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Message-ID: <833d3c5c-7395-e195-16d3-929374d289e1@loongson.cn>
Date: Tue, 19 Jul 2022 21:43:15 +0800
From: Jianmin Lv <lvjianmin@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <maz@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, loongarch@...ts.linux.dev,
Hanjun Guo <guohanjun@...wei.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH V16 13/14] irqchip: Add LoongArch CPU interrupt controller
support
On 2022/7/18 下午11:21, Huacai Chen wrote:
> Hi, Jianmin,
>
> On Mon, Jul 18, 2022 at 10:21 PM Jianmin Lv <lvjianmin@...ngson.cn> wrote:
>>
>> From: Huacai Chen <chenhuacai@...ngson.cn>
>>
>> LoongArch CPUINTC stands for CSR.ECFG/CSR.ESTAT and related interrupt
>> controller that described in Section 7.4 of "LoongArch Reference Manual,
>> Vol 1". For more information please refer Documentation/loongarch/irq-
>> chip-model.rst.
>>
>> LoongArch CPUINTC has 13 interrupt sources: SWI0~1, HWI0~7, IPI, TI
>> (Timer) and PCOV (PMC). IRQ mappings of HWI0~7 are configurable (can be
>> created from DT/ACPI), but IPI, TI (Timer) and PCOV (PMC) are hardcoded
>> bits, so we expose the fwnode_handle to map them, and get mapped irq
>> by irq_create_mapping when using them.
>>
>> Co-developed-by: Jianmin Lv <lvjianmin@...ngson.cn>
>> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
>> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
>> ---
>> arch/loongarch/include/asm/irq.h | 7 +--
>> arch/loongarch/kernel/irq.c | 15 ++++-
>> arch/loongarch/kernel/time.c | 14 ++++-
>> drivers/irqchip/Kconfig | 10 ++++
>> drivers/irqchip/Makefile | 1 +
>> drivers/irqchip/irq-loongarch-cpu.c | 112 ++++++++++++++++++++++++++++++++++++
>> 6 files changed, 150 insertions(+), 9 deletions(-)
>> create mode 100644 drivers/irqchip/irq-loongarch-cpu.c
>>
>> diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
>> index 67ebcc5..149b212 100644
>> --- a/arch/loongarch/include/asm/irq.h
>> +++ b/arch/loongarch/include/asm/irq.h
>> @@ -35,9 +35,6 @@ static inline bool on_irq_stack(int cpu, unsigned long sp)
>> return (low <= sp && sp <= high);
>> }
>>
>> -int get_ipi_irq(void);
>> -int get_pmc_irq(void);
>> -int get_timer_irq(void);
>> void spurious_interrupt(void);
>>
>> #define NR_IRQS_LEGACY 16
>> @@ -94,8 +91,6 @@ struct acpi_vector_group {
>> struct acpi_madt_msi_pic;
>> struct acpi_madt_lpc_pic;
>>
>> -struct irq_domain *loongarch_cpu_irq_init(void);
>> -
>> int liointc_acpi_init(struct irq_domain *parent,
>> struct acpi_madt_lio_pic *acpi_liointc);
>> int eiointc_acpi_init(struct irq_domain *parent,
>> @@ -128,7 +123,7 @@ int pch_pic_acpi_init(struct irq_domain *parent,
>> extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS];
>> extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS];
>>
>> -extern struct irq_domain *cpu_domain;
>> +extern struct fwnode_handle *cpuintc_handle;
>> extern struct fwnode_handle *liointc_handle;
>> extern struct fwnode_handle *pch_lpc_handle;
>> extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
>> diff --git a/arch/loongarch/kernel/irq.c b/arch/loongarch/kernel/irq.c
>> index 06f2a15..99924d8 100644
>> --- a/arch/loongarch/kernel/irq.c
>> +++ b/arch/loongarch/kernel/irq.c
>> @@ -25,7 +25,6 @@
>> DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
>> EXPORT_PER_CPU_SYMBOL(irq_stat);
>>
>> -struct irq_domain *cpu_domain;
>> struct acpi_vector_group pch_group[MAX_IO_PICS];
>> struct acpi_vector_group msi_group[MAX_IO_PICS];
>>
>> @@ -89,6 +88,16 @@ 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, EXCCODE_IPI - EXCCODE_INT_START);
>> +
>> + return -EINVAL;
>> +}
>> +
>> void __init init_IRQ(void)
>> {
>> int i;
>> @@ -105,7 +114,9 @@ void __init init_IRQ(void)
>> init_vec_parent_group();
>> irqchip_init();
>> #ifdef CONFIG_SMP
>> - ipi_irq = EXCCODE_IPI - EXCCODE_INT_START;
>> + 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, loongson3_ipi_interrupt, "IPI", &ipi_dummy_dev);
>> if (r < 0)
>> diff --git a/arch/loongarch/kernel/time.c b/arch/loongarch/kernel/time.c
>> index fe68238..79dc5ed 100644
>> --- a/arch/loongarch/kernel/time.c
>> +++ b/arch/loongarch/kernel/time.c
>> @@ -123,6 +123,16 @@ void sync_counter(void)
>> csr_write64(-init_timeval, 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, EXCCODE_TIMER - EXCCODE_INT_START);
>> +
>> + return -EINVAL;
>> +}
>> +
>> int constant_clockevent_init(void)
>> {
>> unsigned int irq;
>> @@ -132,7 +142,9 @@ int constant_clockevent_init(void)
>> struct clock_event_device *cd;
>> static int timer_irq_installed = 0;
>>
>> - irq = EXCCODE_TIMER - EXCCODE_INT_START;
>> + irq = get_timer_irq();
>> + if (irq < 0)
>> + pr_err("Failed to map irq %d (timer)\n", irq);
>>
>> cd = &per_cpu(constant_clockevent_device, cpu);
>>
>> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
>> index 8f077d3..f53164c 100644
>> --- a/drivers/irqchip/Kconfig
>> +++ b/drivers/irqchip/Kconfig
>> @@ -546,6 +546,16 @@ config EXYNOS_IRQ_COMBINER
>> Say yes here to add support for the IRQ combiner devices embedded
>> in Samsung Exynos chips.
>>
>> +config IRQ_LOONGARCH_CPU
>> + bool
>> + select GENERIC_IRQ_CHIP
>> + select IRQ_DOMAIN
>> + select GENERIC_IRQ_EFFECTIVE_AFF_MASK
>> + help
>> + Support for the LoongArch CPU Interrupt Controller. For details of
>> + irq chip hierarchy on LoongArch platforms please read the document
>> + Documentation/loongarch/irq-chip-model.rst.
>> +
>> config LOONGSON_LIOINTC
>> bool "Loongson Local I/O Interrupt Controller"
>> depends on MACH_LOONGSON64
>> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
>> index 0cfd4f0..e559007 100644
>> --- a/drivers/irqchip/Makefile
>> +++ b/drivers/irqchip/Makefile
>> @@ -103,6 +103,7 @@ obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o
>> obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o
>> obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o
>> obj-$(CONFIG_TI_PRUSS_INTC) += irq-pruss-intc.o
>> +obj-$(CONFIG_IRQ_LOONGARCH_CPU) += irq-loongarch-cpu.o
>> obj-$(CONFIG_LOONGSON_LIOINTC) += irq-loongson-liointc.o
>> obj-$(CONFIG_LOONGSON_EIOINTC) += irq-loongson-eiointc.o
>> obj-$(CONFIG_LOONGSON_HTPIC) += irq-loongson-htpic.o
>> diff --git a/drivers/irqchip/irq-loongarch-cpu.c b/drivers/irqchip/irq-loongarch-cpu.c
>> new file mode 100644
>> index 0000000..b4db430
>> --- /dev/null
>> +++ b/drivers/irqchip/irq-loongarch-cpu.c
>> @@ -0,0 +1,112 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
>> + */
>> +
>> +#include <linux/init.h>
>> +#include <linux/kernel.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/irq.h>
>> +#include <linux/irqchip.h>
>> +#include <linux/irqdomain.h>
>> +
>> +#include <asm/loongarch.h>
>> +#include <asm/setup.h>
>> +
>> +static struct irq_domain *irq_domain;
>> +struct fwnode_handle *cpuintc_handle;
>> +
>> +static void mask_loongarch_irq(struct irq_data *d)
>> +{
>> + clear_csr_ecfg(ECFGF(d->hwirq));
>> +}
>> +
>> +static void unmask_loongarch_irq(struct irq_data *d)
>> +{
>> + set_csr_ecfg(ECFGF(d->hwirq));
>> +}
>> +
>> +static struct irq_chip cpu_irq_controller = {
>> + .name = "CPUINTC",
>> + .irq_mask = mask_loongarch_irq,
>> + .irq_unmask = unmask_loongarch_irq,
>> +};
>> +
>> +static void handle_cpu_irq(struct pt_regs *regs)
>> +{
>> + int hwirq;
>> + unsigned int estat = read_csr_estat() & CSR_ESTAT_IS;
>> +
>> + while ((hwirq = ffs(estat))) {
>> + estat &= ~BIT(hwirq - 1);
>> + generic_handle_domain_irq(irq_domain, hwirq - 1);
>> + }
>> +}
>> +
>> +static int loongarch_cpu_intc_map(struct irq_domain *d, unsigned int irq,
>> + irq_hw_number_t hwirq)
>> +{
>> + irq_set_noprobe(irq);
>> + irq_set_chip_and_handler(irq, &cpu_irq_controller, handle_percpu_irq);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct irq_domain_ops loongarch_cpu_intc_irq_domain_ops = {
>> + .map = loongarch_cpu_intc_map,
>> + .xlate = irq_domain_xlate_onecell,
>> +};
>> +
>> +static int __init
>> +liointc_parse_madt(union acpi_subtable_headers *header,
>> + const unsigned long end)
>> +{
>> + struct acpi_madt_lio_pic *liointc_entry = (struct acpi_madt_lio_pic *)header;
>> +
>> + return liointc_acpi_init(irq_domain, liointc_entry);
>> +}
>> +
>> +static int __init
>> +eiointc_parse_madt(union acpi_subtable_headers *header,
>> + const unsigned long end)
>> +{
>> + struct acpi_madt_eio_pic *eiointc_entry = (struct acpi_madt_eio_pic *)header;
>> +
>> + return eiointc_acpi_init(irq_domain, eiointc_entry);
>> +}
>> +
>> +static int __init acpi_cascade_irqdomain_init(void)
>> +{
>> + acpi_table_parse_madt(ACPI_MADT_TYPE_LIO_PIC,
>> + liointc_parse_madt, 0);
>> + acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC,
>> + eiointc_parse_madt, 0);
>> + return 0;
>> +}
>> +
>> +static int __init cpuintc_acpi_init_v1(union acpi_subtable_headers *header,
>> + const unsigned long end)
> Can we remove the _v1 postfix here? This can keep consistency across
> cpuintc/liointc/eiointc.
>
Ok, thanks.
> Huacai
>> +{
>> + if (irq_domain)
>> + return 0;
>> +
>> + /* Mask interrupts. */
>> + clear_csr_ecfg(ECFG0_IM);
>> + clear_csr_estat(ESTATF_IP);
>> +
>> + cpuintc_handle = irq_domain_alloc_fwnode(NULL);
>> + irq_domain = irq_domain_create_linear(cpuintc_handle, EXCCODE_INT_NUM,
>> + &loongarch_cpu_intc_irq_domain_ops, NULL);
>> +
>> + if (!irq_domain)
>> + panic("Failed to add irqdomain for LoongArch CPU");
>> +
>> + set_handle_irq(&handle_cpu_irq);
>> + acpi_cascade_irqdomain_init();
>> +
>> + return 0;
>> +}
>> +
>> +IRQCHIP_ACPI_DECLARE(cpuintc_v1, ACPI_MADT_TYPE_CORE_PIC,
>> + NULL, ACPI_MADT_CORE_PIC_VERSION_V1,
>> + cpuintc_acpi_init_v1);
>> --
>> 1.8.3.1
>>
>>
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