Subject: Re: [PATCH 08/13] swiotlb-xen: always use dma-direct helpers to alloc coherent pages

From: Boris Ostrovsky <[email-masked]>
Date: Tue, 3 Sep 2019 18:25:54 -0400

(Now with correct address for Juergen)

On 9/3/19 6:15 PM, Boris Ostrovsky wrote:
> On 9/2/19 9:03 AM, Christoph Hellwig wrote:
>> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
>> index b8808677ae1d..f9dd4cb6e4b3 100644
>> --- a/drivers/xen/swiotlb-xen.c
>> +++ b/drivers/xen/swiotlb-xen.c
>> @@ -299,8 +299,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
>>  	 * address. In fact on ARM virt_to_phys only works for kernel direct
>>  	 * mapped RAM memory. Also see comment below.
>>  	 */
>> -	ret = xen_alloc_coherent_pages(hwdev, size, dma_handle, flags, attrs);
>> -
>> +	ret = dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
>
> If I am reading __dma_direct_alloc_pages() correctly there is a path
> that will force us to use GFP_DMA32 and as Juergen pointed out in
> another message that may not be desirable.
>
> -boris
>
>
>

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