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-rw-r--r--include/linux/irq.h123
1 files changed, 123 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 069d3b84d311..4a362b9ec966 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -71,16 +71,139 @@ typedef struct irq_desc {
71 unsigned int irq_count; /* For detecting broken interrupts */ 71 unsigned int irq_count; /* For detecting broken interrupts */
72 unsigned int irqs_unhandled; 72 unsigned int irqs_unhandled;
73 spinlock_t lock; 73 spinlock_t lock;
74#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
75 unsigned int move_irq; /* Flag need to re-target intr dest*/
76#endif
74} ____cacheline_aligned irq_desc_t; 77} ____cacheline_aligned irq_desc_t;
75 78
76extern irq_desc_t irq_desc [NR_IRQS]; 79extern irq_desc_t irq_desc [NR_IRQS];
77 80
81/* Return a pointer to the irq descriptor for IRQ. */
82static inline irq_desc_t *
83irq_descp (int irq)
84{
85 return irq_desc + irq;
86}
87
78#include <asm/hw_irq.h> /* the arch dependent stuff */ 88#include <asm/hw_irq.h> /* the arch dependent stuff */
79 89
80extern int setup_irq(unsigned int irq, struct irqaction * new); 90extern int setup_irq(unsigned int irq, struct irqaction * new);
81 91
82#ifdef CONFIG_GENERIC_HARDIRQS 92#ifdef CONFIG_GENERIC_HARDIRQS
83extern cpumask_t irq_affinity[NR_IRQS]; 93extern cpumask_t irq_affinity[NR_IRQS];
94
95#ifdef CONFIG_SMP
96static inline void set_native_irq_info(int irq, cpumask_t mask)
97{
98 irq_affinity[irq] = mask;
99}
100#else
101static inline void set_native_irq_info(int irq, cpumask_t mask)
102{
103}
104#endif
105
106#ifdef CONFIG_SMP
107
108#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
109extern cpumask_t pending_irq_cpumask[NR_IRQS];
110
111static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
112{
113 irq_desc_t *desc = irq_desc + irq;
114 unsigned long flags;
115
116 spin_lock_irqsave(&desc->lock, flags);
117 desc->move_irq = 1;
118 pending_irq_cpumask[irq] = mask;
119 spin_unlock_irqrestore(&desc->lock, flags);
120}
121
122static inline void
123move_native_irq(int irq)
124{
125 cpumask_t tmp;
126 irq_desc_t *desc = irq_descp(irq);
127
128 if (likely (!desc->move_irq))
129 return;
130
131 desc->move_irq = 0;
132
133 if (likely(cpus_empty(pending_irq_cpumask[irq])))
134 return;
135
136 if (!desc->handler->set_affinity)
137 return;
138
139 /* note - we hold the desc->lock */
140 cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
141
142 /*
143 * If there was a valid mask to work with, please
144 * do the disable, re-program, enable sequence.
145 * This is *not* particularly important for level triggered
146 * but in a edge trigger case, we might be setting rte
147 * when an active trigger is comming in. This could
148 * cause some ioapics to mal-function.
149 * Being paranoid i guess!
150 */
151 if (unlikely(!cpus_empty(tmp))) {
152 desc->handler->disable(irq);
153 desc->handler->set_affinity(irq,tmp);
154 desc->handler->enable(irq);
155 }
156 cpus_clear(pending_irq_cpumask[irq]);
157}
158
159#ifdef CONFIG_PCI_MSI
160/*
161 * Wonder why these are dummies?
162 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
163 * counter part after translating the vector to irq info. We need to perform
164 * this operation on the real irq, when we dont use vector, i.e when
165 * pci_use_vector() is false.
166 */
167static inline void move_irq(int irq)
168{
169}
170
171static inline void set_irq_info(int irq, cpumask_t mask)
172{
173}
174
175#else // CONFIG_PCI_MSI
176
177static inline void move_irq(int irq)
178{
179 move_native_irq(irq);
180}
181
182static inline void set_irq_info(int irq, cpumask_t mask)
183{
184 set_native_irq_info(irq, mask);
185}
186#endif // CONFIG_PCI_MSI
187
188#else // CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
189
190#define move_irq(x)
191#define move_native_irq(x)
192#define set_pending_irq(x,y)
193static inline void set_irq_info(int irq, cpumask_t mask)
194{
195 set_native_irq_info(irq, mask);
196}
197
198#endif // CONFIG_GENERIC_PENDING_IRQ
199
200#else // CONFIG_SMP
201
202#define move_irq(x)
203#define move_native_irq(x)
204
205#endif // CONFIG_SMP
206
84extern int no_irq_affinity; 207extern int no_irq_affinity;
85extern int noirqdebug_setup(char *str); 208extern int noirqdebug_setup(char *str);
86 209