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libata: Add support for SCT Write Same
SATA drives may support write same via SCT. This is useful for setting the drive contents to a specific pattern (0's). Translate a SCSI WRITE SAME 16 command to be either a DSM TRIM command or an SCT Write Same command. Based on the UNMAP flag: - When set translate to DSM TRIM - When not set translate to SCT Write Same Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Acked-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Shaun Tancheff
Tejun Heo
parent
9379e6b8e0
commit
7b20309428
@ -1159,8 +1159,6 @@ static void ata_scsi_sdev_config(struct scsi_device *sdev)
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{
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sdev->use_10_for_rw = 1;
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sdev->use_10_for_ms = 1;
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sdev->no_report_opcodes = 1;
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sdev->no_write_same = 1;
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/* Schedule policy is determined by ->qc_defer() callback and
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* it needs to see every deferred qc. Set dev_blocked to 1 to
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@ -3287,7 +3285,7 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
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* @cmd: SCSI command being translated
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* @num: Maximum number of entries (nominally 64).
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* @sector: Starting sector
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* @count: Total Range of request
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* @count: Total Range of request in logical sectors
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*
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* Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted
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* descriptor.
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@ -3330,6 +3328,45 @@ static unsigned int ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 num,
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return used_bytes;
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}
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/**
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* ata_format_dsm_trim_descr() - SATL Write Same to ATA SCT Write Same
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* @cmd: SCSI command being translated
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* @lba: Starting sector
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* @num: Number of logical sectors to be zero'd.
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*
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* Rewrite the WRITE SAME descriptor to be an SCT Write Same formatted
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* descriptor.
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* NOTE: Writes a pattern (0's) in the foreground.
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* Large write-same requents can timeout.
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*/
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static void ata_format_sct_write_same(struct scsi_cmnd *cmd, u64 lba, u64 num)
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{
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u16 *sctpg;
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unsigned long flags;
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spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
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sctpg = ((void *)ata_scsi_rbuf);
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put_unaligned_le16(0x0002, &sctpg[0]); /* SCT_ACT_WRITE_SAME */
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put_unaligned_le16(0x0101, &sctpg[1]); /* WRITE PTRN FG */
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put_unaligned_le64(lba, &sctpg[2]);
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put_unaligned_le64(num, &sctpg[6]);
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put_unaligned_le32(0u, &sctpg[10]);
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sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), sctpg, 512);
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spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags);
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}
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/**
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* ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same
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* @qc: Command to be translated
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*
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* Translate a SCSI WRITE SAME command to be either a DSM TRIM command or
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* an SCT Write Same command.
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* Based on WRITE SAME has the UNMAP flag
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* When set translate to DSM TRIM
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* When clear translate to SCT Write Same
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*/
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static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
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{
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struct ata_taskfile *tf = &qc->tf;
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@ -3342,6 +3379,7 @@ static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
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u32 size;
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u16 fp;
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u8 bp = 0xff;
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u8 unmap = cdb[1] & 0x8;
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/* we may not issue DMA commands if no DMA mode is set */
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if (unlikely(!dev->dma_mode))
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@ -3353,11 +3391,26 @@ static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
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}
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scsi_16_lba_len(cdb, &block, &n_block);
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/* for now we only support WRITE SAME with the unmap bit set */
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if (unlikely(!(cdb[1] & 0x8))) {
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fp = 1;
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bp = 3;
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goto invalid_fld;
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if (unmap) {
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/* If trim is not enabled the cmd is invalid. */
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if ((dev->horkage & ATA_HORKAGE_NOTRIM) ||
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!ata_id_has_trim(dev->id)) {
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fp = 1;
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bp = 3;
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goto invalid_fld;
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}
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/* If the request is too large the cmd is invalid */
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if (n_block > 0xffff * trmax) {
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fp = 2;
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goto invalid_fld;
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}
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} else {
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/* If write same is not available the cmd is invalid */
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if (!ata_id_sct_write_same(dev->id)) {
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fp = 1;
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bp = 3;
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goto invalid_fld;
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}
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}
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/*
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@ -3367,30 +3420,42 @@ static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
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if (!scsi_sg_count(scmd))
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goto invalid_param_len;
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if (n_block <= 0xffff * trmax) {
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if (unmap) {
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size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block);
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} else {
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fp = 2;
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goto invalid_fld;
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}
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if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
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/* Newer devices support queued TRIM commands */
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tf->protocol = ATA_PROT_NCQ;
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tf->command = ATA_CMD_FPDMA_SEND;
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tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
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tf->nsect = qc->tag << 3;
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tf->hob_feature = (size / 512) >> 8;
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tf->feature = size / 512;
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if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
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/* Newer devices support queued TRIM commands */
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tf->protocol = ATA_PROT_NCQ;
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tf->command = ATA_CMD_FPDMA_SEND;
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tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
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tf->nsect = qc->tag << 3;
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tf->hob_feature = (size / 512) >> 8;
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tf->feature = size / 512;
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tf->auxiliary = 1;
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tf->auxiliary = 1;
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} else {
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tf->protocol = ATA_PROT_DMA;
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tf->hob_feature = 0;
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tf->feature = ATA_DSM_TRIM;
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tf->hob_nsect = (size / 512) >> 8;
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tf->nsect = size / 512;
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tf->command = ATA_CMD_DSM;
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}
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} else {
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tf->protocol = ATA_PROT_DMA;
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ata_format_sct_write_same(scmd, block, n_block);
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tf->hob_feature = 0;
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tf->feature = ATA_DSM_TRIM;
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tf->hob_nsect = (size / 512) >> 8;
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tf->nsect = size / 512;
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tf->command = ATA_CMD_DSM;
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tf->feature = 0;
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tf->hob_nsect = 0;
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tf->nsect = 1;
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tf->lbah = 0;
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tf->lbam = 0;
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tf->lbal = ATA_CMD_STANDBYNOW1;
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tf->hob_lbah = 0;
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tf->hob_lbam = 0;
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tf->hob_lbal = 0;
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tf->device = ATA_CMD_STANDBYNOW1;
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tf->protocol = ATA_PROT_DMA;
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tf->command = ATA_CMD_WRITE_LOG_DMA_EXT;
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}
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tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
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@ -3413,6 +3478,76 @@ invalid_opcode:
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return 1;
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}
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/**
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* ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN
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* @args: device MAINTENANCE_IN data / SCSI command of interest.
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* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
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*
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* Yields a subset to satisfy scsi_report_opcode()
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*
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* LOCKING:
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* spin_lock_irqsave(host lock)
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*/
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static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf)
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{
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struct ata_device *dev = args->dev;
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u8 *cdb = args->cmd->cmnd;
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u8 supported = 0;
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unsigned int err = 0;
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if (cdb[2] != 1) {
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ata_dev_warn(dev, "invalid command format %d\n", cdb[2]);
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err = 2;
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goto out;
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}
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switch (cdb[3]) {
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case INQUIRY:
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case MODE_SENSE:
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case MODE_SENSE_10:
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case READ_CAPACITY:
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case SERVICE_ACTION_IN_16:
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case REPORT_LUNS:
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case REQUEST_SENSE:
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case SYNCHRONIZE_CACHE:
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case REZERO_UNIT:
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case SEEK_6:
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case SEEK_10:
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case TEST_UNIT_READY:
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case SEND_DIAGNOSTIC:
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case MAINTENANCE_IN:
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case READ_6:
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case READ_10:
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case READ_16:
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case WRITE_6:
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case WRITE_10:
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case WRITE_16:
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case ATA_12:
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case ATA_16:
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case VERIFY:
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case VERIFY_16:
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case MODE_SELECT:
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case MODE_SELECT_10:
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case START_STOP:
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supported = 3;
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break;
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case WRITE_SAME_16:
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if (ata_id_sct_write_same(dev->id))
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supported = 3;
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break;
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case ZBC_IN:
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case ZBC_OUT:
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if (ata_id_zoned_cap(dev->id) ||
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dev->class == ATA_DEV_ZAC)
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supported = 3;
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break;
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default:
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break;
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}
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out:
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rbuf[1] = supported; /* supported */
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return err;
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}
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/**
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* ata_scsi_report_zones_complete - convert ATA output
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* @qc: command structure returning the data
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@ -4193,6 +4328,13 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
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ata_scsi_invalid_field(dev, cmd, 1);
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break;
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case MAINTENANCE_IN:
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if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES)
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ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in);
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else
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ata_scsi_invalid_field(dev, cmd, 1);
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break;
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/* all other commands */
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default:
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ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0);
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@ -4225,7 +4367,6 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
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shost->max_lun = 1;
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shost->max_channel = 1;
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shost->max_cmd_len = 16;
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shost->no_write_same = 1;
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/* Schedule policy is determined by ->qc_defer()
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* callback and it needs to see every deferred qc.
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@ -105,6 +105,7 @@ enum {
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ATA_ID_CFA_KEY_MGMT = 162,
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ATA_ID_CFA_MODES = 163,
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ATA_ID_DATA_SET_MGMT = 169,
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ATA_ID_SCT_CMD_XPORT = 206,
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ATA_ID_ROT_SPEED = 217,
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ATA_ID_PIO4 = (1 << 1),
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@ -788,6 +789,48 @@ static inline bool ata_id_sense_reporting_enabled(const u16 *id)
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return id[ATA_ID_COMMAND_SET_4] & (1 << 6);
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}
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/**
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*
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* Word: 206 - SCT Command Transport
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* 15:12 - Vendor Specific
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* 11:6 - Reserved
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* 5 - SCT Command Transport Data Tables supported
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* 4 - SCT Command Transport Features Control supported
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* 3 - SCT Command Transport Error Recovery Control supported
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* 2 - SCT Command Transport Write Same supported
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* 1 - SCT Command Transport Long Sector Access supported
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* 0 - SCT Command Transport supported
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*/
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static inline bool ata_id_sct_data_tables(const u16 *id)
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{
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return id[ATA_ID_SCT_CMD_XPORT] & (1 << 5) ? true : false;
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}
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static inline bool ata_id_sct_features_ctrl(const u16 *id)
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{
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return id[ATA_ID_SCT_CMD_XPORT] & (1 << 4) ? true : false;
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}
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static inline bool ata_id_sct_error_recovery_ctrl(const u16 *id)
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{
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return id[ATA_ID_SCT_CMD_XPORT] & (1 << 3) ? true : false;
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}
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static inline bool ata_id_sct_write_same(const u16 *id)
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{
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return id[ATA_ID_SCT_CMD_XPORT] & (1 << 2) ? true : false;
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}
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static inline bool ata_id_sct_long_sector_access(const u16 *id)
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{
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return id[ATA_ID_SCT_CMD_XPORT] & (1 << 1) ? true : false;
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}
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static inline bool ata_id_sct_supported(const u16 *id)
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{
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return id[ATA_ID_SCT_CMD_XPORT] & (1 << 0) ? true : false;
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}
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/**
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* ata_id_major_version - get ATA level of drive
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* @id: Identify data
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