include/linux/msi.h

   1 #ifndef LINUX_MSI_H
   2 #define LINUX_MSI_H
   3
   4 #include <linux/kobject.h>
   5 #include <linux/list.h>
   6
   7 struct msi_msg {
   8         u32     address_lo;     /* low 32 bits of msi message address */
   9         u32     address_hi;     /* high 32 bits of msi message address */
  10         u32     data;           /* 16 bits of msi message data */
  11 };
  12
  13 extern int pci_msi_ignore_mask;
  14 /* Helper functions */
  15 struct irq_data;
  16 struct msi_desc;
  17 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  18 void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
  19
  20 struct msi_desc {
  21         struct {
  22                 __u8    is_msix : 1;
  23                 __u8    multiple: 3;    /* log2 num of messages allocated */
  24                 __u8    multi_cap : 3;  /* log2 num of messages supported */
  25                 __u8    maskbit : 1;    /* mask-pending bit supported ? */
  26                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit */
  27                 __u16   entry_nr;       /* specific enabled entry */
  28                 unsigned default_irq;   /* default pre-assigned irq */
  29         } msi_attrib;
  30
  31         u32 masked;                     /* mask bits */
  32         unsigned int irq;
  33         unsigned int nvec_used;         /* number of messages */
  34         struct list_head list;
  35
  36         union {
  37                 void __iomem *mask_base;
  38                 u8 mask_pos;
  39         };
  40         struct pci_dev *dev;
  41
  42         /* Last set MSI message */
  43         struct msi_msg msg;
  44 };
  45
  46 /* Helpers to hide struct msi_desc implementation details */
  47 #define msi_desc_to_dev(desc)           (&(desc)->dev.dev)
  48 #define dev_to_msi_list(dev)            (&to_pci_dev((dev))->msi_list)
  49 #define first_msi_entry(dev)            \
  50         list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
  51 #define for_each_msi_entry(desc, dev)   \
  52         list_for_each_entry((desc), dev_to_msi_list((dev)), list)
  53
  54 #ifdef CONFIG_PCI_MSI
  55 #define first_pci_msi_entry(pdev)       first_msi_entry(&(pdev)->dev)
  56 #define for_each_pci_msi_entry(desc, pdev)      \
  57         for_each_msi_entry((desc), &(pdev)->dev)
  58
  59 static inline struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
  60 {
  61         return desc->dev;
  62 }
  63 #endif /* CONFIG_PCI_MSI */
  64
  65 void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  66 void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  67 void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
  68
  69 u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
  70 u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
  71 void pci_msi_mask_irq(struct irq_data *data);
  72 void pci_msi_unmask_irq(struct irq_data *data);
  73
  74 /* Conversion helpers. Should be removed after merging */
  75 static inline void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
  76 {
  77         __pci_write_msi_msg(entry, msg);
  78 }
  79 static inline void write_msi_msg(int irq, struct msi_msg *msg)
  80 {
  81         pci_write_msi_msg(irq, msg);
  82 }
  83 static inline void mask_msi_irq(struct irq_data *data)
  84 {
  85         pci_msi_mask_irq(data);
  86 }
  87 static inline void unmask_msi_irq(struct irq_data *data)
  88 {
  89         pci_msi_unmask_irq(data);
  90 }
  91
  92 /*
  93  * The arch hooks to setup up msi irqs. Those functions are
  94  * implemented as weak symbols so that they /can/ be overriden by
  95  * architecture specific code if needed.
  96  */
  97 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
  98 void arch_teardown_msi_irq(unsigned int irq);
  99 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
 100 void arch_teardown_msi_irqs(struct pci_dev *dev);
 101 void arch_restore_msi_irqs(struct pci_dev *dev);
 102
 103 void default_teardown_msi_irqs(struct pci_dev *dev);
 104 void default_restore_msi_irqs(struct pci_dev *dev);
 105
 106 struct msi_controller {
 107         struct module *owner;
 108         struct device *dev;
 109         struct device_node *of_node;
 110         struct list_head list;
 111 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 112         struct irq_domain *domain;
 113 #endif
 114
 115         int (*setup_irq)(struct msi_controller *chip, struct pci_dev *dev,
 116                          struct msi_desc *desc);
 117         void (*teardown_irq)(struct msi_controller *chip, unsigned int irq);
 118 };
 119
 120 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 121
 122 #include <linux/irqhandler.h>
 123 #include <asm/msi.h>
 124
 125 struct irq_domain;
 126 struct irq_chip;
 127 struct device_node;
 128 struct msi_domain_info;
 129
 130 /**
 131  * struct msi_domain_ops - MSI interrupt domain callbacks
 132  * @get_hwirq:          Retrieve the resulting hw irq number
 133  * @msi_init:           Domain specific init function for MSI interrupts
 134  * @msi_free:           Domain specific function to free a MSI interrupts
 135  * @msi_check:          Callback for verification of the domain/info/dev data
 136  * @msi_prepare:        Prepare the allocation of the interrupts in the domain
 137  * @msi_finish:         Optional callbacl to finalize the allocation
 138  * @set_desc:           Set the msi descriptor for an interrupt
 139  * @handle_error:       Optional error handler if the allocation fails
 140  *
 141  * @get_hwirq, @msi_init and @msi_free are callbacks used by
 142  * msi_create_irq_domain() and related interfaces
 143  *
 144  * @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error
 145  * are callbacks used by msi_irq_domain_alloc_irqs() and related
 146  * interfaces which are based on msi_desc.
 147  */
 148 struct msi_domain_ops {
 149         irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info,
 150                                      msi_alloc_info_t *arg);
 151         int             (*msi_init)(struct irq_domain *domain,
 152                                     struct msi_domain_info *info,
 153                                     unsigned int virq, irq_hw_number_t hwirq,
 154                                     msi_alloc_info_t *arg);
 155         void            (*msi_free)(struct irq_domain *domain,
 156                                     struct msi_domain_info *info,
 157                                     unsigned int virq);
 158         int             (*msi_check)(struct irq_domain *domain,
 159                                      struct msi_domain_info *info,
 160                                      struct device *dev);
 161         int             (*msi_prepare)(struct irq_domain *domain,
 162                                        struct device *dev, int nvec,
 163                                        msi_alloc_info_t *arg);
 164         void            (*msi_finish)(msi_alloc_info_t *arg, int retval);
 165         void            (*set_desc)(msi_alloc_info_t *arg,
 166                                     struct msi_desc *desc);
 167         int             (*handle_error)(struct irq_domain *domain,
 168                                         struct msi_desc *desc, int error);
 169 };
 170
 171 /**
 172  * struct msi_domain_info - MSI interrupt domain data
 173  * @flags:              Flags to decribe features and capabilities
 174  * @ops:                The callback data structure
 175  * @chip:               Optional: associated interrupt chip
 176  * @chip_data:          Optional: associated interrupt chip data
 177  * @handler:            Optional: associated interrupt flow handler
 178  * @handler_data:       Optional: associated interrupt flow handler data
 179  * @handler_name:       Optional: associated interrupt flow handler name
 180  * @data:               Optional: domain specific data
 181  */
 182 struct msi_domain_info {
 183         u32                     flags;
 184         struct msi_domain_ops   *ops;
 185         struct irq_chip         *chip;
 186         void                    *chip_data;
 187         irq_flow_handler_t      handler;
 188         void                    *handler_data;
 189         const char              *handler_name;
 190         void                    *data;
 191 };
 192
 193 /* Flags for msi_domain_info */
 194 enum {
 195         /*
 196          * Init non implemented ops callbacks with default MSI domain
 197          * callbacks.
 198          */
 199         MSI_FLAG_USE_DEF_DOM_OPS        = (1 << 0),
 200         /*
 201          * Init non implemented chip callbacks with default MSI chip
 202          * callbacks.
 203          */
 204         MSI_FLAG_USE_DEF_CHIP_OPS       = (1 << 1),
 205         /* Build identity map between hwirq and irq */
 206         MSI_FLAG_IDENTITY_MAP           = (1 << 2),
 207         /* Support multiple PCI MSI interrupts */
 208         MSI_FLAG_MULTI_PCI_MSI          = (1 << 3),
 209         /* Support PCI MSIX interrupts */
 210         MSI_FLAG_PCI_MSIX               = (1 << 4),
 211 };
 212
 213 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
 214                             bool force);
 215
 216 struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
 217                                          struct msi_domain_info *info,
 218                                          struct irq_domain *parent);
 219 int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 220                           int nvec);
 221 void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
 222 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
 223
 224 #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
 225
 226 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
 227 void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
 228 struct irq_domain *pci_msi_create_irq_domain(struct device_node *node,
 229                                              struct msi_domain_info *info,
 230                                              struct irq_domain *parent);
 231 int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
 232                               int nvec, int type);
 233 void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev);
 234 struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node,
 235                  struct msi_domain_info *info, struct irq_domain *parent);
 236
 237 irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
 238                                           struct msi_desc *desc);
 239 int pci_msi_domain_check_cap(struct irq_domain *domain,
 240                              struct msi_domain_info *info, struct device *dev);
 241 #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
 242
 243 #endif /* LINUX_MSI_H */