From: Tomasz Rusinowicz <tomasz.rusinowicz@xxxxxxxxx>
The driver tracks the time spent by NPU executing jobs
and shares it through sysfs `npu_busy_time_us` file.
It can be then used by user space applications to monitor device
utilization.
NPU is considered 'busy' starting with a first job submitted
to firmware and ending when there is no more jobs pending/executing.
Signed-off-by: Tomasz Rusinowicz <tomasz.rusinowicz@xxxxxxxxx>
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@xxxxxxxxxxxxxxx>
---
drivers/accel/ivpu/Makefile | 3 +-
drivers/accel/ivpu/ivpu_drv.c | 2 ++
drivers/accel/ivpu/ivpu_drv.h | 3 ++
drivers/accel/ivpu/ivpu_job.c | 23 ++++++++++++-
drivers/accel/ivpu/ivpu_sysfs.c | 58 +++++++++++++++++++++++++++++++++
drivers/accel/ivpu/ivpu_sysfs.h | 13 ++++++++
6 files changed, 100 insertions(+), 2 deletions(-)
create mode 100644 drivers/accel/ivpu/ivpu_sysfs.c
create mode 100644 drivers/accel/ivpu/ivpu_sysfs.h
diff --git a/drivers/accel/ivpu/Makefile b/drivers/accel/ivpu/Makefile
index 1c67a73cfefe..e16a9f5c1c89 100644
--- a/drivers/accel/ivpu/Makefile
+++ b/drivers/accel/ivpu/Makefile
@@ -14,7 +14,8 @@ intel_vpu-y := \
ivpu_mmu.o \
ivpu_mmu_context.o \
ivpu_ms.o \
- ivpu_pm.o
+ ivpu_pm.o \
+ ivpu_sysfs.o
intel_vpu-$(CONFIG_DEBUG_FS) += ivpu_debugfs.o
diff --git a/drivers/accel/ivpu/ivpu_drv.c b/drivers/accel/ivpu/ivpu_drv.c
index bd702401216c..130455d39841 100644
--- a/drivers/accel/ivpu/ivpu_drv.c
+++ b/drivers/accel/ivpu/ivpu_drv.c
@@ -28,6 +28,7 @@
#include "ivpu_mmu_context.h"
#include "ivpu_ms.h"
#include "ivpu_pm.h"
+#include "ivpu_sysfs.h"
#ifndef DRIVER_VERSION_STR
#define DRIVER_VERSION_STR __stringify(DRM_IVPU_DRIVER_MAJOR) "." \
@@ -696,6 +697,7 @@ static int ivpu_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return ret;
ivpu_debugfs_init(vdev);
+ ivpu_sysfs_init(vdev);
ret = drm_dev_register(&vdev->drm, 0);
if (ret) {
diff --git a/drivers/accel/ivpu/ivpu_drv.h b/drivers/accel/ivpu/ivpu_drv.h
index 973f8ded23e9..4de7fc0c7026 100644
--- a/drivers/accel/ivpu/ivpu_drv.h
+++ b/drivers/accel/ivpu/ivpu_drv.h
@@ -135,6 +135,9 @@ struct ivpu_device {
atomic64_t unique_id_counter;
+ ktime_t busy_start_ts;
+ ktime_t busy_time;
+
struct {
int boot;
int jsm;
diff --git a/drivers/accel/ivpu/ivpu_job.c b/drivers/accel/ivpu/ivpu_job.c
index 1d7b4388eb3b..845181b48b3a 100644
--- a/drivers/accel/ivpu/ivpu_job.c
+++ b/drivers/accel/ivpu/ivpu_job.c
@@ -438,11 +438,28 @@ ivpu_job_create(struct ivpu_file_priv *file_priv, u32 engine_idx, u32 bo_count)
return NULL;
}
+static struct ivpu_job *ivpu_job_remove_from_submitted_jobs(struct ivpu_device *vdev, u32 job_id)
+{
+ struct ivpu_job *job;
+
+ xa_lock(&vdev->submitted_jobs_xa);
+ job = __xa_erase(&vdev->submitted_jobs_xa, job_id);
+
+ if (xa_empty(&vdev->submitted_jobs_xa) && job) {
+ vdev->busy_time = ktime_add(ktime_sub(ktime_get(), vdev->busy_start_ts),
+ vdev->busy_time);
+ }
+
+ xa_unlock(&vdev->submitted_jobs_xa);
+
+ return job;
+}
+
static int ivpu_job_signal_and_destroy(struct ivpu_device *vdev, u32 job_id, u32 job_status)
{
struct ivpu_job *job;
- job = xa_erase(&vdev->submitted_jobs_xa, job_id);
+ job = ivpu_job_remove_from_submitted_jobs(vdev, job_id);
if (!job)
return -ENOENT;
@@ -477,6 +494,7 @@ static int ivpu_job_submit(struct ivpu_job *job, u8 priority)
struct ivpu_device *vdev = job->vdev;
struct xa_limit job_id_range;
struct ivpu_cmdq *cmdq;
+ bool is_first_job;
int ret;
ret = ivpu_rpm_get(vdev);
@@ -497,6 +515,7 @@ static int ivpu_job_submit(struct ivpu_job *job, u8 priority)
job_id_range.max = job_id_range.min | JOB_ID_JOB_MASK;
xa_lock(&vdev->submitted_jobs_xa);
+ is_first_job = xa_empty(&vdev->submitted_jobs_xa);
ret = __xa_alloc(&vdev->submitted_jobs_xa, &job->job_id, job, job_id_range, GFP_KERNEL);
if (ret) {
ivpu_dbg(vdev, JOB, "Too many active jobs in ctx %d\n",
@@ -516,6 +535,8 @@ static int ivpu_job_submit(struct ivpu_job *job, u8 priority)
wmb(); /* Flush WC buffer for jobq header */
} else {
ivpu_cmdq_ring_db(vdev, cmdq);
+ if (is_first_job)
+ vdev->busy_start_ts = ktime_get();
}
ivpu_dbg(vdev, JOB, "Job submitted: id %3u ctx %2d engine %d prio %d addr 0x%llx next %d\n",
diff --git a/drivers/accel/ivpu/ivpu_sysfs.c b/drivers/accel/ivpu/ivpu_sysfs.c
new file mode 100644
index 000000000000..913669f1786e
--- /dev/null
+++ b/drivers/accel/ivpu/ivpu_sysfs.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2024 Intel Corporation
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+
+#include "ivpu_hw.h"
+#include "ivpu_sysfs.h"
+
+/*
+ * npu_busy_time_us is the time that the device spent executing jobs.
+ * The time is counted when and only when there are jobs submitted to firmware.
+ *
+ * This time can be used to measure the utilization of NPU, either by calculating
+ * npu_busy_time_us difference between two timepoints (i.e. measuring the time
+ * that the NPU was active during some workload) or monitoring utilization percentage
+ * by reading npu_busy_time_us periodically.
+ *
+ * When reading the value periodically, it shouldn't be read too often as it may have
+ * an impact on job submission performance. Recommended period is 1 second.
+ */
+static ssize_t
+npu_busy_time_us_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct drm_device *drm = dev_get_drvdata(dev);
+ struct ivpu_device *vdev = to_ivpu_device(drm);
+ ktime_t total, now = 0;
+
+ xa_lock(&vdev->submitted_jobs_xa);
+ total = vdev->busy_time;
+ if (!xa_empty(&vdev->submitted_jobs_xa))
+ now = ktime_sub(ktime_get(), vdev->busy_start_ts);
+ xa_unlock(&vdev->submitted_jobs_xa);
+
+ return sysfs_emit(buf, "%lld\n", ktime_to_us(ktime_add(total, now)));
+}
+
+static DEVICE_ATTR_RO(npu_busy_time_us);
+
+static struct attribute *ivpu_dev_attrs[] = {
+ &dev_attr_npu_busy_time_us.attr,
+ NULL,
+};
+
+static struct attribute_group ivpu_dev_attr_group = {
+ .attrs = ivpu_dev_attrs,
+};
+
+void ivpu_sysfs_init(struct ivpu_device *vdev)
+{
+ int ret;
+
+ ret = devm_device_add_group(vdev->drm.dev, &ivpu_dev_attr_group);
+ if (ret)
+ ivpu_warn(vdev, "Failed to add group to device, ret %d", ret);
+}
diff --git a/drivers/accel/ivpu/ivpu_sysfs.h b/drivers/accel/ivpu/ivpu_sysfs.h
new file mode 100644
index 000000000000..9836f09b35a3
--- /dev/null
+++ b/drivers/accel/ivpu/ivpu_sysfs.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2024 Intel Corporation
+ */
+
+#ifndef __IVPU_SYSFS_H__
+#define __IVPU_SYSFS_H__
+
+#include "ivpu_drv.h"
+
+void ivpu_sysfs_init(struct ivpu_device *vdev);
+
+#endif /* __IVPU_SYSFS_H__ */
--
2.43.2
