Commit 631e8a13 authored by Al Viro 's avatar Al Viro Committed by James Bottomley
Browse files

[SCSI] TYPE_RBC cache fixes (sbp2.c affected)



	a) TYPE_SDAD renamed to TYPE_RBC and taken to scsi.h
	b) in sbp2.c remapping of TYPE_RPB to TYPE_DISK turned off
	c) relevant places in midlayer and sd.c taught to accept TYPE_RBC
	d) sd.c::sd_read_cache_type() looks into page 6 when dealing with
TYPE_RBC - these guys have writeback cache flag there and are not guaranteed
to have page 8 at all.
	e) sd_read_cache_type() got an extra sanity check - it checks that
it got the page it asked for before using its contents.  And screams if
mismatch had happened.  Rationale: there are broken devices out there that
are "helpful" enough to go for "I don't have a page you've asked for, here,
have another one".  For example, PL3507 had been caught doing just that...
	f) sbp2 sets sdev->use_10_for_rw and sdev->use_10_for_ms instead
of bothering to remap READ6/WRITE6/MOD_SENSE, so most of the conversions
in there are gone now.

	Incidentally, I wonder if USB storage devices that have no
mode page 8 are simply RBC ones.  I haven't touched that, but it might
be interesting to check...
Signed-off-by: default avatarAl Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 53222b90
......@@ -1070,7 +1070,7 @@ static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid, quadlet_
static __inline__ int sbp2_command_conversion_device_type(u8 device_type)
{
return (((device_type == TYPE_DISK) ||
(device_type == TYPE_SDAD) ||
(device_type == TYPE_RBC) ||
(device_type == TYPE_ROM)) ? 1:0);
}
......@@ -2111,102 +2111,6 @@ static int sbp2_send_command(struct scsi_id_instance_data *scsi_id,
*/
static void sbp2_check_sbp2_command(struct scsi_id_instance_data *scsi_id, unchar *cmd)
{
unchar new_cmd[16];
u8 device_type = SBP2_DEVICE_TYPE (scsi_id->sbp2_device_type_and_lun);
SBP2_DEBUG("sbp2_check_sbp2_command");
switch (*cmd) {
case READ_6:
if (sbp2_command_conversion_device_type(device_type)) {
SBP2_DEBUG("Convert READ_6 to READ_10");
/*
* Need to turn read_6 into read_10
*/
new_cmd[0] = 0x28;
new_cmd[1] = (cmd[1] & 0xe0);
new_cmd[2] = 0x0;
new_cmd[3] = (cmd[1] & 0x1f);
new_cmd[4] = cmd[2];
new_cmd[5] = cmd[3];
new_cmd[6] = 0x0;
new_cmd[7] = 0x0;
new_cmd[8] = cmd[4];
new_cmd[9] = cmd[5];
memcpy(cmd, new_cmd, 10);
}
break;
case WRITE_6:
if (sbp2_command_conversion_device_type(device_type)) {
SBP2_DEBUG("Convert WRITE_6 to WRITE_10");
/*
* Need to turn write_6 into write_10
*/
new_cmd[0] = 0x2a;
new_cmd[1] = (cmd[1] & 0xe0);
new_cmd[2] = 0x0;
new_cmd[3] = (cmd[1] & 0x1f);
new_cmd[4] = cmd[2];
new_cmd[5] = cmd[3];
new_cmd[6] = 0x0;
new_cmd[7] = 0x0;
new_cmd[8] = cmd[4];
new_cmd[9] = cmd[5];
memcpy(cmd, new_cmd, 10);
}
break;
case MODE_SENSE:
if (sbp2_command_conversion_device_type(device_type)) {
SBP2_DEBUG("Convert MODE_SENSE_6 to MODE_SENSE_10");
/*
* Need to turn mode_sense_6 into mode_sense_10
*/
new_cmd[0] = 0x5a;
new_cmd[1] = cmd[1];
new_cmd[2] = cmd[2];
new_cmd[3] = 0x0;
new_cmd[4] = 0x0;
new_cmd[5] = 0x0;
new_cmd[6] = 0x0;
new_cmd[7] = 0x0;
new_cmd[8] = cmd[4];
new_cmd[9] = cmd[5];
memcpy(cmd, new_cmd, 10);
}
break;
case MODE_SELECT:
/*
* TODO. Probably need to change mode select to 10 byte version
*/
default:
break;
}
return;
}
/*
......@@ -2271,14 +2175,6 @@ static void sbp2_check_sbp2_response(struct scsi_id_instance_data *scsi_id,
scsi_buf[4] = 36 - 5;
}
/*
* Check for Simple Direct Access Device and change it to TYPE_DISK
*/
if ((scsi_buf[0] & 0x1f) == TYPE_SDAD) {
SBP2_DEBUG("Changing TYPE_SDAD to TYPE_DISK");
scsi_buf[0] &= 0xe0;
}
/*
* Fix ansi revision and response data format
*/
......@@ -2287,27 +2183,6 @@ static void sbp2_check_sbp2_response(struct scsi_id_instance_data *scsi_id,
break;
case MODE_SENSE:
if (sbp2_command_conversion_device_type(device_type)) {
SBP2_DEBUG("Modify mode sense response (10 byte version)");
scsi_buf[0] = scsi_buf[1]; /* Mode data length */
scsi_buf[1] = scsi_buf[2]; /* Medium type */
scsi_buf[2] = scsi_buf[3]; /* Device specific parameter */
scsi_buf[3] = scsi_buf[7]; /* Block descriptor length */
memcpy(scsi_buf + 4, scsi_buf + 8, scsi_buf[0]);
}
break;
case MODE_SELECT:
/*
* TODO. Probably need to change mode select to 10 byte version
*/
default:
break;
}
......@@ -2690,7 +2565,8 @@ static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id,
static int sbp2scsi_slave_configure (struct scsi_device *sdev)
{
blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
sdev->use_10_for_rw = 1;
sdev->use_10_for_ms = 1;
return 0;
}
......
......@@ -266,10 +266,6 @@ struct sbp2_status_block {
#define SBP2_MAX_UDS_PER_NODE 16 /* Maximum scsi devices per node */
#define SBP2_MAX_SECTORS 255 /* Max sectors supported */
#ifndef TYPE_SDAD
#define TYPE_SDAD 0x0e /* simplified direct access device */
#endif
/*
* SCSI direction table...
* (now used as a back-up in case the direction passed down from above is "unknown")
......
......@@ -625,6 +625,7 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
case TYPE_MEDIUM_CHANGER:
case TYPE_ENCLOSURE:
case TYPE_COMM:
case TYPE_RBC:
sdev->writeable = 1;
break;
case TYPE_WORM:
......
......@@ -1368,17 +1368,26 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
*/
static void
sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
struct scsi_request *SRpnt, unsigned char *buffer) {
struct scsi_request *SRpnt, unsigned char *buffer)
{
int len = 0, res;
const int dbd = 0; /* DBD */
const int modepage = 0x08; /* current values, cache page */
int dbd;
int modepage;
struct scsi_mode_data data;
struct scsi_sense_hdr sshdr;
if (sdkp->device->skip_ms_page_8)
goto defaults;
if (sdkp->device->type == TYPE_RBC) {
modepage = 6;
dbd = 8;
} else {
modepage = 8;
dbd = 0;
}
/* cautiously ask */
res = sd_do_mode_sense(SRpnt, dbd, modepage, buffer, 4, &data);
......@@ -1409,11 +1418,20 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
"write back, no read (daft)"
};
int ct = 0;
int offset = data.header_length +
data.block_descriptor_length + 2;
int offset = data.header_length + data.block_descriptor_length;
sdkp->WCE = ((buffer[offset] & 0x04) != 0);
sdkp->RCD = ((buffer[offset] & 0x01) != 0);
if ((buffer[offset] & 0x3f) != modepage) {
printk(KERN_ERR "%s: got wrong page\n", diskname);
goto defaults;
}
if (modepage == 8) {
sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
} else {
sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
sdkp->RCD = 0;
}
ct = sdkp->RCD + 2*sdkp->WCE;
......@@ -1533,7 +1551,7 @@ static int sd_probe(struct device *dev)
int error;
error = -ENODEV;
if ((sdp->type != TYPE_DISK) && (sdp->type != TYPE_MOD))
if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
goto out;
SCSI_LOG_HLQUEUE(3, printk("sd_attach: scsi device: <%d,%d,%d,%d>\n",
......@@ -1570,7 +1588,7 @@ static int sd_probe(struct device *dev)
sdkp->openers = 0;
if (!sdp->timeout) {
if (sdp->type == TYPE_DISK)
if (sdp->type != TYPE_MOD)
sdp->timeout = SD_TIMEOUT;
else
sdp->timeout = SD_MOD_TIMEOUT;
......
......@@ -213,6 +213,7 @@ static inline int scsi_status_is_good(int status)
#define TYPE_COMM 0x09 /* Communications device */
#define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
#define TYPE_RAID 0x0c
#define TYPE_RBC 0x0e
#define TYPE_NO_LUN 0x7f
/*
......
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