4.16-stable review patch. If anyone has any objections, please let me know.
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From: Andres Rodriguez andres.rodriguez@amd.com
[ Upstream commit 1cf6cc74bbeb85bb87c3ca3f3df97a283c3aa737 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c @@ -748,12 +748,13 @@ static int kfd_ioctl_get_clock_counters( 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);