// SPDX-License-Identifier: GPL-2.0
/* mdesc.c: Sun4V machine description handling.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/log2.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/memblock.h>
#include <linux/export.h>
#include <linux/refcount.h>
#include <asm/cpudata.h>
#include <asm/hypervisor.h>
#include <asm/mdesc.h>
#include <asm/prom.h>
#include <linux/uaccess.h>
#include <asm/oplib.h>
#include <asm/smp.h>
#include <asm/adi.h>
/* Unlike the OBP device tree, the machine description is a full-on
* DAG. An arbitrary number of ARCs are possible from one
* node to other nodes and thus we can't use the OBP device_node
* data structure to represent these nodes inside of the kernel.
*
* Actually, it isn't even a DAG, because there are back pointers
* which create cycles in the graph.
*
* mdesc_hdr and mdesc_elem describe the layout of the data structure
* we get from the Hypervisor.
*/
struct mdesc_hdr {
u32 version; /* Transport version */
u32 node_sz; /* node block size */
u32 name_sz; /* name block size */
u32 data_sz; /* data block size */
} __attribute__((aligned(16)));
struct mdesc_elem {
u8 tag;
#define MD_LIST_END 0x00
#define MD_NODE 0x4e
#define MD_NODE_END 0x45
#define MD_NOOP 0x20
#define MD_PROP_ARC 0x61
#define MD_PROP_VAL 0x76
#define MD_PROP_STR 0x73
#define MD_PROP_DATA 0x64
u8 name_len;
u16 resv;
u32 name_offset;
union {
struct {
u32 data_len;
u32 data_offset;
} data;
u64 val;
} d;
};
struct mdesc_mem_ops {
struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
void (*free)(struct mdesc_handle *handle);
};
struct mdesc_handle {
struct list_head list;
struct mdesc_mem_ops *mops;
void *self_base;
refcount_t refcnt;
unsigned int handle_size;
struct mdesc_hdr mdesc;
};
typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,
union md_node_info *);
typedef void (*mdesc_node_info_rel_f)(union md_node_info *);
typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);
struct md_node_ops {
char *name;
mdesc_node_info_get_f get_info;
mdesc_node_info_rel_f rel_info;
mdesc_node_match_f node_match;
};
static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
union md_node_info *node_info);
static void rel_vdev_port_node_info(union md_node_info *node_info);
static bool vdev_port_node_match(union md_node_info *a_node_info,
union md_node_info *b_node_info);
static int get_ds_port_node_info(struct mdesc_handle *