linux-kernel - Re: [PATCH v2 04/10] drm/nouveau/fb: add GK20A support

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Message-ID: <20140422104052.GB22426@ulmo>
Date:	Tue, 22 Apr 2014 12:40:53 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Ben Skeggs <bskeggs@...hat.com>, nouveau@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, gnurou@...il.com
Subject: Re: [PATCH v2 04/10] drm/nouveau/fb: add GK20A support

On Mon, Apr 21, 2014 at 03:02:16PM +0900, Alexandre Courbot wrote:
[...]
> diff --git a/drivers/gpu/drm/nouveau/core/subdev/fb/ramgk20a.c b/drivers/gpu/drm/nouveau/core/subdev/fb/ramgk20a.c
[...]
> +		pages = dma_alloc_from_contiguous(dev, ncmin, order);
> +		if (!pages) {
> +			gk20a_ram_put(pfb, &mem);
> +			return -ENOMEM;
> +		}
> +
> +		dma_addr = pfn_to_dma(nv_device_base(nv_device(pfb)),
> +				      page_to_pfn(pages));

This breaks compilation on x86 because neither pfn_to_dma() nor
dma_to_pfn() are available. Is there some other way this can be
allocated so that these functions don't need to be called?

Thierry

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