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

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Date:	Sat, 8 Nov 2014 20:54:31 +0200
From:	Oded Gabbay <oded.gabbay@....com>
To:	David Airlie <airlied@...ux.ie>,
	Alex Deucher <alexander.deucher@....com>,
	Jerome Glisse <j.glisse@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	"John Bridgman" <John.Bridgman@....com>,
	Evgeny Pinchuk <evgeny.pinchuk@....com>,
	Oded Gabbay <oded.gabbay@....com>, Ben Goz <ben.goz@....com>,
	Andrew Lewycky <Andrew.Lewycky@....com>,
	Alexey Skidanov <Alexey.Skidanov@....com>
Subject: [PATCH v5 22/24] amdkfd: Implement the Get Clock Counters IOCTL

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

Signed-off-by: Evgeny Pinchuk <evgeny.pinchuk@....com>
Signed-off-by: Oded Gabbay <oded.gabbay@....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

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