gpu: nvgpu: Abstract kernel_restart()

This function is used in gk20a.c to handle catastrophic error conditions
but is Linux specific. As such, implement an abstraction for this in
driver_common.c and expose the API in nvgpu_common.h.

JIRA NVGPU-525

Signed-off-by: Alex Waterman <alexw@nvidia.com>
Change-Id: Ie2e417d30af5ff7db76f4d2d5b97ec96c386bd04
Reviewed-on: https://git-master.nvidia.com/r/1662543
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/linux/driver_common.c

@@ -14,6 +14,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/reboot.h>
 #include <linux/dma-mapping.h>
 #include <linux/mm.h>
 #include <uapi/linux/nvgpu.h>
@@ -37,6 +38,11 @@
 
 #define EMC3D_DEFAULT_RATIO 750
 
+void nvgpu_kernel_restart(void *cmd)
+{
+	kernel_restart(cmd);
+}
+
 static void nvgpu_init_vars(struct gk20a *g)
 {
 	struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);

drivers/gpu/nvgpu/gk20a/gk20a.c

@@ -22,8 +22,6 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
-#include <linux/reboot.h>
-
 #include <nvgpu/nvgpu_common.h>
 #include <nvgpu/kmem.h>
 #include <nvgpu/allocator.h>
@@ -61,7 +59,7 @@ void __nvgpu_check_gpu_state(struct gk20a *g)
 	if (boot_0 == 0xffffffff) {
 		nvgpu_err(g, "GPU has disappeared from bus!!");
 		nvgpu_err(g, "Rebooting system!!");
-		kernel_restart(NULL);
+		nvgpu_kernel_restart(NULL);
 	}
 }
 

drivers/gpu/nvgpu/include/nvgpu/nvgpu_common.h

@@ -31,4 +31,6 @@ int nvgpu_probe(struct gk20a *g,
 		const char *interface_name,
 		struct class *class);
 
+void nvgpu_kernel_restart(void *cmd);
+
 #endif