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Bottomley" , "Martin K. Petersen" , Jack Wang , Xiang Chen , Artur Paszkiewicz , Bart Van Assche , TJ Adams , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for SATA devices Message-ID: References: <20240306012226.3398927-1-ipylypiv@google.com> <20240306012226.3398927-3-ipylypiv@google.com> Precedence: bulk X-Mailing-List: linux-ide@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Mar 07, 2024 at 10:51:37AM +0100, Niklas Cassel wrote: > On Wed, Mar 06, 2024 at 11:28:42AM -0800, Igor Pylypiv wrote: > > On Wed, Mar 06, 2024 at 11:54:52AM +0100, Niklas Cassel wrote: > > > On Tue, Mar 05, 2024 at 05:22:21PM -0800, Igor Pylypiv wrote: > > > > 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. > > > > > > > > Reviewed-by: John Garry > > > > Reviewed-by: Damien Le Moal > > > > Reviewed-by: Jason Yan > > > > Signed-off-by: Igor Pylypiv > > > > --- > > > > drivers/scsi/libsas/sas_ata.c | 94 +++++++++++++++++++++++++++++++++++ > > > > include/scsi/sas_ata.h | 6 +++ > > > > 2 files changed, 100 insertions(+) > > > > > > > > diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c > > > > index 12e2653846e3..04b0bd9a4e01 100644 > > > > --- a/drivers/scsi/libsas/sas_ata.c > > > > +++ b/drivers/scsi/libsas/sas_ata.c > > > > @@ -964,3 +964,97 @@ 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); > > > > + bool supported; > > > > + int rc; > > > > + > > > > + /* This attribute shall be visible for SATA devices only */ > > > > + if (WARN_ON_ONCE(!dev_is_sata(ddev))) > > > > + return -EINVAL; > > > > > > Like Hannes commented, I don't believe this is needed. > > > > > > > The intention for the check is to serve as a fail-safe in case 'is_visible()' > > callback gets incorrectly modified and stops hiding the sysfs attributes > > for non-SATA devices. > > > > Just want to clarify should I remove the WARN_ON_ONCE and keep the fail-safe > > check or should I get rid of the check completely and trust 'is_visible()' > > to always hide the sysfs attributes for non-SATA devices? > > I think that you can remove both the WARN_ON_ONCE and the > if (!dev_is_sata()). > > We usually don't keep code around "just in case someone modifies some > other function sometime in the future". > > > If someone changes is_visible() to remove the dev_is_sata() check, > then they would introuce a bug. I don't see why anyone would change that, > but if someone tried to remove that check from is_visible() anyway, > I'm assuming that someone would catch it during code review. > Ack, makes sense. I'll remove the checks in v8. Thanks! > > > > > > > > > > + > > > > + rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported); > > > > + if (rc) > > > > + return rc; > > > > + > > > > + return sysfs_emit(buf, "%d\n", supported); > > > > +} > > > > + > > > > > > While this is a bit different depending on file, the most common way is to > > > have no blank link before the DEVICE_ATTR(). > > > > > > > In "[PATCH 1/3] ata: libata-sata: Factor out NCQ Priority configuration helpers" > > Damien asked to keep the blank link before the DEVICE_ATTR() in libata-sata.c. > > > > Non-prio sysfs attributes in libata-sata.c don't have blank lines > > before DEVICE_ATTR() so I'm more inclined to remove the lines. > > > > I'm fine with either of ways, just want to get a consensus and make it > > consistent for both libata-sata.c and sas_ata.c. > > While it is a bit different depending on file, it is slightly more common > to no have a extra blank line before DEVICE_ATTR(): > > $ git grep -B 1 DEVICE_ATTR | grep "}" | wc -l > 2167 > > $ git grep -B 1 DEVICE_ATTR | grep -- "c-$" | wc -l > 1725 > > But I'm fine to keep it like it is, especially if Damien already had expresed > a preference. > Thank you Niklas. Let's keep the extra blank line as Damien suggested. Thanks, Igor > > Kind regards, > Niklas > > > > > > > > > > +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); > > > > + bool enabled; > > > > + int rc; > > > > + > > > > + /* This attribute shall be visible for SATA devices only */ > > > > + if (WARN_ON_ONCE(!dev_is_sata(ddev))) > > > > + return -EINVAL; > > > > + > > > > + rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled); > > > > + if (rc) > > > > + return rc; > > > > + > > > > + return sysfs_emit(buf, "%d\n", enabled); > > > > +} > > > > + > > > > +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_ONCE(!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..92e27e7bf088 100644 > > > > --- a/include/scsi/sas_ata.h > > > > +++ b/include/scsi/sas_ata.h > > > > @@ -39,6 +39,9 @@ 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 +126,9 @@ static inline int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *p > > > > sas_ata_disabled_notice(); > > > > return -ENODEV; > > > > } > > > > + > > > > +#define sas_ata_sdev_attr_group ((struct attribute_group) {}) > > > > + > > > > #endif > > > > > > > > #endif /* _SAS_ATA_H_ */ > > > > -- > > > > 2.44.0.278.ge034bb2e1d-goog > > > >