mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![George G. Davis](/assets/img/avatar_default.png)
Export of_reserved_mem_device_{init,release} so that modules can initialize and release their assigned per-device cma_area. Signed-off-by: George G. Davis <george_davis@mentor.com> [robh: s/EXPORT_SYMBOL/EXPORT_SYMBOL_GPL/] Signed-off-by: Rob Herring <robh@kernel.org>
293 lines
7.4 KiB
C
293 lines
7.4 KiB
C
/*
|
|
* Device tree based initialization code for reserved memory.
|
|
*
|
|
* Copyright (c) 2013, The Linux Foundation. All Rights Reserved.
|
|
* Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com
|
|
* Author: Marek Szyprowski <m.szyprowski@samsung.com>
|
|
* Author: Josh Cartwright <joshc@codeaurora.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License or (at your optional) any later version of the license.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/sizes.h>
|
|
#include <linux/of_reserved_mem.h>
|
|
|
|
#define MAX_RESERVED_REGIONS 16
|
|
static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
|
|
static int reserved_mem_count;
|
|
|
|
#if defined(CONFIG_HAVE_MEMBLOCK)
|
|
#include <linux/memblock.h>
|
|
int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
|
|
phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
|
|
phys_addr_t *res_base)
|
|
{
|
|
/*
|
|
* We use __memblock_alloc_base() because memblock_alloc_base()
|
|
* panic()s on allocation failure.
|
|
*/
|
|
phys_addr_t base = __memblock_alloc_base(size, align, end);
|
|
if (!base)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Check if the allocated region fits in to start..end window
|
|
*/
|
|
if (base < start) {
|
|
memblock_free(base, size);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*res_base = base;
|
|
if (nomap)
|
|
return memblock_remove(base, size);
|
|
return 0;
|
|
}
|
|
#else
|
|
int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
|
|
phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
|
|
phys_addr_t *res_base)
|
|
{
|
|
pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
|
|
size, nomap ? " (nomap)" : "");
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* res_mem_save_node() - save fdt node for second pass initialization
|
|
*/
|
|
void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
|
|
phys_addr_t base, phys_addr_t size)
|
|
{
|
|
struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
|
|
|
|
if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
|
|
pr_err("Reserved memory: not enough space all defined regions.\n");
|
|
return;
|
|
}
|
|
|
|
rmem->fdt_node = node;
|
|
rmem->name = uname;
|
|
rmem->base = base;
|
|
rmem->size = size;
|
|
|
|
reserved_mem_count++;
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'
|
|
* and 'alloc-ranges' properties
|
|
*/
|
|
static int __init __reserved_mem_alloc_size(unsigned long node,
|
|
const char *uname, phys_addr_t *res_base, phys_addr_t *res_size)
|
|
{
|
|
int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
|
|
phys_addr_t start = 0, end = 0;
|
|
phys_addr_t base = 0, align = 0, size;
|
|
int len;
|
|
const __be32 *prop;
|
|
int nomap;
|
|
int ret;
|
|
|
|
prop = of_get_flat_dt_prop(node, "size", &len);
|
|
if (!prop)
|
|
return -EINVAL;
|
|
|
|
if (len != dt_root_size_cells * sizeof(__be32)) {
|
|
pr_err("Reserved memory: invalid size property in '%s' node.\n",
|
|
uname);
|
|
return -EINVAL;
|
|
}
|
|
size = dt_mem_next_cell(dt_root_size_cells, &prop);
|
|
|
|
nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
|
|
|
|
prop = of_get_flat_dt_prop(node, "alignment", &len);
|
|
if (prop) {
|
|
if (len != dt_root_addr_cells * sizeof(__be32)) {
|
|
pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
|
|
uname);
|
|
return -EINVAL;
|
|
}
|
|
align = dt_mem_next_cell(dt_root_addr_cells, &prop);
|
|
}
|
|
|
|
prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
|
|
if (prop) {
|
|
|
|
if (len % t_len != 0) {
|
|
pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
|
|
uname);
|
|
return -EINVAL;
|
|
}
|
|
|
|
base = 0;
|
|
|
|
while (len > 0) {
|
|
start = dt_mem_next_cell(dt_root_addr_cells, &prop);
|
|
end = start + dt_mem_next_cell(dt_root_size_cells,
|
|
&prop);
|
|
|
|
ret = early_init_dt_alloc_reserved_memory_arch(size,
|
|
align, start, end, nomap, &base);
|
|
if (ret == 0) {
|
|
pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
|
|
uname, &base,
|
|
(unsigned long)size / SZ_1M);
|
|
break;
|
|
}
|
|
len -= t_len;
|
|
}
|
|
|
|
} else {
|
|
ret = early_init_dt_alloc_reserved_memory_arch(size, align,
|
|
0, 0, nomap, &base);
|
|
if (ret == 0)
|
|
pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
|
|
uname, &base, (unsigned long)size / SZ_1M);
|
|
}
|
|
|
|
if (base == 0) {
|
|
pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
|
|
uname);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*res_base = base;
|
|
*res_size = size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id __rmem_of_table_sentinel
|
|
__used __section(__reservedmem_of_table_end);
|
|
|
|
/**
|
|
* res_mem_init_node() - call region specific reserved memory init code
|
|
*/
|
|
static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
|
|
{
|
|
extern const struct of_device_id __reservedmem_of_table[];
|
|
const struct of_device_id *i;
|
|
|
|
for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
|
|
reservedmem_of_init_fn initfn = i->data;
|
|
const char *compat = i->compatible;
|
|
|
|
if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
|
|
continue;
|
|
|
|
if (initfn(rmem) == 0) {
|
|
pr_info("Reserved memory: initialized node %s, compatible id %s\n",
|
|
rmem->name, compat);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
/**
|
|
* fdt_init_reserved_mem - allocate and init all saved reserved memory regions
|
|
*/
|
|
void __init fdt_init_reserved_mem(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < reserved_mem_count; i++) {
|
|
struct reserved_mem *rmem = &reserved_mem[i];
|
|
unsigned long node = rmem->fdt_node;
|
|
int len;
|
|
const __be32 *prop;
|
|
int err = 0;
|
|
|
|
prop = of_get_flat_dt_prop(node, "phandle", &len);
|
|
if (!prop)
|
|
prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
|
|
if (prop)
|
|
rmem->phandle = of_read_number(prop, len/4);
|
|
|
|
if (rmem->size == 0)
|
|
err = __reserved_mem_alloc_size(node, rmem->name,
|
|
&rmem->base, &rmem->size);
|
|
if (err == 0)
|
|
__reserved_mem_init_node(rmem);
|
|
}
|
|
}
|
|
|
|
static inline struct reserved_mem *__find_rmem(struct device_node *node)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!node->phandle)
|
|
return NULL;
|
|
|
|
for (i = 0; i < reserved_mem_count; i++)
|
|
if (reserved_mem[i].phandle == node->phandle)
|
|
return &reserved_mem[i];
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* of_reserved_mem_device_init() - assign reserved memory region to given device
|
|
*
|
|
* This function assign memory region pointed by "memory-region" device tree
|
|
* property to the given device.
|
|
*/
|
|
int of_reserved_mem_device_init(struct device *dev)
|
|
{
|
|
struct reserved_mem *rmem;
|
|
struct device_node *np;
|
|
int ret;
|
|
|
|
np = of_parse_phandle(dev->of_node, "memory-region", 0);
|
|
if (!np)
|
|
return -ENODEV;
|
|
|
|
rmem = __find_rmem(np);
|
|
of_node_put(np);
|
|
|
|
if (!rmem || !rmem->ops || !rmem->ops->device_init)
|
|
return -EINVAL;
|
|
|
|
ret = rmem->ops->device_init(rmem, dev);
|
|
if (ret == 0)
|
|
dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_reserved_mem_device_init);
|
|
|
|
/**
|
|
* of_reserved_mem_device_release() - release reserved memory device structures
|
|
*
|
|
* This function releases structures allocated for memory region handling for
|
|
* the given device.
|
|
*/
|
|
void of_reserved_mem_device_release(struct device *dev)
|
|
{
|
|
struct reserved_mem *rmem;
|
|
struct device_node *np;
|
|
|
|
np = of_parse_phandle(dev->of_node, "memory-region", 0);
|
|
if (!np)
|
|
return;
|
|
|
|
rmem = __find_rmem(np);
|
|
of_node_put(np);
|
|
|
|
if (!rmem || !rmem->ops || !rmem->ops->device_release)
|
|
return;
|
|
|
|
rmem->ops->device_release(rmem, dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
|