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SubjectRe: [PATCH 32/83] hsa/radeon: implementing IOCTL for clock counters
On Fri, Jul 11, 2014 at 12:53:48AM +0300, Oded Gabbay wrote:
> 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;

Is the GPU clock counter monotonic too ? Even after GPU reset (hard reset
included) what could go wrong if it rolls back ?

> +
> + 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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