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Commit ba1fc175 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by James Bottomley
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[SCSI] libsas: add SAS management protocol handler



This patch adds support for SAS Management Protocol (SMP) passthrough
support via bsg. aic94xx can use this.

Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 7aa68e80
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+48 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@
 */

#include <linux/scatterlist.h>
#include <linux/blkdev.h>

#include "sas_internal.h"

@@ -1972,3 +1973,50 @@ static ssize_t smp_portal_read(struct kobject *kobj,
	return res;
}
#endif

int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
		    struct request *req)
{
	struct domain_device *dev;
	int ret, type = rphy->identify.device_type;
	struct request *rsp = req->next_rq;

	if (!rsp) {
		printk("%s: space for a smp response is missing\n",
		       __FUNCTION__);
		return -EINVAL;
	}

	/* seems aic94xx doesn't support */
	if (!rphy) {
		printk("%s: can we send a smp request to a host?\n",
		       __FUNCTION__);
		return -EINVAL;
	}

	if (type != SAS_EDGE_EXPANDER_DEVICE &&
	    type != SAS_FANOUT_EXPANDER_DEVICE) {
		printk("%s: can we send a smp request to a device?\n",
		       __FUNCTION__);
		return -EINVAL;
	}

	dev = sas_find_dev_by_rphy(rphy);
	if (!dev) {
		printk("%s: fail to find a domain_device?\n", __FUNCTION__);
		return -EINVAL;
	}

	/* do we need to support multiple segments? */
	if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
		printk("%s: multiple segments req %u %u, rsp %u %u\n",
		       __FUNCTION__, req->bio->bi_vcnt, req->data_len,
		       rsp->bio->bi_vcnt, rsp->data_len);
		return -EINVAL;
	}

	ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
			       bio_data(rsp->bio), rsp->data_len);

	return ret;
}
+1 −0
Original line number Diff line number Diff line
@@ -259,6 +259,7 @@ static struct sas_function_template sft = {
	.phy_reset = sas_phy_reset,
	.set_phy_speed = sas_set_phy_speed,
	.get_linkerrors = sas_get_linkerrors,
	.smp_handler = sas_smp_handler,
};

struct scsi_transport_template *
+2 −0
Original line number Diff line number Diff line
@@ -674,4 +674,6 @@ extern void sas_target_destroy(struct scsi_target *);
extern int sas_slave_alloc(struct scsi_device *);
extern int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg);

extern int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
			   struct request *req);
#endif /* _SASLIB_H_ */