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scsi_debug: Implement WRITE BUFFER command 

Accept the WRITE BUFFER command and do nothing other than
set the appropriate "microcode has been changed" UA on the LU.

>From an earlier patch by Doug Gilbert.

Signed-off-by: Ewan D. Milne <emilne@redhat.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Ewan D. Milne 2014-12-04 11:49:28 -05:00 committed by Christoph Hellwig
parent 19c8ead725
commit acafd0b920
1 changed files with 71 additions and 3 deletions
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74
drivers/scsi/scsi_debug.c
View File

@ -93,6 +93,8 @@ static const char *scsi_debug_version_date = "20141022";
#define THRESHOLD_EXCEEDED 0x5d
#define LOW_POWER_COND_ON 0x5e
#define MISCOMPARE_VERIFY_ASC 0x1d
#define MICROCODE_CHANGED_ASCQ 0x1 /* with TARGET_CHANGED_ASC */
#define MICROCODE_CHANGED_WO_RESET_ASCQ 0x16
/* Additional Sense Code Qualifier (ASCQ) */
#define ACK_NAK_TO 0x3
@ -183,7 +185,9 @@ static const char *scsi_debug_version_date = "20141022";
#define SDEBUG_UA_MODE_CHANGED 2
#define SDEBUG_UA_CAPACITY_CHANGED 3
#define SDEBUG_UA_LUNS_CHANGED 4
#define SDEBUG_NUM_UAS 5
#define SDEBUG_UA_MICROCODE_CHANGED 5 /* simulate firmware change */
#define SDEBUG_UA_MICROCODE_CHANGED_WO_RESET 6
#define SDEBUG_NUM_UAS 7
/* for check_readiness() */
#define UAS_ONLY 1 /* check for UAs only */
@ -329,6 +333,7 @@ static int resp_write_same_10(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_write_same_16(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_xdwriteread_10(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_comp_write(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_write_buffer(struct scsi_cmnd *, struct sdebug_dev_info *);
struct opcode_info_t {
u8 num_attached; /* 0 if this is it (i.e. a leaf); use 0xff
@ -483,8 +488,9 @@ static const struct opcode_info_t opcode_info_arr[SDEB_I_LAST_ELEMENT + 1] = {
{0, 0x53, 0, F_D_IN | F_D_OUT | FF_DIRECT_IO, resp_xdwriteread_10,
NULL, {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7,
0, 0, 0, 0, 0, 0} },
{0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* WRITE_BUFFER */
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
{0, 0x3b, 0, F_D_OUT_MAYBE, resp_write_buffer, NULL,
{10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0,
0, 0, 0, 0} }, /* WRITE_BUFFER */
{1, 0x41, 0, F_D_OUT_MAYBE | FF_DIRECT_IO, resp_write_same_10,
write_same_iarr, {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff,
0xff, 0xc7, 0, 0, 0, 0, 0, 0} },
@ -836,6 +842,19 @@ static int check_readiness(struct scsi_cmnd *SCpnt, int uas_only,
if (debug)
cp = "capacity data changed";
break;
case SDEBUG_UA_MICROCODE_CHANGED:
mk_sense_buffer(SCpnt, UNIT_ATTENTION,
TARGET_CHANGED_ASC, MICROCODE_CHANGED_ASCQ);
if (debug)
cp = "microcode has been changed";
break;
case SDEBUG_UA_MICROCODE_CHANGED_WO_RESET:
mk_sense_buffer(SCpnt, UNIT_ATTENTION,
TARGET_CHANGED_ASC,
MICROCODE_CHANGED_WO_RESET_ASCQ);
if (debug)
cp = "microcode has been changed without reset";
break;
case SDEBUG_UA_LUNS_CHANGED:
/*
* SPC-3 behavior is to report a UNIT ATTENTION with
@ -3069,6 +3088,55 @@ resp_write_same_16(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
return resp_write_same(scp, lba, num, ei_lba, unmap, ndob);
}
/* Note the mode field is in the same position as the (lower) service action
* field. For the Report supported operation codes command, SPC-4 suggests
* each mode of this command should be reported separately; for future. */
static int
resp_write_buffer(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
{
u8 *cmd = scp->cmnd;
struct scsi_device *sdp = scp->device;
struct sdebug_dev_info *dp;
u8 mode;
mode = cmd[1] & 0x1f;
switch (mode) {
case 0x4: /* download microcode (MC) and activate (ACT) */
/* set UAs on this device only */
set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
set_bit(SDEBUG_UA_MICROCODE_CHANGED, devip->uas_bm);
break;
case 0x5: /* download MC, save and ACT */
set_bit(SDEBUG_UA_MICROCODE_CHANGED_WO_RESET, devip->uas_bm);
break;
case 0x6: /* download MC with offsets and ACT */
/* set UAs on most devices (LUs) in this target */
list_for_each_entry(dp,
&devip->sdbg_host->dev_info_list,
dev_list)
if (dp->target == sdp->id) {
set_bit(SDEBUG_UA_BUS_RESET, dp->uas_bm);
if (devip != dp)
set_bit(SDEBUG_UA_MICROCODE_CHANGED,
dp->uas_bm);
}
break;
case 0x7: /* download MC with offsets, save, and ACT */
/* set UA on all devices (LUs) in this target */
list_for_each_entry(dp,
&devip->sdbg_host->dev_info_list,
dev_list)
if (dp->target == sdp->id)
set_bit(SDEBUG_UA_MICROCODE_CHANGED_WO_RESET,
dp->uas_bm);
break;
default:
/* do nothing for this command for other mode values */
break;
}
return 0;
}
static int
resp_comp_write(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
{