linux-kernel - Re: [PATCH v5 5/7] udmabuf: introduce udmabuf init and deinit helper

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Message-ID: <5970129f-5787-424f-ad7c-ee8568a1734b@vivo.com>
Date: Fri, 6 Sep 2024 16:38:52 +0800
From: Huan Yang <link@...o.com>
To: "Kasireddy, Vivek" <vivek.kasireddy@...el.com>,
 Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 Gerd Hoffmann <kraxel@...hat.com>,
 "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
 "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
 "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc: "opensource.kernel@...o.com" <opensource.kernel@...o.com>
Subject: Re: [PATCH v5 5/7] udmabuf: introduce udmabuf init and deinit helper


在 2024/9/6 16:20, Kasireddy, Vivek 写道:
> Hi Huan,
>
>> Subject: [PATCH v5 5/7] udmabuf: introduce udmabuf init and deinit helper
>>
>> After udmabuf is allocated, its resources need to be initialized,
>> including various array structures. The current array structure has
>> already been greatly expanded.
>>
>> Also, before udmabuf needs to be kfree, the occupied resources need to
>> be released.
>>
>> This part is repetitive and maybe overlooked.
>>
>> This patch give a helper function when init and deinit, by this,
>> deduce duplicate code.
> *reduce
>
> If possible, please try to improve the wording and grammatical correctness
> in the commit messages of other patches as well.

I'll fix it in next-version

>
>> Signed-off-by: Huan Yang <link@...o.com>
>> ---
>>   drivers/dma-buf/udmabuf.c | 52 +++++++++++++++++++++++----------------
>>   1 file changed, 31 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
>> index ca2b21c5c57f..254d9ec3d9f3 100644
>> --- a/drivers/dma-buf/udmabuf.c
>> +++ b/drivers/dma-buf/udmabuf.c
>> @@ -226,6 +226,28 @@ static int add_to_unpin_list(struct list_head
>> *unpin_list,
>>   	return 0;
>>   }
>>
>> +static __always_inline int init_udmabuf(struct udmabuf *ubuf, pgoff_t
>> pgcnt)
>> +{
>> +	INIT_LIST_HEAD(&ubuf->unpin_list);
>> +
>> +	ubuf->folios = kvmalloc_array(pgcnt, sizeof(*ubuf->folios),
>> GFP_KERNEL);
>> +	if (!ubuf->folios)
>> +		return -ENOMEM;
>> +
>> +	ubuf->offsets = kvcalloc(pgcnt, sizeof(*ubuf->offsets), GFP_KERNEL);
>> +	if (!ubuf->offsets)
>> +		return -ENOMEM;
>> +
>> +	return 0;
>> +}
>> +
>> +static __always_inline void deinit_udmabuf(struct udmabuf *ubuf)
>> +{
>> +	unpin_all_folios(&ubuf->unpin_list);
>> +	kvfree(ubuf->offsets);
>> +	kvfree(ubuf->folios);
>> +}
>> +
>>   static void release_udmabuf(struct dma_buf *buf)
>>   {
>>   	struct udmabuf *ubuf = buf->priv;
>> @@ -234,9 +256,7 @@ static void release_udmabuf(struct dma_buf *buf)
>>   	if (ubuf->sg)
>>   		put_sg_table(dev, ubuf->sg, DMA_BIDIRECTIONAL);
>>
>> -	unpin_all_folios(&ubuf->unpin_list);
>> -	kvfree(ubuf->offsets);
>> -	kvfree(ubuf->folios);
>> +	deinit_udmabuf(ubuf);
>>   	kfree(ubuf);
>>   }
>>
>> @@ -396,33 +416,24 @@ static long udmabuf_create(struct miscdevice
>> *device,
>>   	if (!ubuf)
>>   		return -ENOMEM;
>>
>> -	INIT_LIST_HEAD(&ubuf->unpin_list);
>>   	pglimit = (size_limit_mb * 1024 * 1024) >> PAGE_SHIFT;
>>   	for (i = 0; i < head->count; i++) {
>>   		if (!PAGE_ALIGNED(list[i].offset))
>> -			goto err;
>> +			goto err_noinit;
>>   		if (!PAGE_ALIGNED(list[i].size))
>> -			goto err;
>> +			goto err_noinit;
>>
>>   		pgcnt += list[i].size >> PAGE_SHIFT;
>>   		if (pgcnt > pglimit)
>> -			goto err;
>> +			goto err_noinit;
>>   	}
>>
>>   	if (!pgcnt)
>> -		goto err;
>> +		goto err_noinit;
>>
>> -	ubuf->folios = kvmalloc_array(pgcnt, sizeof(*ubuf->folios),
>> GFP_KERNEL);
>> -	if (!ubuf->folios) {
>> -		ret = -ENOMEM;
>> +	ret = init_udmabuf(ubuf, pgcnt);
>> +	if (ret)
>>   		goto err;
>> -	}
>> -
>> -	ubuf->offsets = kvcalloc(pgcnt, sizeof(*ubuf->offsets), GFP_KERNEL);
>> -	if (!ubuf->offsets) {
>> -		ret = -ENOMEM;
>> -		goto err;
>> -	}
>>
>>   	for (i = 0; i < head->count; i++) {
>>   		struct file *memfd = fget(list[i].memfd);
>> @@ -446,9 +457,8 @@ static long udmabuf_create(struct miscdevice
>> *device,
>>   	return ret;
>>
>>   err:
>> -	unpin_all_folios(&ubuf->unpin_list);
>> -	kvfree(ubuf->offsets);
>> -	kvfree(ubuf->folios);
>> +	deinit_udmabuf(ubuf);
>> +err_noinit:
> I don't really see the need for this new label, but I guess it makes things a
> bit clear.

If not this, each list err will need kfree, I think use this more clear.

Thank you. :)

>
> Acked-by: Vivek Kasireddy <vivek.kasireddy@...el.com>
>
>>   	kfree(ubuf);
>>   	return ret;
>>   }
>> --
>> 2.45.2