[PATCH 1/7] scsi_debug: add zbc mode and VPD pages

[Damien Le Moal <damien.lemoal@wdc.com>]

From: Douglas Gilbert <dgilbert@interlog.com>

The ZBC standard "piggy-backs" on many, but not all, of the
facilities in SBC. Add those ZBC mode pages (plus mode
parameter block descriptors (e.g. "WP")) and VPD pages in
common with SBC. Add ZBC specific VPD page for the host-managed
ZBC device type (ptype=0x14).

Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
---
 drivers/scsi/scsi_debug.c | 55 +++++++++++++++++++++++++++++++--------
 1 file changed, 44 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 0eede06fc66c..4aa4d9e58978 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1445,6 +1445,24 @@ static int inquiry_vpd_b2(unsigned char *arr)
 	return 0x4;
 }
 
+/* Zoned block device characteristics VPD page (ZBC mandatory) */
+static int inquiry_vpd_b6(unsigned char *arr)
+{
+	memset(arr, 0, 0x3c);
+	arr[0] = 0x1; /* set URSWRZ (unrestricted read in seq. wr req zone) */
+	/*
+	 * Set Optimal number of open sequential write preferred zones and
+	 * Optimal number of non-sequentially written sequential write
+	 * preferred zones and Maximum number of open sequential write
+	 * required zones fields to 'not reported' (0xffffffff). Leave other
+	 * fields set to zero.
+	 */
+	put_unaligned_be32(0xffffffff, &arr[4]);
+	put_unaligned_be32(0xffffffff, &arr[8]);
+	put_unaligned_be32(0xffffffff, &arr[12]);
+	return 0x3c;
+}
+
 #define SDEBUG_LONG_INQ_SZ 96
 #define SDEBUG_MAX_INQ_ARR_SZ 584
 
@@ -1454,13 +1472,15 @@ static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 	unsigned char *arr;
 	unsigned char *cmd = scp->cmnd;
 	int alloc_len, n, ret;
-	bool have_wlun, is_disk;
+	bool have_wlun, is_disk, is_zbc, is_disk_zbc;
 
 	alloc_len = get_unaligned_be16(cmd + 3);
 	arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC);
 	if (! arr)
 		return DID_REQUEUE << 16;
 	is_disk = (sdebug_ptype == TYPE_DISK);
+	is_zbc = (sdebug_ptype == TYPE_ZBC);
+	is_disk_zbc = (is_disk || is_zbc);
 	have_wlun = scsi_is_wlun(scp->device->lun);
 	if (have_wlun)
 		pq_pdt = TYPE_WLUN;	/* present, wlun */
@@ -1498,11 +1518,14 @@ static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 			arr[n++] = 0x86;  /* extended inquiry */
 			arr[n++] = 0x87;  /* mode page policy */
 			arr[n++] = 0x88;  /* SCSI ports */
-			if (is_disk) {	  /* SBC only */
+			if (is_disk_zbc) {	  /* SBC or ZBC */
 				arr[n++] = 0x89;  /* ATA information */
 				arr[n++] = 0xb0;  /* Block limits */
 				arr[n++] = 0xb1;  /* Block characteristics */
-				arr[n++] = 0xb2;  /* Logical Block Prov */
+				if (is_disk)
+					arr[n++] = 0xb2;  /* LB Provisioning */
+				else if (is_zbc)
+					arr[n++] = 0xb6;  /* ZB dev. char. */
 			}
 			arr[3] = n - 4;	  /* number of supported VPD pages */
 		} else if (0x80 == cmd[2]) { /* unit serial number */
@@ -1541,19 +1564,22 @@ static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 		} else if (0x88 == cmd[2]) { /* SCSI Ports */
 			arr[1] = cmd[2];	/*sanity */
 			arr[3] = inquiry_vpd_88(&arr[4], target_dev_id);
-		} else if (is_disk && 0x89 == cmd[2]) { /* ATA information */
+		} else if (is_disk_zbc && 0x89 == cmd[2]) { /* ATA info */
 			arr[1] = cmd[2];        /*sanity */
 			n = inquiry_vpd_89(&arr[4]);
 			put_unaligned_be16(n, arr + 2);
-		} else if (is_disk && 0xb0 == cmd[2]) { /* Block limits */
+		} else if (is_disk_zbc && 0xb0 == cmd[2]) { /* Block limits */
 			arr[1] = cmd[2];        /*sanity */
 			arr[3] = inquiry_vpd_b0(&arr[4]);
-		} else if (is_disk && 0xb1 == cmd[2]) { /* Block char. */
+		} else if (is_disk_zbc && 0xb1 == cmd[2]) { /* Block char. */
 			arr[1] = cmd[2];        /*sanity */
 			arr[3] = inquiry_vpd_b1(&arr[4]);
 		} else if (is_disk && 0xb2 == cmd[2]) { /* LB Prov. */
 			arr[1] = cmd[2];        /*sanity */
 			arr[3] = inquiry_vpd_b2(&arr[4]);
+		} else if (is_zbc && cmd[2] == 0xb6) { /* ZB dev. charact. */
+			arr[1] = cmd[2];        /*sanity */
+			arr[3] = inquiry_vpd_b6(&arr[4]);
 		} else {
 			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, -1);
 			kfree(arr);
@@ -1591,6 +1617,9 @@ static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 	} else if (sdebug_ptype == TYPE_TAPE) {	/* SSC-4 rev 3 */
 		put_unaligned_be16(0x525, arr + n);
 		n += 2;
+	} else if (is_zbc) {	/* ZBC BSR INCITS 536 revision 05 */
+		put_unaligned_be16(0x624, arr + n);
+		n += 2;
 	}
 	put_unaligned_be16(0x2100, arr + n);	/* SPL-4 no version claimed */
 	ret = fill_from_dev_buffer(scp, arr,
@@ -2180,7 +2209,7 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 	unsigned char *ap;
 	unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
 	unsigned char *cmd = scp->cmnd;
-	bool dbd, llbaa, msense_6, is_disk, bad_pcode;
+	bool dbd, llbaa, msense_6, is_disk, is_zbc, bad_pcode;
 
 	dbd = !!(cmd[1] & 0x8);		/* disable block descriptors */
 	pcontrol = (cmd[2] & 0xc0) >> 6;
@@ -2189,7 +2218,8 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 	msense_6 = (MODE_SENSE == cmd[0]);
 	llbaa = msense_6 ? false : !!(cmd[1] & 0x10);
 	is_disk = (sdebug_ptype == TYPE_DISK);
-	if (is_disk && !dbd)
+	is_zbc = (sdebug_ptype == TYPE_ZBC);
+	if ((is_disk || is_zbc) && !dbd)
 		bd_len = llbaa ? 16 : 8;
 	else
 		bd_len = 0;
@@ -2201,8 +2231,8 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 	}
 	target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
 			(devip->target * 1000) - 3;
-	/* for disks set DPOFUA bit and clear write protect (WP) bit */
-	if (is_disk) {
+	/* for disks+zbc set DPOFUA bit and clear write protect (WP) bit */
+	if (is_disk || is_zbc) {
 		dev_spec = 0x10;	/* =0x90 if WP=1 implies read-only */
 		if (sdebug_wp)
 			dev_spec |= 0x80;
@@ -2262,7 +2292,7 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 			bad_pcode = true;
 		break;
 	case 0x8:	/* Caching page, direct access */
-		if (is_disk) {
+		if (is_disk || is_zbc) {
 			len = resp_caching_pg(ap, pcontrol, target);
 			offset += len;
 		} else
@@ -2300,6 +2330,9 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 						      target);
 				len += resp_caching_pg(ap + len, pcontrol,
 						       target);
+			} else if (is_zbc) {
+				len += resp_caching_pg(ap + len, pcontrol,
+						       target);
 			}
 			len += resp_ctrl_m_pg(ap + len, pcontrol, target);
 			len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
-- 
2.25.3