Re: what does the glob array mean in DRM?

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.