drm/xe/vf: Expose SR-IOV VF attributes to GT debugfs

For debug purposes we might want to view actual VF configuration
(including GGTT range, LMEM size, number of GuC contexts IDs or
doorbells) and the negotiated ABI versions (with GuC and PF).

Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240516110546.2216-7-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/Makefile

@@ -156,6 +156,7 @@ xe-$(CONFIG_HWMON) += xe_hwmon.o
 # graphics virtualization (SR-IOV) support
 xe-y += \
 	xe_gt_sriov_vf.o \
+	xe_gt_sriov_vf_debugfs.o \
 	xe_guc_relay.o \
 	xe_memirq.o \
 	xe_sriov.o

drivers/gpu/drm/xe/xe_gt_debugfs.c

@@ -16,6 +16,7 @@
 #include "xe_gt.h"
 #include "xe_gt_mcr.h"
 #include "xe_gt_sriov_pf_debugfs.h"
+#include "xe_gt_sriov_vf_debugfs.h"
 #include "xe_gt_topology.h"
 #include "xe_hw_engine.h"
 #include "xe_lrc.h"
@@ -306,4 +307,6 @@ void xe_gt_debugfs_register(struct xe_gt *gt)
 
 	if (IS_SRIOV_PF(xe))
 		xe_gt_sriov_pf_debugfs_register(gt, root);
+	else if (IS_SRIOV_VF(xe))
+		xe_gt_sriov_vf_debugfs_register(gt, root);
 }

drivers/gpu/drm/xe/xe_gt_sriov_vf_debugfs.c

@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023-2024 Intel Corporation
+ */
+
+#include <linux/debugfs.h>
+
+#include <drm/drm_debugfs.h>
+
+#include "xe_gt_debugfs.h"
+#include "xe_gt_sriov_vf.h"
+#include "xe_gt_sriov_vf_debugfs.h"
+#include "xe_gt_types.h"
+#include "xe_sriov.h"
+
+/*
+ *      /sys/kernel/debug/dri/0/
+ *      ├── gt0
+ *      │   ├── vf
+ *      │   │   ├── self_config
+ *      │   │   ├── abi_versions
+ *      │   │   ├── runtime_regs
+ */
+
+static const struct drm_info_list vf_info[] = {
+	{
+		"self_config",
+		.show = xe_gt_debugfs_simple_show,
+		.data = xe_gt_sriov_vf_print_config,
+	},
+	{
+		"abi_versions",
+		.show = xe_gt_debugfs_simple_show,
+		.data = xe_gt_sriov_vf_print_version,
+	},
+#if defined(CONFIG_DRM_XE_DEBUG) || defined(CONFIG_DRM_XE_DEBUG_SRIOV)
+	{
+		"runtime_regs",
+		.show = xe_gt_debugfs_simple_show,
+		.data = xe_gt_sriov_vf_print_runtime,
+	},
+#endif
+};
+
+/**
+ * xe_gt_sriov_vf_debugfs_register - Register SR-IOV VF specific entries in GT debugfs.
+ * @gt: the &xe_gt to register
+ * @root: the &dentry that represents the GT directory
+ *
+ * Register SR-IOV VF entries that are GT related and must be shown under GT debugfs.
+ */
+void xe_gt_sriov_vf_debugfs_register(struct xe_gt *gt, struct dentry *root)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+	struct drm_minor *minor = xe->drm.primary;
+	struct dentry *vfdentry;
+
+	xe_assert(xe, IS_SRIOV_VF(xe));
+	xe_assert(xe, root->d_inode->i_private == gt);
+
+	/*
+	 *      /sys/kernel/debug/dri/0/
+	 *      ├── gt0
+	 *      │   ├── vf
+	 */
+	vfdentry = debugfs_create_dir("vf", root);
+	if (IS_ERR(vfdentry))
+		return;
+	vfdentry->d_inode->i_private = gt;
+
+	drm_debugfs_create_files(vf_info, ARRAY_SIZE(vf_info), vfdentry, minor);
+}

drivers/gpu/drm/xe/xe_gt_sriov_vf_debugfs.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023-2024 Intel Corporation
+ */
+
+#ifndef _XE_GT_SRIOV_VF_DEBUGFS_H_
+#define _XE_GT_SRIOV_VF_DEBUGFS_H_
+
+struct xe_gt;
+struct dentry;
+
+void xe_gt_sriov_vf_debugfs_register(struct xe_gt *gt, struct dentry *root);
+
+#endif