From: Damien Le Moal <damien.lemoal@wdc.com>
To: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-ide@vger.kernel.org,
"Martin K . Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org
Cc: Sathya Prakash <sathya.prakash@broadcom.com>,
Sreekanth Reddy <sreekanth.reddy@broadcom.com>,
Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Subject: [PATCH v2 9/9] scsi: mpt3sas: Introduce sas_ncq_prio_supported sysfs sttribute
Date: Fri, 6 Aug 2021 16:42:52 +0900 [thread overview]
Message-ID: <20210806074252.398482-10-damien.lemoal@wdc.com> (raw)
In-Reply-To: <20210806074252.398482-1-damien.lemoal@wdc.com>
Similarly to AHCI, introduce the device sysfs attribute
sas_ncq_prio_supported to advertize if a SATA device supports the NCQ
priority feature. Without this new attribute, the user can only
discover if a SATA device supports NCQ priority by trying to enable
the feature use with the sas_ncq_prio_enable sysfs device attribute,
which fails when the device does not support high priroity commands.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/scsi/mpt3sas/mpt3sas_ctl.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
index b66140e4c370..f83d4d32d459 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
@@ -3918,6 +3918,24 @@ sas_device_handle_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(sas_device_handle);
+/**
+ * sas_ncq_prio_supported_show - Indicate if device supports NCQ priority
+ * @dev: pointer to embedded device
+ * @attr: sas_ncq_prio_supported attribute descriptor
+ * @buf: the buffer returned
+ *
+ * A sysfs 'read-only' sdev attribute, only works with SATA
+ */
+static ssize_t
+sas_ncq_prio_supported_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+
+ return sysfs_emit(buf, "%d\n", scsih_ncq_prio_supp(sdev));
+}
+static DEVICE_ATTR_RO(sas_ncq_prio_supported);
+
/**
* sas_ncq_prio_enable_show - send prioritized io commands to device
* @dev: pointer to embedded device
@@ -3960,6 +3978,7 @@ static DEVICE_ATTR_RW(sas_ncq_prio_enable);
struct device_attribute *mpt3sas_dev_attrs[] = {
&dev_attr_sas_address,
&dev_attr_sas_device_handle,
+ &dev_attr_sas_ncq_prio_supported,
&dev_attr_sas_ncq_prio_enable,
NULL,
};
--
2.31.1
next prev parent reply other threads:[~2021-08-06 7:43 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-06 7:42 [PATCH v2 0/9] libata cleanups and improvements Damien Le Moal
2021-08-06 7:42 ` [PATCH v2 1/9] libata: fix ata_host_alloc_pinfo() Damien Le Moal
2021-08-06 8:49 ` Hannes Reinecke
2021-08-06 14:25 ` James Bottomley
2021-08-06 14:31 ` Damien Le Moal
2021-08-06 7:42 ` [PATCH v2 2/9] libata: fix ata_host_start() Damien Le Moal
2021-08-06 8:50 ` Hannes Reinecke
2021-08-06 14:31 ` James Bottomley
2021-08-06 14:33 ` Damien Le Moal
2021-08-07 3:32 ` Damien Le Moal
2021-08-06 7:42 ` [PATCH v2 3/9] libata: cleanup device sleep capability detection Damien Le Moal
2021-08-06 8:50 ` Hannes Reinecke
2021-08-06 7:42 ` [PATCH v2 4/9] libata: cleanup ata_dev_configure() Damien Le Moal
2021-08-06 9:07 ` Hannes Reinecke
2021-08-06 9:12 ` Damien Le Moal
2021-08-06 9:28 ` Hannes Reinecke
2021-08-06 9:32 ` Damien Le Moal
2021-08-06 7:42 ` [PATCH v2 5/9] libata: cleanup NCQ priority handling Damien Le Moal
2021-08-06 9:09 ` Hannes Reinecke
2021-08-06 7:42 ` [PATCH v2 6/9] libata: fix ata_read_log_page() warning Damien Le Moal
2021-08-06 9:10 ` Hannes Reinecke
2021-08-06 7:42 ` [PATCH v2 7/9] libata: print feature list on device scan Damien Le Moal
2021-08-06 9:11 ` Hannes Reinecke
2021-08-06 7:42 ` [PATCH v2 8/9] libahci: Introduce ncq_prio_supported sysfs sttribute Damien Le Moal
2021-08-06 7:42 ` Damien Le Moal [this message]
2021-08-06 9:12 ` [PATCH v2 9/9] scsi: mpt3sas: Introduce sas_ncq_prio_supported " Hannes Reinecke
2021-08-06 9:16 ` Damien Le Moal
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