linux-ide.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
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


  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210806074252.398482-10-damien.lemoal@wdc.com \
    --to=damien.lemoal@wdc.com \
    --cc=axboe@kernel.dk \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-ide@vger.kernel.org \
    --cc=linux-scsi@vger.kernel.org \
    --cc=martin.petersen@oracle.com \
    --cc=sathya.prakash@broadcom.com \
    --cc=sreekanth.reddy@broadcom.com \
    --cc=suganath-prabu.subramani@broadcom.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).