arch/s390/include/asm/pci.h

   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              util_str_avail  : 1;
 136         u8              reserved        : 4;
 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 int zpci_create_device(struct zpci_dev *);
 205 void zpci_remove_device(struct zpci_dev *zdev);
 206 int zpci_enable_device(struct zpci_dev *);
 207 int zpci_disable_device(struct zpci_dev *);
 208 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
 209 int zpci_unregister_ioat(struct zpci_dev *, u8);
 210 void zpci_remove_reserved_devices(void);
 211
 212 /* CLP */
 213 int clp_setup_writeback_mio(void);
 214 int clp_scan_pci_devices(void);
 215 int clp_add_pci_device(u32, u32, int);
 216 int clp_enable_fh(struct zpci_dev *, u8);
 217 int clp_disable_fh(struct zpci_dev *);
 218 int clp_get_state(u32 fid, enum zpci_state *state);
 219
 220 /* UID */
 221 void update_uid_checking(bool new);
 222
 223 /* IOMMU Interface */
 224 int zpci_init_iommu(struct zpci_dev *zdev);
 225 void zpci_destroy_iommu(struct zpci_dev *zdev);
 226
 227 #ifdef CONFIG_PCI
 228 static inline bool zpci_use_mio(struct zpci_dev *zdev)
 229 {
 230         return static_branch_likely(&have_mio) && zdev->mio_capable;
 231 }
 232
 233 /* Error handling and recovery */
 234 void zpci_event_error(void *);
 235 void zpci_event_availability(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 #endif /* CONFIG_PCI */
 241
 242 #ifdef CONFIG_HOTPLUG_PCI_S390
 243 int zpci_init_slot(struct zpci_dev *);
 244 void zpci_exit_slot(struct zpci_dev *);
 245 #else /* CONFIG_HOTPLUG_PCI_S390 */
 246 static inline int zpci_init_slot(struct zpci_dev *zdev)
 247 {
 248         return 0;
 249 }
 250 static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
 251 #endif /* CONFIG_HOTPLUG_PCI_S390 */
 252
 253 /* Helpers */
 254 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev)
 255 {
 256         struct zpci_bus *zbus = pdev->sysdata;
 257
 258         return zbus->function[pdev->devfn];
 259 }
 260
 261 static inline struct zpci_dev *to_zpci_dev(struct device *dev)
 262 {
 263         return to_zpci(to_pci_dev(dev));
 264 }
 265
 266 struct zpci_dev *get_zdev_by_fid(u32);
 267
 268 /* DMA */
 269 int zpci_dma_init(void);
 270 void zpci_dma_exit(void);
 271
 272 int __init zpci_irq_init(void);
 273 void __init zpci_irq_exit(void);
 274
 275 /* FMB */
 276 int zpci_fmb_enable_device(struct zpci_dev *);
 277 int zpci_fmb_disable_device(struct zpci_dev *);
 278
 279 /* Debug */
 280 int zpci_debug_init(void);
 281 void zpci_debug_exit(void);
 282 void zpci_debug_init_device(struct zpci_dev *, const char *);
 283 void zpci_debug_exit_device(struct zpci_dev *);
 284
 285 /* Error reporting */
 286 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
 287
 288 #ifdef CONFIG_NUMA
 289
 290 /* Returns the node based on PCI bus */
 291 static inline int __pcibus_to_node(const struct pci_bus *bus)
 292 {
 293         return NUMA_NO_NODE;
 294 }
 295
 296 static inline const struct cpumask *
 297 cpumask_of_pcibus(const struct pci_bus *bus)
 298 {
 299         return cpu_online_mask;
 300 }
 301
 302 #endif /* CONFIG_NUMA */
 303
 304 #endif