Пример #1
0
/*
 * 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);
}