1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_S390_PCI_H 3 #define __ASM_S390_PCI_H 4 5 #include <linux/pci.h> 6 #include <linux/mutex.h> 7 #include <linux/iommu.h> 8 #include <linux/irqdomain.h> 9 #include <linux/pci_hotplug.h> 10 #include <asm/pci_clp.h> 11 #include <asm/pci_debug.h> 12 #include <asm/pci_insn.h> 13 #include <asm/sclp.h> 14 15 #define ARCH_GENERIC_PCI_MMAP_RESOURCE 1 16 #define arch_can_pci_mmap_wc() 1 17 18 #define PCIBIOS_MIN_IO 0x1000 19 #define PCIBIOS_MIN_MEM 0x10000000 20 21 #define pcibios_assign_all_busses() (0) 22 23 void __iomem *pci_iomap(struct pci_dev *, int, unsigned long); 24 void pci_iounmap(struct pci_dev *, void __iomem *); 25 int pci_domain_nr(struct pci_bus *); 26 int pci_proc_domain(struct pci_bus *); 27 28 #define ZPCI_BUS_NR 0 /* default bus number */ 29 30 #define ZPCI_NR_DMA_SPACES 1 31 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS 32 #define ZPCI_DOMAIN_BITMAP_SIZE (1 << 16) 33 34 #ifdef PCI 35 #if (ZPCI_NR_DEVICES > ZPCI_DOMAIN_BITMAP_SIZE) 36 # error ZPCI_NR_DEVICES can not be bigger than ZPCI_DOMAIN_BITMAP_SIZE 37 #endif 38 #endif /* PCI */ 39 40 /* PCI Function Controls */ 41 #define ZPCI_FC_FN_ENABLED 0x80 42 #define ZPCI_FC_ERROR 0x40 43 #define ZPCI_FC_BLOCKED 0x20 44 #define ZPCI_FC_DMA_ENABLED 0x10 45 46 #define ZPCI_FMB_DMA_COUNTER_VALID (1 << 23) 47 48 struct zpci_fmb_fmt0 { 49 u64 dma_rbytes; 50 u64 dma_wbytes; 51 }; 52 53 struct zpci_fmb_fmt1 { 54 u64 rx_bytes; 55 u64 rx_packets; 56 u64 tx_bytes; 57 u64 tx_packets; 58 }; 59 60 struct zpci_fmb_fmt2 { 61 u64 consumed_work_units; 62 u64 max_work_units; 63 }; 64 65 struct zpci_fmb_fmt3 { 66 u64 tx_bytes; 67 }; 68 69 struct zpci_fmb { 70 u32 format : 8; 71 u32 fmt_ind : 24; 72 u32 samples; 73 u64 last_update; 74 /* common counters */ 75 u64 ld_ops; 76 u64 st_ops; 77 u64 stb_ops; 78 u64 rpcit_ops; 79 /* format specific counters */ 80 union { 81 struct zpci_fmb_fmt0 fmt0; 82 struct zpci_fmb_fmt1 fmt1; 83 struct zpci_fmb_fmt2 fmt2; 84 struct zpci_fmb_fmt3 fmt3; 85 }; 86 } __packed __aligned(128); 87 88 enum zpci_state { 89 ZPCI_FN_STATE_STANDBY = 0, 90 ZPCI_FN_STATE_CONFIGURED = 1, 91 ZPCI_FN_STATE_RESERVED = 2, 92 }; 93 94 struct zpci_bar_struct { 95 struct resource *res; /* bus resource */ 96 void __iomem *mio_wb; 97 void __iomem *mio_wt; 98 u32 val; /* bar start & 3 flag bits */ 99 u16 map_idx; /* index into bar mapping array */ 100 u8 size; /* order 2 exponent */ 101 }; 102 103 struct kvm_zdev; 104 105 #define ZPCI_FUNCTIONS_PER_BUS 256 106 struct zpci_bus { 107 struct kref kref; 108 struct pci_bus *bus; 109 struct zpci_dev *function[ZPCI_FUNCTIONS_PER_BUS]; 110 struct list_head resources; 111 struct list_head bus_next; 112 struct resource bus_resource; 113 struct irq_domain *msi_parent_domain; 114 int topo; /* TID if topo_is_tid, PCHID otherwise */ 115 int domain_nr; 116 u8 multifunction : 1; 117 u8 topo_is_tid : 1; 118 enum pci_bus_speed max_bus_speed; 119 }; 120 121 /* Private data per function */ 122 struct zpci_dev { 123 struct zpci_bus *zbus; 124 struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */ 125 struct list_head iommu_list; 126 struct kref kref; 127 struct rcu_head rcu; 128 struct hotplug_slot hotplug_slot; 129 130 struct mutex state_lock; /* protect state changes */ 131 enum zpci_state state; 132 u32 fid; /* function ID, used by sclp */ 133 u32 fh; /* function handle, used by insn's */ 134 u32 gisa; /* GISA designation for passthrough */ 135 u16 vfn; /* virtual function number */ 136 u16 pchid; /* physical channel ID */ 137 u16 maxstbl; /* Maximum store block size */ 138 u16 rid; /* RID as supplied by firmware */ 139 u16 tid; /* Topology for which RID is valid */ 140 u8 pfgid; /* function group ID */ 141 u8 pft; /* pci function type */ 142 u8 port; 143 u8 fidparm; 144 u8 dtsm; /* Supported DT mask */ 145 u8 rid_available : 1; 146 u8 has_hp_slot : 1; 147 u8 has_resources : 1; 148 u8 is_physfn : 1; 149 u8 util_str_avail : 1; 150 u8 tid_avail : 1; 151 u8 rtr_avail : 1; /* Relaxed translation allowed */ 152 unsigned int devfn; /* DEVFN part of the RID*/ 153 154 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */ 155 u32 uid; /* user defined id */ 156 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */ 157 158 /* IRQ stuff */ 159 u64 msi_addr; /* MSI address */ 160 unsigned int max_msi; /* maximum number of MSI's */ 161 unsigned int msi_first_bit; 162 unsigned int msi_nr_irqs; 163 struct airq_iv *aibv; /* adapter interrupt bit vector */ 164 unsigned long aisb; /* number of the summary bit */ 165 166 /* DMA stuff */ 167 unsigned long *dma_table; 168 int tlb_refresh; 169 170 struct iommu_device iommu_dev; /* IOMMU core handle */ 171 172 char res_name[16]; 173 bool mio_capable; 174 struct zpci_bar_struct bars[PCI_STD_NUM_BARS]; 175 176 u64 start_dma; /* Start of available DMA addresses */ 177 u64 end_dma; /* End of available DMA addresses */ 178 u64 dma_mask; /* DMA address space mask */ 179 180 /* Function measurement block */ 181 struct mutex fmb_lock; 182 struct zpci_fmb *fmb; 183 u16 fmb_update; /* update interval */ 184 u16 fmb_length; 185 186 u8 version; 187 enum pci_bus_speed max_bus_speed; 188 189 struct dentry *debugfs_dev; 190 191 /* IOMMU and passthrough */ 192 struct iommu_domain *s390_domain; /* attached IOMMU domain */ 193 struct kvm_zdev *kzdev; 194 struct mutex kzdev_lock; 195 spinlock_t dom_lock; /* protect s390_domain change */ 196 }; 197 198 static inline bool zdev_enabled(struct zpci_dev *zdev) 199 { 200 return (zdev->fh & (1UL << 31)) ? true : false; 201 } 202 203 extern const struct attribute_group zpci_attr_group; 204 extern const struct attribute_group pfip_attr_group; 205 extern const struct attribute_group zpci_ident_attr_group; 206 207 #define ARCH_PCI_DEV_GROUPS &zpci_attr_group, \ 208 &pfip_attr_group, \ 209 &zpci_ident_attr_group, 210 211 extern const struct attribute_group zpci_slot_attr_group; 212 213 #define ARCH_PCI_SLOT_GROUPS (&zpci_slot_attr_group) 214 215 extern unsigned int s390_pci_force_floating __initdata; 216 extern unsigned int s390_pci_no_rid; 217 218 extern union zpci_sic_iib *zpci_aipb; 219 extern struct airq_iv *zpci_aif_sbv; 220 221 /* ----------------------------------------------------------------------------- 222 Prototypes 223 ----------------------------------------------------------------------------- */ 224 /* Base stuff */ 225 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state); 226 int zpci_add_device(struct zpci_dev *zdev); 227 int zpci_enable_device(struct zpci_dev *); 228 int zpci_reenable_device(struct zpci_dev *zdev); 229 int zpci_disable_device(struct zpci_dev *); 230 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh); 231 int zpci_deconfigure_device(struct zpci_dev *zdev); 232 void zpci_device_reserved(struct zpci_dev *zdev); 233 bool zpci_is_device_configured(struct zpci_dev *zdev); 234 int zpci_scan_devices(void); 235 236 int zpci_hot_reset_device(struct zpci_dev *zdev); 237 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64, u8 *); 238 int zpci_unregister_ioat(struct zpci_dev *, u8); 239 void zpci_remove_reserved_devices(void); 240 void zpci_update_fh(struct zpci_dev *zdev, u32 fh); 241 242 /* CLP */ 243 int clp_setup_writeback_mio(void); 244 int clp_scan_pci_devices(struct list_head *scan_list); 245 int clp_query_pci_fn(struct zpci_dev *zdev); 246 int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as); 247 int clp_disable_fh(struct zpci_dev *zdev, u32 *fh); 248 int clp_get_state(u32 fid, enum zpci_state *state); 249 int clp_refresh_fh(u32 fid, u32 *fh); 250 251 /* UID */ 252 void update_uid_checking(bool new); 253 254 /* Firmware Sysfs */ 255 int __init __zpci_fw_sysfs_init(void); 256 257 static inline int __init zpci_fw_sysfs_init(void) 258 { 259 if (IS_ENABLED(CONFIG_SYSFS)) 260 return __zpci_fw_sysfs_init(); 261 return 0; 262 } 263 264 /* IOMMU Interface */ 265 int zpci_init_iommu(struct zpci_dev *zdev); 266 void zpci_destroy_iommu(struct zpci_dev *zdev); 267 int zpci_iommu_register_ioat(struct zpci_dev *zdev, u8 *status); 268 269 #ifdef CONFIG_PCI 270 static inline bool zpci_use_mio(struct zpci_dev *zdev) 271 { 272 return static_branch_likely(&have_mio) && zdev->mio_capable; 273 } 274 275 /* Error handling and recovery */ 276 void zpci_event_error(void *); 277 void zpci_event_availability(void *); 278 bool zpci_is_enabled(void); 279 #else /* CONFIG_PCI */ 280 static inline void zpci_event_error(void *e) {} 281 static inline void zpci_event_availability(void *e) {} 282 #endif /* CONFIG_PCI */ 283 284 #ifdef CONFIG_HOTPLUG_PCI_S390 285 int zpci_init_slot(struct zpci_dev *); 286 void zpci_exit_slot(struct zpci_dev *); 287 #else /* CONFIG_HOTPLUG_PCI_S390 */ 288 static inline int zpci_init_slot(struct zpci_dev *zdev) 289 { 290 return 0; 291 } 292 static inline void zpci_exit_slot(struct zpci_dev *zdev) {} 293 #endif /* CONFIG_HOTPLUG_PCI_S390 */ 294 295 /* Helpers */ 296 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev) 297 { 298 struct zpci_bus *zbus = pdev->sysdata; 299 300 return zbus->function[pdev->devfn]; 301 } 302 303 static inline struct zpci_dev *to_zpci_dev(struct device *dev) 304 { 305 return to_zpci(to_pci_dev(dev)); 306 } 307 308 struct zpci_dev *get_zdev_by_fid(u32); 309 310 /* DMA */ 311 int zpci_dma_init(void); 312 void zpci_dma_exit(void); 313 int zpci_dma_init_device(struct zpci_dev *zdev); 314 int zpci_dma_exit_device(struct zpci_dev *zdev); 315 316 /* IRQ */ 317 int __init zpci_irq_init(void); 318 void __init zpci_irq_exit(void); 319 int zpci_set_irq(struct zpci_dev *zdev); 320 int zpci_create_parent_msi_domain(struct zpci_bus *zbus); 321 void zpci_remove_parent_msi_domain(struct zpci_bus *zbus); 322 323 /* FMB */ 324 int zpci_fmb_enable_device(struct zpci_dev *); 325 int zpci_fmb_disable_device(struct zpci_dev *); 326 327 /* Debug */ 328 int zpci_debug_init(void); 329 void zpci_debug_exit(void); 330 void zpci_debug_init_device(struct zpci_dev *, const char *); 331 void zpci_debug_exit_device(struct zpci_dev *); 332 333 /* Error handling */ 334 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *); 335 int zpci_clear_error_state(struct zpci_dev *zdev); 336 int zpci_reset_load_store_blocked(struct zpci_dev *zdev); 337 338 #ifdef CONFIG_NUMA 339 340 /* Returns the node based on PCI bus */ 341 static inline int __pcibus_to_node(const struct pci_bus *bus) 342 { 343 return NUMA_NO_NODE; 344 } 345 346 static inline const struct cpumask * 347 cpumask_of_pcibus(const struct pci_bus *bus) 348 { 349 return cpu_online_mask; 350 } 351 352 #endif /* CONFIG_NUMA */ 353 354 #endif 355