Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 : #ifndef LINUX_MSI_H
3 : #define LINUX_MSI_H
4 :
5 : /*
6 : * This header file contains MSI data structures and functions which are
7 : * only relevant for:
8 : * - Interrupt core code
9 : * - PCI/MSI core code
10 : * - MSI interrupt domain implementations
11 : * - IOMMU, low level VFIO, NTB and other justified exceptions
12 : * dealing with low level MSI details.
13 : *
14 : * Regular device drivers have no business with any of these functions and
15 : * especially storing MSI descriptor pointers in random code is considered
16 : * abuse.
17 : *
18 : * Device driver relevant functions are available in <linux/msi_api.h>
19 : */
20 :
21 : #include <linux/irqdomain_defs.h>
22 : #include <linux/cpumask.h>
23 : #include <linux/msi_api.h>
24 : #include <linux/xarray.h>
25 : #include <linux/mutex.h>
26 : #include <linux/list.h>
27 : #include <linux/irq.h>
28 : #include <linux/bits.h>
29 :
30 : #include <asm/msi.h>
31 :
32 : /* Dummy shadow structures if an architecture does not define them */
33 : #ifndef arch_msi_msg_addr_lo
34 : typedef struct arch_msi_msg_addr_lo {
35 : u32 address_lo;
36 : } __attribute__ ((packed)) arch_msi_msg_addr_lo_t;
37 : #endif
38 :
39 : #ifndef arch_msi_msg_addr_hi
40 : typedef struct arch_msi_msg_addr_hi {
41 : u32 address_hi;
42 : } __attribute__ ((packed)) arch_msi_msg_addr_hi_t;
43 : #endif
44 :
45 : #ifndef arch_msi_msg_data
46 : typedef struct arch_msi_msg_data {
47 : u32 data;
48 : } __attribute__ ((packed)) arch_msi_msg_data_t;
49 : #endif
50 :
51 : #ifndef arch_is_isolated_msi
52 : #define arch_is_isolated_msi() false
53 : #endif
54 :
55 : /**
56 : * msi_msg - Representation of a MSI message
57 : * @address_lo: Low 32 bits of msi message address
58 : * @arch_addrlo: Architecture specific shadow of @address_lo
59 : * @address_hi: High 32 bits of msi message address
60 : * (only used when device supports it)
61 : * @arch_addrhi: Architecture specific shadow of @address_hi
62 : * @data: MSI message data (usually 16 bits)
63 : * @arch_data: Architecture specific shadow of @data
64 : */
65 : struct msi_msg {
66 : union {
67 : u32 address_lo;
68 : arch_msi_msg_addr_lo_t arch_addr_lo;
69 : };
70 : union {
71 : u32 address_hi;
72 : arch_msi_msg_addr_hi_t arch_addr_hi;
73 : };
74 : union {
75 : u32 data;
76 : arch_msi_msg_data_t arch_data;
77 : };
78 : };
79 :
80 : extern int pci_msi_ignore_mask;
81 : /* Helper functions */
82 : struct msi_desc;
83 : struct pci_dev;
84 : struct platform_msi_priv_data;
85 : struct device_attribute;
86 : struct irq_domain;
87 : struct irq_affinity_desc;
88 :
89 : void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
90 : #ifdef CONFIG_GENERIC_MSI_IRQ
91 : void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
92 : #else
93 : static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg) { }
94 : #endif
95 :
96 : typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
97 : struct msi_msg *msg);
98 :
99 : /**
100 : * pci_msi_desc - PCI/MSI specific MSI descriptor data
101 : *
102 : * @msi_mask: [PCI MSI] MSI cached mask bits
103 : * @msix_ctrl: [PCI MSI-X] MSI-X cached per vector control bits
104 : * @is_msix: [PCI MSI/X] True if MSI-X
105 : * @multiple: [PCI MSI/X] log2 num of messages allocated
106 : * @multi_cap: [PCI MSI/X] log2 num of messages supported
107 : * @can_mask: [PCI MSI/X] Masking supported?
108 : * @is_64: [PCI MSI/X] Address size: 0=32bit 1=64bit
109 : * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
110 : * @mask_pos: [PCI MSI] Mask register position
111 : * @mask_base: [PCI MSI-X] Mask register base address
112 : */
113 : struct pci_msi_desc {
114 : union {
115 : u32 msi_mask;
116 : u32 msix_ctrl;
117 : };
118 : struct {
119 : u8 is_msix : 1;
120 : u8 multiple : 3;
121 : u8 multi_cap : 3;
122 : u8 can_mask : 1;
123 : u8 is_64 : 1;
124 : u8 is_virtual : 1;
125 : unsigned default_irq;
126 : } msi_attrib;
127 : union {
128 : u8 mask_pos;
129 : void __iomem *mask_base;
130 : };
131 : };
132 :
133 : /**
134 : * union msi_domain_cookie - Opaque MSI domain specific data
135 : * @value: u64 value store
136 : * @ptr: Pointer to domain specific data
137 : * @iobase: Domain specific IOmem pointer
138 : *
139 : * The content of this data is implementation defined and used by the MSI
140 : * domain to store domain specific information which is requried for
141 : * interrupt chip callbacks.
142 : */
143 : union msi_domain_cookie {
144 : u64 value;
145 : void *ptr;
146 : void __iomem *iobase;
147 : };
148 :
149 : /**
150 : * struct msi_desc_data - Generic MSI descriptor data
151 : * @dcookie: Cookie for MSI domain specific data which is required
152 : * for irq_chip callbacks
153 : * @icookie: Cookie for the MSI interrupt instance provided by
154 : * the usage site to the allocation function
155 : *
156 : * The content of this data is implementation defined, e.g. PCI/IMS
157 : * implementations define the meaning of the data. The MSI core ignores
158 : * this data completely.
159 : */
160 : struct msi_desc_data {
161 : union msi_domain_cookie dcookie;
162 : union msi_instance_cookie icookie;
163 : };
164 :
165 : #define MSI_MAX_INDEX ((unsigned int)USHRT_MAX)
166 :
167 : /**
168 : * struct msi_desc - Descriptor structure for MSI based interrupts
169 : * @irq: The base interrupt number
170 : * @nvec_used: The number of vectors used
171 : * @dev: Pointer to the device which uses this descriptor
172 : * @msg: The last set MSI message cached for reuse
173 : * @affinity: Optional pointer to a cpu affinity mask for this descriptor
174 : * @sysfs_attr: Pointer to sysfs device attribute
175 : *
176 : * @write_msi_msg: Callback that may be called when the MSI message
177 : * address or data changes
178 : * @write_msi_msg_data: Data parameter for the callback.
179 : *
180 : * @msi_index: Index of the msi descriptor
181 : * @pci: PCI specific msi descriptor data
182 : * @data: Generic MSI descriptor data
183 : */
184 : struct msi_desc {
185 : /* Shared device/bus type independent data */
186 : unsigned int irq;
187 : unsigned int nvec_used;
188 : struct device *dev;
189 : struct msi_msg msg;
190 : struct irq_affinity_desc *affinity;
191 : #ifdef CONFIG_IRQ_MSI_IOMMU
192 : const void *iommu_cookie;
193 : #endif
194 : #ifdef CONFIG_SYSFS
195 : struct device_attribute *sysfs_attrs;
196 : #endif
197 :
198 : void (*write_msi_msg)(struct msi_desc *entry, void *data);
199 : void *write_msi_msg_data;
200 :
201 : u16 msi_index;
202 : union {
203 : struct pci_msi_desc pci;
204 : struct msi_desc_data data;
205 : };
206 : };
207 :
208 : /*
209 : * Filter values for the MSI descriptor iterators and accessor functions.
210 : */
211 : enum msi_desc_filter {
212 : /* All descriptors */
213 : MSI_DESC_ALL,
214 : /* Descriptors which have no interrupt associated */
215 : MSI_DESC_NOTASSOCIATED,
216 : /* Descriptors which have an interrupt associated */
217 : MSI_DESC_ASSOCIATED,
218 : };
219 :
220 :
221 : /**
222 : * struct msi_dev_domain - The internals of MSI domain info per device
223 : * @store: Xarray for storing MSI descriptor pointers
224 : * @irqdomain: Pointer to a per device interrupt domain
225 : */
226 : struct msi_dev_domain {
227 : struct xarray store;
228 : struct irq_domain *domain;
229 : };
230 :
231 : /**
232 : * msi_device_data - MSI per device data
233 : * @properties: MSI properties which are interesting to drivers
234 : * @platform_data: Platform-MSI specific data
235 : * @mutex: Mutex protecting the MSI descriptor store
236 : * @__domains: Internal data for per device MSI domains
237 : * @__iter_idx: Index to search the next entry for iterators
238 : */
239 : struct msi_device_data {
240 : unsigned long properties;
241 : struct platform_msi_priv_data *platform_data;
242 : struct mutex mutex;
243 : struct msi_dev_domain __domains[MSI_MAX_DEVICE_IRQDOMAINS];
244 : unsigned long __iter_idx;
245 : };
246 :
247 : int msi_setup_device_data(struct device *dev);
248 :
249 : void msi_lock_descs(struct device *dev);
250 : void msi_unlock_descs(struct device *dev);
251 :
252 : struct msi_desc *msi_domain_first_desc(struct device *dev, unsigned int domid,
253 : enum msi_desc_filter filter);
254 :
255 : /**
256 : * msi_first_desc - Get the first MSI descriptor of the default irqdomain
257 : * @dev: Device to operate on
258 : * @filter: Descriptor state filter
259 : *
260 : * Must be called with the MSI descriptor mutex held, i.e. msi_lock_descs()
261 : * must be invoked before the call.
262 : *
263 : * Return: Pointer to the first MSI descriptor matching the search
264 : * criteria, NULL if none found.
265 : */
266 : static inline struct msi_desc *msi_first_desc(struct device *dev,
267 : enum msi_desc_filter filter)
268 : {
269 0 : return msi_domain_first_desc(dev, MSI_DEFAULT_DOMAIN, filter);
270 : }
271 :
272 : struct msi_desc *msi_next_desc(struct device *dev, unsigned int domid,
273 : enum msi_desc_filter filter);
274 :
275 : /**
276 : * msi_domain_for_each_desc - Iterate the MSI descriptors in a specific domain
277 : *
278 : * @desc: struct msi_desc pointer used as iterator
279 : * @dev: struct device pointer - device to iterate
280 : * @domid: The id of the interrupt domain which should be walked.
281 : * @filter: Filter for descriptor selection
282 : *
283 : * Notes:
284 : * - The loop must be protected with a msi_lock_descs()/msi_unlock_descs()
285 : * pair.
286 : * - It is safe to remove a retrieved MSI descriptor in the loop.
287 : */
288 : #define msi_domain_for_each_desc(desc, dev, domid, filter) \
289 : for ((desc) = msi_domain_first_desc((dev), (domid), (filter)); (desc); \
290 : (desc) = msi_next_desc((dev), (domid), (filter)))
291 :
292 : /**
293 : * msi_for_each_desc - Iterate the MSI descriptors in the default irqdomain
294 : *
295 : * @desc: struct msi_desc pointer used as iterator
296 : * @dev: struct device pointer - device to iterate
297 : * @filter: Filter for descriptor selection
298 : *
299 : * Notes:
300 : * - The loop must be protected with a msi_lock_descs()/msi_unlock_descs()
301 : * pair.
302 : * - It is safe to remove a retrieved MSI descriptor in the loop.
303 : */
304 : #define msi_for_each_desc(desc, dev, filter) \
305 : msi_domain_for_each_desc((desc), (dev), MSI_DEFAULT_DOMAIN, (filter))
306 :
307 : #define msi_desc_to_dev(desc) ((desc)->dev)
308 :
309 : #ifdef CONFIG_IRQ_MSI_IOMMU
310 : static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
311 : {
312 : return desc->iommu_cookie;
313 : }
314 :
315 : static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
316 : const void *iommu_cookie)
317 : {
318 : desc->iommu_cookie = iommu_cookie;
319 : }
320 : #else
321 : static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
322 : {
323 : return NULL;
324 : }
325 :
326 : static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
327 : const void *iommu_cookie)
328 : {
329 : }
330 : #endif
331 :
332 : int msi_domain_insert_msi_desc(struct device *dev, unsigned int domid,
333 : struct msi_desc *init_desc);
334 : /**
335 : * msi_insert_msi_desc - Allocate and initialize a MSI descriptor in the
336 : * default irqdomain and insert it at @init_desc->msi_index
337 : * @dev: Pointer to the device for which the descriptor is allocated
338 : * @init_desc: Pointer to an MSI descriptor to initialize the new descriptor
339 : *
340 : * Return: 0 on success or an appropriate failure code.
341 : */
342 : static inline int msi_insert_msi_desc(struct device *dev, struct msi_desc *init_desc)
343 : {
344 0 : return msi_domain_insert_msi_desc(dev, MSI_DEFAULT_DOMAIN, init_desc);
345 : }
346 :
347 : void msi_domain_free_msi_descs_range(struct device *dev, unsigned int domid,
348 : unsigned int first, unsigned int last);
349 :
350 : /**
351 : * msi_free_msi_descs_range - Free a range of MSI descriptors of a device
352 : * in the default irqdomain
353 : *
354 : * @dev: Device for which to free the descriptors
355 : * @first: Index to start freeing from (inclusive)
356 : * @last: Last index to be freed (inclusive)
357 : */
358 : static inline void msi_free_msi_descs_range(struct device *dev, unsigned int first,
359 : unsigned int last)
360 : {
361 0 : msi_domain_free_msi_descs_range(dev, MSI_DEFAULT_DOMAIN, first, last);
362 : }
363 :
364 : /**
365 : * msi_free_msi_descs - Free all MSI descriptors of a device in the default irqdomain
366 : * @dev: Device to free the descriptors
367 : */
368 : static inline void msi_free_msi_descs(struct device *dev)
369 : {
370 0 : msi_free_msi_descs_range(dev, 0, MSI_MAX_INDEX);
371 : }
372 :
373 : /*
374 : * The arch hooks to setup up msi irqs. Default functions are implemented
375 : * as weak symbols so that they /can/ be overriden by architecture specific
376 : * code if needed. These hooks can only be enabled by the architecture.
377 : *
378 : * If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by
379 : * stubs with warnings.
380 : */
381 : #ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
382 : int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
383 : void arch_teardown_msi_irq(unsigned int irq);
384 : int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
385 : void arch_teardown_msi_irqs(struct pci_dev *dev);
386 : #ifdef CONFIG_SYSFS
387 : int msi_device_populate_sysfs(struct device *dev);
388 : void msi_device_destroy_sysfs(struct device *dev);
389 : #else /* CONFIG_SYSFS */
390 : static inline int msi_device_populate_sysfs(struct device *dev) { return 0; }
391 : static inline void msi_device_destroy_sysfs(struct device *dev) { }
392 : #endif /* !CONFIG_SYSFS */
393 : #endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
394 :
395 : /*
396 : * The restore hook is still available even for fully irq domain based
397 : * setups. Courtesy to XEN/X86.
398 : */
399 : bool arch_restore_msi_irqs(struct pci_dev *dev);
400 :
401 : #ifdef CONFIG_GENERIC_MSI_IRQ
402 :
403 : #include <linux/irqhandler.h>
404 :
405 : struct irq_domain;
406 : struct irq_domain_ops;
407 : struct irq_chip;
408 : struct device_node;
409 : struct fwnode_handle;
410 : struct msi_domain_info;
411 :
412 : /**
413 : * struct msi_domain_ops - MSI interrupt domain callbacks
414 : * @get_hwirq: Retrieve the resulting hw irq number
415 : * @msi_init: Domain specific init function for MSI interrupts
416 : * @msi_free: Domain specific function to free a MSI interrupts
417 : * @msi_prepare: Prepare the allocation of the interrupts in the domain
418 : * @prepare_desc: Optional function to prepare the allocated MSI descriptor
419 : * in the domain
420 : * @set_desc: Set the msi descriptor for an interrupt
421 : * @domain_alloc_irqs: Optional function to override the default allocation
422 : * function.
423 : * @domain_free_irqs: Optional function to override the default free
424 : * function.
425 : * @msi_post_free: Optional function which is invoked after freeing
426 : * all interrupts.
427 : *
428 : * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying
429 : * irqdomain.
430 : *
431 : * @msi_check, @msi_prepare, @prepare_desc and @set_desc are callbacks used by the
432 : * msi_domain_alloc/free_irqs*() variants.
433 : *
434 : * @domain_alloc_irqs, @domain_free_irqs can be used to override the
435 : * default allocation/free functions (__msi_domain_alloc/free_irqs). This
436 : * is initially for a wrapper around XENs seperate MSI universe which can't
437 : * be wrapped into the regular irq domains concepts by mere mortals. This
438 : * allows to universally use msi_domain_alloc/free_irqs without having to
439 : * special case XEN all over the place.
440 : */
441 : struct msi_domain_ops {
442 : irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info,
443 : msi_alloc_info_t *arg);
444 : int (*msi_init)(struct irq_domain *domain,
445 : struct msi_domain_info *info,
446 : unsigned int virq, irq_hw_number_t hwirq,
447 : msi_alloc_info_t *arg);
448 : void (*msi_free)(struct irq_domain *domain,
449 : struct msi_domain_info *info,
450 : unsigned int virq);
451 : int (*msi_prepare)(struct irq_domain *domain,
452 : struct device *dev, int nvec,
453 : msi_alloc_info_t *arg);
454 : void (*prepare_desc)(struct irq_domain *domain, msi_alloc_info_t *arg,
455 : struct msi_desc *desc);
456 : void (*set_desc)(msi_alloc_info_t *arg,
457 : struct msi_desc *desc);
458 : int (*domain_alloc_irqs)(struct irq_domain *domain,
459 : struct device *dev, int nvec);
460 : void (*domain_free_irqs)(struct irq_domain *domain,
461 : struct device *dev);
462 : void (*msi_post_free)(struct irq_domain *domain,
463 : struct device *dev);
464 : };
465 :
466 : /**
467 : * struct msi_domain_info - MSI interrupt domain data
468 : * @flags: Flags to decribe features and capabilities
469 : * @bus_token: The domain bus token
470 : * @hwsize: The hardware table size or the software index limit.
471 : * If 0 then the size is considered unlimited and
472 : * gets initialized to the maximum software index limit
473 : * by the domain creation code.
474 : * @ops: The callback data structure
475 : * @chip: Optional: associated interrupt chip
476 : * @chip_data: Optional: associated interrupt chip data
477 : * @handler: Optional: associated interrupt flow handler
478 : * @handler_data: Optional: associated interrupt flow handler data
479 : * @handler_name: Optional: associated interrupt flow handler name
480 : * @data: Optional: domain specific data
481 : */
482 : struct msi_domain_info {
483 : u32 flags;
484 : enum irq_domain_bus_token bus_token;
485 : unsigned int hwsize;
486 : struct msi_domain_ops *ops;
487 : struct irq_chip *chip;
488 : void *chip_data;
489 : irq_flow_handler_t handler;
490 : void *handler_data;
491 : const char *handler_name;
492 : void *data;
493 : };
494 :
495 : /**
496 : * struct msi_domain_template - Template for MSI device domains
497 : * @name: Storage for the resulting name. Filled in by the core.
498 : * @chip: Interrupt chip for this domain
499 : * @ops: MSI domain ops
500 : * @info: MSI domain info data
501 : */
502 : struct msi_domain_template {
503 : char name[48];
504 : struct irq_chip chip;
505 : struct msi_domain_ops ops;
506 : struct msi_domain_info info;
507 : };
508 :
509 : /*
510 : * Flags for msi_domain_info
511 : *
512 : * Bit 0-15: Generic MSI functionality which is not subject to restriction
513 : * by parent domains
514 : *
515 : * Bit 16-31: Functionality which depends on the underlying parent domain and
516 : * can be masked out by msi_parent_ops::init_dev_msi_info() when
517 : * a device MSI domain is initialized.
518 : */
519 : enum {
520 : /*
521 : * Init non implemented ops callbacks with default MSI domain
522 : * callbacks.
523 : */
524 : MSI_FLAG_USE_DEF_DOM_OPS = (1 << 0),
525 : /*
526 : * Init non implemented chip callbacks with default MSI chip
527 : * callbacks.
528 : */
529 : MSI_FLAG_USE_DEF_CHIP_OPS = (1 << 1),
530 : /* Needs early activate, required for PCI */
531 : MSI_FLAG_ACTIVATE_EARLY = (1 << 2),
532 : /*
533 : * Must reactivate when irq is started even when
534 : * MSI_FLAG_ACTIVATE_EARLY has been set.
535 : */
536 : MSI_FLAG_MUST_REACTIVATE = (1 << 3),
537 : /* Populate sysfs on alloc() and destroy it on free() */
538 : MSI_FLAG_DEV_SYSFS = (1 << 4),
539 : /* Allocate simple MSI descriptors */
540 : MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS = (1 << 5),
541 : /* Free MSI descriptors */
542 : MSI_FLAG_FREE_MSI_DESCS = (1 << 6),
543 : /*
544 : * Quirk to handle MSI implementations which do not provide
545 : * masking. Currently known to affect x86, but has to be partially
546 : * handled in the core MSI code.
547 : */
548 : MSI_FLAG_NOMASK_QUIRK = (1 << 7),
549 :
550 : /* Mask for the generic functionality */
551 : MSI_GENERIC_FLAGS_MASK = GENMASK(15, 0),
552 :
553 : /* Mask for the domain specific functionality */
554 : MSI_DOMAIN_FLAGS_MASK = GENMASK(31, 16),
555 :
556 : /* Support multiple PCI MSI interrupts */
557 : MSI_FLAG_MULTI_PCI_MSI = (1 << 16),
558 : /* Support PCI MSIX interrupts */
559 : MSI_FLAG_PCI_MSIX = (1 << 17),
560 : /* Is level-triggered capable, using two messages */
561 : MSI_FLAG_LEVEL_CAPABLE = (1 << 18),
562 : /* MSI-X entries must be contiguous */
563 : MSI_FLAG_MSIX_CONTIGUOUS = (1 << 19),
564 : /* PCI/MSI-X vectors can be dynamically allocated/freed post MSI-X enable */
565 : MSI_FLAG_PCI_MSIX_ALLOC_DYN = (1 << 20),
566 : /* Support for PCI/IMS */
567 : MSI_FLAG_PCI_IMS = (1 << 21),
568 : };
569 :
570 : /**
571 : * struct msi_parent_ops - MSI parent domain callbacks and configuration info
572 : *
573 : * @supported_flags: Required: The supported MSI flags of the parent domain
574 : * @prefix: Optional: Prefix for the domain and chip name
575 : * @init_dev_msi_info: Required: Callback for MSI parent domains to setup parent
576 : * domain specific domain flags, domain ops and interrupt chip
577 : * callbacks when a per device domain is created.
578 : */
579 : struct msi_parent_ops {
580 : u32 supported_flags;
581 : const char *prefix;
582 : bool (*init_dev_msi_info)(struct device *dev, struct irq_domain *domain,
583 : struct irq_domain *msi_parent_domain,
584 : struct msi_domain_info *msi_child_info);
585 : };
586 :
587 : bool msi_parent_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
588 : struct irq_domain *msi_parent_domain,
589 : struct msi_domain_info *msi_child_info);
590 :
591 : int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
592 : bool force);
593 :
594 : struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
595 : struct msi_domain_info *info,
596 : struct irq_domain *parent);
597 :
598 : bool msi_create_device_irq_domain(struct device *dev, unsigned int domid,
599 : const struct msi_domain_template *template,
600 : unsigned int hwsize, void *domain_data,
601 : void *chip_data);
602 : void msi_remove_device_irq_domain(struct device *dev, unsigned int domid);
603 :
604 : bool msi_match_device_irq_domain(struct device *dev, unsigned int domid,
605 : enum irq_domain_bus_token bus_token);
606 :
607 : int msi_domain_alloc_irqs_range_locked(struct device *dev, unsigned int domid,
608 : unsigned int first, unsigned int last);
609 : int msi_domain_alloc_irqs_range(struct device *dev, unsigned int domid,
610 : unsigned int first, unsigned int last);
611 : int msi_domain_alloc_irqs_all_locked(struct device *dev, unsigned int domid, int nirqs);
612 :
613 : struct msi_map msi_domain_alloc_irq_at(struct device *dev, unsigned int domid, unsigned int index,
614 : const struct irq_affinity_desc *affdesc,
615 : union msi_instance_cookie *cookie);
616 :
617 : void msi_domain_free_irqs_range_locked(struct device *dev, unsigned int domid,
618 : unsigned int first, unsigned int last);
619 : void msi_domain_free_irqs_range(struct device *dev, unsigned int domid,
620 : unsigned int first, unsigned int last);
621 : void msi_domain_free_irqs_all_locked(struct device *dev, unsigned int domid);
622 : void msi_domain_free_irqs_all(struct device *dev, unsigned int domid);
623 :
624 : struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
625 :
626 : struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
627 : struct msi_domain_info *info,
628 : struct irq_domain *parent);
629 : int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
630 : irq_write_msi_msg_t write_msi_msg);
631 : void platform_msi_domain_free_irqs(struct device *dev);
632 :
633 : /* When an MSI domain is used as an intermediate domain */
634 : int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
635 : int nvec, msi_alloc_info_t *args);
636 : int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
637 : int virq, int nvec, msi_alloc_info_t *args);
638 : void msi_domain_depopulate_descs(struct device *dev, int virq, int nvec);
639 :
640 : struct irq_domain *
641 : __platform_msi_create_device_domain(struct device *dev,
642 : unsigned int nvec,
643 : bool is_tree,
644 : irq_write_msi_msg_t write_msi_msg,
645 : const struct irq_domain_ops *ops,
646 : void *host_data);
647 :
648 : #define platform_msi_create_device_domain(dev, nvec, write, ops, data) \
649 : __platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
650 : #define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
651 : __platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
652 :
653 : int platform_msi_device_domain_alloc(struct irq_domain *domain, unsigned int virq,
654 : unsigned int nr_irqs);
655 : void platform_msi_device_domain_free(struct irq_domain *domain, unsigned int virq,
656 : unsigned int nvec);
657 : void *platform_msi_get_host_data(struct irq_domain *domain);
658 :
659 : bool msi_device_has_isolated_msi(struct device *dev);
660 : #else /* CONFIG_GENERIC_MSI_IRQ */
661 : static inline bool msi_device_has_isolated_msi(struct device *dev)
662 : {
663 : /*
664 : * Arguably if the platform does not enable MSI support then it has
665 : * "isolated MSI", as an interrupt controller that cannot receive MSIs
666 : * is inherently isolated by our definition. The default definition for
667 : * arch_is_isolated_msi() is conservative and returns false anyhow.
668 : */
669 : return arch_is_isolated_msi();
670 : }
671 : #endif /* CONFIG_GENERIC_MSI_IRQ */
672 :
673 : /* PCI specific interfaces */
674 : #ifdef CONFIG_PCI_MSI
675 : struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
676 : void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
677 : void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
678 : void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
679 : void pci_msi_mask_irq(struct irq_data *data);
680 : void pci_msi_unmask_irq(struct irq_data *data);
681 : struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
682 : struct msi_domain_info *info,
683 : struct irq_domain *parent);
684 : u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
685 : struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
686 : #else /* CONFIG_PCI_MSI */
687 : static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
688 : {
689 : return NULL;
690 : }
691 : static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg) { }
692 : #endif /* !CONFIG_PCI_MSI */
693 :
694 : #endif /* LINUX_MSI_H */
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