Re: what does the glob array mean in DRM?

From: Thomas Hellstrom <thellstrom@vmware.com>
To: z f <taishan901028@gmail.com>
Cc: "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>
Subject: Re: what does the glob array mean in DRM?
Date: Wed, 15 Apr 2015 07:34:47 +0200	[thread overview]
Message-ID: <552DF877.3000301@vmware.com> (raw)
In-Reply-To: <CADvLq85G5R6GxKnoP972OwJik19yWdGoB5R3gNtdsnMwASTLJg@mail.gmail.com>

Hi.

It's a generic interface for stuff that needs to be global across all
devices. Currently I think it's only used for
ttm memory accounting.

Thanks,
Thomas

On 04/15/2015 07:13 AM, z f wrote:
> hi, I am start reading the DRM code in Linux.
> drm_core_init() -> drm_global_init()
> the later does something like this:
>
> struct drm_global_item {
>         struct mutex mutex;
>         void *object;
>         int refcount;
> };
>
> static struct drm_global_item glob[DRM_GLOBAL_NUM];
>
> void drm_global_init(void)
> {
>         int i;
>
>         for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
>                 struct drm_global_item *item = &glob[i];
>                 mutex_init(&item->mutex);
>                 item->object = NULL;
>                 item->refcount = 0;
>         }
> }
>
> what's the glob array used for?
> sorry for asking question so sample, because I cant find great
> acticles to learn DRM.

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