[PATCH 1/2] drm/nouveau/bar: add noncached ioremap property

Alexandre Courbot
2014-06-27T10:29:33Z

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>
---
drivers/gpu/drm/nouveau/core/include/subdev/bar.h | 3 +++
drivers/gpu/drm/nouveau/nouveau_bo.c | 17 ++++++++++++-----
2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/core/include/subdev/bar.h b/drivers/gpu/drm/nouveau/core/include/subdev/bar.h
index 9faa98e67ad8..9002cbb6432b 100644
--- 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 --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index b6dc85c614be..4db886f9f793 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -500,18 +500,25 @@ nouveau_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
man->default_caching = TTM_PL_FLAG_CACHED;
break;
case TTM_PL_VRAM:
+ man->flags = TTM_MEMTYPE_FLAG_FIXED |
+ TTM_MEMTYPE_FLAG_MAPPABLE;
+ man->available_caching = TTM_PL_FLAG_UNCACHED |
+ TTM_PL_FLAG_WC;
+ man->default_caching = TTM_PL_FLAG_WC;
+
if (nv_device(drm->device)->card_type >= NV_50) {
+ /* Some BARs do not support being ioremapped WC */
+ if (nouveau_bar(drm->device)->iomap_uncached) {
+ man->available_caching = TTM_PL_FLAG_UNCACHED;
+ man->default_caching = TTM_PL_FLAG_UNCACHED;
+ }
+
man->func = &nouveau_vram_manager;
man->io_reserve_fastpath = false;
man->use_io_reserve_lru = true;
} else {
man->func = &ttm_bo_manager_func;
}
- man->flags = TTM_MEMTYPE_FLAG_FIXED |
- TTM_MEMTYPE_FLAG_MAPPABLE;
- man->available_caching = TTM_PL_FLAG_UNCACHED |
- TTM_PL_FLAG_WC;
- man->default_caching = TTM_PL_FLAG_WC;
break;
case TTM_PL_TT:
if (nv_device(drm->device)->card_type >= NV_50)
--
2.0.0