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Message-ID: <20220616200316.GA1106102@bhelgaas>
Date: Thu, 16 Jun 2022 15:03:16 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc: Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Serge Semin <fancer.lancer@...il.com>,
Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
Jingoo Han <jingoohan1@...il.com>,
Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
Krzysztof Wilczyński <kw@...ux.com>,
Frank Li <Frank.Li@....com>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 00/18] PCI: dwc: Various fixes and cleanups
On Fri, Jun 10, 2022 at 11:25:16AM +0300, Serge Semin wrote:
> This patchset is a first one 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: ---you are looking at it---
> [2: In-progress v2] PCI: dwc: Add hw version and dma-ranges support
> Link: https://lore.kernel.org/linux-pci/20220503214638.1895-1-Sergey.Semin@baikalelectronics.ru/
> [3: In-progress v2] PCI: dwc: Add extended YAML-schema and 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 support
> Link: https://lore.kernel.org/linux-pci/20220503225104.12108-1-Sergey.Semin@baikalelectronics.ru/
>
> Note it is very recommended to merge the patchsets in the same order as
> they are placed in the list above in order to prevent possible merge
> conflicts. Nothing prevents them from being reviewed synchronously though.
> Any tests are very welcome!
>
> As it can be easily inferred from the patchset title, this series is about
> the DW PCIe Root Port/Endpoint driver fixes and the code cleanups, where
> fixes come before the cleanup patches. The patchset starts with adding the
> stop_link() platform-specific method invocation in case of the PCIe host
> probe procedure errors. It has been missing in the cleanup-on-error path
> of the DW PCIe Host initialization method. After that the unrolled CSRs
> layout is added to the iATU disable procedure. In third the disable iATU
> procedure is fixed to be called only for the internal ATU as being
> specific for the internal ATU implementation. Then the outbound iATU
> extended region setup procedure is fixed to have the INCREASE_REGION_SIZE
> flag set based on the limit-address - not the region size one. The last
> but not least the CDM-check enabling procedure is fixed to be independent
> from the non-related num_lanes field state.
>
> Afterwards there is a series of cleanups. It concerns the changes like
> adding braces to the multi-line if-else constructions, trailing new-lines
> to the print format-string, dropping unnecessary version checking, and
> various code simplifications and optimizations.
>
> New features like adding two-level DT bindings abstraction, adding better
> structured IP-core version interface, adding iATU regions size detection
> and the PCIe regions verification procedure, adding dma-ranges support,
> introducing a set of generic platform clocks and resets and finally adding
> Baikal-T1 PCIe interface support will be submitted in the next part of the
> series.
>
> Link: https://lore.kernel.org/linux-pci/20220324012524.16784-1-Sergey.Semin@baikalelectronics.ru/
> Changelog v2:
> - Fix the end address of the example in the patch log with
> the INCREASE_REGION_SIZE flag usage fixup. It should be
> 0x1000FFFF and not 0x0000FFFF (@Manivannan).
> - Add the cleanup-on-error path to the dw_pcie_ep_init() function.
> (@Manivannan)
>
> Link: https://lore.kernel.org/linux-pci/20220503212300.30105-1-Sergey.Semin@baikalelectronics.ru/
> Changelog v3:
> - Convert region variable type to u32 in order to fix the implicit type
> conversion peculiarity. (@kbot)
> - Rebase onto v5.18-rc6.
>
> Link: https://lore.kernel.org/linux-pci/20220517125058.18488-1-Sergey.Semin@baikalelectronics.ru/
> Changelog v4:
> - Move the patch "PCI: dwc: Deallocate EPC memory on EP init error" to
> being applied before the cleanup patches.
> - Add a new fixes patch: "PCI: dwc: Enable CDM-check independently from
> the num_lanes value".
> - Add a new cleanup patch: "PCI: dwc: Organize local variables usage".
> - Add a new cleanup patch: "PCI: dwc: Re-use local pointer to the
> resource data".
> - Add a new cleanup patch: "PCI: dwc: Add start_link/stop_link inliners".
> - Add a new cleanup patch: "PCI: dwc: Move io_cfg_atu_shared to the Root
> Port descriptor".
> - Add a new cleanup patch: "PCI: dwc: Add dw_ prefix to the pcie_port
> structure name".
> - Drop the patch "PCI: dwc: Don't use generic IO-ops for DBI-space
> access". (@Rob)
> - Drop Manivannan tested tag from the changed patches.
> - Rebase onto 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: Jingoo Han <jingoohan1@...il.com>
> Cc: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
> Cc: "Krzysztof Wilczyński" <kw@...ux.com>
> Cc: Frank Li <Frank.Li@....com>
> Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Cc: linux-pci@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
>
> Serge Semin (18):
> PCI: dwc: Stop link in the host init error and de-initialization
> PCI: dwc: Add unroll iATU space support to the regions disable method
> PCI: dwc: Disable outbound windows for controllers with iATU
> PCI: dwc: Set INCREASE_REGION_SIZE flag based on limit address
> PCI: dwc: Deallocate EPC memory on EP init error
> PCI: dwc: Enable CDM-check independently from the num_lanes value
> PCI: dwc: Add braces to the multi-line if-else statements
> PCI: dwc: Add trailing new-line literals to the log messages
> PCI: dwc: Discard IP-core version checking on unrolled iATU detection
> PCI: dwc: Convert Link-up status method to using dw_pcie_readl_dbi()
> PCI: dwc: Organize local variables usage
> PCI: dwc: Re-use local pointer to the resource data
> PCI: dwc: Add start_link/stop_link inliners
> PCI: dwc: Move io_cfg_atu_shared to the Root Port descriptor
> PCI: dwc: Add dw_ prefix to the pcie_port structure name
> PCI: dwc-plat: Simplify the probe method return value handling
> PCI: dwc-plat: Discard unused regmap pointer
> PCI: dwc-plat: Drop dw_plat_pcie_of_match forward declaration
>
> drivers/pci/controller/dwc/pci-dra7xx.c | 12 +-
> drivers/pci/controller/dwc/pci-exynos.c | 6 +-
> drivers/pci/controller/dwc/pci-imx6.c | 6 +-
> drivers/pci/controller/dwc/pci-keystone.c | 20 ++--
> .../pci/controller/dwc/pci-layerscape-ep.c | 12 --
> drivers/pci/controller/dwc/pci-layerscape.c | 2 +-
> drivers/pci/controller/dwc/pci-meson.c | 2 +-
> drivers/pci/controller/dwc/pcie-al.c | 6 +-
> drivers/pci/controller/dwc/pcie-armada8k.c | 4 +-
> drivers/pci/controller/dwc/pcie-artpec6.c | 4 +-
> .../pci/controller/dwc/pcie-designware-ep.c | 30 +++--
> .../pci/controller/dwc/pcie-designware-host.c | 104 ++++++++++--------
> .../pci/controller/dwc/pcie-designware-plat.c | 25 +----
> drivers/pci/controller/dwc/pcie-designware.c | 72 +++++++-----
> drivers/pci/controller/dwc/pcie-designware.h | 46 +++++---
> drivers/pci/controller/dwc/pcie-dw-rockchip.c | 4 +-
> drivers/pci/controller/dwc/pcie-fu740.c | 2 +-
> drivers/pci/controller/dwc/pcie-histb.c | 10 +-
> drivers/pci/controller/dwc/pcie-intel-gw.c | 6 +-
> drivers/pci/controller/dwc/pcie-keembay.c | 4 +-
> drivers/pci/controller/dwc/pcie-kirin.c | 2 +-
> drivers/pci/controller/dwc/pcie-qcom.c | 4 +-
> drivers/pci/controller/dwc/pcie-spear13xx.c | 6 +-
> drivers/pci/controller/dwc/pcie-tegra194.c | 22 ++--
> drivers/pci/controller/dwc/pcie-uniphier.c | 10 +-
> drivers/pci/controller/dwc/pcie-visconti.c | 6 +-
> 26 files changed, 225 insertions(+), 202 deletions(-)
This doesn't apply cleanly on v5.19-rc1 (my "main" branch). v5.19-rc1
was tagged June 5, but apparently v4 was rebased to v5.18 and posted
June 10? That's just a non-starter because many of these files were
changed during the merge window between v5.18 and v5.19-rc1.
I'll be looking for an ack from Jingoo and/or Gustavo, maintainers of
pcie-designware.c and related files.
Generally I wait for owners of files to comment before I review in
detail. This is just expedient because they know the code better than
I do and can resolve lots of things in parallel before getting
single-threaded on me or Lorenzo.
Bjorn
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