Commit Graph

59 Commits

Author SHA1 Message Date
Stefan Richter 7889b60ee7 firewire: core: optimize propagation of BROADCAST_CHANNEL
Cache the test result of whether a device implements BROADCAST_CHANNEL.
This minimizes traffic on the bus after each bus reset.  A majority of
devices does not implement BROADCAST_CHANNEL.

Remove busy retries; just rely on the hardware to retry requests to busy
responders.  Remove unnecessary log messages.

Rename the flag is_irm to broadcast_channel_allocated to better reflect
its meaning.  Reset the flag earlier in fw_core_handle_bus_reset.

Pass the generation down as a call parameter; that way generation can't
be newer than card->broadcast_channel_allocated and device->node_id.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:52 +01:00
Stefan Richter 18e9b10fcd firewire: cdev: add closure to async stream ioctl
This changes the as yet unreleased FW_CDEV_IOC_SEND_STREAM_PACKET ioctl
to generate an fw_cdev_event_response event just like the other two
ioctls for asynchronous request transmission do.  This way, clients get
feedback on successful or unsuccessful transmission.

This also adds input validation for length, tag, channel, sy, speed.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:50 +01:00
Jay Fenlason 6104ee92d6 firewire: broadcast channel support
This patch adds the ISO broadcast channel support that is required of a
1394a IRM.  In specific, if the local device the IRM, it allocates ISO
channel 31 and sets the broadcast channel register of all devices on the
local bus to BROADCAST_CHANNEL_INITIAL | BROADCAST_CHANNEL_VALID to indicate
that channel 31 can be use for broadcast messages.

One minor complication is that on startup the local device may become IRM
before all the devices on the bus have been enumerated by the stack.  Therefore
we have to keep a "the local device is IRM" flag and possibly set the
broadcast channel register of new devices at enumeration time.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:49 +01:00
Jay Fenlason f8c2287c65 firewire: implement asynchronous stream transmission
Allow userspace and other firewire drivers (fw-ipv4 I'm looking at
you!) to send Asynchronous Transmit Streams as described in 7.8.3 of
release 1.1 of the 1394 Open Host Controller Interface Specification.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (tweaks)
2009-03-24 20:56:49 +01:00
Stefan Richter ba27e1f7bf firewire: core: normalize a function argument name
It's called "payload" rather than "data" almost everywhere in
fw-transaction.c.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:48 +01:00
Jay Fenlason, Stefan Richter b1bda4cdc2 firewire: cdev: add ioctls for isochronous resource management
Based on
    Date: Tue, 18 Nov 2008 11:41:27 -0500
    From: Jay Fenlason <fenlason@redhat.com>
    Subject: [Patch V4] Add ISO resource management support
with several changes to the ABI and implementation.  Only the part of
the ABI which enables auto-reallocation and auto-deallocation is
included here.

This implements ioctls for kernel-assisted allocation of isochronous
channels and isochronous bandwidth.  The benefits are:
  - The client does not have to have write access to the /dev/fw* device
    corresponding to the IRM.
  - The client does not have to perform reallocation after bus resets.
  - Channel and bandwidth are deallocated by the kernel if the file is
    closed before the client deallocated the resources.  Thus resources
    are released even if the client crashes.

It is anticipated that future in-kernel code (firewire-core IRM code;
the firewire port of firedtv), will use the fw-iso.c portions of this
code too.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: David Moore <dcm@acm.org>
2009-03-24 20:56:43 +01:00
Stefan Richter 4817ed2402 firewire: prevent creation of multiple IR DMA contexts for the same channel
OHCI-1394 1.1 clause 10.4.3 says:  "If more than one IR DMA context
specifies receives for packets from the same isochronous channel, the
context destination for that channel's packets is undefined."

Any userspace client and in the future also kernelspace clients can
allocate IR DMA contexts for any channel.  We don't want them to
interfere with each other, hence it is preferable to return -EBUSY if
allocation of a second context for a channel is attempted.

Notes:
  - This limitation is OHCI-1394 specific, therefore its proper place of
    implementation is down in the low-level driver.

  - Since the <linux/firewire-cdev.h> ABI simply maps one userspace iso
    client context to one hardware iso context, this OHCI-1394
    limitation alas requires userspace to implement its own multiplexing
    of iso reception from the same channel and card to multiple clients
    when needed.

  - The limitation is independent of channel allocation at the IRM; the
    latter is really only important for the initiation of iso 
    transmission but not of iso reception.

  - We don't need to do the same for IT DMA because OHCI-1394 does not
    have any ties between IT contexts and channels.  Only the voluntary
    channel allocation protocol via the IRM, globally to the FireWire
    bus, can ensure proper isochronous transmit behaviour anyway.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:41 +01:00
Stefan Richter da62df141e firewire: core: remove unused definitions
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:40 +01:00
Stefan Richter 53dca51175 firewire: remove line breaks before function names
type
    function_name(parameters);

is nice to look at but was not used consistently.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-03-24 20:56:40 +01:00
Stefan Richter 8cd0bbbdff firewire: unnecessary BM delay after generation rollover
Noticed by Jarod Wilson:  The bus manager work was unnecessarily delayed
each time the bus generation counter rolled over.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
2009-01-20 19:29:51 +01:00
Stefan Richter c8a12d45d5 firewire: reorder struct fw_card for better cache efficiency
topology_map is by far the largest member in struct fw_card.  Move it to
the very end of the struct so that card pointer dereferences have better
chances to hit the CPU cache.

This requires to increase the topology_map backing store to the size
specified in IEEE 1394, i.e. 256 rather than 255 quadlets.  Otherwise
the topology_map response handler may access invalid memory.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-01-04 23:50:38 +01:00
Stefan Richter d6f95a3d14 firewire: fix resetting of bus manager retry counter
An earlier change, maybe long ago, removed the copying of self_id_count
into card->self_id_count.  Since then each bus reset cleared
card->bm_retries even when it shouldn't.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-01-04 23:50:38 +01:00
Jay Fenlason 0fa1986f3a firewire: improve refcounting of fw_card
Take a reference to the card whenever fw_card_bm_work() is scheduled on
that card and release it when the work is done.  This allows us to
remove the cancel_delayed_work_sync() in fw_core_remove_card().

Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (patch update)
2009-01-04 23:50:37 +01:00
Stefan Richter 1d1dc5e83f firewire: fw-ohci: fix IOMMU resource exhaustion
There is a DMA map/ unmap imbalance whenever a block write request
packet is sent and then dequeued with ohci_cancel_packet.  The latter
may happen frequently if the AR resp tasklet is executed before the AT
req tasklet for the same transaction.

Add the missing dma_unmap_single.  This fixes
https://bugzilla.redhat.com/show_bug.cgi?id=475156

Reported-by: Emmanuel Kowalski
Tested-by: Emmanuel Kowalski
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-12-10 12:45:34 +01:00
Jay Fenlason 4f9740d4f5 firewire: Survive more than 256 bus resets
The "color" is used during the topology building after a bus reset,
hovever in "struct fw_node"s it is stored in a u8, but in struct fw_card
it is stored in an int.  When the value wraps in one struct, but not
the other, disaster strikes.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=10922.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-10-26 10:26:59 +01:00
Jay Fenlason 1e119fa995 firewire: fw_send_request_sync()
Share code between fw_send_request + wait_for_completion callers.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>

Addendum:
Removes an unnecessary struct and an ununsed retry loop.
Calls it fw_run_transaction() instead of fw_send_request_sync().

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Kristian Høgsberg <krh@redhat.com>
2008-10-15 22:21:09 +02:00
Stefan Richter 459f79235d firewire: clean up fw_card reference counting
This is a functionally equivalent replacement of the current reference
counting of struct fw_card instances.  It only converts it to common
idioms as suggested by Kristian Høgsberg:
  - struct kref replaces atomic_t as the counter.
  - wait_for_completion is used to wait for all card users to complete.

BTW, it may make sense to count card->flush_timer and card->work as
card users too.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-07-14 13:06:03 +02:00
Stefan Richter 2147ef204f firewire: clean up some includes
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-07-14 13:06:03 +02:00
Stefan Richter bbf094cf3d firewire: remove unused struct members
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-07-14 13:06:03 +02:00
Stefan Richter e534fe16b9 firewire: implement broadcast_channel CSR for 1394a compliance
See IEEE 1394a clause 8.3.2.3.11.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-07-14 13:06:03 +02:00
Adrian Bunk db8be076ca firewire: cleanups
This patch contains the following cleanups:
- #if 0 the following unused structs:
  - fw-transaction.c:fw_low_memory_region
  - fw-transaction.c:fw_private_region
  - fw-transaction.c:fw_csr_region
  - fw-transaction.c:fw_unit_space_region
- remove the following unused EXPORT_SYMBOL's:
  - fw-card.c:fw_core_add_descriptor
  - fw-card.c:fw_core_remove_descriptor
  - fw-iso.c:fw_iso_context_create
  - fw-iso.c:fw_iso_context_destroy
  - fw-iso.c:fw_iso_context_start
  - fw-iso.c:fw_iso_context_queue
  - fw-iso.c:fw_iso_context_stop

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-04-18 17:55:37 +02:00
Stefan Richter e09770db0f firewire: remove unused struct member
request_generation is internal to fw-ohci and unneeded in fw_card.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-04-18 17:55:36 +02:00
Stefan Richter bd7dee6311 firewire: remove superfluous reference counting
The card->kref became obsolete since patch "firewire: fix crash in
automatic module unloading" added another counter of card users.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
2008-04-18 17:55:31 +02:00
Stefan Richter efbf390a2d firewire: endianess annotations
Kills warnings from 'make C=1 CHECKFLAGS="-D__CHECK_ENDIAN__" modules':

drivers/firewire/fw-transaction.c:771:10: warning: incorrect type in assignment (different base types)
drivers/firewire/fw-transaction.c:771:10:    expected unsigned int [unsigned] [usertype] <noident>
drivers/firewire/fw-transaction.c:771:10:    got restricted unsigned int [usertype] <noident>
drivers/firewire/fw-transaction.h:93:10: warning: incorrect type in assignment (different base types)
drivers/firewire/fw-transaction.h:93:10:    expected unsigned int [unsigned] [usertype] <noident>
drivers/firewire/fw-transaction.h:93:10:    got restricted unsigned int [usertype] <noident>
drivers/firewire/fw-ohci.c:1490:8: warning: restricted degrades to integer
drivers/firewire/fw-ohci.c:1490:35: warning: restricted degrades to integer
drivers/firewire/fw-ohci.c:1516:5: warning: cast to restricted type

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
2008-03-14 00:56:58 +01:00
Stefan Richter 855c603d61 firewire: fix crash in automatic module unloading
"modprobe firewire-ohci; sleep .1; modprobe -r firewire-ohci" used to
result in crashes like this:

    BUG: unable to handle kernel paging request at ffffffff8807b455
    IP: [<ffffffff8807b455>]
    PGD 203067 PUD 207063 PMD 7c170067 PTE 0
    Oops: 0010 [1] PREEMPT SMP
    CPU 0
    Modules linked in: i915 drm cpufreq_ondemand acpi_cpufreq freq_table applesmc input_polldev led_class coretemp hwmon eeprom snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss button thermal processor sg snd_hda_intel snd_pcm snd_timer snd snd_page_alloc sky2 i2c_i801 rtc [last unloaded: crc_itu_t]
    Pid: 9, comm: events/0 Not tainted 2.6.25-rc2 #3
    RIP: 0010:[<ffffffff8807b455>]  [<ffffffff8807b455>]
    RSP: 0018:ffff81007dcdde88  EFLAGS: 00010246
    RAX: ffff81007dc95040 RBX: ffff81007dee5390 RCX: 0000000000005e13
    RDX: 0000000000008c8b RSI: 0000000000000001 RDI: ffff81007dee5388
    RBP: ffff81007dc5eb40 R08: 0000000000000002 R09: ffffffff8022d05c
    R10: ffffffff8023b34c R11: ffffffff8041a353 R12: ffff81007dee5388
    R13: ffffffff8807b455 R14: ffffffff80593bc0 R15: 0000000000000000
    FS:  0000000000000000(0000) GS:ffffffff8055a000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    CR2: ffffffff8807b455 CR3: 0000000000201000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process events/0 (pid: 9, threadinfo ffff81007dcdc000, task ffff81007dc95040)
    Stack:  ffffffff8023b396 ffffffff88082524 0000000000000000 ffffffff8807d9ae
    ffff81007dc5eb40 ffff81007dc9dce0 ffff81007dc5eb40 ffff81007dc5eb80
    ffff81007dc9dce0 ffffffffffffffff ffffffff8023be87 0000000000000000
    Call Trace:
    [<ffffffff8023b396>] ? run_workqueue+0xdf/0x1df
    [<ffffffff8023be87>] ? worker_thread+0xd8/0xe3
    [<ffffffff8023e917>] ? autoremove_wake_function+0x0/0x2e
    [<ffffffff8023bdaf>] ? worker_thread+0x0/0xe3
    [<ffffffff8023e813>] ? kthread+0x47/0x74
    [<ffffffff804198e0>] ? trace_hardirqs_on_thunk+0x35/0x3a
    [<ffffffff8020c008>] ? child_rip+0xa/0x12
    [<ffffffff8020b6e3>] ? restore_args+0x0/0x3d
    [<ffffffff8023e68a>] ? kthreadd+0x14c/0x171
    [<ffffffff8023e68a>] ? kthreadd+0x14c/0x171
    [<ffffffff8023e7cc>] ? kthread+0x0/0x74
    [<ffffffff8020bffe>] ? child_rip+0x0/0x12

    Code:  Bad RIP value.
    RIP  [<ffffffff8807b455>]
    RSP <ffff81007dcdde88>
    CR2: ffffffff8807b455
    ---[ end trace c7366c6657fe5bed ]---

Note that this crash happened _after_ firewire-core was unloaded.  The
shared workqueue tried to run firewire-core's device initialization jobs
or similar jobs.

The fix makes sure that firewire-ohci and hence firewire-core is not
unloaded before all device shutdown jobs have been completed.  This is
determined by the count of device initializations minus device releases.

Also skip useless retries in the node initialization job if the node is
to be shut down.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
2008-03-02 12:35:46 +01:00
Stefan Richter 25659f7183 firewire: fw-sbp2: set correct maximum payload (fixes CardBus adapters)
As far as I know, all CardBus FireWire 400 adapters have a maximum
payload of 1024 bytes which is less than the speed-dependent limit of
2048 bytes.  Fw-sbp2 has to take the host adapter's limit into account.

This apparently fixes Juju's incompatibility with my CardBus cards, a
NEC based card and a VIA based card.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Kristian Høgsberg <krh@redhat.com>
2007-08-02 20:34:16 +02:00
Stefan Richter 9c9bdf4d50 firewire: fix memory leak of fw_request instances
Found and debugged by Jay Fenlason <fenlason@redhat.com>.
The bug was especially noticeable with direct I/O over fw-sbp2.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
2007-07-18 23:53:28 +02:00
Stefan Richter 24d40125f1 firewire: optimize gap count with 1394b leaf nodes
Table-based gap count optimization cannot be used if 1394b repeater PHYs
are present.  But it does work with 1394b leaf nodes.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
2007-07-10 00:07:43 +02:00
Stefan Richter 25d83f583b firewire: remove unused macro
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-07-10 00:07:42 +02:00
Kristian Høgsberg 4c5a443e80 firewire: Break out shared IEEE1394 constant to separate header file.
Signed-off-by: Kristian Hoegsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-05-10 18:24:13 +02:00
Kristian Høgsberg a98e271987 firewire: Coding style cleanup: no spaces after function names.
Signed-off-by: Kristian Hoegsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-05-10 18:24:13 +02:00
Kristian Høgsberg c781c06d11 firewire: Clean up comment style.
Drop filenames from file preamble, drop editor annotations and
use standard indent style for block comments.

Signed-off-by: Kristian Hoegsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (fixed typo)
2007-05-10 18:24:13 +02:00
Marc Butler ecab413359 firewire: Add phy register defines.
Signed-off-by: Marc Butler <marc@adaptivecode.com>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (added whitespace)
2007-03-24 23:29:19 +01:00
Kristian Høgsberg eb0306eac0 firewire: Move sync and tag parameters to start_iso ioctl.
Setting these at create_context time or start_iso time doesn't matter
much, but raw1394 sets them at start_iso time so that will be easier to
emulate this way.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-15 18:21:36 +01:00
Kristian Høgsberg d60d7f1d5c firewire: Implement CSR cycle time and bus time registers.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:15 +01:00
Kristian Høgsberg 473d28c730 firewire: Implement topology map and fix a couple of loopback bugs.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:14 +01:00
Kristian Høgsberg f319b6a02f firewire: Move async transmit to use the general context code.
The old async transmit context handling was starting and stopping
DMA for every packet transmission.  This could cause silently failing
packet transmission, if the DMA was reprogrammed too close to being
stopped.

The general context code keeps DMA running at all times and fixes this
problem.  It's also a nice cleanup.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:11 +01:00
Kristian Høgsberg 49e1179b16 firewire: Drop the unused fw_card device.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:06 +01:00
Kristian Høgsberg 937f687969 firewire: Let an fw_descriptor specify a leading immediate key/value pair.
This lets us break out "Juju" as the model name in the config rom.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:05 +01:00
Kristian Høgsberg 98b6cbe83b firewire: Implement sync and tag matching for isochronous receive.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:04 +01:00
Kristian Høgsberg 21efb3cfc6 firewire: Configure channel and speed at context creation time.
We need the channel number as we queue up iso packets for transmission
so we can fill out the header correctly.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:03 +01:00
Kristian Høgsberg d2746dc192 firewire: Use a buffer fill descriptor for receive when header size is 0.
When the DMA is setup to not strip any headers, we need to use
the buffer fill descriptor instead of the dual buffer, since the
dual buffer descriptor must strip a non-zero number of header quadlets.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:01 +01:00
Kristian Høgsberg 9b32d5f307 firewire: Acummulate received iso headers and send them back to user space.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:03:00 +01:00
Kristian Høgsberg b82956685a firewire: Implement functionality to stop isochronous DMA contexts.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:02:59 +01:00
Kristian Høgsberg 69cdb7268c firewire: Rename 'send_iso' to 'start_iso'.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:02:59 +01:00
Kristian Høgsberg 295e3feb92 firewire: Implement basic isochronous receive functionality.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:02:58 +01:00
Kristian Høgsberg 9aad812538 firewire: Split the iso buffer out from fw_iso_context and avoid vmalloc.
This patch splits out the iso buffer so we can initialize it at mmap
time with the size provided in the mmap call.  Furthermore, allocate
the backing pages using alloc_page to avoid setting up kernel side
virtual memory mappings for the pages.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:02:57 +01:00
Kristian Høgsberg 730c32f58b firewire: Implement proper transaction cancelation.
Drivers such as fw-sbp2 had no way to properly cancel in-progress
transactions, which could leave a pending transaction or an unset
packet in the low-level queues after kfree'ing the containing
structure. fw_cancel_transaction() lets drivers cancel a submitted
transaction.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:02:51 +01:00
Kristian Høgsberg 931c4834c8 firewire: Implement compliant bus management.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:02:48 +01:00
Kristian Høgsberg e5f49c3b83 firewire: Sanitize send error codes.
Drop the negative errnos and use RCODEs for all error codes
in the complete transaction callback.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2007-03-09 22:02:47 +01:00