linux-kernel - Re: [PATCH v7 07/12] powerpc/vas: Define vas_win_paste

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Message-ID: <8760dcugxy.fsf@concordia.ellerman.id.au>
Date:   Fri, 25 Aug 2017 19:36:57 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        mikey@...ling.org, stewart@...ux.vnet.ibm.com, apopple@....ibm.com,
        hbabu@...ibm.com, oohall@...il.com, linuxppc-dev@...abs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 07/12] powerpc/vas: Define vas_win_paste_addr()

Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> writes:

> Define an interface that the NX drivers can use to find the physical
> paste address of a send window. This interface is expected to be used
> with the mmap() operation of the NX driver's device. i.e the user space
> process can use driver's mmap() operation to map the send window's paste
> address into their address space and then use copy and paste instructions
> to submit the CRBs to the NX engine.
>
> Note that kernel drivers will use vas_paste_crb() directly and don't need
> this interface.

AFAICS this is not used. And if it was that would be a problem because
there are implications in letting userspace do paste, so can you drop
this from the series for now.

cheers