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 ZPCI_FN_STATE_ONLINE = 3, 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; 101 102 #define ZPCI_FUNCTIONS_PER_BUS 256 103 struct zpci_bus { 104 struct kref kref; 105 struct pci_bus *bus; 106 struct zpci_dev *function[ZPCI_FUNCTIONS_PER_BUS]; 107 struct list_head resources; 108 struct list_head bus_next; 109 struct resource bus_resource; 110 int pchid; 111 int domain_nr; 112 bool multifunction; 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 list_head bus_next; 121 struct kref kref; 122 struct hotplug_slot hotplug_slot; 123 124 enum zpci_state state; 125 u32 fid; /* function ID, used by sclp */ 126 u32 fh; /* function handle, used by insn's */ 127 u16 vfn; /* virtual function number */ 128 u16 pchid; /* physical channel ID */ 129 u8 pfgid; /* function group ID */ 130 u8 pft; /* pci function type */ 131 u8 port; 132 u8 rid_available : 1; 133 u8 has_hp_slot : 1; 134 u8 is_physfn : 1; 135 u8 reserved : 5; 136 unsigned int devfn; /* DEVFN part of the RID*/ 137 138 struct mutex lock; 139 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */ 140 u32 uid; /* user defined id */ 141 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */ 142 143 /* IRQ stuff */ 144 u64 msi_addr; /* MSI address */ 145 unsigned int max_msi; /* maximum number of MSI's */ 146 unsigned int msi_first_bit; 147 unsigned int msi_nr_irqs; 148 struct airq_iv *aibv; /* adapter interrupt bit vector */ 149 unsigned long aisb; /* number of the summary bit */ 150 151 /* DMA stuff */ 152 unsigned long *dma_table; 153 spinlock_t dma_table_lock; 154 int tlb_refresh; 155 156 spinlock_t iommu_bitmap_lock; 157 unsigned long *iommu_bitmap; 158 unsigned long *lazy_bitmap; 159 unsigned long iommu_size; 160 unsigned long iommu_pages; 161 unsigned int next_bit; 162 163 struct iommu_device iommu_dev; /* IOMMU core handle */ 164 165 char res_name[16]; 166 bool mio_capable; 167 struct zpci_bar_struct bars[PCI_STD_NUM_BARS]; 168 169 u64 start_dma; /* Start of available DMA addresses */ 170 u64 end_dma; /* End of available DMA addresses */ 171 u64 dma_mask; /* DMA address space mask */ 172 173 /* Function measurement block */ 174 struct zpci_fmb *fmb; 175 u16 fmb_update; /* update interval */ 176 u16 fmb_length; 177 /* software counters */ 178 atomic64_t allocated_pages; 179 atomic64_t mapped_pages; 180 atomic64_t unmapped_pages; 181 182 enum pci_bus_speed max_bus_speed; 183 184 struct dentry *debugfs_dev; 185 186 struct s390_domain *s390_domain; /* s390 IOMMU domain data */ 187 }; 188 189 static inline bool zdev_enabled(struct zpci_dev *zdev) 190 { 191 return (zdev->fh & (1UL << 31)) ? true : false; 192 } 193 194 extern const struct attribute_group *zpci_attr_groups[]; 195 extern unsigned int s390_pci_force_floating __initdata; 196 extern unsigned int s390_pci_no_rid; 197 198 /* ----------------------------------------------------------------------------- 199 Prototypes 200 ----------------------------------------------------------------------------- */ 201 /* Base stuff */ 202 int zpci_create_device(struct zpci_dev *); 203 void zpci_remove_device(struct zpci_dev *zdev); 204 int zpci_enable_device(struct zpci_dev *); 205 int zpci_disable_device(struct zpci_dev *); 206 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64); 207 int zpci_unregister_ioat(struct zpci_dev *, u8); 208 void zpci_remove_reserved_devices(void); 209 210 /* CLP */ 211 int clp_scan_pci_devices(void); 212 int clp_rescan_pci_devices(void); 213 int clp_rescan_pci_devices_simple(u32 *fid); 214 int clp_add_pci_device(u32, u32, int); 215 int clp_enable_fh(struct zpci_dev *, u8); 216 int clp_disable_fh(struct zpci_dev *); 217 int clp_get_state(u32 fid, enum zpci_state *state); 218 219 /* UID */ 220 void update_uid_checking(bool new); 221 222 /* IOMMU Interface */ 223 int zpci_init_iommu(struct zpci_dev *zdev); 224 void zpci_destroy_iommu(struct zpci_dev *zdev); 225 226 #ifdef CONFIG_PCI 227 static inline bool zpci_use_mio(struct zpci_dev *zdev) 228 { 229 return static_branch_likely(&have_mio) && zdev->mio_capable; 230 } 231 232 /* Error handling and recovery */ 233 void zpci_event_error(void *); 234 void zpci_event_availability(void *); 235 void zpci_rescan(void); 236 bool zpci_is_enabled(void); 237 #else /* CONFIG_PCI */ 238 static inline void zpci_event_error(void *e) {} 239 static inline void zpci_event_availability(void *e) {} 240 static inline void zpci_rescan(void) {} 241 #endif /* CONFIG_PCI */ 242 243 #ifdef CONFIG_HOTPLUG_PCI_S390 244 int zpci_init_slot(struct zpci_dev *); 245 void zpci_exit_slot(struct zpci_dev *); 246 #else /* CONFIG_HOTPLUG_PCI_S390 */ 247 static inline int zpci_init_slot(struct zpci_dev *zdev) 248 { 249 return 0; 250 } 251 static inline void zpci_exit_slot(struct zpci_dev *zdev) {} 252 #endif /* CONFIG_HOTPLUG_PCI_S390 */ 253 254 /* Helpers */ 255 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev) 256 { 257 struct zpci_bus *zbus = pdev->sysdata; 258 259 return zbus->function[pdev->devfn]; 260 } 261 262 static inline struct zpci_dev *to_zpci_dev(struct device *dev) 263 { 264 return to_zpci(to_pci_dev(dev)); 265 } 266 267 struct zpci_dev *get_zdev_by_fid(u32); 268 269 /* DMA */ 270 int zpci_dma_init(void); 271 void zpci_dma_exit(void); 272 273 int __init zpci_irq_init(void); 274 void __init zpci_irq_exit(void); 275 276 /* FMB */ 277 int zpci_fmb_enable_device(struct zpci_dev *); 278 int zpci_fmb_disable_device(struct zpci_dev *); 279 280 /* Debug */ 281 int zpci_debug_init(void); 282 void zpci_debug_exit(void); 283 void zpci_debug_init_device(struct zpci_dev *, const char *); 284 void zpci_debug_exit_device(struct zpci_dev *); 285 void zpci_debug_info(struct zpci_dev *, struct seq_file *); 286 287 /* Error reporting */ 288 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *); 289 290 #ifdef CONFIG_NUMA 291 292 /* Returns the node based on PCI bus */ 293 static inline int __pcibus_to_node(const struct pci_bus *bus) 294 { 295 return NUMA_NO_NODE; 296 } 297 298 static inline const struct cpumask * 299 cpumask_of_pcibus(const struct pci_bus *bus) 300 { 301 return cpu_online_mask; 302 } 303 304 #endif /* CONFIG_NUMA */ 305 306 #endif 307