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authorJason Yan <yanaijie@huawei.com>2017-12-08 12:42:06 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2018-01-09 05:59:28 +0300
commit8eea9dd84e450e5262643823691108f2a208a2ac (patch)
tree955ffe8a05c8ef84e5c5cdf491cc7bd6922808af /drivers/scsi/libsas/sas_init.c
parentf12486e06ae87453530f00a6cb49b60ae3fe4551 (diff)
downloadlinux-8eea9dd84e450e5262643823691108f2a208a2ac.tar.xz
scsi: libsas: make the event threshold configurable
Add a sysfs attr that LLDD can configure it for every host. We made an example in hisi_sas. Other LLDDs using libsas can implement it if they want. Suggested-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jason Yan <yanaijie@huawei.com> CC: John Garry <john.garry@huawei.com> CC: Johannes Thumshirn <jthumshirn@suse.de> CC: Ewan Milne <emilne@redhat.com> CC: Christoph Hellwig <hch@lst.de> CC: Tomas Henzl <thenzl@redhat.com> CC: Dan Williams <dan.j.williams@intel.com> Acked-by: John Garry <john.garry@huawei.com> #for hisi_sas part Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/libsas/sas_init.c')
-rw-r--r--drivers/scsi/libsas/sas_init.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 22bfc025ae81..afd928bf903e 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -538,6 +538,37 @@ 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);
+
+ /* threshold cannot be set too small */
+ if (sha->event_thres < 32)
+ sha->event_thres = 32;
+
+ 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)
{