drm/etnaviv: block 64K of address space behind each cmdstream

To make sure we don't place anything there which might confuse
the FE prefetcher. This gets rid of another case of FE MMU faults
when the address space gets crowded before triggering the reaper.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
index d3796ed8d8c5b2808cd9edba22d5d10a57563917..169ac96e8f0861f9648e0e3ca3292ca1da61556c 100644 (file)
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -330,7 +330,8 @@ u32 etnaviv_iommu_get_cmdbuf_va(struct etnaviv_gpu *gpu,
                        return (u32)buf->vram_node.start;
 
                mutex_lock(&mmu->lock);
-               ret = etnaviv_iommu_find_iova(mmu, &buf->vram_node, buf->size);
+               ret = etnaviv_iommu_find_iova(mmu, &buf->vram_node,
+                                             buf->size + SZ_64K);
                if (ret < 0) {
                        mutex_unlock(&mmu->lock);
                        return 0;