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
   8 struct msi_msg {
   9         u32     address_lo;     /* low 32 bits of msi message address */
  10         u32     address_hi;     /* high 32 bits of msi message address */
  11         u32     data;           /* 16 bits of msi message data */
  12 };
  13
  14 extern int pci_msi_ignore_mask;
  15 /* Helper functions */
  16 struct irq_data;
  17 struct msi_desc;
  18 struct pci_dev;
  19 struct platform_msi_priv_data;
  20 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  21 #ifdef CONFIG_GENERIC_MSI_IRQ
  22 void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
  23 #else
  24 static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
  25 {
  26 }
  27 #endif
  28
  29 typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
  30                                     struct msi_msg *msg);
  31
  32 /**
  33  * platform_msi_desc - Platform device specific msi descriptor data
  34  * @msi_priv_data:      Pointer to platform private data
  35  * @msi_index:          The index of the MSI descriptor for multi MSI
  36  */
  37 struct platform_msi_desc {
  38         struct platform_msi_priv_data   *msi_priv_data;
  39         u16                             msi_index;
  40 };
  41
  42 /**
  43  * fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
  44  * @msi_index:          The index of the MSI descriptor
  45  */
  46 struct fsl_mc_msi_desc {
  47         u16                             msi_index;
  48 };
  49
  50 /**
  51  * struct msi_desc - Descriptor structure for MSI based interrupts
  52  * @list:       List head for management
  53  * @irq:        The base interrupt number
  54  * @nvec_used:  The number of vectors used
  55  * @dev:        Pointer to the device which uses this descriptor
  56  * @msg:        The last set MSI message cached for reuse
  57  * @affinity:   Optional pointer to a cpu affinity mask for this descriptor
  58  *
  59  * @masked:     [PCI MSI/X] Mask bits
  60  * @is_msix:    [PCI MSI/X] True if MSI-X
  61  * @multiple:   [PCI MSI/X] log2 num of messages allocated
  62  * @multi_cap:  [PCI MSI/X] log2 num of messages supported
  63  * @maskbit:    [PCI MSI/X] Mask-Pending bit supported?
  64  * @is_64:      [PCI MSI/X] Address size: 0=32bit 1=64bit
  65  * @entry_nr:   [PCI MSI/X] Entry which is described by this descriptor
  66  * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
  67  * @mask_pos:   [PCI MSI]   Mask register position
  68  * @mask_base:  [PCI MSI-X] Mask register base address
  69  * @platform:   [platform]  Platform device specific msi descriptor data
  70  * @fsl_mc:     [fsl-mc]    FSL MC device specific msi descriptor data
  71  */
  72 struct msi_desc {
  73         /* Shared device/bus type independent data */
  74         struct list_head                list;
  75         unsigned int                    irq;
  76         unsigned int                    nvec_used;
  77         struct device                   *dev;
  78         struct msi_msg                  msg;
  79         struct cpumask                  *affinity;
  80
  81         union {
  82                 /* PCI MSI/X specific data */
  83                 struct {
  84                         u32 masked;
  85                         struct {
  86                                 __u8    is_msix         : 1;
  87                                 __u8    multiple        : 3;
  88                                 __u8    multi_cap       : 3;
  89                                 __u8    maskbit         : 1;
  90                                 __u8    is_64           : 1;
  91                                 __u16   entry_nr;
  92                                 unsigned default_irq;
  93                         } msi_attrib;
  94                         union {
  95                                 u8      mask_pos;
  96                                 void __iomem *mask_base;
  97                         };
  98                 };
  99
 100                 /*
 101                  * Non PCI variants add their data structure here. New
 102                  * entries need to use a named structure. We want
 103                  * proper name spaces for this. The PCI part is
 104                  * anonymous for now as it would require an immediate
 105                  * tree wide cleanup.
 106                  */
 107                 struct platform_msi_desc platform;
 108                 struct fsl_mc_msi_desc fsl_mc;
 109         };
 110 };
 111
 112 /* Helpers to hide struct msi_desc implementation details */
 113 #define msi_desc_to_dev(desc)           ((desc)->dev)
 114 #define dev_to_msi_list(dev)            (&(dev)->msi_list)
 115 #define first_msi_entry(dev)            \
 116         list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
 117 #define for_each_msi_entry(desc, dev)   \
 118         list_for_each_entry((desc), dev_to_msi_list((dev)), list)
 119
 120 #ifdef CONFIG_PCI_MSI
 121 #define first_pci_msi_entry(pdev)       first_msi_entry(&(pdev)->dev)
 122 #define for_each_pci_msi_entry(desc, pdev)      \
 123         for_each_msi_entry((desc), &(pdev)->dev)
 124
 125 struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
 126 void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
 127 void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
 128 #else /* CONFIG_PCI_MSI */
 129 static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
 130 {
 131         return NULL;
 132 }
 133 static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
 134 {
 135 }
 136 #endif /* CONFIG_PCI_MSI */
 137
 138 struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
 139                                  const struct cpumask *affinity);
 140 void free_msi_entry(struct msi_desc *entry);
 141 void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 142 void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 143
 144 u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
 145 u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
 146 void pci_msi_mask_irq(struct irq_data *data);
 147 void pci_msi_unmask_irq(struct irq_data *data);
 148
 149 /* Conversion helpers. Should be removed after merging */
 150 static inline void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
 151 {
 152         __pci_write_msi_msg(entry, msg);
 153 }
 154 static inline void write_msi_msg(int irq, struct msi_msg *msg)
 155 {
 156         pci_write_msi_msg(irq, msg);
 157 }
 158 static inline void mask_msi_irq(struct irq_data *data)
 159 {
 160         pci_msi_mask_irq(data);
 161 }
 162 static inline void unmask_msi_irq(struct irq_data *data)
 163 {
 164         pci_msi_unmask_irq(data);
 165 }
 166
 167 /*
 168  * The arch hooks to setup up msi irqs. Those functions are
 169  * implemented as weak symbols so that they /can/ be overriden by
 170  * architecture specific code if needed.
 171  */
 172 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
 173 void arch_teardown_msi_irq(unsigned int irq);
 174 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
 175 void arch_teardown_msi_irqs(struct pci_dev *dev);
 176 void arch_restore_msi_irqs(struct pci_dev *dev);
 177
 178 void default_teardown_msi_irqs(struct pci_dev *dev);
 179 void default_restore_msi_irqs(struct pci_dev *dev);
 180
 181 struct msi_controller {
 182         struct module *owner;
 183         struct device *dev;
 184         struct device_node *of_node;
 185         struct list_head list;
 186
 187         int (*setup_irq)(struct msi_controller *chip, struct pci_dev *dev,
 188                          struct msi_desc *desc);
 189         int (*setup_irqs)(struct msi_controller *chip, struct pci_dev *dev,
 190                           int nvec, int type);
 191         void (*teardown_irq)(struct msi_controller *chip, unsigned int irq);
 192 };
 193
 194 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 195
 196 #include <linux/irqhandler.h>
 197 #include <asm/msi.h>
 198
 199 struct irq_domain;
 200 struct irq_domain_ops;
 201 struct irq_chip;
 202 struct device_node;
 203 struct fwnode_handle;
 204 struct msi_domain_info;
 205
 206 /**
 207  * struct msi_domain_ops - MSI interrupt domain callbacks
 208  * @get_hwirq:          Retrieve the resulting hw irq number
 209  * @msi_init:           Domain specific init function for MSI interrupts
 210  * @msi_free:           Domain specific function to free a MSI interrupts
 211  * @msi_check:          Callback for verification of the domain/info/dev data
 212  * @msi_prepare:        Prepare the allocation of the interrupts in the domain
 213  * @msi_finish:         Optional callback to finalize the allocation
 214  * @set_desc:           Set the msi descriptor for an interrupt
 215  * @handle_error:       Optional error handler if the allocation fails
 216  *
 217  * @get_hwirq, @msi_init and @msi_free are callbacks used by
 218  * msi_create_irq_domain() and related interfaces
 219  *
 220  * @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error
 221  * are callbacks used by msi_domain_alloc_irqs() and related
 222  * interfaces which are based on msi_desc.
 223  */
 224 struct msi_domain_ops {
 225         irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info,
 226                                      msi_alloc_info_t *arg);
 227         int             (*msi_init)(struct irq_domain *domain,
 228                                     struct msi_domain_info *info,
 229                                     unsigned int virq, irq_hw_number_t hwirq,
 230                                     msi_alloc_info_t *arg);
 231         void            (*msi_free)(struct irq_domain *domain,
 232                                     struct msi_domain_info *info,
 233                                     unsigned int virq);
 234         int             (*msi_check)(struct irq_domain *domain,
 235                                      struct msi_domain_info *info,
 236                                      struct device *dev);
 237         int             (*msi_prepare)(struct irq_domain *domain,
 238                                        struct device *dev, int nvec,
 239                                        msi_alloc_info_t *arg);
 240         void            (*msi_finish)(msi_alloc_info_t *arg, int retval);
 241         void            (*set_desc)(msi_alloc_info_t *arg,
 242                                     struct msi_desc *desc);
 243         int             (*handle_error)(struct irq_domain *domain,
 244                                         struct msi_desc *desc, int error);
 245 };
 246
 247 /**
 248  * struct msi_domain_info - MSI interrupt domain data
 249  * @flags:              Flags to decribe features and capabilities
 250  * @ops:                The callback data structure
 251  * @chip:               Optional: associated interrupt chip
 252  * @chip_data:          Optional: associated interrupt chip data
 253  * @handler:            Optional: associated interrupt flow handler
 254  * @handler_data:       Optional: associated interrupt flow handler data
 255  * @handler_name:       Optional: associated interrupt flow handler name
 256  * @data:               Optional: domain specific data
 257  */
 258 struct msi_domain_info {
 259         u32                     flags;
 260         struct msi_domain_ops   *ops;
 261         struct irq_chip         *chip;
 262         void                    *chip_data;
 263         irq_flow_handler_t      handler;
 264         void                    *handler_data;
 265         const char              *handler_name;
 266         void                    *data;
 267 };
 268
 269 /* Flags for msi_domain_info */
 270 enum {
 271         /*
 272          * Init non implemented ops callbacks with default MSI domain
 273          * callbacks.
 274          */
 275         MSI_FLAG_USE_DEF_DOM_OPS        = (1 << 0),
 276         /*
 277          * Init non implemented chip callbacks with default MSI chip
 278          * callbacks.
 279          */
 280         MSI_FLAG_USE_DEF_CHIP_OPS       = (1 << 1),
 281         /* Support multiple PCI MSI interrupts */
 282         MSI_FLAG_MULTI_PCI_MSI          = (1 << 2),
 283         /* Support PCI MSIX interrupts */
 284         MSI_FLAG_PCI_MSIX               = (1 << 3),
 285         /* Needs early activate, required for PCI */
 286         MSI_FLAG_ACTIVATE_EARLY         = (1 << 4),
 287         /*
 288          * Must reactivate when irq is started even when
 289          * MSI_FLAG_ACTIVATE_EARLY has been set.
 290          */
 291         MSI_FLAG_MUST_REACTIVATE        = (1 << 5),
 292 };
 293
 294 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
 295                             bool force);
 296
 297 struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
 298                                          struct msi_domain_info *info,
 299                                          struct irq_domain *parent);
 300 int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 301                           int nvec);
 302 void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
 303 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
 304
 305 struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
 306                                                   struct msi_domain_info *info,
 307                                                   struct irq_domain *parent);
 308 int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
 309                                    irq_write_msi_msg_t write_msi_msg);
 310 void platform_msi_domain_free_irqs(struct device *dev);
 311
 312 /* When an MSI domain is used as an intermediate domain */
 313 int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
 314                             int nvec, msi_alloc_info_t *args);
 315 int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
 316                              int virq, int nvec, msi_alloc_info_t *args);
 317 struct irq_domain *
 318 platform_msi_create_device_domain(struct device *dev,
 319                                   unsigned int nvec,
 320                                   irq_write_msi_msg_t write_msi_msg,
 321                                   const struct irq_domain_ops *ops,
 322                                   void *host_data);
 323 int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
 324                               unsigned int nr_irqs);
 325 void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
 326                               unsigned int nvec);
 327 void *platform_msi_get_host_data(struct irq_domain *domain);
 328 #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
 329
 330 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
 331 void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
 332 struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 333                                              struct msi_domain_info *info,
 334                                              struct irq_domain *parent);
 335 irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
 336                                           struct msi_desc *desc);
 337 int pci_msi_domain_check_cap(struct irq_domain *domain,
 338                              struct msi_domain_info *info, struct device *dev);
 339 u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
 340 struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
 341 #else
 342 static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
 343 {
 344         return NULL;
 345 }
 346 #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
 347
 348 #endif /* LINUX_MSI_H */