gpu: nvgpu: Reboot when GPU disappears

Reboot the GPU when it disappears instead of just printing a warning
message.

Bug 1805082
Bug 1816516
Bug 1807277

Change-Id: Ifd23c7e6876d5ea86032a82b7181e31d54e877b5
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1260898
(cherry picked from commit 4fdc48c4e6dddf4299a49f387ac90404dd38950f)
Reviewed-on: http://git-master/r/1261917
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index b921be7c..e314d6cd 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -39,7 +39,7 @@
 #include <linux/kthread.h>
 #include <linux/platform/tegra/common.h>
 #include <linux/reset.h>
-
+#include <linux/reboot.h>
 #include <linux/sched.h>
 #include <linux/version.h>
 
@@ -266,8 +266,11 @@ void __nvgpu_check_gpu_state(struct gk20a *g)
 {
         u32 boot_0 = readl(g->regs + mc_boot_0_r());
 
-        if (boot_0 == 0xffffffff)
+        if (boot_0 == 0xffffffff) {
                 pr_err("nvgpu: GPU has disappeared from bus!!\n");
+                pr_err("nvgpu: Rebooting system!!\n");
+                kernel_restart(NULL);
+        }
 }
 
 static inline void sim_writel(struct gk20a *g, u32 r, u32 v)