mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Dong Aisheng](/assets/img/avatar_default.png)
Since commit 86588296ac
("fdt: Properly handle "no-map" field in the memory region"),
nomap memory is changed to call memblock_mark_nomap() instead of
memblock_remove(). But it only changed the reserved memory with fixed
addr and size case in early_init_dt_reserve_memory_arch(), not
including the dynamical allocation by size case in
early_init_dt_alloc_reserved_memory_arch().
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20210611131153.3731147-2-aisheng.dong@nxp.com
Signed-off-by: Rob Herring <robh@kernel.org>
443 lines
11 KiB
C
443 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Device tree based initialization code for reserved memory.
|
|
*
|
|
* Copyright (c) 2013, 2015 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>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "OF: reserved mem: " fmt
|
|
|
|
#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>
|
|
#include <linux/sort.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/memblock.h>
|
|
|
|
#include "of_private.h"
|
|
|
|
#define MAX_RESERVED_REGIONS 64
|
|
static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
|
|
static int reserved_mem_count;
|
|
|
|
static int __init 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)
|
|
{
|
|
phys_addr_t base;
|
|
|
|
end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
|
|
align = !align ? SMP_CACHE_BYTES : align;
|
|
base = memblock_find_in_range(start, end, size, align);
|
|
if (!base)
|
|
return -ENOMEM;
|
|
|
|
*res_base = base;
|
|
if (nomap)
|
|
return memblock_mark_nomap(base, size);
|
|
|
|
return memblock_reserve(base, size);
|
|
}
|
|
|
|
/*
|
|
* fdt_reserved_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("not enough space for all defined regions.\n");
|
|
return;
|
|
}
|
|
|
|
rmem->fdt_node = node;
|
|
rmem->name = uname;
|
|
rmem->base = base;
|
|
rmem->size = size;
|
|
|
|
reserved_mem_count++;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* __reserved_mem_alloc_size() - allocate reserved memory described by
|
|
* 'size', 'alignment' 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;
|
|
bool 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("invalid size property in '%s' node.\n", uname);
|
|
return -EINVAL;
|
|
}
|
|
size = dt_mem_next_cell(dt_root_size_cells, &prop);
|
|
|
|
prop = of_get_flat_dt_prop(node, "alignment", &len);
|
|
if (prop) {
|
|
if (len != dt_root_addr_cells * sizeof(__be32)) {
|
|
pr_err("invalid alignment property in '%s' node.\n",
|
|
uname);
|
|
return -EINVAL;
|
|
}
|
|
align = dt_mem_next_cell(dt_root_addr_cells, &prop);
|
|
}
|
|
|
|
nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
|
|
|
|
/* Need adjust the alignment to satisfy the CMA requirement */
|
|
if (IS_ENABLED(CONFIG_CMA)
|
|
&& of_flat_dt_is_compatible(node, "shared-dma-pool")
|
|
&& of_get_flat_dt_prop(node, "reusable", NULL)
|
|
&& !nomap) {
|
|
unsigned long order =
|
|
max_t(unsigned long, MAX_ORDER - 1, pageblock_order);
|
|
|
|
align = max(align, (phys_addr_t)PAGE_SIZE << order);
|
|
}
|
|
|
|
prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
|
|
if (prop) {
|
|
|
|
if (len % t_len != 0) {
|
|
pr_err("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("allocated memory for '%s' node: base %pa, size %lu 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("allocated memory for '%s' node: base %pa, size %lu MiB\n",
|
|
uname, &base, (unsigned long)(size / SZ_1M));
|
|
}
|
|
|
|
if (base == 0) {
|
|
pr_info("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");
|
|
|
|
/*
|
|
* __reserved_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;
|
|
int ret = -ENOENT;
|
|
|
|
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;
|
|
|
|
ret = initfn(rmem);
|
|
if (ret == 0) {
|
|
pr_info("initialized node %s, compatible id %s\n",
|
|
rmem->name, compat);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int __init __rmem_cmp(const void *a, const void *b)
|
|
{
|
|
const struct reserved_mem *ra = a, *rb = b;
|
|
|
|
if (ra->base < rb->base)
|
|
return -1;
|
|
|
|
if (ra->base > rb->base)
|
|
return 1;
|
|
|
|
/*
|
|
* Put the dynamic allocations (address == 0, size == 0) before static
|
|
* allocations at address 0x0 so that overlap detection works
|
|
* correctly.
|
|
*/
|
|
if (ra->size < rb->size)
|
|
return -1;
|
|
if (ra->size > rb->size)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __init __rmem_check_for_overlap(void)
|
|
{
|
|
int i;
|
|
|
|
if (reserved_mem_count < 2)
|
|
return;
|
|
|
|
sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
|
|
__rmem_cmp, NULL);
|
|
for (i = 0; i < reserved_mem_count - 1; i++) {
|
|
struct reserved_mem *this, *next;
|
|
|
|
this = &reserved_mem[i];
|
|
next = &reserved_mem[i + 1];
|
|
|
|
if (this->base + this->size > next->base) {
|
|
phys_addr_t this_end, next_end;
|
|
|
|
this_end = this->base + this->size;
|
|
next_end = next->base + next->size;
|
|
pr_err("OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
|
|
this->name, &this->base, &this_end,
|
|
next->name, &next->base, &next_end);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fdt_init_reserved_mem() - allocate and init all saved reserved memory regions
|
|
*/
|
|
void __init fdt_init_reserved_mem(void)
|
|
{
|
|
int i;
|
|
|
|
/* check for overlapping reserved regions */
|
|
__rmem_check_for_overlap();
|
|
|
|
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;
|
|
bool nomap;
|
|
|
|
nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
|
|
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) {
|
|
err = __reserved_mem_init_node(rmem);
|
|
if (err != 0 && err != -ENOENT) {
|
|
pr_info("node %s compatible matching fail\n",
|
|
rmem->name);
|
|
if (nomap)
|
|
memblock_clear_nomap(rmem->base, rmem->size);
|
|
else
|
|
memblock_free(rmem->base, rmem->size);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
struct rmem_assigned_device {
|
|
struct device *dev;
|
|
struct reserved_mem *rmem;
|
|
struct list_head list;
|
|
};
|
|
|
|
static LIST_HEAD(of_rmem_assigned_device_list);
|
|
static DEFINE_MUTEX(of_rmem_assigned_device_mutex);
|
|
|
|
/**
|
|
* of_reserved_mem_device_init_by_idx() - assign reserved memory region to
|
|
* given device
|
|
* @dev: Pointer to the device to configure
|
|
* @np: Pointer to the device_node with 'reserved-memory' property
|
|
* @idx: Index of selected region
|
|
*
|
|
* This function assigns respective DMA-mapping operations based on reserved
|
|
* memory region specified by 'memory-region' property in @np node to the @dev
|
|
* device. When driver needs to use more than one reserved memory region, it
|
|
* should allocate child devices and initialize regions by name for each of
|
|
* child device.
|
|
*
|
|
* Returns error code or zero on success.
|
|
*/
|
|
int of_reserved_mem_device_init_by_idx(struct device *dev,
|
|
struct device_node *np, int idx)
|
|
{
|
|
struct rmem_assigned_device *rd;
|
|
struct device_node *target;
|
|
struct reserved_mem *rmem;
|
|
int ret;
|
|
|
|
if (!np || !dev)
|
|
return -EINVAL;
|
|
|
|
target = of_parse_phandle(np, "memory-region", idx);
|
|
if (!target)
|
|
return -ENODEV;
|
|
|
|
if (!of_device_is_available(target)) {
|
|
of_node_put(target);
|
|
return 0;
|
|
}
|
|
|
|
rmem = __find_rmem(target);
|
|
of_node_put(target);
|
|
|
|
if (!rmem || !rmem->ops || !rmem->ops->device_init)
|
|
return -EINVAL;
|
|
|
|
rd = kmalloc(sizeof(struct rmem_assigned_device), GFP_KERNEL);
|
|
if (!rd)
|
|
return -ENOMEM;
|
|
|
|
ret = rmem->ops->device_init(rmem, dev);
|
|
if (ret == 0) {
|
|
rd->dev = dev;
|
|
rd->rmem = rmem;
|
|
|
|
mutex_lock(&of_rmem_assigned_device_mutex);
|
|
list_add(&rd->list, &of_rmem_assigned_device_list);
|
|
mutex_unlock(&of_rmem_assigned_device_mutex);
|
|
|
|
dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
|
|
} else {
|
|
kfree(rd);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_idx);
|
|
|
|
/**
|
|
* of_reserved_mem_device_init_by_name() - assign named reserved memory region
|
|
* to given device
|
|
* @dev: pointer to the device to configure
|
|
* @np: pointer to the device node with 'memory-region' property
|
|
* @name: name of the selected memory region
|
|
*
|
|
* Returns: 0 on success or a negative error-code on failure.
|
|
*/
|
|
int of_reserved_mem_device_init_by_name(struct device *dev,
|
|
struct device_node *np,
|
|
const char *name)
|
|
{
|
|
int idx = of_property_match_string(np, "memory-region-names", name);
|
|
|
|
return of_reserved_mem_device_init_by_idx(dev, np, idx);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_name);
|
|
|
|
/**
|
|
* of_reserved_mem_device_release() - release reserved memory device structures
|
|
* @dev: Pointer to the device to deconfigure
|
|
*
|
|
* This function releases structures allocated for memory region handling for
|
|
* the given device.
|
|
*/
|
|
void of_reserved_mem_device_release(struct device *dev)
|
|
{
|
|
struct rmem_assigned_device *rd, *tmp;
|
|
LIST_HEAD(release_list);
|
|
|
|
mutex_lock(&of_rmem_assigned_device_mutex);
|
|
list_for_each_entry_safe(rd, tmp, &of_rmem_assigned_device_list, list) {
|
|
if (rd->dev == dev)
|
|
list_move_tail(&rd->list, &release_list);
|
|
}
|
|
mutex_unlock(&of_rmem_assigned_device_mutex);
|
|
|
|
list_for_each_entry_safe(rd, tmp, &release_list, list) {
|
|
if (rd->rmem && rd->rmem->ops && rd->rmem->ops->device_release)
|
|
rd->rmem->ops->device_release(rd->rmem, dev);
|
|
|
|
kfree(rd);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
|
|
|
|
/**
|
|
* of_reserved_mem_lookup() - acquire reserved_mem from a device node
|
|
* @np: node pointer of the desired reserved-memory region
|
|
*
|
|
* This function allows drivers to acquire a reference to the reserved_mem
|
|
* struct based on a device node handle.
|
|
*
|
|
* Returns a reserved_mem reference, or NULL on error.
|
|
*/
|
|
struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
|
|
{
|
|
const char *name;
|
|
int i;
|
|
|
|
if (!np->full_name)
|
|
return NULL;
|
|
|
|
name = kbasename(np->full_name);
|
|
for (i = 0; i < reserved_mem_count; i++)
|
|
if (!strcmp(reserved_mem[i].name, name))
|
|
return &reserved_mem[i];
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_reserved_mem_lookup);
|