diff options
Diffstat (limited to 'drivers/gpu/drm/drm_memory.c')
| -rw-r--r-- | drivers/gpu/drm/drm_memory.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c index 40c4349cb939..fbea69d6f909 100644 --- a/drivers/gpu/drm/drm_memory.c +++ b/drivers/gpu/drm/drm_memory.c @@ -1,4 +1,4 @@ -/** +/* * \file drm_memory.c * Memory management wrappers for DRM * @@ -33,9 +33,16 @@ * OTHER DEALINGS IN THE SOFTWARE. */ -#include <linux/highmem.h> #include <linux/export.h> -#include <drm/drmP.h> +#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> +#include <drm/drm_device.h> + #include "drm_legacy.h" #if IS_ENABLED(CONFIG_AGP) @@ -150,15 +157,34 @@ void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev) } EXPORT_SYMBOL(drm_legacy_ioremapfree); -u64 drm_get_max_iomem(void) +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; + return max_iomem > ((u64)1 << dma_bits); } -EXPORT_SYMBOL(drm_get_max_iomem); +EXPORT_SYMBOL(drm_need_swiotlb); |