linux-kernel - Re: PCI Endpoint - Missing inbound mapping ops ?

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Date:   Tue, 14 Aug 2018 15:08:00 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Ramon Fried <ramon.fried@...il.com>, lorenzo.pieralisi@....com,
        bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: PCI Endpoint - Missing inbound mapping ops ?

Hi Kishon,

On Tue, Aug 14, 2018 at 2:53 PM, Kishon Vijay Abraham I <kishon@...com> wrote:
> Hi,
>
> On Tuesday 14 August 2018 06:19 PM, Ramon Fried wrote:
>> Hi.
>> I recently saw that the PCI endpoint API only supports outbound memory
>> mapping: (AXI -> PCI) through the map_addr op.
>> Why inbound mapping is missing (PCI->AXI) is missing ?
>> In almost all of the PCI EP controllers I've worked with there was a
>> need to map complete BARS or part of BARS to mmio/aperature regions on
>> the device.
>
> pci_epc_set_bar() is used for mapping BAR.

Just to let you know, the ARC/DKIM seems wrong according to gmail and
is marked as spam. It seems it happens from time to time. Bjorn
Helgaas (in CC) also had the same problem a couple of years ago.

Cheers,
Miguel

>
> Thanks
> Kishon