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 <asm-generic/pci.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 #define ZPCI_DEVFN                      0       /* default device number */
  25
  26 #define ZPCI_NR_DMA_SPACES              1
  27 #define ZPCI_NR_DEVICES                 CONFIG_PCI_NR_FUNCTIONS
  28
  29 /* PCI Function Controls */
  30 #define ZPCI_FC_FN_ENABLED              0x80
  31 #define ZPCI_FC_ERROR                   0x40
  32 #define ZPCI_FC_BLOCKED                 0x20
  33 #define ZPCI_FC_DMA_ENABLED             0x10
  34
  35 #define ZPCI_FMB_DMA_COUNTER_VALID      (1 << 23)
  36
  37 struct zpci_fmb_fmt0 {
  38         u64 dma_rbytes;
  39         u64 dma_wbytes;
  40 };
  41
  42 struct zpci_fmb_fmt1 {
  43         u64 rx_bytes;
  44         u64 rx_packets;
  45         u64 tx_bytes;
  46         u64 tx_packets;
  47 };
  48
  49 struct zpci_fmb_fmt2 {
  50         u64 consumed_work_units;
  51         u64 max_work_units;
  52 };
  53
  54 struct zpci_fmb_fmt3 {
  55         u64 tx_bytes;
  56 };
  57
  58 struct zpci_fmb {
  59         u32 format      : 8;
  60         u32 fmt_ind     : 24;
  61         u32 samples;
  62         u64 last_update;
  63         /* common counters */
  64         u64 ld_ops;
  65         u64 st_ops;
  66         u64 stb_ops;
  67         u64 rpcit_ops;
  68         /* format specific counters */
  69         union {
  70                 struct zpci_fmb_fmt0 fmt0;
  71                 struct zpci_fmb_fmt1 fmt1;
  72                 struct zpci_fmb_fmt2 fmt2;
  73                 struct zpci_fmb_fmt3 fmt3;
  74         };
  75 } __packed __aligned(128);
  76
  77 enum zpci_state {
  78         ZPCI_FN_STATE_STANDBY = 0,
  79         ZPCI_FN_STATE_CONFIGURED = 1,
  80         ZPCI_FN_STATE_RESERVED = 2,
  81         ZPCI_FN_STATE_ONLINE = 3,
  82 };
  83
  84 struct zpci_bar_struct {
  85         struct resource *res;           /* bus resource */
  86         void __iomem    *mio_wb;
  87         void __iomem    *mio_wt;
  88         u32             val;            /* bar start & 3 flag bits */
  89         u16             map_idx;        /* index into bar mapping array */
  90         u8              size;           /* order 2 exponent */
  91 };
  92
  93 struct s390_domain;
  94
  95 /* Private data per function */
  96 struct zpci_dev {
  97         struct pci_bus  *bus;
  98         struct list_head entry;         /* list of all zpci_devices, needed for hotplug, etc. */
  99
 100         enum zpci_state state;
 101         u32             fid;            /* function ID, used by sclp */
 102         u32             fh;             /* function handle, used by insn's */
 103         u16             vfn;            /* virtual function number */
 104         u16             pchid;          /* physical channel ID */
 105         u8              pfgid;          /* function group ID */
 106         u8              pft;            /* pci function type */
 107         u16             domain;
 108
 109         struct mutex lock;
 110         u8 pfip[CLP_PFIP_NR_SEGMENTS];  /* pci function internal path */
 111         u32 uid;                        /* user defined id */
 112         u8 util_str[CLP_UTIL_STR_LEN];  /* utility string */
 113
 114         /* IRQ stuff */
 115         u64             msi_addr;       /* MSI address */
 116         unsigned int    max_msi;        /* maximum number of MSI's */
 117         unsigned int    msi_first_bit;
 118         unsigned int    msi_nr_irqs;
 119         struct airq_iv *aibv;           /* adapter interrupt bit vector */
 120         unsigned long   aisb;           /* number of the summary bit */
 121
 122         /* DMA stuff */
 123         unsigned long   *dma_table;
 124         spinlock_t      dma_table_lock;
 125         int             tlb_refresh;
 126
 127         spinlock_t      iommu_bitmap_lock;
 128         unsigned long   *iommu_bitmap;
 129         unsigned long   *lazy_bitmap;
 130         unsigned long   iommu_size;
 131         unsigned long   iommu_pages;
 132         unsigned int    next_bit;
 133
 134         struct iommu_device iommu_dev;  /* IOMMU core handle */
 135
 136         char res_name[16];
 137         bool mio_capable;
 138         struct zpci_bar_struct bars[PCI_STD_NUM_BARS];
 139
 140         u64             start_dma;      /* Start of available DMA addresses */
 141         u64             end_dma;        /* End of available DMA addresses */
 142         u64             dma_mask;       /* DMA address space mask */
 143
 144         /* Function measurement block */
 145         struct zpci_fmb *fmb;
 146         u16             fmb_update;     /* update interval */
 147         u16             fmb_length;
 148         /* software counters */
 149         atomic64_t allocated_pages;
 150         atomic64_t mapped_pages;
 151         atomic64_t unmapped_pages;
 152
 153         enum pci_bus_speed max_bus_speed;
 154
 155         struct dentry   *debugfs_dev;
 156
 157         struct s390_domain *s390_domain; /* s390 IOMMU domain data */
 158 };
 159
 160 static inline bool zdev_enabled(struct zpci_dev *zdev)
 161 {
 162         return (zdev->fh & (1UL << 31)) ? true : false;
 163 }
 164
 165 extern const struct attribute_group *zpci_attr_groups[];
 166 extern unsigned int s390_pci_force_floating __initdata;
 167
 168 /* -----------------------------------------------------------------------------
 169   Prototypes
 170 ----------------------------------------------------------------------------- */
 171 /* Base stuff */
 172 int zpci_create_device(struct zpci_dev *);
 173 void zpci_remove_device(struct zpci_dev *zdev);
 174 int zpci_enable_device(struct zpci_dev *);
 175 int zpci_disable_device(struct zpci_dev *);
 176 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
 177 int zpci_unregister_ioat(struct zpci_dev *, u8);
 178 void zpci_remove_reserved_devices(void);
 179
 180 /* CLP */
 181 int clp_scan_pci_devices(void);
 182 int clp_rescan_pci_devices(void);
 183 int clp_rescan_pci_devices_simple(u32 *fid);
 184 int clp_add_pci_device(u32, u32, int);
 185 int clp_enable_fh(struct zpci_dev *, u8);
 186 int clp_disable_fh(struct zpci_dev *);
 187 int clp_get_state(u32 fid, enum zpci_state *state);
 188
 189 /* IOMMU Interface */
 190 int zpci_init_iommu(struct zpci_dev *zdev);
 191 void zpci_destroy_iommu(struct zpci_dev *zdev);
 192
 193 #ifdef CONFIG_PCI
 194 static inline bool zpci_use_mio(struct zpci_dev *zdev)
 195 {
 196         return static_branch_likely(&have_mio) && zdev->mio_capable;
 197 }
 198
 199 /* Error handling and recovery */
 200 void zpci_event_error(void *);
 201 void zpci_event_availability(void *);
 202 void zpci_rescan(void);
 203 bool zpci_is_enabled(void);
 204 #else /* CONFIG_PCI */
 205 static inline void zpci_event_error(void *e) {}
 206 static inline void zpci_event_availability(void *e) {}
 207 static inline void zpci_rescan(void) {}
 208 #endif /* CONFIG_PCI */
 209
 210 #ifdef CONFIG_HOTPLUG_PCI_S390
 211 int zpci_init_slot(struct zpci_dev *);
 212 void zpci_exit_slot(struct zpci_dev *);
 213 #else /* CONFIG_HOTPLUG_PCI_S390 */
 214 static inline int zpci_init_slot(struct zpci_dev *zdev)
 215 {
 216         return 0;
 217 }
 218 static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
 219 #endif /* CONFIG_HOTPLUG_PCI_S390 */
 220
 221 /* Helpers */
 222 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev)
 223 {
 224         return pdev->sysdata;
 225 }
 226
 227 struct zpci_dev *get_zdev_by_fid(u32);
 228
 229 /* DMA */
 230 int zpci_dma_init(void);
 231 void zpci_dma_exit(void);
 232
 233 int __init zpci_irq_init(void);
 234 void __init zpci_irq_exit(void);
 235
 236 /* FMB */
 237 int zpci_fmb_enable_device(struct zpci_dev *);
 238 int zpci_fmb_disable_device(struct zpci_dev *);
 239
 240 /* Debug */
 241 int zpci_debug_init(void);
 242 void zpci_debug_exit(void);
 243 void zpci_debug_init_device(struct zpci_dev *, const char *);
 244 void zpci_debug_exit_device(struct zpci_dev *);
 245 void zpci_debug_info(struct zpci_dev *, struct seq_file *);
 246
 247 /* Error reporting */
 248 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
 249
 250 #ifdef CONFIG_NUMA
 251
 252 /* Returns the node based on PCI bus */
 253 static inline int __pcibus_to_node(const struct pci_bus *bus)
 254 {
 255         return NUMA_NO_NODE;
 256 }
 257
 258 static inline const struct cpumask *
 259 cpumask_of_pcibus(const struct pci_bus *bus)
 260 {
 261         return cpu_online_mask;
 262 }
 263
 264 #endif /* CONFIG_NUMA */
 265
 266 #endif