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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
31extern int icp_native_init(void);
32#else
33static inline int icp_native_init(void) { return -ENODEV; }
34#endif
35
36/* PAPR ICP */
37#ifdef CONFIG_PPC_ICP_HV
38extern int icp_hv_init(void);
39#else
40static inline int icp_hv_init(void) { return -ENODEV; }
41#endif
42
43/* ICP ops */
44struct icp_ops {
45 unsigned int (*get_irq)(void);
46 void (*eoi)(struct irq_data *d);
47 void (*set_priority)(unsigned char prio);
48 void (*teardown_cpu)(void);
49 void (*flush_ipi)(void);
50#ifdef CONFIG_SMP
51 void (*cause_ipi)(int cpu, unsigned long data);
52 irq_handler_t ipi_action;
53#endif
54};
55
56extern const struct icp_ops *icp_ops;
57
58/* Native ICS */
59extern int ics_native_init(void);
60
61/* RTAS ICS */
62#ifdef CONFIG_PPC_ICS_RTAS
63extern int ics_rtas_init(void);
64#else
65static inline int ics_rtas_init(void) { return -ENODEV; }
66#endif
67
68/* HAL ICS */
69#ifdef CONFIG_PPC_POWERNV
70extern int ics_opal_init(void);
71#else
72static inline int ics_opal_init(void) { return -ENODEV; }
73#endif
74
75/* ICS instance, hooked up to chip_data of an irq */
76struct 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 */
86extern unsigned int xics_default_server;
87extern unsigned int xics_default_distrib_server;
88extern unsigned int xics_interrupt_server_size;
89extern struct irq_domain *xics_host;
90
91struct xics_cppr {
92 unsigned char stack[MAX_NUM_PRIORITIES];
93 int index;
94};
95
96DECLARE_PER_CPU(struct xics_cppr, xics_cppr);
97
98static 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
111static 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
121static 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
133static 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
140DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message);
141
142extern void xics_init(void);
143extern void xics_setup_cpu(void);
144extern void xics_update_irq_servers(void);
145extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join);
146extern void xics_mask_unknown_vec(unsigned int vec);
147extern irqreturn_t xics_ipi_dispatch(int cpu);
148extern int xics_smp_probe(void);
149extern void xics_register_ics(struct ics *ics);
150extern void xics_teardown_cpu(void);
151extern void xics_kexec_teardown_cpu(int secondary);
152extern void xics_migrate_irqs_away(void);
153extern void icp_native_eoi(struct irq_data *d);
154#ifdef CONFIG_SMP
155extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
156 unsigned int strict_check);
157#else
158#define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server)
159#endif
160
161
162#endif /* _XICS_H */