drm/amdkfd: fix clock counter retrieval for node without GPU

Currently if a user requests clock counters for a node without a GPU
resource we will always return EINVAL.

Instead if no GPU resource is attached, fill the gpu_clock_counter
argument with zeroes so that we may proceed and return valid CPU
counters.

Signed-off-by: Andres Rodriguez <andres.rodriguez@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index f65e0142d42e..59808a39ecf4 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -749,12 +749,13 @@ static int kfd_ioctl_get_clock_counters(struct file *filep,
         struct timespec64 time;
 
         dev = kfd_device_by_id(args->gpu_id);
-        if (dev == NULL)
-                return -EINVAL;
-
-        /* Reading GPU clock counter from KGD */
-        args->gpu_clock_counter =
-                dev->kfd2kgd->get_gpu_clock_counter(dev->kgd);
+        if (dev)
+                /* Reading GPU clock counter from KGD */
+                args->gpu_clock_counter =
+                        dev->kfd2kgd->get_gpu_clock_counter(dev->kgd);
+        else
+                /* Node without GPU resource */
+                args->gpu_clock_counter = 0;
 
         /* No access to rdtsc. Using raw monotonic time */
         getrawmonotonic64(&time);