[PATCH v5 22/24] amdkfd: Implement the Get Clock Counters IOCTL

Oded Gabbay
2014-11-08T18:54:50Z

From: Evgeny Pinchuk <evgeny.pinchuk@amd.com>

Signed-off-by: Evgeny Pinchuk <evgeny.pinchuk@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 1020faf..473f8e1 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -401,7 +401,34 @@ out:
static long kfd_ioctl_get_clock_counters(struct file *filep,
struct kfd_process *p, void __user *arg)
{
- return -ENODEV;
+ struct kfd_ioctl_get_clock_counters_args args;
+ struct kfd_dev *dev;
+ struct timespec time;
+
+ if (copy_from_user(&args, arg, sizeof(args)))
+ return -EFAULT;
+
+ dev = kfd_device_by_id(args.gpu_id);
+ if (dev == NULL)
+ return -EINVAL;
+
+ /* Reading GPU clock counter from KGD */
+ args.gpu_clock_counter = kfd2kgd->get_gpu_clock_counter(dev->kgd);
+
+ /* No access to rdtsc. Using raw monotonic time */
+ getrawmonotonic(&time);
+ args.cpu_clock_counter = (uint64_t)timespec_to_ns(&time);
+
+ get_monotonic_boottime(&time);
+ args.system_clock_counter = (uint64_t)timespec_to_ns(&time);
+
+ /* Since the counter is in nano-seconds we use 1GHz frequency */
+ args.system_clock_freq = 1000000000;
+
+ if (copy_to_user(arg, &args, sizeof(args)))
+ return -EFAULT;
+
+ return 0;
}

--
2.1.0