linux-kernel - Re: [PATCH v9 1/3] dmaengine: ptdma: Initial driver for the AMD PTDMA

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Message-ID: <0bc4e249-b8ce-1d92-ddde-b763667a0bcb@amd.com>
Date:   Wed, 16 Jun 2021 10:24:52 +0530
From:   Sanjay R Mehta <sanmehta@....com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Sanjay R Mehta <Sanju.Mehta@....com>, gregkh@...uxfoundation.org,
        dan.j.williams@...el.com, Thomas.Lendacky@....com,
        Shyam-sundar.S-k@....com, Nehal-bakulchandra.Shah@....com,
        robh@...nel.org, mchehab+samsung@...nel.org, davem@...emloft.net,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v9 1/3] dmaengine: ptdma: Initial driver for the AMD PTDMA



On 6/16/2021 9:45 AM, Vinod Koul wrote:
> [CAUTION: External Email]
> 
> On 15-06-21, 16:50, Sanjay R Mehta wrote:
> 
>>>> +static struct pt_device *pt_alloc_struct(struct device *dev)
>>>> +{
>>>> +     struct pt_device *pt;
>>>> +
>>>> +     pt = devm_kzalloc(dev, sizeof(*pt), GFP_KERNEL);
>>>> +
>>>> +     if (!pt)
>>>> +             return NULL;
>>>> +     pt->dev = dev;
>>>> +     pt->ord = atomic_inc_return(&pt_ordinal);
>>>
>>> What is the use of this number?
>>>
>>
>> There are eight similar instances of this DMA engine on AMD SOC.
>> It is to differentiate each of these instances.
> 
> Are they individual device objects?
> 

Yes, they are individual device objects.

> --
> ~Vinod
>