ceph/src/spdk/dpdk/drivers/bus/vmbus/rte_bus_vmbus.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright (c) 2018, Microsoft Corporation.
   3  * All Rights Reserved.
   4  */
   5
   6 #ifndef _VMBUS_H_
   7 #define _VMBUS_H_
   8
   9 /**
  10  * @file
  11  *
  12  * VMBUS Interface
  13  */
  14 #ifdef __cplusplus
  15 extern "C" {
  16 #endif
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <limits.h>
  21 #include <stdbool.h>
  22 #include <errno.h>
  23 #include <sys/queue.h>
  24 #include <stdint.h>
  25 #include <inttypes.h>
  26
  27 #include <rte_compat.h>
  28 #include <rte_uuid.h>
  29 #include <rte_debug.h>
  30 #include <rte_interrupts.h>
  31 #include <rte_dev.h>
  32 #include <rte_vmbus_reg.h>
  33
  34 /* Forward declarations */
  35 struct rte_vmbus_device;
  36 struct rte_vmbus_driver;
  37 struct rte_vmbus_bus;
  38 struct vmbus_channel;
  39 struct vmbus_mon_page;
  40
  41 TAILQ_HEAD(rte_vmbus_device_list, rte_vmbus_device);
  42 TAILQ_HEAD(rte_vmbus_driver_list, rte_vmbus_driver);
  43
  44 /* VMBus iterators */
  45 #define FOREACH_DEVICE_ON_VMBUS(p)      \
  46         TAILQ_FOREACH(p, &(rte_vmbus_bus.device_list), next)
  47
  48 #define FOREACH_DRIVER_ON_VMBUS(p)      \
  49         TAILQ_FOREACH(p, &(rte_vmbus_bus.driver_list), next)
  50
  51 /** Maximum number of VMBUS resources. */
  52 enum hv_uio_map {
  53         HV_TXRX_RING_MAP = 0,
  54         HV_INT_PAGE_MAP,
  55         HV_MON_PAGE_MAP,
  56         HV_RECV_BUF_MAP,
  57         HV_SEND_BUF_MAP
  58 };
  59 #define VMBUS_MAX_RESOURCE 5
  60
  61 /**
  62  * A structure describing a VMBUS device.
  63  */
  64 struct rte_vmbus_device {
  65         TAILQ_ENTRY(rte_vmbus_device) next;    /**< Next probed VMBUS device */
  66         const struct rte_vmbus_driver *driver; /**< Associated driver */
  67         struct rte_device device;              /**< Inherit core device */
  68         rte_uuid_t device_id;                  /**< VMBUS device id */
  69         rte_uuid_t class_id;                   /**< VMBUS device type */
  70         uint32_t relid;                        /**< id for primary */
  71         uint8_t monitor_id;                    /**< monitor page */
  72         int uio_num;                           /**< UIO device number */
  73         uint32_t *int_page;                    /**< VMBUS interrupt page */
  74         struct vmbus_channel *primary;         /**< VMBUS primary channel */
  75         struct vmbus_mon_page *monitor_page;   /**< VMBUS monitor page */
  76
  77         struct rte_intr_handle intr_handle;    /**< Interrupt handle */
  78         struct rte_mem_resource resource[VMBUS_MAX_RESOURCE];
  79 };
  80
  81 /**
  82  * Initialization function for the driver called during VMBUS probing.
  83  */
  84 typedef int (vmbus_probe_t)(struct rte_vmbus_driver *,
  85                             struct rte_vmbus_device *);
  86
  87 /**
  88  * Initialization function for the driver called during hot plugging.
  89  */
  90 typedef int (vmbus_remove_t)(struct rte_vmbus_device *);
  91
  92 /**
  93  * A structure describing a VMBUS driver.
  94  */
  95 struct rte_vmbus_driver {
  96         TAILQ_ENTRY(rte_vmbus_driver) next; /**< Next in list. */
  97         struct rte_driver driver;
  98         struct rte_vmbus_bus *bus;          /**< VM bus reference. */
  99         vmbus_probe_t *probe;               /**< Device Probe function. */
 100         vmbus_remove_t *remove;             /**< Device Remove function. */
 101
 102         const rte_uuid_t *id_table;         /**< ID table. */
 103 };
 104
 105
 106 /**
 107  * Structure describing the VM bus
 108  */
 109 struct rte_vmbus_bus {
 110         struct rte_bus bus;               /**< Inherit the generic class */
 111         struct rte_vmbus_device_list device_list;  /**< List of devices */
 112         struct rte_vmbus_driver_list driver_list;  /**< List of drivers */
 113 };
 114
 115 /**
 116  * Scan the content of the VMBUS bus, and the devices in the devices
 117  * list
 118  *
 119  * @return
 120  *  0 on success, negative on error
 121  */
 122 int rte_vmbus_scan(void);
 123
 124 /**
 125  * Probe the VMBUS bus
 126  *
 127  * @return
 128  *   - 0 on success.
 129  *   - !0 on error.
 130  */
 131 int rte_vmbus_probe(void);
 132
 133 /**
 134  * Map the VMBUS device resources in user space virtual memory address
 135  *
 136  * @param dev
 137  *   A pointer to a rte_vmbus_device structure describing the device
 138  *   to use
 139  *
 140  * @return
 141  *   0 on success, negative on error and positive if no driver
 142  *   is found for the device.
 143  */
 144 int rte_vmbus_map_device(struct rte_vmbus_device *dev);
 145
 146 /**
 147  * Unmap this device
 148  *
 149  * @param dev
 150  *   A pointer to a rte_vmbus_device structure describing the device
 151  *   to use
 152  */
 153 void rte_vmbus_unmap_device(struct rte_vmbus_device *dev);
 154
 155 /**
 156  * Get connection to primary VMBUS channel
 157  *
 158  * @param device
 159  *   A pointer to a rte_vmbus_device structure describing the device
 160  * @param chan
 161  *   A pointer to a VMBUS channel pointer that will be filled.
 162  * @return
 163  *   - 0 Success; channel opened.
 164  *   - -ENOMEM: Not enough memory available.
 165  *   - -EINVAL: Regions could not be mapped.
 166  */
 167 int rte_vmbus_chan_open(struct rte_vmbus_device *device,
 168                         struct vmbus_channel **chan);
 169
 170 /**
 171  * Free connection to VMBUS channel
 172  *
 173  * @param chan
 174  *    VMBUS channel
 175  */
 176 void rte_vmbus_chan_close(struct vmbus_channel *chan);
 177
 178 /**
 179  * Gets the maximum number of channels supported on device
 180  *
 181  * @param device
 182  *   A pointer to a rte_vmbus_device structure describing the device
 183  * @return
 184  *   Number of channels available.
 185  */
 186 int rte_vmbus_max_channels(const struct rte_vmbus_device *device);
 187
 188 /**
 189  * Get a connection to new secondary vmbus channel
 190  *
 191  * @param primary
 192  *   A pointer to primary VMBUS channel
 193  * @param chan
 194  *   A pointer to a secondary VMBUS channel pointer that will be filled.
 195  * @return
 196  *   - 0 Success; channel opened.
 197  *   - -ENOMEM: Not enough memory available.
 198  *   - -EINVAL: Regions could not be mapped.
 199  */
 200 int rte_vmbus_subchan_open(struct vmbus_channel *primary,
 201                            struct vmbus_channel **new_chan);
 202
 203 /**
 204  * Disable IRQ for device
 205  *
 206  * @param device
 207  *    VMBUS device
 208  */
 209 void rte_vmbus_irq_mask(struct rte_vmbus_device *device);
 210
 211 /**
 212  * Enable IRQ for device
 213  *
 214  * @param device
 215  *    VMBUS device
 216  */
 217 void rte_vmbus_irq_unmask(struct rte_vmbus_device *device);
 218
 219 /**
 220  * Read (and wait) for IRQ
 221  *
 222  * @param device
 223  *    VMBUS device
 224  */
 225 int rte_vmbus_irq_read(struct rte_vmbus_device *device);
 226
 227 /**
 228  * Test if channel is empty
 229  *
 230  * @param channel
 231  *      Pointer to vmbus_channel structure.
 232  * @return
 233  *      Return true if no data present in incoming ring.
 234  */
 235 bool rte_vmbus_chan_rx_empty(const struct vmbus_channel *channel);
 236
 237 /**
 238  * Send the specified buffer on the given channel
 239  *
 240  * @param channel
 241  *      Pointer to vmbus_channel structure.
 242  * @param type
 243  *      Type of packet that is being send e.g. negotiate, time
 244  *      packet etc.
 245  * @param data
 246  *      Pointer to the buffer to send
 247  * @param dlen
 248  *      Number of bytes of data to send
 249  * @param xact
 250  *      Identifier of the request
 251  * @param flags
 252  *      Message type inband, rxbuf, gpa
 253  * @param need_sig
 254  *      Is host signal tx is required (optional)
 255  *
 256  * Sends data in buffer directly to hyper-v via the vmbus
 257  */
 258 int rte_vmbus_chan_send(struct vmbus_channel *channel, uint16_t type,
 259                         void *data, uint32_t dlen,
 260                         uint64_t xact, uint32_t flags, bool *need_sig);
 261
 262 /**
 263  * Explicitly signal host that data is available
 264  *
 265  * @param
 266  *      Pointer to vmbus_channel structure.
 267  *
 268  * Used when batching multiple sends and only signaling host
 269  * after the last send.
 270  */
 271 void rte_vmbus_chan_signal_tx(const struct vmbus_channel *channel);
 272
 273 /* Structure for scatter/gather I/O */
 274 struct iova_list {
 275         rte_iova_t      addr;
 276         uint32_t        len;
 277 };
 278 #define MAX_PAGE_BUFFER_COUNT           32
 279
 280 /**
 281  * Send a scattered buffer on the given channel
 282  *
 283  * @param channel
 284  *      Pointer to vmbus_channel structure.
 285  * @param type
 286  *      Type of packet that is being send e.g. negotiate, time
 287  *      packet etc.
 288  * @param gpa
 289  *      Array of buffers to send
 290  * @param gpacnt
 291  *      Number of elements in iov
 292  * @param data
 293  *      Pointer to the buffer additional data to send
 294  * @param dlen
 295  *       Maximum size of what the the buffer will hold
 296  * @param xact
 297  *      Identifier of the request
 298  * @param flags
 299  *      Message type inband, rxbuf, gpa
 300  * @param need_sig
 301  *      Is host signal tx is required (optional)
 302  *
 303  * Sends data in buffer directly to hyper-v via the vmbus
 304  */
 305 int rte_vmbus_chan_send_sglist(struct vmbus_channel *channel,
 306                                struct vmbus_gpa gpa[], uint32_t gpacnt,
 307                                void *data, uint32_t dlen,
 308                                uint64_t xact, bool *need_sig);
 309 /**
 310  * Receive response to request on the given channel
 311  * skips the channel header.
 312  *
 313  * @param channel
 314  *      Pointer to vmbus_channel structure.
 315  * @param data
 316  *      Pointer to the buffer you want to receive the data into.
 317  * @param len
 318  *      Pointer to size of receive buffer (in/out)
 319  * @param
 320  *      Pointer to received transaction_id
 321  * @return
 322  *   On success, returns 0
 323  *   On failure, returns negative errno.
 324  */
 325 int rte_vmbus_chan_recv(struct vmbus_channel *chan,
 326                         void *data, uint32_t *len,
 327                         uint64_t *request_id);
 328
 329 /**
 330  * Receive response to request on the given channel
 331  * includes the channel header.
 332  *
 333  * @param channel
 334  *      Pointer to vmbus_channel structure.
 335  * @param data
 336  *      Pointer to the buffer you want to receive the data into.
 337  * @param len
 338  *      Pointer to size of receive buffer (in/out)
 339  * @return
 340  *   On success, returns number of bytes read.
 341  *   On failure, returns negative errno.
 342  */
 343 int rte_vmbus_chan_recv_raw(struct vmbus_channel *chan,
 344                             void *data, uint32_t *len);
 345
 346 /**
 347  * Notify host of bytes read (after recv_raw)
 348  * Signals host if required.
 349  *
 350  * @param channel
 351  *      Pointer to vmbus_channel structure.
 352  * @param bytes_read
 353  *      Number of bytes read since last signal
 354  */
 355 void rte_vmbus_chan_signal_read(struct vmbus_channel *chan, uint32_t bytes_read);
 356
 357 /**
 358  * Determine sub channel index of the given channel
 359  *
 360  * @param channel
 361  *      Pointer to vmbus_channel structure.
 362  * @return
 363  *   Sub channel index (0 for primary)
 364  */
 365 uint16_t rte_vmbus_sub_channel_index(const struct vmbus_channel *chan);
 366
 367 /**
 368  * Register a VMBUS driver.
 369  *
 370  * @param driver
 371  *   A pointer to a rte_vmbus_driver structure describing the driver
 372  *   to be registered.
 373  */
 374 void rte_vmbus_register(struct rte_vmbus_driver *driver);
 375
 376 /**
 377  * For debug dump contents of ring buffer.
 378  *
 379  * @param channel
 380  *      Pointer to vmbus_channel structure.
 381  */
 382 void rte_vmbus_chan_dump(FILE *f, const struct vmbus_channel *chan);
 383
 384 /**
 385  * Unregister a VMBUS driver.
 386  *
 387  * @param driver
 388  *   A pointer to a rte_vmbus_driver structure describing the driver
 389  *   to be unregistered.
 390  */
 391 void rte_vmbus_unregister(struct rte_vmbus_driver *driver);
 392
 393 /** Helper for VMBUS device registration from driver instance */
 394 #define RTE_PMD_REGISTER_VMBUS(nm, vmbus_drv)           \
 395         RTE_INIT(vmbusinitfn_ ##nm);                    \
 396         static void vmbusinitfn_ ##nm(void)             \
 397         {                                               \
 398                 (vmbus_drv).driver.name = RTE_STR(nm);  \
 399                 rte_vmbus_register(&vmbus_drv);         \
 400         }                                               \
 401         RTE_PMD_EXPORT_NAME(nm, __COUNTER__)
 402
 403 #ifdef __cplusplus
 404 }
 405 #endif
 406
 407 #endif /* _VMBUS_H_ */