Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760283AbcJSSif (ORCPT ); Wed, 19 Oct 2016 14:38:35 -0400 Received: from mail-yb0-f193.google.com ([209.85.213.193]:36012 "EHLO mail-yb0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760100AbcJSSic (ORCPT ); Wed, 19 Oct 2016 14:38:32 -0400 Date: Wed, 19 Oct 2016 14:38:29 -0400 From: Tejun Heo To: Adam Manzanares Cc: axboe@kernel.dk, dan.j.williams@intel.com, hare@suse.de, martin.petersen@oracle.com, mchristi@redhat.com, toshi.kani@hpe.com, ming.lei@canonical.com, sathya.prakash@broadcom.com, chaitra.basappa@broadcom.com, suganath-prabu.subramani@broadcom.com, linux-block@vger.kernel.org, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, MPT-FusionLinux.pdl@broadcom.com, linux-scsi@vger.kernel.org Subject: Re: [PATCH v6 3/3] ata: ATA Command Priority Disabled By Default Message-ID: <20161019183829.GK18532@htj.duckdns.org> References: <1476728850-2309-1-git-send-email-adam.manzanares@hgst.com> <1476728850-2309-4-git-send-email-adam.manzanares@hgst.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1476728850-2309-4-git-send-email-adam.manzanares@hgst.com> User-Agent: Mutt/1.7.0 (2016-08-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5199 Lines: 167 Hello, Removed ata_ncq_prio_on() and renamed _on to _enable. If I messed up anything, please let me know. Also, can you please send a follow-up patch to make the store function reject prio enabling if the device doesn't support it? Thanks. ------ 8< ------ >From 84f95243b5439a20c33837075b88926bfa00c4ec Mon Sep 17 00:00:00 2001 From: Adam Manzanares Date: Mon, 17 Oct 2016 11:27:30 -0700 Subject: [PATCH 2/2] ata: ATA Command Priority Disabled By Default Add a sysfs entry to turn on priority information being passed to a ATA device. By default this feature is turned off. This patch depends on ata: Enabling ATA Command Priorities tj: Renamed ncq_prio_on to ncq_prio_enable and removed trivial ata_ncq_prio_on() and open-coded the test. Signed-off-by: Adam Manzanares Signed-off-by: Tejun Heo --- drivers/ata/libahci.c | 1 + drivers/ata/libata-core.c | 3 ++- drivers/ata/libata-scsi.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++ include/linux/libata.h | 2 ++ 4 files changed, 73 insertions(+), 1 deletion(-) diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 0d028ea..ee7db31 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -140,6 +140,7 @@ EXPORT_SYMBOL_GPL(ahci_shost_attrs); struct device_attribute *ahci_sdev_attrs[] = { &dev_attr_sw_activity, &dev_attr_unload_heads, + &dev_attr_ncq_prio_enable, NULL }; EXPORT_SYMBOL_GPL(ahci_sdev_attrs); diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 8346faf..b294339 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -787,7 +787,8 @@ int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev, if (tf->flags & ATA_TFLAG_FUA) tf->device |= 1 << 7; - if (dev->flags & ATA_DFLAG_NCQ_PRIO) { + if ((dev->flags & ATA_DFLAG_NCQ_PRIO) && + (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE)) { if (class == IOPRIO_CLASS_RT) tf->hob_nsect |= ATA_PRIO_HIGH << ATA_SHIFT_PRIO; diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 2bccc3c..87597a3 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -271,6 +271,73 @@ DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, ata_scsi_park_show, ata_scsi_park_store); EXPORT_SYMBOL_GPL(dev_attr_unload_heads); +static ssize_t ata_ncq_prio_enable_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev = to_scsi_device(device); + struct ata_port *ap; + struct ata_device *dev; + bool ncq_prio_enable; + int rc = 0; + + ap = ata_shost_to_port(sdev->host); + + spin_lock_irq(ap->lock); + dev = ata_scsi_find_dev(ap, sdev); + if (!dev) { + rc = -ENODEV; + goto unlock; + } + + ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE; + +unlock: + spin_unlock_irq(ap->lock); + + return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable); +} + +static ssize_t ata_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 ata_port *ap; + struct ata_device *dev; + long int input; + unsigned long flags; + int rc; + + rc = kstrtol(buf, 10, &input); + if (rc) + return rc; + if ((input < 0) || (input > 1)) + return -EINVAL; + + ap = ata_shost_to_port(sdev->host); + + spin_lock_irqsave(ap->lock, flags); + dev = ata_scsi_find_dev(ap, sdev); + if (unlikely(!dev)) { + rc = -ENODEV; + goto unlock; + } + + if (input) + dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE; + else + dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE; + +unlock: + spin_unlock_irqrestore(ap->lock, flags); + + return rc ? rc : len; +} + +DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR, + ata_ncq_prio_enable_show, ata_ncq_prio_enable_store); +EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable); + void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) { @@ -402,6 +469,7 @@ EXPORT_SYMBOL_GPL(dev_attr_sw_activity); struct device_attribute *ata_common_sdev_attrs[] = { &dev_attr_unload_heads, + &dev_attr_ncq_prio_enable, NULL }; EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); diff --git a/include/linux/libata.h b/include/linux/libata.h index 90b69a6..c170be5 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -167,6 +167,7 @@ enum { ATA_DFLAG_UNLOCK_HPA = (1 << 18), /* unlock HPA */ ATA_DFLAG_NCQ_SEND_RECV = (1 << 19), /* device supports NCQ SEND and RECV */ ATA_DFLAG_NCQ_PRIO = (1 << 20), /* device supports NCQ priority */ + ATA_DFLAG_NCQ_PRIO_ENABLE = (1 << 21), /* Priority cmds sent to dev */ ATA_DFLAG_INIT_MASK = (1 << 24) - 1, ATA_DFLAG_DETACH = (1 << 24), @@ -545,6 +546,7 @@ typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes) extern struct device_attribute dev_attr_link_power_management_policy; extern struct device_attribute dev_attr_unload_heads; +extern struct device_attribute dev_attr_ncq_prio_enable; extern struct device_attribute dev_attr_em_message_type; extern struct device_attribute dev_attr_em_message; extern struct device_attribute dev_attr_sw_activity; -- 2.7.4