ceph/src/seastar/dpdk/drivers/bus/pci/rte_bus_pci.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2015 Intel Corporation.
   3  * Copyright 2013-2014 6WIND S.A.
   4  */
   5
   6 #ifndef _RTE_BUS_PCI_H_
   7 #define _RTE_BUS_PCI_H_
   8
   9 /**
  10  * @file
  11  *
  12  * RTE PCI Bus Interface
  13  */
  14
  15 #ifdef __cplusplus
  16 extern "C" {
  17 #endif
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <limits.h>
  22 #include <errno.h>
  23 #include <sys/queue.h>
  24 #include <stdint.h>
  25 #include <inttypes.h>
  26
  27 #include <rte_debug.h>
  28 #include <rte_interrupts.h>
  29 #include <rte_dev.h>
  30 #include <rte_bus.h>
  31 #include <rte_pci.h>
  32
  33 /** Pathname of PCI devices directory. */
  34 const char *rte_pci_get_sysfs_path(void);
  35
  36 /* Forward declarations */
  37 struct rte_pci_device;
  38 struct rte_pci_driver;
  39
  40 /** List of PCI devices */
  41 TAILQ_HEAD(rte_pci_device_list, rte_pci_device);
  42 /** List of PCI drivers */
  43 TAILQ_HEAD(rte_pci_driver_list, rte_pci_driver);
  44
  45 /* PCI Bus iterators */
  46 #define FOREACH_DEVICE_ON_PCIBUS(p)     \
  47                 TAILQ_FOREACH(p, &(rte_pci_bus.device_list), next)
  48
  49 #define FOREACH_DRIVER_ON_PCIBUS(p)     \
  50                 TAILQ_FOREACH(p, &(rte_pci_bus.driver_list), next)
  51
  52 struct rte_devargs;
  53
  54 /**
  55  * A structure describing a PCI device.
  56  */
  57 struct rte_pci_device {
  58         TAILQ_ENTRY(rte_pci_device) next;   /**< Next probed PCI device. */
  59         struct rte_device device;           /**< Inherit core device */
  60         struct rte_pci_addr addr;           /**< PCI location. */
  61         struct rte_pci_id id;               /**< PCI ID. */
  62         struct rte_mem_resource mem_resource[PCI_MAX_RESOURCE];
  63                                             /**< PCI Memory Resource */
  64         struct rte_intr_handle intr_handle; /**< Interrupt handle */
  65         struct rte_pci_driver *driver;      /**< PCI driver used in probing */
  66         uint16_t max_vfs;                   /**< sriov enable if not zero */
  67         enum rte_kernel_driver kdrv;        /**< Kernel driver passthrough */
  68         char name[PCI_PRI_STR_SIZE+1];      /**< PCI location (ASCII) */
  69         struct rte_intr_handle vfio_req_intr_handle;
  70                                 /**< Handler of VFIO request interrupt */
  71 };
  72
  73 /**
  74  * @internal
  75  * Helper macro for drivers that need to convert to struct rte_pci_device.
  76  */
  77 #define RTE_DEV_TO_PCI(ptr) container_of(ptr, struct rte_pci_device, device)
  78
  79 #define RTE_DEV_TO_PCI_CONST(ptr) \
  80         container_of(ptr, const struct rte_pci_device, device)
  81
  82 #define RTE_ETH_DEV_TO_PCI(eth_dev)     RTE_DEV_TO_PCI((eth_dev)->device)
  83
  84 /** Any PCI device identifier (vendor, device, ...) */
  85 #define PCI_ANY_ID (0xffff)
  86 #define RTE_CLASS_ANY_ID (0xffffff)
  87
  88 #ifdef __cplusplus
  89 /** C++ macro used to help building up tables of device IDs */
  90 #define RTE_PCI_DEVICE(vend, dev) \
  91         RTE_CLASS_ANY_ID,         \
  92         (vend),                   \
  93         (dev),                    \
  94         PCI_ANY_ID,               \
  95         PCI_ANY_ID
  96 #else
  97 /** Macro used to help building up tables of device IDs */
  98 #define RTE_PCI_DEVICE(vend, dev)          \
  99         .class_id = RTE_CLASS_ANY_ID,      \
 100         .vendor_id = (vend),               \
 101         .device_id = (dev),                \
 102         .subsystem_vendor_id = PCI_ANY_ID, \
 103         .subsystem_device_id = PCI_ANY_ID
 104 #endif
 105
 106 /**
 107  * Initialisation function for the driver called during PCI probing.
 108  */
 109 typedef int (pci_probe_t)(struct rte_pci_driver *, struct rte_pci_device *);
 110
 111 /**
 112  * Uninitialisation function for the driver called during hotplugging.
 113  */
 114 typedef int (pci_remove_t)(struct rte_pci_device *);
 115
 116 /**
 117  * Driver-specific DMA mapping. After a successful call the device
 118  * will be able to read/write from/to this segment.
 119  *
 120  * @param dev
 121  *   Pointer to the PCI device.
 122  * @param addr
 123  *   Starting virtual address of memory to be mapped.
 124  * @param iova
 125  *   Starting IOVA address of memory to be mapped.
 126  * @param len
 127  *   Length of memory segment being mapped.
 128  * @return
 129  *   - 0 On success.
 130  *   - Negative value and rte_errno is set otherwise.
 131  */
 132 typedef int (pci_dma_map_t)(struct rte_pci_device *dev, void *addr,
 133                             uint64_t iova, size_t len);
 134
 135 /**
 136  * Driver-specific DMA un-mapping. After a successful call the device
 137  * will not be able to read/write from/to this segment.
 138  *
 139  * @param dev
 140  *   Pointer to the PCI device.
 141  * @param addr
 142  *   Starting virtual address of memory to be unmapped.
 143  * @param iova
 144  *   Starting IOVA address of memory to be unmapped.
 145  * @param len
 146  *   Length of memory segment being unmapped.
 147  * @return
 148  *   - 0 On success.
 149  *   - Negative value and rte_errno is set otherwise.
 150  */
 151 typedef int (pci_dma_unmap_t)(struct rte_pci_device *dev, void *addr,
 152                               uint64_t iova, size_t len);
 153
 154 /**
 155  * A structure describing a PCI driver.
 156  */
 157 struct rte_pci_driver {
 158         TAILQ_ENTRY(rte_pci_driver) next;  /**< Next in list. */
 159         struct rte_driver driver;          /**< Inherit core driver. */
 160         struct rte_pci_bus *bus;           /**< PCI bus reference. */
 161         pci_probe_t *probe;                /**< Device Probe function. */
 162         pci_remove_t *remove;              /**< Device Remove function. */
 163         pci_dma_map_t *dma_map;            /**< device dma map function. */
 164         pci_dma_unmap_t *dma_unmap;        /**< device dma unmap function. */
 165         const struct rte_pci_id *id_table; /**< ID table, NULL terminated. */
 166         uint32_t drv_flags;                /**< Flags RTE_PCI_DRV_*. */
 167 };
 168
 169 /**
 170  * Structure describing the PCI bus
 171  */
 172 struct rte_pci_bus {
 173         struct rte_bus bus;               /**< Inherit the generic class */
 174         struct rte_pci_device_list device_list;  /**< List of PCI devices */
 175         struct rte_pci_driver_list driver_list;  /**< List of PCI drivers */
 176 };
 177
 178 /** Device needs PCI BAR mapping (done with either IGB_UIO or VFIO) */
 179 #define RTE_PCI_DRV_NEED_MAPPING 0x0001
 180 /** Device needs PCI BAR mapping with enabled write combining (wc) */
 181 #define RTE_PCI_DRV_WC_ACTIVATE 0x0002
 182 /** Device already probed can be probed again to check for new ports. */
 183 #define RTE_PCI_DRV_PROBE_AGAIN 0x0004
 184 /** Device driver supports link state interrupt */
 185 #define RTE_PCI_DRV_INTR_LSC    0x0008
 186 /** Device driver supports device removal interrupt */
 187 #define RTE_PCI_DRV_INTR_RMV 0x0010
 188 /** Device driver needs to keep mapped resources if unsupported dev detected */
 189 #define RTE_PCI_DRV_KEEP_MAPPED_RES 0x0020
 190 /** Device driver supports IOVA as VA */
 191 #define RTE_PCI_DRV_IOVA_AS_VA 0X0040
 192
 193 /**
 194  * Map the PCI device resources in user space virtual memory address
 195  *
 196  * Note that driver should not call this function when flag
 197  * RTE_PCI_DRV_NEED_MAPPING is set, as EAL will do that for
 198  * you when it's on.
 199  *
 200  * @param dev
 201  *   A pointer to a rte_pci_device structure describing the device
 202  *   to use
 203  *
 204  * @return
 205  *   0 on success, negative on error and positive if no driver
 206  *   is found for the device.
 207  */
 208 int rte_pci_map_device(struct rte_pci_device *dev);
 209
 210 /**
 211  * Unmap this device
 212  *
 213  * @param dev
 214  *   A pointer to a rte_pci_device structure describing the device
 215  *   to use
 216  */
 217 void rte_pci_unmap_device(struct rte_pci_device *dev);
 218
 219 /**
 220  * Dump the content of the PCI bus.
 221  *
 222  * @param f
 223  *   A pointer to a file for output
 224  */
 225 void rte_pci_dump(FILE *f);
 226
 227 /**
 228  * Register a PCI driver.
 229  *
 230  * @param driver
 231  *   A pointer to a rte_pci_driver structure describing the driver
 232  *   to be registered.
 233  */
 234 void rte_pci_register(struct rte_pci_driver *driver);
 235
 236 /** Helper for PCI device registration from driver (eth, crypto) instance */
 237 #define RTE_PMD_REGISTER_PCI(nm, pci_drv) \
 238 RTE_INIT(pciinitfn_ ##nm) \
 239 {\
 240         (pci_drv).driver.name = RTE_STR(nm);\
 241         rte_pci_register(&pci_drv); \
 242 } \
 243 RTE_PMD_EXPORT_NAME(nm, __COUNTER__)
 244
 245 /**
 246  * Unregister a PCI driver.
 247  *
 248  * @param driver
 249  *   A pointer to a rte_pci_driver structure describing the driver
 250  *   to be unregistered.
 251  */
 252 void rte_pci_unregister(struct rte_pci_driver *driver);
 253
 254 /**
 255  * Read PCI config space.
 256  *
 257  * @param device
 258  *   A pointer to a rte_pci_device structure describing the device
 259  *   to use
 260  * @param buf
 261  *   A data buffer where the bytes should be read into
 262  * @param len
 263  *   The length of the data buffer.
 264  * @param offset
 265  *   The offset into PCI config space
 266  * @return
 267  *  Number of bytes read on success, negative on error.
 268  */
 269 int rte_pci_read_config(const struct rte_pci_device *device,
 270                 void *buf, size_t len, off_t offset);
 271
 272 /**
 273  * Write PCI config space.
 274  *
 275  * @param device
 276  *   A pointer to a rte_pci_device structure describing the device
 277  *   to use
 278  * @param buf
 279  *   A data buffer containing the bytes should be written
 280  * @param len
 281  *   The length of the data buffer.
 282  * @param offset
 283  *   The offset into PCI config space
 284  */
 285 int rte_pci_write_config(const struct rte_pci_device *device,
 286                 const void *buf, size_t len, off_t offset);
 287
 288 /**
 289  * A structure used to access io resources for a pci device.
 290  * rte_pci_ioport is arch, os, driver specific, and should not be used outside
 291  * of pci ioport api.
 292  */
 293 struct rte_pci_ioport {
 294         struct rte_pci_device *dev;
 295         uint64_t base;
 296         uint64_t len; /* only filled for memory mapped ports */
 297 };
 298
 299 /**
 300  * Initialize a rte_pci_ioport object for a pci device io resource.
 301  *
 302  * This object is then used to gain access to those io resources (see below).
 303  *
 304  * @param dev
 305  *   A pointer to a rte_pci_device structure describing the device
 306  *   to use.
 307  * @param bar
 308  *   Index of the io pci resource we want to access.
 309  * @param p
 310  *   The rte_pci_ioport object to be initialized.
 311  * @return
 312  *  0 on success, negative on error.
 313  */
 314 int rte_pci_ioport_map(struct rte_pci_device *dev, int bar,
 315                 struct rte_pci_ioport *p);
 316
 317 /**
 318  * Release any resources used in a rte_pci_ioport object.
 319  *
 320  * @param p
 321  *   The rte_pci_ioport object to be uninitialized.
 322  * @return
 323  *  0 on success, negative on error.
 324  */
 325 int rte_pci_ioport_unmap(struct rte_pci_ioport *p);
 326
 327 /**
 328  * Read from a io pci resource.
 329  *
 330  * @param p
 331  *   The rte_pci_ioport object from which we want to read.
 332  * @param data
 333  *   A data buffer where the bytes should be read into
 334  * @param len
 335  *   The length of the data buffer.
 336  * @param offset
 337  *   The offset into the pci io resource.
 338  */
 339 void rte_pci_ioport_read(struct rte_pci_ioport *p,
 340                 void *data, size_t len, off_t offset);
 341
 342 /**
 343  * Write to a io pci resource.
 344  *
 345  * @param p
 346  *   The rte_pci_ioport object to which we want to write.
 347  * @param data
 348  *   A data buffer where the bytes should be read into
 349  * @param len
 350  *   The length of the data buffer.
 351  * @param offset
 352  *   The offset into the pci io resource.
 353  */
 354 void rte_pci_ioport_write(struct rte_pci_ioport *p,
 355                 const void *data, size_t len, off_t offset);
 356
 357 #ifdef __cplusplus
 358 }
 359 #endif
 360
 361 #endif /* _RTE_BUS_PCI_H_ */