Commit a93aa1fe authored by Matt Gates's avatar Matt Gates Committed by James Bottomley
Browse files

[SCSI] hpsa: use extended report luns command for HP SSD SmartPath 



There is an extended report luns command which contains
additional information about physical devices.  In particular
we need to get the physical device handle so we can use an
alternate i/o path for fast physical devices like SSDs so
we can speed up certain i/o's by bypassing the RAID stack
code in the controller firmware.

Signed-off-by: default avatarMatt Gates <matthew.gates@hp.com>
Signed-off-by: default avatarStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 2b01d816

drivers/scsi/hpsa.c

+8 −5
Original line number Diff line number Diff line
@@ -1888,11 +1888,12 @@ static int hpsa_gather_lun_info(struct ctlr_info *h, 
	struct ReportLUNdata *physdev, u32 *nphysicals,

	struct ReportLUNdata *logdev, u32 *nlogicals)

{

	if (hpsa_scsi_do_report_phys_luns(h, physdev, reportlunsize, 0)) {

	if (hpsa_scsi_do_report_phys_luns(h, physdev, reportlunsize,

					HPSA_REPORT_PHYS_EXTENDED)) {

		dev_err(&h->pdev->dev, "report physical LUNs failed.\n");

		return -1;

	}

	*nphysicals = be32_to_cpu(*((__be32 *)physdev->LUNListLength)) / 8;

	*nphysicals = be32_to_cpu(*((__be32 *)physdev->LUNListLength)) / 24;

	if (*nphysicals > HPSA_MAX_PHYS_LUN) {

		dev_warn(&h->pdev->dev, "maximum physical LUNs (%d) exceeded."

			"  %d LUNs ignored.\n", HPSA_MAX_PHYS_LUN,
@@ -1923,7 +1924,8 @@ static int hpsa_gather_lun_info(struct ctlr_info *h, 
}



u8 *figure_lunaddrbytes(struct ctlr_info *h, int raid_ctlr_position, int i,

	int nphysicals, int nlogicals, struct ReportLUNdata *physdev_list,

	int nphysicals, int nlogicals,

	struct ReportExtendedLUNdata *physdev_list,

	struct ReportLUNdata *logdev_list)

{

	/* Helper function, figure out where the LUN ID info is coming from
@@ -1959,7 +1961,7 @@ static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno) 
	 * tell which devices we already know about, vs. new

	 * devices, vs.  disappearing devices.

	 */

	struct ReportLUNdata *physdev_list = NULL;

	struct ReportExtendedLUNdata *physdev_list = NULL;

	struct ReportLUNdata *logdev_list = NULL;

	u32 nphysicals = 0;

	u32 nlogicals = 0;
@@ -1982,7 +1984,8 @@ static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno) 
	}

	memset(lunzerobits, 0, sizeof(lunzerobits));



	if (hpsa_gather_lun_info(h, reportlunsize, physdev_list, &nphysicals,

	if (hpsa_gather_lun_info(h, reportlunsize,

			(struct ReportLUNdata *) physdev_list, &nphysicals,

			logdev_list, &nlogicals))

		goto out;

drivers/scsi/hpsa_cmd.h

+1 −0
Original line number Diff line number Diff line
@@ -162,6 +162,7 @@ struct InquiryData { 


#define HPSA_REPORT_LOG 0xc2    /* Report Logical LUNs */

#define HPSA_REPORT_PHYS 0xc3   /* Report Physical LUNs */

#define HPSA_REPORT_PHYS_EXTENDED 0x02

struct ReportLUNdata {

	u8 LUNListLength[4];

	u32 reserved;

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