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/sclp.h> 12 13 #define PCIBIOS_MIN_IO 0x1000 14 #define PCIBIOS_MIN_MEM 0x10000000 15 16 #define pcibios_assign_all_busses() (0) 17 18 void __iomem *pci_iomap(struct pci_dev *, int, unsigned long); 19 void pci_iounmap(struct pci_dev *, void __iomem *); 20 int pci_domain_nr(struct pci_bus *); 21 int pci_proc_domain(struct pci_bus *); 22 23 #define ZPCI_BUS_NR 0 /* default bus number */ 24 25 #define ZPCI_NR_DMA_SPACES 1 26 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS 27 #define ZPCI_DOMAIN_BITMAP_SIZE (1 << 16) 28 29 #ifdef PCI 30 #if (ZPCI_NR_DEVICES > ZPCI_DOMAIN_BITMAP_SIZE) 31 # error ZPCI_NR_DEVICES can not be bigger than ZPCI_DOMAIN_BITMAP_SIZE 32 #endif 33 #endif /* PCI */ 34 35 /* PCI Function Controls */ 36 #define ZPCI_FC_FN_ENABLED 0x80 37 #define ZPCI_FC_ERROR 0x40 38 #define ZPCI_FC_BLOCKED 0x20 39 #define ZPCI_FC_DMA_ENABLED 0x10 40 41 #define ZPCI_FMB_DMA_COUNTER_VALID (1 << 23) 42 43 struct zpci_fmb_fmt0 { 44 u64 dma_rbytes; 45 u64 dma_wbytes; 46 }; 47 48 struct zpci_fmb_fmt1 { 49 u64 rx_bytes; 50 u64 rx_packets; 51 u64 tx_bytes; 52 u64 tx_packets; 53 }; 54 55 struct zpci_fmb_fmt2 { 56 u64 consumed_work_units; 57 u64 max_work_units; 58 }; 59 60 struct zpci_fmb_fmt3 { 61 u64 tx_bytes; 62 }; 63 64 struct zpci_fmb { 65 u32 format : 8; 66 u32 fmt_ind : 24; 67 u32 samples; 68 u64 last_update; 69 /* common counters */ 70 u64 ld_ops; 71 u64 st_ops; 72 u64 stb_ops; 73 u64 rpcit_ops; 74 /* format specific counters */ 75 union { 76 struct zpci_fmb_fmt0 fmt0; 77 struct zpci_fmb_fmt1 fmt1; 78 struct zpci_fmb_fmt2 fmt2; 79 struct zpci_fmb_fmt3 fmt3; 80 }; 81 } __packed __aligned(128); 82 83 enum zpci_state { 84 ZPCI_FN_STATE_STANDBY = 0, 85 ZPCI_FN_STATE_CONFIGURED = 1, 86 ZPCI_FN_STATE_RESERVED = 2, 87 }; 88 89 struct zpci_bar_struct { 90 struct resource *res; /* bus resource */ 91 void __iomem *mio_wb; 92 void __iomem *mio_wt; 93 u32 val; /* bar start & 3 flag bits */ 94 u16 map_idx; /* index into bar mapping array */ 95 u8 size; /* order 2 exponent */ 96 }; 97 98 struct s390_domain; 99 100 #define ZPCI_FUNCTIONS_PER_BUS 256 101 struct zpci_bus { 102 struct kref kref; 103 struct pci_bus *bus; 104 struct zpci_dev *function[ZPCI_FUNCTIONS_PER_BUS]; 105 struct list_head resources; 106 struct list_head bus_next; 107 struct resource bus_resource; 108 int pchid; 109 int domain_nr; 110 bool multifunction; 111 enum pci_bus_speed max_bus_speed; 112 }; 113 114 /* Private data per function */ 115 struct zpci_dev { 116 struct zpci_bus *zbus; 117 struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */ 118 struct list_head bus_next; 119 struct kref kref; 120 struct hotplug_slot hotplug_slot; 121 122 enum zpci_state state; 123 u32 fid; /* function ID, used by sclp */ 124 u32 fh; /* function handle, used by insn's */ 125 u16 vfn; /* virtual function number */ 126 u16 pchid; /* physical channel ID */ 127 u8 pfgid; /* function group ID */ 128 u8 pft; /* pci function type */ 129 u8 port; 130 u8 rid_available : 1; 131 u8 has_hp_slot : 1; 132 u8 has_resources : 1; 133 u8 is_physfn : 1; 134 u8 util_str_avail : 1; 135 u8 irqs_registered : 1; 136 u8 reserved : 2; 137 unsigned int devfn; /* DEVFN part of the RID*/ 138 139 struct mutex lock; 140 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */ 141 u32 uid; /* user defined id */ 142 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */ 143 144 /* IRQ stuff */ 145 u64 msi_addr; /* MSI address */ 146 unsigned int max_msi; /* maximum number of MSI's */ 147 unsigned int msi_first_bit; 148 unsigned int msi_nr_irqs; 149 struct airq_iv *aibv; /* adapter interrupt bit vector */ 150 unsigned long aisb; /* number of the summary bit */ 151 152 /* DMA stuff */ 153 unsigned long *dma_table; 154 spinlock_t dma_table_lock; 155 int tlb_refresh; 156 157 spinlock_t iommu_bitmap_lock; 158 unsigned long *iommu_bitmap; 159 unsigned long *lazy_bitmap; 160 unsigned long iommu_size; 161 unsigned long iommu_pages; 162 unsigned int next_bit; 163 164 struct iommu_device iommu_dev; /* IOMMU core handle */ 165 166 char res_name[16]; 167 bool mio_capable; 168 struct zpci_bar_struct bars[PCI_STD_NUM_BARS]; 169 170 u64 start_dma; /* Start of available DMA addresses */ 171 u64 end_dma; /* End of available DMA addresses */ 172 u64 dma_mask; /* DMA address space mask */ 173 174 /* Function measurement block */ 175 struct zpci_fmb *fmb; 176 u16 fmb_update; /* update interval */ 177 u16 fmb_length; 178 /* software counters */ 179 atomic64_t allocated_pages; 180 atomic64_t mapped_pages; 181 atomic64_t unmapped_pages; 182 183 u8 version; 184 enum pci_bus_speed max_bus_speed; 185 186 struct dentry *debugfs_dev; 187 188 struct s390_domain *s390_domain; /* s390 IOMMU domain data */ 189 }; 190 191 static inline bool zdev_enabled(struct zpci_dev *zdev) 192 { 193 return (zdev->fh & (1UL << 31)) ? true : false; 194 } 195 196 extern const struct attribute_group *zpci_attr_groups[]; 197 extern unsigned int s390_pci_force_floating __initdata; 198 extern unsigned int s390_pci_no_rid; 199 200 /* ----------------------------------------------------------------------------- 201 Prototypes 202 ----------------------------------------------------------------------------- */ 203 /* Base stuff */ 204 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state); 205 int zpci_enable_device(struct zpci_dev *); 206 int zpci_disable_device(struct zpci_dev *); 207 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh); 208 int zpci_deconfigure_device(struct zpci_dev *zdev); 209 void zpci_device_reserved(struct zpci_dev *zdev); 210 bool zpci_is_device_configured(struct zpci_dev *zdev); 211 212 int zpci_hot_reset_device(struct zpci_dev *zdev); 213 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64); 214 int zpci_unregister_ioat(struct zpci_dev *, u8); 215 void zpci_remove_reserved_devices(void); 216 void zpci_update_fh(struct zpci_dev *zdev, u32 fh); 217 218 /* CLP */ 219 int clp_setup_writeback_mio(void); 220 int clp_scan_pci_devices(void); 221 int clp_query_pci_fn(struct zpci_dev *zdev); 222 int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as); 223 int clp_disable_fh(struct zpci_dev *zdev, u32 *fh); 224 int clp_get_state(u32 fid, enum zpci_state *state); 225 int clp_refresh_fh(u32 fid, u32 *fh); 226 227 /* UID */ 228 void update_uid_checking(bool new); 229 230 /* IOMMU Interface */ 231 int zpci_init_iommu(struct zpci_dev *zdev); 232 void zpci_destroy_iommu(struct zpci_dev *zdev); 233 234 #ifdef CONFIG_PCI 235 static inline bool zpci_use_mio(struct zpci_dev *zdev) 236 { 237 return static_branch_likely(&have_mio) && zdev->mio_capable; 238 } 239 240 /* Error handling and recovery */ 241 void zpci_event_error(void *); 242 void zpci_event_availability(void *); 243 bool zpci_is_enabled(void); 244 #else /* CONFIG_PCI */ 245 static inline void zpci_event_error(void *e) {} 246 static inline void zpci_event_availability(void *e) {} 247 #endif /* CONFIG_PCI */ 248 249 #ifdef CONFIG_HOTPLUG_PCI_S390 250 int zpci_init_slot(struct zpci_dev *); 251 void zpci_exit_slot(struct zpci_dev *); 252 #else /* CONFIG_HOTPLUG_PCI_S390 */ 253 static inline int zpci_init_slot(struct zpci_dev *zdev) 254 { 255 return 0; 256 } 257 static inline void zpci_exit_slot(struct zpci_dev *zdev) {} 258 #endif /* CONFIG_HOTPLUG_PCI_S390 */ 259 260 /* Helpers */ 261 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev) 262 { 263 struct zpci_bus *zbus = pdev->sysdata; 264 265 return zbus->function[pdev->devfn]; 266 } 267 268 static inline struct zpci_dev *to_zpci_dev(struct device *dev) 269 { 270 return to_zpci(to_pci_dev(dev)); 271 } 272 273 struct zpci_dev *get_zdev_by_fid(u32); 274 275 /* DMA */ 276 int zpci_dma_init(void); 277 void zpci_dma_exit(void); 278 int zpci_dma_init_device(struct zpci_dev *zdev); 279 int zpci_dma_exit_device(struct zpci_dev *zdev); 280 281 /* IRQ */ 282 int __init zpci_irq_init(void); 283 void __init zpci_irq_exit(void); 284 285 /* FMB */ 286 int zpci_fmb_enable_device(struct zpci_dev *); 287 int zpci_fmb_disable_device(struct zpci_dev *); 288 289 /* Debug */ 290 int zpci_debug_init(void); 291 void zpci_debug_exit(void); 292 void zpci_debug_init_device(struct zpci_dev *, const char *); 293 void zpci_debug_exit_device(struct zpci_dev *); 294 295 /* Error handling */ 296 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *); 297 int zpci_clear_error_state(struct zpci_dev *zdev); 298 int zpci_reset_load_store_blocked(struct zpci_dev *zdev); 299 300 #ifdef CONFIG_NUMA 301 302 /* Returns the node based on PCI bus */ 303 static inline int __pcibus_to_node(const struct pci_bus *bus) 304 { 305 return NUMA_NO_NODE; 306 } 307 308 static inline const struct cpumask * 309 cpumask_of_pcibus(const struct pci_bus *bus) 310 { 311 return cpu_online_mask; 312 } 313 314 #endif /* CONFIG_NUMA */ 315 316 #endif 317