From: Gerd Hoffmann <kraxel@redhat.com>
To: "Chen, Xiaoguang" <xiaoguang.chen@intel.com>,
Alex Williamson <alex.williamson@redhat.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
"intel-gfx@lists.freedesktop.org"
<intel-gfx@lists.freedesktop.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"zhenyuw@linux.intel.com" <zhenyuw@linux.intel.com>,
"chris@chris-wilson.co.uk" <chris@chris-wilson.co.uk>,
"Lv, Zhiyuan" <zhiyuan.lv@intel.com>,
"intel-gvt-dev@lists.freedesktop.org"
<intel-gvt-dev@lists.freedesktop.org>,
"Wang, Zhi A" <zhi.a.wang@intel.com>
Subject: Re: [PATCH v6 6/6] drm/i915/gvt: Adding interface so user space can get the dma-buf
Date: Tue, 06 Jun 2017 09:35:28 +0200 [thread overview]
Message-ID: <1496734528.15129.2.camel@redhat.com> (raw)
In-Reply-To: <DD379D741F77464281CE7ED1CD7C12DE7066B9F5@SHSMSX101.ccr.corp.intel.com>
Hi,
> > Why the ref count is one?
>
> The gem object is created by us while creating the dma-buf(the ref
> count of the gem object is initialized to 1).
> Later when user import the dma-buf the ref count of the gem object
> associate with the dma-buf will increased.
Creating the dma-buf should increase the gem object reference count
too. So you should be able to unref the gem object after creating the
dma-buf. That way the dma-buf is the only instance holding a reference
to the gem object, and when the dma-buf goes away (due to userspace
closing all file handles referring to it) the gem object will be
released too because the refcount goes down to zero then.
cheers,
Gerd
next prev parent reply other threads:[~2017-06-06 7:35 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-27 8:38 [PATCH v6 0/6] drm/i915/gvt: Dma-buf support for GVT-g Xiaoguang Chen
2017-05-27 8:38 ` [PATCH v6 1/6] drm/i915/gvt: Extend the GVT-g architecture to support vfio device region Xiaoguang Chen
2017-05-27 8:38 ` [PATCH v6 2/6] drm/i915/gvt: OpRegion support for GVT-g Xiaoguang Chen
2017-05-31 4:47 ` Zhenyu Wang
2017-05-31 6:22 ` Chen, Xiaoguang
2017-05-31 6:30 ` Zhenyu Wang
2017-05-31 6:44 ` Chen, Xiaoguang
2017-05-27 8:38 ` [PATCH v6 3/6] drm/i915/gvt: Frame buffer decoder " Xiaoguang Chen
2017-05-31 5:12 ` Zhenyu Wang
2017-05-31 6:46 ` Chen, Xiaoguang
2017-05-27 8:38 ` [PATCH v6 4/6] vfio: Define vfio based vgpu's dma-buf operations Xiaoguang Chen
2017-05-29 7:20 ` Gerd Hoffmann
2017-05-31 6:18 ` Chen, Xiaoguang
2017-05-31 17:22 ` Kirti Wankhede
2017-06-01 3:01 ` Chen, Xiaoguang
2017-06-01 16:38 ` Alex Williamson
2017-06-01 18:46 ` Kirti Wankhede
2017-06-02 8:38 ` Gerd Hoffmann
2017-06-05 8:26 ` Kirti Wankhede
2017-06-06 7:59 ` Gerd Hoffmann
2017-05-27 8:38 ` [PATCH v6 5/6] drm/i915/gvt: Dmabuf support for GVT-g Xiaoguang Chen
2017-05-31 12:04 ` Gerd Hoffmann
2017-06-01 3:02 ` Chen, Xiaoguang
2017-06-01 9:15 ` Chris Wilson
2017-05-27 8:38 ` [PATCH v6 6/6] drm/i915/gvt: Adding interface so user space can get the dma-buf Xiaoguang Chen
2017-06-01 18:08 ` Alex Williamson
2017-06-02 3:24 ` Chen, Xiaoguang
2017-06-02 3:34 ` Alex Williamson
2017-06-02 9:31 ` Chen, Xiaoguang
2017-06-02 14:58 ` Alex Williamson
2017-06-02 15:23 ` Gerd Hoffmann
2017-06-05 2:39 ` Chen, Xiaoguang
2017-06-06 7:35 ` Gerd Hoffmann [this message]
2017-05-30 10:23 ` [PATCH v6 0/6] drm/i915/gvt: Dma-buf support for GVT-g Gerd Hoffmann
2017-05-31 2:29 ` Chen, Xiaoguang
2017-05-31 8:59 ` Gerd Hoffmann
2017-05-31 9:07 ` Chen, Xiaoguang
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