1 /* SPDX-License-Identifier: GPL-2.0 */
3 * irq_domain - IRQ translation domains
5 * Translation infrastructure between hw and linux irq numbers. This is
6 * helpful for interrupt controllers to implement mapping between hardware
7 * irq numbers and the Linux irq number space.
9 * irq_domains also have hooks for translating device tree or other
10 * firmware interrupt representations into a hardware irq number that
11 * can be mapped back to a Linux irq number without any extra platform
14 * Interrupt controller "domain" data structure. This could be defined as a
15 * irq domain controller. That is, it handles the mapping between hardware
16 * and virtual interrupt numbers for a given interrupt domain. The domain
17 * structure is generally created by the PIC code for a given PIC instance
18 * (though a domain can cover more than one PIC if they have a flat number
19 * model). It's the domain callbacks that are responsible for setting the
20 * irq_chip on a given irq_desc after it's been mapped.
22 * The host code and data structures use a fwnode_handle pointer to
23 * identify the domain. In some cases, and in order to preserve source
24 * code compatibility, this fwnode pointer is "upgraded" to a DT
25 * device_node. For those firmware infrastructures that do not provide
26 * a unique identifier for an interrupt controller, the irq_domain
27 * code offers a fwnode allocator.
30 #ifndef _LINUX_IRQDOMAIN_H
31 #define _LINUX_IRQDOMAIN_H
33 #include <linux/types.h>
34 #include <linux/irqhandler.h>
36 #include <linux/mutex.h>
37 #include <linux/radix-tree.h>
46 struct irq_affinity_desc;
48 /* Number of irqs reserved for a legacy isa controller */
49 #define NUM_ISA_INTERRUPTS 16
51 #define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16
54 * struct irq_fwspec - generic IRQ specifier structure
56 * @fwnode: Pointer to a firmware-specific descriptor
57 * @param_count: Number of device-specific parameters
58 * @param: Device-specific parameters
60 * This structure, directly modeled after of_phandle_args, is used to
61 * pass a device-specific description of an interrupt.
64 struct fwnode_handle *fwnode;
66 u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
70 * Should several domains have the same device node, but serve
71 * different purposes (for example one domain is for PCI/MSI, and the
72 * other for wired IRQs), they can be distinguished using a
73 * bus-specific token. Most domains are expected to only carry
76 enum irq_domain_bus_token {
79 DOMAIN_BUS_GENERIC_MSI,
81 DOMAIN_BUS_PLATFORM_MSI,
84 DOMAIN_BUS_FSL_MC_MSI,
85 DOMAIN_BUS_TI_SCI_INTA_MSI,
91 * struct irq_domain_ops - Methods for irq_domain objects
92 * @match: Match an interrupt controller device node to a host, returns
94 * @map: Create or update a mapping between a virtual irq number and a hw
95 * irq number. This is called only once for a given mapping.
96 * @unmap: Dispose of such a mapping
97 * @xlate: Given a device tree node and interrupt specifier, decode
98 * the hardware irq number and linux irq type value.
100 * Functions below are provided by the driver and called whenever a new mapping
101 * is created or an old mapping is disposed. The driver can then proceed to
102 * whatever internal data structures management is required. It also needs
103 * to setup the irq_desc when returning from map().
105 struct irq_domain_ops {
106 int (*match)(struct irq_domain *d, struct device_node *node,
107 enum irq_domain_bus_token bus_token);
108 int (*select)(struct irq_domain *d, struct irq_fwspec *fwspec,
109 enum irq_domain_bus_token bus_token);
110 int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
111 void (*unmap)(struct irq_domain *d, unsigned int virq);
112 int (*xlate)(struct irq_domain *d, struct device_node *node,
113 const u32 *intspec, unsigned int intsize,
114 unsigned long *out_hwirq, unsigned int *out_type);
115 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
116 /* extended V2 interfaces to support hierarchy irq_domains */
117 int (*alloc)(struct irq_domain *d, unsigned int virq,
118 unsigned int nr_irqs, void *arg);
119 void (*free)(struct irq_domain *d, unsigned int virq,
120 unsigned int nr_irqs);
121 int (*activate)(struct irq_domain *d, struct irq_data *irqd, bool reserve);
122 void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
123 int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
124 unsigned long *out_hwirq, unsigned int *out_type);
126 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
127 void (*debug_show)(struct seq_file *m, struct irq_domain *d,
128 struct irq_data *irqd, int ind);
132 extern struct irq_domain_ops irq_generic_chip_ops;
134 struct irq_domain_chip_generic;
137 * struct irq_domain - Hardware interrupt number translation object
138 * @link: Element in global irq_domain list.
139 * @name: Name of interrupt domain
140 * @ops: pointer to irq_domain methods
141 * @host_data: private data pointer for use by owner. Not touched by irq_domain
143 * @flags: host per irq_domain flags
144 * @mapcount: The number of mapped interrupts
147 * @fwnode: Pointer to firmware node associated with the irq_domain. Pretty easy
148 * to swap it for the of_node via the irq_domain_get_of_node accessor
149 * @gc: Pointer to a list of generic chips. There is a helper function for
150 * setting up one or more generic chips for interrupt controllers
151 * drivers using the generic chip library which uses this pointer.
152 * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
153 * @debugfs_file: dentry for the domain debugfs file
155 * Revmap data, used internally by irq_domain
156 * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
157 * support direct mapping
158 * @revmap_size: Size of the linear map table @linear_revmap[]
159 * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
160 * @linear_revmap: Linear table of hwirq->virq reverse mappings
163 struct list_head link;
165 const struct irq_domain_ops *ops;
168 unsigned int mapcount;
171 struct fwnode_handle *fwnode;
172 enum irq_domain_bus_token bus_token;
173 struct irq_domain_chip_generic *gc;
174 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
175 struct irq_domain *parent;
177 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
178 struct dentry *debugfs_file;
181 /* reverse map data. The linear map gets appended to the irq_domain */
182 irq_hw_number_t hwirq_max;
183 unsigned int revmap_direct_max_irq;
184 unsigned int revmap_size;
185 struct radix_tree_root revmap_tree;
186 struct mutex revmap_tree_mutex;
187 unsigned int linear_revmap[];
190 /* Irq domain flags */
192 /* Irq domain is hierarchical */
193 IRQ_DOMAIN_FLAG_HIERARCHY = (1 << 0),
195 /* Irq domain name was allocated in __irq_domain_add() */
196 IRQ_DOMAIN_NAME_ALLOCATED = (1 << 1),
198 /* Irq domain is an IPI domain with virq per cpu */
199 IRQ_DOMAIN_FLAG_IPI_PER_CPU = (1 << 2),
201 /* Irq domain is an IPI domain with single virq */
202 IRQ_DOMAIN_FLAG_IPI_SINGLE = (1 << 3),
204 /* Irq domain implements MSIs */
205 IRQ_DOMAIN_FLAG_MSI = (1 << 4),
207 /* Irq domain implements MSI remapping */
208 IRQ_DOMAIN_FLAG_MSI_REMAP = (1 << 5),
211 * Quirk to handle MSI implementations which do not provide
212 * masking. Currently known to affect x86, but partially
213 * handled in core code.
215 IRQ_DOMAIN_MSI_NOMASK_QUIRK = (1 << 6),
218 * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
219 * for implementation specific purposes and ignored by the
222 IRQ_DOMAIN_FLAG_NONCORE = (1 << 16),
225 static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
227 return to_of_node(d->fwnode);
230 #ifdef CONFIG_IRQ_DOMAIN
231 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
232 const char *name, phys_addr_t *pa);
236 IRQCHIP_FWNODE_NAMED,
237 IRQCHIP_FWNODE_NAMED_ID,
241 struct fwnode_handle *irq_domain_alloc_named_fwnode(const char *name)
243 return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED, 0, name, NULL);
247 struct fwnode_handle *irq_domain_alloc_named_id_fwnode(const char *name, int id)
249 return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED_ID, id, name,
253 static inline struct fwnode_handle *irq_domain_alloc_fwnode(phys_addr_t *pa)
255 return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_REAL, 0, NULL, pa);
258 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
259 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
260 irq_hw_number_t hwirq_max, int direct_max,
261 const struct irq_domain_ops *ops,
263 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
265 unsigned int first_irq,
266 const struct irq_domain_ops *ops,
268 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
270 unsigned int first_irq,
271 irq_hw_number_t first_hwirq,
272 const struct irq_domain_ops *ops,
274 extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
275 enum irq_domain_bus_token bus_token);
276 extern bool irq_domain_check_msi_remap(void);
277 extern void irq_set_default_host(struct irq_domain *host);
278 extern struct irq_domain *irq_get_default_host(void);
279 extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
280 irq_hw_number_t hwirq, int node,
281 const struct irq_affinity_desc *affinity);
283 static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node)
285 return node ? &node->fwnode : NULL;
288 extern const struct fwnode_operations irqchip_fwnode_ops;
290 static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode)
292 return fwnode && fwnode->ops == &irqchip_fwnode_ops;
295 extern void irq_domain_update_bus_token(struct irq_domain *domain,
296 enum irq_domain_bus_token bus_token);
299 struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
300 enum irq_domain_bus_token bus_token)
302 struct irq_fwspec fwspec = {
306 return irq_find_matching_fwspec(&fwspec, bus_token);
309 static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
310 enum irq_domain_bus_token bus_token)
312 return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token);
315 static inline struct irq_domain *irq_find_host(struct device_node *node)
317 struct irq_domain *d;
319 d = irq_find_matching_host(node, DOMAIN_BUS_WIRED);
321 d = irq_find_matching_host(node, DOMAIN_BUS_ANY);
327 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
328 * @of_node: pointer to interrupt controller's device tree node.
329 * @size: Number of interrupts in the domain.
330 * @ops: map/unmap domain callbacks
331 * @host_data: Controller private data pointer
333 static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
335 const struct irq_domain_ops *ops,
338 return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
340 static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
341 unsigned int max_irq,
342 const struct irq_domain_ops *ops,
345 return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data);
347 static inline struct irq_domain *irq_domain_add_legacy_isa(
348 struct device_node *of_node,
349 const struct irq_domain_ops *ops,
352 return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
355 static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
356 const struct irq_domain_ops *ops,
359 return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data);
362 static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode,
364 const struct irq_domain_ops *ops,
367 return __irq_domain_add(fwnode, size, size, 0, ops, host_data);
370 static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode,
371 const struct irq_domain_ops *ops,
374 return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data);
377 extern void irq_domain_remove(struct irq_domain *host);
379 extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
380 irq_hw_number_t hwirq);
381 extern void irq_domain_associate_many(struct irq_domain *domain,
382 unsigned int irq_base,
383 irq_hw_number_t hwirq_base, int count);
384 extern void irq_domain_disassociate(struct irq_domain *domain,
387 extern unsigned int irq_create_mapping_affinity(struct irq_domain *host,
388 irq_hw_number_t hwirq,
389 const struct irq_affinity_desc *affinity);
390 extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
391 extern void irq_dispose_mapping(unsigned int virq);
393 static inline unsigned int irq_create_mapping(struct irq_domain *host,
394 irq_hw_number_t hwirq)
396 return irq_create_mapping_affinity(host, hwirq, NULL);
401 * irq_linear_revmap() - Find a linux irq from a hw irq number.
402 * @domain: domain owning this hardware interrupt
403 * @hwirq: hardware irq number in that domain space
405 * This is a fast path alternative to irq_find_mapping() that can be
406 * called directly by irq controller code to save a handful of
407 * instructions. It is always safe to call, but won't find irqs mapped
408 * using the radix tree.
410 static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
411 irq_hw_number_t hwirq)
413 return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
415 extern unsigned int irq_find_mapping(struct irq_domain *host,
416 irq_hw_number_t hwirq);
417 extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
418 extern int irq_create_strict_mappings(struct irq_domain *domain,
419 unsigned int irq_base,
420 irq_hw_number_t hwirq_base, int count);
422 static inline int irq_create_identity_mapping(struct irq_domain *host,
423 irq_hw_number_t hwirq)
425 return irq_create_strict_mappings(host, hwirq, hwirq, 1);
428 extern const struct irq_domain_ops irq_domain_simple_ops;
430 /* stock xlate functions */
431 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
432 const u32 *intspec, unsigned int intsize,
433 irq_hw_number_t *out_hwirq, unsigned int *out_type);
434 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
435 const u32 *intspec, unsigned int intsize,
436 irq_hw_number_t *out_hwirq, unsigned int *out_type);
437 int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
438 const u32 *intspec, unsigned int intsize,
439 irq_hw_number_t *out_hwirq, unsigned int *out_type);
441 int irq_domain_translate_twocell(struct irq_domain *d,
442 struct irq_fwspec *fwspec,
443 unsigned long *out_hwirq,
444 unsigned int *out_type);
446 int irq_domain_translate_onecell(struct irq_domain *d,
447 struct irq_fwspec *fwspec,
448 unsigned long *out_hwirq,
449 unsigned int *out_type);
452 int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask *dest);
453 int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest);
455 /* V2 interfaces to support hierarchy IRQ domains. */
456 extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
458 extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
459 irq_hw_number_t hwirq, struct irq_chip *chip,
460 void *chip_data, irq_flow_handler_t handler,
461 void *handler_data, const char *handler_name);
462 extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
463 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
464 extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
465 unsigned int flags, unsigned int size,
466 struct fwnode_handle *fwnode,
467 const struct irq_domain_ops *ops, void *host_data);
469 static inline struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
472 struct device_node *node,
473 const struct irq_domain_ops *ops,
476 return irq_domain_create_hierarchy(parent, flags, size,
477 of_node_to_fwnode(node),
481 extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
482 unsigned int nr_irqs, int node, void *arg,
484 const struct irq_affinity_desc *affinity);
485 extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
486 extern int irq_domain_activate_irq(struct irq_data *irq_data, bool early);
487 extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
489 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
490 unsigned int nr_irqs, int node, void *arg)
492 return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false,
496 extern int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
497 unsigned int irq_base,
498 unsigned int nr_irqs, void *arg);
499 extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
501 irq_hw_number_t hwirq,
502 struct irq_chip *chip,
504 extern void irq_domain_free_irqs_common(struct irq_domain *domain,
506 unsigned int nr_irqs);
507 extern void irq_domain_free_irqs_top(struct irq_domain *domain,
508 unsigned int virq, unsigned int nr_irqs);
510 extern int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg);
511 extern int irq_domain_pop_irq(struct irq_domain *domain, int virq);
513 extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
514 unsigned int irq_base,
515 unsigned int nr_irqs, void *arg);
517 extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
518 unsigned int irq_base,
519 unsigned int nr_irqs);
521 extern int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
524 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
526 return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
529 static inline bool irq_domain_is_ipi(struct irq_domain *domain)
531 return domain->flags &
532 (IRQ_DOMAIN_FLAG_IPI_PER_CPU | IRQ_DOMAIN_FLAG_IPI_SINGLE);
535 static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
537 return domain->flags & IRQ_DOMAIN_FLAG_IPI_PER_CPU;
540 static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
542 return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE;
545 static inline bool irq_domain_is_msi(struct irq_domain *domain)
547 return domain->flags & IRQ_DOMAIN_FLAG_MSI;
550 static inline bool irq_domain_is_msi_remap(struct irq_domain *domain)
552 return domain->flags & IRQ_DOMAIN_FLAG_MSI_REMAP;
555 extern bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain);
557 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
558 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
559 unsigned int nr_irqs, int node, void *arg)
564 static inline void irq_domain_free_irqs(unsigned int virq,
565 unsigned int nr_irqs) { }
567 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
572 static inline bool irq_domain_is_ipi(struct irq_domain *domain)
577 static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
582 static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
587 static inline bool irq_domain_is_msi(struct irq_domain *domain)
592 static inline bool irq_domain_is_msi_remap(struct irq_domain *domain)
598 irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
602 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
604 #else /* CONFIG_IRQ_DOMAIN */
605 static inline void irq_dispose_mapping(unsigned int virq) { }
606 static inline struct irq_domain *irq_find_matching_fwnode(
607 struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token)
611 static inline bool irq_domain_check_msi_remap(void)
615 #endif /* !CONFIG_IRQ_DOMAIN */
617 #endif /* _LINUX_IRQDOMAIN_H */