/*
* CPU initialisation.
*/
static void hw_breakpoint_reset(void *unused)
{
int i;
struct perf_event **slots;
/*
* When a CPU goes through cold-boot, it does not have any installed
* slot, so it is safe to share the same function for restoring and
* resetting breakpoints; when a CPU is hotplugged in, it goes
* through the slots, which are all empty, hence it just resets control
* and value for debug registers.
* When this function is triggered on warm-boot through a CPU PM
* notifier some slots might be initialized; if so they are
* reprogrammed according to the debug slots content.
*/
for (slots = this_cpu_ptr(bp_on_reg), i = 0; i < core_num_brps; ++i) {
if (slots[i]) {
hw_breakpoint_control(slots[i], HW_BREAKPOINT_RESTORE);
} else {
write_wb_reg(AARCH64_DBG_REG_BCR, i, 0UL);
write_wb_reg(AARCH64_DBG_REG_BVR, i, 0UL);
}
}
for (slots = this_cpu_ptr(wp_on_reg), i = 0; i < core_num_wrps; ++i) {
if (slots[i]) {
hw_breakpoint_control(slots[i], HW_BREAKPOINT_RESTORE);
} else {
write_wb_reg(AARCH64_DBG_REG_WCR, i, 0UL);
write_wb_reg(AARCH64_DBG_REG_WVR, i, 0UL);
}
}
}
static void hw_breakpoint_restore(void)
{
int i;
struct perf_event **slots;
for (slots = __get_cpu_var(bp_on_reg), i = 0; i < core_num_brps; ++i) {
if (slots[i]) {
hw_breakpoint_control(slots[i], HW_BREAKPOINT_RESTORE);
} else {
write_wb_reg(AARCH64_DBG_REG_BCR, i, 0UL);
write_wb_reg(AARCH64_DBG_REG_BVR, i, 0UL);
}
}
for (slots = __get_cpu_var(wp_on_reg), i = 0; i < core_num_wrps; ++i) {
if (slots[i]) {
hw_breakpoint_control(slots[i], HW_BREAKPOINT_RESTORE);
} else {
write_wb_reg(AARCH64_DBG_REG_WCR, i, 0UL);
write_wb_reg(AARCH64_DBG_REG_WVR, i, 0UL);
}
}
}
void arch_uninstall_hw_breakpoint(struct perf_event *bp)
{
hw_breakpoint_control(bp, HW_BREAKPOINT_UNINSTALL);
}
/*
* Install a perf counter breakpoint.
*/
int arch_install_hw_breakpoint(struct perf_event *bp)
{
return hw_breakpoint_control(bp, HW_BREAKPOINT_INSTALL);
}