drm/xe/pf: Remove GuC migration data save/restore from GT debugfs

In upcoming changes, SR-IOV VF migration data will be extended beyond
GuC data and exported to userspace using VFIO interface (with a
vendor-specific variant driver) and a device-level debugfs interface.
Remove the GT-level debugfs.

Reviewed-by: Michal Wajdeczko <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Michał Winiarski <[e-mail]>

drivers/gpu/drm/xe/xe_gt_sriov_pf_debugfs.c

···
 	{ "stop", xe_gt_sriov_pf_control_stop_vf },
 	{ "pause", xe_gt_sriov_pf_control_pause_vf },
 	{ "resume", xe_gt_sriov_pf_control_resume_vf },
-#ifdef CONFIG_DRM_XE_DEBUG_SRIOV
-	{ "restore!", xe_gt_sriov_pf_migration_restore_guc_state },
-#endif
 };
 
 static ssize_t control_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
···
 	.open		= simple_open,
 	.write		= control_write,
 	.read		= control_read,
-	.llseek		= default_llseek,
-};
-
-/*
- *      /sys/kernel/debug/dri/BDF/
- *      ├── sriov
- *      :   ├── vf1
- *          :   ├── tile0
- *              :   ├── gt0
- *                  :   ├── guc_state
- */
-
-static ssize_t guc_state_read(struct file *file, char __user *buf,
-			      size_t count, loff_t *pos)
-{
-	struct dentry *dent = file_dentry(file);
-	struct dentry *parent = dent->d_parent;
-	struct xe_gt *gt = extract_gt(parent);
-	unsigned int vfid = extract_vfid(parent);
-
-	return xe_gt_sriov_pf_migration_read_guc_state(gt, vfid, buf, count, pos);
-}
-
-static ssize_t guc_state_write(struct file *file, const char __user *buf,
-			       size_t count, loff_t *pos)
-{
-	struct dentry *dent = file_dentry(file);
-	struct dentry *parent = dent->d_parent;
-	struct xe_gt *gt = extract_gt(parent);
-	unsigned int vfid = extract_vfid(parent);
-
-	if (*pos)
-		return -EINVAL;
-
-	return xe_gt_sriov_pf_migration_write_guc_state(gt, vfid, buf, count);
-}
-
-static const struct file_operations guc_state_ops = {
-	.owner		= THIS_MODULE,
-	.read		= guc_state_read,
-	.write		= guc_state_write,
 	.llseek		= default_llseek,
 };
 
···
 
 		/* for testing/debugging purposes only! */
 		if (IS_ENABLED(CONFIG_DRM_XE_DEBUG)) {
-			debugfs_create_file("guc_state",
-					    IS_ENABLED(CONFIG_DRM_XE_DEBUG_SRIOV) ? 0600 : 0400,
-					    dent, NULL, &guc_state_ops);
 			debugfs_create_file("config_blob",
 					    IS_ENABLED(CONFIG_DRM_XE_DEBUG_SRIOV) ? 0600 : 0400,
 					    dent, NULL, &config_blob_ops);