SATA drives may support write same via SCT. This is useful for setting the drive contents to a specific pattern (0's).
Signed-off-by: Shaun Tancheff <[email protected]> --- v2: - Remove fugly ata hacking from sd.c --- drivers/ata/libata-scsi.c | 34 ++++++++++++++++++++++++++++++++++ drivers/scsi/sd.c | 2 +- include/linux/ata.h | 43 +++++++++++++++++++++++++++++++++++++++++++ include/scsi/scsi_device.h | 1 + 4 files changed, 79 insertions(+), 1 deletion(-) diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index bfec66f..b73eace 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -1204,6 +1204,9 @@ static int ata_scsi_dev_config(struct scsi_device *sdev, if (!ata_id_has_unload(dev->id)) dev->flags |= ATA_DFLAG_NO_UNLOAD; + if (ata_id_sct_write_same(dev->id)) + sdev->sct_write_same = 1; + /* configure max sectors */ blk_queue_max_hw_sectors(q, dev->max_sectors); @@ -3305,6 +3308,37 @@ static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) goto invalid_param_len; buf = page_address(sg_page(scsi_sglist(scmd))); + + if (ata_id_sct_write_same(dev->id)) { + u16 *sctpg = buf; + + put_unaligned_le16(0x0002, &sctpg[0]); /* SCT_ACT_WRITE_SAME */ + put_unaligned_le16(0x0101, &sctpg[1]); /* WRITE PTRN FG */ + put_unaligned_le64(block, &sctpg[2]); + put_unaligned_le64(n_block, &sctpg[6]); + put_unaligned_le32(0u, &sctpg[10]); + + tf->hob_feature = 0; + tf->feature = 0; + tf->hob_nsect = 0; + tf->nsect = 1; + tf->lbah = 0; + tf->lbam = 0; + tf->lbal = ATA_CMD_STANDBYNOW1; + tf->hob_lbah = 0; + tf->hob_lbam = 0; + tf->hob_lbal = 0; + tf->device = ATA_CMD_STANDBYNOW1; + tf->protocol = ATA_PROT_DMA; + tf->command = ATA_CMD_WRITE_LOG_DMA_EXT; + tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | + ATA_TFLAG_LBA48 | ATA_TFLAG_WRITE; + + ata_qc_set_pc_nbytes(qc); + + return 0; + } + size = ata_set_lba_range_entries(buf, 512, block, n_block); if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index f459dff..b5ffcd3 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -794,7 +794,7 @@ static void sd_config_write_same(struct scsi_disk *sdkp) struct request_queue *q = sdkp->disk->queue; unsigned int logical_block_size = sdkp->device->sector_size; - if (sdkp->device->no_write_same) { + if (sdkp->device->no_write_same && !sdkp->device->sct_write_same) { sdkp->max_ws_blocks = 0; goto out; } diff --git a/include/linux/ata.h b/include/linux/ata.h index 99346be..4132de3 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -104,6 +104,7 @@ enum { ATA_ID_CFA_KEY_MGMT = 162, ATA_ID_CFA_MODES = 163, ATA_ID_DATA_SET_MGMT = 169, + ATA_ID_SCT_CMD_XPORT = 206, ATA_ID_ROT_SPEED = 217, ATA_ID_PIO4 = (1 << 1), @@ -778,6 +779,48 @@ static inline bool ata_id_sense_reporting_enabled(const u16 *id) } /** + * + * Word: 206 - SCT Command Transport + * 15:12 - Vendor Specific + * 11:6 - Reserved + * 5 - SCT Command Transport Data Tables supported + * 4 - SCT Command Transport Features Control supported + * 3 - SCT Command Transport Error Recovery Control supported + * 2 - SCT Command Transport Write Same supported + * 1 - SCT Command Transport Long Sector Access supported + * 0 - SCT Command Transport supported + */ +static inline bool ata_id_sct_data_tables(const u16 *id) +{ + return id[ATA_ID_SCT_CMD_XPORT] & (1 << 5) ? true : false; +} + +static inline bool ata_id_sct_features_ctrl(const u16 *id) +{ + return id[ATA_ID_SCT_CMD_XPORT] & (1 << 4) ? true : false; +} + +static inline bool ata_id_sct_error_recovery_ctrl(const u16 *id) +{ + return id[ATA_ID_SCT_CMD_XPORT] & (1 << 3) ? true : false; +} + +static inline bool ata_id_sct_write_same(const u16 *id) +{ + return id[ATA_ID_SCT_CMD_XPORT] & (1 << 2) ? true : false; +} + +static inline bool ata_id_sct_long_sector_access(const u16 *id) +{ + return id[ATA_ID_SCT_CMD_XPORT] & (1 << 1) ? true : false; +} + +static inline bool ata_id_sct_supported(const u16 *id) +{ + return id[ATA_ID_SCT_CMD_XPORT] & (1 << 0) ? true : false; +} + +/** * ata_id_major_version - get ATA level of drive * @id: Identify data * diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index a6c346d..66f5af7 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -157,6 +157,7 @@ struct scsi_device { unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ unsigned no_write_same:1; /* no WRITE SAME command */ + unsigned sct_write_same:1; /* Has WRITE SAME via SCT Command */ unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ -- 2.8.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
