ieee1394: sbp2: update comment on things to do
Some people actually look at those comments. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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@ -29,13 +29,27 @@
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* driver. It also registers as a SCSI lower-level driver in order to accept
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* SCSI commands for transport using SBP-2.
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*
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* You may access any attached SBP-2 storage devices as if they were SCSI
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* devices (e.g. mount /dev/sda1, fdisk, mkfs, etc.).
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* You may access any attached SBP-2 (usually storage devices) as regular
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* SCSI devices. E.g. mount /dev/sda1, fdisk, mkfs, etc..
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*
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* Current Issues:
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* See http://www.t10.org/drafts.htm#sbp2 for the final draft of the SBP-2
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* specification and for where to purchase the official standard.
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*
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* - Error Handling: SCSI aborts and bus reset requests are handled somewhat
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* but the code needs additional debugging.
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* TODO:
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* - look into possible improvements of the SCSI error handlers
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* - handle Unit_Characteristics.mgt_ORB_timeout and .ORB_size
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* - handle Logical_Unit_Number.ordered
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* - handle src == 1 in status blocks
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* - reimplement the DMA mapping in absence of physical DMA so that
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* bus_to_virt is no longer required
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* - debug the handling of absent physical DMA
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* - replace CONFIG_IEEE1394_SBP2_PHYS_DMA by automatic detection
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* (this is easy but depends on the previous two TODO items)
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* - make the parameter serialize_io configurable per device
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* - move all requests to fetch agent registers into non-atomic context,
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* replace all usages of sbp2util_node_write_no_wait by true transactions
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* - convert to generic DMA mapping API to eliminate dependency on PCI
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* Grep for inline FIXME comments below.
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*/
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#include <linux/blkdev.h>
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@ -107,8 +121,6 @@ MODULE_PARM_DESC(max_speed, "Force max speed "
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* Set serialize_io to 1 if you'd like only one scsi command sent
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* down to us at a time (debugging). This might be necessary for very
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* badly behaved sbp2 devices.
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*
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* TODO: Make this configurable per device.
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*/
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static int sbp2_serialize_io = 1;
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module_param_named(serialize_io, sbp2_serialize_io, int, 0444);
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