linux-kernel - Re: Resizeable PCI BAR support V5

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Message-ID: <20170614185212.GC20778@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 14 Jun 2017 13:52:13 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Christian König <deathsimple@...afone.de>
Cc:     linux-pci@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org
Subject: Re: Resizeable PCI BAR support V5

On Fri, Jun 09, 2017 at 10:59:41AM +0200, Christian König wrote:
> Hi everyone,
> 
> This is the fith incarnation of this set of patches. It enables device
> drivers to resize and most likely also relocate the PCI BAR of devices 
> they manage to allow the CPU to access all of the device local memory at once.

I think this is really v7, isn't it?  I see a v6 posted May 9.

> This is very useful for GFX device drivers where the default PCI BAR is only
> about 256MB in size for compatibility reasons, but the device easily have
> multiple gigabyte of local memory.
> 
> Some changes since V4:
> 1. Rebased on 4.11.

I apply patches to topic branches based on -rc1.  I did apply these by
hand, but it's easier if they apply cleanly to -rc1.

> 2. added the rb from Andy Shevchenko to patches which look complete now.
> 3. Move releasing the BAR and reallocating it on error to the driver side.
> 4. Add amdgpu support for GMC V6 hardware generation as well.
> 
> Please review and/or comment,
> Christian.
>