drm/nv50-nvc0: restrict memtype to those specified at creation time

Upcoming patches are going to enable full support for buffers that keep
a constant GPU virtual address whenever they're validated for use by
the GPU.

In order for this to work properly while keeping support for large pages,
we need to know if it's ever going to be possible for a buffer to end
up in GART, and if so, disable large pages for the buffer's VMA.

This is a new restriction that's not present in earlier kernel's, but
should not break userspace as the current code never attempts to validate
buffers into a memtype other than it was created with.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 931dade12edd..cfdecd31f802 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -54,8 +54,8 @@ nouveau_bo_del_ttm(struct ttm_buffer_object *bo)
 }
 
 static void
-nouveau_bo_fixup_align(struct nouveau_bo *nvbo, int *align, int *size,
-                       int *page_shift)
+nouveau_bo_fixup_align(struct nouveau_bo *nvbo, u32 flags,
+                       int *align, int *size, int *page_shift)
 {
         struct drm_nouveau_private *dev_priv = nouveau_bdev(nvbo->bo.bdev);
 
@@ -80,7 +80,7 @@ nouveau_bo_fixup_align(struct nouveau_bo *nvbo, int *align, int *size,
                 }
         } else {
                 if (likely(dev_priv->chan_vm)) {
-                        if (*size > 256 * 1024)
+                        if (!(flags & TTM_PL_FLAG_TT) &&  *size > 256 * 1024)
                                 *page_shift = dev_priv->chan_vm->lpg_shift;
                         else
                                 *page_shift = dev_priv->chan_vm->spg_shift;
@@ -113,7 +113,7 @@ nouveau_bo_new(struct drm_device *dev, struct nouveau_channel *chan,
         nvbo->tile_flags = tile_flags;
         nvbo->bo.bdev = &dev_priv->ttm.bdev;
 
-        nouveau_bo_fixup_align(nvbo, &align, &size, &page_shift);
+        nouveau_bo_fixup_align(nvbo, flags, &align, &size, &page_shift);
         align >>= PAGE_SHIFT;
 
         if (dev_priv->chan_vm) {