diff --git a/drivers/gpu/nvgpu/Makefile b/drivers/gpu/nvgpu/Makefile
index 6b327bcea..823a997eb 100644
--- a/drivers/gpu/nvgpu/Makefile
+++ b/drivers/gpu/nvgpu/Makefile
@@ -69,7 +69,8 @@ nvgpu-y += \
 	os/linux/os_sched.o \
 	os/linux/nvlink.o \
 	os/linux/dt.o \
-	os/linux/ecc_sysfs.o
+	os/linux/ecc_sysfs.o \
+	os/linux/ltc.o
 
 nvgpu-$(CONFIG_GK20A_VIDMEM) += \
 	os/linux/dmabuf_vidmem.o
diff --git a/drivers/gpu/nvgpu/common/fb/fb_gv11b.c b/drivers/gpu/nvgpu/common/fb/fb_gv11b.c
index 664b2dd12..6973e04d0 100644
--- a/drivers/gpu/nvgpu/common/fb/fb_gv11b.c
+++ b/drivers/gpu/nvgpu/common/fb/fb_gv11b.c
@@ -102,6 +102,8 @@ void gv11b_fb_init_cbc(struct gk20a *g, struct gr_gk20a *gr)
 	else
 		compbit_store_iova = nvgpu_mem_get_addr(g,
 							&gr->compbit_store.mem);
+	/* must be aligned to 64 KB */
+	compbit_store_iova = roundup(compbit_store_iova, (u64)SZ_64K);
 
 	compbit_base_post_divide64 = compbit_store_iova >>
 		fb_mmu_cbc_base_address_alignment_shift_v();
diff --git a/drivers/gpu/nvgpu/common/ltc.c b/drivers/gpu/nvgpu/common/ltc.c
index dec4a80c4..1beb19746 100644
--- a/drivers/gpu/nvgpu/common/ltc.c
+++ b/drivers/gpu/nvgpu/common/ltc.c
@@ -52,20 +52,3 @@ void nvgpu_ltc_sync_enabled(struct gk20a *g)
 	}
 	nvgpu_spinlock_release(&g->ltc_enabled_lock);
 }
-
-int nvgpu_ltc_alloc_cbc(struct gk20a *g, size_t compbit_backing_size)
-{
-	struct gr_gk20a *gr = &g->gr;
-	unsigned long flags = 0;
-
-	if (nvgpu_mem_is_valid(&gr->compbit_store.mem))
-		return 0;
-
-	if (!nvgpu_iommuable(g))
-		flags = NVGPU_DMA_FORCE_CONTIGUOUS;
-
-	return nvgpu_dma_alloc_flags_sys(g,
-					 flags,
-					 compbit_backing_size,
-					 &gr->compbit_store.mem);
-}
diff --git a/drivers/gpu/nvgpu/common/posix/stubs.c b/drivers/gpu/nvgpu/common/posix/stubs.c
index 0fa80bffe..1e50930ab 100644
--- a/drivers/gpu/nvgpu/common/posix/stubs.c
+++ b/drivers/gpu/nvgpu/common/posix/stubs.c
@@ -26,6 +26,7 @@
  */
 
 #include <nvgpu/ecc.h>
+#include <nvgpu/ltc.h>
 
 #include "gk20a/dbg_gpu_gk20a.h"
 
@@ -41,3 +42,8 @@ int nvgpu_ecc_sysfs_init(struct gk20a *g)
 void nvgpu_ecc_sysfs_remove(struct gk20a *g)
 {
 }
+
+int nvgpu_ltc_alloc_cbc(struct gk20a *g, size_t compbit_backing_size)
+{
+	return 0;
+}
diff --git a/drivers/gpu/nvgpu/os/linux/ltc.c b/drivers/gpu/nvgpu/os/linux/ltc.c
new file mode 100644
index 000000000..1a58bc4e2
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/ltc.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/ltc.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/nvgpu_mem.h>
+
+#include "gk20a/gk20a.h"
+#include "gk20a/gr_gk20a.h"
+
+int nvgpu_ltc_alloc_cbc(struct gk20a *g, size_t compbit_backing_size)
+{
+	struct gr_gk20a *gr = &g->gr;
+	unsigned long flags = 0;
+
+	if (nvgpu_mem_is_valid(&gr->compbit_store.mem))
+		return 0;
+
+	if (!nvgpu_iommuable(g))
+		flags = NVGPU_DMA_FORCE_CONTIGUOUS;
+
+	return nvgpu_dma_alloc_flags_sys(g,
+					 flags,
+					 compbit_backing_size,
+					 &gr->compbit_store.mem);
+}