drm/msm/gpu: avoid deprecated do_gettimeofday

All users of do_gettimeofday() have been removed, but this one recently
crept in, along with an incorrect printing of the microseconds portion.

This converts it to using ktime_get_real_timespec64() as a direct
replacement, and adds the leading zeroes. I considered using monotonic
times (ktime_get()) instead, but as this timestamp appears to only
be used for humans rather than compared with other timestamps, the
real time domain is probably good enough.

Fixes: e43b045e2c82 ("drm/msm/gpu: Capture the state of the GPU")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -376,7 +376,7 @@ int adreno_gpu_state_get(struct msm_gpu *gpu, struct msm_gpu_state *state)
 
 	kref_init(&state->ref);
 
-	do_gettimeofday(&state->time);
+	ktime_get_real_ts64(&state->time);
 
 	for (i = 0; i < gpu->nr_rings; i++) {
 		int size = 0, j;

drivers/gpu/drm/msm/msm_gpu.c

@@ -297,8 +297,8 @@ static ssize_t msm_gpu_devcoredump_read(char *buffer, loff_t offset,
 	drm_printf(&p, "---\n");
 	drm_printf(&p, "kernel: " UTS_RELEASE "\n");
 	drm_printf(&p, "module: " KBUILD_MODNAME "\n");
-	drm_printf(&p, "time: %ld.%ld\n",
-		state->time.tv_sec, state->time.tv_usec);
+	drm_printf(&p, "time: %lld.%09ld\n",
+		state->time.tv_sec, state->time.tv_nsec);
 	if (state->comm)
 		drm_printf(&p, "comm: %s\n", state->comm);
 	if (state->cmd)

drivers/gpu/drm/msm/msm_gpu.h

@@ -189,7 +189,7 @@ struct msm_gpu_state_bo {
 
 struct msm_gpu_state {
 	struct kref ref;
-	struct timeval time;
+	struct timespec64 time;
 
 	struct {
 		u64 iova;