vdpa_sim_blk: add support for discard and write-zeroes
Expose VIRTIO_BLK_F_DISCARD and VIRTIO_BLK_F_WRITE_ZEROES features to the drivers and handle VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES requests checking ranges and flags. The simulator behaves like a ramdisk, so for VIRTIO_BLK_F_DISCARD does nothing, while for VIRTIO_BLK_T_WRITE_ZEROES sets to 0 the specified region. Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Message-Id: <20220811083632.77525-5-sgarzare@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -30,11 +30,14 @@
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(1ULL << VIRTIO_BLK_F_SEG_MAX) | \
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(1ULL << VIRTIO_BLK_F_BLK_SIZE) | \
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(1ULL << VIRTIO_BLK_F_TOPOLOGY) | \
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(1ULL << VIRTIO_BLK_F_MQ))
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(1ULL << VIRTIO_BLK_F_MQ) | \
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(1ULL << VIRTIO_BLK_F_DISCARD) | \
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(1ULL << VIRTIO_BLK_F_WRITE_ZEROES))
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#define VDPASIM_BLK_CAPACITY 0x40000
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#define VDPASIM_BLK_SIZE_MAX 0x1000
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#define VDPASIM_BLK_SEG_MAX 32
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#define VDPASIM_BLK_DWZ_MAX_SECTORS UINT_MAX
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/* 1 virtqueue, 1 address space, 1 virtqueue group */
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#define VDPASIM_BLK_VQ_NUM 1
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@ -193,6 +196,64 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
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/* nothing to do */
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break;
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case VIRTIO_BLK_T_DISCARD:
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case VIRTIO_BLK_T_WRITE_ZEROES: {
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struct virtio_blk_discard_write_zeroes range;
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u32 num_sectors, flags;
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if (to_pull != sizeof(range)) {
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dev_dbg(&vdpasim->vdpa.dev,
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"discard/write_zeroes header len: 0x%zx [expected: 0x%zx]\n",
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to_pull, sizeof(range));
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status = VIRTIO_BLK_S_IOERR;
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break;
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}
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bytes = vringh_iov_pull_iotlb(&vq->vring, &vq->out_iov, &range,
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to_pull);
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if (bytes < 0) {
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dev_dbg(&vdpasim->vdpa.dev,
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"vringh_iov_pull_iotlb() error: %zd offset: 0x%llx len: 0x%zx\n",
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bytes, offset, to_pull);
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status = VIRTIO_BLK_S_IOERR;
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break;
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}
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sector = le64_to_cpu(range.sector);
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offset = sector << SECTOR_SHIFT;
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num_sectors = le32_to_cpu(range.num_sectors);
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flags = le32_to_cpu(range.flags);
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if (type == VIRTIO_BLK_T_DISCARD && flags != 0) {
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dev_dbg(&vdpasim->vdpa.dev,
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"discard unexpected flags set - flags: 0x%x\n",
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flags);
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status = VIRTIO_BLK_S_UNSUPP;
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break;
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}
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if (type == VIRTIO_BLK_T_WRITE_ZEROES &&
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flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) {
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dev_dbg(&vdpasim->vdpa.dev,
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"write_zeroes unexpected flags set - flags: 0x%x\n",
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flags);
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status = VIRTIO_BLK_S_UNSUPP;
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break;
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}
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if (!vdpasim_blk_check_range(vdpasim, sector, num_sectors,
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VDPASIM_BLK_DWZ_MAX_SECTORS)) {
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status = VIRTIO_BLK_S_IOERR;
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break;
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}
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if (type == VIRTIO_BLK_T_WRITE_ZEROES) {
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memset(vdpasim->buffer + offset, 0,
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num_sectors << SECTOR_SHIFT);
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}
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break;
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}
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default:
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dev_dbg(&vdpasim->vdpa.dev,
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"Unsupported request type %d\n", type);
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@ -281,6 +342,17 @@ static void vdpasim_blk_get_config(struct vdpasim *vdpasim, void *config)
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blk_config->min_io_size = cpu_to_vdpasim16(vdpasim, 1);
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blk_config->opt_io_size = cpu_to_vdpasim32(vdpasim, 1);
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blk_config->blk_size = cpu_to_vdpasim32(vdpasim, SECTOR_SIZE);
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/* VIRTIO_BLK_F_DISCARD */
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blk_config->discard_sector_alignment =
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cpu_to_vdpasim32(vdpasim, SECTOR_SIZE);
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blk_config->max_discard_sectors =
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cpu_to_vdpasim32(vdpasim, VDPASIM_BLK_DWZ_MAX_SECTORS);
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blk_config->max_discard_seg = cpu_to_vdpasim32(vdpasim, 1);
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/* VIRTIO_BLK_F_WRITE_ZEROES */
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blk_config->max_write_zeroes_sectors =
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cpu_to_vdpasim32(vdpasim, VDPASIM_BLK_DWZ_MAX_SECTORS);
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blk_config->max_write_zeroes_seg = cpu_to_vdpasim32(vdpasim, 1);
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}
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static void vdpasim_blk_mgmtdev_release(struct device *dev)
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