xics.h (4539B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Common definitions across all variants of ICP and ICS interrupt 4 * controllers. 5 */ 6 7#ifndef _XICS_H 8#define _XICS_H 9 10#include <linux/interrupt.h> 11 12#define XICS_IPI 2 13#define XICS_IRQ_SPURIOUS 0 14 15/* Want a priority other than 0. Various HW issues require this. */ 16#define DEFAULT_PRIORITY 5 17 18/* 19 * Mark IPIs as higher priority so we can take them inside interrupts 20 * FIXME: still true now? 21 */ 22#define IPI_PRIORITY 4 23 24/* The least favored priority */ 25#define LOWEST_PRIORITY 0xFF 26 27/* The number of priorities defined above */ 28#define MAX_NUM_PRIORITIES 3 29 30/* Native ICP */ 31#ifdef CONFIG_PPC_ICP_NATIVE 32extern int icp_native_init(void); 33extern void icp_native_flush_interrupt(void); 34extern void icp_native_cause_ipi_rm(int cpu); 35#else 36static inline int icp_native_init(void) { return -ENODEV; } 37#endif 38 39/* PAPR ICP */ 40#ifdef CONFIG_PPC_ICP_HV 41int __init icp_hv_init(void); 42#else 43static inline int icp_hv_init(void) { return -ENODEV; } 44#endif 45 46#ifdef CONFIG_PPC_POWERNV 47int __init icp_opal_init(void); 48extern void icp_opal_flush_interrupt(void); 49#else 50static inline int icp_opal_init(void) { return -ENODEV; } 51#endif 52 53/* ICP ops */ 54struct icp_ops { 55 unsigned int (*get_irq)(void); 56 void (*eoi)(struct irq_data *d); 57 void (*set_priority)(unsigned char prio); 58 void (*teardown_cpu)(void); 59 void (*flush_ipi)(void); 60#ifdef CONFIG_SMP 61 void (*cause_ipi)(int cpu); 62 irq_handler_t ipi_action; 63#endif 64}; 65 66extern const struct icp_ops *icp_ops; 67 68#ifdef CONFIG_PPC_ICS_NATIVE 69/* Native ICS */ 70extern int ics_native_init(void); 71#else 72static inline int ics_native_init(void) { return -ENODEV; } 73#endif 74 75/* RTAS ICS */ 76#ifdef CONFIG_PPC_ICS_RTAS 77extern int ics_rtas_init(void); 78#else 79static inline int ics_rtas_init(void) { return -ENODEV; } 80#endif 81 82/* HAL ICS */ 83#ifdef CONFIG_PPC_POWERNV 84extern int ics_opal_init(void); 85#else 86static inline int ics_opal_init(void) { return -ENODEV; } 87#endif 88 89/* ICS instance, hooked up to chip_data of an irq */ 90struct ics { 91 struct list_head link; 92 int (*check)(struct ics *ics, unsigned int hwirq); 93 void (*mask_unknown)(struct ics *ics, unsigned long vec); 94 long (*get_server)(struct ics *ics, unsigned long vec); 95 int (*host_match)(struct ics *ics, struct device_node *node); 96 struct irq_chip *chip; 97 char data[]; 98}; 99 100/* Commons */ 101extern unsigned int xics_default_server; 102extern unsigned int xics_default_distrib_server; 103extern unsigned int xics_interrupt_server_size; 104extern struct irq_domain *xics_host; 105 106struct xics_cppr { 107 unsigned char stack[MAX_NUM_PRIORITIES]; 108 int index; 109}; 110 111DECLARE_PER_CPU(struct xics_cppr, xics_cppr); 112 113static inline void xics_push_cppr(unsigned int vec) 114{ 115 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 116 117 if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1)) 118 return; 119 120 if (vec == XICS_IPI) 121 os_cppr->stack[++os_cppr->index] = IPI_PRIORITY; 122 else 123 os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY; 124} 125 126static inline unsigned char xics_pop_cppr(void) 127{ 128 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 129 130 if (WARN_ON(os_cppr->index < 1)) 131 return LOWEST_PRIORITY; 132 133 return os_cppr->stack[--os_cppr->index]; 134} 135 136static inline void xics_set_base_cppr(unsigned char cppr) 137{ 138 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 139 140 /* we only really want to set the priority when there's 141 * just one cppr value on the stack 142 */ 143 WARN_ON(os_cppr->index != 0); 144 145 os_cppr->stack[0] = cppr; 146} 147 148static inline unsigned char xics_cppr_top(void) 149{ 150 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 151 152 return os_cppr->stack[os_cppr->index]; 153} 154 155DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message); 156 157extern void xics_init(void); 158extern void xics_setup_cpu(void); 159extern void xics_update_irq_servers(void); 160extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join); 161extern void xics_mask_unknown_vec(unsigned int vec); 162extern irqreturn_t xics_ipi_dispatch(int cpu); 163extern void xics_smp_probe(void); 164extern void xics_register_ics(struct ics *ics); 165extern void xics_teardown_cpu(void); 166extern void xics_kexec_teardown_cpu(int secondary); 167extern void xics_migrate_irqs_away(void); 168extern void icp_native_eoi(struct irq_data *d); 169extern int xics_set_irq_type(struct irq_data *d, unsigned int flow_type); 170extern int xics_retrigger(struct irq_data *data); 171#ifdef CONFIG_SMP 172extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask, 173 unsigned int strict_check); 174#else 175#define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server) 176#endif 177 178 179#endif /* _XICS_H */