arch/powerpc/include/asm/xics.h

   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 /* Native ICS */
  69 extern int ics_native_init(void);
  70
  71 /* RTAS ICS */
  72 #ifdef CONFIG_PPC_ICS_RTAS
  73 extern int ics_rtas_init(void);
  74 #else
  75 static inline int ics_rtas_init(void) { return -ENODEV; }
  76 #endif
  77
  78 /* HAL ICS */
  79 #ifdef CONFIG_PPC_POWERNV
  80 extern int ics_opal_init(void);
  81 #else
  82 static inline int ics_opal_init(void) { return -ENODEV; }
  83 #endif
  84
  85 /* ICS instance, hooked up to chip_data of an irq */
  86 struct ics {
  87         struct list_head link;
  88         int (*map)(struct ics *ics, unsigned int virq);
  89         void (*mask_unknown)(struct ics *ics, unsigned long vec);
  90         long (*get_server)(struct ics *ics, unsigned long vec);
  91         int (*host_match)(struct ics *ics, struct device_node *node);
  92         char data[];
  93 };
  94
  95 /* Commons */
  96 extern unsigned int xics_default_server;
  97 extern unsigned int xics_default_distrib_server;
  98 extern unsigned int xics_interrupt_server_size;
  99 extern struct irq_domain *xics_host;
 100
 101 struct xics_cppr {
 102         unsigned char stack[MAX_NUM_PRIORITIES];
 103         int index;
 104 };
 105
 106 DECLARE_PER_CPU(struct xics_cppr, xics_cppr);
 107
 108 static inline void xics_push_cppr(unsigned int vec)
 109 {
 110         struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
 111
 112         if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1))
 113                 return;
 114
 115         if (vec == XICS_IPI)
 116                 os_cppr->stack[++os_cppr->index] = IPI_PRIORITY;
 117         else
 118                 os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY;
 119 }
 120
 121 static inline unsigned char xics_pop_cppr(void)
 122 {
 123         struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
 124
 125         if (WARN_ON(os_cppr->index < 1))
 126                 return LOWEST_PRIORITY;
 127
 128         return os_cppr->stack[--os_cppr->index];
 129 }
 130
 131 static inline void xics_set_base_cppr(unsigned char cppr)
 132 {
 133         struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
 134
 135         /* we only really want to set the priority when there's
 136          * just one cppr value on the stack
 137          */
 138         WARN_ON(os_cppr->index != 0);
 139
 140         os_cppr->stack[0] = cppr;
 141 }
 142
 143 static inline unsigned char xics_cppr_top(void)
 144 {
 145         struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
 146
 147         return os_cppr->stack[os_cppr->index];
 148 }
 149
 150 DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message);
 151
 152 extern void xics_init(void);
 153 extern void xics_setup_cpu(void);
 154 extern void xics_update_irq_servers(void);
 155 extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join);
 156 extern void xics_mask_unknown_vec(unsigned int vec);
 157 extern irqreturn_t xics_ipi_dispatch(int cpu);
 158 extern void xics_smp_probe(void);
 159 extern void xics_register_ics(struct ics *ics);
 160 extern void xics_teardown_cpu(void);
 161 extern void xics_kexec_teardown_cpu(int secondary);
 162 extern void xics_migrate_irqs_away(void);
 163 extern void icp_native_eoi(struct irq_data *d);
 164 extern int xics_set_irq_type(struct irq_data *d, unsigned int flow_type);
 165 extern int xics_retrigger(struct irq_data *data);
 166 #ifdef CONFIG_SMP
 167 extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
 168                                unsigned int strict_check);
 169 #else
 170 #define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server)
 171 #endif
 172
 173
 174 #endif /* _XICS_H */