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Commit 8eea9dd8 authored by Jason Yan's avatar Jason Yan Committed by Martin K. Petersen
Browse files

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: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJason 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: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent f12486e0

drivers/scsi/hisi_sas/hisi_sas_main.c

+6 −0
Original line number Diff line number Diff line
@@ -1672,6 +1672,11 @@ EXPORT_SYMBOL_GPL(hisi_sas_kill_tasklets); 
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,
@@ -1691,6 +1696,7 @@ static struct scsi_host_template _hisi_sas_sht = { 
	.eh_target_reset_handler = sas_eh_target_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);

drivers/scsi/libsas/sas_init.c

+31 −0
Original line number Diff line number Diff line
@@ -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)

{

include/scsi/libsas.h

+1 −0
Original line number Diff line number Diff line
@@ -681,6 +681,7 @@ 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 *);