linux-kernel - [PATCH RFC v2 07/18] libata-scsi: Add ata_internal

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Date:   Thu, 9 Jun 2022 18:29:08 +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 07/18] libata-scsi: Add ata_internal_queuecommand()

Add callback to queue reserved commands - call it "internal" as this is
what libata uses.

Also add it to the base ATA SHT, and set nr_reserved_cmds = 1, which
matches tag ATA_TAG_INTERNAL.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/ata/libata-scsi.c | 14 ++++++++++++++
 include/linux/libata.h    |  6 +++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index baac35dd17ca..b2702ab0183b 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1114,6 +1114,20 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
 	return 0;
 }
 
+int ata_internal_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
+{
+	struct ata_port *ap;
+	int res;
+
+	ap = ata_shost_to_port(shost);
+	spin_lock_irq(ap->lock);
+	res = ata_sas_queuecmd(scmd, ap);
+	spin_unlock_irq(ap->lock);
+
+	return res;
+}
+EXPORT_SYMBOL_GPL(ata_internal_queuecommand);
+
 /**
  *	ata_scsi_slave_config - Set SCSI device attributes
  *	@sdev: SCSI device to examine
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 43f4bcfe9a5f..5fa6f56bba81 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1141,6 +1141,8 @@ extern int ata_std_bios_param(struct scsi_device *sdev,
 			      sector_t capacity, int geom[]);
 extern void ata_scsi_unlock_native_capacity(struct scsi_device *sdev);
 extern int ata_scsi_slave_config(struct scsi_device *sdev);
+extern int ata_internal_queuecommand(struct Scsi_Host *shost,
+				struct scsi_cmnd *scmd);
 extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
 				       int queue_depth);
@@ -1390,7 +1392,9 @@ extern const struct attribute_group *ata_common_sdev_groups[];
 	.proc_name		= drv_name,			\
 	.slave_destroy		= ata_scsi_slave_destroy,	\
 	.bios_param		= ata_std_bios_param,		\
-	.unlock_native_capacity	= ata_scsi_unlock_native_capacity
+	.unlock_native_capacity	= ata_scsi_unlock_native_capacity,\
+	.nr_reserved_cmds = 1,\
+	.reserved_queuecommand = ata_internal_queuecommand
 
 #define ATA_SUBBASE_SHT(drv_name)				\
 	__ATA_BASE_SHT(drv_name),				\
-- 
2.26.2