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irqchip/loongarch-avec: Add AVEC irqchip support
Introduce the advanced extended interrupt controllers (AVECINTC). 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.
The whole topology of irqchips in LoongArch machines looks like this if
AVECINTC is supported:
+-----+ +-----------------------+ +-------+
| IPI | --> | CPUINTC | <-- | Timer |
+-----+ +-----------------------+ +-------+
^ ^ ^
| | |
+---------+ +----------+ +---------+ +-------+
| EIOINTC | | AVECINTC | | LIOINTC | <-- | UARTs |
+---------+ +----------+ +---------+ +-------+
^ ^
| |
+---------+ +---------+
| PCH-PIC | | PCH-MSI |
+---------+ +---------+
^ ^ ^
| | |
+---------+ +---------+ +---------+
| Devices | | PCH-LPC | | Devices |
+---------+ +---------+ +---------+
^
|
+---------+
| Devices |
+---------+
Co-developed-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Co-developed-by: Liupu Wang <wangliupu@loongson.cn>
Signed-off-by: Liupu Wang <wangliupu@loongson.cn>
Co-developed-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Tianyang Zhang <zhangtianyang@loongson.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20240823104337.25577-2-zhangtianyang@loongson.cn
This commit is contained in:
Tianyang Zhang
Thomas Gleixner
parent
a1d4646d34
commit
ae16f05c92
@ -85,6 +85,7 @@ config LOONGARCH
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select GENERIC_ENTRY
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select GENERIC_GETTIMEOFDAY
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select GENERIC_IOREMAP if !ARCH_IOREMAP
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select GENERIC_IRQ_MATRIX_ALLOCATOR
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select GENERIC_IRQ_MULTI_HANDLER
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select GENERIC_IRQ_PROBE
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select GENERIC_IRQ_SHOW
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@ -99,6 +99,8 @@ struct acpi_madt_bio_pic;
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struct acpi_madt_msi_pic;
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struct acpi_madt_lpc_pic;
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void complete_irq_moving(void);
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struct fwnode_handle *get_pch_msi_handle(int pci_segment);
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extern struct acpi_madt_lio_pic *acpi_liointc;
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@ -134,6 +134,11 @@ static irqreturn_t pv_ipi_interrupt(int irq, void *dev)
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info->ipi_irqs[IPI_IRQ_WORK]++;
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}
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if (action & SMP_CLEAR_VECTOR) {
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complete_irq_moving();
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info->ipi_irqs[IPI_CLEAR_VECTOR]++;
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}
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return IRQ_HANDLED;
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}
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@ -72,6 +72,7 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = {
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[IPI_RESCHEDULE] = "Rescheduling interrupts",
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[IPI_CALL_FUNCTION] = "Function call interrupts",
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[IPI_IRQ_WORK] = "IRQ work interrupts",
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[IPI_CLEAR_VECTOR] = "Clear vector interrupts",
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};
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void show_ipi_list(struct seq_file *p, int prec)
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@ -248,6 +249,11 @@ static irqreturn_t loongson_ipi_interrupt(int irq, void *dev)
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per_cpu(irq_stat, cpu).ipi_irqs[IPI_IRQ_WORK]++;
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}
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if (action & SMP_CLEAR_VECTOR) {
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complete_irq_moving();
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per_cpu(irq_stat, cpu).ipi_irqs[IPI_CLEAR_VECTOR]++;
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}
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return IRQ_HANDLED;
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}
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@ -110,7 +110,7 @@ obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o
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obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o
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obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o
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obj-$(CONFIG_TI_PRUSS_INTC) += irq-pruss-intc.o
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obj-$(CONFIG_IRQ_LOONGARCH_CPU) += irq-loongarch-cpu.o
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obj-$(CONFIG_IRQ_LOONGARCH_CPU) += irq-loongarch-cpu.o irq-loongarch-avec.o
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obj-$(CONFIG_LOONGSON_LIOINTC) += irq-loongson-liointc.o
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obj-$(CONFIG_LOONGSON_EIOINTC) += irq-loongson-eiointc.o
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obj-$(CONFIG_LOONGSON_HTPIC) += irq-loongson-htpic.o
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425
drivers/irqchip/irq-loongarch-avec.c
Normal file
425
drivers/irqchip/irq-loongarch-avec.c
Normal file
@ -0,0 +1,425 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2024 Loongson Technologies, Inc.
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*/
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#include <linux/cpuhotplug.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqchip.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/irqdomain.h>
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#include <linux/kernel.h>
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#include <linux/msi.h>
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#include <linux/radix-tree.h>
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#include <linux/spinlock.h>
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#include <asm/loongarch.h>
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#include <asm/setup.h>
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#include "irq-msi-lib.h"
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#include "irq-loongson.h"
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#define VECTORS_PER_REG 64
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#define IRR_VECTOR_MASK 0xffUL
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#define IRR_INVALID_MASK 0x80000000UL
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#define AVEC_MSG_OFFSET 0x100000
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#ifdef CONFIG_SMP
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struct pending_list {
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struct list_head head;
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};
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static struct cpumask intersect_mask;
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static DEFINE_PER_CPU(struct pending_list, pending_list);
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#endif
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static DEFINE_PER_CPU(struct irq_desc * [NR_VECTORS], irq_map);
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struct avecintc_chip {
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raw_spinlock_t lock;
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struct fwnode_handle *fwnode;
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struct irq_domain *domain;
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struct irq_matrix *vector_matrix;
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phys_addr_t msi_base_addr;
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};
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static struct avecintc_chip loongarch_avec;
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struct avecintc_data {
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struct list_head entry;
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unsigned int cpu;
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unsigned int vec;
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unsigned int prev_cpu;
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unsigned int prev_vec;
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unsigned int moving;
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};
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static inline void avecintc_ack_irq(struct irq_data *d)
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{
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}
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static inline void avecintc_mask_irq(struct irq_data *d)
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{
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}
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static inline void avecintc_unmask_irq(struct irq_data *d)
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{
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}
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#ifdef CONFIG_SMP
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static inline void pending_list_init(int cpu)
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{
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struct pending_list *plist = per_cpu_ptr(&pending_list, cpu);
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INIT_LIST_HEAD(&plist->head);
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}
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static void avecintc_sync(struct avecintc_data *adata)
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{
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struct pending_list *plist;
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if (cpu_online(adata->prev_cpu)) {
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plist = per_cpu_ptr(&pending_list, adata->prev_cpu);
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list_add_tail(&adata->entry, &plist->head);
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adata->moving = 1;
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mp_ops.send_ipi_single(adata->prev_cpu, ACTION_CLEAR_VECTOR);
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}
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}
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static int avecintc_set_affinity(struct irq_data *data, const struct cpumask *dest, bool force)
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{
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int cpu, ret, vector;
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struct avecintc_data *adata;
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scoped_guard(raw_spinlock, &loongarch_avec.lock) {
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adata = irq_data_get_irq_chip_data(data);
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if (adata->moving)
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return -EBUSY;
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if (cpu_online(adata->cpu) && cpumask_test_cpu(adata->cpu, dest))
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return 0;
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cpumask_and(&intersect_mask, dest, cpu_online_mask);
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ret = irq_matrix_alloc(loongarch_avec.vector_matrix, &intersect_mask, false, &cpu);
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if (ret < 0)
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return ret;
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vector = ret;
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adata->cpu = cpu;
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adata->vec = vector;
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per_cpu_ptr(irq_map, adata->cpu)[adata->vec] = irq_data_to_desc(data);
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avecintc_sync(adata);
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}
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irq_data_update_effective_affinity(data, cpumask_of(cpu));
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return IRQ_SET_MASK_OK;
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}
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static int avecintc_cpu_online(unsigned int cpu)
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{
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if (!loongarch_avec.vector_matrix)
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return 0;
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guard(raw_spinlock)(&loongarch_avec.lock);
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irq_matrix_online(loongarch_avec.vector_matrix);
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pending_list_init(cpu);
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return 0;
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}
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static int avecintc_cpu_offline(unsigned int cpu)
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{
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struct pending_list *plist = per_cpu_ptr(&pending_list, cpu);
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if (!loongarch_avec.vector_matrix)
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return 0;
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guard(raw_spinlock)(&loongarch_avec.lock);
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if (!list_empty(&plist->head))
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pr_warn("CPU#%d vector is busy\n", cpu);
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irq_matrix_offline(loongarch_avec.vector_matrix);
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return 0;
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}
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void complete_irq_moving(void)
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{
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struct pending_list *plist = this_cpu_ptr(&pending_list);
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struct avecintc_data *adata, *tdata;
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int cpu, vector, bias;
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uint64_t isr;
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guard(raw_spinlock)(&loongarch_avec.lock);
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list_for_each_entry_safe(adata, tdata, &plist->head, entry) {
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cpu = adata->prev_cpu;
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vector = adata->prev_vec;
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bias = vector / VECTORS_PER_REG;
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switch (bias) {
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case 0:
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isr = csr_read64(LOONGARCH_CSR_ISR0);
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break;
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case 1:
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isr = csr_read64(LOONGARCH_CSR_ISR1);
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break;
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case 2:
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isr = csr_read64(LOONGARCH_CSR_ISR2);
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break;
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case 3:
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isr = csr_read64(LOONGARCH_CSR_ISR3);
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break;
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}
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if (isr & (1UL << (vector % VECTORS_PER_REG))) {
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mp_ops.send_ipi_single(cpu, ACTION_CLEAR_VECTOR);
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continue;
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}
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list_del(&adata->entry);
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irq_matrix_free(loongarch_avec.vector_matrix, cpu, vector, false);
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this_cpu_write(irq_map[vector], NULL);
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adata->moving = 0;
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adata->prev_cpu = adata->cpu;
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adata->prev_vec = adata->vec;
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}
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}
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#endif
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static void avecintc_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
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{
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struct avecintc_data *adata = irq_data_get_irq_chip_data(d);
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msg->address_hi = 0x0;
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msg->address_lo = (loongarch_avec.msi_base_addr | (adata->vec & 0xff) << 4)
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| ((cpu_logical_map(adata->cpu & 0xffff)) << 12);
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msg->data = 0x0;
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}
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static struct irq_chip avec_irq_controller = {
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.name = "AVECINTC",
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.irq_ack = avecintc_ack_irq,
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.irq_mask = avecintc_mask_irq,
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.irq_unmask = avecintc_unmask_irq,
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#ifdef CONFIG_SMP
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.irq_set_affinity = avecintc_set_affinity,
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#endif
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.irq_compose_msi_msg = avecintc_compose_msi_msg,
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};
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static void avecintc_irq_dispatch(struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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struct irq_desc *d;
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chained_irq_enter(chip, desc);
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while (true) {
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unsigned long vector = csr_read64(LOONGARCH_CSR_IRR);
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if (vector & IRR_INVALID_MASK)
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break;
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vector &= IRR_VECTOR_MASK;
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d = this_cpu_read(irq_map[vector]);
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if (d) {
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generic_handle_irq_desc(d);
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} else {
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spurious_interrupt();
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pr_warn("Unexpected IRQ occurs on CPU#%d [vector %ld]\n", smp_processor_id(), vector);
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}
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}
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chained_irq_exit(chip, desc);
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}
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static int avecintc_alloc_vector(struct irq_data *irqd, struct avecintc_data *adata)
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{
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int cpu, ret;
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guard(raw_spinlock_irqsave)(&loongarch_avec.lock);
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ret = irq_matrix_alloc(loongarch_avec.vector_matrix, cpu_online_mask, false, &cpu);
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if (ret < 0)
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return ret;
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adata->prev_cpu = adata->cpu = cpu;
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adata->prev_vec = adata->vec = ret;
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per_cpu_ptr(irq_map, adata->cpu)[adata->vec] = irq_data_to_desc(irqd);
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return 0;
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}
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static int avecintc_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs, void *arg)
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{
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for (unsigned int i = 0; i < nr_irqs; i++) {
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struct irq_data *irqd = irq_domain_get_irq_data(domain, virq + i);
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struct avecintc_data *adata = kzalloc(sizeof(*adata), GFP_KERNEL);
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int ret;
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if (!adata)
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return -ENOMEM;
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ret = avecintc_alloc_vector(irqd, adata);
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if (ret < 0) {
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kfree(adata);
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return ret;
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}
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irq_domain_set_info(domain, virq + i, virq + i, &avec_irq_controller,
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adata, handle_edge_irq, NULL, NULL);
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irqd_set_single_target(irqd);
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irqd_set_affinity_on_activate(irqd);
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}
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return 0;
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}
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static void avecintc_free_vector(struct irq_data *irqd, struct avecintc_data *adata)
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{
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guard(raw_spinlock_irqsave)(&loongarch_avec.lock);
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per_cpu(irq_map, adata->cpu)[adata->vec] = NULL;
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irq_matrix_free(loongarch_avec.vector_matrix, adata->cpu, adata->vec, false);
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#ifdef CONFIG_SMP
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if (!adata->moving)
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return;
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per_cpu(irq_map, adata->prev_cpu)[adata->prev_vec] = NULL;
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irq_matrix_free(loongarch_avec.vector_matrix, adata->prev_cpu, adata->prev_vec, false);
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list_del_init(&adata->entry);
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#endif
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}
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static void avecintc_domain_free(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs)
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{
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for (unsigned int i = 0; i < nr_irqs; i++) {
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struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
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if (d) {
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struct avecintc_data *adata = irq_data_get_irq_chip_data(d);
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avecintc_free_vector(d, adata);
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irq_domain_reset_irq_data(d);
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kfree(adata);
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}
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}
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}
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static const struct irq_domain_ops avecintc_domain_ops = {
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.alloc = avecintc_domain_alloc,
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.free = avecintc_domain_free,
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.select = msi_lib_irq_domain_select,
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};
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static int __init irq_matrix_init(void)
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{
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loongarch_avec.vector_matrix = irq_alloc_matrix(NR_VECTORS, 0, NR_VECTORS);
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if (!loongarch_avec.vector_matrix)
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return -ENOMEM;
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for (int i = 0; i < NR_LEGACY_VECTORS; i++)
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irq_matrix_assign_system(loongarch_avec.vector_matrix, i, false);
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irq_matrix_online(loongarch_avec.vector_matrix);
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return 0;
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}
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static int __init avecintc_init(struct irq_domain *parent)
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{
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int ret, parent_irq;
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unsigned long value;
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raw_spin_lock_init(&loongarch_avec.lock);
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loongarch_avec.fwnode = irq_domain_alloc_named_fwnode("AVECINTC");
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if (!loongarch_avec.fwnode) {
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pr_err("Unable to allocate domain handle\n");
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ret = -ENOMEM;
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goto out;
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}
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loongarch_avec.domain = irq_domain_create_tree(loongarch_avec.fwnode,
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&avecintc_domain_ops, NULL);
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if (!loongarch_avec.domain) {
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pr_err("Unable to create IRQ domain\n");
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ret = -ENOMEM;
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goto out_free_handle;
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}
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parent_irq = irq_create_mapping(parent, INT_AVEC);
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if (!parent_irq) {
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pr_err("Failed to mapping hwirq\n");
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ret = -EINVAL;
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goto out_remove_domain;
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}
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ret = irq_matrix_init();
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if (ret < 0) {
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pr_err("Failed to init irq matrix\n");
|
||||
goto out_remove_domain;
|
||||
}
|
||||
irq_set_chained_handler_and_data(parent_irq, avecintc_irq_dispatch, NULL);
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
pending_list_init(0);
|
||||
cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_AVECINTC_STARTING,
|
||||
"irqchip/loongarch/avecintc:starting",
|
||||
avecintc_cpu_online, avecintc_cpu_offline);
|
||||
#endif
|
||||
value = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC);
|
||||
value |= IOCSR_MISC_FUNC_AVEC_EN;
|
||||
iocsr_write64(value, LOONGARCH_IOCSR_MISC_FUNC);
|
||||
|
||||
return ret;
|
||||
|
||||
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;
|
||||
|
||||
loongarch_avec.msi_base_addr = pchmsi_entry->msg_address - AVEC_MSG_OFFSET;
|
||||
|
||||
return pch_msi_acpi_init_avec(loongarch_avec.domain);
|
||||
}
|
||||
|
||||
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 avecintc_acpi_init(struct irq_domain *parent)
|
||||
{
|
||||
int ret = avecintc_init(parent);
|
||||
if (ret < 0) {
|
||||
pr_err("Failed to init IRQ domain\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = acpi_cascade_irqdomain_init();
|
||||
if (ret < 0) {
|
||||
pr_err("Failed to init cascade IRQ domain\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
@ -140,7 +140,10 @@ static int __init acpi_cascade_irqdomain_init(void)
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
return 0;
|
||||
if (cpu_has_avecint)
|
||||
r = avecintc_acpi_init(irq_domain);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static int __init cpuintc_acpi_init(union acpi_subtable_headers *header,
|
||||
|
||||
@ -362,6 +362,9 @@ 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;
|
||||
|
||||
@ -278,4 +278,18 @@ int __init pch_msi_acpi_init(struct irq_domain *parent, struct acpi_madt_msi_pic
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int __init pch_msi_acpi_init_avec(struct irq_domain *parent)
|
||||
{
|
||||
if (pch_msi_handle[0])
|
||||
return 0;
|
||||
|
||||
pch_msi_handle[0] = parent->fwnode;
|
||||
irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
|
||||
|
||||
parent->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
|
||||
parent->msi_parent_ops = &pch_msi_parent_ops;
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
@ -12,6 +12,7 @@ int liointc_acpi_init(struct irq_domain *parent,
|
||||
struct acpi_madt_lio_pic *acpi_liointc);
|
||||
int eiointc_acpi_init(struct irq_domain *parent,
|
||||
struct acpi_madt_eio_pic *acpi_eiointc);
|
||||
int avecintc_acpi_init(struct irq_domain *parent);
|
||||
|
||||
int htvec_acpi_init(struct irq_domain *parent,
|
||||
struct acpi_madt_ht_pic *acpi_htvec);
|
||||
@ -21,5 +22,6 @@ int pch_pic_acpi_init(struct irq_domain *parent,
|
||||
struct acpi_madt_bio_pic *acpi_pchpic);
|
||||
int pch_msi_acpi_init(struct irq_domain *parent,
|
||||
struct acpi_madt_msi_pic *acpi_pchmsi);
|
||||
int pch_msi_acpi_init_avec(struct irq_domain *parent);
|
||||
|
||||
#endif /* _DRIVERS_IRQCHIP_IRQ_LOONGSON_H */
|
||||
|
||||
@ -146,6 +146,7 @@ enum cpuhp_state {
|
||||
CPUHP_AP_IRQ_BCM2836_STARTING,
|
||||
CPUHP_AP_IRQ_MIPS_GIC_STARTING,
|
||||
CPUHP_AP_IRQ_EIOINTC_STARTING,
|
||||
CPUHP_AP_IRQ_AVECINTC_STARTING,
|
||||
CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
|
||||
CPUHP_AP_IRQ_RISCV_IMSIC_STARTING,
|
||||
CPUHP_AP_ARM_MVEBU_COHERENCY,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user