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 int (*setup_irqs)(struct msi_controller *chip, struct pci_dev *dev, 167 int nvec, int type); 168 void (*teardown_irq)(struct msi_controller *chip, unsigned int irq); 169 }; 170 171 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN 172 173 #include <linux/irqhandler.h> 174 #include <asm/msi.h> 175 176 struct irq_domain; 177 struct irq_chip; 178 struct device_node; 179 struct fwnode_handle; 180 struct msi_domain_info; 181 182 /** 183 * struct msi_domain_ops - MSI interrupt domain callbacks 184 * @get_hwirq: Retrieve the resulting hw irq number 185 * @msi_init: Domain specific init function for MSI interrupts 186 * @msi_free: Domain specific function to free a MSI interrupts 187 * @msi_check: Callback for verification of the domain/info/dev data 188 * @msi_prepare: Prepare the allocation of the interrupts in the domain 189 * @msi_finish: Optional callbacl to finalize the allocation 190 * @set_desc: Set the msi descriptor for an interrupt 191 * @handle_error: Optional error handler if the allocation fails 192 * 193 * @get_hwirq, @msi_init and @msi_free are callbacks used by 194 * msi_create_irq_domain() and related interfaces 195 * 196 * @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error 197 * are callbacks used by msi_irq_domain_alloc_irqs() and related 198 * interfaces which are based on msi_desc. 199 */ 200 struct msi_domain_ops { 201 irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info, 202 msi_alloc_info_t *arg); 203 int (*msi_init)(struct irq_domain *domain, 204 struct msi_domain_info *info, 205 unsigned int virq, irq_hw_number_t hwirq, 206 msi_alloc_info_t *arg); 207 void (*msi_free)(struct irq_domain *domain, 208 struct msi_domain_info *info, 209 unsigned int virq); 210 int (*msi_check)(struct irq_domain *domain, 211 struct msi_domain_info *info, 212 struct device *dev); 213 int (*msi_prepare)(struct irq_domain *domain, 214 struct device *dev, int nvec, 215 msi_alloc_info_t *arg); 216 void (*msi_finish)(msi_alloc_info_t *arg, int retval); 217 void (*set_desc)(msi_alloc_info_t *arg, 218 struct msi_desc *desc); 219 int (*handle_error)(struct irq_domain *domain, 220 struct msi_desc *desc, int error); 221 }; 222 223 /** 224 * struct msi_domain_info - MSI interrupt domain data 225 * @flags: Flags to decribe features and capabilities 226 * @ops: The callback data structure 227 * @chip: Optional: associated interrupt chip 228 * @chip_data: Optional: associated interrupt chip data 229 * @handler: Optional: associated interrupt flow handler 230 * @handler_data: Optional: associated interrupt flow handler data 231 * @handler_name: Optional: associated interrupt flow handler name 232 * @data: Optional: domain specific data 233 */ 234 struct msi_domain_info { 235 u32 flags; 236 struct msi_domain_ops *ops; 237 struct irq_chip *chip; 238 void *chip_data; 239 irq_flow_handler_t handler; 240 void *handler_data; 241 const char *handler_name; 242 void *data; 243 }; 244 245 /* Flags for msi_domain_info */ 246 enum { 247 /* 248 * Init non implemented ops callbacks with default MSI domain 249 * callbacks. 250 */ 251 MSI_FLAG_USE_DEF_DOM_OPS = (1 << 0), 252 /* 253 * Init non implemented chip callbacks with default MSI chip 254 * callbacks. 255 */ 256 MSI_FLAG_USE_DEF_CHIP_OPS = (1 << 1), 257 /* Build identity map between hwirq and irq */ 258 MSI_FLAG_IDENTITY_MAP = (1 << 2), 259 /* Support multiple PCI MSI interrupts */ 260 MSI_FLAG_MULTI_PCI_MSI = (1 << 3), 261 /* Support PCI MSIX interrupts */ 262 MSI_FLAG_PCI_MSIX = (1 << 4), 263 }; 264 265 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask, 266 bool force); 267 268 struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode, 269 struct msi_domain_info *info, 270 struct irq_domain *parent); 271 int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, 272 int nvec); 273 void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev); 274 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain); 275 276 struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode, 277 struct msi_domain_info *info, 278 struct irq_domain *parent); 279 int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec, 280 irq_write_msi_msg_t write_msi_msg); 281 void platform_msi_domain_free_irqs(struct device *dev); 282 #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */ 283 284 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN 285 void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg); 286 struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode, 287 struct msi_domain_info *info, 288 struct irq_domain *parent); 289 int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev, 290 int nvec, int type); 291 void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev); 292 struct irq_domain *pci_msi_create_default_irq_domain(struct fwnode_handle *fwnode, 293 struct msi_domain_info *info, struct irq_domain *parent); 294 295 irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev, 296 struct msi_desc *desc); 297 int pci_msi_domain_check_cap(struct irq_domain *domain, 298 struct msi_domain_info *info, struct device *dev); 299 u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev); 300 struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev); 301 #else 302 static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev) 303 { 304 return NULL; 305 } 306 #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */ 307 308 #endif /* LINUX_MSI_H */ 309