linux-kernel - Re: [PATCH v3 7/9] xen/gntdev: Add initial support for dma-buf UAPI

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Date:   Wed, 13 Jun 2018 11:17:17 +0300
From:   Oleksandr Andrushchenko <Oleksandr_Andrushchenko@...m.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Oleksandr Andrushchenko <andr2000@...il.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        jgross@...e.com, konrad.wilk@...cle.com
Cc:     daniel.vetter@...el.com, dongwon.kim@...el.com,
        matthew.d.roper@...el.com
Subject: Re: [PATCH v3 7/9] xen/gntdev: Add initial support for dma-buf UAPI

On 06/13/2018 04:49 AM, Boris Ostrovsky wrote:
>
>
> On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
>
>> diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
>> index a09db23e9663..e82660d81d7e 100644
>> --- a/drivers/xen/gntdev.c
>> +++ b/drivers/xen/gntdev.c
>> @@ -48,6 +48,9 @@
>>   #include <asm/xen/hypercall.h>
>>     #include "gntdev-common.h"
>> +#ifdef CONFIG_XEN_GNTDEV_DMABUF
>> +#include "gntdev-dmabuf.h"
>> +#endif
>>     MODULE_LICENSE("GPL");
>>   MODULE_AUTHOR("Derek G. Murray <Derek.Murray@...cam.ac.uk>, "
>> @@ -566,6 +569,15 @@ static int gntdev_open(struct inode *inode, 
>> struct file *flip)
>>       INIT_LIST_HEAD(&priv->freeable_maps);
>>       mutex_init(&priv->lock);
>>   +#ifdef CONFIG_XEN_GNTDEV_DMABUF
>> +    priv->dmabuf_priv = gntdev_dmabuf_init();
>> +    if (IS_ERR(priv->dmabuf_priv)) {
>> +        ret = PTR_ERR(priv->dmabuf_priv);
>> +        kfree(priv);
>> +        return ret;
>> +    }
>> +#endif
>> +
>>       if (use_ptemod) {
>>           priv->mm = get_task_mm(current);
>>           if (!priv->mm) {
>> @@ -616,8 +628,13 @@ static int gntdev_release(struct inode *inode, 
>> struct file *flip)
>>       WARN_ON(!list_empty(&priv->freeable_maps));
>>       mutex_unlock(&priv->lock);
>>   +#ifdef CONFIG_XEN_GNTDEV_DMABUF
>> +    gntdev_dmabuf_fini(priv->dmabuf_priv);
>> +#endif
>> +
>>       if (use_ptemod)
>>           mmu_notifier_unregister(&priv->mn, priv->mm);
>> +
>>       kfree(priv);
>>       return 0;
>>   }
>> @@ -987,6 +1004,107 @@ static long gntdev_ioctl_grant_copy(struct 
>> gntdev_priv *priv, void __user *u)
>>       return ret;
>>   }
>>   +#ifdef CONFIG_XEN_GNTDEV_DMABUF
>> +static long
>> +gntdev_ioctl_dmabuf_exp_from_refs(struct gntdev_priv *priv,
>> +                  struct ioctl_gntdev_dmabuf_exp_from_refs __user *u)
>
>
> Didn't we agree that this code moves to gntdev-dmabuf.c ?
>
Sure, didn't think we want IOCTL's code to be moved as well,
but that does make sense - will move all
> -boris
>
Thank you,
Oleksandr