1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 * Copyright (C) 2017 SiFive 5 * Copyright (C) 2018 Christoph Hellwig 6 */ 7 8 #include <linux/interrupt.h> 9 #include <linux/irqchip.h> 10 #include <linux/irqdomain.h> 11 #include <linux/module.h> 12 #include <linux/seq_file.h> 13 #include <asm/sbi.h> 14 #include <asm/smp.h> 15 #include <asm/softirq_stack.h> 16 #include <asm/stacktrace.h> 17 18 static struct fwnode_handle *(*__get_intc_node)(void); 19 20 void riscv_set_intc_hwnode_fn(struct fwnode_handle *(*fn)(void)) 21 { 22 __get_intc_node = fn; 23 } 24 25 struct fwnode_handle *riscv_get_intc_hwnode(void) 26 { 27 if (__get_intc_node) 28 return __get_intc_node(); 29 30 return NULL; 31 } 32 EXPORT_SYMBOL_GPL(riscv_get_intc_hwnode); 33 34 #ifdef CONFIG_IRQ_STACKS 35 #include <asm/irq_stack.h> 36 37 DEFINE_PER_CPU(ulong *, irq_stack_ptr); 38 39 #ifdef CONFIG_VMAP_STACK 40 static void init_irq_stacks(void) 41 { 42 int cpu; 43 ulong *p; 44 45 for_each_possible_cpu(cpu) { 46 p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu)); 47 per_cpu(irq_stack_ptr, cpu) = p; 48 } 49 } 50 #else 51 /* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */ 52 DEFINE_PER_CPU_ALIGNED(ulong [IRQ_STACK_SIZE/sizeof(ulong)], irq_stack); 53 54 static void init_irq_stacks(void) 55 { 56 int cpu; 57 58 for_each_possible_cpu(cpu) 59 per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu); 60 } 61 #endif /* CONFIG_VMAP_STACK */ 62 63 #ifdef CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK 64 void do_softirq_own_stack(void) 65 { 66 #ifdef CONFIG_IRQ_STACKS 67 if (on_thread_stack()) { 68 ulong *sp = per_cpu(irq_stack_ptr, smp_processor_id()) 69 + IRQ_STACK_SIZE/sizeof(ulong); 70 __asm__ __volatile( 71 "addi sp, sp, -"RISCV_SZPTR "\n" 72 REG_S" ra, (sp) \n" 73 "addi sp, sp, -"RISCV_SZPTR "\n" 74 REG_S" s0, (sp) \n" 75 "addi s0, sp, 2*"RISCV_SZPTR "\n" 76 "move sp, %[sp] \n" 77 "call __do_softirq \n" 78 "addi sp, s0, -2*"RISCV_SZPTR"\n" 79 REG_L" s0, (sp) \n" 80 "addi sp, sp, "RISCV_SZPTR "\n" 81 REG_L" ra, (sp) \n" 82 "addi sp, sp, "RISCV_SZPTR "\n" 83 : 84 : [sp] "r" (sp) 85 : "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", 86 "t0", "t1", "t2", "t3", "t4", "t5", "t6", 87 #ifndef CONFIG_FRAME_POINTER 88 "s0", 89 #endif 90 "memory"); 91 } else 92 #endif 93 __do_softirq(); 94 } 95 #endif /* CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK */ 96 97 #else 98 static void init_irq_stacks(void) {} 99 #endif /* CONFIG_IRQ_STACKS */ 100 101 int arch_show_interrupts(struct seq_file *p, int prec) 102 { 103 show_ipi_stats(p, prec); 104 return 0; 105 } 106 107 void __init init_IRQ(void) 108 { 109 init_irq_stacks(); 110 irqchip_init(); 111 if (!handle_arch_irq) 112 panic("No interrupt controller found."); 113 sbi_ipi_init(); 114 } 115