fbdev: allow passing more than one aperture for handoff

It removes a hack from nouveau code which had to detect which
region to pass to kick vesafb/efifb.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 26 insertions, 3 deletions

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index a15b44e9c003..03f2dc2470b5 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1468,16 +1468,39 @@ static int fb_check_foreignness(struct fb_info *fi)
         return 0;
 }
 
-static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
+static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
 {
         /* is the generic aperture base the same as the HW one */
-        if (gen->aperture_base == hw->aperture_base)
+        if (gen->base == hw->base)
                 return true;
         /* is the generic aperture base inside the hw base->hw base+size */
-        if (gen->aperture_base > hw->aperture_base && gen->aperture_base <= hw->aperture_base + hw->aperture_size)
+        if (gen->base > hw->base && gen->base <= hw->base + hw->size)
                 return true;
         return false;
 }
+
+static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
+{
+        int i, j;
+        struct apertures_struct *hwa = hw->apertures;
+        struct apertures_struct *gena = gen->apertures;
+        if (!hwa || !gena)
+                return false;
+
+        for (i = 0; i < hwa->count; ++i) {
+                struct aperture *h = &hwa->ranges[i];
+                for (j = 0; j < gena->count; ++j) {
+                        struct aperture *g = &gena->ranges[j];
+                        printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
+                                g->base, g->size, h->base, h->size);
+                        if (apertures_overlap(g, h))
+                                return true;
+                }
+        }
+
+        return false;
+}
+
 /**
  *      register_framebuffer - registers a frame buffer device
  *      @fb_info: frame buffer info structure