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

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Date:	Mon, 20 Apr 2015 13:34:57 +0800
From:	Mark yao <mark.yao@...k-chips.com>
To:	Heiko Stübner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org
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

On 2015年04月19日 00:55, Heiko Stübner wrote:
> 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);
>
>
>
Thanks for this fix,
Acked-by: Mark Yao <mark.yao@...k-chips.com>

-- 
Ｍark

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