drm/nouveau/bar: add noncached ioremap property

Some BARs (like GK20A's) do not support being ioremapped write-combined.
Add a boolean property to the BAR structure and handle that case in the
Nouveau BO implementation.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

diff --git a/drivers/gpu/drm/nouveau/core/include/subdev/bar.h b/drivers/gpu/drm/nouveau/core/include/subdev/bar.h
index 9faa98e..9002cbb 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/include/subdev/bar.h
+++ b/drivers/gpu/drm/nouveau/core/include/subdev/bar.h
@@ -20,6 +20,9 @@ struct nouveau_bar {
                    u32 flags, struct nouveau_vma *);
        void (*unmap)(struct nouveau_bar *, struct nouveau_vma *);
        void (*flush)(struct nouveau_bar *);
+
+       /* whether the BAR supports to be ioremapped WC or should be uncached */
+       bool iomap_uncached;
 };
 
 static inline struct nouveau_bar *

diff --cc drivers/gpu/drm/nouveau/nouveau_bo.c
Simple merge