gpu: nvgpu: Abstract IO aperture accessors

Add abstraction of IO aperture accessors. Add new functions
gk20a_io_exists() and gk20a_io_valid_reg() to remove dependencies to
aperture fields from common code.

Implement Linux version of the abstraction by moving gk20a_readl()
and gk20a_writel() to new Linux specific io.c. Move the fields
defining IO aperture to nvgpu_os_linux.

Add t19x specific IO aperture initialization functions and add t19x
specific section to nvgpu_os_linux.

JIRA NVGPU-259

Change-Id: I09e79cda60d11a20d1099a9aaa6d2375236e94ce
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1569698
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/pramin.c b/drivers/gpu/nvgpu/common/pramin.c
index b6166f51..9b04d5a3 100644
--- a/drivers/gpu/nvgpu/common/pramin.c
+++ b/drivers/gpu/nvgpu/common/pramin.c
@@ -51,7 +51,7 @@ void nvgpu_pramin_access_batched(struct gk20a *g, struct nvgpu_mem *mem,
          * driver should be refactored to prevent this from happening, but for
          * now it is ok just to ignore the writes
          */
-        if (!g->regs && nvgpu_is_enabled(g, NVGPU_DRIVER_IS_DYING))
+        if (!gk20a_io_exists(g) && nvgpu_is_enabled(g, NVGPU_DRIVER_IS_DYING))
                 return;
 
         alloc = mem->vidmem_alloc;