kernel/irq/internals.h

   1 /*
   2  * IRQ subsystem internal functions and variables:
   3  */
   4 #include <linux/irqdesc.h>
   5
   6 extern int noirqdebug;
   7
   8 #define irq_data_to_desc(data)  container_of(data, struct irq_desc, irq_data)
   9
  10 /* Set default functions for irq_chip structures: */
  11 extern void irq_chip_set_defaults(struct irq_chip *chip);
  12
  13 /* Set default handler: */
  14 extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
  15
  16 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  17                 unsigned long flags);
  18 extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
  19 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
  20
  21 extern struct lock_class_key irq_desc_lock_class;
  22 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  23 extern void clear_kstat_irqs(struct irq_desc *desc);
  24 extern raw_spinlock_t sparse_irq_lock;
  25
  26 /* Resending of interrupts :*/
  27 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  28
  29 #ifdef CONFIG_SPARSE_IRQ
  30 void replace_irq_desc(unsigned int irq, struct irq_desc *desc);
  31 #endif
  32
  33 #ifdef CONFIG_PROC_FS
  34 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  35 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
  36 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
  37 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
  38 #else
  39 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  40 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  41 static inline void register_handler_proc(unsigned int irq,
  42                                          struct irqaction *action) { }
  43 static inline void unregister_handler_proc(unsigned int irq,
  44                                            struct irqaction *action) { }
  45 #endif
  46
  47 extern int irq_select_affinity_usr(unsigned int irq);
  48
  49 extern void irq_set_thread_affinity(struct irq_desc *desc);
  50
  51 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
  52 static inline void irq_end(unsigned int irq, struct irq_desc *desc)
  53 {
  54         if (desc->irq_data.chip && desc->irq_data.chip->end)
  55                 desc->irq_data.chip->end(irq);
  56 }
  57 #else
  58 static inline void irq_end(unsigned int irq, struct irq_desc *desc) { }
  59 #endif
  60
  61 /* Inline functions for support of irq chips on slow busses */
  62 static inline void chip_bus_lock(struct irq_desc *desc)
  63 {
  64         if (unlikely(desc->irq_data.chip->irq_bus_lock))
  65                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
  66 }
  67
  68 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
  69 {
  70         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
  71                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
  72 }
  73
  74 /*
  75  * Debugging printout:
  76  */
  77
  78 #include <linux/kallsyms.h>
  79
  80 #define P(f) if (desc->status & f) printk("%14s set\n", #f)
  81
  82 static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
  83 {
  84         printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n",
  85                 irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled);
  86         printk("->handle_irq():  %p, ", desc->handle_irq);
  87         print_symbol("%s\n", (unsigned long)desc->handle_irq);
  88         printk("->irq_data.chip(): %p, ", desc->irq_data.chip);
  89         print_symbol("%s\n", (unsigned long)desc->irq_data.chip);
  90         printk("->action(): %p\n", desc->action);
  91         if (desc->action) {
  92                 printk("->action->handler(): %p, ", desc->action->handler);
  93                 print_symbol("%s\n", (unsigned long)desc->action->handler);
  94         }
  95
  96         P(IRQ_INPROGRESS);
  97         P(IRQ_DISABLED);
  98         P(IRQ_PENDING);
  99         P(IRQ_REPLAY);
 100         P(IRQ_AUTODETECT);
 101         P(IRQ_WAITING);
 102         P(IRQ_LEVEL);
 103         P(IRQ_MASKED);
 104 #ifdef CONFIG_IRQ_PER_CPU
 105         P(IRQ_PER_CPU);
 106 #endif
 107         P(IRQ_NOPROBE);
 108         P(IRQ_NOREQUEST);
 109         P(IRQ_NOAUTOEN);
 110 }
 111
 112 #undef P
 113
 114 /* Stuff below will be cleaned up after the sparse allocator is done */
 115
 116 #ifdef CONFIG_SMP
 117 /**
 118  * alloc_desc_masks - allocate cpumasks for irq_desc
 119  * @desc:       pointer to irq_desc struct
 120  * @node:       node which will be handling the cpumasks
 121  * @boot:       true if need bootmem
 122  *
 123  * Allocates affinity and pending_mask cpumask if required.
 124  * Returns true if successful (or not required).
 125  */
 126 static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
 127                                                         bool boot)
 128 {
 129         gfp_t gfp = GFP_ATOMIC;
 130
 131         if (boot)
 132                 gfp = GFP_NOWAIT;
 133
 134 #ifdef CONFIG_CPUMASK_OFFSTACK
 135         if (!alloc_cpumask_var_node(&desc->irq_data.affinity, gfp, node))
 136                 return false;
 137
 138 #ifdef CONFIG_GENERIC_PENDING_IRQ
 139         if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
 140                 free_cpumask_var(desc->irq_data.affinity);
 141                 return false;
 142         }
 143 #endif
 144 #endif
 145         return true;
 146 }
 147
 148 static inline void init_desc_masks(struct irq_desc *desc)
 149 {
 150         cpumask_setall(desc->irq_data.affinity);
 151 #ifdef CONFIG_GENERIC_PENDING_IRQ
 152         cpumask_clear(desc->pending_mask);
 153 #endif
 154 }
 155
 156 /**
 157  * init_copy_desc_masks - copy cpumasks for irq_desc
 158  * @old_desc:   pointer to old irq_desc struct
 159  * @new_desc:   pointer to new irq_desc struct
 160  *
 161  * Insures affinity and pending_masks are copied to new irq_desc.
 162  * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
 163  * irq_desc struct so the copy is redundant.
 164  */
 165
 166 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 167                                         struct irq_desc *new_desc)
 168 {
 169 #ifdef CONFIG_CPUMASK_OFFSTACK
 170         cpumask_copy(new_desc->irq_data.affinity, old_desc->irq_data.affinity);
 171
 172 #ifdef CONFIG_GENERIC_PENDING_IRQ
 173         cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
 174 #endif
 175 #endif
 176 }
 177
 178 static inline void free_desc_masks(struct irq_desc *old_desc,
 179                                    struct irq_desc *new_desc)
 180 {
 181         free_cpumask_var(old_desc->irq_data.affinity);
 182
 183 #ifdef CONFIG_GENERIC_PENDING_IRQ
 184         free_cpumask_var(old_desc->pending_mask);
 185 #endif
 186 }
 187
 188 #else /* !CONFIG_SMP */
 189
 190 static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
 191                                                                 bool boot)
 192 {
 193         return true;
 194 }
 195
 196 static inline void init_desc_masks(struct irq_desc *desc)
 197 {
 198 }
 199
 200 static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 201                                         struct irq_desc *new_desc)
 202 {
 203 }
 204
 205 static inline void free_desc_masks(struct irq_desc *old_desc,
 206                                    struct irq_desc *new_desc)
 207 {
 208 }
 209 #endif  /* CONFIG_SMP */