gpu: nvgpu: use mem_desc for semaphores

Replace manual buffer allocation and cpu_va pointer accesses with
gk20a_gmmu_{alloc,free}() and gk20a_mem_{rd,wr}() using a struct
mem_desc in gk20a_semaphore_pool, for buffer aperture flexibility.

JIRA DNVGPU-23

Change-Id: I394c38f407a9da02480bfd35062a892eec242ea3
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1146684
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 10 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/fence_gk20a.c b/drivers/gpu/nvgpu/gk20a/fence_gk20a.c
index 1bda5902..fe38ae57 100644
--- a/drivers/gpu/nvgpu/gk20a/fence_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/fence_gk20a.c
@@ -154,17 +154,9 @@ struct gk20a_fence *gk20a_fence_from_semaphore(
         struct sync_fence *sync_fence = NULL;
 
 #ifdef CONFIG_SYNC
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
         sync_fence = gk20a_sync_fence_create(timeline, semaphore,
-                                             dependency, "f-gk20a-0x%04llx",
-                                             ((uintptr_t)(void *)semaphore->value) &
-                                             0xffff);
-#else
-        sync_fence = gk20a_sync_fence_create(timeline, semaphore,
-                                             dependency, "f-gk20a-0x%04llx",
-                                             ((u64)(void *)semaphore->value) &
-                                             0xffff);
-#endif
+                                             dependency, "f-gk20a-0x%04x",
+                                             semaphore->offset & 0xffff);
         if (!sync_fence)
                 return NULL;
 #endif