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authorMartin K. Petersen <martin.petersen@oracle.com>2009-05-23 11:43:37 -0400
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2009-06-21 10:52:37 -0500
commitea09bcc9c298d3057270abd78a973fc678d55c4c (patch)
tree35764eeb8325f03c29b2da115290c06c9f8303ab /drivers/scsi
parentc277331d5fbaae5772ed19862feefa91f4e477d3 (diff)
sd: Physical block size and alignment support
Extract physical block size and lowest aligned LBA from READ CAPACITY(16) response and adjust queue parameters. Report physical block size and alignment when applicable. [jejb: fix up trailing whitespace] Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/sd.c23
-rw-r--r--drivers/scsi/sd.h1
2 files changed, 22 insertions, 2 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 878b17a9af30..a86064b6458d 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1307,6 +1307,7 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
int sense_valid = 0;
int the_result;
int retries = 3;
+ unsigned int alignment;
unsigned long long lba;
unsigned sector_size;
@@ -1358,6 +1359,16 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
return -EOVERFLOW;
}
+ /* Logical blocks per physical block exponent */
+ sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
+
+ /* Lowest aligned logical block */
+ alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
+ blk_queue_alignment_offset(sdp->request_queue, alignment);
+ if (alignment && sdkp->first_scan)
+ sd_printk(KERN_NOTICE, sdkp,
+ "physical block alignment offset: %u\n", alignment);
+
sdkp->capacity = lba + 1;
return sector_size;
}
@@ -1409,6 +1420,7 @@ static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
}
sdkp->capacity = lba + 1;
+ sdkp->hw_sector_size = sector_size;
return sector_size;
}
@@ -1521,11 +1533,17 @@ got_data:
string_get_size(sz, STRING_UNITS_10, cap_str_10,
sizeof(cap_str_10));
- if (sdkp->first_scan || old_capacity != sdkp->capacity)
+ if (sdkp->first_scan || old_capacity != sdkp->capacity) {
sd_printk(KERN_NOTICE, sdkp,
- "%llu %d-byte hardware sectors: (%s/%s)\n",
+ "%llu %d-byte logical blocks: (%s/%s)\n",
(unsigned long long)sdkp->capacity,
sector_size, cap_str_10, cap_str_2);
+
+ if (sdkp->hw_sector_size != sector_size)
+ sd_printk(KERN_NOTICE, sdkp,
+ "%u-byte physical blocks\n",
+ sdkp->hw_sector_size);
+ }
}
/* Rescale capacity to 512-byte units */
@@ -1538,6 +1556,7 @@ got_data:
else if (sector_size == 256)
sdkp->capacity >>= 1;
+ blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
sdkp->device->sector_size = sector_size;
}
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 708778cf5f06..8474b5bad3fe 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -45,6 +45,7 @@ struct scsi_disk {
unsigned int openers; /* protected by BKL for now, yuck */
sector_t capacity; /* size in 512-byte sectors */
u32 index;
+ unsigned short hw_sector_size;
u8 media_present;
u8 write_prot;
u8 protection_type;/* Data Integrity Field */