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