* and many others.
*/
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
-#include <linux/mod_devicetable.h>
-#include <linux/device.h>
#include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
-#include <linux/blkdev.h>
#include <linux/string.h>
#include <linux/stringify.h>
#include <linux/timer.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
-#include "fw-transaction.h"
-#include "fw-topology.h"
#include "fw-device.h"
+#include "fw-topology.h"
+#include "fw-transaction.h"
/*
* So far only bridges from Oxford Semiconductor are known to support
* Avoids access beyond actual disk limits on devices with an off-by-one bug.
* Don't use this with devices which don't have this bug.
*
+ * - delay inquiry
+ * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry.
+ *
* - override internal blacklist
* Instead of adding to the built-in blacklist, use only the workarounds
* specified in the module load parameter.
#define SBP2_WORKAROUND_INQUIRY_36 0x2
#define SBP2_WORKAROUND_MODE_SENSE_8 0x4
#define SBP2_WORKAROUND_FIX_CAPACITY 0x8
+#define SBP2_WORKAROUND_DELAY_INQUIRY 0x10
+#define SBP2_INQUIRY_DELAY 12
#define SBP2_WORKAROUND_OVERRIDE 0x100
static int sbp2_param_workarounds;
", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36)
", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
+ ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY)
", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
", or a combination)");
int generation;
int retries;
struct delayed_work work;
+ bool blocked;
};
/*
struct sbp2_target {
struct kref kref;
struct fw_unit *unit;
+ const char *bus_id;
+ struct list_head lu_list;
u64 management_agent_address;
int directory_id;
int node_id;
int address_high;
-
- unsigned workarounds;
- struct list_head lu_list;
-
+ unsigned int workarounds;
unsigned int mgt_orb_timeout;
+
+ int dont_block; /* counter for each logical unit */
+ int blocked; /* ditto */
};
/*
*/
#define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */
#define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */
-#define SBP2_ORB_TIMEOUT 2000 /* Timeout in ms */
+#define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */
#define SBP2_ORB_NULL 0x80000000
#define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
static const struct {
u32 firmware_revision;
u32 model;
- unsigned workarounds;
+ unsigned int workarounds;
} sbp2_workarounds_table[] = {
/* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
.firmware_revision = 0x002800,
.workarounds = SBP2_WORKAROUND_INQUIRY_36 |
SBP2_WORKAROUND_MODE_SENSE_8,
},
+ /* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
+ .firmware_revision = 0x002800,
+ .model = 0x000000,
+ .workarounds = SBP2_WORKAROUND_DELAY_INQUIRY,
+ },
/* Initio bridges, actually only needed for some older ones */ {
.firmware_revision = 0x000200,
.model = ~0,
unsigned int timeout;
int retval = -ENOMEM;
+ if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device))
+ return 0;
+
orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
if (orb == NULL)
return -ENOMEM;
retval = -EIO;
if (sbp2_cancel_orbs(lu) == 0) {
- fw_error("orb reply timed out, rcode=0x%02x\n",
- orb->base.rcode);
+ fw_error("%s: orb reply timed out, rcode=0x%02x\n",
+ lu->tgt->bus_id, orb->base.rcode);
goto out;
}
if (orb->base.rcode != RCODE_COMPLETE) {
- fw_error("management write failed, rcode 0x%02x\n",
- orb->base.rcode);
+ fw_error("%s: management write failed, rcode 0x%02x\n",
+ lu->tgt->bus_id, orb->base.rcode);
goto out;
}
if (STATUS_GET_RESPONSE(orb->status) != 0 ||
STATUS_GET_SBP_STATUS(orb->status) != 0) {
- fw_error("error status: %d:%d\n",
+ fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id,
STATUS_GET_RESPONSE(orb->status),
STATUS_GET_SBP_STATUS(orb->status));
goto out;
static void
complete_agent_reset_write(struct fw_card *card, int rcode,
- void *payload, size_t length, void *data)
+ void *payload, size_t length, void *done)
+{
+ complete(done);
+}
+
+static void sbp2_agent_reset(struct sbp2_logical_unit *lu)
{
- struct fw_transaction *t = data;
+ struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
+ DECLARE_COMPLETION_ONSTACK(done);
+ struct fw_transaction t;
+ static u32 z;
+
+ fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST,
+ lu->tgt->node_id, lu->generation, device->max_speed,
+ lu->command_block_agent_address + SBP2_AGENT_RESET,
+ &z, sizeof(z), complete_agent_reset_write, &done);
+ wait_for_completion(&done);
+}
- kfree(t);
+static void
+complete_agent_reset_write_no_wait(struct fw_card *card, int rcode,
+ void *payload, size_t length, void *data)
+{
+ kfree(data);
}
-static int sbp2_agent_reset(struct sbp2_logical_unit *lu)
+static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
{
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
struct fw_transaction *t;
- static u32 zero;
+ static u32 z;
- t = kzalloc(sizeof(*t), GFP_ATOMIC);
+ t = kmalloc(sizeof(*t), GFP_ATOMIC);
if (t == NULL)
- return -ENOMEM;
+ return;
fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
lu->tgt->node_id, lu->generation, device->max_speed,
lu->command_block_agent_address + SBP2_AGENT_RESET,
- &zero, sizeof(zero), complete_agent_reset_write, t);
+ &z, sizeof(z), complete_agent_reset_write_no_wait, t);
+}
- return 0;
+static void sbp2_set_generation(struct sbp2_logical_unit *lu, int generation)
+{
+ struct fw_card *card = fw_device(lu->tgt->unit->device.parent)->card;
+ unsigned long flags;
+
+ /* serialize with comparisons of lu->generation and card->generation */
+ spin_lock_irqsave(&card->lock, flags);
+ lu->generation = generation;
+ spin_unlock_irqrestore(&card->lock, flags);
+}
+
+static inline void sbp2_allow_block(struct sbp2_logical_unit *lu)
+{
+ /*
+ * We may access dont_block without taking card->lock here:
+ * All callers of sbp2_allow_block() and all callers of sbp2_unblock()
+ * are currently serialized against each other.
+ * And a wrong result in sbp2_conditionally_block()'s access of
+ * dont_block is rather harmless, it simply misses its first chance.
+ */
+ --lu->tgt->dont_block;
+}
+
+/*
+ * Blocks lu->tgt if all of the following conditions are met:
+ * - Login, INQUIRY, and high-level SCSI setup of all of the target's
+ * logical units have been finished (indicated by dont_block == 0).
+ * - lu->generation is stale.
+ *
+ * Note, scsi_block_requests() must be called while holding card->lock,
+ * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
+ * unblock the target.
+ */
+static void sbp2_conditionally_block(struct sbp2_logical_unit *lu)
+{
+ struct sbp2_target *tgt = lu->tgt;
+ struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
+ struct Scsi_Host *shost =
+ container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->lock, flags);
+ if (!tgt->dont_block && !lu->blocked &&
+ lu->generation != card->generation) {
+ lu->blocked = true;
+ if (++tgt->blocked == 1) {
+ scsi_block_requests(shost);
+ fw_notify("blocked %s\n", lu->tgt->bus_id);
+ }
+ }
+ spin_unlock_irqrestore(&card->lock, flags);
+}
+
+/*
+ * Unblocks lu->tgt as soon as all its logical units can be unblocked.
+ * Note, it is harmless to run scsi_unblock_requests() outside the
+ * card->lock protected section. On the other hand, running it inside
+ * the section might clash with shost->host_lock.
+ */
+static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu)
+{
+ struct sbp2_target *tgt = lu->tgt;
+ struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
+ struct Scsi_Host *shost =
+ container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
+ unsigned long flags;
+ bool unblock = false;
+
+ spin_lock_irqsave(&card->lock, flags);
+ if (lu->blocked && lu->generation == card->generation) {
+ lu->blocked = false;
+ unblock = --tgt->blocked == 0;
+ }
+ spin_unlock_irqrestore(&card->lock, flags);
+
+ if (unblock) {
+ scsi_unblock_requests(shost);
+ fw_notify("unblocked %s\n", lu->tgt->bus_id);
+ }
+}
+
+/*
+ * Prevents future blocking of tgt and unblocks it.
+ * Note, it is harmless to run scsi_unblock_requests() outside the
+ * card->lock protected section. On the other hand, running it inside
+ * the section might clash with shost->host_lock.
+ */
+static void sbp2_unblock(struct sbp2_target *tgt)
+{
+ struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
+ struct Scsi_Host *shost =
+ container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->lock, flags);
+ ++tgt->dont_block;
+ spin_unlock_irqrestore(&card->lock, flags);
+
+ scsi_unblock_requests(shost);
}
static void sbp2_release_target(struct kref *kref)
struct sbp2_logical_unit *lu, *next;
struct Scsi_Host *shost =
container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
- struct fw_device *device = fw_device(tgt->unit->device.parent);
+
+ /* prevent deadlocks */
+ sbp2_unblock(tgt);
list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
- if (lu->sdev)
+ if (lu->sdev) {
scsi_remove_device(lu->sdev);
-
- if (!fw_device_is_shutdown(device))
- sbp2_send_management_orb(lu, tgt->node_id,
- lu->generation, SBP2_LOGOUT_REQUEST,
- lu->login_id, NULL);
+ scsi_device_put(lu->sdev);
+ }
+ sbp2_send_management_orb(lu, tgt->node_id, lu->generation,
+ SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
fw_core_remove_address_handler(&lu->address_handler);
list_del(&lu->link);
kfree(lu);
}
scsi_remove_host(shost);
- fw_notify("released %s\n", tgt->unit->device.bus_id);
+ fw_notify("released %s\n", tgt->bus_id);
put_device(&tgt->unit->device);
scsi_host_put(shost);
{
struct sbp2_logical_unit *lu =
container_of(work, struct sbp2_logical_unit, work.work);
- struct Scsi_Host *shost =
- container_of((void *)lu->tgt, struct Scsi_Host, hostdata[0]);
+ struct sbp2_target *tgt = lu->tgt;
+ struct fw_device *device = fw_device(tgt->unit->device.parent);
+ struct Scsi_Host *shost;
struct scsi_device *sdev;
struct scsi_lun eight_bytes_lun;
- struct fw_unit *unit = lu->tgt->unit;
- struct fw_device *device = fw_device(unit->device.parent);
struct sbp2_login_response response;
int generation, node_id, local_node_id;
+ if (fw_device_is_shutdown(device))
+ goto out;
+
generation = device->generation;
smp_rmb(); /* node_id must not be older than generation */
node_id = device->node_id;
local_node_id = device->card->node_id;
+ /* If this is a re-login attempt, log out, or we might be rejected. */
+ if (lu->sdev)
+ sbp2_send_management_orb(lu, device->node_id, generation,
+ SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
+
if (sbp2_send_management_orb(lu, node_id, generation,
SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
- if (lu->retries++ < 5)
+ if (lu->retries++ < 5) {
sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
- else
- fw_error("failed to login to %s LUN %04x\n",
- unit->device.bus_id, lu->lun);
+ } else {
+ fw_error("%s: failed to login to LUN %04x\n",
+ tgt->bus_id, lu->lun);
+ /* Let any waiting I/O fail from now on. */
+ sbp2_unblock(lu->tgt);
+ }
goto out;
}
- lu->generation = generation;
- lu->tgt->node_id = node_id;
- lu->tgt->address_high = local_node_id << 16;
+ tgt->node_id = node_id;
+ tgt->address_high = local_node_id << 16;
+ sbp2_set_generation(lu, generation);
/* Get command block agent offset and login id. */
lu->command_block_agent_address =
response.command_block_agent.low;
lu->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
- fw_notify("logged in to %s LUN %04x (%d retries)\n",
- unit->device.bus_id, lu->lun, lu->retries);
+ fw_notify("%s: logged in to LUN %04x (%d retries)\n",
+ tgt->bus_id, lu->lun, lu->retries);
#if 0
/* FIXME: The linux1394 sbp2 does this last step. */
PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect);
sbp2_agent_reset(lu);
+ /* This was a re-login. */
+ if (lu->sdev) {
+ sbp2_cancel_orbs(lu);
+ sbp2_conditionally_unblock(lu);
+ goto out;
+ }
+
+ if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY)
+ ssleep(SBP2_INQUIRY_DELAY);
+
memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
eight_bytes_lun.scsi_lun[0] = (lu->lun >> 8) & 0xff;
eight_bytes_lun.scsi_lun[1] = lu->lun & 0xff;
+ shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
sdev = __scsi_add_device(shost, 0, 0,
scsilun_to_int(&eight_bytes_lun), lu);
- if (IS_ERR(sdev)) {
- sbp2_send_management_orb(lu, node_id, generation,
- SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
- /*
- * Set this back to sbp2_login so we fall back and
- * retry login on bus reset.
- */
- PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
- } else {
- lu->sdev = sdev;
+ /*
+ * FIXME: We are unable to perform reconnects while in sbp2_login().
+ * Therefore __scsi_add_device() will get into trouble if a bus reset
+ * happens in parallel. It will either fail or leave us with an
+ * unusable sdev. As a workaround we check for this and retry the
+ * whole login and SCSI probing.
+ */
+
+ /* Reported error during __scsi_add_device() */
+ if (IS_ERR(sdev))
+ goto out_logout_login;
+
+ /* Unreported error during __scsi_add_device() */
+ smp_rmb(); /* get current card generation */
+ if (generation != device->card->generation) {
+ scsi_remove_device(sdev);
scsi_device_put(sdev);
+ goto out_logout_login;
}
+
+ /* No error during __scsi_add_device() */
+ lu->sdev = sdev;
+ sbp2_allow_block(lu);
+ goto out;
+
+ out_logout_login:
+ smp_rmb(); /* generation may have changed */
+ generation = device->generation;
+ smp_rmb(); /* node_id must not be older than generation */
+
+ sbp2_send_management_orb(lu, device->node_id, generation,
+ SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
+ /*
+ * If a bus reset happened, sbp2_update will have requeued
+ * lu->work already. Reset the work from reconnect to login.
+ */
+ PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
out:
- sbp2_target_put(lu->tgt);
+ sbp2_target_put(tgt);
}
static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
lu->sdev = NULL;
lu->lun = lun_entry & 0xffff;
lu->retries = 0;
+ lu->blocked = false;
+ ++tgt->dont_block;
INIT_LIST_HEAD(&lu->orb_list);
INIT_DELAYED_WORK(&lu->work, sbp2_login);
if (timeout > tgt->mgt_orb_timeout)
fw_notify("%s: config rom contains %ds "
"management ORB timeout, limiting "
- "to %ds\n", tgt->unit->device.bus_id,
+ "to %ds\n", tgt->bus_id,
timeout / 1000,
tgt->mgt_orb_timeout / 1000);
break;
u32 firmware_revision)
{
int i;
- unsigned w = sbp2_param_workarounds;
+ unsigned int w = sbp2_param_workarounds;
if (w)
fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
"if you need the workarounds parameter for %s\n",
- tgt->unit->device.bus_id);
+ tgt->bus_id);
if (w & SBP2_WORKAROUND_OVERRIDE)
goto out;
if (w)
fw_notify("Workarounds for %s: 0x%x "
"(firmware_revision 0x%06x, model_id 0x%06x)\n",
- tgt->unit->device.bus_id,
- w, firmware_revision, model);
+ tgt->bus_id, w, firmware_revision, model);
tgt->workarounds = w;
}
tgt->unit = unit;
kref_init(&tgt->kref);
INIT_LIST_HEAD(&tgt->lu_list);
+ tgt->bus_id = unit->device.bus_id;
if (fw_device_enable_phys_dma(device) < 0)
goto fail_shost_put;
{
struct sbp2_logical_unit *lu =
container_of(work, struct sbp2_logical_unit, work.work);
- struct fw_unit *unit = lu->tgt->unit;
- struct fw_device *device = fw_device(unit->device.parent);
+ struct sbp2_target *tgt = lu->tgt;
+ struct fw_device *device = fw_device(tgt->unit->device.parent);
int generation, node_id, local_node_id;
+ if (fw_device_is_shutdown(device))
+ goto out;
+
generation = device->generation;
smp_rmb(); /* node_id must not be older than generation */
node_id = device->node_id;
if (sbp2_send_management_orb(lu, node_id, generation,
SBP2_RECONNECT_REQUEST,
lu->login_id, NULL) < 0) {
- if (lu->retries++ >= 5) {
- fw_error("failed to reconnect to %s\n",
- unit->device.bus_id);
- /* Fall back and try to log in again. */
+ /*
+ * If reconnect was impossible even though we are in the
+ * current generation, fall back and try to log in again.
+ *
+ * We could check for "Function rejected" status, but
+ * looking at the bus generation as simpler and more general.
+ */
+ smp_rmb(); /* get current card generation */
+ if (generation == device->card->generation ||
+ lu->retries++ >= 5) {
+ fw_error("%s: failed to reconnect\n", tgt->bus_id);
lu->retries = 0;
PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
}
goto out;
}
- lu->generation = generation;
- lu->tgt->node_id = node_id;
- lu->tgt->address_high = local_node_id << 16;
+ tgt->node_id = node_id;
+ tgt->address_high = local_node_id << 16;
+ sbp2_set_generation(lu, generation);
- fw_notify("reconnected to %s LUN %04x (%d retries)\n",
- unit->device.bus_id, lu->lun, lu->retries);
+ fw_notify("%s: reconnected to LUN %04x (%d retries)\n",
+ tgt->bus_id, lu->lun, lu->retries);
sbp2_agent_reset(lu);
sbp2_cancel_orbs(lu);
+ sbp2_conditionally_unblock(lu);
out:
- sbp2_target_put(lu->tgt);
+ sbp2_target_put(tgt);
}
static void sbp2_update(struct fw_unit *unit)
* Iteration over tgt->lu_list is therefore safe here.
*/
list_for_each_entry(lu, &tgt->lu_list, link) {
+ sbp2_conditionally_block(lu);
lu->retries = 0;
sbp2_queue_work(lu, 0);
}
if (status != NULL) {
if (STATUS_GET_DEAD(*status))
- sbp2_agent_reset(orb->lu);
+ sbp2_agent_reset_no_wait(orb->lu);
switch (STATUS_GET_RESPONSE(*status)) {
case SBP2_STATUS_REQUEST_COMPLETE:
* or when sending the write (less likely).
*/
result = DID_BUS_BUSY << 16;
+ sbp2_conditionally_block(orb->lu);
}
dma_unmap_single(device->card->device, orb->base.request_bus,
struct sbp2_logical_unit *lu = cmd->device->hostdata;
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
struct sbp2_command_orb *orb;
- unsigned max_payload;
+ unsigned int max_payload;
int retval = SCSI_MLQUEUE_HOST_BUSY;
/*
{
struct sbp2_logical_unit *lu = sdev->hostdata;
+ /* (Re-)Adding logical units via the SCSI stack is not supported. */
+ if (!lu)
+ return -ENOSYS;
+
sdev->allow_restart = 1;
/*
{
struct sbp2_logical_unit *lu = cmd->device->hostdata;
- fw_notify("sbp2_scsi_abort\n");
+ fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id);
sbp2_agent_reset(lu);
sbp2_cancel_orbs(lu);
projects / linux-2.6-block.git / commitdiff