3 files changed, 106 insertions, 71 deletions

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 421bcfff6ad2..43ab119963d5 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -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+Why:    Superceded by parameter "workarounds".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
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index f4206604db03..ecd59ef8c8a3 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -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>
@@ -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
@@ -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.
@@ -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,
+        }
 };
 
 /**************************************
@@ -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();
@@ -1506,12 +1539,8 @@ 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:
@@ -1519,42 +1548,37 @@ static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id,
                 }
         }
 
-        /* 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) {
@@ -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;
 }
 
@@ -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 */
diff --git a/drivers/ieee1394/sbp2.h b/drivers/ieee1394/sbp2.h
index e2d357a9ea3a..e40caf5d61ac 100644
--- a/drivers/ieee1394/sbp2.h
+++ b/drivers/ieee1394/sbp2.h
@@ -227,11 +227,6 @@ struct sbp2_status_block {
 #define SBP2_SW_VERSION_ENTRY                                   0x00010483
 
 /*
- * Other misc defines
- */
-#define SBP2_128KB_BROKEN_FIRMWARE                              0xa0b800
-
-/*
  * SCSI specific stuff
  */
 
@@ -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,
@@ -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;
 
 /*
@@ -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) */