Hi,
I am facing an issue with write and erase of SATA DVD ROM.
HW DETAILS:
-----------
linux-sles: # cat /proc/scsi/scsi
Attached devices:
Host: scsi9 Channel: 00 Id: 01 Lun: 00
Vendor: TSSTcorp Model: CDDVDW SH-S203D Rev: SB00
Type: CD-ROM ANSI SCSI revision: 05
Linux-sles: ~ # cdrecord --scanbus
scsibus9:
9, 0, 0 900) 'TSSTcorp' 'CDDVDW SH-S203D ' 'SB00' Removable CD-ROM
ANALYSIS for erase Issue:
-------------------------
Linux-sles11:~ # cdrecord --dev=x,x,x -blank all
Timeout happened after issuing the above operation to target and LLD is initiating Abort-TMF.
Here is my analysis and solution for the same.
If we issue "blank command" to CDROM, the processing of that request will take some time to complete, mean while my timer has expired and issuing abort-task TMF. So to avoid this situation set IMMED bit 1 in "blank command" then send to it target.
Reference from mmc4:
6.2.2.2 IMMED
If IMMED is zero, then the requested operation is processed to completion prior to returning status. If
IMMED is one, then status is returned once the operation has begun.
FIX:
....
mv_sas.c:
static int mvs_task_prep_ata(struct asc_info *asi,
struct asc_task_exec_info *tei)
{ ...
if (dev->sata_dev.command_set == ATAPI_COMMAND_SET) {
...
if (task->ata_task.atapi_packet[0] == 0xa1) {/*a1 blank command */
task->ata_task.atapi_packet[1] = 0x10;
}
...}
}
ANALYSIS for write issue:
-------------------------
linux-sles11:~ # cdrecord --dev=x,x,x -dao *.iso
After issuing above operation to target, receiving "reserved error" from target for one of the write command.
Dmesg:
------
mv_task_prep_ata:719:task[f52da6c0] cdb0[2a]:cdb1[0]:cdb2[0]
mv_slot_complete:2007:task[f52da6c0] rx_desc[30000]
mvsas:asc_slot_err:1845:err_dw0[80400002]
mv_sas.c 1883:find reserved error, why?
sas: command 0xf5e40bc0, task 0xf5934d00, timed out: BLK_EH_NOT_HANDLED
Here is the error location:
mv_sas.c:
static int asc_slot_err(struct asc_info *asi, struct sas_task *task,
u32 slot_idx)
{ ...
if (err_dw0 == 0x80400002) {
mv_printk("find reserved error, why?\n");
}...
}
I don't know why we are receiving "reserved error" and how to respond to this error?
Any inputs are highly appreciated.
Thanks
Srinivas.
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