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path: root/drivers/ieee1394/sbp2.c
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Diffstat (limited to 'drivers/ieee1394/sbp2.c')
-rw-r--r--drivers/ieee1394/sbp2.c71
1 files changed, 66 insertions, 5 deletions
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index 668b4512def..c4d30a7b8b1 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -465,6 +465,44 @@ static int sbp2util_node_write_no_wait(struct node_entry *ne, u64 addr,
return 0;
}
+static void sbp2util_notify_fetch_agent(struct scsi_id_instance_data *scsi_id,
+ u64 offset, quadlet_t *data, size_t len)
+{
+ /*
+ * There is a small window after a bus reset within which the node
+ * entry's generation is current but the reconnect wasn't completed.
+ */
+ if (atomic_read(&scsi_id->unfinished_reset))
+ return;
+
+ if (hpsb_node_write(scsi_id->ne,
+ scsi_id->sbp2_command_block_agent_addr + offset,
+ data, len))
+ SBP2_ERR("sbp2util_notify_fetch_agent failed.");
+ /*
+ * Now accept new SCSI commands, unless a bus reset happended during
+ * hpsb_node_write.
+ */
+ if (!atomic_read(&scsi_id->unfinished_reset))
+ scsi_unblock_requests(scsi_id->scsi_host);
+}
+
+static void sbp2util_write_orb_pointer(void *p)
+{
+ quadlet_t data[2];
+
+ data[0] = ORB_SET_NODE_ID(
+ ((struct scsi_id_instance_data *)p)->hi->host->node_id);
+ data[1] = ((struct scsi_id_instance_data *)p)->last_orb_dma;
+ sbp2util_cpu_to_be32_buffer(data, 8);
+ sbp2util_notify_fetch_agent(p, SBP2_ORB_POINTER_OFFSET, data, 8);
+}
+
+static void sbp2util_write_doorbell(void *p)
+{
+ sbp2util_notify_fetch_agent(p, SBP2_DOORBELL_OFFSET, NULL, 4);
+}
+
/*
* This function is called to create a pool of command orbs used for
* command processing. It is called when a new sbp2 device is detected.
@@ -712,6 +750,7 @@ static int sbp2_remove(struct device *dev)
sbp2scsi_complete_all_commands(scsi_id, DID_NO_CONNECT);
/* scsi_remove_device() will trigger shutdown functions of SCSI
* highlevel drivers which would deadlock if blocked. */
+ atomic_set(&scsi_id->unfinished_reset, 0);
scsi_unblock_requests(scsi_id->scsi_host);
}
sdev = scsi_id->sdev;
@@ -765,6 +804,7 @@ static int sbp2_update(struct unit_directory *ud)
/* Make sure we unblock requests (since this is likely after a bus
* reset). */
+ atomic_set(&scsi_id->unfinished_reset, 0);
scsi_unblock_requests(scsi_id->scsi_host);
return 0;
@@ -795,6 +835,8 @@ static struct scsi_id_instance_data *sbp2_alloc_device(struct unit_directory *ud
INIT_LIST_HEAD(&scsi_id->sbp2_command_orb_completed);
INIT_LIST_HEAD(&scsi_id->scsi_list);
spin_lock_init(&scsi_id->sbp2_command_orb_lock);
+ atomic_set(&scsi_id->unfinished_reset, 0);
+ INIT_WORK(&scsi_id->protocol_work, NULL, NULL);
ud->device.driver_data = scsi_id;
@@ -879,8 +921,10 @@ static void sbp2_host_reset(struct hpsb_host *host)
hi = hpsb_get_hostinfo(&sbp2_highlevel, host);
if (hi) {
- list_for_each_entry(scsi_id, &hi->scsi_ids, scsi_list)
+ list_for_each_entry(scsi_id, &hi->scsi_ids, scsi_list) {
+ atomic_set(&scsi_id->unfinished_reset, 1);
scsi_block_requests(scsi_id->scsi_host);
+ }
}
}
@@ -1032,7 +1076,7 @@ static void sbp2_remove_device(struct scsi_id_instance_data *scsi_id)
scsi_remove_host(scsi_id->scsi_host);
scsi_host_put(scsi_id->scsi_host);
}
-
+ flush_scheduled_work();
sbp2util_remove_command_orb_pool(scsi_id);
list_del(&scsi_id->scsi_list);
@@ -1661,6 +1705,10 @@ static int sbp2_agent_reset(struct scsi_id_instance_data *scsi_id, int wait)
SBP2_DEBUG_ENTER();
+ cancel_delayed_work(&scsi_id->protocol_work);
+ if (wait)
+ flush_scheduled_work();
+
data = ntohl(SBP2_AGENT_RESET_DATA);
addr = scsi_id->sbp2_command_block_agent_addr + SBP2_AGENT_RESET_OFFSET;
@@ -1982,9 +2030,22 @@ static void sbp2_link_orb_command(struct scsi_id_instance_data *scsi_id,
SBP2_ORB_DEBUG("write to %s register, command orb %p",
last_orb ? "DOORBELL" : "ORB_POINTER", command_orb);
- if (sbp2util_node_write_no_wait(scsi_id->ne, addr, data, length))
- SBP2_ERR("sbp2util_node_write_no_wait failed.\n");
- /* We rely on SCSI EH to deal with _node_write_ failures. */
+ if (sbp2util_node_write_no_wait(scsi_id->ne, addr, data, length)) {
+ /*
+ * sbp2util_node_write_no_wait failed. We certainly ran out
+ * of transaction labels, perhaps just because there were no
+ * context switches which gave khpsbpkt a chance to collect
+ * free tlabels. Try again in non-atomic context. If necessary,
+ * the workqueue job will sleep to guaranteedly get a tlabel.
+ * We do not accept new commands until the job is over.
+ */
+ scsi_block_requests(scsi_id->scsi_host);
+ PREPARE_WORK(&scsi_id->protocol_work,
+ last_orb ? sbp2util_write_doorbell:
+ sbp2util_write_orb_pointer,
+ scsi_id);
+ schedule_work(&scsi_id->protocol_work);
+ }
}
/*