gpu: nvgpu: ioctl support flags in gpu characteristics

Expose supported nvgpu ioctls to userspace via bits in the flags field
of nvhost_gpu_characteristics; currently define two bits for special
memory allocation support.

Bug 1539747

Change-Id: I1bc9333b12825d07a00b7a4136ae9d35816a5855
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/495942
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index 2ed7b737..7d744f42 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -1907,7 +1907,8 @@ int gk20a_init_gpu_characteristics(struct gk20a *g)
         gpu->compression_page_size = g->mm.compression_page_size;
         gpu->pde_coverage_bit_count = g->mm.pde_stride_shift;
 
-        gpu->flags = 0;
+        gpu->flags = NVHOST_GPU_FLAGS_SUPPORT_PARTIAL_MAPPINGS
+                | NVHOST_GPU_FLAGS_SUPPORT_SPARSE_ALLOCS;
 
         if (IS_ENABLED(CONFIG_TEGRA_GK20A) &&
             gk20a_platform_has_syncpoints(g->dev))
diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
index 9191cfe9..7660c949 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
@@ -3147,9 +3147,12 @@ bool gk20a_mm_mmu_debug_mode_enabled(struct gk20a *g)
 
 void gk20a_init_mm(struct gpu_ops *gops)
 {
+        /* remember to remove NVHOST_GPU_FLAGS_SUPPORT_SPARSE_ALLOCS in
+         * characteristics flags if sparse support is removed */
         gops->mm.set_sparse = gk20a_vm_put_sparse;
         gops->mm.put_empty = gk20a_vm_put_empty;
         gops->mm.clear_sparse = gk20a_vm_clear_sparse;
+
         gops->mm.is_debug_mode_enabled = gk20a_mm_mmu_debug_mode_enabled;
         gops->mm.gmmu_map = gk20a_locked_gmmu_map;
         gops->mm.gmmu_unmap = gk20a_locked_gmmu_unmap;