From: Dave Airlie <airlied@xxxxxxxxxx>
These will be used by drivers to reserve/free WC memory in the
PAT tracking tables, for VRAM BARs.
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo_util.c | 24 ++++++++++++++++++++++++
include/drm/ttm/ttm_bo_driver.h | 2 ++
2 files changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index bf6e216..192c003 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -39,6 +39,13 @@
#include <linux/module.h>
#include <linux/reservation.h>
+#ifdef CONFIG_X86
+#include <asm/pat.h>
+#else
+#define io_reserve_memtype(start, end, pcm) (0)
+#define io_free_memtype(start, end)
+#endif
+
void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
{
ttm_bo_mem_put(bo, &bo->mem);
@@ -796,3 +803,20 @@ int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
return 0;
}
EXPORT_SYMBOL(ttm_bo_pipeline_move);
+
+int ttm_io_reserve_memtype_wc(resource_size_t start, resource_size_t end)
+{
+ enum page_cache_mode pcm = _PAGE_CACHE_MODE_WC;
+ int ret;
+ ret = io_reserve_memtype(start, end, &pcm);
+ if (ret)
+ return ret;
+ return 0;
+}
+EXPORT_SYMBOL(ttm_io_reserve_memtype_wc);
+
+void ttm_io_free_memtype(resource_size_t start, resource_size_t end)
+{
+ io_free_memtype(start, end);
+}
+EXPORT_SYMBOL(ttm_io_free_memtype);
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 4f0a921..6b2d24e 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -1054,6 +1054,8 @@ int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
*/
extern pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp);
+int ttm_io_reserve_memtype_wc(resource_size_t start, resource_size_t end);
+void ttm_io_free_memtype(resource_size_t start, resource_size_t end);
extern const struct ttm_mem_type_manager_func ttm_bo_manager_func;
#if IS_ENABLED(CONFIG_AGP)
--
2.5.5
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