei_stack(sp, size, info))
return true;
return false;
}
/*
* Unwind from one frame record (A) to the next frame record (B).
*
* We terminate early if the location of B indicates a malformed chain of frame
* records (e.g. a cycle), determined based on the location and fp value of A
* and the location (but not the fp value) of B.
*/
static int notrace unwind_next(struct unwind_state *state)
{
struct task_struct *tsk = state->task;
unsigned long fp = state->fp;
struct stack_info info;
int err;
/* Final frame; nothing to unwind */
if (fp == (unsigned long)task_pt_regs(tsk)->stackframe)
return -ENOENT;
err = unwind_next_common(state, &info, on_accessible_stack, NULL);
if (err)
return err;
state->pc = ptrauth_strip_insn_pac(state->pc);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (tsk->ret_stack &&
(state->pc == (unsigned long)return_to_handler)) {
unsigned long orig_pc;
/*
* This is a case where function graph tracer has
* modified a return address (LR) in a stack frame
* to hook a function return.
* So replace it to an original value.
*/
orig_pc = ftrace_graph_ret_addr(tsk, NULL, state->pc,
(void *)state->fp);
if (WARN_ON_ONCE(state->pc == orig_pc))
return -EINVAL;
state->pc = orig_pc;
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
return 0;
}
#endif
unsigned long find_back_trace(void)
{
#if CONFIG_AMLOGIC_KERNEL_VERSION >= 14515
#if (CONFIG_AMLOGIC_KERNEL_VERSION >= 14515) && defined(CONFIG_ARM64)
struct unwind_state frame;
#else
struct stackframe frame;
#endif
int ret, step = 0;
#ifdef CONFIG_ARM64
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.pc = _RET_IP_;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = 0;
#endif
bitmap_zero(frame.stacks_done, __NR_STACK_TYPES);
frame.prev_fp = 0;
frame.prev_type = STACK_TYPE_UNKNOWN;
#if CONFIG_AMLOGIC_KERNEL_VERSION >= 14515
frame.task = current;
#else
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = 0;
#endif
#endif
#else
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_stack_pointer;
@@ -502,7 +578,11 @@ unsigned long find_back_trace(void)
#endif
while (1) {
#ifdef CONFIG_ARM64
#if CONFIG_AMLOGIC_KERNEL_VERSION >= 14515
ret = unwind_next(&frame);
#else
ret = unwind_frame(current, &frame);
#endif
#elif defined(CONFIG_ARM)
ret = unwind_frame(&frame);
#else /* not supported */
@@ -516,7 +596,6 @@ unsigned long find_back_trace(void)
}
pr_info("can't get pc\n");
dump_stack();
#endif
return 0;
}