linux-kernel - [PATCH v3 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for SATA devices

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Message-ID: <20240302201636.1228331-3-ipylypiv@google.com>
Date: Sat,  2 Mar 2024 12:16:31 -0800
From: Igor Pylypiv <ipylypiv@...gle.com>
To: Damien Le Moal <dlemoal@...nel.org>, Niklas Cassel <cassel@...nel.org>, 
	John Garry <john.g.garry@...cle.com>, Jason Yan <yanaijie@...wei.com>, 
	"James E.J. Bottomley" <jejb@...ux.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>, 
	Jack Wang <jinpu.wang@...ud.ionos.com>, Hannes Reinecke <hare@...e.de>, 
	Xiang Chen <chenxiang66@...ilicon.com>, Artur Paszkiewicz <artur.paszkiewicz@...el.com>, 
	Bart Van Assche <bvanassche@....org>
Cc: TJ Adams <tadamsjr@...gle.com>, linux-ide@...r.kernel.org, 
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Igor Pylypiv <ipylypiv@...gle.com>
Subject: [PATCH v3 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for
 SATA devices

Libata sysfs attributes cannot be used for libsas managed SATA devices
because the ata_port location is different for libsas.

Defined sysfs attributes (visible for SATA devices only):
- /sys/block/sda/device/ncq_prio_enable
- /sys/block/sda/device/ncq_prio_supported

The newly defined attributes will pass the correct ata_port to libata
helper functions.

Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>
---
 drivers/scsi/libsas/sas_ata.c | 92 +++++++++++++++++++++++++++++++++++
 include/scsi/sas_ata.h        |  6 +++
 2 files changed, 98 insertions(+)

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 12e2653846e3..e4d07134a0e4 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -964,3 +964,95 @@ int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
 			       force_phy_id, &tmf_task);
 }
 EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
+
+static ssize_t sas_ncq_prio_supported_show(struct device *device,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct domain_device *ddev = sdev_to_domain_dev(sdev);
+	int rc;
+
+	/* This attribute shall be visible for SATA devices only */
+	if (WARN_ON(!dev_is_sata(ddev)))
+		return -EINVAL;
+
+	rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev);
+	if (rc < 0)
+		return rc;
+
+	return sysfs_emit(buf, "%d\n", rc);
+}
+
+DEVICE_ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
+
+static ssize_t sas_ncq_prio_enable_show(struct device *device,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct domain_device *ddev = sdev_to_domain_dev(sdev);
+	int rc;
+
+	/* This attribute shall be visible for SATA devices only */
+	if (WARN_ON(!dev_is_sata(ddev)))
+		return -EINVAL;
+
+	rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev);
+	if (rc < 0)
+		return rc;
+
+	return sysfs_emit(buf, "%d\n", rc);
+}
+
+static ssize_t sas_ncq_prio_enable_store(struct device *device,
+					 struct device_attribute *attr,
+					 const char *buf, size_t len)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct domain_device *ddev = sdev_to_domain_dev(sdev);
+	bool enable;
+	int rc;
+
+	/* This attribute shall be visible for SATA devices only */
+	if (WARN_ON(!dev_is_sata(ddev)))
+		return -EINVAL;
+
+	rc = kstrtobool(buf, &enable);
+	if (rc)
+		return rc;
+
+	rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
+	if (rc)
+		return rc;
+
+	return len;
+}
+
+DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
+	    sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
+
+static struct attribute *sas_ata_sdev_attrs[] = {
+	&dev_attr_ncq_prio_supported.attr,
+	&dev_attr_ncq_prio_enable.attr,
+	NULL
+};
+
+static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
+				       struct attribute *attr, int i)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct domain_device *ddev = sdev_to_domain_dev(sdev);
+
+	if (!dev_is_sata(ddev))
+		return 0;
+
+	return attr->mode;
+}
+
+const struct attribute_group sas_ata_sdev_attr_group = {
+	.attrs = sas_ata_sdev_attrs,
+	.is_visible = sas_ata_attr_is_visible,
+};
+EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);
diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
index 2f8c719840a6..cded782fdf33 100644
--- a/include/scsi/sas_ata.h
+++ b/include/scsi/sas_ata.h
@@ -39,6 +39,8 @@ int smp_ata_check_ready_type(struct ata_link *link);
 int sas_discover_sata(struct domain_device *dev);
 int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
 		    struct domain_device *child, int phy_id);
+
+extern const struct attribute_group sas_ata_sdev_attr_group;
 #else
 
 static inline void sas_ata_disabled_notice(void)
@@ -123,6 +125,10 @@ static inline int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *p
 	sas_ata_disabled_notice();
 	return -ENODEV;
 }
+
+static const struct attribute_group sas_ata_sdev_attr_group = {
+	.attrs = NULL,
+};
 #endif
 
 #endif /* _SAS_ATA_H_ */
-- 
2.44.0.278.ge034bb2e1d-goog