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 32 extern int icp_native_init(void); 33 extern void icp_native_flush_interrupt(void); 34 extern void icp_native_cause_ipi_rm(int cpu); 35 #else 36 static inline int icp_native_init(void) { return -ENODEV; } 37 #endif 38 39 /* PAPR ICP */ 40 #ifdef CONFIG_PPC_ICP_HV 41 extern int icp_hv_init(void); 42 #else 43 static inline int icp_hv_init(void) { return -ENODEV; } 44 #endif 45 46 #ifdef CONFIG_PPC_POWERNV 47 extern int icp_opal_init(void); 48 extern void icp_opal_flush_interrupt(void); 49 #else 50 static inline int icp_opal_init(void) { return -ENODEV; } 51 #endif 52 53 /* ICP ops */ 54 struct 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 66 extern const struct icp_ops *icp_ops; 67 68 #ifdef CONFIG_PPC_ICS_NATIVE 69 /* Native ICS */ 70 extern int ics_native_init(void); 71 #else 72 static inline int ics_native_init(void) { return -ENODEV; } 73 #endif 74 75 /* RTAS ICS */ 76 #ifdef CONFIG_PPC_ICS_RTAS 77 extern int ics_rtas_init(void); 78 #else 79 static inline int ics_rtas_init(void) { return -ENODEV; } 80 #endif 81 82 /* HAL ICS */ 83 #ifdef CONFIG_PPC_POWERNV 84 extern int ics_opal_init(void); 85 #else 86 static inline int ics_opal_init(void) { return -ENODEV; } 87 #endif 88 89 /* ICS instance, hooked up to chip_data of an irq */ 90 struct 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 */ 101 extern unsigned int xics_default_server; 102 extern unsigned int xics_default_distrib_server; 103 extern unsigned int xics_interrupt_server_size; 104 extern struct irq_domain *xics_host; 105 106 struct xics_cppr { 107 unsigned char stack[MAX_NUM_PRIORITIES]; 108 int index; 109 }; 110 111 DECLARE_PER_CPU(struct xics_cppr, xics_cppr); 112 113 static 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 } 125 126 static 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 } 135 136 static 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 } 147 148 static 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 } 154 155 DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message); 156 157 extern void xics_init(void); 158 extern void xics_setup_cpu(void); 159 extern void xics_update_irq_servers(void); 160 extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join); 161 extern void xics_mask_unknown_vec(unsigned int vec); 162 extern irqreturn_t xics_ipi_dispatch(int cpu); 163 extern void xics_smp_probe(void); 164 extern void xics_register_ics(struct ics *ics); 165 extern void xics_teardown_cpu(void); 166 extern void xics_kexec_teardown_cpu(int secondary); 167 extern void xics_migrate_irqs_away(void); 168 extern void icp_native_eoi(struct irq_data *d); 169 extern int xics_set_irq_type(struct irq_data *d, unsigned int flow_type); 170 extern int xics_retrigger(struct irq_data *data); 171 #ifdef CONFIG_SMP 172 extern 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 */ 180