Re: [PATCH 0/2] firewire: core: allow unit drivers to schedule work item to process isochronous con
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From: Takashi S. <o-t...@sa...> - 2024-09-09 00:22:44
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On Sun, Sep 08, 2024 at 01:05:47PM +0900, Takashi Sakamoto wrote: > Hi, > > ALSA firewire stack uses packet-per-buffer mode for both isochronous > receive (IR) and transmit (IT) contexts of 1394 OHCI. To process time > stamp per packet (or per sample in some cases) steadily for media clock > recovery against unexpected transmission skips in the IR context, it uses > an IT context to operate all of isochronous contexts by calls of > fw_iso_context_flush_completions() in the bottom-half of hardIRQ for the > IT context. > > Although it looks well to handle all of isochronous contexts in a single > bottom-half context, it relatively takes longer time to finish. In the > future code integration (not yet), it is possible to apply parallelism > method to process these context. In the case, it is useful to allow unit > drivers to schedule work items to process these isochronous contexts. > > As a preparation, in this series of changes, > fw_iso_context_schedule_flush_completions() is exposed as a kernel API > available by unit drivers. It is a counter part of > fw_iso_context_flush_completions(). This series of changes also includes > documentation about these kernel APIs. > > Takashi Sakamoto (2): > firewire: core: expose kernel API to schedule work item to process > isochronous context > firewire: core: fulfill documentation of > fw_iso_context_flush_completions() > > Documentation/driver-api/firewire.rst | 2 ++ > drivers/firewire/core-iso.c | 11 +++++++++++ > drivers/firewire/core.h | 5 ----- > drivers/firewire/ohci.c | 4 ++-- > include/linux/firewire.h | 17 +++++++++++++++++ > 5 files changed, 32 insertions(+), 7 deletions(-) Applied to for-next branch. Regards Takashi Sakamoto |