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 #define ZPCI_DEVFN 0 /* default device 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 ZPCI_FN_STATE_ONLINE = 3, 90 }; 91 92 struct zpci_bar_struct { 93 struct resource *res; /* bus resource */ 94 void __iomem *mio_wb; 95 void __iomem *mio_wt; 96 u32 val; /* bar start & 3 flag bits */ 97 u16 map_idx; /* index into bar mapping array */ 98 u8 size; /* order 2 exponent */ 99 }; 100 101 struct s390_domain; 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 enum pci_bus_speed max_bus_speed; 114 }; 115 116 /* Private data per function */ 117 struct zpci_dev { 118 struct zpci_bus *zbus; 119 struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */ 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 u16 vfn; /* virtual function number */ 127 u16 pchid; /* physical channel ID */ 128 u8 pfgid; /* function group ID */ 129 u8 pft; /* pci function type */ 130 u8 port; 131 u8 rid_available : 1; 132 u8 reserved : 7; 133 unsigned int devfn; /* DEVFN part of the RID*/ 134 135 struct mutex lock; 136 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */ 137 u32 uid; /* user defined id */ 138 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */ 139 140 /* IRQ stuff */ 141 u64 msi_addr; /* MSI address */ 142 unsigned int max_msi; /* maximum number of MSI's */ 143 unsigned int msi_first_bit; 144 unsigned int msi_nr_irqs; 145 struct airq_iv *aibv; /* adapter interrupt bit vector */ 146 unsigned long aisb; /* number of the summary bit */ 147 148 /* DMA stuff */ 149 unsigned long *dma_table; 150 spinlock_t dma_table_lock; 151 int tlb_refresh; 152 153 spinlock_t iommu_bitmap_lock; 154 unsigned long *iommu_bitmap; 155 unsigned long *lazy_bitmap; 156 unsigned long iommu_size; 157 unsigned long iommu_pages; 158 unsigned int next_bit; 159 160 struct iommu_device iommu_dev; /* IOMMU core handle */ 161 162 char res_name[16]; 163 bool mio_capable; 164 struct zpci_bar_struct bars[PCI_STD_NUM_BARS]; 165 166 u64 start_dma; /* Start of available DMA addresses */ 167 u64 end_dma; /* End of available DMA addresses */ 168 u64 dma_mask; /* DMA address space mask */ 169 170 /* Function measurement block */ 171 struct zpci_fmb *fmb; 172 u16 fmb_update; /* update interval */ 173 u16 fmb_length; 174 /* software counters */ 175 atomic64_t allocated_pages; 176 atomic64_t mapped_pages; 177 atomic64_t unmapped_pages; 178 179 enum pci_bus_speed max_bus_speed; 180 181 struct dentry *debugfs_dev; 182 183 struct s390_domain *s390_domain; /* s390 IOMMU domain data */ 184 }; 185 186 static inline bool zdev_enabled(struct zpci_dev *zdev) 187 { 188 return (zdev->fh & (1UL << 31)) ? true : false; 189 } 190 191 extern const struct attribute_group *zpci_attr_groups[]; 192 extern unsigned int s390_pci_force_floating __initdata; 193 extern unsigned int s390_pci_no_rid; 194 195 /* ----------------------------------------------------------------------------- 196 Prototypes 197 ----------------------------------------------------------------------------- */ 198 /* Base stuff */ 199 int zpci_create_device(struct zpci_dev *); 200 void zpci_remove_device(struct zpci_dev *zdev); 201 int zpci_enable_device(struct zpci_dev *); 202 int zpci_disable_device(struct zpci_dev *); 203 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64); 204 int zpci_unregister_ioat(struct zpci_dev *, u8); 205 void zpci_remove_reserved_devices(void); 206 207 /* CLP */ 208 int clp_scan_pci_devices(void); 209 int clp_rescan_pci_devices(void); 210 int clp_rescan_pci_devices_simple(u32 *fid); 211 int clp_add_pci_device(u32, u32, int); 212 int clp_enable_fh(struct zpci_dev *, u8); 213 int clp_disable_fh(struct zpci_dev *); 214 int clp_get_state(u32 fid, enum zpci_state *state); 215 216 /* UID */ 217 void update_uid_checking(bool new); 218 219 /* IOMMU Interface */ 220 int zpci_init_iommu(struct zpci_dev *zdev); 221 void zpci_destroy_iommu(struct zpci_dev *zdev); 222 223 #ifdef CONFIG_PCI 224 static inline bool zpci_use_mio(struct zpci_dev *zdev) 225 { 226 return static_branch_likely(&have_mio) && zdev->mio_capable; 227 } 228 229 /* Error handling and recovery */ 230 void zpci_event_error(void *); 231 void zpci_event_availability(void *); 232 void zpci_rescan(void); 233 bool zpci_is_enabled(void); 234 #else /* CONFIG_PCI */ 235 static inline void zpci_event_error(void *e) {} 236 static inline void zpci_event_availability(void *e) {} 237 static inline void zpci_rescan(void) {} 238 #endif /* CONFIG_PCI */ 239 240 #ifdef CONFIG_HOTPLUG_PCI_S390 241 int zpci_init_slot(struct zpci_dev *); 242 void zpci_exit_slot(struct zpci_dev *); 243 #else /* CONFIG_HOTPLUG_PCI_S390 */ 244 static inline int zpci_init_slot(struct zpci_dev *zdev) 245 { 246 return 0; 247 } 248 static inline void zpci_exit_slot(struct zpci_dev *zdev) {} 249 #endif /* CONFIG_HOTPLUG_PCI_S390 */ 250 251 /* Helpers */ 252 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev) 253 { 254 struct zpci_bus *zbus = pdev->sysdata; 255 256 return zbus->function[ZPCI_DEVFN]; 257 } 258 259 static inline struct zpci_dev *to_zpci_dev(struct device *dev) 260 { 261 return to_zpci(to_pci_dev(dev)); 262 } 263 264 struct zpci_dev *get_zdev_by_fid(u32); 265 266 /* DMA */ 267 int zpci_dma_init(void); 268 void zpci_dma_exit(void); 269 270 int __init zpci_irq_init(void); 271 void __init zpci_irq_exit(void); 272 273 /* FMB */ 274 int zpci_fmb_enable_device(struct zpci_dev *); 275 int zpci_fmb_disable_device(struct zpci_dev *); 276 277 /* Debug */ 278 int zpci_debug_init(void); 279 void zpci_debug_exit(void); 280 void zpci_debug_init_device(struct zpci_dev *, const char *); 281 void zpci_debug_exit_device(struct zpci_dev *); 282 void zpci_debug_info(struct zpci_dev *, struct seq_file *); 283 284 /* Error reporting */ 285 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *); 286 287 #ifdef CONFIG_NUMA 288 289 /* Returns the node based on PCI bus */ 290 static inline int __pcibus_to_node(const struct pci_bus *bus) 291 { 292 return NUMA_NO_NODE; 293 } 294 295 static inline const struct cpumask * 296 cpumask_of_pcibus(const struct pci_bus *bus) 297 { 298 return cpu_online_mask; 299 } 300 301 #endif /* CONFIG_NUMA */ 302 303 #endif 304