linux-kernel - Re: [Linaro-mm-sig] Re: [PATCH v2 4/4] drm/nvdla/uapi: Add UAPI of NVDLA driver

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Date:   Tue, 26 Apr 2022 14:38:21 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Cai Huoqing <cai.huoqing@...ux.dev>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Christian König <christian.koenig@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linaro-mm-sig@...ts.linaro.org
Subject: Re: [Linaro-mm-sig] Re: [PATCH v2 4/4] drm/nvdla/uapi: Add UAPI of
 NVDLA driver

On Tue, Apr 26, 2022 at 2:24 PM Cai Huoqing <cai.huoqing@...ux.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