linux-kernel - RE: [PATCH v2 1/5] PCI: dwc: Add msi_host

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Message-ID: <DM5PR12MB12768F1777C7302708DAB3A7DABD0@DM5PR12MB1276.namprd12.prod.outlook.com>
Date:   Fri, 15 May 2020 13:20:40 +0000
From:   Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Marc Zyngier <marc.zyngier@....com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: RE: [PATCH v2 1/5] PCI: dwc: Add msi_host_isr() callback

[+cc Marc; IRQ DOMAINS (IRQ NUMBER MAPPING LIBRARY) maintainer]

On Fri, May 15, 2020 at 10:58:59, Kunihiko Hayashi 
<hayashi.kunihiko@...ionext.com> wrote:

> This adds msi_host_isr() callback function support to describe
> SoC-dependent service triggered by MSI.
> 
> For example, when AER interrupt is triggered by MSI, the callback function
> reads SoC-dependent registers and detects that the interrupt is from AER,
> and invoke AER interrupts related to MSI.
> 
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++----
>  drivers/pci/controller/dwc/pcie-designware.h      | 1 +
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 42fbfe2..7dd1021 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -112,13 +112,13 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
>  static void dw_chained_msi_isr(struct irq_desc *desc)
>  {
>  	struct irq_chip *chip = irq_desc_get_chip(desc);
> -	struct pcie_port *pp;
> +	struct pcie_port *pp = irq_desc_get_handler_data(desc);
>  
> -	chained_irq_enter(chip, desc);
> +	if (pp->ops->msi_host_isr)
> +		pp->ops->msi_host_isr(pp);
>  
> -	pp = irq_desc_get_handler_data(desc);
> +	chained_irq_enter(chip, desc);
>  	dw_handle_msi_irq(pp);
> -
>  	chained_irq_exit(chip, desc);
>  }
>  
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 656e00f..e741967 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -170,6 +170,7 @@ struct dw_pcie_host_ops {
>  	void (*scan_bus)(struct pcie_port *pp);
>  	void (*set_num_vectors)(struct pcie_port *pp);
>  	int (*msi_host_init)(struct pcie_port *pp);
> +	void (*msi_host_isr)(struct pcie_port *pp);
>  };
>  
>  struct pcie_port {
> -- 
> 2.7.4