Release 4.14 drivers/of/of_reserved_mem.c
/*
* 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>
*
* 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.
*/
#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>
#define MAX_RESERVED_REGIONS 32
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)
{
phys_addr_t base;
/*
* We use __memblock_alloc_base() because memblock_alloc_base()
* panic()s on allocation failure.
*/
end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 85 | 85.86% | 1 | 50.00% |
| Vinayak Menon | 14 | 14.14% | 1 | 50.00% |
| Total | 99 | 100.00% | 2 | 100.00% |
#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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 43 | 100.00% | 1 | 100.00% |
| Total | 43 | 100.00% | 1 | 100.00% |
#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("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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 76 | 98.70% | 1 | 50.00% |
| Rob Herring | 1 | 1.30% | 1 | 50.00% |
| Total | 77 | 100.00% | 2 | 100.00% |
/**
* 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("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("invalid alignment property in '%s' node.\n",
uname);
return -EINVAL;
}
align = dt_mem_next_cell(dt_root_addr_cells, &prop);
}
/* 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)
&& !of_get_flat_dt_prop(node, "no-map", NULL)) {
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 %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("allocated memory for '%s' node: base %pa, size %ld 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 383 | 84.18% | 1 | 16.67% |
| Jason Liu | 28 | 6.15% | 1 | 16.67% |
| Jaewon Kim | 19 | 4.18% | 1 | 16.67% |
| Stephen Rothwell | 17 | 3.74% | 1 | 16.67% |
| Rob Herring | 8 | 1.76% | 2 | 33.33% |
| Total | 455 | 100.00% | 6 | 100.00% |
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("initialized node %s, compatible id %s\n",
rmem->name, compat);
return 0;
}
}
return -ENOENT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 96 | 96.97% | 1 | 33.33% |
| Rob Herring | 3 | 3.03% | 2 | 66.67% |
| Total | 99 | 100.00% | 3 | 100.00% |
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;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mitchel Humpherys | 38 | 63.33% | 1 | 50.00% |
| Michael Ellerman | 22 | 36.67% | 1 | 50.00% |
| Total | 60 | 100.00% | 2 | 100.00% |
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 && next->base))
continue;
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);
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mitchel Humpherys | 163 | 98.79% | 1 | 33.33% |
| Michael Ellerman | 1 | 0.61% | 1 | 33.33% |
| Rob Herring | 1 | 0.61% | 1 | 33.33% |
| Total | 165 | 100.00% | 3 | 100.00% |
/**
* 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;
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);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 144 | 97.30% | 3 | 75.00% |
| Mitchel Humpherys | 4 | 2.70% | 1 | 25.00% |
| Total | 148 | 100.00% | 4 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 64 | 100.00% | 1 | 100.00% |
| Total | 64 | 100.00% | 1 | 100.00% |
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;
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);
/* ensure that dma_ops is set for virtual devices
* using reserved memory
*/
of_dma_configure(dev, np);
dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
} else {
kfree(rd);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 201 | 96.17% | 4 | 80.00% |
| Smitha T Murthy | 8 | 3.83% | 1 | 20.00% |
| Total | 209 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_idx);
/**
* 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;
struct reserved_mem *rmem = NULL;
mutex_lock(&of_rmem_assigned_device_mutex);
list_for_each_entry(rd, &of_rmem_assigned_device_list, list) {
if (rd->dev == dev) {
rmem = rd->rmem;
list_del(&rd->list);
kfree(rd);
break;
}
}
mutex_unlock(&of_rmem_assigned_device_mutex);
if (!rmem || !rmem->ops || !rmem->ops->device_release)
return;
rmem->ops->device_release(rmem, dev);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 103 | 100.00% | 2 | 100.00% |
| Total | 103 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Szyprowski | 1296 | 78.83% | 6 | 31.58% |
| Mitchel Humpherys | 209 | 12.71% | 1 | 5.26% |
| Jason Liu | 28 | 1.70% | 1 | 5.26% |
| Michael Ellerman | 23 | 1.40% | 2 | 10.53% |
| Rob Herring | 20 | 1.22% | 3 | 15.79% |
| Jaewon Kim | 19 | 1.16% | 1 | 5.26% |
| Stephen Rothwell | 17 | 1.03% | 1 | 5.26% |
| Vinayak Menon | 14 | 0.85% | 1 | 5.26% |
| George G. Davis | 9 | 0.55% | 1 | 5.26% |
| Smitha T Murthy | 8 | 0.49% | 1 | 5.26% |
| Stewart Smith | 1 | 0.06% | 1 | 5.26% |
| Total | 1644 | 100.00% | 19 | 100.00% |
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