Re: [PATCH v4 07/11] libsas: make the event threshold configurable

[Jack Wang]

2017-09-06 11:15 GMT+02:00 Jason Yan <yanaijie@xxxxxxxxxx>:
> Add a sysfs attr that LLDD can configure it for every host. We made
> a example in hisi_sas. Other LLDDs using libsas can implement it if
> they want.
>
> Suggested-by: Hannes Reinecke <hare@xxxxxxxx>
> Signed-off-by: Jason Yan <yanaijie@xxxxxxxxxx>
> CC: John Garry <john.garry@xxxxxxxxxx>
> CC: Johannes Thumshirn <jthumshirn@xxxxxxx>
> CC: Ewan Milne <emilne@xxxxxxxxxx>
> CC: Christoph Hellwig <hch@xxxxxx>
> CC: Tomas Henzl <thenzl@xxxxxxxxxx>
> CC: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
>  drivers/scsi/hisi_sas/hisi_sas_main.c |  6 ++++++
>  drivers/scsi/libsas/sas_init.c        | 27 +++++++++++++++++++++++++++
>  include/scsi/libsas.h                 |  1 +
>  3 files changed, 34 insertions(+)
>
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
> index 5e47abb..9eceed1 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_main.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
> @@ -1470,6 +1470,11 @@ EXPORT_SYMBOL_GPL(hisi_sas_rescan_topology);
>  struct scsi_transport_template *hisi_sas_stt;
>  EXPORT_SYMBOL_GPL(hisi_sas_stt);
>
> +struct device_attribute *host_attrs[] = {
> +    &dev_attr_phy_event_threshold,
> +    NULL,
> +};
> +
>  static struct scsi_host_template _hisi_sas_sht = {
>         .module                 = THIS_MODULE,
>         .name                   = DRV_NAME,
> @@ -1489,6 +1494,7 @@ static struct scsi_host_template _hisi_sas_sht = {
>         .eh_bus_reset_handler   = sas_eh_bus_reset_handler,
>         .target_destroy         = sas_target_destroy,
>         .ioctl                  = sas_ioctl,
> +       .shost_attrs            = host_attrs,
>  };
>  struct scsi_host_template *hisi_sas_sht = &_hisi_sas_sht;
>  EXPORT_SYMBOL_GPL(hisi_sas_sht);
> diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
> index b1e03d5..e2d98a8 100644
> --- a/drivers/scsi/libsas/sas_init.c
> +++ b/drivers/scsi/libsas/sas_init.c
> @@ -537,6 +537,33 @@ static struct sas_function_template sft = {
>         .smp_handler = sas_smp_handler,
>  };
>
> +static inline ssize_t phy_event_threshold_show(struct device *dev,
> +                       struct device_attribute *attr, char *buf)
> +{
> +       struct Scsi_Host *shost = class_to_shost(dev);
> +       struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
> +
> +       return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres);
> +}
> +
> +static inline ssize_t phy_event_threshold_store(struct device *dev,
> +                       struct device_attribute *attr,
> +                       const char *buf, size_t count)
> +{
> +       struct Scsi_Host *shost = class_to_shost(dev);
> +       struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
> +
> +       sha->event_thres = simple_strtol(buf, NULL, 10);
> +
> +       return count;
> +}
> +
> +DEVICE_ATTR(phy_event_threshold,
> +             S_IRUGO|S_IWUSR,
> +             phy_event_threshold_show,
> +             phy_event_threshold_store);
> +EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold);
> +
>  struct scsi_transport_template *
>  sas_domain_attach_transport(struct sas_domain_function_template *dft)
>  {
> diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
> index 2fa0b13..08c1c32 100644
> --- a/include/scsi/libsas.h
> +++ b/include/scsi/libsas.h
> @@ -679,6 +679,7 @@ extern int sas_bios_param(struct scsi_device *,
>                           sector_t capacity, int *hsc);
>  extern struct scsi_transport_template *
>  sas_domain_attach_transport(struct sas_domain_function_template *);
> +extern struct device_attribute dev_attr_phy_event_threshold;
>
>  int  sas_discover_root_expander(struct domain_device *);
>
> --
> 2.5.0
>

Looks good, thanks!
Reviewed-by: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxxx>