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    Subject[PATCH 5/5] libata: Add support for TRIM
    Date
    Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
    ---
    drivers/ata/libata-scsi.c | 46 +++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 46 insertions(+), 0 deletions(-)

    diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
    index b9747fa..d4c8b8b 100644
    --- a/drivers/ata/libata-scsi.c
    +++ b/drivers/ata/libata-scsi.c
    @@ -1029,6 +1029,46 @@ static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
    desc[11] = block;
    }

    +static int ata_discard_fn(struct request_queue *q, struct request *req,
    + struct bio *bio)
    +{
    + unsigned size;
    + struct page *page = alloc_page(GFP_KERNEL);
    + if (!page)
    + goto error;
    +
    + size = ata_set_lba_range_entries(page_address(page), PAGE_SIZE / 8,
    + bio->bi_sector, bio_sectors(bio));
    + bio->bi_size = 0;
    + if (bio_add_pc_page(q, bio, page, size, 0) < size)
    + goto free_page;
    +
    + req->cmd_type = REQ_TYPE_BLOCK_PC;
    + req->cmd_len = 16;
    + req->cmd[0] = ATA_16;
    + req->cmd[1] = (6 << 1) | 1; /* dma, 48-bit */
    + req->cmd[2] = 0x6; /* length, direction */
    + req->cmd[3] = 0; /* feature high */
    + req->cmd[4] = ATA_DSM_TRIM; /* feature low */
    + req->cmd[5] = (size / 512) >> 8; /* nsect high */
    + req->cmd[6] = size / 512; /* nsect low */
    + req->cmd[7] = 0; /* lba */
    + req->cmd[8] = 0; /* lba */
    + req->cmd[9] = 0; /* lba */
    + req->cmd[10] = 0; /* lba */
    + req->cmd[11] = 0; /* lba */
    + req->cmd[12] = 0; /* lba */
    + req->cmd[13] = ATA_LBA; /* device */
    + req->cmd[14] = ATA_CMD_DSM; /* command */
    + req->cmd[15] = 0; /* control */
    +
    + return 0;
    + free_page:
    + __free_page(page);
    + error:
    + return -ENOMEM;
    +}
    +
    static void ata_scsi_sdev_config(struct scsi_device *sdev)
    {
    sdev->use_10_for_rw = 1;
    @@ -1077,6 +1117,9 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
    /* configure max sectors */
    blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);

    + if (ata_id_has_trim(dev->id))
    + blk_queue_set_discard(sdev->request_queue, ata_discard_fn);
    +
    if (dev->class == ATA_DEV_ATAPI) {
    struct request_queue *q = sdev->request_queue;
    void *buf;
    @@ -2385,6 +2428,9 @@ static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
    /* sector size */
    rbuf[10] = ATA_SECT_SIZE >> 8;
    rbuf[11] = ATA_SECT_SIZE & 0xff;
    +
    + if (ata_id_has_trim(args->id))
    + rbuf[14] = 0x80;
    }

    return 0;
    --
    1.6.2.1


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