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Subject[PATCH 32/83] hsa/radeon: implementing IOCTL for clock counters
Date
From: Evgeny Pinchuk <evgeny.pinchuk@amd.com>

Implemented new IOCTL to query the CPU and GPU clock counters.

Signed-off-by: Evgeny Pinchuk <evgeny.pinchuk@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
---
drivers/gpu/hsa/radeon/kfd_chardev.c | 37 ++++++++++++++++++++++++++++++++++++
include/uapi/linux/kfd_ioctl.h | 9 +++++++++
2 files changed, 46 insertions(+)

diff --git a/drivers/gpu/hsa/radeon/kfd_chardev.c b/drivers/gpu/hsa/radeon/kfd_chardev.c
index ddaf357..d6fa980 100644
--- a/drivers/gpu/hsa/radeon/kfd_chardev.c
+++ b/drivers/gpu/hsa/radeon/kfd_chardev.c
@@ -28,6 +28,7 @@
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <uapi/linux/kfd_ioctl.h>
+#include <linux/time.h>
#include "kfd_priv.h"
#include "kfd_scheduler.h"

@@ -284,6 +285,38 @@ out:
return err;
}

+static long
+kfd_ioctl_get_clock_counters(struct file *filep, struct kfd_process *p, void __user *arg)
+{
+ 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 = radeon_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 = time.tv_nsec;
+
+ get_monotonic_boottime(&time);
+ args.system_clock_counter = time.tv_nsec;
+
+ /* 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;
+}

static long
kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
@@ -312,6 +345,10 @@ kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
err = kfd_ioctl_set_memory_policy(filep, process, (void __user *)arg);
break;

+ case KFD_IOC_GET_CLOCK_COUNTERS:
+ err = kfd_ioctl_get_clock_counters(filep, process, (void __user *)arg);
+ break;
+
default:
dev_err(kfd_device,
"unknown ioctl cmd 0x%x, arg 0x%lx)\n",
diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
index 928e628..5b9517e 100644
--- a/include/uapi/linux/kfd_ioctl.h
+++ b/include/uapi/linux/kfd_ioctl.h
@@ -70,12 +70,21 @@ struct kfd_ioctl_set_memory_policy_args {
uint64_t alternate_aperture_size; /* to KFD */
};

+struct kfd_ioctl_get_clock_counters_args {
+ uint32_t gpu_id; /* to KFD */
+ uint64_t gpu_clock_counter; /* from KFD */
+ uint64_t cpu_clock_counter; /* from KFD */
+ uint64_t system_clock_counter; /* from KFD */
+ uint64_t system_clock_freq; /* from KFD */
+};
+
#define KFD_IOC_MAGIC 'K'

#define KFD_IOC_GET_VERSION _IOR(KFD_IOC_MAGIC, 1, struct kfd_ioctl_get_version_args)
#define KFD_IOC_CREATE_QUEUE _IOWR(KFD_IOC_MAGIC, 2, struct kfd_ioctl_create_queue_args)
#define KFD_IOC_DESTROY_QUEUE _IOWR(KFD_IOC_MAGIC, 3, struct kfd_ioctl_destroy_queue_args)
#define KFD_IOC_SET_MEMORY_POLICY _IOW(KFD_IOC_MAGIC, 4, struct kfd_ioctl_set_memory_policy_args)
+#define KFD_IOC_GET_CLOCK_COUNTERS _IOWR(KFD_IOC_MAGIC, 5, struct kfd_ioctl_get_clock_counters_args)

#pragma pack(pop)

--
1.9.1


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