linux-kernel - Re: [PATCH 01/12] drm/ttm: Use ttm_bo_default_io_mem_pfn if io_mem

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Date:   Mon, 25 Dec 2017 09:24:30 +0800
From:   Tan Xiaojun <tanxiaojun@...wei.com>
To:     <christian.koenig@....com>, <seanpaul@...omium.org>,
        <airlied@...ux.ie>, <michel.daenzer@....com>,
        <alexander.deucher@....com>, <nicolai.haehnle@....com>,
        <thomas.lendacky@....com>, <yamada.masahiro@...ionext.com>,
        <msrb@...e.com>, <Felix.Kuehling@....com>, <dave.jiang@...el.com>,
        <gregkh@...uxfoundation.org>, <michael.thayer@...cle.com>,
        <hdegoede@...hat.com>
CC:     <daniel.vetter@...el.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/12] drm/ttm: Use ttm_bo_default_io_mem_pfn if
 io_mem_pfn is NULL

On 2017/12/24 17:27, Christian König wrote:
> Am 24.12.2017 um 07:14 schrieb Tan Xiaojun:
>> From: Michal Srb <msrb@...e.com>
>>
>> The io_mem_pfn field was added in commit ea642c3216cb2a60d1c0e760ae47ee85c9c16447
>> and is called unconditionally. However, not all drivers were updated to set it.
>>
>> Use the ttm_bo_default_io_mem_pfn function if a driver did not set its own.
>>
>> Signed-off-by: Michal Srb <msrb@...e.com>
>> ---
>>   drivers/gpu/drm/ttm/ttm_bo_vm.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
>> index c8ebb75..e25a99b 100644
>> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
>> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
>> @@ -234,7 +234,10 @@ static int ttm_bo_vm_fault(struct vm_fault *vmf)
>>           if (bo->mem.bus.is_iomem) {
>>               /* Iomem should not be marked encrypted */
>>               cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
>> -            pfn = bdev->driver->io_mem_pfn(bo, page_offset);
>> +            if (bdev->driver->io_mem_pfn)
>> +                pfn = bdev->driver->io_mem_pfn(bo, page_offset);
>> +            else
>> +                pfn = ttm_bo_default_io_mem_pfn(bo, page_offset);
> 
> Please move this check into a new function ttm_bo_io_mem_pfn().
> 
> You can then move the calculation of ttm_bo_default_io_mem_pfn() into this new function in patch #12 as well.
> 
> Regards,
> Christian.
> 

OK. Thank you for your reply. I will modify it and send v2.

Thanks.
Xiaojun.

>>           } else {
>>               page = ttm->pages[page_offset];
>>               if (unlikely(!page && i == 0)) {
> 
> 
> .
>