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scsi_debug: Add support for physical block exponent and alignment

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This patch adds support for setting the physical block exponent and
lowest aligned LBA in the READ CAPACITY(16) response.

The B0 VPD page is adjusted accordingly.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Martin K. Petersen 2009-05-15 00:40:33 -04:00 committed by James Bottomley
parent 895553824e
commit ea61fca58c
1 changed files with 29 additions and 1 deletions
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30
drivers/scsi/scsi_debug.c
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@ -101,6 +101,8 @@ static const char * scsi_debug_version_date = "20070104";
#define DEF_DIF 0
#define DEF_GUARD 0
#define DEF_ATO 1
#define DEF_PHYSBLK_EXP 0
#define DEF_LOWEST_ALIGNED 0
/* bit mask values for scsi_debug_opts */
#define SCSI_DEBUG_OPT_NOISE 1
@ -156,6 +158,8 @@ static int scsi_debug_dix = DEF_DIX;
static int scsi_debug_dif = DEF_DIF;
static int scsi_debug_guard = DEF_GUARD;
static int scsi_debug_ato = DEF_ATO;
static int scsi_debug_physblk_exp = DEF_PHYSBLK_EXP;
static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
static int scsi_debug_cmnd_count = 0;
@ -657,7 +661,12 @@ static unsigned char vpdb0_data[] = {
static int inquiry_evpd_b0(unsigned char * arr)
{
unsigned int gran;
memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
gran = 1 << scsi_debug_physblk_exp;
arr[2] = (gran >> 8) & 0xff;
arr[3] = gran & 0xff;
if (sdebug_store_sectors > 0x400) {
arr[4] = (sdebug_store_sectors >> 24) & 0xff;
arr[5] = (sdebug_store_sectors >> 16) & 0xff;
@ -945,6 +954,9 @@ static int resp_readcap16(struct scsi_cmnd * scp,
arr[9] = (scsi_debug_sector_size >> 16) & 0xff;
arr[10] = (scsi_debug_sector_size >> 8) & 0xff;
arr[11] = scsi_debug_sector_size & 0xff;
arr[13] = scsi_debug_physblk_exp & 0xf;
arr[14] = (scsi_debug_lowest_aligned >> 8) & 0x3f;
arr[15] = scsi_debug_lowest_aligned & 0xff;
if (scsi_debug_dif) {
arr[12] = (scsi_debug_dif - 1) << 1; /* P_TYPE */
@ -2380,6 +2392,8 @@ module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
module_param_named(dif, scsi_debug_dif, int, S_IRUGO);
module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
module_param_named(ato, scsi_debug_ato, int, S_IRUGO);
module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO);
module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO);
MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
MODULE_DESCRIPTION("SCSI debug adapter driver");
@ -2401,7 +2415,9 @@ MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
MODULE_PARM_DESC(virtual_gb, "virtual gigabyte size (def=0 -> use dev_size_mb)");
MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");
MODULE_PARM_DESC(sector_size, "hardware sector size in bytes (def=512)");
MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)");
MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)");
MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)");
@ -2874,6 +2890,18 @@ static int __init scsi_debug_init(void)
return -EINVAL;
}
if (scsi_debug_physblk_exp > 15) {
printk(KERN_ERR "scsi_debug_init: invalid physblk_exp %u\n",
scsi_debug_physblk_exp);
return -EINVAL;
}
if (scsi_debug_lowest_aligned > 0x3fff) {
printk(KERN_ERR "scsi_debug_init: lowest_aligned too big: %u\n",
scsi_debug_lowest_aligned);
return -EINVAL;
}
if (scsi_debug_dev_size_mb < 1)
scsi_debug_dev_size_mb = 1; /* force minimum 1 MB ramdisk */
sz = (unsigned long)scsi_debug_dev_size_mb * 1048576;