On Tue, Jul 11, 2017 at 3:38 PM, Rob Clark <robdclark@xxxxxxxxx> wrote:
> +static unsigned long hijack_firmware_fb(struct drm_device *dev)
> +{
> + struct msm_drm_private *priv = dev->dev_private;
> + unsigned long size;
> + int i;
> +
> + /* if we have simplefb/efifb, find it's aperture and hijack
> + * that before we kick out the firmware fb's.
> + *
> + * TODO we probably should hold registration_lock
> + */
> + for (i = 0; i < FB_MAX; i++) {
> + struct fb_info *fb = get_fb_info(i);
> +
> + if (IS_ERR_OR_NULL(fb))
> + continue;
> +
> + if (!fb->apertures->count)
> + continue;
> +
> + /* if we find efifb or simplefb, we are about to
> + * kick them out, so hijack their memory:
> + */
> + if ((strcmp(fb->fix.id, "EFI VGA") == 0) ||
> + (strcmp(fb->fix.id, "simple") == 0)) {
> +
> + priv->vram.paddr = fb->apertures->ranges[0].base;
> + size = fb->apertures->ranges[0].size;
> + }
> +
> + put_fb_info(fb);
> +
> + if (size)
> + return size;
> + }
> +
> + return 0;
> +}
I think this should be a helper function in at least drm_fb_helper.c,
which would then fill in both base&size in a passed-in struct. But
yeah this seems a lot better than the old one.
In the future we could then also extend this with kicking out other
firmware fb things.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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