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