accel/ivpu: Show NPU frequency in sysfs

Add sysfs files that show maximum and current
frequency of the NPU's data processing unit.
New sysfs entries:
- npu_max_frequency_mhz
- npu_current_frequency_mhz

Signed-off-by: Andrzej Kacprowski <Andrzej.Kacprowski@intel.com>
Signed-off-by: Maciej Falkowski <maciej.falkowski@linux.intel.com>
Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://lore.kernel.org/r/20250401155912.4049340-3-maciej.falkowski@linux.intel.com

Author: akacprow

drivers/accel/ivpu/ivpu_hw.h

@@ -87,6 +87,11 @@ static inline u32 ivpu_hw_dpu_max_freq_get(struct ivpu_device *vdev)
 	return ivpu_hw_btrs_dpu_max_freq_get(vdev);
 }
 
+static inline u32 ivpu_hw_dpu_freq_get(struct ivpu_device *vdev)
+{
+	return ivpu_hw_btrs_dpu_freq_get(vdev);
+}
+
 static inline void ivpu_hw_irq_clear(struct ivpu_device *vdev)
 {
 	ivpu_hw_ip_irq_clear(vdev);

drivers/accel/ivpu/ivpu_hw_btrs.c

@@ -606,6 +606,14 @@ u32 ivpu_hw_btrs_dpu_max_freq_get(struct ivpu_device *vdev)
 	return pll_ratio_to_dpu_freq(vdev, vdev->hw->pll.max_ratio);
 }
 
+u32 ivpu_hw_btrs_dpu_freq_get(struct ivpu_device *vdev)
+{
+	if (ivpu_hw_btrs_gen(vdev) == IVPU_HW_BTRS_MTL)
+		return pll_ratio_to_dpu_freq_mtl(pll_config_get_mtl(vdev));
+	else
+		return pll_ratio_to_dpu_freq_lnl(pll_config_get_lnl(vdev));
+}
+
 /* Handler for IRQs from Buttress core (irqB) */
 bool ivpu_hw_btrs_irq_handler_mtl(struct ivpu_device *vdev, int irq)
 {

drivers/accel/ivpu/ivpu_hw_btrs.h

@@ -32,6 +32,7 @@ void ivpu_hw_btrs_profiling_freq_reg_set_lnl(struct ivpu_device *vdev);
 void ivpu_hw_btrs_ats_print_lnl(struct ivpu_device *vdev);
 void ivpu_hw_btrs_clock_relinquish_disable_lnl(struct ivpu_device *vdev);
 u32 ivpu_hw_btrs_dpu_max_freq_get(struct ivpu_device *vdev);
+u32 ivpu_hw_btrs_dpu_freq_get(struct ivpu_device *vdev);
 bool ivpu_hw_btrs_irq_handler_mtl(struct ivpu_device *vdev, int irq);
 bool ivpu_hw_btrs_irq_handler_lnl(struct ivpu_device *vdev, int irq);
 int ivpu_hw_btrs_dct_get_request(struct ivpu_device *vdev, bool *enable);

drivers/accel/ivpu/ivpu_sysfs.c

@@ -1,10 +1,12 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (C) 2024 Intel Corporation
+ * Copyright (C) 2024-2025 Intel Corporation
  */
 
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/units.h>
 
 #include "ivpu_drv.h"
 #include "ivpu_gem.h"
@@ -90,10 +92,55 @@ sched_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 
 static DEVICE_ATTR_RO(sched_mode);
 
+/**
+ * DOC: npu_max_frequency
+ *
+ * The npu_max_frequency shows maximum frequency in MHz of the NPU's data
+ * processing unit
+ */
+static ssize_t
+npu_max_frequency_mhz_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);
+	u32 freq = ivpu_hw_dpu_max_freq_get(vdev);
+
+	return sysfs_emit(buf, "%lu\n", freq / HZ_PER_MHZ);
+}
+
+static DEVICE_ATTR_RO(npu_max_frequency_mhz);
+
+/**
+ * DOC: npu_current_frequency_mhz
+ *
+ * The npu_current_frequency_mhz shows current frequency in MHz of the NPU's
+ * data processing unit
+ */
+static ssize_t
+npu_current_frequency_mhz_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);
+	u32 freq = 0;
+
+	/* Read frequency only if device is active, otherwise frequency is 0 */
+	if (pm_runtime_get_if_active(vdev->drm.dev) > 0) {
+		freq = ivpu_hw_dpu_freq_get(vdev);
+
+		pm_runtime_put_autosuspend(vdev->drm.dev);
+	}
+
+	return sysfs_emit(buf, "%lu\n", freq / HZ_PER_MHZ);
+}
+
+static DEVICE_ATTR_RO(npu_current_frequency_mhz);
+
 static struct attribute *ivpu_dev_attrs[] = {
 	&dev_attr_npu_busy_time_us.attr,
 	&dev_attr_npu_memory_utilization.attr,
 	&dev_attr_sched_mode.attr,
+	&dev_attr_npu_max_frequency_mhz.attr,
+	&dev_attr_npu_current_frequency_mhz.attr,
 	NULL,
 };