linux-kernel - Re: [PATCH 1/2] drm: rockchip: Don't pass DRM fake offset to dma-api

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Date:	Sat, 18 Apr 2015 18:55:14 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	linux-rockchip@...ts.infradead.org, mark.yao@...k-chips.com
Cc:	Ørjan Eide <orjan.eide@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, djkurtz@...omium.org
Subject: Re: [PATCH 1/2] drm: rockchip: Don't pass DRM fake offset to dma-api

Am Donnerstag, 16. April 2015, 16:41:51 schrieb Ørjan Eide:
> Set vm_pgoff to 0 after using it to look up the GEM node, before passing
> it on rockchip_gem_mmap_buf() where the offset must be from the start of
> the buffer.
> 
> Passing in the fake offset currently works because the
> dma_mmap_attrs implementation that is used for this device,
> arm_iommu_mmap_attrs, ignores the offset completely.
> 
> Signed-off-by: Ørjan Eide <orjan.eide@....com>

both patches on a rk3288-veyron-pinky

Tested-by: Heiko Stuebner <heiko@...ech.de>

Through which tree do you want to take these patches? I guess the rockchip-drm 
related patch should go through the tree that will take the dma-mapping patch, 
so you'll probably need an "Ack" from Mark Yao (Cc'ed).


Heiko

> ---
>  drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c index 7ca8799e..69f01c3
> 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> @@ -94,6 +94,11 @@ int rockchip_gem_mmap(struct file *filp, struct
> vm_area_struct *vma) return -EACCES;
>  	}
> 
> +	/* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
> +	 * whole buffer from the start.
> +	 */
> +	vma->vm_pgoff = 0;
> +
>  	obj = container_of(node, struct drm_gem_object, vma_node);
>  	ret = rockchip_gem_mmap_buf(obj, vma);

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