Re: [PATCH RESEND v5 00/24] dmaengine: dw-edma: Add RP/EP local DMA controllers support

Serge Semin
2022-08-24T14:08:10Z

On Tue, Aug 23, 2022 at 09:15:26PM +0530, Manivannan Sadhasivam wrote:
> On Mon, Aug 22, 2022 at 09:53:08PM +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: Done v5] PCI: dwc: Various fixes and cleanups
> > Link: https://lore.kernel.org/linux-pci/20220624143428.8334-1-Sergey.Semin@baikalelectronics.ru/
> > Merged: kernel 6.0-rc1
> > [2: Done v4] PCI: dwc: Add hw version and dma-ranges support
> > Link: https://lore.kernel.org/linux-pci/20220624143947.8991-1-Sergey.Semin@baikalelectronics.ru
> > Merged: kernel 6.0-rc1
> > [3: In-review v5] PCI: dwc: Add generic resources and Baikal-T1 support
> > Link: https://lore.kernel.org/linux-pci/20220822184701.25246-1-Sergey.Semin@baikalelectronics.ru/
> > [4: Done v5] 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/
> >
> > 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.
> >
>

> I've tested this series on Qualcomm SM8450 SoC based dev board. So,
>
> Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
>

Thanks.

> Not sure what is the merging strategy for this one but this series should get
> merged into a single tree. Since the PCI patch is touching the designware
> driver, merging the series into dmaengine tree might result in conflict later.

Right, the series
[PATCH v5 00/20] PCI: dwc: Add generic resources and Baikal-T1 support
is supposed to be merged in first. Then this one will get to be
applied with no conflicts. That's what I imply in the head of the
cover-letter.

-Sergey

>
> Thanks,
> Mani
>
> > 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.
> > - Rebase onto the kernel v5.18.
> >
> > Link: https://lore.kernel.org/linux-pci/20220610091459.17612-1-Sergey.Semin@baikalelectronics.ru
> > Changelog v4:
> > - Rabase onto the laters Frank Li series:
> > Link: https://lore.kernel.org/all/20220524152159.2370739-1-Frank.Li@nxp.com/
> > - Add Vinod' Ab-tag.
> > - Rebase onto the kernel v5.19-rcX.
> >
> > Link: https://lore.kernel.org/linux-pci/20220728142841.12305-1-Sergey.Semin@baikalelectronics.ru
> > Changelog v5:
> > - Just resend.
> > - Rebase onto the kernel v6.0-rc2.
> >
> > Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > Acked-By: Vinod Koul <vkoul@kernel.org>
> > Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> > Cc: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>
> > Cc: "Krzysztof Wilczyński" <kw@linux.com>
> > Cc: linux-pci@vger.kernel.org
> > Cc: dmaengine@vger.kernel.org
> > Cc: linux-kernel@vger.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 | 60 +--
> > 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, 583 insertions(+), 356 deletions(-)
> >
> > --
> > 2.35.1
> >
>
> --
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