linux-kernel - [PATCH RFC v2 06/18] libata-scsi: Add ata_scsi_queue

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Date:   Thu, 9 Jun 2022 18:29:07 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>, <damien.lemoal@...nsource.wdc.com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <brking@...ibm.com>, <hare@...e.de>, <hch@....de>
CC:     <linux-block@...r.kernel.org>, <linux-ide@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <chenxiang66@...ilicon.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH RFC v2 06/18] libata-scsi: Add ata_scsi_queue_internal()

Add a function to handle queued ATA internal SCSI cmnds - does much the
same as ata_exec_internal_sg() does (which will be fixed up later to
actually queue internal cmnds through this function).

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/ata/libata-scsi.c | 47 ++++++++++++++++++++++++++++++++++++++-
 include/linux/libata.h    |  6 +++++
 2 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 42cecf95a4e5..baac35dd17ca 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3963,6 +3963,49 @@ static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
 	return NULL;
 }
 
+static unsigned int ata_scsi_queue_internal(struct scsi_cmnd *scmd,
+					    struct ata_device *dev)
+{
+	struct ata_link *link = dev->link;
+	struct ata_port *ap = link->ap;
+	struct ata_queued_cmd *qc;
+
+	/* no internal command while frozen */
+	if (ap->pflags & ATA_PFLAG_FROZEN)
+		goto did_err;
+
+	/* initialize internal qc */
+	qc = __ata_qc_from_tag(ap, ATA_TAG_INTERNAL);
+	link->preempted_tag = link->active_tag;
+	link->preempted_sactive = link->sactive;
+	ap->preempted_qc_active = ap->qc_active;
+	ap->preempted_nr_active_links = ap->nr_active_links;
+	link->active_tag = ATA_TAG_POISON;
+	link->sactive = 0;
+	ap->qc_active = 0;
+	ap->nr_active_links = 0;
+
+	if (qc->dma_dir != DMA_NONE) {
+		int n_elem;
+
+		n_elem = 1;
+		qc->n_elem = n_elem;
+		qc->sg = scsi_sglist(scmd);
+		qc->nbytes = qc->sg->length;
+		ata_sg_init(qc, qc->sg, n_elem);
+	}
+
+	scmd->submitter = SUBMITTED_BY_BLOCK_LAYER;
+
+	ata_qc_issue(qc);
+
+	return 0;
+did_err:
+	scmd->result = (DID_ERROR << 16);
+	scsi_done(scmd);
+	return 0;
+}
+
 int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)
 {
 	u8 scsi_op = scmd->cmnd[0];
@@ -3971,7 +4014,9 @@ int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)
 	if (unlikely(!scmd->cmd_len))
 		goto bad_cdb_len;
 
-	if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
+	if (scsi_is_reserved_cmd(scmd)) {
+		return ata_scsi_queue_internal(scmd, dev);
+	} else if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
 		if (unlikely(scmd->cmd_len > dev->cdb_len))
 			goto bad_cdb_len;
 
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 732de9014626..43f4bcfe9a5f 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -767,7 +767,9 @@ struct ata_link {
 
 	struct device		tdev;
 	unsigned int		active_tag;	/* active tag on this link */
+	unsigned int		preempted_tag;
 	u32			sactive;	/* active NCQ commands */
+	u32			preempted_sactive;
 
 	unsigned int		flags;		/* ATA_LFLAG_xxx */
 
@@ -861,6 +863,10 @@ struct ata_port {
 #ifdef CONFIG_ATA_ACPI
 	struct ata_acpi_gtm	__acpi_init_gtm; /* use ata_acpi_init_gtm() */
 #endif
+
+	u64 preempted_qc_active;
+	int preempted_nr_active_links;
+
 	/* owned by EH */
 	u8			sector_buf[ATA_SECT_SIZE] ____cacheline_aligned;
 };
-- 
2.26.2