1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/cpumask.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 struct attribute_group;
61 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
62 #ifdef CONFIG_GENERIC_MSI_IRQ
63 void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
65 static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
70 typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
74 * pci_msi_desc - PCI/MSI specific MSI descriptor data
76 * @msi_mask: [PCI MSI] MSI cached mask bits
77 * @msix_ctrl: [PCI MSI-X] MSI-X cached per vector control bits
78 * @is_msix: [PCI MSI/X] True if MSI-X
79 * @multiple: [PCI MSI/X] log2 num of messages allocated
80 * @multi_cap: [PCI MSI/X] log2 num of messages supported
81 * @can_mask: [PCI MSI/X] Masking supported?
82 * @is_64: [PCI MSI/X] Address size: 0=32bit 1=64bit
83 * @entry_nr: [PCI MSI/X] Entry which is described by this descriptor
84 * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
85 * @mask_pos: [PCI MSI] Mask register position
86 * @mask_base: [PCI MSI-X] Mask register base address
101 unsigned default_irq;
105 void __iomem *mask_base;
110 * platform_msi_desc - Platform device specific msi descriptor data
111 * @msi_priv_data: Pointer to platform private data
112 * @msi_index: The index of the MSI descriptor for multi MSI
114 struct platform_msi_desc {
115 struct platform_msi_priv_data *msi_priv_data;
120 * fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
121 * @msi_index: The index of the MSI descriptor
123 struct fsl_mc_msi_desc {
128 * ti_sci_inta_msi_desc - TISCI based INTA specific msi descriptor data
129 * @dev_index: TISCI device index
131 struct ti_sci_inta_msi_desc {
136 * struct msi_desc - Descriptor structure for MSI based interrupts
137 * @list: List head for management
138 * @irq: The base interrupt number
139 * @nvec_used: The number of vectors used
140 * @dev: Pointer to the device which uses this descriptor
141 * @msg: The last set MSI message cached for reuse
142 * @affinity: Optional pointer to a cpu affinity mask for this descriptor
144 * @write_msi_msg: Callback that may be called when the MSI message
145 * address or data changes
146 * @write_msi_msg_data: Data parameter for the callback.
148 * @pci: [PCI] PCI speficic msi descriptor data
149 * @platform: [platform] Platform device specific msi descriptor data
150 * @fsl_mc: [fsl-mc] FSL MC device specific msi descriptor data
151 * @inta: [INTA] TISCI based INTA specific msi descriptor data
154 /* Shared device/bus type independent data */
155 struct list_head list;
157 unsigned int nvec_used;
160 struct irq_affinity_desc *affinity;
161 #ifdef CONFIG_IRQ_MSI_IOMMU
162 const void *iommu_cookie;
165 void (*write_msi_msg)(struct msi_desc *entry, void *data);
166 void *write_msi_msg_data;
169 struct pci_msi_desc pci;
170 struct platform_msi_desc platform;
171 struct fsl_mc_msi_desc fsl_mc;
172 struct ti_sci_inta_msi_desc inta;
177 * msi_device_data - MSI per device data
178 * @properties: MSI properties which are interesting to drivers
179 * @attrs: Pointer to the sysfs attribute group
181 struct msi_device_data {
182 unsigned long properties;
183 const struct attribute_group **attrs;
186 int msi_setup_device_data(struct device *dev);
188 /* Helpers to hide struct msi_desc implementation details */
189 #define msi_desc_to_dev(desc) ((desc)->dev)
190 #define dev_to_msi_list(dev) (&(dev)->msi_list)
191 #define first_msi_entry(dev) \
192 list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
193 #define for_each_msi_entry(desc, dev) \
194 list_for_each_entry((desc), dev_to_msi_list((dev)), list)
195 #define for_each_msi_entry_safe(desc, tmp, dev) \
196 list_for_each_entry_safe((desc), (tmp), dev_to_msi_list((dev)), list)
197 #define for_each_msi_vector(desc, __irq, dev) \
198 for_each_msi_entry((desc), (dev)) \
200 for (__irq = (desc)->irq; \
201 __irq < ((desc)->irq + (desc)->nvec_used); \
204 #ifdef CONFIG_IRQ_MSI_IOMMU
205 static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
207 return desc->iommu_cookie;
210 static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
211 const void *iommu_cookie)
213 desc->iommu_cookie = iommu_cookie;
216 static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
221 static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
222 const void *iommu_cookie)
227 #ifdef CONFIG_PCI_MSI
228 #define first_pci_msi_entry(pdev) first_msi_entry(&(pdev)->dev)
229 #define for_each_pci_msi_entry(desc, pdev) \
230 for_each_msi_entry((desc), &(pdev)->dev)
232 struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
233 void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
234 #else /* CONFIG_PCI_MSI */
235 static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
238 #endif /* CONFIG_PCI_MSI */
240 struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
241 const struct irq_affinity_desc *affinity);
242 void free_msi_entry(struct msi_desc *entry);
243 void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
244 void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
246 void pci_msi_mask_irq(struct irq_data *data);
247 void pci_msi_unmask_irq(struct irq_data *data);
250 int msi_device_populate_sysfs(struct device *dev);
251 void msi_device_destroy_sysfs(struct device *dev);
252 #else /* CONFIG_SYSFS */
253 static inline int msi_device_populate_sysfs(struct device *dev) { return 0; }
254 static inline void msi_device_destroy_sysfs(struct device *dev) { }
255 #endif /* !CONFIG_SYSFS */
258 * The arch hooks to setup up msi irqs. Default functions are implemented
259 * as weak symbols so that they /can/ be overriden by architecture specific
260 * code if needed. These hooks can only be enabled by the architecture.
262 * If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by
263 * stubs with warnings.
265 #ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
266 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
267 void arch_teardown_msi_irq(unsigned int irq);
268 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
269 void arch_teardown_msi_irqs(struct pci_dev *dev);
270 #endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
273 * The restore hook is still available even for fully irq domain based
274 * setups. Courtesy to XEN/X86.
276 bool arch_restore_msi_irqs(struct pci_dev *dev);
278 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
280 #include <linux/irqhandler.h>
283 struct irq_domain_ops;
286 struct fwnode_handle;
287 struct msi_domain_info;
290 * struct msi_domain_ops - MSI interrupt domain callbacks
291 * @get_hwirq: Retrieve the resulting hw irq number
292 * @msi_init: Domain specific init function for MSI interrupts
293 * @msi_free: Domain specific function to free a MSI interrupts
294 * @msi_check: Callback for verification of the domain/info/dev data
295 * @msi_prepare: Prepare the allocation of the interrupts in the domain
296 * @set_desc: Set the msi descriptor for an interrupt
297 * @domain_alloc_irqs: Optional function to override the default allocation
299 * @domain_free_irqs: Optional function to override the default free
302 * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying
305 * @msi_check, @msi_prepare and @set_desc are callbacks used by
306 * msi_domain_alloc/free_irqs().
308 * @domain_alloc_irqs, @domain_free_irqs can be used to override the
309 * default allocation/free functions (__msi_domain_alloc/free_irqs). This
310 * is initially for a wrapper around XENs seperate MSI universe which can't
311 * be wrapped into the regular irq domains concepts by mere mortals. This
312 * allows to universally use msi_domain_alloc/free_irqs without having to
313 * special case XEN all over the place.
315 * Contrary to other operations @domain_alloc_irqs and @domain_free_irqs
316 * are set to the default implementation if NULL and even when
317 * MSI_FLAG_USE_DEF_DOM_OPS is not set to avoid breaking existing users and
318 * because these callbacks are obviously mandatory.
320 * This is NOT meant to be abused, but it can be useful to build wrappers
321 * for specialized MSI irq domains which need extra work before and after
322 * calling __msi_domain_alloc_irqs()/__msi_domain_free_irqs().
324 struct msi_domain_ops {
325 irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info,
326 msi_alloc_info_t *arg);
327 int (*msi_init)(struct irq_domain *domain,
328 struct msi_domain_info *info,
329 unsigned int virq, irq_hw_number_t hwirq,
330 msi_alloc_info_t *arg);
331 void (*msi_free)(struct irq_domain *domain,
332 struct msi_domain_info *info,
334 int (*msi_check)(struct irq_domain *domain,
335 struct msi_domain_info *info,
337 int (*msi_prepare)(struct irq_domain *domain,
338 struct device *dev, int nvec,
339 msi_alloc_info_t *arg);
340 void (*set_desc)(msi_alloc_info_t *arg,
341 struct msi_desc *desc);
342 int (*domain_alloc_irqs)(struct irq_domain *domain,
343 struct device *dev, int nvec);
344 void (*domain_free_irqs)(struct irq_domain *domain,
349 * struct msi_domain_info - MSI interrupt domain data
350 * @flags: Flags to decribe features and capabilities
351 * @ops: The callback data structure
352 * @chip: Optional: associated interrupt chip
353 * @chip_data: Optional: associated interrupt chip data
354 * @handler: Optional: associated interrupt flow handler
355 * @handler_data: Optional: associated interrupt flow handler data
356 * @handler_name: Optional: associated interrupt flow handler name
357 * @data: Optional: domain specific data
359 struct msi_domain_info {
361 struct msi_domain_ops *ops;
362 struct irq_chip *chip;
364 irq_flow_handler_t handler;
366 const char *handler_name;
370 /* Flags for msi_domain_info */
373 * Init non implemented ops callbacks with default MSI domain
376 MSI_FLAG_USE_DEF_DOM_OPS = (1 << 0),
378 * Init non implemented chip callbacks with default MSI chip
381 MSI_FLAG_USE_DEF_CHIP_OPS = (1 << 1),
382 /* Support multiple PCI MSI interrupts */
383 MSI_FLAG_MULTI_PCI_MSI = (1 << 2),
384 /* Support PCI MSIX interrupts */
385 MSI_FLAG_PCI_MSIX = (1 << 3),
386 /* Needs early activate, required for PCI */
387 MSI_FLAG_ACTIVATE_EARLY = (1 << 4),
389 * Must reactivate when irq is started even when
390 * MSI_FLAG_ACTIVATE_EARLY has been set.
392 MSI_FLAG_MUST_REACTIVATE = (1 << 5),
393 /* Is level-triggered capable, using two messages */
394 MSI_FLAG_LEVEL_CAPABLE = (1 << 6),
395 /* Populate sysfs on alloc() and destroy it on free() */
396 MSI_FLAG_DEV_SYSFS = (1 << 7),
399 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
402 struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
403 struct msi_domain_info *info,
404 struct irq_domain *parent);
405 int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
407 int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
409 void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
410 void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
411 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
413 struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
414 struct msi_domain_info *info,
415 struct irq_domain *parent);
416 int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
417 irq_write_msi_msg_t write_msi_msg);
418 void platform_msi_domain_free_irqs(struct device *dev);
420 /* When an MSI domain is used as an intermediate domain */
421 int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
422 int nvec, msi_alloc_info_t *args);
423 int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
424 int virq, int nvec, msi_alloc_info_t *args);
426 __platform_msi_create_device_domain(struct device *dev,
429 irq_write_msi_msg_t write_msi_msg,
430 const struct irq_domain_ops *ops,
433 #define platform_msi_create_device_domain(dev, nvec, write, ops, data) \
434 __platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
435 #define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
436 __platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
438 int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
439 unsigned int nr_irqs);
440 void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
442 void *platform_msi_get_host_data(struct irq_domain *domain);
443 #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
445 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
446 struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
447 struct msi_domain_info *info,
448 struct irq_domain *parent);
449 u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
450 struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
451 bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
453 static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
457 #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
459 #endif /* LINUX_MSI_H */