drm: Implement drm_need_swiotlb() in drm_cache.c

The function is declared in drm_cache.h. I also removed the curly
braces from the for loop to adhere to kernel coding style.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210112081035.6882-3-tzimmermann@suse.de

1 files changed, 0 insertions, 33 deletions

diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c
index f4f2bffdd5bd..e4f20a2eb6e7 100644
--- a/drivers/gpu/drm/drm_memory.c
+++ b/drivers/gpu/drm/drm_memory.c
@@ -37,7 +37,6 @@
 #include <linux/highmem.h>
 #include <linux/pci.h>
 #include <linux/vmalloc.h>
-#include <xen/xen.h>
 
 #include <drm/drm_agpsupport.h>
 #include <drm/drm_cache.h>
@@ -138,35 +137,3 @@ void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
 		iounmap(map->handle);
 }
 EXPORT_SYMBOL(drm_legacy_ioremapfree);
-
-bool drm_need_swiotlb(int dma_bits)
-{
-	struct resource *tmp;
-	resource_size_t max_iomem = 0;
-
-	/*
-	 * Xen paravirtual hosts require swiotlb regardless of requested dma
-	 * transfer size.
-	 *
-	 * NOTE: Really, what it requires is use of the dma_alloc_coherent
-	 *       allocator used in ttm_dma_populate() instead of
-	 *       ttm_populate_and_map_pages(), which bounce buffers so much in
-	 *       Xen it leads to swiotlb buffer exhaustion.
-	 */
-	if (xen_pv_domain())
-		return true;
-
-	/*
-	 * Enforce dma_alloc_coherent when memory encryption is active as well
-	 * for the same reasons as for Xen paravirtual hosts.
-	 */
-	if (mem_encrypt_active())
-		return true;
-
-	for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
-		max_iomem = max(max_iomem,  tmp->end);
-	}
-
-	return max_iomem > ((u64)1 << dma_bits);
-}
-EXPORT_SYMBOL(drm_need_swiotlb);