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ANDROID: arm64: add vendor hooks for kernel fault cases

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Add hooks to gather data of kernel fault and summarize it with
other information.

Bug: 177483057

Signed-off-by: Sangmoon Kim <sangmoon.kim@samsung.com>
Change-Id: I527eddf08be22fa842680bee850f1ef1f5a2c0ed
This commit is contained in:
Sangmoon Kim 2021-01-19 21:23:13 +09:00 committed by Todd Kjos
parent 18ebdc3746
commit a8313dbdb3
3 changed files with 48 additions and 0 deletions
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7
arch/arm64/mm/fault.c
View File

@ -41,6 +41,8 @@
#include <asm/tlbflush.h>
#include <asm/traps.h>
#include <trace/hooks/fault.h>
struct fault_info {
int (*fn)(unsigned long far, unsigned int esr,
struct pt_regs *regs);
@ -290,6 +292,7 @@ static void die_kernel_fault(const char *msg, unsigned long addr,
pr_alert("Unable to handle kernel %s at virtual address %016lx\n", msg,
addr);
trace_android_rvh_die_kernel_fault(regs, esr, addr, msg);
mem_abort_decode(esr);
show_pte(addr);
@ -724,6 +727,7 @@ static int do_sea(unsigned long far, unsigned int esr, struct pt_regs *regs)
*/
siaddr = untagged_addr(far);
}
trace_android_rvh_do_sea(regs, esr, siaddr, inf->name);
arm64_notify_die(inf->name, regs, inf->sig, inf->code, siaddr, esr);
return 0;
@ -819,6 +823,7 @@ void do_mem_abort(unsigned long far, unsigned int esr, struct pt_regs *regs)
if (!user_mode(regs)) {
pr_alert("Unhandled fault at 0x%016lx\n", addr);
trace_android_rvh_do_mem_abort(regs, esr, addr, inf->name);
mem_abort_decode(esr);
show_pte(addr);
}
@ -841,6 +846,8 @@ NOKPROBE_SYMBOL(do_el0_irq_bp_hardening);
void do_sp_pc_abort(unsigned long addr, unsigned int esr, struct pt_regs *regs)
{
trace_android_rvh_do_sp_pc_abort(regs, esr, addr, user_mode(regs));
arm64_notify_die("SP/PC alignment exception", regs, SIGBUS, BUS_ADRALN,
addr, esr);
}

5
drivers/android/vendor_hooks.c
View File

@ -34,6 +34,7 @@
#include <trace/hooks/timer.h>
#include <trace/hooks/softlockup.h>
#include <trace/hooks/power.h>
#include <trace/hooks/fault.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@ -145,3 +146,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_watchdog_timer_softlockup);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_try_to_freeze_todo);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_try_to_freeze_todo_unfrozen);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_dequeue_task_idle);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_die_kernel_fault);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_do_sea);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_do_mem_abort);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_do_sp_pc_abort);

36
include/trace/hooks/fault.h Normal file
View File

@ -0,0 +1,36 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM fault
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_FAULT_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_FAULT_H
#include <linux/tracepoint.h>
#include <trace/hooks/vendor_hooks.h>
/*
* Following tracepoints are not exported in tracefs and provide a
* mechanism for vendor modules to hook and extend functionality
*/
struct pt_regs;
DECLARE_RESTRICTED_HOOK(android_rvh_die_kernel_fault,
TP_PROTO(struct pt_regs *regs, unsigned int esr, unsigned long addr, const char *msg),
TP_ARGS(regs, esr, addr, msg), 1);
DECLARE_RESTRICTED_HOOK(android_rvh_do_sea,
TP_PROTO(struct pt_regs *regs, unsigned int esr, unsigned long addr, const char *msg),
TP_ARGS(regs, esr, addr, msg), 1);
DECLARE_RESTRICTED_HOOK(android_rvh_do_mem_abort,
TP_PROTO(struct pt_regs *regs, unsigned int esr, unsigned long addr, const char *msg),
TP_ARGS(regs, esr, addr, msg), 1);
DECLARE_RESTRICTED_HOOK(android_rvh_do_sp_pc_abort,
TP_PROTO(struct pt_regs *regs, unsigned int esr, unsigned long addr, bool user),
TP_ARGS(regs, esr, addr, user),
TP_CONDITION(!user));
/* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_FAULT_H */
/* This part must be outside protection */
#include <trace/define_trace.h>