[PATCH 1/3] drm: add func to get max iomem address

[Christian König]

Am 08.02.2018 um 10:09 schrieb Michel Dänzer:
> On 2018-02-08 09:32 AM, Chunming Zhou wrote:
>> it will be used to check if the driver needs swiotlb
>>
>> Change-Id: Idbe47af8f12032d4803bb3d47273e807f19169c3
>> Signed-off-by: Chunming Zhou <david1.zhou at amd.com>
>> Reviewed-by: Monk Liu <monk.liu at amd.com>
>> ---
>>   include/drm/drm_cache.h | 13 +++++++++++++
>>   1 file changed, 13 insertions(+)
>>
>> diff --git a/include/drm/drm_cache.h b/include/drm/drm_cache.h
>> index beab0f0d0cfb..442c9ba63d03 100644
>> --- a/include/drm/drm_cache.h
>> +++ b/include/drm/drm_cache.h
>> @@ -39,6 +39,19 @@ void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
>>   void drm_clflush_sg(struct sg_table *st);
>>   void drm_clflush_virt_range(void *addr, unsigned long length);
>>   
>> +static inline u64 drm_get_max_iomem(void)
>> +{
>> +	struct resource *tmp;
>> +	u64 max_iomem = 0;
>> +
>> +	for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
>> +		max_iomem = max(max_iomem,  tmp->end);
>> +	}
>> +
>> +	return max_iomem;
>> +}
> I don't think this needs to be an inline function, does it?

Well it is defined in a header, so it must be inline because of this.

But if you know a good place, we could also move it into some C file.

Christian.