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[PATCH] sbp2: consolidate workarounds
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Grand unification of the three types of workarounds we have so far.

The "skip mode page 8" workaround is now limited to devices which
pretend to be of TYPE_DISK instead of TYPE_RBC. This workaround is no
longer enabled for Initio bridges.

Patch update in anticipation of more workarounds:
 - Add module parameter "workarounds".
 - Deprecate parameter "force_inquiry_hack".
 - Compose the blacklist of a compound type for better readability and
   extensibility.
 - Remove a now unused #define.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Stefan Richter authored and Linus Torvalds committed May 18, 2006
1 parent cb46c37 commit 24d3bf8
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9 changes: 9 additions & 0 deletions Documentation/feature-removal-schedule.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,15 @@ Who: Jody McIntyre <scjody@steamballoon.com>

---------------------------

What: sbp2: module parameter "force_inquiry_hack"
When: July 2006
Why: Superceded by parameter "workarounds". Both parameters are meant to be
used ad-hoc and for single devices only, i.e. not in modprobe.conf,
therefore the impact of this feature replacement should be low.
Who: Stefan Richter <stefanr@s5r6.in-berlin.de>

---------------------------

What: Video4Linux API 1 ioctls and video_decoder.h from Video devices.
When: July 2006
Why: V4L1 AP1 was replaced by V4L2 API. during migration from 2.4 to 2.6
Expand Down
152 changes: 91 additions & 61 deletions drivers/ieee1394/sbp2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/string.h>
#include <linux/stringify.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
Expand Down Expand Up @@ -117,7 +118,8 @@ MODULE_PARM_DESC(serialize_io, "Serialize I/O coming from scsi drivers (default
*/
static int max_sectors = SBP2_MAX_SECTORS;
module_param(max_sectors, int, 0444);
MODULE_PARM_DESC(max_sectors, "Change max sectors per I/O supported (default = 255)");
MODULE_PARM_DESC(max_sectors, "Change max sectors per I/O supported (default = "
__stringify(SBP2_MAX_SECTORS) ")");

/*
* Exclusive login to sbp2 device? In most cases, the sbp2 driver should
Expand All @@ -135,18 +137,33 @@ module_param(exclusive_login, int, 0644);
MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device (default = 1)");

/*
* SCSI inquiry hack for really badly behaved sbp2 devices. Turn this on
* if your sbp2 device is not properly handling the SCSI inquiry command.
* This hack makes the inquiry look more like a typical MS Windows inquiry
* by enforcing 36 byte inquiry and avoiding access to mode_sense page 8.
* If any of the following workarounds is required for your device to work,
* please submit the kernel messages logged by sbp2 to the linux1394-devel
* mailing list.
*
* If force_inquiry_hack=1 is required for your device to work,
* please submit the logged sbp2_firmware_revision value of this device to
* the linux1394-devel mailing list.
* - 128kB max transfer
* Limit transfer size. Necessary for some old bridges.
*
* - 36 byte inquiry
* When scsi_mod probes the device, let the inquiry command look like that
* from MS Windows.
*
* - skip mode page 8
* Suppress sending of mode_sense for mode page 8 if the device pretends to
* support the SCSI Primary Block commands instead of Reduced Block Commands.
*/
static int sbp2_default_workarounds;
module_param_named(workarounds, sbp2_default_workarounds, int, 0644);
MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36)
", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
", or a combination)");

/* legacy parameter */
static int force_inquiry_hack;
module_param(force_inquiry_hack, int, 0644);
MODULE_PARM_DESC(force_inquiry_hack, "Force SCSI inquiry hack (default = 0)");
MODULE_PARM_DESC(force_inquiry_hack, "Deprecated, use 'workarounds'");

/*
* Export information about protocols/devices supported by this driver.
Expand Down Expand Up @@ -266,14 +283,29 @@ static struct hpsb_protocol_driver sbp2_driver = {
};

/*
* List of device firmwares that require the inquiry hack.
* Yields a few false positives but did not break other devices so far.
* List of devices with known bugs.
*
* The firmware_revision field, masked with 0xffff00, is the best indicator
* for the type of bridge chip of a device. It yields a few false positives
* but this did not break correctly behaving devices so far.
*/
static u32 sbp2_broken_inquiry_list[] = {
0x00002800, /* Stefan Richter <stefanr@s5r6.in-berlin.de> */
/* DViCO Momobay CX-1 */
0x00000200 /* Andreas Plesch <plesch@fas.harvard.edu> */
/* QPS Fire DVDBurner */
static const struct {
u32 firmware_revision;
unsigned workarounds;
} sbp2_workarounds_table[] = {
/* TSB42AA9 */ {
.firmware_revision = 0x002800,
.workarounds = SBP2_WORKAROUND_INQUIRY_36 |
SBP2_WORKAROUND_MODE_SENSE_8,
},
/* Initio bridges, actually only needed for some older ones */ {
.firmware_revision = 0x000200,
.workarounds = SBP2_WORKAROUND_INQUIRY_36,
},
/* Symbios bridge */ {
.firmware_revision = 0xa0b800,
.workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
}
};

/**************************************
Expand Down Expand Up @@ -1450,7 +1482,8 @@ static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id,
struct csr1212_dentry *dentry;
u64 management_agent_addr;
u32 command_set_spec_id, command_set, unit_characteristics,
firmware_revision, workarounds;
firmware_revision;
unsigned workarounds;
int i;

SBP2_DEBUG_ENTER();
Expand Down Expand Up @@ -1506,55 +1539,46 @@ static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id,
case SBP2_FIRMWARE_REVISION_KEY:
/* Firmware revision */
firmware_revision = kv->value.immediate;
if (force_inquiry_hack)
SBP2_INFO("sbp2_firmware_revision = %x",
(unsigned int)firmware_revision);
else
SBP2_DEBUG("sbp2_firmware_revision = %x",
(unsigned int)firmware_revision);
SBP2_DEBUG("sbp2_firmware_revision = %x",
(unsigned int)firmware_revision);
break;

default:
break;
}
}

/* This is the start of our broken device checking. We try to hack
* around oddities and known defects. */
workarounds = 0x0;
workarounds = sbp2_default_workarounds;
if (force_inquiry_hack) {
SBP2_WARN("force_inquiry_hack is deprecated. "
"Use parameter 'workarounds' instead.");
workarounds |= SBP2_WORKAROUND_INQUIRY_36;
}

/* If the vendor id is 0xa0b8 (Symbios vendor id), then we have a
* bridge with 128KB max transfer size limitation. For sanity, we
* only voice this when the current max_sectors setting
* exceeds the 128k limit. By default, that is not the case.
*
* It would be really nice if we could detect this before the scsi
* host gets initialized. That way we can down-force the
* max_sectors to account for it. That is not currently
* possible. */
if ((firmware_revision & 0xffff00) ==
SBP2_128KB_BROKEN_FIRMWARE &&
(max_sectors * 512) > (128*1024)) {
SBP2_WARN("Node " NODE_BUS_FMT ": Bridge only supports 128KB max transfer size.",
NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid));
SBP2_WARN("WARNING: Current max_sectors setting is larger than 128KB (%d sectors)!",
max_sectors);
workarounds |= SBP2_BREAKAGE_128K_MAX_TRANSFER;
}

/* Check for a blacklisted set of devices that require us to force
* a 36 byte host inquiry. This can be overriden as a module param
* (to force all hosts). */
for (i = 0; i < ARRAY_SIZE(sbp2_broken_inquiry_list); i++) {
if ((firmware_revision & 0xffff00) ==
sbp2_broken_inquiry_list[i]) {
SBP2_WARN("Node " NODE_BUS_FMT ": Using 36byte inquiry workaround",
NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid));
workarounds |= SBP2_BREAKAGE_INQUIRY_HACK;
break; /* No need to continue. */
}
for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
if (sbp2_workarounds_table[i].firmware_revision !=
(firmware_revision & 0xffff00))
continue;
workarounds |= sbp2_workarounds_table[i].workarounds;
break;
}

if (workarounds)
SBP2_INFO("Workarounds for node " NODE_BUS_FMT ": "
"0x%x (firmware_revision 0x%x)",
NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid),
workarounds, firmware_revision);

/* We would need one SCSI host template for each target to adjust
* max_sectors on the fly, therefore warn only. */
if (workarounds & SBP2_WORKAROUND_128K_MAX_TRANS &&
(max_sectors * 512) > (128 * 1024))
SBP2_WARN("Node " NODE_BUS_FMT ": Bridge only supports 128KB "
"max transfer size. WARNING: Current max_sectors "
"setting is larger than 128KB (%d sectors)",
NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid),
max_sectors);

/* If this is a logical unit directory entry, process the parent
* to get the values. */
if (ud->flags & UNIT_DIRECTORY_LUN_DIRECTORY) {
Expand Down Expand Up @@ -2447,19 +2471,23 @@ static int sbp2scsi_slave_alloc(struct scsi_device *sdev)

scsi_id->sdev = sdev;

if (force_inquiry_hack ||
scsi_id->workarounds & SBP2_BREAKAGE_INQUIRY_HACK) {
if (scsi_id->workarounds & SBP2_WORKAROUND_INQUIRY_36)
sdev->inquiry_len = 36;
sdev->skip_ms_page_8 = 1;
}
return 0;
}

static int sbp2scsi_slave_configure(struct scsi_device *sdev)
{
struct scsi_id_instance_data *scsi_id =
(struct scsi_id_instance_data *)sdev->host->hostdata[0];

blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
sdev->use_10_for_rw = 1;
sdev->use_10_for_ms = 1;

if (sdev->type == TYPE_DISK &&
scsi_id->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
sdev->skip_ms_page_8 = 1;
return 0;
}

Expand Down Expand Up @@ -2603,7 +2631,9 @@ static int sbp2_module_init(void)
scsi_driver_template.cmd_per_lun = 1;
}

/* Set max sectors (module load option). Default is 255 sectors. */
if (sbp2_default_workarounds & SBP2_WORKAROUND_128K_MAX_TRANS &&
(max_sectors * 512) > (128 * 1024))
max_sectors = 128 * 1024 / 512;
scsi_driver_template.max_sectors = max_sectors;

/* Register our high level driver with 1394 stack */
Expand Down
16 changes: 6 additions & 10 deletions drivers/ieee1394/sbp2.h
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Original file line number Diff line number Diff line change
Expand Up @@ -226,11 +226,6 @@ struct sbp2_status_block {
#define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
#define SBP2_SW_VERSION_ENTRY 0x00010483

/*
* Other misc defines
*/
#define SBP2_128KB_BROKEN_FIRMWARE 0xa0b800

/*
* SCSI specific stuff
*/
Expand All @@ -239,6 +234,11 @@ struct sbp2_status_block {
#define SBP2_MAX_SECTORS 255 /* Max sectors supported */
#define SBP2_MAX_CMDS 8 /* This should be safe */

/* Flags for detected oddities and brokeness */
#define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
#define SBP2_WORKAROUND_INQUIRY_36 0x2
#define SBP2_WORKAROUND_MODE_SENSE_8 0x4

/* This is the two dma types we use for cmd_dma below */
enum cmd_dma_types {
CMD_DMA_NONE,
Expand Down Expand Up @@ -268,10 +268,6 @@ struct sbp2_command_info {

};

/* A list of flags for detected oddities and brokeness. */
#define SBP2_BREAKAGE_128K_MAX_TRANSFER 0x1
#define SBP2_BREAKAGE_INQUIRY_HACK 0x2

struct sbp2scsi_host_info;

/*
Expand Down Expand Up @@ -345,7 +341,7 @@ struct scsi_id_instance_data {
struct Scsi_Host *scsi_host;

/* Device specific workarounds/brokeness */
u32 workarounds;
unsigned workarounds;
};

/* Sbp2 host data structure (one per IEEE1394 host) */
Expand Down

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