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[v2,00/26] dmaengine: dw-edma: Add RP/EP local DMA controllers support

Message ID 20220503225104.12108-1-Sergey.Semin@baikalelectronics.ru (mailing list archive)
Headers show
Series dmaengine: dw-edma: Add RP/EP local DMA controllers support | expand

Message

Serge Semin May 3, 2022, 10:50 p.m. UTC
This is a final patchset in the series created in the framework of
my Baikal-T1 PCIe/eDMA-related work:

[1: In-progress v3] clk: Baikal-T1 DDR/PCIe resets and some xGMAC fixes
Link: https://lore.kernel.org/linux-pci/20220503205722.24755-1-Sergey.Semin@baikalelectronics.ru/
[2: In-progress v2] PCI: dwc: Various fixes and cleanups
Link: https://lore.kernel.org/linux-pci/20220503212300.30105-1-Sergey.Semin@baikalelectronics.ru/
[3: In-progress v2] PCI: dwc: Add dma-ranges/YAML-schema/Baikal-T1 support
Link: https://lore.kernel.org/linux-pci/20220503214638.1895-1-Sergey.Semin@baikalelectronics.ru/
[4: In-progress v2] dmaengine: dw-edma: Add RP/EP local DMA controllers support
Link: --you are looking at it--

Note it is recommended to merge this patchset after the former ones in
order to prevent merge conflicts. @Lorenzo could you merge in this
patchset through your PCIe repo? After getting all the ack'es of course
and after merging in the @Frank' series? (See the next paragraph for more
details.)

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/20220503005801.1714345-1-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. The very first patch fixes the dma_direct_map_resource()
method, which turned out to be not working correctly for the case of
having devive.dma_range_map being non-empty (non-empty dma-ranges DT
property). Then 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 Host/End-point 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.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>
Cc: Rob Herring <robh@kernel.org>
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 (26):
  dma-direct: take dma-ranges/offsets into account in resource mapping
  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 generic iATU/eDMA CSRs space detection method
  PCI: dwc: Add DW eDMA engine support

 drivers/dma/dw-edma/dw-edma-core.c            | 211 +++++-----
 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   |  16 +-
 .../pci/controller/dwc/pcie-designware-host.c |  17 +-
 drivers/pci/controller/dwc/pcie-designware.c  | 251 ++++++++++--
 drivers/pci/controller/dwc/pcie-designware.h  |  23 +-
 include/linux/dma/edma.h                      |  18 +-
 include/linux/dmaengine.h                     |   2 +-
 kernel/dma/direct.c                           |   2 +-
 14 files changed, 628 insertions(+), 400 deletions(-)

Comments

Manivannan Sadhasivam May 12, 2022, 2:11 p.m. UTC | #1
On Wed, May 04, 2022 at 01:50:38AM +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 v3] clk: Baikal-T1 DDR/PCIe resets and some xGMAC fixes
> Link: https://lore.kernel.org/linux-pci/20220503205722.24755-1-Sergey.Semin@baikalelectronics.ru/
> [2: In-progress v2] PCI: dwc: Various fixes and cleanups
> Link: https://lore.kernel.org/linux-pci/20220503212300.30105-1-Sergey.Semin@baikalelectronics.ru/
> [3: In-progress v2] PCI: dwc: Add dma-ranges/YAML-schema/Baikal-T1 support
> Link: https://lore.kernel.org/linux-pci/20220503214638.1895-1-Sergey.Semin@baikalelectronics.ru/
> [4: In-progress v2] dmaengine: dw-edma: Add RP/EP local DMA controllers support
> Link: --you are looking at it--
> 

I rebased my Qcom specific changes on top of the above patches and tested
on SM8450 based dev board. After fixing couple of issues (shared those in the
respective patch postings), everything seems to work fine.

So feel free to add my Tested-by tag for dwc/edma patches after fixing those
issues.

Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Thanks,
Mani

> Note it is recommended to merge this patchset after the former ones in
> order to prevent merge conflicts. @Lorenzo could you merge in this
> patchset through your PCIe repo? After getting all the ack'es of course
> and after merging in the @Frank' series? (See the next paragraph for more
> details.)
> 
> 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/20220503005801.1714345-1-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. The very first patch fixes the dma_direct_map_resource()
> method, which turned out to be not working correctly for the case of
> having devive.dma_range_map being non-empty (non-empty dma-ranges DT
> property). Then 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 Host/End-point 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.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> Cc: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>
> Cc: Rob Herring <robh@kernel.org>
> 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 (26):
>   dma-direct: take dma-ranges/offsets into account in resource mapping
>   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 generic iATU/eDMA CSRs space detection method
>   PCI: dwc: Add DW eDMA engine support
> 
>  drivers/dma/dw-edma/dw-edma-core.c            | 211 +++++-----
>  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   |  16 +-
>  .../pci/controller/dwc/pcie-designware-host.c |  17 +-
>  drivers/pci/controller/dwc/pcie-designware.c  | 251 ++++++++++--
>  drivers/pci/controller/dwc/pcie-designware.h  |  23 +-
>  include/linux/dma/edma.h                      |  18 +-
>  include/linux/dmaengine.h                     |   2 +-
>  kernel/dma/direct.c                           |   2 +-
>  14 files changed, 628 insertions(+), 400 deletions(-)
> 
> -- 
> 2.35.1
>