Message-ID: <20220711153901.y6gjwstyuarcvjoj@mobilestation>
Date:   Mon, 11 Jul 2022 18:39:01 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>, 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>,
        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 Mon, Jul 11, 2022 at 08:19:03PM +0530, Manivannan Sadhasivam wrote:
> On Mon, Jul 11, 2022 at 08:15:41PM +0530, Manivannan Sadhasivam wrote:
> > On Fri, Jun 10, 2022 at 12:21:33PM +0300, Serge Semin wrote:
> > > On Fri, Jun 10, 2022 at 12:14:35PM +0300, 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.
> > > > 
> > > > Link: https://lore.kernel.org/linux-pci/20220324014836.19149-1-Sergey.Semin@baikalelectronics.ru/
> > > > Changelog v2:
> > > > - Drop the patches:
> > > >   [PATCH 1/25] dmaengine: dw-edma: Drop dma_slave_config.direction field usage
> > > >   [PATCH 2/25] dmaengine: dw-edma: Fix eDMA Rd/Wr-channels and DMA-direction semantics
> > > >   since they are going to be merged in in the framework of the
> > > >   Frank's patchset.
> > > > - Add a new patch: "dmaengine: dw-edma: Release requested IRQs on
> > > >   failure."
> > > > - Drop __iomem qualifier from the struct dw_edma_debugfs_entry instance
> > > >   definition in the dw_edma_debugfs_u32_get() method. (@Manivannan)
> > > > - Add a new patch: "dmaengine: dw-edma: Rename DebugFS dentry variables to
> > > >   'dent'." (@Manivannan)
> > > > - Slightly extend the eDMA name array size. (@Manivannan)
> > > > - Change the specific DMA mapping comment a bit to being
> > > >   clearer. (@Manivannan)
> > > > - Add a new patch: "PCI: dwc: Add generic iATU/eDMA CSRs space detection
> > > >   method."
> > > > - Don't fail eDMA detection procedure if the DW eDMA driver couldn't probe
> > > >   device. That happens if the driver is disabled. (@Manivannan)
> > > > - Add "dma" registers resource mapping procedure. (@Manivannan)
> > > > - Move the eDMA CSRs space detection into the dw_pcie_map_detect() method.
> > > > - Remove eDMA on the dw_pcie_ep_init() internal errors. (@Manivannan)
> > > > - Remove eDMA in the dw_pcie_ep_exit() method.
> > > > - Move the dw_pcie_edma_detect() method execution to the tail of the
> > > >   dw_pcie_ep_init() function.
> > > > 
> > > > Link: https://lore.kernel.org/linux-pci/20220503225104.12108-1-Sergey.Semin@baikalelectronics.ru/
> > > > Changelog v3:
> > > 
> > > > - Conditionally set dchan->dev->device.dma_coherent field since it can
> > > >   be missing on some platforms. (@Manivannan)
> > > > - Drop the patch: "PCI: dwc: Add generic iATU/eDMA CSRs space detection
> > > >   method". A similar modification has been done in another patchset.
> > > > - Add more comprehensive and less regression prune eDMA block detection
> > > >   procedure.
> > > > - Drop the patch: "dma-direct: take dma-ranges/offsets into account in
> > > >   resource mapping". It will be separately reviewed.
> > > > - Remove Manivannan tb tag from the modified patches.
> > > 
> > > @Mani, several patches have been changed. Could you have a look at the
> > > series one more time?
> > > 
> > 

> > Reviewed all patches in this series. I believe this will still work on my
> > hardware once I test it. But even if it doesn't work, we can fix it in
> > 5.20-rc's as it supposed to be. So definitely not a show stopper.

Hi Mani. Thanks for review. I'll make sure your tag will persist in
the patch logs.

> > 

> > Vinod: Could you please merge this one for 5.20?
> > 
> 
> Hmm, maybe this can go through pci tree as Bjorn merged earlier edma series as
> well. In that case Vinod's ack is sufficient.

As I said in the cover letter this series depends on the three more
patchsets:
[1: Done v4] PCI: dwc: Various fixes and cleanups
Link: https://lore.kernel.org/linux-pci/20220610082535.12802-1-Sergey.Semin@baikalelectronics.ru/
Link: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/log/?h=pci/ctrl/dwc-fixes
[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/ 

So at the very least they must be merged in first before this series
gets into the kernel. #1 is already in Bjorn' repo. #2 is still on
review, but no comments have been sent in v3. So it can be merged in
as is. I desperately need Rob' feedback on my questions in order to
re-submit #3. But it's not that easy to achieve at this moment first
due to him being on vacation then him being very busy with other
patches review.( So until series #3' review is done, this patchset
will have to stay in limbo. Anyway I hope we'll settle all the issues
with Rob soon.

-Sergey

> 
> But I'll leave it up to Bjorn and Vinod.
> 
> Thanks,
> Mani
> 
> > Thanks,
> > Mani
> > 
> > > -Sergey
> > > 
> > > > - Rebase onto the kernel v5.18.
> > > > 
> > > > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > > > Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> > > > Cc: Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>
> > > > Cc: "Krzysztof Wilczyński" <kw@...ux.com>
> > > > Cc: linux-pci@...r.kernel.org
> > > > Cc: dmaengine@...r.kernel.org
> > > > Cc: linux-kernel@...r.kernel.org
> > > > 
> > > > Serge Semin (24):
> > > >   dmaengine: Fix dma_slave_config.dst_addr description
> > > >   dmaengine: dw-edma: Release requested IRQs on failure
> > > >   dmaengine: dw-edma: Convert ll/dt phys-address to PCIe bus/DMA address
> > > >   dmaengine: dw-edma: Fix missing src/dst address of the interleaved
> > > >     xfers
> > > >   dmaengine: dw-edma: Don't permit non-inc interleaved xfers
> > > >   dmaengine: dw-edma: Fix invalid interleaved xfers semantics
> > > >   dmaengine: dw-edma: Add CPU to PCIe bus address translation
> > > >   dmaengine: dw-edma: Add PCIe bus address getter to the remote EP
> > > >     glue-driver
> > > >   dmaengine: dw-edma: Drop chancnt initialization
> > > >   dmaengine: dw-edma: Fix DebugFS reg entry type
> > > >   dmaengine: dw-edma: Stop checking debugfs_create_*() return value
> > > >   dmaengine: dw-edma: Add dw_edma prefix to the DebugFS nodes descriptor
> > > >   dmaengine: dw-edma: Convert DebugFS descs to being kz-allocated
> > > >   dmaengine: dw-edma: Rename DebugFS dentry variables to 'dent'
> > > >   dmaengine: dw-edma: Simplify the DebugFS context CSRs init procedure
> > > >   dmaengine: dw-edma: Move eDMA data pointer to DebugFS node descriptor
> > > >   dmaengine: dw-edma: Join Write/Read channels into a single device
> > > >   dmaengine: dw-edma: Use DMA-engine device DebugFS subdirectory
> > > >   dmaengine: dw-edma: Use non-atomic io-64 methods
> > > >   dmaengine: dw-edma: Drop DT-region allocation
> > > >   dmaengine: dw-edma: Replace chip ID number with device name
> > > >   dmaengine: dw-edma: Bypass dma-ranges mapping for the local setup
> > > >   dmaengine: dw-edma: Skip cleanup procedure if no private data found
> > > >   PCI: dwc: Add DW eDMA engine support
> > > > 
> > > >  drivers/dma/dw-edma/dw-edma-core.c            | 216 +++++-----
> > > >  drivers/dma/dw-edma/dw-edma-core.h            |  10 +-
> > > >  drivers/dma/dw-edma/dw-edma-pcie.c            |  24 +-
> > > >  drivers/dma/dw-edma/dw-edma-v0-core.c         |  76 ++--
> > > >  drivers/dma/dw-edma/dw-edma-v0-core.h         |   1 -
> > > >  drivers/dma/dw-edma/dw-edma-v0-debugfs.c      | 372 ++++++++----------
> > > >  drivers/dma/dw-edma/dw-edma-v0-debugfs.h      |   5 -
> > > >  .../pci/controller/dwc/pcie-designware-ep.c   |  12 +-
> > > >  .../pci/controller/dwc/pcie-designware-host.c |  13 +-
> > > >  drivers/pci/controller/dwc/pcie-designware.c  | 186 +++++++++
> > > >  drivers/pci/controller/dwc/pcie-designware.h  |  20 +
> > > >  include/linux/dma/edma.h                      |  18 +-
> > > >  include/linux/dmaengine.h                     |   2 +-
> > > >  13 files changed, 589 insertions(+), 366 deletions(-)
> > > > 
> > > > -- 
> > > > 2.35.1
> > > > 
> > 
> > -- 
> > மணிவண்ணன் சதாசிவம்
> 
> -- 
> மணிவண்ணன் சதாசிவம்

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