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-generic/pci.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 PCIBIOS_MIN_IO 0x1000 16 #define PCIBIOS_MIN_MEM 0x10000000 17 18 #define pcibios_assign_all_busses() (0) 19 20 void __iomem *pci_iomap(struct pci_dev *, int, unsigned long); 21 void pci_iounmap(struct pci_dev *, void __iomem *); 22 int pci_domain_nr(struct pci_bus *); 23 int pci_proc_domain(struct pci_bus *); 24 25 #define ZPCI_BUS_NR 0 /* default bus number */ 26 27 #define ZPCI_NR_DMA_SPACES 1 28 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS 29 #define ZPCI_DOMAIN_BITMAP_SIZE (1 << 16) 30 31 #ifdef PCI 32 #if (ZPCI_NR_DEVICES > ZPCI_DOMAIN_BITMAP_SIZE) 33 # error ZPCI_NR_DEVICES can not be bigger than ZPCI_DOMAIN_BITMAP_SIZE 34 #endif 35 #endif /* PCI */ 36 37 /* PCI Function Controls */ 38 #define ZPCI_FC_FN_ENABLED 0x80 39 #define ZPCI_FC_ERROR 0x40 40 #define ZPCI_FC_BLOCKED 0x20 41 #define ZPCI_FC_DMA_ENABLED 0x10 42 43 #define ZPCI_FMB_DMA_COUNTER_VALID (1 << 23) 44 45 struct zpci_fmb_fmt0 { 46 u64 dma_rbytes; 47 u64 dma_wbytes; 48 }; 49 50 struct zpci_fmb_fmt1 { 51 u64 rx_bytes; 52 u64 rx_packets; 53 u64 tx_bytes; 54 u64 tx_packets; 55 }; 56 57 struct zpci_fmb_fmt2 { 58 u64 consumed_work_units; 59 u64 max_work_units; 60 }; 61 62 struct zpci_fmb_fmt3 { 63 u64 tx_bytes; 64 }; 65 66 struct zpci_fmb { 67 u32 format : 8; 68 u32 fmt_ind : 24; 69 u32 samples; 70 u64 last_update; 71 /* common counters */ 72 u64 ld_ops; 73 u64 st_ops; 74 u64 stb_ops; 75 u64 rpcit_ops; 76 /* format specific counters */ 77 union { 78 struct zpci_fmb_fmt0 fmt0; 79 struct zpci_fmb_fmt1 fmt1; 80 struct zpci_fmb_fmt2 fmt2; 81 struct zpci_fmb_fmt3 fmt3; 82 }; 83 } __packed __aligned(128); 84 85 enum zpci_state { 86 ZPCI_FN_STATE_STANDBY = 0, 87 ZPCI_FN_STATE_CONFIGURED = 1, 88 ZPCI_FN_STATE_RESERVED = 2, 89 }; 90 91 struct zpci_bar_struct { 92 struct resource *res; /* bus resource */ 93 void __iomem *mio_wb; 94 void __iomem *mio_wt; 95 u32 val; /* bar start & 3 flag bits */ 96 u16 map_idx; /* index into bar mapping array */ 97 u8 size; /* order 2 exponent */ 98 }; 99 100 struct s390_domain; 101 struct kvm_zdev; 102 103 #define ZPCI_FUNCTIONS_PER_BUS 256 104 struct zpci_bus { 105 struct kref kref; 106 struct pci_bus *bus; 107 struct zpci_dev *function[ZPCI_FUNCTIONS_PER_BUS]; 108 struct list_head resources; 109 struct list_head bus_next; 110 struct resource bus_resource; 111 int pchid; 112 int domain_nr; 113 bool multifunction; 114 enum pci_bus_speed max_bus_speed; 115 }; 116 117 /* Private data per function */ 118 struct zpci_dev { 119 struct zpci_bus *zbus; 120 struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */ 121 struct list_head bus_next; 122 struct kref kref; 123 struct hotplug_slot hotplug_slot; 124 125 enum zpci_state state; 126 u32 fid; /* function ID, used by sclp */ 127 u32 fh; /* function handle, used by insn's */ 128 u32 gisa; /* GISA designation for passthrough */ 129 u16 vfn; /* virtual function number */ 130 u16 pchid; /* physical channel ID */ 131 u16 maxstbl; /* Maximum store block size */ 132 u8 pfgid; /* function group ID */ 133 u8 pft; /* pci function type */ 134 u8 port; 135 u8 dtsm; /* Supported DT mask */ 136 u8 rid_available : 1; 137 u8 has_hp_slot : 1; 138 u8 has_resources : 1; 139 u8 is_physfn : 1; 140 u8 util_str_avail : 1; 141 u8 irqs_registered : 1; 142 u8 reserved : 2; 143 unsigned int devfn; /* DEVFN part of the RID*/ 144 145 struct mutex lock; 146 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */ 147 u32 uid; /* user defined id */ 148 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */ 149 150 /* IRQ stuff */ 151 u64 msi_addr; /* MSI address */ 152 unsigned int max_msi; /* maximum number of MSI's */ 153 unsigned int msi_first_bit; 154 unsigned int msi_nr_irqs; 155 struct airq_iv *aibv; /* adapter interrupt bit vector */ 156 unsigned long aisb; /* number of the summary bit */ 157 158 /* DMA stuff */ 159 unsigned long *dma_table; 160 spinlock_t dma_table_lock; 161 int tlb_refresh; 162 163 spinlock_t iommu_bitmap_lock; 164 unsigned long *iommu_bitmap; 165 unsigned long *lazy_bitmap; 166 unsigned long iommu_size; 167 unsigned long iommu_pages; 168 unsigned int next_bit; 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 zpci_fmb *fmb; 182 u16 fmb_update; /* update interval */ 183 u16 fmb_length; 184 /* software counters */ 185 atomic64_t allocated_pages; 186 atomic64_t mapped_pages; 187 atomic64_t unmapped_pages; 188 189 u8 version; 190 enum pci_bus_speed max_bus_speed; 191 192 struct dentry *debugfs_dev; 193 194 /* IOMMU and passthrough */ 195 struct s390_domain *s390_domain; /* s390 IOMMU domain data */ 196 struct kvm_zdev *kzdev; 197 struct mutex kzdev_lock; 198 }; 199 200 static inline bool zdev_enabled(struct zpci_dev *zdev) 201 { 202 return (zdev->fh & (1UL << 31)) ? true : false; 203 } 204 205 extern const struct attribute_group *zpci_attr_groups[]; 206 extern unsigned int s390_pci_force_floating __initdata; 207 extern unsigned int s390_pci_no_rid; 208 209 extern union zpci_sic_iib *zpci_aipb; 210 extern struct airq_iv *zpci_aif_sbv; 211 212 /* ----------------------------------------------------------------------------- 213 Prototypes 214 ----------------------------------------------------------------------------- */ 215 /* Base stuff */ 216 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state); 217 int zpci_enable_device(struct zpci_dev *); 218 int zpci_disable_device(struct zpci_dev *); 219 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh); 220 int zpci_deconfigure_device(struct zpci_dev *zdev); 221 void zpci_device_reserved(struct zpci_dev *zdev); 222 bool zpci_is_device_configured(struct zpci_dev *zdev); 223 224 int zpci_hot_reset_device(struct zpci_dev *zdev); 225 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64); 226 int zpci_unregister_ioat(struct zpci_dev *, u8); 227 void zpci_remove_reserved_devices(void); 228 void zpci_update_fh(struct zpci_dev *zdev, u32 fh); 229 230 /* CLP */ 231 int clp_setup_writeback_mio(void); 232 int clp_scan_pci_devices(void); 233 int clp_query_pci_fn(struct zpci_dev *zdev); 234 int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as); 235 int clp_disable_fh(struct zpci_dev *zdev, u32 *fh); 236 int clp_get_state(u32 fid, enum zpci_state *state); 237 int clp_refresh_fh(u32 fid, u32 *fh); 238 239 /* UID */ 240 void update_uid_checking(bool new); 241 242 /* IOMMU Interface */ 243 int zpci_init_iommu(struct zpci_dev *zdev); 244 void zpci_destroy_iommu(struct zpci_dev *zdev); 245 246 #ifdef CONFIG_PCI 247 static inline bool zpci_use_mio(struct zpci_dev *zdev) 248 { 249 return static_branch_likely(&have_mio) && zdev->mio_capable; 250 } 251 252 /* Error handling and recovery */ 253 void zpci_event_error(void *); 254 void zpci_event_availability(void *); 255 bool zpci_is_enabled(void); 256 #else /* CONFIG_PCI */ 257 static inline void zpci_event_error(void *e) {} 258 static inline void zpci_event_availability(void *e) {} 259 #endif /* CONFIG_PCI */ 260 261 #ifdef CONFIG_HOTPLUG_PCI_S390 262 int zpci_init_slot(struct zpci_dev *); 263 void zpci_exit_slot(struct zpci_dev *); 264 #else /* CONFIG_HOTPLUG_PCI_S390 */ 265 static inline int zpci_init_slot(struct zpci_dev *zdev) 266 { 267 return 0; 268 } 269 static inline void zpci_exit_slot(struct zpci_dev *zdev) {} 270 #endif /* CONFIG_HOTPLUG_PCI_S390 */ 271 272 /* Helpers */ 273 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev) 274 { 275 struct zpci_bus *zbus = pdev->sysdata; 276 277 return zbus->function[pdev->devfn]; 278 } 279 280 static inline struct zpci_dev *to_zpci_dev(struct device *dev) 281 { 282 return to_zpci(to_pci_dev(dev)); 283 } 284 285 struct zpci_dev *get_zdev_by_fid(u32); 286 287 /* DMA */ 288 int zpci_dma_init(void); 289 void zpci_dma_exit(void); 290 int zpci_dma_init_device(struct zpci_dev *zdev); 291 int zpci_dma_exit_device(struct zpci_dev *zdev); 292 293 /* IRQ */ 294 int __init zpci_irq_init(void); 295 void __init zpci_irq_exit(void); 296 297 /* FMB */ 298 int zpci_fmb_enable_device(struct zpci_dev *); 299 int zpci_fmb_disable_device(struct zpci_dev *); 300 301 /* Debug */ 302 int zpci_debug_init(void); 303 void zpci_debug_exit(void); 304 void zpci_debug_init_device(struct zpci_dev *, const char *); 305 void zpci_debug_exit_device(struct zpci_dev *); 306 307 /* Error handling */ 308 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *); 309 int zpci_clear_error_state(struct zpci_dev *zdev); 310 int zpci_reset_load_store_blocked(struct zpci_dev *zdev); 311 312 #ifdef CONFIG_NUMA 313 314 /* Returns the node based on PCI bus */ 315 static inline int __pcibus_to_node(const struct pci_bus *bus) 316 { 317 return NUMA_NO_NODE; 318 } 319 320 static inline const struct cpumask * 321 cpumask_of_pcibus(const struct pci_bus *bus) 322 { 323 return cpu_online_mask; 324 } 325 326 #endif /* CONFIG_NUMA */ 327 328 #endif 329