Re: [PATCH v3 1/6] LoongArch/smp: Refine ipi ops on LoongArch platform

From: Huacai Chen
Date: Mon Jan 29 2024 - 07:39:22 EST

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Hi, Bibo,

On Mon, Jan 22, 2024 at 6:03 PM Bibo Mao <maobibo@xxxxxxxxxxx> wrote:
>
> 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@xxxxxxxxxxx>
> ---
> 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);
To keep consistency, it is better to use call_func_ipi_single and
call_func_ipi_mask.

> + 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);
Similarly, to keep consistency, it is better to use
arch_send_function_ipi_single and arch_send_function_ipi_mask.

Huacai

> 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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