[PATCH v4 0/8] Miscellaneous xdma driver enhancements

Jan Kuliga
2023-12-08T13:48:55Z

Hi,

This patchset introduces a couple of xdma driver enhancements. The most
important change is the introduction of interleaved DMA transfers
feature, which is a big deal, as it allows DMAEngine clients to express
DMA transfers in an arbitrary way. This is extremely useful in FPGA
environments, where in one FPGA system there may be a need to do DMA both
to/from FIFO at a fixed address and to/from a (non)contiguous RAM.

It is a another reroll of my previous patch series [1], but it is heavily
modified one as it is based on Miquel's patchset [2]. We agreed on doing
it that way, as both our patchsets touched the very same piece of code.
The discussion took place under [2] thread.

I tested it with XDMA v4.1 (Rev.20) IP core, with both sg and
interleaved DMA transfers.

Jan

Changes since v1:
[PATCH 1/5]:
Complete a terminated descriptor with dma_cookie_complete()
Don't reinitialize temporary list head in xdma_terminate_all()
[PATCH 4/5]:
Fix incorrect text wrapping

Changes since v2:
[PATCH 1/5]:
DO NOT schedule callback from within xdma_terminate_all()

Changes since v3:
Base patchset on Miquel's [2] series
Reorganize commits` structure
Introduce interleaved DMA transfers feature
Implement transfer error reporting

[1]:
https://lore.kernel.org/dmaengine/20231124192524.134989-1-jankul@alatek.krakow.pl/T/#t

[2]:
https://lore.kernel.org/dmaengine/20231130111315.729430-1-miquel.raynal@bootlin.com/T/#t

---
Jan Kuliga (8):
dmaengine: xilinx: xdma: Get rid of unused code
dmaengine: xilinx: xdma: Add necessary macro definitions
dmaengine: xilinx: xdma: Ease dma_pool alignment requirements
dmaengine: xilinx: xdma: Rework xdma_terminate_all()
dmaengine: xilinx: xdma: Add error checking in xdma_channel_isr()
dmaengine: xilinx: xdma: Add transfer error reporting
dmaengine: xilinx: xdma: Prepare the introduction of interleaved DMA
transfers
dmaengine: xilinx: xdma: Introduce interleaved DMA transfers

drivers/dma/xilinx/xdma-regs.h | 30 ++--
drivers/dma/xilinx/xdma.c | 285 ++++++++++++++++++++++-----------
2 files changed, 210 insertions(+), 105 deletions(-)

--
2.34.1