1 files changed, 3 insertions, 31 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/dma.c b/drivers/gpu/nvgpu/common/linux/dma.c
index 81aebb7d..c13dae8b 100644
--- a/drivers/gpu/nvgpu/common/linux/dma.c
+++ b/drivers/gpu/nvgpu/common/linux/dma.c
@@ -222,16 +222,6 @@ int nvgpu_dma_alloc_flags_sys(struct gk20a *g, unsigned long flags,
         void *alloc_ret;
 
         /*
-         * WAR for IO coherent chips: the DMA API does not seem to generate
-         * mappings that work correctly. Unclear why - Bug ID: 2040115.
-         *
-         * Basically we just tell the DMA API not to map with NO_KERNEL_MAPPING
-         * and then make a vmap() ourselves.
-         */
-        if (nvgpu_is_enabled(g, NVGPU_USE_COHERENT_SYSMEM))
-                flags |= NVGPU_DMA_NO_KERNEL_MAPPING;
-
-        /*
          * Before the debug print so we see this in the total. But during
          * cleanup in the fail path this has to be subtracted.
          */
@@ -265,17 +255,7 @@ int nvgpu_dma_alloc_flags_sys(struct gk20a *g, unsigned long flags,
                                         iova, size, flags);
         }
         if (err)
-                goto fail_free_dma;
-
-        if (nvgpu_is_enabled(g, NVGPU_USE_COHERENT_SYSMEM)) {
-                mem->cpu_va = vmap(mem->priv.pages,
-                                   size >> PAGE_SHIFT,
-                                   0, PAGE_KERNEL);
-                if (!mem->cpu_va) {
-                        err = -ENOMEM;
-                        goto fail_free_sgt;
-                }
-        }
+                goto fail_free;
 
         mem->aligned_size = size;
         mem->aperture = APERTURE_SYSMEM;
@@ -285,14 +265,12 @@ int nvgpu_dma_alloc_flags_sys(struct gk20a *g, unsigned long flags,
 
         return 0;
 
-fail_free_sgt:
-        nvgpu_free_sgtable(g, &mem->priv.sgt);
-fail_free_dma:
+fail_free:
+        g->dma_memory_used -= mem->aligned_size;
         dma_free_attrs(d, size, alloc_ret, iova, NVGPU_DMA_ATTR(dma_attrs));
         mem->cpu_va = NULL;
         mem->priv.sgt = NULL;
         mem->size = 0;
-        g->dma_memory_used -= mem->aligned_size;
         return err;
 }
 
@@ -488,12 +466,6 @@ static void nvgpu_dma_free_sys(struct gk20a *g, struct nvgpu_mem *mem)
         if (!(mem->mem_flags & NVGPU_MEM_FLAG_SHADOW_COPY) &&
             !(mem->mem_flags & __NVGPU_MEM_FLAG_NO_DMA) &&
             (mem->cpu_va || mem->priv.pages)) {
-                /*
-                 * Free side of WAR for bug 2040115.
-                 */
-                if (nvgpu_is_enabled(g, NVGPU_USE_COHERENT_SYSMEM))
-                        vunmap(mem->cpu_va);
-
                 if (mem->priv.flags) {
                         NVGPU_DEFINE_DMA_ATTRS(dma_attrs);