linux-kernel - Re: drm/msm: CONFIG_MSM

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Date:	Tue, 11 Feb 2014 12:29:49 -0500
From:	Rob Clark <robdclark@...il.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Richard Weinberger <richard@....at>,
	David Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: drm/msm: CONFIG_MSM_OCMEM?

On Tue, Feb 11, 2014 at 10:39 AM, Paul Bolle <pebolle@...cali.nl> wrote:
> Rob,
>
> Commit 55459968176f ("drm/msm: add a330/apq8x74") added preprocessor
> checks for CONFIG_MSM_OCMEM. But I couldn't find a Kconfig symbol
> MSM_OCMEM (nor a preprocessor define for a macro of that name). Why were
> those preprocessor checks added?

At the moment, CONFIG_MSM_OCMEM is only in downstream kernel.. not
100% sure about how we'll handle that upstream when there is more than
just drm/msm using OCMEM (which can be shared between gpu, video
enc/dec, etc).

> Please note that lines 197-201 currently read:
>     /* Set the OCMEM base address for A330, etc */
>     if (a3xx_gpu->ocmem_hdl) {
>             gpu_write(gpu, REG_A3XX_RB_GMEM_BASE_ADDR,
>                     (unsigned int)(a3xx_gpu->ocmem_base >> 14));
>     }
>
> ocmem_hdl and ocmem_base are used uninitialized here, aren't they? So it
> seems these lines should be wrapped with a preprocessor check for
> CONFIG_MSM_OCMEM too.

in this case ocmem_hdl will be NULL (since a3xx_gpu is kzalloc'd).
The #ifdef's could be added here, but not required.

BR,
-R

>
> Paul Bolle
>
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