accel/ivpu: Initial debugfs support

Add initial debugfs support. Provide below functionality:

- print buffer objects
- print latest boot mode
- trigger vpu engine reset

Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230524074847.866711-2-stanislaw.gruszka@linux.intel.com

drivers/accel/ivpu/Makefile

@@ -2,6 +2,7 @@
 # Copyright (C) 2023 Intel Corporation
 
 intel_vpu-y := \
+	ivpu_debugfs.o \
 	ivpu_drv.o \
 	ivpu_fw.o \
 	ivpu_gem.o \

drivers/accel/ivpu/ivpu_debugfs.c

@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020-2023 Intel Corporation
+ */
+
+#include <drm/drm_debugfs.h>
+#include <drm/drm_file.h>
+#include <drm/drm_print.h>
+
+#include <uapi/drm/ivpu_accel.h>
+
+#include "ivpu_debugfs.h"
+#include "ivpu_drv.h"
+#include "ivpu_gem.h"
+#include "ivpu_jsm_msg.h"
+#include "ivpu_pm.h"
+
+static int bo_list_show(struct seq_file *s, void *v)
+{
+	struct drm_info_node *node = (struct drm_info_node *)s->private;
+	struct drm_printer p = drm_seq_file_printer(s);
+
+	ivpu_bo_list(node->minor->dev, &p);
+
+	return 0;
+}
+
+static int last_bootmode_show(struct seq_file *s, void *v)
+{
+	struct drm_info_node *node = (struct drm_info_node *)s->private;
+	struct ivpu_device *vdev = to_ivpu_device(node->minor->dev);
+
+	seq_printf(s, "%s\n", (vdev->pm->is_warmboot) ? "warmboot" : "coldboot");
+
+	return 0;
+}
+
+static const struct drm_info_list vdev_debugfs_list[] = {
+	{"bo_list", bo_list_show, 0},
+	{"last_bootmode", last_bootmode_show, 0},
+};
+
+static ssize_t
+ivpu_reset_engine_fn(struct file *file, const char __user *user_buf, size_t size, loff_t *pos)
+{
+	struct ivpu_device *vdev = file->private_data;
+
+	if (!size)
+		return -EINVAL;
+
+	if (ivpu_jsm_reset_engine(vdev, DRM_IVPU_ENGINE_COMPUTE))
+		return -ENODEV;
+	if (ivpu_jsm_reset_engine(vdev, DRM_IVPU_ENGINE_COPY))
+		return -ENODEV;
+
+	return size;
+}
+
+static const struct file_operations ivpu_reset_engine_fops = {
+	.owner = THIS_MODULE,
+	.open = simple_open,
+	.write = ivpu_reset_engine_fn,
+};
+
+void ivpu_debugfs_init(struct drm_minor *minor)
+{
+	struct ivpu_device *vdev = to_ivpu_device(minor->dev);
+
+	drm_debugfs_create_files(vdev_debugfs_list, ARRAY_SIZE(vdev_debugfs_list),
+				 minor->debugfs_root, minor);
+
+	debugfs_create_file("reset_engine", 0200, minor->debugfs_root, vdev,
+			    &ivpu_reset_engine_fops);
+}

drivers/accel/ivpu/ivpu_debugfs.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020-2023 Intel Corporation
+ */
+
+#ifndef __IVPU_DEBUGFS_H__
+#define __IVPU_DEBUGFS_H__
+
+struct drm_minor;
+
+void ivpu_debugfs_init(struct drm_minor *minor);
+
+#endif /* __IVPU_DEBUGFS_H__ */

drivers/accel/ivpu/ivpu_drv.c

@@ -14,6 +14,7 @@
 #include <drm/drm_prime.h>
 
 #include "vpu_boot_api.h"
+#include "ivpu_debugfs.h"
 #include "ivpu_drv.h"
 #include "ivpu_fw.h"
 #include "ivpu_gem.h"
@@ -375,6 +376,10 @@ static const struct drm_driver driver = {
 	.postclose = ivpu_postclose,
 	.gem_prime_import = ivpu_gem_prime_import,
 
+#if defined(CONFIG_DEBUG_FS)
+	.debugfs_init = ivpu_debugfs_init,
+#endif
+
 	.ioctls = ivpu_drm_ioctls,
 	.num_ioctls = ARRAY_SIZE(ivpu_drm_ioctls),
 	.fops = &ivpu_fops,