summaryrefslogtreecommitdiffstats
path: root/replace/system/shmem.h
diff options
context:
space:
mode:
Diffstat (limited to 'replace/system/shmem.h')
0 files changed, 0 insertions, 0 deletions
generated by cgit (git 2.34.1) at 2026-02-19 11:21:50 +0000
' href='#n53'>53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
 * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
 *
 * VirtIO is a virtualization standard for network and disk device drivers
 * where just the guest's device driver "knows" it is running in a virtual
 * environment, and cooperates with the hypervisor. This enables guests to
 * get high performance network and disk operations, and gives most of the
 * performance benefits of paravirtualization. In the U-Boot case, the guest
 * is U-Boot itself, while the virtual environment are normally QEMU targets
 * like ARM, RISC-V and x86.
 *
 * See http://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v1.0.pdf for
 * the VirtIO specification v1.0.
 *
 * This file is largely based on Linux kernel virtio_*.h files
 */

#ifndef __VIRTIO_H__
#define __VIRTIO_H__

#define VIRTIO_ID_NET		1 /* virtio net */
#define VIRTIO_ID_BLOCK		2 /* virtio block */
#define VIRTIO_ID_MAX_NUM	3

#define VIRTIO_NET_DRV_NAME	"virtio-net"
#define VIRTIO_BLK_DRV_NAME	"virtio-blk"

/* Status byte for guest to report progress, and synchronize features */

/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
#define VIRTIO_CONFIG_S_ACKNOWLEDGE	1
/* We have found a driver for the device */
#define VIRTIO_CONFIG_S_DRIVER		2
/* Driver has used its parts of the config, and is happy */
#define VIRTIO_CONFIG_S_DRIVER_OK	4
/* Driver has finished configuring features */
#define VIRTIO_CONFIG_S_FEATURES_OK	8
/* Device entered invalid state, driver must reset it */
#define VIRTIO_CONFIG_S_NEEDS_RESET	0x40
/* We've given up on this device */
#define VIRTIO_CONFIG_S_FAILED		0x80

/*
 * Virtio feature bits VIRTIO_TRANSPORT_F_START through VIRTIO_TRANSPORT_F_END
 * are reserved for the transport being used (eg: virtio_ring, virtio_pci etc.),
 * the rest are per-device feature bits.
 */
#define VIRTIO_TRANSPORT_F_START	28
#define VIRTIO_TRANSPORT_F_END		38

#ifndef VIRTIO_CONFIG_NO_LEGACY
/*
 * Do we get callbacks when the ring is completely used,
 * even if we've suppressed them?
 */
#define VIRTIO_F_NOTIFY_ON_EMPTY	24

/* Can the device handle any descriptor layout? */
#define VIRTIO_F_ANY_LAYOUT		27
#endif /* VIRTIO_CONFIG_NO_LEGACY */

/* v1.0 compliant */
#define VIRTIO_F_VERSION_1		32

/*
 * If clear - device has the IOMMU bypass quirk feature.
 * If set - use platform tools to detect the IOMMU.
 *
 * Note the reverse polarity (compared to most other features),
 * this is for compatibility with legacy systems.
 */
#define VIRTIO_F_IOMMU_PLATFORM		33

/* Does the device support Single Root I/O Virtualization? */
#define VIRTIO_F_SR_IOV			37

/**
 * virtio scatter-gather struct
 *
 * @addr:		sg buffer address
 * @lengh:		sg buffer length
 */
struct virtio_sg {
	void *addr;
	size_t length;
};

struct virtqueue;

/* virtio bus operations */
struct dm_virtio_ops {
	/**
	 * get_config() - read the value of a configuration field
	 *
	 * @vdev:	the real virtio device
	 * @offset:	the offset of the configuration field
	 * @buf:	the buffer to write the field value into
	 * @len:	the length of the buffer
	 * @return 0 if OK, -ve on error
	 */
	int (*get_config)(struct udevice *vdev, unsigned int offset,
			  void *buf, unsigned int len);
	/**
	 * set_config() - write the value of a configuration field
	 *
	 * @vdev:	the real virtio device
	 * @offset:	the offset of the configuration field
	 * @buf:	the buffer to read the field value from
	 * @len:	the length of the buffer
	 * @return 0 if OK, -ve on error
	 */
	int (*set_config)(struct udevice *vdev, unsigned int offset,
			  const void *buf, unsigned int len);
	/**
	 * generation() - config generation counter
	 *
	 * @vdev:	the real virtio device
	 * @counter:	the returned config generation counter
	 * @return 0 if OK, -ve on error
	 */
	int (*generation)(struct udevice *vdev, u32 *counter);
	/**
	 * get_status() - read the status byte
	 *
	 * @vdev:	the real virtio device
	 * @status:	the returned status byte
	 * @return 0 if OK, -ve on error
	 */
	int (*get_status)(struct udevice *vdev, u8 *status);
	/**
	 * set_status() - write the status byte
	 *
	 * @vdev:	the real virtio device
	 * @status:	the new status byte
	 * @return 0 if OK, -ve on error
	 */
	int (*set_status)(struct udevice *vdev, u8 status);
	/**
	 * reset() - reset the device
	 *
	 * @vdev:	the real virtio device
	 * @return 0 if OK, -ve on error
	 */
	int (*reset)(struct udevice *vdev);
	/**
	 * get_features() - get the array of feature bits for this device
	 *
	 * @vdev:	the real virtio device
	 * @features:	the first 32 feature bits (all we currently need)
	 * @return 0 if OK, -ve on error
	 */
	int (*get_features)(struct udevice *vdev, u64 *features);
	/**
	 * set_features() - confirm what device features we'll be using
	 *
	 * @vdev:	the real virtio device
	 * @return 0 if OK, -ve on error
	 */
	int (*set_features)(struct udevice *vdev);
	/**
	 * find_vqs() - find virtqueues and instantiate them
	 *
	 * @vdev:	the real virtio device
	 * @nvqs:	the number of virtqueues to find
	 * @vqs:	on success, includes new virtqueues
	 * @return 0 if OK, -ve on error
	 */
	int (*find_vqs)(struct udevice *vdev, unsigned int nvqs,
			struct virtqueue *vqs[]);
	/**
	 * del_vqs() - free virtqueues found by find_vqs()
	 *
	 * @vdev:	the real virtio device
	 * @return 0 if OK, -ve on error
	 */
	int (*del_vqs)(struct udevice *vdev);
	/**
	 * notify() - notify the device to process the queue
	 *
	 * @vdev:	the real virtio device
	 * @vq:		virtqueue to process
	 * @return 0 if OK, -ve on error
	 */
	int (*notify)(struct udevice *vdev, struct virtqueue *vq);
};

/* Get access to a virtio bus' operations */
#define virtio_get_ops(dev)	((struct dm_virtio_ops *)(dev)->driver->ops)

/**
 * virtio uclass per device private data
 *
 * @vqs:			virtualqueue for the virtio device
 * @vdev:			the real virtio device underneath
 * @legacy:			is it a legacy device?
 * @device:			virtio device ID
 * @vendor:			virtio vendor ID
 * @features:			negotiated supported features
 * @feature_table:		an array of feature supported by the driver
 * @feature_table_size:		number of entries in the feature table array
 * @feature_table_legacy:	same as feature_table but working in legacy mode
 * @feature_table_size_legacy:	number of entries in feature table legacy array
 */
struct virtio_dev_priv {
	struct list_head vqs;
	struct udevice *vdev;
	bool legacy;
	u32 device;
	u32 vendor;
	u64 features;
	const u32 *feature_table;
	u32 feature_table_size;
	const u32 *feature_table_legacy;
	u32 feature_table_size_legacy;
};

/**
 * virtio_get_config() - read the value of a configuration field
 *
 * @vdev:	the real virtio device
 * @offset:	the offset of the configuration field
 * @buf:	the buffer to write the field value into
 * @len:	the length of the buffer