drm/vmwgfx: Delay pinning fbdev framebuffer until after mode set

For the Screen Object display unit, we need to reserve a
guest-invisible region equal to the size of the framebuffer for
the host.  This region can only be reserved in VRAM, whereas
the guest-visible framebuffer can be reserved in either VRAM or
GMR.

As such priority should be given to the guest-invisible
region otherwise in a limited VRAM situation, we can fail to
allocate this region.

This patch makes it so that vmw_sou_backing_alloc() is called
before the framebuffer is pinned.

Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Cc: <stable@vger.kernel.org>
---
This is the last patch of a 3-patch series to fix console black
screen issue on Ubuntu 16.04 server

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
index 679a4cb..66eaa30 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -517,28 +517,6 @@ static int vmw_fb_kms_framebuffer(struct fb_info *info)
 
        par->set_fb = &vfb->base;
 
-       if (!par->bo_ptr) {
-               /*
-                * Pin before mapping. Since we don't know in what placement
-                * to pin, call into KMS to do it for us.
-                */
-               ret = vfb->pin(vfb);
-               if (ret) {
-                       DRM_ERROR("Could not pin the fbdev framebuffer.\n");
-                       return ret;
-               }
-
-               ret = ttm_bo_kmap(&par->vmw_bo->base, 0,
-                                 par->vmw_bo->base.num_pages, &par->map);
-               if (ret) {
-                       vfb->unpin(vfb);
-                       DRM_ERROR("Could not map the fbdev framebuffer.\n");
-                       return ret;
-               }
-
-               par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
-       }
-
        return 0;
 }
 
@@ -601,6 +579,31 @@ static int vmw_fb_set_par(struct fb_info *info)
        if (ret)
                goto out_unlock;
 
+       if (!par->bo_ptr) {
+               struct vmw_framebuffer *vfb = vmw_framebuffer_to_vfb(set.fb);
+
+               /*
+                * Pin before mapping. Since we don't know in what placement
+                * to pin, call into KMS to do it for us.
+                */
+               ret = vfb->pin(vfb);
+               if (ret) {
+                       DRM_ERROR("Could not pin the fbdev framebuffer.\n");
+                       return ret;
+               }
+
+               ret = ttm_bo_kmap(&par->vmw_bo->base, 0,
+                                 par->vmw_bo->base.num_pages, &par->map);
+               if (ret) {
+                       vfb->unpin(vfb);
+                       DRM_ERROR("Could not map the fbdev framebuffer.\n");
+                       return ret;
+               }
+
+               par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
+       }
+
+
        vmw_fb_dirty_mark(par, par->fb_x, par->fb_y,
                          par->set_fb->width, par->set_fb->height);