linux-kernel - Re: [PATCH 5/6] MIPS: implement architecture dependent 'pci_remap

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Date:   Sat, 25 Sep 2021 19:32:12 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Liviu Dudau <Liviu.Dudau@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        gregkh <gregkh@...uxfoundation.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-staging@...ts.linux.dev, neil@...wn.name,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] MIPS: implement architecture dependent 'pci_remap_iospace()'

On Fri, Sep 24, 2021 at 11:11 PM Sergio Paracuellos
<sergio.paracuellos@...il.com> wrote:
>
> To make PCI IO work we need to properly virtually map IO cpu physical address
> and set this virtual address as the address of the first PCI IO port which
> is set using function 'set_io_port_base()'.
>
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>

Acked-by: Arnd Bergmann <arnd@...db.de>

> +int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
> +{
> +       size_t size = (res->end - res->start) + 1;
> +       unsigned long vaddr = (unsigned long)ioremap(phys_addr, size);
> +
> +       set_io_port_base(vaddr);
> +       return 0;
> +}

It might be good to check that res->start is zero here, otherwise
the io_port_base would be off. That could happen if you ever have more
than one bridge.

        Arnd