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[SCSI] scsi_debug: Block Limits VPD page fixes 

Add a few clarifying comments in the B0 page function and allow the
optimal transfer length field to be specified on the command line using
opt_blks=N.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Martin K. Petersen 2010-03-23 01:12:27 -04:00 committed by James Bottomley
parent 9dc9fd9484
commit e308b3d19d
1 changed files with 16 additions and 0 deletions
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16
drivers/scsi/scsi_debug.c
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@ -108,6 +108,7 @@ static const char * scsi_debug_version_date = "20100324";
#define DEF_ATO 1
#define DEF_PHYSBLK_EXP 0
#define DEF_LOWEST_ALIGNED 0
#define DEF_OPT_BLKS 64
#define DEF_UNMAP_MAX_BLOCKS 0
#define DEF_UNMAP_MAX_DESC 0
#define DEF_UNMAP_GRANULARITY 0
@ -175,6 +176,7 @@ 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_opt_blks = DEF_OPT_BLKS;
static int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC;
static int scsi_debug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS;
static int scsi_debug_unmap_granularity = DEF_UNMAP_GRANULARITY;
@ -704,9 +706,13 @@ static int inquiry_evpd_b0(unsigned char * arr)
unsigned int gran;
memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
/* Optimal transfer length granularity */
gran = 1 << scsi_debug_physblk_exp;
arr[2] = (gran >> 8) & 0xff;
arr[3] = gran & 0xff;
/* Maximum Transfer Length */
if (sdebug_store_sectors > 0x400) {
arr[4] = (sdebug_store_sectors >> 24) & 0xff;
arr[5] = (sdebug_store_sectors >> 16) & 0xff;
@ -714,6 +720,9 @@ static int inquiry_evpd_b0(unsigned char * arr)
arr[7] = sdebug_store_sectors & 0xff;
}
/* Optimal Transfer Length */
put_unaligned_be32(scsi_debug_opt_blks, &arr[8]);
if (scsi_debug_unmap_max_desc) {
unsigned int blocks;
@ -722,15 +731,20 @@ static int inquiry_evpd_b0(unsigned char * arr)
else
blocks = 0xffffffff;
/* Maximum Unmap LBA Count */
put_unaligned_be32(blocks, &arr[16]);
/* Maximum Unmap Block Descriptor Count */
put_unaligned_be32(scsi_debug_unmap_max_desc, &arr[20]);
}
/* Unmap Granularity Alignment */
if (scsi_debug_unmap_alignment) {
put_unaligned_be32(scsi_debug_unmap_alignment, &arr[28]);
arr[28] |= 0x80; /* UGAVALID */
}
/* Optimal Unmap Granularity */
if (scsi_debug_unmap_granularity) {
put_unaligned_be32(scsi_debug_unmap_granularity, &arr[24]);
return 0x3c; /* Mandatory page length for thin provisioning */
@ -2685,6 +2699,7 @@ 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(opt_blks, scsi_debug_opt_blks, int, S_IRUGO);
module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO);
module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO);
module_param_named(unmap_max_desc, scsi_debug_unmap_max_desc, int, S_IRUGO);
@ -2715,6 +2730,7 @@ 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, "logical block size in bytes (def=512)");
MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)");
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)");