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Message-ID: <CAAhV-H5BKzrKFrN6JzdDXPsqXA21P3RWE-SOp2oVdPuN4kjoGA@mail.gmail.com>
Date: Tue, 16 Jul 2024 17:24:25 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Tianyang Zhang <zhangtianyang@...ngson.cn>
Cc: corbet@....net, alexs@...nel.org, siyanteng@...ngson.cn, kernel@...0n.name,
tglx@...utronix.de, jiaxun.yang@...goat.com, gaoliang@...ngson.cn,
wangliupu@...ngson.cn, lvjianmin@...ngson.cn, yijun@...ngson.cn,
mhocko@...e.com, akpm@...ux-foundation.org, dianders@...omium.org,
maobibo@...ngson.cn, xry111@...111.site, zhaotianrui@...ngson.cn,
nathan@...nel.org, yangtiezhu@...ngson.cn, zhoubinbin@...ngson.cn,
loongarch@...ts.linux.dev, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5] LoongArch: Add AVEC irqchip support
Hi, Tianyang,
I'm fixing potential bugs, except NR_IRQS I found some other issues
which need your double check. Please see below carefully.
On Mon, Jul 15, 2024 at 11:34 AM Tianyang Zhang
<zhangtianyang@...ngson.cn> wrote:
>
> Introduce the advanced extended interrupt controllers. This feature will
> allow each core to have 256 independent interrupt vectors and MSI
> interrupts can be independently routed to any vector on any CPU.
>
> Co-developed-by: Jianmin Lv <lvjianmin@...ngson.cn>
> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
> Co-developed-by: Liupu Wang <wangliupu@...ngson.cn>
> Signed-off-by: Liupu Wang <wangliupu@...ngson.cn>
> Co-developed-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
> ---
> .../arch/loongarch/irq-chip-model.rst | 33 ++
> .../zh_CN/arch/loongarch/irq-chip-model.rst | 37 +-
> arch/loongarch/Kconfig | 1 +
> arch/loongarch/include/asm/cpu-features.h | 1 +
> arch/loongarch/include/asm/cpu.h | 2 +
> arch/loongarch/include/asm/hardirq.h | 3 +-
> arch/loongarch/include/asm/irq.h | 23 +-
> arch/loongarch/include/asm/loongarch.h | 18 +-
> arch/loongarch/include/asm/smp.h | 2 +
> arch/loongarch/kernel/cpu-probe.c | 3 +-
> arch/loongarch/kernel/paravirt.c | 5 +
> arch/loongarch/kernel/smp.c | 5 +
> drivers/irqchip/Makefile | 2 +-
> drivers/irqchip/irq-loongarch-avec.c | 433 ++++++++++++++++++
> drivers/irqchip/irq-loongarch-cpu.c | 4 +-
> drivers/irqchip/irq-loongson-eiointc.c | 3 +
> drivers/irqchip/irq-loongson-pch-msi.c | 42 +-
> 17 files changed, 603 insertions(+), 14 deletions(-)
> create mode 100644 drivers/irqchip/irq-loongarch-avec.c
>
> Changes log:
> V0->V1:
> 1.Modified some formats and declarations
> 2.Removed kmalloc/kfree when adding affinity related data to pending_list,
> and used moving tag to replace the original behavior
> 3.Adjusted the process that enables AVEC interrupts, now it is at the end of all processes
> 4.Removed CPUHP related callbacks, now irq_matrix_online/irq_matrix_offline is completed in start_secondary/loongson_cpu_disable
> 5.Adjusted compatibility issues for CONFIG_ACPI
> 6.About question:
> > irr = csr_read64(LOONGARCH_CSR_IRR0 + vector / 64);
> > should be good enough, no?
> csr_read64 was built-in as __csrrd_d, it doesn't seem to support variables as parameters
> >>>>
> drivers/irqchip/irq-loongarch-avec.c: In function ‘complete_irq_moving’:
> ./arch/loongarch/include/asm/loongarch.h:164:25: error: invalid argument to built-in function
> 164 | #define csr_read64(reg) __csrrd_d(reg)
> | ^~~~~~~~~
> drivers/irqchip/irq-loongarch-avec.c:170:23: note: in expansion of macro ‘csr_read64’
> 170 | irr = csr_read64(LOONGARCH_CSR_IRR_BASE + vector / VECTORS_PER_REG);
> | ^~~~~~~~~~
> >>>>
> So we have temporarily retained the previous implementation.
>
> V1->V2:
> Fixed up coding style. Made on/offline functions void
> Added compatibility when CONFIG_SMP is turned off
>
> V2->V3:
> Squash two patches into one
>
> V3->V4:
> Update NR_IRQS
> Update Register's name
> Fixed up coding style
> V4->V5:
> Retain feature CPUCFG1_MSGINT
> Fixed up coding style
> Delete the test code introduced by V4, and now msi msg address still uses the 32-bit address
>
> diff --git a/Documentation/arch/loongarch/irq-chip-model.rst b/Documentation/arch/loongarch/irq-chip-model.rst
> index 7988f4192363..a90c78c8e5bb 100644
> --- a/Documentation/arch/loongarch/irq-chip-model.rst
> +++ b/Documentation/arch/loongarch/irq-chip-model.rst
> @@ -85,6 +85,39 @@ to CPUINTC directly::
> | Devices |
> +---------+
>
> +Advanced Extended IRQ model
> +===========================
> +
> +In this model, IPI (Inter-Processor Interrupt) and CPU Local Timer interrupt go
> +to CPUINTC directly, CPU UARTS interrupts go to LIOINTC, PCH-MSI interrupts go to AVEC,
> +and then go to CPUINTC, Other devices interrupts go to PCH-PIC/PCH-LPC and gathered
> +by EIOINTC, and then go to CPUINTC directly::
> +
> + +-----+ +--------------------------+ +-------+
> + | IPI | --> | CPUINTC | <-- | Timer |
> + +-----+ +--------------------------+ +-------+
> + ^ ^ ^
> + | | |
> + +--------+ +---------+ +---------+ +-------+
> + | AVEC | | EIOINTC | | LIOINTC | <-- | UARTs |
> + +--------+ +---------+ +---------+ +-------+
> + ^ ^
> + | |
> + +---------+ +---------+
> + | PCH-MSI | | PCH-PIC |
> + +---------+ +---------+
> + ^ ^ ^
> + | | |
> + +---------+ +---------+ +---------+
> + | Devices | | PCH-LPC | | Devices |
> + +---------+ +---------+ +---------+
> + ^
> + |
> + +---------+
> + | Devices |
> + +---------+
> +
> +
> ACPI-related definitions
> ========================
>
> diff --git a/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst b/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst
> index f1e9ab18206c..b54567380c90 100644
> --- a/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst
> +++ b/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst
> @@ -9,9 +9,8 @@
> LoongArch的IRQ芯片模型（层级关系）
> ==================================
>
> -目前，基于LoongArch的处理器（如龙芯3A5000）只能与LS7A芯片组配合工作。LoongArch计算机
> -中的中断控制器（即IRQ芯片）包括CPUINTC（CPU Core Interrupt Controller）、LIOINTC（
> -Legacy I/O Interrupt Controller）、EIOINTC（Extended I/O Interrupt Controller）、
> +LoongArch计算机中的中断控制器（即IRQ芯片）包括CPUINTC（CPU Core Interrupt Controller）、
> +LIOINTC（Legacy I/O Interrupt Controller）、EIOINTC（Extended I/O Interrupt Controller）、
> HTVECINTC（Hyper-Transport Vector Interrupt Controller）、PCH-PIC（LS7A芯片组的主中
> 断控制器）、PCH-LPC（LS7A芯片组的LPC中断控制器）和PCH-MSI（MSI中断控制器）。
>
> @@ -87,6 +86,38 @@ PCH-LPC/PCH-MSI，然后被EIOINTC统一收集，再直接到达CPUINTC::
> | Devices |
> +---------+
>
> +高级扩展IRQ模型
> +=======================
> +
> +在这种模型里面，IPI（Inter-Processor Interrupt）和CPU本地时钟中断直接发送到CPUINTC，
> +CPU串口（UARTs）中断发送到LIOINTC，PCH-MSI中断发送到AVEC，而后通过AVEC送达CPUINTC，而
> +其他所有设备的中断则分别发送到所连接的PCH-PIC/PCH-LPC，然后由EIOINTC统一收集，再直
> +接到达CPUINTC::
> +
> + +-----+ +--------------------------+ +-------+
> + | IPI | --> | CPUINTC | <-- | Timer |
> + +-----+ +--------------------------+ +-------+
> + ^ ^ ^
> + | | |
> + +--------+ +---------+ +---------+ +-------+
> + | AVEC | | EIOINTC | | LIOINTC | <-- | UARTs |
> + +--------+ +---------+ +---------+ +-------+
> + ^ ^
> + | |
> + +---------+ +-------------+
> + | PCH-MSI | | PCH-PIC |
> + +---------+ +-------------+
> + ^ ^ ^
> + | | |
> + +---------+ +---------+ +---------+
> + | Devices | | PCH-LPC | | Devices |
> + +---------+ +---------+ +---------+
> + ^
> + |
> + +---------+
> + | Devices |
> + +---------+
> +
> ACPI相关的定义
> ==============
>
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index e38139c576ee..a66e49b5a68c 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -83,6 +83,7 @@ config LOONGARCH
> select GENERIC_ENTRY
> select GENERIC_GETTIMEOFDAY
> select GENERIC_IOREMAP if !ARCH_IOREMAP
> + select GENERIC_IRQ_MATRIX_ALLOCATOR
> select GENERIC_IRQ_MULTI_HANDLER
> select GENERIC_IRQ_PROBE
> select GENERIC_IRQ_SHOW
> diff --git a/arch/loongarch/include/asm/cpu-features.h b/arch/loongarch/include/asm/cpu-features.h
> index 2eafe6a6aca8..16a716f88a5c 100644
> --- a/arch/loongarch/include/asm/cpu-features.h
> +++ b/arch/loongarch/include/asm/cpu-features.h
> @@ -65,5 +65,6 @@
> #define cpu_has_guestid cpu_opt(LOONGARCH_CPU_GUESTID)
> #define cpu_has_hypervisor cpu_opt(LOONGARCH_CPU_HYPERVISOR)
> #define cpu_has_ptw cpu_opt(LOONGARCH_CPU_PTW)
> +#define cpu_has_avecint cpu_opt(LOONGARCH_CPU_AVECINT)
>
> #endif /* __ASM_CPU_FEATURES_H */
> diff --git a/arch/loongarch/include/asm/cpu.h b/arch/loongarch/include/asm/cpu.h
> index 48b9f7168bcc..843f9c4ec980 100644
> --- a/arch/loongarch/include/asm/cpu.h
> +++ b/arch/loongarch/include/asm/cpu.h
> @@ -99,6 +99,7 @@ enum cpu_type_enum {
> #define CPU_FEATURE_GUESTID 24 /* CPU has GuestID feature */
> #define CPU_FEATURE_HYPERVISOR 25 /* CPU has hypervisor (running in VM) */
> #define CPU_FEATURE_PTW 26 /* CPU has hardware page table walker */
> +#define CPU_FEATURE_AVECINT 27 /* CPU has avec interrupt */
>
> #define LOONGARCH_CPU_CPUCFG BIT_ULL(CPU_FEATURE_CPUCFG)
> #define LOONGARCH_CPU_LAM BIT_ULL(CPU_FEATURE_LAM)
> @@ -127,5 +128,6 @@ enum cpu_type_enum {
> #define LOONGARCH_CPU_GUESTID BIT_ULL(CPU_FEATURE_GUESTID)
> #define LOONGARCH_CPU_HYPERVISOR BIT_ULL(CPU_FEATURE_HYPERVISOR)
> #define LOONGARCH_CPU_PTW BIT_ULL(CPU_FEATURE_PTW)
> +#define LOONGARCH_CPU_AVECINT BIT_ULL(CPU_FEATURE_AVECINT)
>
> #endif /* _ASM_CPU_H */
> diff --git a/arch/loongarch/include/asm/hardirq.h b/arch/loongarch/include/asm/hardirq.h
> index d41138abcf26..b09891e4a4b2 100644
> --- a/arch/loongarch/include/asm/hardirq.h
> +++ b/arch/loongarch/include/asm/hardirq.h
> @@ -12,11 +12,12 @@
> extern void ack_bad_irq(unsigned int irq);
> #define ack_bad_irq ack_bad_irq
>
> -#define NR_IPI 2
> +#define NR_IPI 3
>
> enum ipi_msg_type {
> IPI_RESCHEDULE,
> IPI_CALL_FUNCTION,
> + IPI_CLEAR_VECT,
> };
>
> typedef struct {
> diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
> index 480418bc5071..899e6f9a9eaa 100644
> --- a/arch/loongarch/include/asm/irq.h
> +++ b/arch/loongarch/include/asm/irq.h
> @@ -39,11 +39,22 @@ void spurious_interrupt(void);
>
> #define NR_IRQS_LEGACY 16
>
> +/*
> + * 256 vectors Map:
> + *
> + * 0 - 15: mapping legacy IPs, e.g. IP0-12.
> + * 16 - 255: mapping a vector for external IRQ.
> + *
> + */
> +#define NR_VECTORS 256
> +#define IRQ_MATRIX_BITS NR_VECTORS
> +#define NR_LEGACY_VECTORS 16
> +
> #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
> void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu);
>
> #define MAX_IO_PICS 2
> -#define NR_IRQS (64 + (256 * MAX_IO_PICS))
> +#define NR_IRQS ((64 + (64 * MAX_IO_PICS)) + NR_VECTORS * NR_CPUS)
>
> struct acpi_vector_group {
> int node;
> @@ -65,7 +76,7 @@ extern struct acpi_vector_group msi_group[MAX_IO_PICS];
> #define LOONGSON_LPC_LAST_IRQ (LOONGSON_LPC_IRQ_BASE + 15)
>
> #define LOONGSON_CPU_IRQ_BASE 16
> -#define LOONGSON_CPU_LAST_IRQ (LOONGSON_CPU_IRQ_BASE + 14)
> +#define LOONGSON_CPU_LAST_IRQ (LOONGSON_CPU_IRQ_BASE + 15)
>
> #define LOONGSON_PCH_IRQ_BASE 64
> #define LOONGSON_PCH_ACPI_IRQ (LOONGSON_PCH_IRQ_BASE + 47)
> @@ -101,6 +112,14 @@ int pch_msi_acpi_init(struct irq_domain *parent,
> struct acpi_madt_msi_pic *acpi_pchmsi);
> int pch_pic_acpi_init(struct irq_domain *parent,
> struct acpi_madt_bio_pic *acpi_pchpic);
> +
> +int __init pch_msi_acpi_init_v2(struct irq_domain *parent,
> + struct acpi_madt_msi_pic *pch_msi_entry);
> +int __init loongarch_avec_acpi_init(struct irq_domain *parent);
> +void complete_irq_moving(void);
> +void loongarch_avec_offline_cpu(unsigned int cpu);
> +void loongarch_avec_online_cpu(unsigned int cpu);
Maybe it is better to use cpuhotplug callbacks, which is similar to
this method in irq-loongson-eiointc.c
cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_EIOINTC_STARTING,
"irqchip/loongarch/eiointc:starting",
eiointc_router_init, NULL);
> +
> int find_pch_pic(u32 gsi);
> struct fwnode_handle *get_pch_msi_handle(int pci_segment);
>
> diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h
> index eb09adda54b7..c21dc52338e3 100644
> --- a/arch/loongarch/include/asm/loongarch.h
> +++ b/arch/loongarch/include/asm/loongarch.h
> @@ -252,8 +252,8 @@
> #define CSR_ESTAT_EXC_WIDTH 6
> #define CSR_ESTAT_EXC (_ULCAST_(0x3f) << CSR_ESTAT_EXC_SHIFT)
> #define CSR_ESTAT_IS_SHIFT 0
> -#define CSR_ESTAT_IS_WIDTH 14
> -#define CSR_ESTAT_IS (_ULCAST_(0x3fff) << CSR_ESTAT_IS_SHIFT)
> +#define CSR_ESTAT_IS_WIDTH 15
> +#define CSR_ESTAT_IS (_ULCAST_(0x7fff) << CSR_ESTAT_IS_SHIFT)
>
> #define LOONGARCH_CSR_ERA 0x6 /* ERA */
>
> @@ -999,10 +999,17 @@
> #define CSR_FWPC_SKIP_SHIFT 16
> #define CSR_FWPC_SKIP (_ULCAST_(1) << CSR_FWPC_SKIP_SHIFT)
>
> +#define LOONGARCH_CSR_ISR0 0xa0
> +#define LOONGARCH_CSR_ISR1 0xa1
> +#define LOONGARCH_CSR_ISR2 0xa2
> +#define LOONGARCH_CSR_ISR3 0xa3
> +
> +#define LOONGARCH_CSR_IRR 0xa4
> +
> /*
> * CSR_ECFG IM
> */
> -#define ECFG0_IM 0x00001fff
> +#define ECFG0_IM 0x00005fff
> #define ECFGB_SIP0 0
> #define ECFGF_SIP0 (_ULCAST_(1) << ECFGB_SIP0)
> #define ECFGB_SIP1 1
> @@ -1045,6 +1052,7 @@
> #define IOCSRF_EIODECODE BIT_ULL(9)
> #define IOCSRF_FLATMODE BIT_ULL(10)
> #define IOCSRF_VM BIT_ULL(11)
> +#define IOCSRF_AVEC BIT_ULL(15)
>
> #define LOONGARCH_IOCSR_VENDOR 0x10
>
> @@ -1055,6 +1063,7 @@
> #define LOONGARCH_IOCSR_MISC_FUNC 0x420
> #define IOCSR_MISC_FUNC_TIMER_RESET BIT_ULL(21)
> #define IOCSR_MISC_FUNC_EXT_IOI_EN BIT_ULL(48)
> +#define IOCSR_MISC_FUNC_AVEC_EN BIT_ULL(51)
>
> #define LOONGARCH_IOCSR_CPUTEMP 0x428
>
> @@ -1375,9 +1384,10 @@ __BUILD_CSR_OP(tlbidx)
> #define INT_TI 11 /* Timer */
> #define INT_IPI 12
> #define INT_NMI 13
> +#define INT_AVEC 14
>
> /* ExcCodes corresponding to interrupts */
> -#define EXCCODE_INT_NUM (INT_NMI + 1)
> +#define EXCCODE_INT_NUM (INT_AVEC + 1)
> #define EXCCODE_INT_START 64
> #define EXCCODE_INT_END (EXCCODE_INT_START + EXCCODE_INT_NUM - 1)
>
> diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h
> index 278700cfee88..2399004596a3 100644
> --- a/arch/loongarch/include/asm/smp.h
> +++ b/arch/loongarch/include/asm/smp.h
> @@ -69,9 +69,11 @@ extern int __cpu_logical_map[NR_CPUS];
> #define ACTION_BOOT_CPU 0
> #define ACTION_RESCHEDULE 1
> #define ACTION_CALL_FUNCTION 2
> +#define ACTION_CLEAR_VECT 3
> #define SMP_BOOT_CPU BIT(ACTION_BOOT_CPU)
> #define SMP_RESCHEDULE BIT(ACTION_RESCHEDULE)
> #define SMP_CALL_FUNCTION BIT(ACTION_CALL_FUNCTION)
> +#define SMP_CLEAR_VECT BIT(ACTION_CLEAR_VECT)
>
> struct secondary_data {
> unsigned long stack;
> diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-probe.c
> index 55320813ee08..3b2e72e8f9bd 100644
> --- a/arch/loongarch/kernel/cpu-probe.c
> +++ b/arch/loongarch/kernel/cpu-probe.c
> @@ -106,7 +106,6 @@ static void cpu_probe_common(struct cpuinfo_loongarch *c)
> elf_hwcap |= HWCAP_LOONGARCH_CRC32;
> }
>
> -
> config = read_cpucfg(LOONGARCH_CPUCFG2);
> if (config & CPUCFG2_LAM) {
> c->options |= LOONGARCH_CPU_LAM;
> @@ -176,6 +175,8 @@ static void cpu_probe_common(struct cpuinfo_loongarch *c)
> c->options |= LOONGARCH_CPU_EIODECODE;
> if (config & IOCSRF_VM)
> c->options |= LOONGARCH_CPU_HYPERVISOR;
> + if (config & IOCSRF_AVEC)
> + c->options |= LOONGARCH_CPU_AVECINT;
>
> config = csr_read32(LOONGARCH_CSR_ASID);
> config = (config & CSR_ASID_BIT) >> CSR_ASID_BIT_SHIFT;
> diff --git a/arch/loongarch/kernel/paravirt.c b/arch/loongarch/kernel/paravirt.c
> index 1633ed4f692f..834c99cb4df4 100644
> --- a/arch/loongarch/kernel/paravirt.c
> +++ b/arch/loongarch/kernel/paravirt.c
> @@ -97,6 +97,11 @@ static irqreturn_t pv_ipi_interrupt(int irq, void *dev)
> info->ipi_irqs[IPI_CALL_FUNCTION]++;
> }
>
> + if (action & SMP_CLEAR_VECT) {
> + complete_irq_moving();
> + info->ipi_irqs[IPI_CLEAR_VECT]++;
> + }
> +
> return IRQ_HANDLED;
> }
>
> diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
> index 0dfe2388ef41..6dfedef306f3 100644
> --- a/arch/loongarch/kernel/smp.c
> +++ b/arch/loongarch/kernel/smp.c
> @@ -234,6 +234,9 @@ static irqreturn_t loongson_ipi_interrupt(int irq, void *dev)
> per_cpu(irq_stat, cpu).ipi_irqs[IPI_CALL_FUNCTION]++;
> }
>
> + if (action & SMP_CLEAR_VECT)
> + complete_irq_moving();
> +
> return IRQ_HANDLED;
> }
>
> @@ -388,6 +391,7 @@ int loongson_cpu_disable(void)
> irq_migrate_all_off_this_cpu();
> clear_csr_ecfg(ECFG0_IM);
> local_irq_restore(flags);
> + loongarch_avec_offline_cpu(cpu);
> local_flush_tlb_all();
>
> return 0;
> @@ -566,6 +570,7 @@ asmlinkage void start_secondary(void)
> * early is dangerous.
> */
> WARN_ON_ONCE(!irqs_disabled());
> + loongarch_avec_online_cpu(cpu);
> loongson_smp_finish();
>
> cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index 9f6f88274bec..1062e713cea4 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -109,7 +109,7 @@ 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_IRQ_LOONGARCH_CPU) += irq-loongarch-cpu.o irq-loongarch-avec.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-avec.c b/drivers/irqchip/irq-loongarch-avec.c
> new file mode 100644
> index 000000000000..744f46638def
> --- /dev/null
> +++ b/drivers/irqchip/irq-loongarch-avec.c
> @@ -0,0 +1,433 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020-2024 Loongson Technologies, Inc.
> + */
> +
> +#include <linux/cpuhotplug.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/kernel.h>
> +#include <linux/msi.h>
> +#include <linux/radix-tree.h>
> +#include <linux/spinlock.h>
> +
> +#include <asm/loongarch.h>
> +#include <asm/setup.h>
> +
> +#define VECTORS_PER_REG 64
> +#define IRR_INVALID_MASK 0x80000000UL
> +#define IRR_VECTOR_MASK 0xffUL
> +#define AVEC_MSG_OFFSET 0x100000
> +
> +static phys_addr_t msi_base_v2;
> +static DEFINE_PER_CPU(struct irq_desc * [NR_VECTORS], irq_map);
> +
> +#ifdef CONFIG_SMP
> +struct pending_list {
> + struct list_head head;
> +};
> +
> +static DEFINE_PER_CPU(struct pending_list, pending_list);
> +static struct cpumask intersect_mask;
> +#endif
> +
> +struct loongarch_avec_chip {
> + struct fwnode_handle *fwnode;
> + struct irq_domain *domain;
> + struct irq_matrix *vector_matrix;
> + raw_spinlock_t lock;
> +};
> +
> +static struct loongarch_avec_chip loongarch_avec;
> +
> +struct loongarch_avec_data {
> + struct list_head entry;
> + unsigned int cpu;
> + unsigned int vec;
> + unsigned int prev_cpu;
> + unsigned int prev_vec;
> + unsigned int moving : 1,
> + managed : 1;
> +};
> +
> +static inline void loongarch_avec_ack_irq(struct irq_data *d)
> +{
> +}
> +
> +static inline void loongarch_avec_unmask_irq(struct irq_data *d)
> +{
> +}
> +
> +static inline void loongarch_avec_mask_irq(struct irq_data *d)
> +{
> +}
> +
> +#ifdef CONFIG_SMP
> +static inline void pending_list_init(int cpu)
> +{
> + struct pending_list *plist = per_cpu_ptr(&pending_list, cpu);
> +
> + INIT_LIST_HEAD(&plist->head);
> +}
> +
> +static void loongarch_avec_sync(struct loongarch_avec_data *adata)
> +{
> + struct pending_list *plist;
> +
> + if (cpu_online(adata->prev_cpu)) {
> + plist = per_cpu_ptr(&pending_list, adata->prev_cpu);
> + list_add_tail(&adata->entry, &plist->head);
> + adata->moving = true;
> + mp_ops.send_ipi_single(adata->prev_cpu, ACTION_CLEAR_VECT);
> + }
> +}
> +
> +static int loongarch_avec_set_affinity(struct irq_data *data, const struct cpumask *dest,
> + bool force)
> +{
> + struct loongarch_avec_data *adata;
> + unsigned int cpu, vector;
> + unsigned long flags;
> + int ret;
> +
> + raw_spin_lock_irqsave(&loongarch_avec.lock, flags);
> + adata = irq_data_get_irq_chip_data(data);
> +
> + if (adata->vec && cpu_online(adata->cpu) && cpumask_test_cpu(adata->cpu, dest)) {
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> + return 0;
> + }
> + if (adata->moving)
> + return -EBUSY;
> +
> + cpumask_and(&intersect_mask, dest, cpu_online_mask);
> +
> + ret = irq_matrix_alloc(loongarch_avec.vector_matrix, &intersect_mask, false, &cpu);
> + if (ret < 0) {
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> + return ret;
> + }
> + vector = ret;
> + adata->cpu = cpu;
> + adata->vec = vector;
> + per_cpu_ptr(irq_map, adata->cpu)[adata->vec] = irq_data_to_desc(data);
> + loongarch_avec_sync(adata);
> +
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> + irq_data_update_effective_affinity(data, cpumask_of(cpu));
> +
> + return IRQ_SET_MASK_OK;
> +}
> +
> +void complete_irq_moving(void)
> +{
> + struct pending_list *plist = this_cpu_ptr(&pending_list);
> + struct loongarch_avec_data *adata, *tmp;
> + int cpu, vector, bias;
> + u64 isr;
> +
> + raw_spin_lock(&loongarch_avec.lock);
> +
> + list_for_each_entry_safe(adata, tmp, &plist->head, entry) {
> + cpu = adata->prev_cpu;
> + vector = adata->prev_vec;
> + bias = vector / VECTORS_PER_REG;
> + switch (bias) {
> + case 0:
> + isr = csr_read64(LOONGARCH_CSR_ISR0);
> + case 1:
> + isr = csr_read64(LOONGARCH_CSR_ISR1);
> + case 2:
> + isr = csr_read64(LOONGARCH_CSR_ISR2);
> + case 3:
> + isr = csr_read64(LOONGARCH_CSR_ISR3);
> + }
> +
> + if (isr & (1UL << (vector % VECTORS_PER_REG))) {
> + mp_ops.send_ipi_single(cpu, ACTION_CLEAR_VECT);
> + continue;
> + }
> + list_del(&adata->entry);
> + irq_matrix_free(loongarch_avec.vector_matrix, cpu, vector, adata->managed);
> + this_cpu_write(irq_map[vector], NULL);
> + adata->prev_cpu = adata->cpu;
> + adata->prev_vec = adata->vec;
> + adata->moving = 0;
> + }
> + raw_spin_unlock(&loongarch_avec.lock);
> +}
> +
> +void loongarch_avec_offline_cpu(unsigned int cpu)
> +{
> + struct pending_list *plist = per_cpu_ptr(&pending_list, cpu);
> + unsigned long flags;
> +
> + if (!loongarch_avec.vector_matrix)
> + return;
> +
> + raw_spin_lock_irqsave(&loongarch_avec.lock, flags);
> + if (list_empty(&plist->head))
> + irq_matrix_offline(loongarch_avec.vector_matrix);
> + else
> + pr_warn("cpu %d advanced extioi is busy\n", cpu);
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> +}
> +
> +void loongarch_avec_online_cpu(unsigned int cpu)
> +{
> + unsigned long flags;
> +
> + if (!loongarch_avec.vector_matrix)
> + return;
> +
> + raw_spin_lock_irqsave(&loongarch_avec.lock, flags);
> +
> + irq_matrix_online(loongarch_avec.vector_matrix);
> +
> + pending_list_init(cpu);
> +
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> +}
> +
> +#else
> +#define loongarch_avec_set_affinity NULL
> +#endif
> +
> +static void loongarch_avec_compose_msg(struct irq_data *d,
> + struct msi_msg *msg)
> +{
> + struct loongarch_avec_data *avec_data;
> +
> + avec_data = irq_data_get_irq_chip_data(d);
> +
> + msg->address_hi = 0x0;
> + msg->address_lo = (msi_base_v2 | (avec_data->vec & 0xff) << 4) |
> + ((cpu_logical_map(avec_data->cpu & 0xffff)) << 12);
> + msg->data = 0x0;
> +
> +}
> +
> +static struct irq_chip loongarch_avec_controller = {
> + .name = "AVECINTC",
> + .irq_ack = loongarch_avec_ack_irq,
> + .irq_mask = loongarch_avec_mask_irq,
> + .irq_unmask = loongarch_avec_unmask_irq,
> + .irq_set_affinity = loongarch_avec_set_affinity,
> + .irq_compose_msi_msg = loongarch_avec_compose_msg,
> +};
> +
> +static void loongarch_avec_dispatch(struct irq_desc *desc)
> +{
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + unsigned long vector;
> + struct irq_desc *d;
> +
> + chained_irq_enter(chip, desc);
> + vector = csr_read64(LOONGARCH_CSR_IRR);
> + if (vector & IRR_INVALID_MASK)
> + return;
Here missing a chained_irq_exit(chip, desc), right?
Moreover, I think it is better to handle all avecintc interrupts in
one dispatch, which means
chained_irq_enter(chip, desc);
while (true) {
vector = csr_read64(LOONGARCH_CSR_IRR);
if (vector & IRR_INVALID_MASK)
goto out;
vector &= IRR_VECTOR_MASK;
d = this_cpu_read(irq_map[vector]);
if (d)
generic_handle_irq_desc(d);
else {
spurious_interrupt();
pr_warn("Unexpected IRQ occurs on CPU#%d
[vector %ld]\n", smp_processor_id(), vector);
}
}
out:
chained_irq_exit(chip, desc);
Do you think so?
> +
> + vector &= IRR_VECTOR_MASK;
> +
> + d = this_cpu_read(irq_map[vector]);
> + if (d) {
> + generic_handle_irq_desc(d);
> + } else {
> + pr_warn("IRQ ERROR:Unexpected irq occur on cpu %d[vector %ld]\n",
> + smp_processor_id(), vector);
> + }
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> +static int loongarch_avec_alloc(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs, void *arg)
> +{
> + struct loongarch_avec_data *adata;
> + struct irq_data *irqd;
> + unsigned int cpu, vector, i, ret;
> + unsigned long flags;
> +
> + raw_spin_lock_irqsave(&loongarch_avec.lock, flags);
> + for (i = 0; i < nr_irqs; i++) {
> + irqd = irq_domain_get_irq_data(domain, virq + i);
> + adata = kzalloc(sizeof(*adata), GFP_KERNEL);
> + if (!adata) {
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> + return -ENOMEM;
> + }
> + ret = irq_matrix_alloc(loongarch_avec.vector_matrix, cpu_online_mask, false, &cpu);
> + if (ret < 0) {
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> + return ret;
> + }
> + vector = ret;
> + adata->prev_cpu = adata->cpu = cpu;
> + adata->prev_vec = adata->vec = vector;
> + adata->managed = irqd_affinity_is_managed(irqd);
> + irq_domain_set_info(domain, virq + i, virq + i, &loongarch_avec_controller,
> + adata, handle_edge_irq, NULL, NULL);
> + adata->moving = 0;
> + irqd_set_single_target(irqd);
> + irqd_set_affinity_on_activate(irqd);
> +
> + per_cpu_ptr(irq_map, adata->cpu)[adata->vec] = irq_data_to_desc(irqd);
> + }
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> +
> + return 0;
> +}
> +
> +static void clear_free_vector(struct irq_data *irqd)
> +{
> + struct loongarch_avec_data *adata = irq_data_get_irq_chip_data(irqd);
> + bool managed = irqd_affinity_is_managed(irqd);
> +
> + per_cpu(irq_map, adata->cpu)[adata->vec] = NULL;
> + irq_matrix_free(loongarch_avec.vector_matrix, adata->cpu, adata->vec, managed);
> + adata->cpu = 0;
> + adata->vec = 0;
> +#ifdef CONFIG_SMP
> + if (!adata->moving)
> + return;
> +
> + per_cpu(irq_map, adata->prev_cpu)[adata->prev_vec] = 0;
> + irq_matrix_free(loongarch_avec.vector_matrix, adata->prev_cpu,
> + adata->prev_vec, adata->managed);
> + adata->prev_vec = 0;
> + adata->prev_cpu = 0;
> + adata->moving = 0;
> + list_del_init(&adata->entry);
> +#endif
> +}
> +
> +static void loongarch_avec_free(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs)
> +{
> + struct irq_data *d;
> + unsigned long flags;
> + unsigned int i;
> +
> + raw_spin_lock_irqsave(&loongarch_avec.lock, flags);
> + for (i = 0; i < nr_irqs; i++) {
> + d = irq_domain_get_irq_data(domain, virq + i);
> + if (d) {
> + clear_free_vector(d);
> + irq_domain_reset_irq_data(d);
> +
> + }
> + }
> +
> + raw_spin_unlock_irqrestore(&loongarch_avec.lock, flags);
> +}
> +
> +static const struct irq_domain_ops loongarch_avec_domain_ops = {
> + .alloc = loongarch_avec_alloc,
> + .free = loongarch_avec_free,
> +};
> +
> +static int __init irq_matrix_init(void)
> +{
> + int i;
> +
> + loongarch_avec.vector_matrix = irq_alloc_matrix(NR_VECTORS, 0, NR_VECTORS - 1);
> + if (!loongarch_avec.vector_matrix)
> + return -ENOMEM;
> + for (i = 0; i < NR_LEGACY_VECTORS; i++)
> + irq_matrix_assign_system(loongarch_avec.vector_matrix, i, false);
> +
> + irq_matrix_online(loongarch_avec.vector_matrix);
> +
> + return 0;
> +}
> +
> +static int __init loongarch_avec_init(struct irq_domain *parent)
> +{
> + int ret = 0, parent_irq;
> + unsigned long tmp;
> +
> + raw_spin_lock_init(&loongarch_avec.lock);
> +
> + loongarch_avec.fwnode = irq_domain_alloc_named_fwnode("CORE_AVEC");
> + if (!loongarch_avec.fwnode) {
> + pr_err("Unable to allocate domain handle\n");
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + loongarch_avec.domain = irq_domain_create_tree(loongarch_avec.fwnode,
> + &loongarch_avec_domain_ops, NULL);
> + if (!loongarch_avec.domain) {
> + pr_err("core-vec: cannot create IRQ domain\n");
> + ret = -ENOMEM;
> + goto out_free_handle;
> + }
> +
> + parent_irq = irq_create_mapping(parent, INT_AVEC);
> + if (!parent_irq) {
> + pr_err("Failed to mapping hwirq\n");
> + ret = -EINVAL;
> + goto out_remove_domain;
> + }
> + irq_set_chained_handler_and_data(parent_irq, loongarch_avec_dispatch, NULL);
> +
> + ret = irq_matrix_init();
> + if (ret) {
> + pr_err("Failed to init irq matrix\n");
> + goto out_free_matrix;
> + }
> +#ifdef CONFIG_SMP
> + pending_list_init(0);
> +#endif
> + tmp = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC);
> + tmp |= IOCSR_MISC_FUNC_AVEC_EN;
> + iocsr_write64(tmp, LOONGARCH_IOCSR_MISC_FUNC);
> +
> + return ret;
> +
> +out_free_matrix:
> + kfree(loongarch_avec.vector_matrix);
> +out_remove_domain:
> + irq_domain_remove(loongarch_avec.domain);
> +out_free_handle:
> + irq_domain_free_fwnode(loongarch_avec.fwnode);
> +out:
> + return ret;
> +}
> +
> +static int __init pch_msi_parse_madt(union acpi_subtable_headers *header,
> + const unsigned long end)
> +{
> + struct acpi_madt_msi_pic *pchmsi_entry = (struct acpi_madt_msi_pic *)header;
> +
> + msi_base_v2 = pchmsi_entry->msg_address - AVEC_MSG_OFFSET;
> + return pch_msi_acpi_init_v2(loongarch_avec.domain, pchmsi_entry);
> +}
> +
> +static inline int __init acpi_cascade_irqdomain_init(void)
> +{
> + return acpi_table_parse_madt(ACPI_MADT_TYPE_MSI_PIC, pch_msi_parse_madt, 1);
> +}
> +
> +int __init loongarch_avec_acpi_init(struct irq_domain *parent)
> +{
> + int ret = 0;
> +
> + ret = loongarch_avec_init(parent);
> + if (ret) {
> + pr_err("Failed to init irq domain\n");
> + return ret;
> + }
> +
> + ret = acpi_cascade_irqdomain_init();
> + if (ret) {
> + pr_err("Failed to cascade IRQ domain\n");
> + return ret;
> + }
> +
> + return ret;
> +}
> diff --git a/drivers/irqchip/irq-loongarch-cpu.c b/drivers/irqchip/irq-loongarch-cpu.c
> index 9d8f2c406043..1ecac59925c6 100644
> --- a/drivers/irqchip/irq-loongarch-cpu.c
> +++ b/drivers/irqchip/irq-loongarch-cpu.c
> @@ -138,7 +138,9 @@ static int __init acpi_cascade_irqdomain_init(void)
> if (r < 0)
> return r;
>
> - return 0;
> + if (cpu_has_avecint)
> + r = loongarch_avec_acpi_init(irq_domain);
> + return r;
> }
>
> static int __init cpuintc_acpi_init(union acpi_subtable_headers *header,
> diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
> index c7ddebf312ad..1f9a30488137 100644
> --- a/drivers/irqchip/irq-loongson-eiointc.c
> +++ b/drivers/irqchip/irq-loongson-eiointc.c
> @@ -359,6 +359,9 @@ static int __init acpi_cascade_irqdomain_init(void)
> if (r < 0)
> return r;
>
> + if (cpu_has_avecint)
> + return 0;
> +
> r = acpi_table_parse_madt(ACPI_MADT_TYPE_MSI_PIC, pch_msi_parse_madt, 1);
> if (r < 0)
> return r;
> diff --git a/drivers/irqchip/irq-loongson-pch-msi.c b/drivers/irqchip/irq-loongson-pch-msi.c
> index dd4d699170f4..8b7aae22e782 100644
> --- a/drivers/irqchip/irq-loongson-pch-msi.c
> +++ b/drivers/irqchip/irq-loongson-pch-msi.c
> @@ -16,7 +16,6 @@
> #include <linux/slab.h>
>
> static int nr_pics;
> -
> struct pch_msi_data {
> struct mutex msi_map_lock;
> phys_addr_t doorbell;
> @@ -100,6 +99,17 @@ static struct irq_chip middle_irq_chip = {
> .irq_compose_msi_msg = pch_msi_compose_msi_msg,
> };
>
> +static struct irq_chip pch_msi_irq_chip_v2 = {
> + .name = "MSI",
> + .irq_ack = irq_chip_ack_parent,
I think these lines are also needed, right?
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_set_affinity = irq_chip_set_affinity_parent,
Huacai
> +};
> +
> +static struct msi_domain_info pch_msi_domain_info_v2 = {
> + .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
> + MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
> + .chip = &pch_msi_irq_chip_v2,
> +};
> +
> static int pch_msi_parent_domain_alloc(struct irq_domain *domain,
> unsigned int virq, int hwirq)
> {
> @@ -268,6 +278,9 @@ struct fwnode_handle *get_pch_msi_handle(int pci_segment)
> {
> int i;
>
> + if (cpu_has_avecint)
> + return pch_msi_handle[0];
> +
> for (i = 0; i < MAX_IO_PICS; i++) {
> if (msi_group[i].pci_segment == pci_segment)
> return pch_msi_handle[i];
> @@ -289,4 +302,31 @@ int __init pch_msi_acpi_init(struct irq_domain *parent,
>
> return ret;
> }
> +
> +int __init pch_msi_acpi_init_v2(struct irq_domain *parent, struct acpi_madt_msi_pic *msi_entry)
> +{
> + struct irq_domain *msi_domain;
> +
> + if (pch_msi_handle[0])
> + return 0;
> +
> + pch_msi_handle[0] = irq_domain_alloc_named_fwnode("msipic-v2");
> + if (!pch_msi_handle[0]) {
> + pr_err("Unable to allocate domain handle\n");
> + kfree(pch_msi_handle[0]);
> + return -ENOMEM;
> + }
> +
> + msi_domain = pci_msi_create_irq_domain(pch_msi_handle[0],
> + &pch_msi_domain_info_v2,
> + parent);
> + if (!msi_domain) {
> + pr_err("Failed to create PCI MSI domain\n");
> + kfree(pch_msi_handle[0]);
> + return -ENOMEM;
> + }
> +
> + pr_info("IRQ domain MSIPIC-V2 init done.\n");
> + return 0;
> +}
> #endif
> --
> 2.36.0
>
>
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