Message-Id: <20240122100313.1589372-2-maobibo@loongson.cn>
Date: Mon, 22 Jan 2024 18:03:08 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Juergen Gross <jgross@...e.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux.dev,
	kvm@...r.kernel.org
Subject: [PATCH v3 1/6] LoongArch/smp: Refine ipi ops on LoongArch platform

This patch refines ipi handling on LoongArch platform, there are
three changes with this patch.
1. Add generic get_percpu_irq api, replace some percpu irq function
such as get_ipi_irq/get_pmc_irq/get_timer_irq with get_percpu_irq.

2. Change parameter action definition with function
loongson_send_ipi_single and loongson_send_ipi_mask. Code encoding is used
here rather than bitmap encoding for ipi action, ipi hw sender uses action
code, and ipi receiver will get action bitmap encoding, the ipi hw will
convert it into bitmap in ipi message buffer.

3. Add smp_ops on LoongArch platform so that pv ipi can be used later.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 arch/loongarch/include/asm/hardirq.h |  4 ++
 arch/loongarch/include/asm/irq.h     | 10 ++++-
 arch/loongarch/include/asm/smp.h     | 31 +++++++--------
 arch/loongarch/kernel/irq.c          | 22 +----------
 arch/loongarch/kernel/perf_event.c   | 14 +------
 arch/loongarch/kernel/smp.c          | 58 +++++++++++++++++++---------
 arch/loongarch/kernel/time.c         | 12 +-----
 7 files changed, 71 insertions(+), 80 deletions(-)

diff --git a/arch/loongarch/include/asm/hardirq.h b/arch/loongarch/include/asm/hardirq.h
index 0ef3b18f8980..9f0038e19c7f 100644
--- a/arch/loongarch/include/asm/hardirq.h
+++ b/arch/loongarch/include/asm/hardirq.h
@@ -12,6 +12,10 @@
 extern void ack_bad_irq(unsigned int irq);
 #define ack_bad_irq ack_bad_irq
 
+enum ipi_msg_type {
+	IPI_RESCHEDULE,
+	IPI_CALL_FUNCTION,
+};
 #define NR_IPI	2
 
 typedef struct {
diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
index 218b4da0ea90..00101b6d601e 100644
--- a/arch/loongarch/include/asm/irq.h
+++ b/arch/loongarch/include/asm/irq.h
@@ -117,8 +117,16 @@ extern struct fwnode_handle *liointc_handle;
 extern struct fwnode_handle *pch_lpc_handle;
 extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
 
-extern irqreturn_t loongson_ipi_interrupt(int irq, void *dev);
+static inline int get_percpu_irq(int vector)
+{
+	struct irq_domain *d;
+
+	d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY);
+	if (d)
+		return irq_create_mapping(d, vector);
 
+	return -EINVAL;
+}
 #include <asm-generic/irq.h>
 
 #endif /* _ASM_IRQ_H */
diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h
index f81e5f01d619..330f1cb3741c 100644
--- a/arch/loongarch/include/asm/smp.h
+++ b/arch/loongarch/include/asm/smp.h
@@ -12,6 +12,13 @@
 #include <linux/threads.h>
 #include <linux/cpumask.h>
 
+struct smp_ops {
+	void (*call_func_ipi)(const struct cpumask *mask, unsigned int action);
+	void (*call_func_single_ipi)(int cpu, unsigned int action);
+	void (*ipi_init)(void);
+};
+
+extern struct smp_ops smp_ops;
 extern int smp_num_siblings;
 extern int num_processors;
 extern int disabled_cpus;
@@ -24,8 +31,6 @@ void loongson_prepare_cpus(unsigned int max_cpus);
 void loongson_boot_secondary(int cpu, struct task_struct *idle);
 void loongson_init_secondary(void);
 void loongson_smp_finish(void);
-void loongson_send_ipi_single(int cpu, unsigned int action);
-void loongson_send_ipi_mask(const struct cpumask *mask, unsigned int action);
 #ifdef CONFIG_HOTPLUG_CPU
 int loongson_cpu_disable(void);
 void loongson_cpu_die(unsigned int cpu);
@@ -59,9 +64,12 @@ extern int __cpu_logical_map[NR_CPUS];
 
 #define cpu_physical_id(cpu)	cpu_logical_map(cpu)
 
-#define SMP_BOOT_CPU		0x1
-#define SMP_RESCHEDULE		0x2
-#define SMP_CALL_FUNCTION	0x4
+#define ACTTION_BOOT_CPU	0
+#define ACTTION_RESCHEDULE	1
+#define ACTTION_CALL_FUNCTION	2
+#define SMP_BOOT_CPU		BIT(ACTTION_BOOT_CPU)
+#define SMP_RESCHEDULE		BIT(ACTTION_RESCHEDULE)
+#define SMP_CALL_FUNCTION	BIT(ACTTION_CALL_FUNCTION)
 
 struct secondary_data {
 	unsigned long stack;
@@ -71,7 +79,8 @@ extern struct secondary_data cpuboot_data;
 
 extern asmlinkage void smpboot_entry(void);
 extern asmlinkage void start_secondary(void);
-
+extern void arch_send_call_function_single_ipi(int cpu);
+extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
 extern void calculate_cpu_foreign_map(void);
 
 /*
@@ -79,16 +88,6 @@ extern void calculate_cpu_foreign_map(void);
  */
 extern void show_ipi_list(struct seq_file *p, int prec);
 
-static inline void arch_send_call_function_single_ipi(int cpu)
-{
-	loongson_send_ipi_single(cpu, SMP_CALL_FUNCTION);
-}
-
-static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
-{
-	loongson_send_ipi_mask(mask, SMP_CALL_FUNCTION);
-}
-
 #ifdef CONFIG_HOTPLUG_CPU
 static inline int __cpu_disable(void)
 {
diff --git a/arch/loongarch/kernel/irq.c b/arch/loongarch/kernel/irq.c
index 883e5066ae44..1b58f7c3eed9 100644
--- a/arch/loongarch/kernel/irq.c
+++ b/arch/loongarch/kernel/irq.c
@@ -87,23 +87,9 @@ static void __init init_vec_parent_group(void)
 	acpi_table_parse(ACPI_SIG_MCFG, early_pci_mcfg_parse);
 }
 
-static int __init get_ipi_irq(void)
-{
-	struct irq_domain *d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY);
-
-	if (d)
-		return irq_create_mapping(d, INT_IPI);
-
-	return -EINVAL;
-}
-
 void __init init_IRQ(void)
 {
 	int i;
-#ifdef CONFIG_SMP
-	int r, ipi_irq;
-	static int ipi_dummy_dev;
-#endif
 	unsigned int order = get_order(IRQ_STACK_SIZE);
 	struct page *page;
 
@@ -113,13 +99,7 @@ void __init init_IRQ(void)
 	init_vec_parent_group();
 	irqchip_init();
 #ifdef CONFIG_SMP
-	ipi_irq = get_ipi_irq();
-	if (ipi_irq < 0)
-		panic("IPI IRQ mapping failed\n");
-	irq_set_percpu_devid(ipi_irq);
-	r = request_percpu_irq(ipi_irq, loongson_ipi_interrupt, "IPI", &ipi_dummy_dev);
-	if (r < 0)
-		panic("IPI IRQ request failed\n");
+	smp_ops.ipi_init();
 #endif
 
 	for (i = 0; i < NR_IRQS; i++)
diff --git a/arch/loongarch/kernel/perf_event.c b/arch/loongarch/kernel/perf_event.c
index 0491bf453cd4..3265c8f33223 100644
--- a/arch/loongarch/kernel/perf_event.c
+++ b/arch/loongarch/kernel/perf_event.c
@@ -456,16 +456,6 @@ static void loongarch_pmu_disable(struct pmu *pmu)
 static DEFINE_MUTEX(pmu_reserve_mutex);
 static atomic_t active_events = ATOMIC_INIT(0);
 
-static int get_pmc_irq(void)
-{
-	struct irq_domain *d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY);
-
-	if (d)
-		return irq_create_mapping(d, INT_PCOV);
-
-	return -EINVAL;
-}
-
 static void reset_counters(void *arg);
 static int __hw_perf_event_init(struct perf_event *event);
 
@@ -473,7 +463,7 @@ static void hw_perf_event_destroy(struct perf_event *event)
 {
 	if (atomic_dec_and_mutex_lock(&active_events, &pmu_reserve_mutex)) {
 		on_each_cpu(reset_counters, NULL, 1);
-		free_irq(get_pmc_irq(), &loongarch_pmu);
+		free_irq(get_percpu_irq(INT_PCOV), &loongarch_pmu);
 		mutex_unlock(&pmu_reserve_mutex);
 	}
 }
@@ -562,7 +552,7 @@ static int loongarch_pmu_event_init(struct perf_event *event)
 	if (event->cpu >= 0 && !cpu_online(event->cpu))
 		return -ENODEV;
 
-	irq = get_pmc_irq();
+	irq = get_percpu_irq(INT_PCOV);
 	flags = IRQF_PERCPU | IRQF_NOBALANCING | IRQF_NO_THREAD | IRQF_NO_SUSPEND | IRQF_SHARED;
 	if (!atomic_inc_not_zero(&active_events)) {
 		mutex_lock(&pmu_reserve_mutex);
diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
index a16e3dbe9f09..46735ba49815 100644
--- a/arch/loongarch/kernel/smp.c
+++ b/arch/loongarch/kernel/smp.c
@@ -66,11 +66,6 @@ static cpumask_t cpu_core_setup_map;
 struct secondary_data cpuboot_data;
 static DEFINE_PER_CPU(int, cpu_state);
 
-enum ipi_msg_type {
-	IPI_RESCHEDULE,
-	IPI_CALL_FUNCTION,
-};
-
 static const char *ipi_types[NR_IPI] __tracepoint_string = {
 	[IPI_RESCHEDULE] = "Rescheduling interrupts",
 	[IPI_CALL_FUNCTION] = "Function call interrupts",
@@ -123,24 +118,19 @@ static u32 ipi_read_clear(int cpu)
 
 static void ipi_write_action(int cpu, u32 action)
 {
-	unsigned int irq = 0;
-
-	while ((irq = ffs(action))) {
-		uint32_t val = IOCSR_IPI_SEND_BLOCKING;
+	uint32_t val;
 
-		val |= (irq - 1);
-		val |= (cpu << IOCSR_IPI_SEND_CPU_SHIFT);
-		iocsr_write32(val, LOONGARCH_IOCSR_IPI_SEND);
-		action &= ~BIT(irq - 1);
-	}
+	val = IOCSR_IPI_SEND_BLOCKING | action;
+	val |= (cpu << IOCSR_IPI_SEND_CPU_SHIFT);
+	iocsr_write32(val, LOONGARCH_IOCSR_IPI_SEND);
 }
 
-void loongson_send_ipi_single(int cpu, unsigned int action)
+static void loongson_send_ipi_single(int cpu, unsigned int action)
 {
 	ipi_write_action(cpu_logical_map(cpu), (u32)action);
 }
 
-void loongson_send_ipi_mask(const struct cpumask *mask, unsigned int action)
+static void loongson_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 {
 	unsigned int i;
 
@@ -148,6 +138,16 @@ void loongson_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 		ipi_write_action(cpu_logical_map(i), (u32)action);
 }
 
+void arch_send_call_function_single_ipi(int cpu)
+{
+	smp_ops.call_func_single_ipi(cpu, ACTTION_CALL_FUNCTION);
+}
+
+void arch_send_call_function_ipi_mask(const struct cpumask *mask)
+{
+	smp_ops.call_func_ipi(mask, ACTTION_CALL_FUNCTION);
+}
+
 /*
  * This function sends a 'reschedule' IPI to another CPU.
  * it goes straight through and wastes no time serializing
@@ -155,11 +155,11 @@ void loongson_send_ipi_mask(const struct cpumask *mask, unsigned int action)
  */
 void arch_smp_send_reschedule(int cpu)
 {
-	loongson_send_ipi_single(cpu, SMP_RESCHEDULE);
+	smp_ops.call_func_single_ipi(cpu, ACTTION_RESCHEDULE);
 }
 EXPORT_SYMBOL_GPL(arch_smp_send_reschedule);
 
-irqreturn_t loongson_ipi_interrupt(int irq, void *dev)
+static irqreturn_t loongson_ipi_interrupt(int irq, void *dev)
 {
 	unsigned int action;
 	unsigned int cpu = smp_processor_id();
@@ -179,6 +179,26 @@ irqreturn_t loongson_ipi_interrupt(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
+static void loongson_ipi_init(void)
+{
+	int r, ipi_irq;
+
+	ipi_irq = get_percpu_irq(INT_IPI);
+	if (ipi_irq < 0)
+		panic("IPI IRQ mapping failed\n");
+
+	irq_set_percpu_devid(ipi_irq);
+	r = request_percpu_irq(ipi_irq, loongson_ipi_interrupt, "IPI", &irq_stat);
+	if (r < 0)
+		panic("IPI IRQ request failed\n");
+}
+
+struct smp_ops smp_ops = {
+	.call_func_single_ipi	= loongson_send_ipi_single,
+	.call_func_ipi		= loongson_send_ipi_mask,
+	.ipi_init		= loongson_ipi_init,
+};
+
 static void __init fdt_smp_setup(void)
 {
 #ifdef CONFIG_OF
@@ -256,7 +276,7 @@ void loongson_boot_secondary(int cpu, struct task_struct *idle)
 
 	csr_mail_send(entry, cpu_logical_map(cpu), 0);
 
-	loongson_send_ipi_single(cpu, SMP_BOOT_CPU);
+	loongson_send_ipi_single(cpu, ACTTION_BOOT_CPU);
 }
 
 /*
diff --git a/arch/loongarch/kernel/time.c b/arch/loongarch/kernel/time.c
index e7015f7b70e3..fd5354f9be7c 100644
--- a/arch/loongarch/kernel/time.c
+++ b/arch/loongarch/kernel/time.c
@@ -123,16 +123,6 @@ void sync_counter(void)
 	csr_write64(init_offset, LOONGARCH_CSR_CNTC);
 }
 
-static int get_timer_irq(void)
-{
-	struct irq_domain *d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY);
-
-	if (d)
-		return irq_create_mapping(d, INT_TI);
-
-	return -EINVAL;
-}
-
 int constant_clockevent_init(void)
 {
 	unsigned int cpu = smp_processor_id();
@@ -142,7 +132,7 @@ int constant_clockevent_init(void)
 	static int irq = 0, timer_irq_installed = 0;
 
 	if (!timer_irq_installed) {
-		irq = get_timer_irq();
+		irq = get_percpu_irq(INT_TI);
 		if (irq < 0)
 			pr_err("Failed to map irq %d (timer)\n", irq);
 	}
-- 
2.39.3

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