linux-kernel - [PATCH v5 0/8] Miscellaneous xdma driver enhancements

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Date: Mon, 18 Dec 2023 12:39:04 +0100
From: Jan Kuliga <jankul@...tek.krakow.pl>
To: lizhi.hou@....com,
	brian.xu@....com,
	raj.kumar.rampelli@....com,
	vkoul@...nel.org,
	michal.simek@....com,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	miquel.raynal@...tlin.com
Cc: jankul@...tek.krakow.pl
Subject: [PATCH v5 0/8] Miscellaneous xdma driver enhancements

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

Changes since v4:
Get rid of duplicated line of code
Fix various coding style issues

[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: Implement interleaved DMA transfers

 drivers/dma/xilinx/xdma-regs.h |  30 ++--
 drivers/dma/xilinx/xdma.c      | 283 +++++++++++++++++++++++----------
 2 files changed, 210 insertions(+), 103 deletions(-)

-- 
2.34.1