accel/ivpu: Add dvfs_mode file to debugfs

Add new debugfs file to set dvfs_mode FW boot parameter and restart
the FW to allow experimenting with DVFS (dynamic voltage & frequency
scaling).
Signed-off-by: Tomasz Rusinowicz <tomasz.rusinowicz@intel.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231028133415.1169975-4-stanislaw.gruszka@linux.intel.com

drivers/accel/ivpu/ivpu_debugfs.c

@@ -115,6 +115,31 @@ static const struct drm_debugfs_info vdev_debugfs_list[] = {
 	{"reset_pending", reset_pending_show, 0},
 };
 
+static ssize_t
+dvfs_mode_fops_write(struct file *file, const char __user *user_buf, size_t size, loff_t *pos)
+{
+	struct ivpu_device *vdev = file->private_data;
+	struct ivpu_fw_info *fw = vdev->fw;
+	u32 dvfs_mode;
+	int ret;
+
+	ret = kstrtou32_from_user(user_buf, size, 0, &dvfs_mode);
+	if (ret < 0)
+		return ret;
+
+	fw->dvfs_mode = dvfs_mode;
+
+	ivpu_pm_schedule_recovery(vdev);
+
+	return size;
+}
+
+static const struct file_operations dvfs_mode_fops = {
+	.owner = THIS_MODULE,
+	.open = simple_open,
+	.write = dvfs_mode_fops_write,
+};
+
 static int fw_log_show(struct seq_file *s, void *v)
 {
 	struct ivpu_device *vdev = s->private;
@@ -280,6 +305,9 @@ void ivpu_debugfs_init(struct ivpu_device *vdev)
 	debugfs_create_file("force_recovery", 0200, debugfs_root, vdev,
 			    &ivpu_force_recovery_fops);
 
+	debugfs_create_file("dvfs_mode", 0200, debugfs_root, vdev,
+			    &dvfs_mode_fops);
+
 	debugfs_create_file("fw_log", 0644, debugfs_root, vdev,
 			    &fw_log_fops);
 	debugfs_create_file("fw_trace_destination_mask", 0200, debugfs_root, vdev,

drivers/accel/ivpu/ivpu_fw.c

@@ -182,6 +182,8 @@ static int ivpu_fw_parse(struct ivpu_device *vdev)
 	fw->trace_destination_mask = VPU_TRACE_DESTINATION_VERBOSE_TRACING;
 	fw->trace_hw_component_mask = -1;
 
+	fw->dvfs_mode = 0;
+
 	ivpu_dbg(vdev, FW_BOOT, "Size: file %lu image %u runtime %u shavenn %u\n",
 		 fw->file->size, fw->image_size, fw->runtime_size, fw->shave_nn_size);
 	ivpu_dbg(vdev, FW_BOOT, "Address: runtime 0x%llx, load 0x%llx, entry point 0x%llx\n",
@@ -422,6 +424,8 @@ static void ivpu_fw_boot_params_print(struct ivpu_device *vdev, struct vpu_boot_
 		 boot_params->punit_telemetry_sram_size);
 	ivpu_dbg(vdev, FW_BOOT, "boot_params.vpu_telemetry_enable = 0x%x\n",
 		 boot_params->vpu_telemetry_enable);
+	ivpu_dbg(vdev, FW_BOOT, "boot_params.dvfs_mode = %u\n",
+		 boot_params->dvfs_mode);
 }
 
 void ivpu_fw_boot_params_setup(struct ivpu_device *vdev, struct vpu_boot_params *boot_params)
@@ -492,6 +496,7 @@ void ivpu_fw_boot_params_setup(struct ivpu_device *vdev, struct vpu_boot_params
 	boot_params->punit_telemetry_sram_base = ivpu_hw_reg_telemetry_offset_get(vdev);
 	boot_params->punit_telemetry_sram_size = ivpu_hw_reg_telemetry_size_get(vdev);
 	boot_params->vpu_telemetry_enable = ivpu_hw_reg_telemetry_enable_get(vdev);
+	boot_params->dvfs_mode = vdev->fw->dvfs_mode;
 
 	wmb(); /* Flush WC buffers after writing bootparams */
 

drivers/accel/ivpu/ivpu_fw.h

@@ -27,6 +27,7 @@ struct ivpu_fw_info {
 	u32 trace_level;
 	u32 trace_destination_mask;
 	u64 trace_hw_component_mask;
+	u32 dvfs_mode;
 };
 
 int ivpu_fw_init(struct ivpu_device *vdev);