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TOMOYO Linux Cross Reference
Linux/include/linux/irqdomain.h

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  1 /*
  2  * irq_domain - IRQ translation domains
  3  *
  4  * Translation infrastructure between hw and linux irq numbers.  This is
  5  * helpful for interrupt controllers to implement mapping between hardware
  6  * irq numbers and the Linux irq number space.
  7  *
  8  * irq_domains also have hooks for translating device tree or other
  9  * firmware interrupt representations into a hardware irq number that
 10  * can be mapped back to a Linux irq number without any extra platform
 11  * support code.
 12  *
 13  * Interrupt controller "domain" data structure. This could be defined as a
 14  * irq domain controller. That is, it handles the mapping between hardware
 15  * and virtual interrupt numbers for a given interrupt domain. The domain
 16  * structure is generally created by the PIC code for a given PIC instance
 17  * (though a domain can cover more than one PIC if they have a flat number
 18  * model). It's the domain callbacks that are responsible for setting the
 19  * irq_chip on a given irq_desc after it's been mapped.
 20  *
 21  * The host code and data structures use a fwnode_handle pointer to
 22  * identify the domain. In some cases, and in order to preserve source
 23  * code compatibility, this fwnode pointer is "upgraded" to a DT
 24  * device_node. For those firmware infrastructures that do not provide
 25  * a unique identifier for an interrupt controller, the irq_domain
 26  * code offers a fwnode allocator.
 27  */
 28 
 29 #ifndef _LINUX_IRQDOMAIN_H
 30 #define _LINUX_IRQDOMAIN_H
 31 
 32 #include <linux/types.h>
 33 #include <linux/irqhandler.h>
 34 #include <linux/of.h>
 35 #include <linux/radix-tree.h>
 36 
 37 struct device_node;
 38 struct irq_domain;
 39 struct of_device_id;
 40 struct irq_chip;
 41 struct irq_data;
 42 struct cpumask;
 43 
 44 /* Number of irqs reserved for a legacy isa controller */
 45 #define NUM_ISA_INTERRUPTS      16
 46 
 47 #define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16
 48 
 49 /**
 50  * struct irq_fwspec - generic IRQ specifier structure
 51  *
 52  * @fwnode:             Pointer to a firmware-specific descriptor
 53  * @param_count:        Number of device-specific parameters
 54  * @param:              Device-specific parameters
 55  *
 56  * This structure, directly modeled after of_phandle_args, is used to
 57  * pass a device-specific description of an interrupt.
 58  */
 59 struct irq_fwspec {
 60         struct fwnode_handle *fwnode;
 61         int param_count;
 62         u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
 63 };
 64 
 65 /*
 66  * Should several domains have the same device node, but serve
 67  * different purposes (for example one domain is for PCI/MSI, and the
 68  * other for wired IRQs), they can be distinguished using a
 69  * bus-specific token. Most domains are expected to only carry
 70  * DOMAIN_BUS_ANY.
 71  */
 72 enum irq_domain_bus_token {
 73         DOMAIN_BUS_ANY          = 0,
 74         DOMAIN_BUS_WIRED,
 75         DOMAIN_BUS_PCI_MSI,
 76         DOMAIN_BUS_PLATFORM_MSI,
 77         DOMAIN_BUS_NEXUS,
 78         DOMAIN_BUS_IPI,
 79         DOMAIN_BUS_FSL_MC_MSI,
 80 };
 81 
 82 /**
 83  * struct irq_domain_ops - Methods for irq_domain objects
 84  * @match: Match an interrupt controller device node to a host, returns
 85  *         1 on a match
 86  * @map: Create or update a mapping between a virtual irq number and a hw
 87  *       irq number. This is called only once for a given mapping.
 88  * @unmap: Dispose of such a mapping
 89  * @xlate: Given a device tree node and interrupt specifier, decode
 90  *         the hardware irq number and linux irq type value.
 91  *
 92  * Functions below are provided by the driver and called whenever a new mapping
 93  * is created or an old mapping is disposed. The driver can then proceed to
 94  * whatever internal data structures management is required. It also needs
 95  * to setup the irq_desc when returning from map().
 96  */
 97 struct irq_domain_ops {
 98         int (*match)(struct irq_domain *d, struct device_node *node,
 99                      enum irq_domain_bus_token bus_token);
100         int (*select)(struct irq_domain *d, struct irq_fwspec *fwspec,
101                       enum irq_domain_bus_token bus_token);
102         int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
103         void (*unmap)(struct irq_domain *d, unsigned int virq);
104         int (*xlate)(struct irq_domain *d, struct device_node *node,
105                      const u32 *intspec, unsigned int intsize,
106                      unsigned long *out_hwirq, unsigned int *out_type);
107 
108 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
109         /* extended V2 interfaces to support hierarchy irq_domains */
110         int (*alloc)(struct irq_domain *d, unsigned int virq,
111                      unsigned int nr_irqs, void *arg);
112         void (*free)(struct irq_domain *d, unsigned int virq,
113                      unsigned int nr_irqs);
114         void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
115         void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
116         int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
117                          unsigned long *out_hwirq, unsigned int *out_type);
118 #endif
119 };
120 
121 extern struct irq_domain_ops irq_generic_chip_ops;
122 
123 struct irq_domain_chip_generic;
124 
125 /**
126  * struct irq_domain - Hardware interrupt number translation object
127  * @link: Element in global irq_domain list.
128  * @name: Name of interrupt domain
129  * @ops: pointer to irq_domain methods
130  * @host_data: private data pointer for use by owner.  Not touched by irq_domain
131  *             core code.
132  * @flags: host per irq_domain flags
133  *
134  * Optional elements
135  * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
136  *           when decoding device tree interrupt specifiers.
137  * @gc: Pointer to a list of generic chips. There is a helper function for
138  *      setting up one or more generic chips for interrupt controllers
139  *      drivers using the generic chip library which uses this pointer.
140  * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
141  *
142  * Revmap data, used internally by irq_domain
143  * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
144  *                         support direct mapping
145  * @revmap_size: Size of the linear map table @linear_revmap[]
146  * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
147  * @linear_revmap: Linear table of hwirq->virq reverse mappings
148  */
149 struct irq_domain {
150         struct list_head link;
151         const char *name;
152         const struct irq_domain_ops *ops;
153         void *host_data;
154         unsigned int flags;
155 
156         /* Optional data */
157         struct fwnode_handle *fwnode;
158         enum irq_domain_bus_token bus_token;
159         struct irq_domain_chip_generic *gc;
160 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
161         struct irq_domain *parent;
162 #endif
163 
164         /* reverse map data. The linear map gets appended to the irq_domain */
165         irq_hw_number_t hwirq_max;
166         unsigned int revmap_direct_max_irq;
167         unsigned int revmap_size;
168         struct radix_tree_root revmap_tree;
169         unsigned int linear_revmap[];
170 };
171 
172 /* Irq domain flags */
173 enum {
174         /* Irq domain is hierarchical */
175         IRQ_DOMAIN_FLAG_HIERARCHY       = (1 << 0),
176 
177         /* Core calls alloc/free recursive through the domain hierarchy. */
178         IRQ_DOMAIN_FLAG_AUTO_RECURSIVE  = (1 << 1),
179 
180         /* Irq domain is an IPI domain with virq per cpu */
181         IRQ_DOMAIN_FLAG_IPI_PER_CPU     = (1 << 2),
182 
183         /* Irq domain is an IPI domain with single virq */
184         IRQ_DOMAIN_FLAG_IPI_SINGLE      = (1 << 3),
185 
186         /* Irq domain implements MSIs */
187         IRQ_DOMAIN_FLAG_MSI             = (1 << 4),
188 
189         /* Irq domain implements MSI remapping */
190         IRQ_DOMAIN_FLAG_MSI_REMAP       = (1 << 5),
191 
192         /*
193          * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
194          * for implementation specific purposes and ignored by the
195          * core code.
196          */
197         IRQ_DOMAIN_FLAG_NONCORE         = (1 << 16),
198 };
199 
200 static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
201 {
202         return to_of_node(d->fwnode);
203 }
204 
205 #ifdef CONFIG_IRQ_DOMAIN
206 struct fwnode_handle *irq_domain_alloc_fwnode(void *data);
207 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
208 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
209                                     irq_hw_number_t hwirq_max, int direct_max,
210                                     const struct irq_domain_ops *ops,
211                                     void *host_data);
212 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
213                                          unsigned int size,
214                                          unsigned int first_irq,
215                                          const struct irq_domain_ops *ops,
216                                          void *host_data);
217 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
218                                          unsigned int size,
219                                          unsigned int first_irq,
220                                          irq_hw_number_t first_hwirq,
221                                          const struct irq_domain_ops *ops,
222                                          void *host_data);
223 extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
224                                                    enum irq_domain_bus_token bus_token);
225 extern bool irq_domain_check_msi_remap(void);
226 extern void irq_set_default_host(struct irq_domain *host);
227 extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
228                                   irq_hw_number_t hwirq, int node,
229                                   const struct cpumask *affinity);
230 
231 static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node)
232 {
233         return node ? &node->fwnode : NULL;
234 }
235 
236 static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode)
237 {
238         return fwnode && fwnode->type == FWNODE_IRQCHIP;
239 }
240 
241 static inline
242 struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
243                                             enum irq_domain_bus_token bus_token)
244 {
245         struct irq_fwspec fwspec = {
246                 .fwnode = fwnode,
247         };
248 
249         return irq_find_matching_fwspec(&fwspec, bus_token);
250 }
251 
252 static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
253                                                         enum irq_domain_bus_token bus_token)
254 {
255         return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token);
256 }
257 
258 static inline struct irq_domain *irq_find_host(struct device_node *node)
259 {
260         return irq_find_matching_host(node, DOMAIN_BUS_ANY);
261 }
262 
263 /**
264  * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
265  * @of_node: pointer to interrupt controller's device tree node.
266  * @size: Number of interrupts in the domain.
267  * @ops: map/unmap domain callbacks
268  * @host_data: Controller private data pointer
269  */
270 static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
271                                          unsigned int size,
272                                          const struct irq_domain_ops *ops,
273                                          void *host_data)
274 {
275         return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
276 }
277 static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
278                                          unsigned int max_irq,
279                                          const struct irq_domain_ops *ops,
280                                          void *host_data)
281 {
282         return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data);
283 }
284 static inline struct irq_domain *irq_domain_add_legacy_isa(
285                                 struct device_node *of_node,
286                                 const struct irq_domain_ops *ops,
287                                 void *host_data)
288 {
289         return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
290                                      host_data);
291 }
292 static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
293                                          const struct irq_domain_ops *ops,
294                                          void *host_data)
295 {
296         return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data);
297 }
298 
299 static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode,
300                                          unsigned int size,
301                                          const struct irq_domain_ops *ops,
302                                          void *host_data)
303 {
304         return __irq_domain_add(fwnode, size, size, 0, ops, host_data);
305 }
306 
307 static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode,
308                                          const struct irq_domain_ops *ops,
309                                          void *host_data)
310 {
311         return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data);
312 }
313 
314 extern void irq_domain_remove(struct irq_domain *host);
315 
316 extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
317                                         irq_hw_number_t hwirq);
318 extern void irq_domain_associate_many(struct irq_domain *domain,
319                                       unsigned int irq_base,
320                                       irq_hw_number_t hwirq_base, int count);
321 extern void irq_domain_disassociate(struct irq_domain *domain,
322                                     unsigned int irq);
323 
324 extern unsigned int irq_create_mapping(struct irq_domain *host,
325                                        irq_hw_number_t hwirq);
326 extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
327 extern void irq_dispose_mapping(unsigned int virq);
328 
329 /**
330  * irq_linear_revmap() - Find a linux irq from a hw irq number.
331  * @domain: domain owning this hardware interrupt
332  * @hwirq: hardware irq number in that domain space
333  *
334  * This is a fast path alternative to irq_find_mapping() that can be
335  * called directly by irq controller code to save a handful of
336  * instructions. It is always safe to call, but won't find irqs mapped
337  * using the radix tree.
338  */
339 static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
340                                              irq_hw_number_t hwirq)
341 {
342         return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
343 }
344 extern unsigned int irq_find_mapping(struct irq_domain *host,
345                                      irq_hw_number_t hwirq);
346 extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
347 extern int irq_create_strict_mappings(struct irq_domain *domain,
348                                       unsigned int irq_base,
349                                       irq_hw_number_t hwirq_base, int count);
350 
351 static inline int irq_create_identity_mapping(struct irq_domain *host,
352                                               irq_hw_number_t hwirq)
353 {
354         return irq_create_strict_mappings(host, hwirq, hwirq, 1);
355 }
356 
357 extern const struct irq_domain_ops irq_domain_simple_ops;
358 
359 /* stock xlate functions */
360 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
361                         const u32 *intspec, unsigned int intsize,
362                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
363 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
364                         const u32 *intspec, unsigned int intsize,
365                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
366 int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
367                         const u32 *intspec, unsigned int intsize,
368                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
369 
370 /* IPI functions */
371 int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask *dest);
372 int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest);
373 
374 /* V2 interfaces to support hierarchy IRQ domains. */
375 extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
376                                                 unsigned int virq);
377 extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
378                                 irq_hw_number_t hwirq, struct irq_chip *chip,
379                                 void *chip_data, irq_flow_handler_t handler,
380                                 void *handler_data, const char *handler_name);
381 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
382 extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
383                         unsigned int flags, unsigned int size,
384                         struct fwnode_handle *fwnode,
385                         const struct irq_domain_ops *ops, void *host_data);
386 
387 static inline struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
388                                             unsigned int flags,
389                                             unsigned int size,
390                                             struct device_node *node,
391                                             const struct irq_domain_ops *ops,
392                                             void *host_data)
393 {
394         return irq_domain_create_hierarchy(parent, flags, size,
395                                            of_node_to_fwnode(node),
396                                            ops, host_data);
397 }
398 
399 extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
400                                    unsigned int nr_irqs, int node, void *arg,
401                                    bool realloc, const struct cpumask *affinity);
402 extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
403 extern void irq_domain_activate_irq(struct irq_data *irq_data);
404 extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
405 
406 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
407                         unsigned int nr_irqs, int node, void *arg)
408 {
409         return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false,
410                                        NULL);
411 }
412 
413 extern int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
414                                            unsigned int irq_base,
415                                            unsigned int nr_irqs, void *arg);
416 extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
417                                          unsigned int virq,
418                                          irq_hw_number_t hwirq,
419                                          struct irq_chip *chip,
420                                          void *chip_data);
421 extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
422 extern void irq_domain_free_irqs_common(struct irq_domain *domain,
423                                         unsigned int virq,
424                                         unsigned int nr_irqs);
425 extern void irq_domain_free_irqs_top(struct irq_domain *domain,
426                                      unsigned int virq, unsigned int nr_irqs);
427 
428 extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
429                                         unsigned int irq_base,
430                                         unsigned int nr_irqs, void *arg);
431 
432 extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
433                                         unsigned int irq_base,
434                                         unsigned int nr_irqs);
435 
436 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
437 {
438         return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
439 }
440 
441 static inline bool irq_domain_is_ipi(struct irq_domain *domain)
442 {
443         return domain->flags &
444                 (IRQ_DOMAIN_FLAG_IPI_PER_CPU | IRQ_DOMAIN_FLAG_IPI_SINGLE);
445 }
446 
447 static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
448 {
449         return domain->flags & IRQ_DOMAIN_FLAG_IPI_PER_CPU;
450 }
451 
452 static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
453 {
454         return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE;
455 }
456 
457 static inline bool irq_domain_is_msi(struct irq_domain *domain)
458 {
459         return domain->flags & IRQ_DOMAIN_FLAG_MSI;
460 }
461 
462 static inline bool irq_domain_is_msi_remap(struct irq_domain *domain)
463 {
464         return domain->flags & IRQ_DOMAIN_FLAG_MSI_REMAP;
465 }
466 
467 extern bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain);
468 
469 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
470 static inline void irq_domain_activate_irq(struct irq_data *data) { }
471 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
472 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
473                         unsigned int nr_irqs, int node, void *arg)
474 {
475         return -1;
476 }
477 
478 static inline void irq_domain_free_irqs(unsigned int virq,
479                                         unsigned int nr_irqs) { }
480 
481 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
482 {
483         return false;
484 }
485 
486 static inline bool irq_domain_is_ipi(struct irq_domain *domain)
487 {
488         return false;
489 }
490 
491 static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
492 {
493         return false;
494 }
495 
496 static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
497 {
498         return false;
499 }
500 
501 static inline bool irq_domain_is_msi(struct irq_domain *domain)
502 {
503         return false;
504 }
505 
506 static inline bool irq_domain_is_msi_remap(struct irq_domain *domain)
507 {
508         return false;
509 }
510 
511 static inline bool
512 irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
513 {
514         return false;
515 }
516 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
517 
518 #else /* CONFIG_IRQ_DOMAIN */
519 static inline void irq_dispose_mapping(unsigned int virq) { }
520 static inline void irq_domain_activate_irq(struct irq_data *data) { }
521 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
522 static inline struct irq_domain *irq_find_matching_fwnode(
523         struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token)
524 {
525         return NULL;
526 }
527 static inline bool irq_domain_check_msi_remap(void)
528 {
529         return false;
530 }
531 #endif /* !CONFIG_IRQ_DOMAIN */
532 
533 #endif /* _LINUX_IRQDOMAIN_H */
534 

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