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From: Arnd Bergmann <arnd@arndb.de>
To: Cai Huoqing <cai.huoqing@linux.dev>
Cc: "Arnd Bergmann" <arnd@arndb.de>,
	"Christian König" <christian.koenig@amd.com>,
	"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Maxime Ripard" <mripard@kernel.org>,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"David Airlie" <airlied@linux.ie>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Sumit Semwal" <sumit.semwal@linaro.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	"Linux Media Mailing List" <linux-media@vger.kernel.org>,
	linaro-mm-sig@lists.linaro.org
Subject: Re: [Linaro-mm-sig] Re: [PATCH v2 4/4] drm/nvdla/uapi: Add UAPI of NVDLA driver
Date: Tue, 26 Apr 2022 14:38:21 +0200	[thread overview]
Message-ID: <CAK8P3a2M=zw509HGRALmgbr+E6GjKoZqqkh9kCbyGB9hD_+3LA@mail.gmail.com> (raw)
In-Reply-To: <20220426122404.GA6788@chq-T47>

On Tue, Apr 26, 2022 at 2:24 PM Cai Huoqing <cai.huoqing@linux.dev> wrote:
> On 26 4月 22 12:50:50, Arnd Bergmann wrote:

> > > > +#define DRM_NVDLA_SUBMIT             0x00
> > > > +#define DRM_NVDLA_GEM_CREATE 0x01
> > > > +#define DRM_NVDLA_GEM_MMAP           0x02
> >
> > Is this an actual mmap() call, or something that needs to be done before the
> > mmap()? Is the 'handle' a file descriptor or some internal number?
> It's an gem object mmap which calls drm_gem_dumb_map_offset() inside and
> the handle is gem object handle.

Ok, thanks for the clarification. I see that other drivers have the
exact same thing,
so I assume it's fine for drivers/gpu/ then, even if it would be a bit odd for
other subsystems.

       Arnd

WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Cai Huoqing <cai.huoqing@linux.dev>
Cc: "Arnd Bergmann" <arnd@arndb.de>,
	"David Airlie" <airlied@linux.ie>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Sumit Semwal" <sumit.semwal@linaro.org>,
	linaro-mm-sig@lists.linaro.org,
	dri-devel <dri-devel@lists.freedesktop.org>,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"Christian König" <christian.koenig@amd.com>,
	"Linux Media Mailing List" <linux-media@vger.kernel.org>
Subject: Re: [Linaro-mm-sig] Re: [PATCH v2 4/4] drm/nvdla/uapi: Add UAPI of NVDLA driver
Date: Tue, 26 Apr 2022 14:38:21 +0200	[thread overview]
Message-ID: <CAK8P3a2M=zw509HGRALmgbr+E6GjKoZqqkh9kCbyGB9hD_+3LA@mail.gmail.com> (raw)
In-Reply-To: <20220426122404.GA6788@chq-T47>

On Tue, Apr 26, 2022 at 2:24 PM Cai Huoqing <cai.huoqing@linux.dev> wrote:
> On 26 4月 22 12:50:50, Arnd Bergmann wrote:

> > > > +#define DRM_NVDLA_SUBMIT             0x00
> > > > +#define DRM_NVDLA_GEM_CREATE 0x01
> > > > +#define DRM_NVDLA_GEM_MMAP           0x02
> >
> > Is this an actual mmap() call, or something that needs to be done before the
> > mmap()? Is the 'handle' a file descriptor or some internal number?
> It's an gem object mmap which calls drm_gem_dumb_map_offset() inside and
> the handle is gem object handle.

Ok, thanks for the clarification. I see that other drivers have the
exact same thing,
so I assume it's fine for drivers/gpu/ then, even if it would be a bit odd for
other subsystems.

       Arnd

  reply	other threads:[~2022-04-26 12:38 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-26  6:07 [PATCH v2 0/4] drm/nvdla: Add driver support for NVDLA Cai Huoqing
2022-04-26  6:07 ` Cai Huoqing
2022-04-26  6:07 ` [PATCH v2 1/4] MAINTAINERS: Add the driver info of the NVDLA Cai Huoqing
2022-04-26  6:07   ` Cai Huoqing
2022-04-26  6:07 ` [PATCH v2 2/4] drm/nvdla: Add driver support for NVDLA Cai Huoqing
2022-04-26  6:07   ` Cai Huoqing
2022-04-28 15:18   ` Thierry Reding
2022-04-28 15:18     ` Thierry Reding
2022-04-28 15:19     ` Thierry Reding
2022-04-28 15:19       ` Thierry Reding
2022-04-26  6:08 ` [PATCH v2 3/4] drm/nvdla: Add register head file of NVDLA Cai Huoqing
2022-04-26  6:08   ` Cai Huoqing
2022-04-28 14:31   ` Thierry Reding
2022-04-28 14:31     ` Thierry Reding
2022-04-26  6:08 ` [PATCH v2 4/4] drm/nvdla/uapi: Add UAPI of NVDLA driver Cai Huoqing
2022-04-26  6:08   ` Cai Huoqing
2022-04-26  6:31   ` Christian König
2022-04-26  6:31     ` Christian König
2022-04-26  8:23     ` Cai Huoqing
2022-04-26  8:23       ` Cai Huoqing
2022-04-26  8:29       ` Christian König
2022-04-26  8:29         ` Christian König
2022-04-28 14:45       ` Thierry Reding
2022-04-28 14:45         ` Thierry Reding
2022-04-29  3:58         ` Cai Huoqing
2022-04-29  3:58           ` Cai Huoqing
2022-04-26 10:50     ` [Linaro-mm-sig] " Arnd Bergmann
2022-04-26 10:50       ` Arnd Bergmann
2022-04-26 12:24       ` Cai Huoqing
2022-04-26 12:24         ` Cai Huoqing
2022-04-26 12:38         ` Arnd Bergmann [this message]
2022-04-26 12:38           ` Arnd Bergmann
2022-04-26 10:12   ` kernel test robot
2022-04-26 10:12     ` kernel test robot
2022-04-26 11:23   ` kernel test robot
2022-04-26 11:23     ` kernel test robot
2022-04-28 14:40   ` Thierry Reding
2022-04-28 14:40     ` Thierry Reding
2022-04-28 14:10 ` [PATCH v2 0/4] drm/nvdla: Add driver support for NVDLA Thierry Reding
2022-04-28 14:10   ` Thierry Reding
2022-04-28 15:56   ` Mikko Perttunen
2022-04-28 15:56     ` Mikko Perttunen
2022-04-28 16:35     ` Jon Hunter
2022-04-28 16:35       ` Jon Hunter
2022-04-29  3:37       ` Cai Huoqing
2022-04-29  3:37         ` Cai Huoqing
2022-04-29  3:28     ` Cai Huoqing
2022-04-29  3:28       ` Cai Huoqing
2022-05-02 17:04       ` Thierry Reding
2022-05-02 17:04         ` Thierry Reding
2022-05-07  9:05         ` Cai Huoqing
2022-05-07  9:05           ` Cai Huoqing

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