linux-kernel - Re: [PATCH 30/39] PCI: Bulk conversion to generic_handle_domain

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Message-ID: <CAL_Jsq+nu8PmONzx2AfysRWuhJDV9Xn3O5rCOfEZL0KoC12_qw@mail.gmail.com>
Date:   Thu, 20 May 2021 12:47:06 -0500
From:   Rob Herring <robh@...nel.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Russell King <linux@...linux.org.uk>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH 30/39] PCI: Bulk conversion to generic_handle_domain_irq()

On Thu, May 20, 2021 at 11:57 AM Marc Zyngier <maz@...nel.org> wrote:
>
> Wherever possible, replace constructs that match either
> generic_handle_irq(irq_find_mapping()) or
> generic_handle_irq(irq_linear_revmap()) to a single call to
> generic_handle_domain_irq().
>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>  drivers/pci/controller/dwc/pci-dra7xx.c        | 14 +++++---------
>  drivers/pci/controller/dwc/pci-keystone.c      |  5 ++---
>  .../pci/controller/dwc/pcie-designware-host.c  |  9 ++++-----
>  drivers/pci/controller/dwc/pcie-uniphier.c     |  6 ++----
>  .../controller/mobiveil/pcie-mobiveil-host.c   | 15 ++++++---------
>  drivers/pci/controller/pci-aardvark.c          |  5 ++---
>  drivers/pci/controller/pci-ftpci100.c          |  2 +-
>  drivers/pci/controller/pci-tegra.c             |  8 +++-----
>  drivers/pci/controller/pci-xgene-msi.c         |  9 +++------
>  drivers/pci/controller/pcie-altera-msi.c       | 10 ++++------
>  drivers/pci/controller/pcie-altera.c           | 10 ++++------
>  drivers/pci/controller/pcie-brcmstb.c          |  9 ++++-----
>  drivers/pci/controller/pcie-iproc-msi.c        |  4 +---
>  drivers/pci/controller/pcie-mediatek-gen3.c    | 13 ++++---------
>  drivers/pci/controller/pcie-mediatek.c         | 12 ++++--------
>  drivers/pci/controller/pcie-microchip-host.c   | 18 +++++++-----------
>  drivers/pci/controller/pcie-rcar-host.c        |  8 +++-----
>  drivers/pci/controller/pcie-rockchip-host.c    |  8 +++-----
>  drivers/pci/controller/pcie-xilinx-cpm.c       |  4 ++--
>  drivers/pci/controller/pcie-xilinx-nwl.c       | 13 +++----------
>  drivers/pci/controller/pcie-xilinx.c           |  9 ++++-----
>  21 files changed, 71 insertions(+), 120 deletions(-)


> diff --git a/drivers/pci/controller/pci-xgene-msi.c b/drivers/pci/controller/pci-xgene-msi.c
> index 1c34c897a7e2..cf3832b905e8 100644
> --- a/drivers/pci/controller/pci-xgene-msi.c
> +++ b/drivers/pci/controller/pci-xgene-msi.c
> @@ -291,8 +291,7 @@ static void xgene_msi_isr(struct irq_desc *desc)
>         struct irq_chip *chip = irq_desc_get_chip(desc);
>         struct xgene_msi_group *msi_groups;
>         struct xgene_msi *xgene_msi;
> -       unsigned int virq;
> -       int msir_index, msir_val, hw_irq;
> +       int msir_index, msir_val, hw_irq, ret;
>         u32 intr_index, grp_select, msi_grp;
>
>         chained_irq_enter(chip, desc);
> @@ -330,10 +329,8 @@ static void xgene_msi_isr(struct irq_desc *desc)
>                          * CPU0
>                          */
>                         hw_irq = hwirq_to_canonical_hwirq(hw_irq);
> -                       virq = irq_find_mapping(xgene_msi->inner_domain, hw_irq);
> -                       WARN_ON(!virq);
> -                       if (virq != 0)
> -                               generic_handle_irq(virq);
> +                       ret = generic_handle_domain_irq(xgene_msi->inner_domain, hw_irq);
> +                       WARN_ON(ret);

There's various error prints in some of the handlers. I think they
should be moved to the core. I can't imagine handling the irq is ever
optional.

Rob