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/sclp.h> 13 14 #define PCIBIOS_MIN_IO 0x1000 15 #define PCIBIOS_MIN_MEM 0x10000000 16 17 #define pcibios_assign_all_busses() (0) 18 19 void __iomem *pci_iomap(struct pci_dev *, int, unsigned long); 20 void pci_iounmap(struct pci_dev *, void __iomem *); 21 int pci_domain_nr(struct pci_bus *); 22 int pci_proc_domain(struct pci_bus *); 23 24 #define ZPCI_BUS_NR 0 /* default bus number */ 25 26 #define ZPCI_NR_DMA_SPACES 1 27 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS 28 #define ZPCI_DOMAIN_BITMAP_SIZE (1 << 16) 29 30 #ifdef PCI 31 #if (ZPCI_NR_DEVICES > ZPCI_DOMAIN_BITMAP_SIZE) 32 # error ZPCI_NR_DEVICES can not be bigger than ZPCI_DOMAIN_BITMAP_SIZE 33 #endif 34 #endif /* PCI */ 35 36 /* PCI Function Controls */ 37 #define ZPCI_FC_FN_ENABLED 0x80 38 #define ZPCI_FC_ERROR 0x40 39 #define ZPCI_FC_BLOCKED 0x20 40 #define ZPCI_FC_DMA_ENABLED 0x10 41 42 #define ZPCI_FMB_DMA_COUNTER_VALID (1 << 23) 43 44 struct zpci_fmb_fmt0 { 45 u64 dma_rbytes; 46 u64 dma_wbytes; 47 }; 48 49 struct zpci_fmb_fmt1 { 50 u64 rx_bytes; 51 u64 rx_packets; 52 u64 tx_bytes; 53 u64 tx_packets; 54 }; 55 56 struct zpci_fmb_fmt2 { 57 u64 consumed_work_units; 58 u64 max_work_units; 59 }; 60 61 struct zpci_fmb_fmt3 { 62 u64 tx_bytes; 63 }; 64 65 struct zpci_fmb { 66 u32 format : 8; 67 u32 fmt_ind : 24; 68 u32 samples; 69 u64 last_update; 70 /* common counters */ 71 u64 ld_ops; 72 u64 st_ops; 73 u64 stb_ops; 74 u64 rpcit_ops; 75 /* format specific counters */ 76 union { 77 struct zpci_fmb_fmt0 fmt0; 78 struct zpci_fmb_fmt1 fmt1; 79 struct zpci_fmb_fmt2 fmt2; 80 struct zpci_fmb_fmt3 fmt3; 81 }; 82 } __packed __aligned(128); 83 84 enum zpci_state { 85 ZPCI_FN_STATE_STANDBY = 0, 86 ZPCI_FN_STATE_CONFIGURED = 1, 87 ZPCI_FN_STATE_RESERVED = 2, 88 }; 89 90 struct zpci_bar_struct { 91 struct resource *res; /* bus resource */ 92 void __iomem *mio_wb; 93 void __iomem *mio_wt; 94 u32 val; /* bar start & 3 flag bits */ 95 u16 map_idx; /* index into bar mapping array */ 96 u8 size; /* order 2 exponent */ 97 }; 98 99 struct s390_domain; 100 101 #define ZPCI_FUNCTIONS_PER_BUS 256 102 struct zpci_bus { 103 struct kref kref; 104 struct pci_bus *bus; 105 struct zpci_dev *function[ZPCI_FUNCTIONS_PER_BUS]; 106 struct list_head resources; 107 struct list_head bus_next; 108 struct resource bus_resource; 109 int pchid; 110 int domain_nr; 111 bool multifunction; 112 enum pci_bus_speed max_bus_speed; 113 }; 114 115 /* Private data per function */ 116 struct zpci_dev { 117 struct zpci_bus *zbus; 118 struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */ 119 struct list_head bus_next; 120 struct kref kref; 121 struct hotplug_slot hotplug_slot; 122 123 enum zpci_state state; 124 u32 fid; /* function ID, used by sclp */ 125 u32 fh; /* function handle, used by insn's */ 126 u32 gisa; /* GISA designation for passthrough */ 127 u16 vfn; /* virtual function number */ 128 u16 pchid; /* physical channel ID */ 129 u16 maxstbl; /* Maximum store block size */ 130 u8 pfgid; /* function group ID */ 131 u8 pft; /* pci function type */ 132 u8 port; 133 u8 dtsm; /* Supported DT mask */ 134 u8 rid_available : 1; 135 u8 has_hp_slot : 1; 136 u8 has_resources : 1; 137 u8 is_physfn : 1; 138 u8 util_str_avail : 1; 139 u8 irqs_registered : 1; 140 u8 reserved : 2; 141 unsigned int devfn; /* DEVFN part of the RID*/ 142 143 struct mutex lock; 144 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */ 145 u32 uid; /* user defined id */ 146 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */ 147 148 /* IRQ stuff */ 149 u64 msi_addr; /* MSI address */ 150 unsigned int max_msi; /* maximum number of MSI's */ 151 unsigned int msi_first_bit; 152 unsigned int msi_nr_irqs; 153 struct airq_iv *aibv; /* adapter interrupt bit vector */ 154 unsigned long aisb; /* number of the summary bit */ 155 156 /* DMA stuff */ 157 unsigned long *dma_table; 158 spinlock_t dma_table_lock; 159 int tlb_refresh; 160 161 spinlock_t iommu_bitmap_lock; 162 unsigned long *iommu_bitmap; 163 unsigned long *lazy_bitmap; 164 unsigned long iommu_size; 165 unsigned long iommu_pages; 166 unsigned int next_bit; 167 168 struct iommu_device iommu_dev; /* IOMMU core handle */ 169 170 char res_name[16]; 171 bool mio_capable; 172 struct zpci_bar_struct bars[PCI_STD_NUM_BARS]; 173 174 u64 start_dma; /* Start of available DMA addresses */ 175 u64 end_dma; /* End of available DMA addresses */ 176 u64 dma_mask; /* DMA address space mask */ 177 178 /* Function measurement block */ 179 struct zpci_fmb *fmb; 180 u16 fmb_update; /* update interval */ 181 u16 fmb_length; 182 /* software counters */ 183 atomic64_t allocated_pages; 184 atomic64_t mapped_pages; 185 atomic64_t unmapped_pages; 186 187 u8 version; 188 enum pci_bus_speed max_bus_speed; 189 190 struct dentry *debugfs_dev; 191 192 struct s390_domain *s390_domain; /* s390 IOMMU domain data */ 193 }; 194 195 static inline bool zdev_enabled(struct zpci_dev *zdev) 196 { 197 return (zdev->fh & (1UL << 31)) ? true : false; 198 } 199 200 extern const struct attribute_group *zpci_attr_groups[]; 201 extern unsigned int s390_pci_force_floating __initdata; 202 extern unsigned int s390_pci_no_rid; 203 204 /* ----------------------------------------------------------------------------- 205 Prototypes 206 ----------------------------------------------------------------------------- */ 207 /* Base stuff */ 208 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state); 209 int zpci_enable_device(struct zpci_dev *); 210 int zpci_disable_device(struct zpci_dev *); 211 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh); 212 int zpci_deconfigure_device(struct zpci_dev *zdev); 213 void zpci_device_reserved(struct zpci_dev *zdev); 214 bool zpci_is_device_configured(struct zpci_dev *zdev); 215 216 int zpci_hot_reset_device(struct zpci_dev *zdev); 217 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64); 218 int zpci_unregister_ioat(struct zpci_dev *, u8); 219 void zpci_remove_reserved_devices(void); 220 void zpci_update_fh(struct zpci_dev *zdev, u32 fh); 221 222 /* CLP */ 223 int clp_setup_writeback_mio(void); 224 int clp_scan_pci_devices(void); 225 int clp_query_pci_fn(struct zpci_dev *zdev); 226 int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as); 227 int clp_disable_fh(struct zpci_dev *zdev, u32 *fh); 228 int clp_get_state(u32 fid, enum zpci_state *state); 229 int clp_refresh_fh(u32 fid, u32 *fh); 230 231 /* UID */ 232 void update_uid_checking(bool new); 233 234 /* IOMMU Interface */ 235 int zpci_init_iommu(struct zpci_dev *zdev); 236 void zpci_destroy_iommu(struct zpci_dev *zdev); 237 238 #ifdef CONFIG_PCI 239 static inline bool zpci_use_mio(struct zpci_dev *zdev) 240 { 241 return static_branch_likely(&have_mio) && zdev->mio_capable; 242 } 243 244 /* Error handling and recovery */ 245 void zpci_event_error(void *); 246 void zpci_event_availability(void *); 247 bool zpci_is_enabled(void); 248 #else /* CONFIG_PCI */ 249 static inline void zpci_event_error(void *e) {} 250 static inline void zpci_event_availability(void *e) {} 251 #endif /* CONFIG_PCI */ 252 253 #ifdef CONFIG_HOTPLUG_PCI_S390 254 int zpci_init_slot(struct zpci_dev *); 255 void zpci_exit_slot(struct zpci_dev *); 256 #else /* CONFIG_HOTPLUG_PCI_S390 */ 257 static inline int zpci_init_slot(struct zpci_dev *zdev) 258 { 259 return 0; 260 } 261 static inline void zpci_exit_slot(struct zpci_dev *zdev) {} 262 #endif /* CONFIG_HOTPLUG_PCI_S390 */ 263 264 /* Helpers */ 265 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev) 266 { 267 struct zpci_bus *zbus = pdev->sysdata; 268 269 return zbus->function[pdev->devfn]; 270 } 271 272 static inline struct zpci_dev *to_zpci_dev(struct device *dev) 273 { 274 return to_zpci(to_pci_dev(dev)); 275 } 276 277 struct zpci_dev *get_zdev_by_fid(u32); 278 279 /* DMA */ 280 int zpci_dma_init(void); 281 void zpci_dma_exit(void); 282 int zpci_dma_init_device(struct zpci_dev *zdev); 283 int zpci_dma_exit_device(struct zpci_dev *zdev); 284 285 /* IRQ */ 286 int __init zpci_irq_init(void); 287 void __init zpci_irq_exit(void); 288 289 /* FMB */ 290 int zpci_fmb_enable_device(struct zpci_dev *); 291 int zpci_fmb_disable_device(struct zpci_dev *); 292 293 /* Debug */ 294 int zpci_debug_init(void); 295 void zpci_debug_exit(void); 296 void zpci_debug_init_device(struct zpci_dev *, const char *); 297 void zpci_debug_exit_device(struct zpci_dev *); 298 299 /* Error handling */ 300 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *); 301 int zpci_clear_error_state(struct zpci_dev *zdev); 302 int zpci_reset_load_store_blocked(struct zpci_dev *zdev); 303 304 #ifdef CONFIG_NUMA 305 306 /* Returns the node based on PCI bus */ 307 static inline int __pcibus_to_node(const struct pci_bus *bus) 308 { 309 return NUMA_NO_NODE; 310 } 311 312 static inline const struct cpumask * 313 cpumask_of_pcibus(const struct pci_bus *bus) 314 { 315 return cpu_online_mask; 316 } 317 318 #endif /* CONFIG_NUMA */ 319 320 #endif 321