Message-ID: <CAPnjgZ38G2Xzz1pTp3kCdaTZrDe+hKoBbqsGLKHyLfjUM7wH7g@mail.gmail.com>
Date:   Thu, 3 Jun 2021 12:02:28 -0600
From:   Simon Glass <sjg@...omium.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Pali Rohár <pali@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Marek Behún <kabel@...nel.org>,
        Remi Pommarel <repk@...plefau.lt>, Xogium <contact@...ium.me>,
        Tomasz Maciej Nowak <tmn505@...il.com>,
        Marc Zyngier <maz@...nel.org>, linux-pci@...r.kernel.org,
        lak <linux-arm-kernel@...ts.infradead.org>,
        lk <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/42] PCI: aardvark: Various driver fixes

Hi,

On Thu, 3 Jun 2021 at 09:17, Lorenzo Pieralisi
<lorenzo.pieralisi@....com> wrote:
>
> On Thu, May 06, 2021 at 05:31:11PM +0200, Pali Rohár wrote:
> > This patch series fixes various issues in pci-aardvark.c driver
> > (PCIe controller on Marvell Armada 3700 SoC) used on Espressobin
> > and Turris Mox.
> >
> > First patch fixes kernel panic (or TF-A panic depending on used
> > firmware) during execution of PIO transfer and I would suggest to
> > include this fix into v5.13 release to prevent future kernel panics.
> >
> > Other patches then fixes PIO issues, PCIe link training, initialization
> > of PCIe controller, accessing PCIe Root Bridge/Port registers, handling
> > of interrupts (including ERR and PME), setup of Multi-MSI interrupts,
> > adding support for masking MSI interrupts, adding support for more than
> > 32 MSI interrupts with MSI-X support, and adding support for AER.
> >
> > Note that there are still some unresolved issues with PCIe on A3720.
> > I asked Marvell for PCIe documentation or explanations but I have not
> > received anything (yet).
> >
> > Patch "Fix checking for PIO status" is taken from the Marvell github fork
> > and adapted for inclusion into mainline kernel:
> > https://github.com/MarvellEmbeddedProcessors/linux-marvell/commit/84444d22023c
> >
> > Whole patch series is available also in my git branch pci-aardvark:
> > https://git.kernel.org/pub/scm/linux/kernel/git/pali/linux.git/log/?h=pci-aardvark
> >
> > If you have Espressobin, Turris Mox or other A3720 board with PCIe
> > please test this patch series with your favourite PCIe card if
> > everything is working fine.
> >
> > Evan Wang (1):
> >   PCI: aardvark: Fix checking for PIO status
> >
> > Pali Rohár (39):
> >   PCI: aardvark: Fix kernel panic during PIO transfer
> >   PCI: aardvark: Fix checking for PIO Non-posted Request
> >   PCI: aardvark: Increase polling delay to 1.5s while waiting for PIO
> >     response
> >   PCI: pci-bridge-emul: Add PCIe Root Capabilities Register
> >   PCI: aardvark: Fix reporting CRS Software Visibility on emulated
> >     bridge
> >   PCI: aardvark: Fix link training
> >   PCI: Add PCI_EXP_DEVCTL_PAYLOAD_* macros
> >   PCI: aardvark: Fix PCIe Max Payload Size setting
> >   PCI: aardvark: Implement workaround for the readback value of VEND_ID
> >   PCI: aardvark: Do not touch status bits of masked interrupts in
> >     interrupt handler
> >   PCI: aardvark: Check for virq mapping when processing INTx IRQ
> >   PCI: aardvark: Remove irq_mask_ack callback for INTx interrupts
> >   PCI: aardvark: Don't mask irq when mapping
> >   PCI: aardvark: Change name of INTx irq_chip to advk-INT
> >   PCI: aardvark: Remove unneeded goto
> >   PCI: aardvark: Fix support for MSI interrupts
> >   PCI: aardvark: Correctly clear and unmask all MSI interrupts
> >   PCI: aardvark: Fix setting MSI address
> >   PCI: aardvark: Add support for more than 32 MSI interrupts
> >   PCI: aardvark: Add support for masking MSI interrupts
> >   PCI: aardvark: Enable MSI-X support
> >   PCI: aardvark: Fix support for ERR interrupt on emulated bridge
> >   PCI: aardvark: Fix support for PME on emulated bridge
> >   PCI: aardvark: Fix support for PME requester on emulated bridge
> >   PCI: aardvark: Fix support for bus mastering and PCI_COMMAND on
> >     emulated bridge
> >   PCI: aardvark: Disable bus mastering and mask all interrupts when
> >     unbinding driver
> >   PCI: aardvark: Free config space for emulated root bridge when
> >     unbinding driver to fix memory leak
> >   PCI: aardvark: Reset PCIe card and disable PHY when unbinding driver
> >   PCI: aardvark: Rewrite irq code to chained irq handler
> >   PCI: aardvark: Use separate INTA interrupt for emulated root bridge
> >   PCI: pci-bridge-emul: Add description for class_revision field
> >   PCI: pci-bridge-emul: Add definitions for missing capabilities
> >     registers
> >   PCI: aardvark: Add support for DEVCAP2, DEVCTL2, LNKCAP2 and LNKCTL2
> >     registers on emulated bridge
> >   PCI: aardvark: Add support for PCI_BRIDGE_CTL_BUS_RESET on emulated
> >     bridge
> >   PCI: aardvark: Replace custom PCIE_CORE_ERR_CAPCTL_* macros by
> >     linux/pci_regs.h macros
> >   PCI: aardvark: Replace custom PCIE_CORE_INT_* macros by linux
> >     PCI_INTERRUPT_* values
> >   PCI: aardvark: Cleanup some register macros
> >   PCI: aardvark: Add comments for OB_WIN_ENABLE and ADDR_WIN_DISABLE
> >   PCI: aardvark: Add support for Advanced Error Reporting registers on
> >     emulated bridge
> >
> > Russell King (2):
> >   PCI: pci-bridge-emul: re-arrange register tests
> >   PCI: pci-bridge-emul: add support for PCIe extended capabilities
> >
> >  drivers/pci/controller/pci-aardvark.c | 980 +++++++++++++++++++-------
> >  drivers/pci/pci-bridge-emul.c         | 149 ++--
> >  drivers/pci/pci-bridge-emul.h         |  17 +-
> >  include/uapi/linux/pci_regs.h         |   6 +
> >  4 files changed, 850 insertions(+), 302 deletions(-)
>
> May I ask you please to split this series in smaller sets so that
> it is easier to merge ?
>
> Let's start with the more urgent fixes that don't involve rework (or
> you have not received change requests for since they are simple).

Is this due to the difficulty / time for reviewing them?

I feel it is a bit tough to ask someone to split a series, when it is
already nicely split into patches. Reordering to put the important
things first seems reasonable. Otherwise perhaps people can just
review what they can?

Regards,
Simon

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