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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/soc/rockchip/fiq_debugger/fiq_debugger.c
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@@ -50,6 +50,7 @@
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 #endif
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 #include <linux/uaccess.h>
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+#include <linux/cpuhotplug.h>
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 #include "fiq_debugger.h"
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 #include "fiq_debugger_priv.h"
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@@ -148,10 +149,7 @@
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 static bool initial_console_enable;
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 #endif
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-#ifdef CONFIG_FIQ_DEBUGGER_TRUST_ZONE
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-static struct fiq_debugger_state *state_tf;
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-#endif
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-
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+static struct fiq_debugger_state *g_state;
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 static bool fiq_kgdb_enable;
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 static bool fiq_debugger_disable;
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@@ -263,10 +261,11 @@
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 {
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 	char buf[512];
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 	size_t len;
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-	struct kmsg_dumper_iter dumper = { .active = true };
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+	struct kmsg_dumper dumper = { .active = true };
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-	kmsg_dump_rewind(&dumper);
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-	while (kmsg_dump_get_line(&dumper, true, buf,
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+
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+	kmsg_dump_rewind_nolock(&dumper);
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+	while (kmsg_dump_get_line_nolock(&dumper, true, buf,
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 					 sizeof(buf) - 1, &len)) {
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 		buf[len] = 0;
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 		fiq_debugger_puts(state, buf);
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@@ -1076,7 +1075,7 @@
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 #ifdef CONFIG_FIQ_DEBUGGER_TRUST_ZONE
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 void fiq_debugger_fiq(void *regs, u32 cpu)
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 {
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-	struct fiq_debugger_state *state = state_tf;
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+	struct fiq_debugger_state *state = g_state;
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 	bool need_irq;
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 	if (!state)
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@@ -1443,6 +1442,18 @@
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 	return 0;
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 }
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+static int fiq_debugger_cpu_offine_migrate_irq(unsigned int cpu)
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+{
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+	if (g_state && cpu == g_state->current_cpu) {
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+		unsigned int new_cpu = cpumask_any_but(cpu_online_mask, cpu);
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+
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+		if (new_cpu < nr_cpu_ids)
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+			g_state->current_cpu = new_cpu;
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+	}
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+
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+	return 0;
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+}
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+
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 static int fiq_debugger_probe(struct platform_device *pdev)
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 {
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 	int ret;
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@@ -1450,6 +1461,7 @@
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 	struct fiq_debugger_state *state;
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 	int fiq;
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 	int uart_irq;
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+	enum cpuhp_state cs = -1;
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1465
 
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 	if (pdev->id >= MAX_FIQ_DEBUGGER_PORTS)
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 		return -EINVAL;
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@@ -1555,7 +1567,7 @@
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 			pr_err("%s: could not install nmi irq handler\n", __func__);
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 			irq_clear_status_flags(state->uart_irq, IRQ_NOAUTOEN);
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 			ret = request_irq(state->uart_irq, fiq_debugger_uart_irq,
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-					  IRQF_NO_SUSPEND, "debug", state);
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+					  IRQF_NO_SUSPEND | IRQF_NOBALANCING, "debug", state);
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 		} else {
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 			enable_nmi(state->uart_irq);
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 		}
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@@ -1569,6 +1581,15 @@
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 		 * can.
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 		 */
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 		enable_irq_wake(state->uart_irq);
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+
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+		ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
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+						"soc/fiq_debugger",
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+						NULL,
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+						fiq_debugger_cpu_offine_migrate_irq);
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+		if (ret < 0)
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+			pr_err("%s: could not setup cpu offine handler\n", __func__);
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+		else
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+			cs = ret;
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 	}
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 	if (state->signal_irq >= 0) {
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@@ -1599,10 +1620,6 @@
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 	if (state->no_sleep)
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 		fiq_debugger_handle_wakeup(state);
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-#ifdef CONFIG_FIQ_DEBUGGER_TRUST_ZONE
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-	state_tf = state;
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-#endif
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-
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 	if (pdata->uart_init) {
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 		ret = pdata->uart_init(pdev);
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 		if (ret)
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@@ -1629,7 +1646,7 @@
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 	/* switch to cpu0 default */
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 	fiq_debugger_switch_cpu(state, 0);
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-
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+	g_state = state;
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 	return 0;
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 err_register_irq:
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@@ -1640,6 +1657,8 @@
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 		clk_disable(state->clk);
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 	if (state->clk)
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 		clk_put(state->clk);
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+	if (cs >= 0)
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+		cpuhp_remove_state_nocalls(cs);
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 	wakeup_source_remove(&state->debugger_wake_src);
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 	__pm_relax(&state->debugger_wake_src);
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 	platform_set_drvdata(pdev, NULL);