mirror of https://gitee.com/openkylin/linux.git
233 lines
6.8 KiB
C
233 lines
6.8 KiB
C
/*
|
|
* linux/drivers/firmware/memmap.c
|
|
* Copyright (C) 2008 SUSE LINUX Products GmbH
|
|
* by Bernhard Walle <bernhard.walle@gmx.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License v2.0 as published by
|
|
* the Free Software Foundation
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/string.h>
|
|
#include <linux/firmware-map.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/bootmem.h>
|
|
|
|
/*
|
|
* Data types ------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* Firmware map entry. Because firmware memory maps are flat and not
|
|
* hierarchical, it's ok to organise them in a linked list. No parent
|
|
* information is necessary as for the resource tree.
|
|
*/
|
|
struct firmware_map_entry {
|
|
resource_size_t start; /* start of the memory range */
|
|
resource_size_t end; /* end of the memory range (incl.) */
|
|
const char *type; /* type of the memory range */
|
|
struct list_head list; /* entry for the linked list */
|
|
struct kobject kobj; /* kobject for each entry */
|
|
};
|
|
|
|
/*
|
|
* Forward declarations --------------------------------------------------------
|
|
*/
|
|
static ssize_t memmap_attr_show(struct kobject *kobj,
|
|
struct attribute *attr, char *buf);
|
|
static ssize_t start_show(struct firmware_map_entry *entry, char *buf);
|
|
static ssize_t end_show(struct firmware_map_entry *entry, char *buf);
|
|
static ssize_t type_show(struct firmware_map_entry *entry, char *buf);
|
|
|
|
/*
|
|
* Static data -----------------------------------------------------------------
|
|
*/
|
|
|
|
struct memmap_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct firmware_map_entry *entry, char *buf);
|
|
};
|
|
|
|
static struct memmap_attribute memmap_start_attr = __ATTR_RO(start);
|
|
static struct memmap_attribute memmap_end_attr = __ATTR_RO(end);
|
|
static struct memmap_attribute memmap_type_attr = __ATTR_RO(type);
|
|
|
|
/*
|
|
* These are default attributes that are added for every memmap entry.
|
|
*/
|
|
static struct attribute *def_attrs[] = {
|
|
&memmap_start_attr.attr,
|
|
&memmap_end_attr.attr,
|
|
&memmap_type_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct sysfs_ops memmap_attr_ops = {
|
|
.show = memmap_attr_show,
|
|
};
|
|
|
|
static struct kobj_type memmap_ktype = {
|
|
.sysfs_ops = &memmap_attr_ops,
|
|
.default_attrs = def_attrs,
|
|
};
|
|
|
|
/*
|
|
* Registration functions ------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* Firmware memory map entries. No locking is needed because the
|
|
* firmware_map_add() and firmware_map_add_early() functions are called
|
|
* in firmware initialisation code in one single thread of execution.
|
|
*/
|
|
static LIST_HEAD(map_entries);
|
|
|
|
/**
|
|
* firmware_map_add_entry() - Does the real work to add a firmware memmap entry.
|
|
* @start: Start of the memory range.
|
|
* @end: End of the memory range (inclusive).
|
|
* @type: Type of the memory range.
|
|
* @entry: Pre-allocated (either kmalloc() or bootmem allocator), uninitialised
|
|
* entry.
|
|
*
|
|
* Common implementation of firmware_map_add() and firmware_map_add_early()
|
|
* which expects a pre-allocated struct firmware_map_entry.
|
|
**/
|
|
static int firmware_map_add_entry(resource_size_t start, resource_size_t end,
|
|
const char *type,
|
|
struct firmware_map_entry *entry)
|
|
{
|
|
BUG_ON(start > end);
|
|
|
|
entry->start = start;
|
|
entry->end = end;
|
|
entry->type = type;
|
|
INIT_LIST_HEAD(&entry->list);
|
|
kobject_init(&entry->kobj, &memmap_ktype);
|
|
|
|
list_add_tail(&entry->list, &map_entries);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* firmware_map_add() - Adds a firmware mapping entry.
|
|
* @start: Start of the memory range.
|
|
* @end: End of the memory range (inclusive).
|
|
* @type: Type of the memory range.
|
|
*
|
|
* This function uses kmalloc() for memory
|
|
* allocation. Use firmware_map_add_early() if you want to use the bootmem
|
|
* allocator.
|
|
*
|
|
* That function must be called before late_initcall.
|
|
*
|
|
* Returns 0 on success, or -ENOMEM if no memory could be allocated.
|
|
**/
|
|
int firmware_map_add(resource_size_t start, resource_size_t end,
|
|
const char *type)
|
|
{
|
|
struct firmware_map_entry *entry;
|
|
|
|
entry = kmalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
return firmware_map_add_entry(start, end, type, entry);
|
|
}
|
|
|
|
/**
|
|
* firmware_map_add_early() - Adds a firmware mapping entry.
|
|
* @start: Start of the memory range.
|
|
* @end: End of the memory range (inclusive).
|
|
* @type: Type of the memory range.
|
|
*
|
|
* Adds a firmware mapping entry. This function uses the bootmem allocator
|
|
* for memory allocation. Use firmware_map_add() if you want to use kmalloc().
|
|
*
|
|
* That function must be called before late_initcall.
|
|
*
|
|
* Returns 0 on success, or -ENOMEM if no memory could be allocated.
|
|
**/
|
|
int __init firmware_map_add_early(resource_size_t start, resource_size_t end,
|
|
const char *type)
|
|
{
|
|
struct firmware_map_entry *entry;
|
|
|
|
entry = alloc_bootmem_low(sizeof(struct firmware_map_entry));
|
|
if (WARN_ON(!entry))
|
|
return -ENOMEM;
|
|
|
|
return firmware_map_add_entry(start, end, type, entry);
|
|
}
|
|
|
|
/*
|
|
* Sysfs functions -------------------------------------------------------------
|
|
*/
|
|
|
|
static ssize_t start_show(struct firmware_map_entry *entry, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "0x%llx\n",
|
|
(unsigned long long)entry->start);
|
|
}
|
|
|
|
static ssize_t end_show(struct firmware_map_entry *entry, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "0x%llx\n",
|
|
(unsigned long long)entry->end);
|
|
}
|
|
|
|
static ssize_t type_show(struct firmware_map_entry *entry, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%s\n", entry->type);
|
|
}
|
|
|
|
#define to_memmap_attr(_attr) container_of(_attr, struct memmap_attribute, attr)
|
|
#define to_memmap_entry(obj) container_of(obj, struct firmware_map_entry, kobj)
|
|
|
|
static ssize_t memmap_attr_show(struct kobject *kobj,
|
|
struct attribute *attr, char *buf)
|
|
{
|
|
struct firmware_map_entry *entry = to_memmap_entry(kobj);
|
|
struct memmap_attribute *memmap_attr = to_memmap_attr(attr);
|
|
|
|
return memmap_attr->show(entry, buf);
|
|
}
|
|
|
|
/*
|
|
* Initialises stuff and adds the entries in the map_entries list to
|
|
* sysfs. Important is that firmware_map_add() and firmware_map_add_early()
|
|
* must be called before late_initcall. That's just because that function
|
|
* is called as late_initcall() function, which means that if you call
|
|
* firmware_map_add() or firmware_map_add_early() afterwards, the entries
|
|
* are not added to sysfs.
|
|
*/
|
|
static int __init memmap_init(void)
|
|
{
|
|
int i = 0;
|
|
struct firmware_map_entry *entry;
|
|
struct kset *memmap_kset;
|
|
|
|
memmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj);
|
|
if (WARN_ON(!memmap_kset))
|
|
return -ENOMEM;
|
|
|
|
list_for_each_entry(entry, &map_entries, list) {
|
|
entry->kobj.kset = memmap_kset;
|
|
if (kobject_add(&entry->kobj, NULL, "%d", i++))
|
|
kobject_put(&entry->kobj);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
late_initcall(memmap_init);
|
|
|