linux-toradex.git/drivers/firewire/core-iso.c, branch v3.10.78 Linux kernel for Apalis and Colibri modules firewire: core: fix multichannel IR with buffers larger than 2 GB 2012-06-17T17:35:26+00:00 Clemens Ladisch clemens@ladisch.de 2012-06-13T20:28:24+00:00 9d23f9e946ad757344792a20ba5152f3a921688b With a 32-bit i, computing i<<PAGE_SHIFT might result in an overflow and in an eventual sign-extension. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> 
With a 32-bit i, computing i<<PAGE_SHIFT might result in
an overflow and in an eventual sign-extension.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
firewire: core: fix DMA mapping direction 2012-04-17T20:27:37+00:00 Stefan Richter stefanr@s5r6.in-berlin.de 2012-04-09T18:51:18+00:00 0b6c4857f7684f6d3f59e0506f62953575346978 Seen with recent libdc1394: If a client mmap()s the buffer of an isochronous reception buffer with PROT_READ|PROT_WRITE instead of just PROT_READ, firewire-core sets the wrong DMA mapping direction during buffer initialization. The fix is to split fw_iso_buffer_init() into allocation and DMA mapping and to perform the latter after both buffer and DMA context were allocated. Buffer allocation and context allocation may happen in any order, but we need the context type (reception or transmission) in order to set the DMA direction of the buffer. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> 
Seen with recent libdc1394:  If a client mmap()s the buffer of an
isochronous reception buffer with PROT_READ|PROT_WRITE instead of just
PROT_READ, firewire-core sets the wrong DMA mapping direction during
buffer initialization.

The fix is to split fw_iso_buffer_init() into allocation and DMA mapping
and to perform the latter after both buffer and DMA context were
allocated.  Buffer allocation and context allocation may happen in any
order, but we need the context type (reception or transmission) in order
to set the DMA direction of the buffer.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Merge tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 2012-03-23T03:31:15+00:00 Linus Torvalds torvalds@linux-foundation.org 2012-03-23T03:31:15+00:00 34699403e9916060af8ae23f5e4705a6c078e79d Pull IEEE 1394 (FireWire) subsystem updates post v3.3 from Stefan Richter: - Some SBP-2 initiator fixes, side product from ongoing work on a target. - Reintroduction of an isochronous I/O feature of the older ieee1394 driver stack (flush buffer completions); it was evidently rarely used but not actually unused. Matching libraw1394 code is already available. - Be sure to prefix all kernel log messages with device name or card name, and other logging related cleanups. - Misc other small cleanups, among them a small API change that affects sound/firewire/ too. Clemens Ladisch is aware of it. * tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: (26 commits) firewire: allow explicit flushing of iso packet completions firewire: prevent dropping of completed iso packet header data firewire: ohci: factor out iso completion flushing code firewire: ohci: simplify iso header pointer arithmetic firewire: ohci: optimize control bit checks firewire: ohci: remove unused excess_bytes field firewire: ohci: copy_iso_headers(): make comment match the code firewire: cdev: fix IR multichannel event documentation firewire: ohci: fix too-early completion of IR multichannel buffers firewire: ohci: move runtime debug facility out of #ifdef firewire: tone down some diagnostic log messages firewire: sbp2: replace a GFP_ATOMIC allocation firewire: sbp2: Fix SCSI sense data mangling firewire: sbp2: Ignore SBP-2 targets on the local node firewire: sbp2: Take into account Unit_Unique_ID firewire: nosy: Use the macro DMA_BIT_MASK(). firewire: core: convert AR-req handler lock from _irqsave to _bh firewire: core: fix race at address_handler unregistration firewire: core: remove obsolete comment firewire: core: prefix log messages with card name ... 
Pull IEEE 1394 (FireWire) subsystem updates post v3.3 from Stefan Richter:

 - Some SBP-2 initiator fixes, side product from ongoing work on a target.

 - Reintroduction of an isochronous I/O feature of the older ieee1394 driver
   stack (flush buffer completions); it was evidently rarely used but not
   actually unused.  Matching libraw1394 code is already available.

 - Be sure to prefix all kernel log messages with device name or card name,
   and other logging related cleanups.

 - Misc other small cleanups, among them a small API change that affects
   sound/firewire/ too. Clemens Ladisch is aware of it.

* tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: (26 commits)
  firewire: allow explicit flushing of iso packet completions
  firewire: prevent dropping of completed iso packet header data
  firewire: ohci: factor out iso completion flushing code
  firewire: ohci: simplify iso header pointer arithmetic
  firewire: ohci: optimize control bit checks
  firewire: ohci: remove unused excess_bytes field
  firewire: ohci: copy_iso_headers(): make comment match the code
  firewire: cdev: fix IR multichannel event documentation
  firewire: ohci: fix too-early completion of IR multichannel buffers
  firewire: ohci: move runtime debug facility out of #ifdef
  firewire: tone down some diagnostic log messages
  firewire: sbp2: replace a GFP_ATOMIC allocation
  firewire: sbp2: Fix SCSI sense data mangling
  firewire: sbp2: Ignore SBP-2 targets on the local node
  firewire: sbp2: Take into account Unit_Unique_ID
  firewire: nosy: Use the macro DMA_BIT_MASK().
  firewire: core: convert AR-req handler lock from _irqsave to _bh
  firewire: core: fix race at address_handler unregistration
  firewire: core: remove obsolete comment
  firewire: core: prefix log messages with card name
  ...
firewire: allow explicit flushing of iso packet completions 2012-03-18T21:15:39+00:00 Clemens Ladisch clemens@ladisch.de 2012-03-18T18:06:39+00:00 d1bbd20972936b9b178fda3eb1ec417cb27fdc01 Extend the kernel and userspace APIs to allow reporting all currently completed isochronous packets, even if the next interrupt packet has not yet been reached. This is required to determine the status of the packets at the end of a paused or stopped stream, and useful for more precise synchronization of audio streams. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> 
Extend the kernel and userspace APIs to allow reporting all currently
completed isochronous packets, even if the next interrupt packet has not
yet been reached.  This is required to determine the status of the
packets at the end of a paused or stopped stream, and useful for more
precise synchronization of audio streams.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
drivers/firewire: Add export.h for EXPORT_SYMBOL to core-iso.c 2011-10-31T23:31:46+00:00 Paul Gortmaker paul.gortmaker@windriver.com 2011-07-10T16:16:32+00:00 823467e5fc0c8566a93cfca0e40df6d5de6a4bc3 Ensure that the EXPORT_SYMBOL macros are present for when we clean up the "module.h" is everywhere situation, to prevent build failures. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> 
Ensure that the EXPORT_SYMBOL macros are present for when we clean up
the "module.h" is everywhere situation, to prevent build failures.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
firewire: optimize iso queueing by setting wake only after the last packet 2011-05-10T20:53:45+00:00 Clemens Ladisch clemens@ladisch.de 2011-05-02T07:33:56+00:00 13882a82ee1646336c3996c93b4a560a55d2a419 When queueing iso packets, the run time is dominated by the two MMIO accesses that set the DMA context's wake bit. Because most drivers submit packets in batches, we can save much time by removing all but the last wakeup. The internal kernel API is changed to require a call to fw_iso_context_queue_flush() after a batch of queued packets. The user space API does not change, so one call to FW_CDEV_IOC_QUEUE_ISO must specify multiple packets to take advantage of this optimization. In my measurements, this patch reduces the time needed to queue fifty skip packets from userspace to one sixth on a 2.5 GHz CPU, or to one third at 800 MHz. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> 
When queueing iso packets, the run time is dominated by the two
MMIO accesses that set the DMA context's wake bit.  Because most
drivers submit packets in batches, we can save much time by
removing all but the last wakeup.

The internal kernel API is changed to require a call to
fw_iso_context_queue_flush() after a batch of queued packets.
The user space API does not change, so one call to
FW_CDEV_IOC_QUEUE_ISO must specify multiple packets to take
advantage of this optimization.

In my measurements, this patch reduces the time needed to queue
fifty skip packets from userspace to one sixth on a 2.5 GHz CPU,
or to one third at 800 MHz.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
firewire: octlet AT payloads can be stack-allocated 2011-05-10T20:53:44+00:00 Stefan Richter stefanr@s5r6.in-berlin.de 2011-04-22T13:13:54+00:00 f30e6d3e419bfb5540fa82ba7eca01d578556e6b We do not need slab allocations anymore in order to satisfy streaming DMA mapping constraints, thanks to commit da28947e7e36 "firewire: ohci: avoid separate DMA mapping for small AT payloads". (Besides, the slab-allocated buffers that firewire-core, firewire-sbp2, and firedtv used to provide for 8-byte write and lock requests were still not fully portable since they crossed cacheline boundaries or shared a cacheline with unrelated CPU-accessed data. snd-firewire-lib got this aspect right by using an extra kmalloc/ kfree just for the 8-byte transaction buffer.) This change replaces kmalloc'ed lock transaction scratch buffers in firewire-core, firedtv, and snd-firewire-lib by local stack allocations. Perhaps the most notable result of the change is simpler locking because there is no need to serialize usages of preallocated per-device buffers anymore. Also, allocations and deallocations are simpler. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Acked-by: Clemens Ladisch <clemens@ladisch.de> 
We do not need slab allocations anymore in order to satisfy
streaming DMA mapping constraints, thanks to commit da28947e7e36
"firewire: ohci: avoid separate DMA mapping for small AT payloads".

(Besides, the slab-allocated buffers that firewire-core, firewire-sbp2,
and firedtv used to provide for 8-byte write and lock requests were
still not fully portable since they crossed cacheline boundaries or
shared a cacheline with unrelated CPU-accessed data.  snd-firewire-lib
got this aspect right by using an extra kmalloc/ kfree just for the
8-byte transaction buffer.)

This change replaces kmalloc'ed lock transaction scratch buffers in
firewire-core, firedtv, and snd-firewire-lib by local stack allocations.
Perhaps the most notable result of the change is simpler locking because
there is no need to serialize usages of preallocated per-device buffers
anymore.  Also, allocations and deallocations are simpler.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2011-03-21T17:05:22+00:00 Linus Torvalds torvalds@linux-foundation.org 2011-03-21T17:05:22+00:00 c3ca48f062a37c2f79560a9b0b9f1b08039aa248 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: firewire: core: ignore link-active bit of new nodes, fix device recognition firewire: sbp2: revert obsolete 'fix stall with "Unsolicited response"' firewire: core: increase default SPLIT_TIMEOUT value firewire: ohci: Misleading kfree in ohci.c::pci_probe/remove firewire: ohci: omit IntEvent.busReset check rom AT queueing firewire: ohci: prevent starting of iso contexts with empty queue firewire: ohci: prevent iso completion callbacks after context stop firewire: core: rename some variables firewire: nosy: should work on Power Mac G4 PCI too firewire: core: fix card->reset_jiffies overflow firewire: cdev: remove unneeded reference firewire: cdev: always wait for outbound transactions to complete firewire: cdev: remove unneeded idr_find() from complete_transaction() firewire: ohci: log dead DMA contexts 
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: core: ignore link-active bit of new nodes, fix device recognition
  firewire: sbp2: revert obsolete 'fix stall with "Unsolicited response"'
  firewire: core: increase default SPLIT_TIMEOUT value
  firewire: ohci: Misleading kfree in ohci.c::pci_probe/remove
  firewire: ohci: omit IntEvent.busReset check rom AT queueing
  firewire: ohci: prevent starting of iso contexts with empty queue
  firewire: ohci: prevent iso completion callbacks after context stop
  firewire: core: rename some variables
  firewire: nosy: should work on Power Mac G4 PCI too
  firewire: core: fix card->reset_jiffies overflow
  firewire: cdev: remove unneeded reference
  firewire: cdev: always wait for outbound transactions to complete
  firewire: cdev: remove unneeded idr_find() from complete_transaction()
  firewire: ohci: log dead DMA contexts
ALSA: add LaCie FireWire Speakers/Griffin FireWave Surround driver 2011-03-15T07:42:22+00:00 Clemens Ladisch clemens@ladisch.de 2011-03-15T06:53:21+00:00 31ef9134eb52636d383a7d0626cbbd345cb94f2f Add a driver for two playback-only FireWire devices based on the OXFW970 chip. v2: better AMDTP API abstraction; fix fw_unit leak; small fixes v3: cache the iPCR value v4: FireWave constraints; fix fw_device reference counting; fix PCR caching; small changes and fixes v5: volume/mute support; fix crashing due to pcm stop races v6: fix build; one-channel volume for LaCie v7: use signed values to make volume (range checks) work; fix function block IDs for volume/mute; always use channel 0 for LaCie volume Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Tested-by: Jay Fenlason <fenlason@redhat.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> 
Add a driver for two playback-only FireWire devices based on the OXFW970
chip.

v2: better AMDTP API abstraction; fix fw_unit leak; small fixes
v3: cache the iPCR value
v4: FireWave constraints; fix fw_device reference counting;
    fix PCR caching; small changes and fixes
v5: volume/mute support; fix crashing due to pcm stop races
v6: fix build; one-channel volume for LaCie
v7: use signed values to make volume (range checks) work; fix function
    block IDs for volume/mute; always use channel 0 for LaCie volume

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
firewire: core: rename some variables 2011-02-26T14:11:03+00:00 Clemens Ladisch clemens@ladisch.de 2011-01-31T10:58:58+00:00 5aaffc65a27dd9db65455c2c9ab3ede57238d2f5 In manage_channel(), rename the variables "c" and "i" to the more expressive "bit" and "channel". Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> 
In manage_channel(), rename the variables "c" and "i" to the more
expressive "bit" and "channel".

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>