arch/powerpc/include/asm/xics.h

   1 /*
   2  * Common definitions accross all variants of ICP and ICS interrupt
   3  * controllers.
   4  */
   5
   6 #ifndef _XICS_H
   7 #define _XICS_H
   8
   9 #define XICS_IPI                2
  10 #define XICS_IRQ_SPURIOUS       0
  11
  12 /* Want a priority other than 0.  Various HW issues require this. */
  13 #define DEFAULT_PRIORITY        5
  14
  15 /*
  16  * Mark IPIs as higher priority so we can take them inside interrupts that
  17  * arent marked IRQF_DISABLED
  18  */
  19 #define IPI_PRIORITY            4
  20
  21 /* The least favored priority */
  22 #define LOWEST_PRIORITY         0xFF
  23
  24 /* The number of priorities defined above */
  25 #define MAX_NUM_PRIORITIES      3
  26
  27 /* Native ICP */
  28 extern int icp_native_init(void);
  29
  30 /* PAPR ICP */
  31 extern int icp_hv_init(void);
  32
  33 /* ICP ops */
  34 struct icp_ops {
  35         unsigned int (*get_irq)(void);
  36         void (*eoi)(struct irq_data *d);
  37         void (*set_priority)(unsigned char prio);
  38         void (*teardown_cpu)(void);
  39         void (*flush_ipi)(void);
  40 #ifdef CONFIG_SMP
  41         void (*message_pass)(int target, int msg);
  42         irq_handler_t ipi_action;
  43 #endif
  44 };
  45
  46 extern const struct icp_ops *icp_ops;
  47
  48 /* Native ICS */
  49 extern int ics_native_init(void);
  50
  51 /* RTAS ICS */
  52 extern int ics_rtas_init(void);
  53
  54 /* ICS instance, hooked up to chip_data of an irq */
  55 struct ics {
  56         struct list_head link;
  57         int (*map)(struct ics *ics, unsigned int virq);
  58         void (*mask_unknown)(struct ics *ics, unsigned long vec);
  59         long (*get_server)(struct ics *ics, unsigned long vec);
  60         char data[];
  61 };
  62
  63 /* Commons */
  64 extern unsigned int xics_default_server;
  65 extern unsigned int xics_default_distrib_server;
  66 extern unsigned int xics_interrupt_server_size;
  67 extern struct irq_host *xics_host;
  68
  69 struct xics_cppr {
  70         unsigned char stack[MAX_NUM_PRIORITIES];
  71         int index;
  72 };
  73
  74 DECLARE_PER_CPU(struct xics_cppr, xics_cppr);
  75
  76 static inline void xics_push_cppr(unsigned int vec)
  77 {
  78         struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
  79
  80         if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1))
  81                 return;
  82
  83         if (vec == XICS_IPI)
  84                 os_cppr->stack[++os_cppr->index] = IPI_PRIORITY;
  85         else
  86                 os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY;
  87 }
  88
  89 static inline unsigned char xics_pop_cppr(void)
  90 {
  91         struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
  92
  93         if (WARN_ON(os_cppr->index < 1))
  94                 return LOWEST_PRIORITY;
  95
  96         return os_cppr->stack[--os_cppr->index];
  97 }
  98
  99 static inline void xics_set_base_cppr(unsigned char cppr)
 100 {
 101         struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
 102
 103         /* we only really want to set the priority when there's
 104          * just one cppr value on the stack
 105          */
 106         WARN_ON(os_cppr->index != 0);
 107
 108         os_cppr->stack[0] = cppr;
 109 }
 110
 111 static inline unsigned char xics_cppr_top(void)
 112 {
 113         struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
 114
 115         return os_cppr->stack[os_cppr->index];
 116 }
 117
 118 DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message);
 119
 120 extern void xics_init(void);
 121 extern void xics_setup_cpu(void);
 122 extern void xics_update_irq_servers(void);
 123 extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join);
 124 extern void xics_mask_unknown_vec(unsigned int vec);
 125 extern irqreturn_t xics_ipi_dispatch(int cpu);
 126 extern int xics_smp_probe(void);
 127 extern void xics_register_ics(struct ics *ics);
 128 extern void xics_teardown_cpu(void);
 129 extern void xics_kexec_teardown_cpu(int secondary);
 130 extern void xics_migrate_irqs_away(void);
 131 #ifdef CONFIG_SMP
 132 extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
 133                                unsigned int strict_check);
 134 #else
 135 #define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server)
 136 #endif
 137
 138
 139 #endif /* _XICS_H */