[PATCH 0/3] [PATCH 0/3] dmaengine: polled completion status for out-of-order providers

[Daniel Byrne]

A client that polls transaction status on a device whose work queues
complete out of order, as DSA's do when several engines serve one
queue, cannot use the cookie-ordered dma_async_is_tx_complete(): the
completed-cookie watermark moves past descriptors still in flight.
These three patches add dmaengine_async_is_tx_complete() as the polling
API, routing the query to device_tx_status() without the cookie-window
outputs, implement it in idxd from a generation-numbered cookie that
reads the descriptor's own completion record, and drop
DMA_COMPLETION_NO_ORDER and DMA_OUT_OF_ORDER, whose only setter was
idxd. dmatest's polled mode is the in-tree user; the io_uring DMA copy
offload, to be posted separately, is the one that needs the exact answers.

This applies on top of "dmaengine: idxd: fixes found by an in-kernel
polling client", posted alongside, which the status implementation's
reset-epoch handling depends on.

Daniel Byrne (3):
  dmaengine: add dmaengine_async_is_tx_complete() for channel status
    queries
  dmaengine: idxd: generation-number transaction status
  dmaengine: drop DMA_COMPLETION_NO_ORDER and DMA_OUT_OF_ORDER

 Documentation/driver-api/dmaengine/client.rst |  24 +--
 .../driver-api/dmaengine/provider.rst         |  64 ++++---
 drivers/dma/amba-pl08x.c                      |   2 +-
 drivers/dma/at_hdmac.c                        |   5 +-
 drivers/dma/dmaengine.c                       |   2 +-
 drivers/dma/dmaengine.h                       |  21 ++-
 drivers/dma/dmatest.c                         |  14 +-
 drivers/dma/idxd/device.c                     |   1 +
 drivers/dma/idxd/dma.c                        | 159 +++++++++++++++++-
 drivers/dma/idxd/idxd.h                       |   3 +
 drivers/dma/idxd/irq.c                        |   8 +
 include/linux/dmaengine.h                     |  55 +++---
 12 files changed, 268 insertions(+), 90 deletions(-)


base-commit: c03c1a14507dfaf8b856c2608f9ac216021fc222
prerequisite-patch-id: b50615a6696ce4ffa7e20911f77b9f7f0481f14f
prerequisite-patch-id: 36d833fd556bce04054a7e373ee46575186bb58c
prerequisite-patch-id: 3aeecac097eafb6812e10b9896a242c61c4ca5da
prerequisite-patch-id: 99e0468cdabf56a287c6a7f2d7ef06aa6d5a573e
prerequisite-patch-id: b1dd90551e6b671e751aae8d2a688d9db8f300f5
prerequisite-patch-id: c99a06be81e6a56d84a14bf9e00d2b48455c3a89
prerequisite-patch-id: 3e39b306130b75fedae70a328072dc9577818b9f
prerequisite-patch-id: b1d8fb5b5f7f478adca95f4c8b632480164d18b4
prerequisite-patch-id: b6d48ab83002f113833ba874be299c241788dd30
prerequisite-patch-id: 53bb73bdfd98cd78ca5d86b00ad7e96fcebf7ee6
prerequisite-patch-id: de44e2d44df13e8e07ae00df842d67c9d5c874d2
prerequisite-patch-id: 8191bc0ef2c849d2d9d55f73fc2169f695ea8594
prerequisite-patch-id: bfc55b104522278ca1fba36d3f4adb3a306267bc
prerequisite-patch-id: 12c1f4cba95509b8e7e87ce5c2f9c4265ec0c2df
prerequisite-patch-id: 6e859bfd95e53386bce02ac6585f09a067d0bb8e
prerequisite-patch-id: 2874936c0a5b3863db0309e06ee93008890a714e
prerequisite-patch-id: 85ef17aa68aecd398d3b47ad8df435ce715572e8
-- 
2.43.0