virtio_blk.c 3.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
  4. * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
  5. */
  6. #include <common.h>
  7. #include <blk.h>
  8. #include <dm.h>
  9. #include <part.h>
  10. #include <virtio_types.h>
  11. #include <virtio.h>
  12. #include <virtio_ring.h>
  13. #include "virtio_blk.h"
  14. struct virtio_blk_priv {
  15. struct virtqueue *vq;
  16. };
  17. static ulong virtio_blk_do_req(struct udevice *dev, u64 sector,
  18. lbaint_t blkcnt, void *buffer, u32 type)
  19. {
  20. struct virtio_blk_priv *priv = dev_get_priv(dev);
  21. unsigned int num_out = 0, num_in = 0;
  22. struct virtio_sg *sgs[3];
  23. u8 status;
  24. int ret;
  25. struct virtio_blk_outhdr out_hdr = {
  26. .type = cpu_to_virtio32(dev, type),
  27. .sector = cpu_to_virtio64(dev, sector),
  28. };
  29. struct virtio_sg hdr_sg = { &out_hdr, sizeof(out_hdr) };
  30. struct virtio_sg data_sg = { buffer, blkcnt * 512 };
  31. struct virtio_sg status_sg = { &status, sizeof(status) };
  32. sgs[num_out++] = &hdr_sg;
  33. if (type & VIRTIO_BLK_T_OUT)
  34. sgs[num_out++] = &data_sg;
  35. else
  36. sgs[num_out + num_in++] = &data_sg;
  37. sgs[num_out + num_in++] = &status_sg;
  38. ret = virtqueue_add(priv->vq, sgs, num_out, num_in);
  39. if (ret)
  40. return ret;
  41. virtqueue_kick(priv->vq);
  42. while (!virtqueue_get_buf(priv->vq, NULL))
  43. ;
  44. return status == VIRTIO_BLK_S_OK ? blkcnt : -EIO;
  45. }
  46. static ulong virtio_blk_read(struct udevice *dev, lbaint_t start,
  47. lbaint_t blkcnt, void *buffer)
  48. {
  49. return virtio_blk_do_req(dev, start, blkcnt, buffer,
  50. VIRTIO_BLK_T_IN);
  51. }
  52. static ulong virtio_blk_write(struct udevice *dev, lbaint_t start,
  53. lbaint_t blkcnt, const void *buffer)
  54. {
  55. return virtio_blk_do_req(dev, start, blkcnt, (void *)buffer,
  56. VIRTIO_BLK_T_OUT);
  57. }
  58. static int virtio_blk_bind(struct udevice *dev)
  59. {
  60. struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
  61. struct blk_desc *desc = dev_get_uclass_platdata(dev);
  62. int devnum;
  63. desc->if_type = IF_TYPE_VIRTIO;
  64. /*
  65. * Initialize the devnum to -ENODEV. This is to make sure that
  66. * blk_next_free_devnum() works as expected, since the default
  67. * value 0 is a valid devnum.
  68. */
  69. desc->devnum = -ENODEV;
  70. devnum = blk_next_free_devnum(IF_TYPE_VIRTIO);
  71. if (devnum < 0)
  72. return devnum;
  73. desc->devnum = devnum;
  74. desc->part_type = PART_TYPE_UNKNOWN;
  75. /*
  76. * virtio mmio transport supplies string identification for us,
  77. * while pci trnasport uses a 2-byte subvendor value.
  78. */
  79. if (uc_priv->vendor >> 16)
  80. sprintf(desc->vendor, "%s", (char *)&uc_priv->vendor);
  81. else
  82. sprintf(desc->vendor, "%04x", uc_priv->vendor);
  83. desc->bdev = dev;
  84. /* Indicate what driver features we support */
  85. virtio_driver_features_init(uc_priv, NULL, 0, NULL, 0);
  86. return 0;
  87. }
  88. static int virtio_blk_probe(struct udevice *dev)
  89. {
  90. struct virtio_blk_priv *priv = dev_get_priv(dev);
  91. struct blk_desc *desc = dev_get_uclass_platdata(dev);
  92. u64 cap;
  93. int ret;
  94. ret = virtio_find_vqs(dev, 1, &priv->vq);
  95. if (ret)
  96. return ret;
  97. desc->blksz = 512;
  98. virtio_cread(dev, struct virtio_blk_config, capacity, &cap);
  99. desc->lba = cap;
  100. return 0;
  101. }
  102. static const struct blk_ops virtio_blk_ops = {
  103. .read = virtio_blk_read,
  104. .write = virtio_blk_write,
  105. };
  106. U_BOOT_DRIVER(virtio_blk) = {
  107. .name = VIRTIO_BLK_DRV_NAME,
  108. .id = UCLASS_BLK,
  109. .ops = &virtio_blk_ops,
  110. .bind = virtio_blk_bind,
  111. .probe = virtio_blk_probe,
  112. .remove = virtio_reset,
  113. .priv_auto_alloc_size = sizeof(struct virtio_blk_priv),
  114. .flags = DM_FLAG_ACTIVE_DMA,
  115. };