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