1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/kobject.h>
6 #include <linux/list.h>
9 /* Dummy shadow structures if an architecture does not define them */
10 #ifndef arch_msi_msg_addr_lo
11 typedef struct arch_msi_msg_addr_lo
{
13 } __attribute__ ((packed
)) arch_msi_msg_addr_lo_t
;
16 #ifndef arch_msi_msg_addr_hi
17 typedef struct arch_msi_msg_addr_hi
{
19 } __attribute__ ((packed
)) arch_msi_msg_addr_hi_t
;
22 #ifndef arch_msi_msg_data
23 typedef struct arch_msi_msg_data
{
25 } __attribute__ ((packed
)) arch_msi_msg_data_t
;
29 * msi_msg - Representation of a MSI message
30 * @address_lo: Low 32 bits of msi message address
31 * @arch_addrlo: Architecture specific shadow of @address_lo
32 * @address_hi: High 32 bits of msi message address
33 * (only used when device supports it)
34 * @arch_addrhi: Architecture specific shadow of @address_hi
35 * @data: MSI message data (usually 16 bits)
36 * @arch_data: Architecture specific shadow of @data
41 arch_msi_msg_addr_lo_t arch_addr_lo
;
45 arch_msi_msg_addr_hi_t arch_addr_hi
;
49 arch_msi_msg_data_t arch_data
;
53 extern int pci_msi_ignore_mask
;
54 /* Helper functions */
58 struct platform_msi_priv_data
;
59 void __get_cached_msi_msg(struct msi_desc
*entry
, struct msi_msg
*msg
);
60 #ifdef CONFIG_GENERIC_MSI_IRQ
61 void get_cached_msi_msg(unsigned int irq
, struct msi_msg
*msg
);
63 static inline void get_cached_msi_msg(unsigned int irq
, struct msi_msg
*msg
)
68 typedef void (*irq_write_msi_msg_t
)(struct msi_desc
*desc
,
72 * platform_msi_desc - Platform device specific msi descriptor data
73 * @msi_priv_data: Pointer to platform private data
74 * @msi_index: The index of the MSI descriptor for multi MSI
76 struct platform_msi_desc
{
77 struct platform_msi_priv_data
*msi_priv_data
;
82 * fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
83 * @msi_index: The index of the MSI descriptor
85 struct fsl_mc_msi_desc
{
90 * ti_sci_inta_msi_desc - TISCI based INTA specific msi descriptor data
91 * @dev_index: TISCI device index
93 struct ti_sci_inta_msi_desc
{
98 * struct msi_desc - Descriptor structure for MSI based interrupts
99 * @list: List head for management
100 * @irq: The base interrupt number
101 * @nvec_used: The number of vectors used
102 * @dev: Pointer to the device which uses this descriptor
103 * @msg: The last set MSI message cached for reuse
104 * @affinity: Optional pointer to a cpu affinity mask for this descriptor
106 * @write_msi_msg: Callback that may be called when the MSI message
107 * address or data changes
108 * @write_msi_msg_data: Data parameter for the callback.
110 * @msi_mask: [PCI MSI] MSI cached mask bits
111 * @msix_ctrl: [PCI MSI-X] MSI-X cached per vector control bits
112 * @is_msix: [PCI MSI/X] True if MSI-X
113 * @multiple: [PCI MSI/X] log2 num of messages allocated
114 * @multi_cap: [PCI MSI/X] log2 num of messages supported
115 * @maskbit: [PCI MSI/X] Mask-Pending bit supported?
116 * @is_64: [PCI MSI/X] Address size: 0=32bit 1=64bit
117 * @entry_nr: [PCI MSI/X] Entry which is described by this descriptor
118 * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
119 * @mask_pos: [PCI MSI] Mask register position
120 * @mask_base: [PCI MSI-X] Mask register base address
121 * @platform: [platform] Platform device specific msi descriptor data
122 * @fsl_mc: [fsl-mc] FSL MC device specific msi descriptor data
123 * @inta: [INTA] TISCI based INTA specific msi descriptor data
126 /* Shared device/bus type independent data */
127 struct list_head list
;
129 unsigned int nvec_used
;
132 struct irq_affinity_desc
*affinity
;
133 #ifdef CONFIG_IRQ_MSI_IOMMU
134 const void *iommu_cookie
;
137 void (*write_msi_msg
)(struct msi_desc
*entry
, void *data
);
138 void *write_msi_msg_data
;
141 /* PCI MSI/X specific data */
155 unsigned default_irq
;
159 void __iomem
*mask_base
;
164 * Non PCI variants add their data structure here. New
165 * entries need to use a named structure. We want
166 * proper name spaces for this. The PCI part is
167 * anonymous for now as it would require an immediate
170 struct platform_msi_desc platform
;
171 struct fsl_mc_msi_desc fsl_mc
;
172 struct ti_sci_inta_msi_desc inta
;
176 /* Helpers to hide struct msi_desc implementation details */
177 #define msi_desc_to_dev(desc) ((desc)->dev)
178 #define dev_to_msi_list(dev) (&(dev)->msi_list)
179 #define first_msi_entry(dev) \
180 list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
181 #define for_each_msi_entry(desc, dev) \
182 list_for_each_entry((desc), dev_to_msi_list((dev)), list)
183 #define for_each_msi_entry_safe(desc, tmp, dev) \
184 list_for_each_entry_safe((desc), (tmp), dev_to_msi_list((dev)), list)
185 #define for_each_msi_vector(desc, __irq, dev) \
186 for_each_msi_entry((desc), (dev)) \
188 for (__irq = (desc)->irq; \
189 __irq < ((desc)->irq + (desc)->nvec_used); \
192 #ifdef CONFIG_IRQ_MSI_IOMMU
193 static inline const void *msi_desc_get_iommu_cookie(struct msi_desc
*desc
)
195 return desc
->iommu_cookie
;
198 static inline void msi_desc_set_iommu_cookie(struct msi_desc
*desc
,
199 const void *iommu_cookie
)
201 desc
->iommu_cookie
= iommu_cookie
;
204 static inline const void *msi_desc_get_iommu_cookie(struct msi_desc
*desc
)
209 static inline void msi_desc_set_iommu_cookie(struct msi_desc
*desc
,
210 const void *iommu_cookie
)
215 #ifdef CONFIG_PCI_MSI
216 #define first_pci_msi_entry(pdev) first_msi_entry(&(pdev)->dev)
217 #define for_each_pci_msi_entry(desc, pdev) \
218 for_each_msi_entry((desc), &(pdev)->dev)
220 struct pci_dev
*msi_desc_to_pci_dev(struct msi_desc
*desc
);
221 void *msi_desc_to_pci_sysdata(struct msi_desc
*desc
);
222 void pci_write_msi_msg(unsigned int irq
, struct msi_msg
*msg
);
223 #else /* CONFIG_PCI_MSI */
224 static inline void *msi_desc_to_pci_sysdata(struct msi_desc
*desc
)
228 static inline void pci_write_msi_msg(unsigned int irq
, struct msi_msg
*msg
)
231 #endif /* CONFIG_PCI_MSI */
233 struct msi_desc
*alloc_msi_entry(struct device
*dev
, int nvec
,
234 const struct irq_affinity_desc
*affinity
);
235 void free_msi_entry(struct msi_desc
*entry
);
236 void __pci_read_msi_msg(struct msi_desc
*entry
, struct msi_msg
*msg
);
237 void __pci_write_msi_msg(struct msi_desc
*entry
, struct msi_msg
*msg
);
239 void pci_msi_mask_irq(struct irq_data
*data
);
240 void pci_msi_unmask_irq(struct irq_data
*data
);
242 const struct attribute_group
**msi_populate_sysfs(struct device
*dev
);
243 void msi_destroy_sysfs(struct device
*dev
,
244 const struct attribute_group
**msi_irq_groups
);
247 * The arch hooks to setup up msi irqs. Default functions are implemented
248 * as weak symbols so that they /can/ be overriden by architecture specific
249 * code if needed. These hooks can only be enabled by the architecture.
251 * If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by
252 * stubs with warnings.
254 #ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
255 int arch_setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*desc
);
256 void arch_teardown_msi_irq(unsigned int irq
);
257 int arch_setup_msi_irqs(struct pci_dev
*dev
, int nvec
, int type
);
258 void arch_teardown_msi_irqs(struct pci_dev
*dev
);
260 static inline int arch_setup_msi_irqs(struct pci_dev
*dev
, int nvec
, int type
)
266 static inline void arch_teardown_msi_irqs(struct pci_dev
*dev
)
273 * The restore hooks are still available as they are useful even
274 * for fully irq domain based setups. Courtesy to XEN/X86.
276 void arch_restore_msi_irqs(struct pci_dev
*dev
);
277 void default_restore_msi_irqs(struct pci_dev
*dev
);
279 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
281 #include <linux/irqhandler.h>
284 struct irq_domain_ops
;
287 struct fwnode_handle
;
288 struct msi_domain_info
;
291 * struct msi_domain_ops - MSI interrupt domain callbacks
292 * @get_hwirq: Retrieve the resulting hw irq number
293 * @msi_init: Domain specific init function for MSI interrupts
294 * @msi_free: Domain specific function to free a MSI interrupts
295 * @msi_check: Callback for verification of the domain/info/dev data
296 * @msi_prepare: Prepare the allocation of the interrupts in the domain
297 * @msi_finish: Optional callback to finalize the allocation
298 * @set_desc: Set the msi descriptor for an interrupt
299 * @handle_error: Optional error handler if the allocation fails
300 * @domain_alloc_irqs: Optional function to override the default allocation
302 * @domain_free_irqs: Optional function to override the default free
305 * @get_hwirq, @msi_init and @msi_free are callbacks used by
306 * msi_create_irq_domain() and related interfaces
308 * @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error
309 * are callbacks used by msi_domain_alloc_irqs() and related
310 * interfaces which are based on msi_desc.
312 * @domain_alloc_irqs, @domain_free_irqs can be used to override the
313 * default allocation/free functions (__msi_domain_alloc/free_irqs). This
314 * is initially for a wrapper around XENs seperate MSI universe which can't
315 * be wrapped into the regular irq domains concepts by mere mortals. This
316 * allows to universally use msi_domain_alloc/free_irqs without having to
317 * special case XEN all over the place.
319 * Contrary to other operations @domain_alloc_irqs and @domain_free_irqs
320 * are set to the default implementation if NULL and even when
321 * MSI_FLAG_USE_DEF_DOM_OPS is not set to avoid breaking existing users and
322 * because these callbacks are obviously mandatory.
324 * This is NOT meant to be abused, but it can be useful to build wrappers
325 * for specialized MSI irq domains which need extra work before and after
326 * calling __msi_domain_alloc_irqs()/__msi_domain_free_irqs().
328 struct msi_domain_ops
{
329 irq_hw_number_t (*get_hwirq
)(struct msi_domain_info
*info
,
330 msi_alloc_info_t
*arg
);
331 int (*msi_init
)(struct irq_domain
*domain
,
332 struct msi_domain_info
*info
,
333 unsigned int virq
, irq_hw_number_t hwirq
,
334 msi_alloc_info_t
*arg
);
335 void (*msi_free
)(struct irq_domain
*domain
,
336 struct msi_domain_info
*info
,
338 int (*msi_check
)(struct irq_domain
*domain
,
339 struct msi_domain_info
*info
,
341 int (*msi_prepare
)(struct irq_domain
*domain
,
342 struct device
*dev
, int nvec
,
343 msi_alloc_info_t
*arg
);
344 void (*msi_finish
)(msi_alloc_info_t
*arg
, int retval
);
345 void (*set_desc
)(msi_alloc_info_t
*arg
,
346 struct msi_desc
*desc
);
347 int (*handle_error
)(struct irq_domain
*domain
,
348 struct msi_desc
*desc
, int error
);
349 int (*domain_alloc_irqs
)(struct irq_domain
*domain
,
350 struct device
*dev
, int nvec
);
351 void (*domain_free_irqs
)(struct irq_domain
*domain
,
356 * struct msi_domain_info - MSI interrupt domain data
357 * @flags: Flags to decribe features and capabilities
358 * @ops: The callback data structure
359 * @chip: Optional: associated interrupt chip
360 * @chip_data: Optional: associated interrupt chip data
361 * @handler: Optional: associated interrupt flow handler
362 * @handler_data: Optional: associated interrupt flow handler data
363 * @handler_name: Optional: associated interrupt flow handler name
364 * @data: Optional: domain specific data
366 struct msi_domain_info
{
368 struct msi_domain_ops
*ops
;
369 struct irq_chip
*chip
;
371 irq_flow_handler_t handler
;
373 const char *handler_name
;
377 /* Flags for msi_domain_info */
380 * Init non implemented ops callbacks with default MSI domain
383 MSI_FLAG_USE_DEF_DOM_OPS
= (1 << 0),
385 * Init non implemented chip callbacks with default MSI chip
388 MSI_FLAG_USE_DEF_CHIP_OPS
= (1 << 1),
389 /* Support multiple PCI MSI interrupts */
390 MSI_FLAG_MULTI_PCI_MSI
= (1 << 2),
391 /* Support PCI MSIX interrupts */
392 MSI_FLAG_PCI_MSIX
= (1 << 3),
393 /* Needs early activate, required for PCI */
394 MSI_FLAG_ACTIVATE_EARLY
= (1 << 4),
396 * Must reactivate when irq is started even when
397 * MSI_FLAG_ACTIVATE_EARLY has been set.
399 MSI_FLAG_MUST_REACTIVATE
= (1 << 5),
400 /* Is level-triggered capable, using two messages */
401 MSI_FLAG_LEVEL_CAPABLE
= (1 << 6),
404 int msi_domain_set_affinity(struct irq_data
*data
, const struct cpumask
*mask
,
407 struct irq_domain
*msi_create_irq_domain(struct fwnode_handle
*fwnode
,
408 struct msi_domain_info
*info
,
409 struct irq_domain
*parent
);
410 int __msi_domain_alloc_irqs(struct irq_domain
*domain
, struct device
*dev
,
412 int msi_domain_alloc_irqs(struct irq_domain
*domain
, struct device
*dev
,
414 void __msi_domain_free_irqs(struct irq_domain
*domain
, struct device
*dev
);
415 void msi_domain_free_irqs(struct irq_domain
*domain
, struct device
*dev
);
416 struct msi_domain_info
*msi_get_domain_info(struct irq_domain
*domain
);
418 struct irq_domain
*platform_msi_create_irq_domain(struct fwnode_handle
*fwnode
,
419 struct msi_domain_info
*info
,
420 struct irq_domain
*parent
);
421 int platform_msi_domain_alloc_irqs(struct device
*dev
, unsigned int nvec
,
422 irq_write_msi_msg_t write_msi_msg
);
423 void platform_msi_domain_free_irqs(struct device
*dev
);
425 /* When an MSI domain is used as an intermediate domain */
426 int msi_domain_prepare_irqs(struct irq_domain
*domain
, struct device
*dev
,
427 int nvec
, msi_alloc_info_t
*args
);
428 int msi_domain_populate_irqs(struct irq_domain
*domain
, struct device
*dev
,
429 int virq
, int nvec
, msi_alloc_info_t
*args
);
431 __platform_msi_create_device_domain(struct device
*dev
,
434 irq_write_msi_msg_t write_msi_msg
,
435 const struct irq_domain_ops
*ops
,
438 #define platform_msi_create_device_domain(dev, nvec, write, ops, data) \
439 __platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
440 #define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
441 __platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
443 int platform_msi_domain_alloc(struct irq_domain
*domain
, unsigned int virq
,
444 unsigned int nr_irqs
);
445 void platform_msi_domain_free(struct irq_domain
*domain
, unsigned int virq
,
447 void *platform_msi_get_host_data(struct irq_domain
*domain
);
448 #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
450 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
451 void pci_msi_domain_write_msg(struct irq_data
*irq_data
, struct msi_msg
*msg
);
452 struct irq_domain
*pci_msi_create_irq_domain(struct fwnode_handle
*fwnode
,
453 struct msi_domain_info
*info
,
454 struct irq_domain
*parent
);
455 int pci_msi_domain_check_cap(struct irq_domain
*domain
,
456 struct msi_domain_info
*info
, struct device
*dev
);
457 u32
pci_msi_domain_get_msi_rid(struct irq_domain
*domain
, struct pci_dev
*pdev
);
458 struct irq_domain
*pci_msi_get_device_domain(struct pci_dev
*pdev
);
459 bool pci_dev_has_special_msi_domain(struct pci_dev
*pdev
);
461 static inline struct irq_domain
*pci_msi_get_device_domain(struct pci_dev
*pdev
)
465 #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
467 #endif /* LINUX_MSI_H */