xics.h 3.4 KB

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