Revert "gpu: nvgpu: Get coherency on gv100 + NVLINK working"

Also revert other changes related to IO coherence. This may be the
culprit in a recent dev-kernel lockdown.

Bug 2070609

Change-Id: Ida178aef161fadbc6db9512521ea51c702c1564b
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1665914
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Srikar Srimath Tirumala <srikars@nvidia.com>

2 files changed, 8 insertions, 19 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/enabled.h b/drivers/gpu/nvgpu/include/nvgpu/enabled.h
index 24748a19..a3d9df24 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/enabled.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/enabled.h
@@ -75,8 +75,8 @@ struct gk20a;
 #define NVGPU_SUPPORT_MAP_DIRECT_KIND_CTRL      24
 /* Support batch mapping */
 #define NVGPU_SUPPORT_MAP_BUFFER_BATCH          25
-/* Use coherent aperture for sysmem. */
-#define NVGPU_USE_COHERENT_SYSMEM               26
+/* Support DMA coherence */
+#define NVGPU_DMA_COHERENT                      26
 /* Use physical scatter tables instead of IOMMU */
 #define NVGPU_MM_USE_PHYSICAL_SG                27
 
diff --git a/drivers/gpu/nvgpu/include/nvgpu/nvgpu_mem.h b/drivers/gpu/nvgpu/include/nvgpu/nvgpu_mem.h
index f1ab8a6e..2b8b7015 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/nvgpu_mem.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/nvgpu_mem.h
@@ -25,7 +25,6 @@
 
 #include <nvgpu/types.h>
 #include <nvgpu/list.h>
-#include <nvgpu/enabled.h>
 
 #ifdef __KERNEL__
 #include <nvgpu/linux/nvgpu_mem.h>
@@ -52,10 +51,6 @@ struct nvgpu_page_alloc;
 enum nvgpu_aperture {
         APERTURE_INVALID = 0, /* unallocated or N/A */
         APERTURE_SYSMEM,
-
-         /* Don't use directly. Use APERTURE_SYSMEM, this is used internally. */
-        __APERTURE_SYSMEM_COH,
-
         APERTURE_VIDMEM
 };
 
@@ -192,18 +187,12 @@ nvgpu_mem_from_clear_list_entry(struct nvgpu_list_node *node)
                                             clear_list_entry));
 };
 
-static inline const char *nvgpu_aperture_str(struct gk20a *g,
-                                             enum nvgpu_aperture aperture)
+static inline const char *nvgpu_aperture_str(enum nvgpu_aperture aperture)
 {
         switch (aperture) {
-        case APERTURE_INVALID:
-                return "INVAL";
-        case APERTURE_SYSMEM:
-                return "SYSMEM";
-        case __APERTURE_SYSMEM_COH:
-                return "SYSCOH";
-        case APERTURE_VIDMEM:
-                return "VIDMEM";
+                case APERTURE_INVALID: return "INVAL";
+                case APERTURE_SYSMEM:  return "SYSMEM";
+                case APERTURE_VIDMEM:  return "VIDMEM";
         };
         return "UNKNOWN";
 }
@@ -333,9 +322,9 @@ u64 nvgpu_mem_get_addr(struct gk20a *g, struct nvgpu_mem *mem);
 u64 nvgpu_mem_get_phys_addr(struct gk20a *g, struct nvgpu_mem *mem);
 
 u32 __nvgpu_aperture_mask(struct gk20a *g, enum nvgpu_aperture aperture,
-                u32 sysmem_mask, u32 sysmem_coh_mask, u32 vidmem_mask);
+                u32 sysmem_mask, u32 vidmem_mask);
 u32 nvgpu_aperture_mask(struct gk20a *g, struct nvgpu_mem *mem,
-                u32 sysmem_mask, u32 sysmem_coh_mask, u32 vidmem_mask);
+                u32 sysmem_mask, u32 vidmem_mask);
 
 u64 nvgpu_mem_iommu_translate(struct gk20a *g, u64 phys);