LXR linux/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
   8struct 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
  14extern int pci_msi_ignore_mask;
  15/* Helper functions */
  16struct irq_data;
  17struct msi_desc;
  18struct pci_dev;
  19struct platform_msi_priv_data;
  20void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  21#ifdef CONFIG_GENERIC_MSI_IRQ
  22void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
  23#else
  24static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
  25{
  26}
  27#endif
  28
  29typedef 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 */
  37struct 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 */
  46struct 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 */
  72struct 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
 125struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
 126void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
 127void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
 128#else /* CONFIG_PCI_MSI */
 129static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
 130{
 131        return NULL;
 132}
 133static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
 134{
 135}
 136#endif /* CONFIG_PCI_MSI */
 137
 138struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
 139                                 const struct cpumask *affinity);
 140void free_msi_entry(struct msi_desc *entry);
 141void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 142void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 143
 144u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
 145u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
 146void pci_msi_mask_irq(struct irq_data *data);
 147void pci_msi_unmask_irq(struct irq_data *data);
 148
 149/* Conversion helpers. Should be removed after merging */
 150static inline void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
 151{
 152        __pci_write_msi_msg(entry, msg);
 153}
 154static inline void write_msi_msg(int irq, struct msi_msg *msg)
 155{
 156        pci_write_msi_msg(irq, msg);
 157}
 158static inline void mask_msi_irq(struct irq_data *data)
 159{
 160        pci_msi_mask_irq(data);
 161}
 162static 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 */
 172int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
 173void arch_teardown_msi_irq(unsigned int irq);
 174int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
 175void arch_teardown_msi_irqs(struct pci_dev *dev);
 176void arch_restore_msi_irqs(struct pci_dev *dev);
 177
 178void default_teardown_msi_irqs(struct pci_dev *dev);
 179void default_restore_msi_irqs(struct pci_dev *dev);
 180
 181struct 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
 199struct irq_domain;
 200struct irq_domain_ops;
 201struct irq_chip;
 202struct device_node;
 203struct fwnode_handle;
 204struct 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 */
 224struct 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 */
 258struct 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 */
 270enum {
 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
 294int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
 295                            bool force);
 296
 297struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
 298                                         struct msi_domain_info *info,
 299                                         struct irq_domain *parent);
 300int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 301                          int nvec);
 302void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
 303struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
 304
 305struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
 306                                                  struct msi_domain_info *info,
 307                                                  struct irq_domain *parent);
 308int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
 309                                   irq_write_msi_msg_t write_msi_msg);
 310void platform_msi_domain_free_irqs(struct device *dev);
 311
 312/* When an MSI domain is used as an intermediate domain */
 313int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
 314                            int nvec, msi_alloc_info_t *args);
 315int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
 316                             int virq, int nvec, msi_alloc_info_t *args);
 317struct irq_domain *
 318platform_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);
 323int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
 324                              unsigned int nr_irqs);
 325void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
 326                              unsigned int nvec);
 327void *platform_msi_get_host_data(struct irq_domain *domain);
 328#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
 329
 330#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
 331void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
 332struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 333                                             struct msi_domain_info *info,
 334                                             struct irq_domain *parent);
 335irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
 336                                          struct msi_desc *desc);
 337int pci_msi_domain_check_cap(struct irq_domain *domain,
 338                             struct msi_domain_info *info, struct device *dev);
 339u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
 340struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
 341#else
 342static 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 */
 349