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event: restore watch point after cpu pm event [1/1]

Browse Source 
PD#TV-9668

Problem:
After cpu idle enabled, watch point event register will be cleared
if cpu exit pm(idle). This will cause watch point can't work.

Solution:
re-enable watch point after cpu exit pm(idle)

Verify:
TL1

Change-Id: I4fc2002eaabecd4c5e60a5916bc29e0107882bec
Signed-off-by: Tao Zeng <tao.zeng@amlogic.com>
This commit is contained in:
Tao Zeng
2019-09-12 16:46:06 +08:00
committed by Luke Go
parent 802b47d3f8
commit 3cbc6e6115
2 changed files with 25 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/include/asm/hw_breakpoint.h
View File

@@ -52,6 +52,10 @@ static inline void decode_ctrl_reg(u32 reg,
#define ARM_DEBUG_ARCH_V7_MM 4
#define ARM_DEBUG_ARCH_V7_1 5
#define ARM_DEBUG_ARCH_V8 6
#ifdef CONFIG_AMLOGIC_MODIFY
/* for cortex-a55 */
#define ARM_DEBUG_ARCH_V8_1 8
#endif
/* Breakpoint */
#define ARM_BREAKPOINT_EXECUTE 0

21
arch/arm/kernel/hw_breakpoint.c
View File

@@ -261,6 +261,9 @@ static int enable_monitor_mode(void)
case ARM_DEBUG_ARCH_V7_ECP14:
case ARM_DEBUG_ARCH_V7_1:
case ARM_DEBUG_ARCH_V8:
#ifdef CONFIG_AMLOGIC_MODIFY
case ARM_DEBUG_ARCH_V8_1:
#endif
ARM_DBG_WRITE(c0, c2, 2, (dscr | ARM_DSCR_MDBGEN));
isb();
break;
@@ -1041,8 +1044,26 @@ static struct notifier_block dbg_reset_nb = {
static int dbg_cpu_pm_notify(struct notifier_block *self, unsigned long action,
void *v)
{
#ifdef CONFIG_AMLOGIC_MODIFY
struct perf_event *wp, **slots;
int i;
if (action == CPU_PM_EXIT) {
reset_ctrl_regs(NULL);
/* reinstall already installed wp after exit pm */
slots = this_cpu_ptr(wp_on_reg);
for (i = 0; i < core_num_wrps; ++i) {
wp = slots[i];
if (wp) {
slots[i] = NULL;
arch_install_hw_breakpoint(wp);
}
}
}
#else
if (action == CPU_PM_EXIT)
reset_ctrl_regs(NULL);
#endif
return NOTIFY_OK;
}