[PATCH v2 5/7] drm/xe/pf: Expose basic info about VFs in debugfs

[Michal Wajdeczko]

We already have function to print summary about VFs, but we missed
to add debugfs attribute to make it visible. Do it now.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski at intel.com>
---
v2: don't WARN on missed mandatory print func (Piotr)
---
 drivers/gpu/drm/xe/xe_debugfs.c  |  4 +++
 drivers/gpu/drm/xe/xe_sriov_pf.c | 43 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_sriov_pf.h |  6 +++++
 3 files changed, 53 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index d83cd6ed3fa8..24a5f99ed52f 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -20,6 +20,7 @@
 #include "xe_pm.h"
 #include "xe_pxp_debugfs.h"
 #include "xe_sriov.h"
+#include "xe_sriov_pf.h"
 #include "xe_step.h"
 
 #ifdef CONFIG_DRM_XE_DEBUG
@@ -273,4 +274,7 @@ void xe_debugfs_register(struct xe_device *xe)
 	xe_pxp_debugfs_register(xe->pxp);
 
 	fault_create_debugfs_attr("fail_gt_reset", root, &gt_reset_failure);
+
+	if (IS_SRIOV_PF(xe))
+		xe_sriov_pf_debugfs_register(xe, root);
 }
diff --git a/drivers/gpu/drm/xe/xe_sriov_pf.c b/drivers/gpu/drm/xe/xe_sriov_pf.c
index 0f721ae17b26..331755843e10 100644
--- a/drivers/gpu/drm/xe/xe_sriov_pf.c
+++ b/drivers/gpu/drm/xe/xe_sriov_pf.c
@@ -3,6 +3,8 @@
  * Copyright © 2023-2024 Intel Corporation
  */
 
+#include <linux/debugfs.h>
+#include <drm/drm_debugfs.h>
 #include <drm/drm_managed.h>
 
 #include "xe_assert.h"
@@ -102,3 +104,44 @@ void xe_sriov_pf_print_vfs_summary(struct xe_device *xe, struct drm_printer *p)
 	drm_printf(p, "supported: %u\n", xe->sriov.pf.driver_max_vfs);
 	drm_printf(p, "enabled: %u\n", pci_num_vf(pdev));
 }
+
+static int simple_show(struct seq_file *m, void *data)
+{
+	struct drm_printer p = drm_seq_file_printer(m);
+	struct drm_info_node *node = m->private;
+	struct dentry *parent = node->dent->d_parent;
+	struct xe_device *xe = parent->d_inode->i_private;
+	void (*print)(struct xe_device *, struct drm_printer *) = node->info_ent->data;
+
+	print(xe, &p);
+	return 0;
+}
+
+static const struct drm_info_list debugfs_list[] = {
+	{ .name = "vfs", .show = simple_show, .data = xe_sriov_pf_print_vfs_summary },
+};
+
+/**
+ * xe_sriov_pf_debugfs_register - Register PF debugfs attributes.
+ * @xe: the &xe_device
+ * @root: the root &dentry
+ *
+ * Prepare debugfs attributes exposed by the PF.
+ */
+void xe_sriov_pf_debugfs_register(struct xe_device *xe, struct dentry *root)
+{
+	struct drm_minor *minor = xe->drm.primary;
+	struct dentry *parent;
+
+	/*
+	 *      /sys/kernel/debug/dri/0/
+	 *      ├── pf
+	 *      │   ├── ...
+	 */
+	parent = debugfs_create_dir("pf", root);
+	if (IS_ERR(parent))
+		return;
+	parent->d_inode->i_private = xe;
+
+	drm_debugfs_create_files(debugfs_list, ARRAY_SIZE(debugfs_list), parent, minor);
+}
diff --git a/drivers/gpu/drm/xe/xe_sriov_pf.h b/drivers/gpu/drm/xe/xe_sriov_pf.h
index d1220e70e1c0..c392c3fcf085 100644
--- a/drivers/gpu/drm/xe/xe_sriov_pf.h
+++ b/drivers/gpu/drm/xe/xe_sriov_pf.h
@@ -8,12 +8,14 @@
 
 #include <linux/types.h>
 
+struct dentry;
 struct drm_printer;
 struct xe_device;
 
 #ifdef CONFIG_PCI_IOV
 bool xe_sriov_pf_readiness(struct xe_device *xe);
 int xe_sriov_pf_init_early(struct xe_device *xe);
+void xe_sriov_pf_debugfs_register(struct xe_device *xe, struct dentry *root);
 void xe_sriov_pf_print_vfs_summary(struct xe_device *xe, struct drm_printer *p);
 #else
 static inline bool xe_sriov_pf_readiness(struct xe_device *xe)
@@ -25,6 +27,10 @@ static inline int xe_sriov_pf_init_early(struct xe_device *xe)
 {
 	return 0;
 }
+
+static inline void xe_sriov_pf_debugfs_register(struct xe_device *xe, struct dentry *root)
+{
+}
 #endif
 
 #endif
-- 
2.47.1