linux-kernel - Re: [PATCH v3 00/24] dmaengine: dw-edma: Add RP/EP local DMA controllers support

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Date:   Thu, 21 Jul 2022 17:46:10 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>, Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-pci@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/24] dmaengine: dw-edma: Add RP/EP local DMA
 controllers support

On 10-06-22, 12:14, Serge Semin wrote:
> This is a final patchset in the series created in the framework of
> my Baikal-T1 PCIe/eDMA-related work:
> 
> [1: In-progress v4] PCI: dwc: Various fixes and cleanups
> Link: https://lore.kernel.org/linux-pci/20220610082535.12802-1-Sergey.Semin@baikalelectronics.ru/
> [2: In-progress v3] PCI: dwc: Add hw version and dma-ranges support
> Link: https://lore.kernel.org/linux-pci/20220610084444.14549-1-Sergey.Semin@baikalelectronics.ru/
> [3: In-progress v3] PCI: dwc: Add generic resources and Baikal-T1 support
> Link: https://lore.kernel.org/linux-pci/20220610085706.15741-1-Sergey.Semin@baikalelectronics.ru/
> [4: In-progress v3] dmaengine: dw-edma: Add RP/EP local DMA support
> Link: ---you are looking at it---
> 
> Note it is very recommended to merge the patchsets in the same order as
> they are listed in the set above in order to have them applied smoothly.
> Nothing prevents them from being reviewed synchronously though.
> 
> Please note originally this series was self content, but due to Frank
> being a bit faster in his work submission I had to rebase my patchset onto
> his one. So now this patchset turns to be dependent on the Frank' work:
> 
> Link: https://lore.kernel.org/linux-pci/20220524152159.2370739-1-Frank.Li@nxp.com/
> 
> So please merge Frank' series first before applying this one.
> 
> Here is a short summary regarding this patchset. The series starts with
> fixes patches. We discovered that the dw-edma-pcie.c driver incorrectly
> initializes the LL/DT base addresses for the platforms with not matching
> CPU and PCIe memory spaces. It is fixed by using the pci_bus_address()
> method to get a correct base address. After that you can find a series of
> the interleaved xfers fixes. It turned out the interleaved transfers
> implementation didn't work quite correctly from the very beginning for
> instance missing src/dst addresses initialization, etc. In the framework
> of the next two patches we suggest to add a new platform-specific
> callback - pci_address() and use it to convert the CPU address to the PCIe
> space address. It is at least required for the DW eDMA remote End-point
> setup on the platforms with not-matching CPU/PCIe address spaces. In case
> of the DW eDMA local RP/EP setup the conversion will be done automatically
> by the outbound iATU (if no DMA-bypass flag is specified for the
> corresponding iATU window). Then we introduce a set of the patches to make
> the DebugFS part of the code supporting the multi-eDMA controllers
> platforms. It starts with several cleanup patches and is closed joining
> the Read/Write channels into a single DMA-device as they originally should
> have been. After that you can find the patches with adding the non-atomic
> io-64 methods usage, dropping DT-region descriptors allocation, replacing
> chip IDs with the device name. In addition to that in order to have the
> eDMA embedded into the DW PCIe RP/EP supported we need to bypass the
> dma-ranges-based memory ranges mapping since in case of the root port DT
> node it's applicable for the peripheral PCIe devices only. Finally at the
> series closure we introduce a generic DW eDMA controller support being
> available in the DW PCIe Root Port/Endpoint driver.

Acked-By: Vinod Koul <vkoul@...nel.org>

-- 
~Vinod