include/linux/msi.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef LINUX_MSI_H
   3 #define LINUX_MSI_H
   4
   5 #include <linux/kobject.h>
   6 #include <linux/list.h>
   7 #include <asm/msi.h>
   8
   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 {
  12         u32     address_lo;
  13 } __attribute__ ((packed)) arch_msi_msg_addr_lo_t;
  14 #endif
  15
  16 #ifndef arch_msi_msg_addr_hi
  17 typedef struct arch_msi_msg_addr_hi {
  18         u32     address_hi;
  19 } __attribute__ ((packed)) arch_msi_msg_addr_hi_t;
  20 #endif
  21
  22 #ifndef arch_msi_msg_data
  23 typedef struct arch_msi_msg_data {
  24         u32     data;
  25 } __attribute__ ((packed)) arch_msi_msg_data_t;
  26 #endif
  27
  28 /**
  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
  37  */
  38 struct msi_msg {
  39         union {
  40                 u32                     address_lo;
  41                 arch_msi_msg_addr_lo_t  arch_addr_lo;
  42         };
  43         union {
  44                 u32                     address_hi;
  45                 arch_msi_msg_addr_hi_t  arch_addr_hi;
  46         };
  47         union {
  48                 u32                     data;
  49                 arch_msi_msg_data_t     arch_data;
  50         };
  51 };
  52
  53 extern int pci_msi_ignore_mask;
  54 /* Helper functions */
  55 struct irq_data;
  56 struct msi_desc;
  57 struct pci_dev;
  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);
  62 #else
  63 static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
  64 {
  65 }
  66 #endif
  67
  68 typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
  69                                     struct msi_msg *msg);
  70
  71 /**
  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
  75  */
  76 struct platform_msi_desc {
  77         struct platform_msi_priv_data   *msi_priv_data;
  78         u16                             msi_index;
  79 };
  80
  81 /**
  82  * fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
  83  * @msi_index:          The index of the MSI descriptor
  84  */
  85 struct fsl_mc_msi_desc {
  86         u16                             msi_index;
  87 };
  88
  89 /**
  90  * ti_sci_inta_msi_desc - TISCI based INTA specific msi descriptor data
  91  * @dev_index: TISCI device index
  92  */
  93 struct ti_sci_inta_msi_desc {
  94         u16     dev_index;
  95 };
  96
  97 /**
  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
 105  *
 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.
 109  *
 110  * @masked:     [PCI MSI/X] Mask bits
 111  * @is_msix:    [PCI MSI/X] True if MSI-X
 112  * @multiple:   [PCI MSI/X] log2 num of messages allocated
 113  * @multi_cap:  [PCI MSI/X] log2 num of messages supported
 114  * @maskbit:    [PCI MSI/X] Mask-Pending bit supported?
 115  * @is_64:      [PCI MSI/X] Address size: 0=32bit 1=64bit
 116  * @entry_nr:   [PCI MSI/X] Entry which is described by this descriptor
 117  * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
 118  * @mask_pos:   [PCI MSI]   Mask register position
 119  * @mask_base:  [PCI MSI-X] Mask register base address
 120  * @platform:   [platform]  Platform device specific msi descriptor data
 121  * @fsl_mc:     [fsl-mc]    FSL MC device specific msi descriptor data
 122  * @inta:       [INTA]      TISCI based INTA specific msi descriptor data
 123  */
 124 struct msi_desc {
 125         /* Shared device/bus type independent data */
 126         struct list_head                list;
 127         unsigned int                    irq;
 128         unsigned int                    nvec_used;
 129         struct device                   *dev;
 130         struct msi_msg                  msg;
 131         struct irq_affinity_desc        *affinity;
 132 #ifdef CONFIG_IRQ_MSI_IOMMU
 133         const void                      *iommu_cookie;
 134 #endif
 135
 136         void (*write_msi_msg)(struct msi_desc *entry, void *data);
 137         void *write_msi_msg_data;
 138
 139         union {
 140                 /* PCI MSI/X specific data */
 141                 struct {
 142                         u32 masked;
 143                         struct {
 144                                 u8      is_msix         : 1;
 145                                 u8      multiple        : 3;
 146                                 u8      multi_cap       : 3;
 147                                 u8      maskbit         : 1;
 148                                 u8      is_64           : 1;
 149                                 u8      is_virtual      : 1;
 150                                 u16     entry_nr;
 151                                 unsigned default_irq;
 152                         } msi_attrib;
 153                         union {
 154                                 u8      mask_pos;
 155                                 void __iomem *mask_base;
 156                         };
 157                 };
 158
 159                 /*
 160                  * Non PCI variants add their data structure here. New
 161                  * entries need to use a named structure. We want
 162                  * proper name spaces for this. The PCI part is
 163                  * anonymous for now as it would require an immediate
 164                  * tree wide cleanup.
 165                  */
 166                 struct platform_msi_desc platform;
 167                 struct fsl_mc_msi_desc fsl_mc;
 168                 struct ti_sci_inta_msi_desc inta;
 169         };
 170 };
 171
 172 /* Helpers to hide struct msi_desc implementation details */
 173 #define msi_desc_to_dev(desc)           ((desc)->dev)
 174 #define dev_to_msi_list(dev)            (&(dev)->msi_list)
 175 #define first_msi_entry(dev)            \
 176         list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
 177 #define for_each_msi_entry(desc, dev)   \
 178         list_for_each_entry((desc), dev_to_msi_list((dev)), list)
 179 #define for_each_msi_entry_safe(desc, tmp, dev) \
 180         list_for_each_entry_safe((desc), (tmp), dev_to_msi_list((dev)), list)
 181 #define for_each_msi_vector(desc, __irq, dev)                           \
 182         for_each_msi_entry((desc), (dev))                               \
 183                 if ((desc)->irq)                                        \
 184                         for (__irq = (desc)->irq;                       \
 185                              __irq < ((desc)->irq + (desc)->nvec_used); \
 186                              __irq++)
 187
 188 #ifdef CONFIG_IRQ_MSI_IOMMU
 189 static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
 190 {
 191         return desc->iommu_cookie;
 192 }
 193
 194 static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
 195                                              const void *iommu_cookie)
 196 {
 197         desc->iommu_cookie = iommu_cookie;
 198 }
 199 #else
 200 static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
 201 {
 202         return NULL;
 203 }
 204
 205 static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
 206                                              const void *iommu_cookie)
 207 {
 208 }
 209 #endif
 210
 211 #ifdef CONFIG_PCI_MSI
 212 #define first_pci_msi_entry(pdev)       first_msi_entry(&(pdev)->dev)
 213 #define for_each_pci_msi_entry(desc, pdev)      \
 214         for_each_msi_entry((desc), &(pdev)->dev)
 215
 216 struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
 217 void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
 218 void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
 219 #else /* CONFIG_PCI_MSI */
 220 static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
 221 {
 222         return NULL;
 223 }
 224 static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
 225 {
 226 }
 227 #endif /* CONFIG_PCI_MSI */
 228
 229 struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
 230                                  const struct irq_affinity_desc *affinity);
 231 void free_msi_entry(struct msi_desc *entry);
 232 void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 233 void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 234
 235 u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
 236 u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
 237 void pci_msi_mask_irq(struct irq_data *data);
 238 void pci_msi_unmask_irq(struct irq_data *data);
 239
 240 /*
 241  * The arch hooks to setup up msi irqs. Default functions are implemented
 242  * as weak symbols so that they /can/ be overriden by architecture specific
 243  * code if needed. These hooks can only be enabled by the architecture.
 244  *
 245  * If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by
 246  * stubs with warnings.
 247  */
 248 #ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
 249 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
 250 void arch_teardown_msi_irq(unsigned int irq);
 251 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
 252 void arch_teardown_msi_irqs(struct pci_dev *dev);
 253 #else
 254 static inline int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 255 {
 256         WARN_ON_ONCE(1);
 257         return -ENODEV;
 258 }
 259
 260 static inline void arch_teardown_msi_irqs(struct pci_dev *dev)
 261 {
 262         WARN_ON_ONCE(1);
 263 }
 264 #endif
 265
 266 /*
 267  * The restore hooks are still available as they are useful even
 268  * for fully irq domain based setups. Courtesy to XEN/X86.
 269  */
 270 void arch_restore_msi_irqs(struct pci_dev *dev);
 271 void default_restore_msi_irqs(struct pci_dev *dev);
 272
 273 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 274
 275 #include <linux/irqhandler.h>
 276
 277 struct irq_domain;
 278 struct irq_domain_ops;
 279 struct irq_chip;
 280 struct device_node;
 281 struct fwnode_handle;
 282 struct msi_domain_info;
 283
 284 /**
 285  * struct msi_domain_ops - MSI interrupt domain callbacks
 286  * @get_hwirq:          Retrieve the resulting hw irq number
 287  * @msi_init:           Domain specific init function for MSI interrupts
 288  * @msi_free:           Domain specific function to free a MSI interrupts
 289  * @msi_check:          Callback for verification of the domain/info/dev data
 290  * @msi_prepare:        Prepare the allocation of the interrupts in the domain
 291  * @msi_finish:         Optional callback to finalize the allocation
 292  * @set_desc:           Set the msi descriptor for an interrupt
 293  * @handle_error:       Optional error handler if the allocation fails
 294  * @domain_alloc_irqs:  Optional function to override the default allocation
 295  *                      function.
 296  * @domain_free_irqs:   Optional function to override the default free
 297  *                      function.
 298  *
 299  * @get_hwirq, @msi_init and @msi_free are callbacks used by
 300  * msi_create_irq_domain() and related interfaces
 301  *
 302  * @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error
 303  * are callbacks used by msi_domain_alloc_irqs() and related
 304  * interfaces which are based on msi_desc.
 305  *
 306  * @domain_alloc_irqs, @domain_free_irqs can be used to override the
 307  * default allocation/free functions (__msi_domain_alloc/free_irqs). This
 308  * is initially for a wrapper around XENs seperate MSI universe which can't
 309  * be wrapped into the regular irq domains concepts by mere mortals.  This
 310  * allows to universally use msi_domain_alloc/free_irqs without having to
 311  * special case XEN all over the place.
 312  *
 313  * Contrary to other operations @domain_alloc_irqs and @domain_free_irqs
 314  * are set to the default implementation if NULL and even when
 315  * MSI_FLAG_USE_DEF_DOM_OPS is not set to avoid breaking existing users and
 316  * because these callbacks are obviously mandatory.
 317  *
 318  * This is NOT meant to be abused, but it can be useful to build wrappers
 319  * for specialized MSI irq domains which need extra work before and after
 320  * calling __msi_domain_alloc_irqs()/__msi_domain_free_irqs().
 321  */
 322 struct msi_domain_ops {
 323         irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info,
 324                                      msi_alloc_info_t *arg);
 325         int             (*msi_init)(struct irq_domain *domain,
 326                                     struct msi_domain_info *info,
 327                                     unsigned int virq, irq_hw_number_t hwirq,
 328                                     msi_alloc_info_t *arg);
 329         void            (*msi_free)(struct irq_domain *domain,
 330                                     struct msi_domain_info *info,
 331                                     unsigned int virq);
 332         int             (*msi_check)(struct irq_domain *domain,
 333                                      struct msi_domain_info *info,
 334                                      struct device *dev);
 335         int             (*msi_prepare)(struct irq_domain *domain,
 336                                        struct device *dev, int nvec,
 337                                        msi_alloc_info_t *arg);
 338         void            (*msi_finish)(msi_alloc_info_t *arg, int retval);
 339         void            (*set_desc)(msi_alloc_info_t *arg,
 340                                     struct msi_desc *desc);
 341         int             (*handle_error)(struct irq_domain *domain,
 342                                         struct msi_desc *desc, int error);
 343         int             (*domain_alloc_irqs)(struct irq_domain *domain,
 344                                              struct device *dev, int nvec);
 345         void            (*domain_free_irqs)(struct irq_domain *domain,
 346                                             struct device *dev);
 347 };
 348
 349 /**
 350  * struct msi_domain_info - MSI interrupt domain data
 351  * @flags:              Flags to decribe features and capabilities
 352  * @ops:                The callback data structure
 353  * @chip:               Optional: associated interrupt chip
 354  * @chip_data:          Optional: associated interrupt chip data
 355  * @handler:            Optional: associated interrupt flow handler
 356  * @handler_data:       Optional: associated interrupt flow handler data
 357  * @handler_name:       Optional: associated interrupt flow handler name
 358  * @data:               Optional: domain specific data
 359  */
 360 struct msi_domain_info {
 361         u32                     flags;
 362         struct msi_domain_ops   *ops;
 363         struct irq_chip         *chip;
 364         void                    *chip_data;
 365         irq_flow_handler_t      handler;
 366         void                    *handler_data;
 367         const char              *handler_name;
 368         void                    *data;
 369 };
 370
 371 /* Flags for msi_domain_info */
 372 enum {
 373         /*
 374          * Init non implemented ops callbacks with default MSI domain
 375          * callbacks.
 376          */
 377         MSI_FLAG_USE_DEF_DOM_OPS        = (1 << 0),
 378         /*
 379          * Init non implemented chip callbacks with default MSI chip
 380          * callbacks.
 381          */
 382         MSI_FLAG_USE_DEF_CHIP_OPS       = (1 << 1),
 383         /* Support multiple PCI MSI interrupts */
 384         MSI_FLAG_MULTI_PCI_MSI          = (1 << 2),
 385         /* Support PCI MSIX interrupts */
 386         MSI_FLAG_PCI_MSIX               = (1 << 3),
 387         /* Needs early activate, required for PCI */
 388         MSI_FLAG_ACTIVATE_EARLY         = (1 << 4),
 389         /*
 390          * Must reactivate when irq is started even when
 391          * MSI_FLAG_ACTIVATE_EARLY has been set.
 392          */
 393         MSI_FLAG_MUST_REACTIVATE        = (1 << 5),
 394         /* Is level-triggered capable, using two messages */
 395         MSI_FLAG_LEVEL_CAPABLE          = (1 << 6),
 396 };
 397
 398 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
 399                             bool force);
 400
 401 struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
 402                                          struct msi_domain_info *info,
 403                                          struct irq_domain *parent);
 404 int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 405                             int nvec);
 406 int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 407                           int nvec);
 408 void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
 409 void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
 410 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
 411
 412 struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
 413                                                   struct msi_domain_info *info,
 414                                                   struct irq_domain *parent);
 415 int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
 416                                    irq_write_msi_msg_t write_msi_msg);
 417 void platform_msi_domain_free_irqs(struct device *dev);
 418
 419 /* When an MSI domain is used as an intermediate domain */
 420 int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
 421                             int nvec, msi_alloc_info_t *args);
 422 int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
 423                              int virq, int nvec, msi_alloc_info_t *args);
 424 struct irq_domain *
 425 __platform_msi_create_device_domain(struct device *dev,
 426                                     unsigned int nvec,
 427                                     bool is_tree,
 428                                     irq_write_msi_msg_t write_msi_msg,
 429                                     const struct irq_domain_ops *ops,
 430                                     void *host_data);
 431
 432 #define platform_msi_create_device_domain(dev, nvec, write, ops, data)  \
 433         __platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
 434 #define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
 435         __platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
 436
 437 int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
 438                               unsigned int nr_irqs);
 439 void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
 440                               unsigned int nvec);
 441 void *platform_msi_get_host_data(struct irq_domain *domain);
 442 #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
 443
 444 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
 445 void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
 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 int pci_msi_domain_check_cap(struct irq_domain *domain,
 450                              struct msi_domain_info *info, struct device *dev);
 451 u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
 452 struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
 453 bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
 454 #else
 455 static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
 456 {
 457         return NULL;
 458 }
 459 #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
 460
 461 #endif /* LINUX_MSI_H */