Am 08.02.2018 um 09:32 schrieb Chunming Zhou:
it will be used to check if the driver needs swiotlb
Change-Id: Idbe47af8f12032d4803bb3d47273e807f19169c3
Signed-off-by: Chunming Zhou <david1.zhou@xxxxxxx>
Reviewed-by: Monk Liu <monk.liu@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx> for the whole
series.
---
include/drm/drm_cache.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/include/drm/drm_cache.h b/include/drm/drm_cache.h
index beab0f0d0cfb..442c9ba63d03 100644
--- a/include/drm/drm_cache.h
+++ b/include/drm/drm_cache.h
@@ -39,6 +39,19 @@ void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
void drm_clflush_sg(struct sg_table *st);
void drm_clflush_virt_range(void *addr, unsigned long length);
+static inline u64 drm_get_max_iomem(void)
+{
+ struct resource *tmp;
+ u64 max_iomem = 0;
+
+ for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
+ max_iomem = max(max_iomem, tmp->end);
+ }
+
+ return max_iomem;
+}
+
+
static inline bool drm_arch_can_wc_memory(void)
{
#if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
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