[PATCH v9 00/27] dmaengine: dw-edma: Add RP/EP local DMA controllers support

Serge Semin
2023-01-13T17:23:02Z

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: Done v7] PCI: dwc: Add generic resources and Baikal-T1 support
Link: https://lore.kernel.org/linux-pci/20221113191301.5526-1-Sergey.Semin@baikalelectronics.ru/
Merged: kernel 6.2-rc1
[4: In-review v9] dmaengine: dw-edma: Add RP/EP local DMA controllers 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.
Since the patchsets 1-3 have already been merged into the mainline kernel
this series can be applied via any DMA-engine or PCI repos.

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.
- 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.

Link: https://lore.kernel.org/linux-pci/20220822185332.26149-1-Sergey.Semin@baikalelectronics.ru
Changelog v6:
- Fix some patchlog and in-line comments misspells. (@Bjorn)
- Directly call *_dma_configure() method on the DW eDMA channel child
device used for the DMA buffers mapping. (@Robin)
- Explicitly set the DMA-mask of the child device in the channel
allocation proecedure. (@Robin)
- Rebase onto the kernel v6.1-rc3.

Link: https://lore.kernel.org/linux-pci/20221107210438.1515-1-Sergey.Semin@baikalelectronics.ru/
Changelog v7:
- Activate the mapping auto-detection procedure for IP-cores older than
5.40a. The viewport-based access has been removed since that
version. (@Yoshihiro)
- Drop the patch
[PATCH v6 22/24] dmaengine: dw-edma: Bypass dma-ranges mapping for the local setup
since the problem has been fixed in the commit f1ad5338a4d5 ("of: Fix
"dma-ranges" handling for bus controllers"). (@Robin)
- Add a new patch:
[PATCH v7 23/25] PCI: dwc: Restore DMA-mask after MSI-data allocation
(@Robin)
- Add a new patch:
[PATCH v7 24/25] PCI: bt1: Set 64-bit DMA-mask
(@Robin)

Link: https://lore.kernel.org/linux-pci/20221214235305.31744-1-Sergey.Semin@baikalelectronics.ru/
Changelog v8:
- Add a new patch:
[PATCH v8 23/26] dmaengine: dw-edma: Relax driver config settings
(@tbot)
- Replace the patch
[PATCH v7 23/25] PCI: dwc: Restore DMA-mask after MSI-data allocation
with a new one:
[PATCH v8 24/26] PCI: dwc: Set coherent DMA-mask on MSI-address allocation
(@Robin, @Christoph)

Link: https://lore.kernel.org/linux-pci/20221219144658.26620-1-Sergey.Semin@baikalelectronics.ru/
Changelog v9:
- Add a new patch:
[PATCH v9 23/27] dmaengine: dw-edma: Add mem-mapped LL-entries support
(@tbot)
- Rebase onto the kernel 6.2-rc3.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>
Cc: "Krzysztof Wilczyński" <kw@linux.com>
Cc: caihuoqing <caihuoqing@baidu.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: linux-pci@vger.kernel.org
Cc: dmaengine@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

Serge Semin (27):
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: Skip cleanup procedure if no private data found
dmaengine: dw-edma: Add mem-mapped LL-entries support
dmaengine: dw-edma: Relax driver config settings
PCI: dwc: Set coherent DMA-mask on MSI-address allocation
PCI: bt1: Set 64-bit DMA-mask
PCI: dwc: Add DW eDMA engine support

drivers/dma/dw-edma/Kconfig | 5 +-
drivers/dma/dw-edma/dw-edma-core.c | 196 ++++-----
drivers/dma/dw-edma/dw-edma-core.h | 10 +-
drivers/dma/dw-edma/dw-edma-pcie.c | 56 ++-
drivers/dma/dw-edma/dw-edma-v0-core.c | 121 +++---
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 -
drivers/pci/controller/dwc/pcie-bt1.c | 4 +
.../pci/controller/dwc/pcie-designware-ep.c | 12 +-
.../pci/controller/dwc/pcie-designware-host.c | 24 +-
drivers/pci/controller/dwc/pcie-designware.c | 195 +++++++++
drivers/pci/controller/dwc/pcie-designware.h | 21 +
include/linux/dma/edma.h | 25 +-
include/linux/dmaengine.h | 2 +-
15 files changed, 652 insertions(+), 397 deletions(-)

--
2.39.0