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qemu/softmmu/device_tree.c
Alistair Francis 5567fa825a softmmu/device_tree: Fixup local variables shadowing 
Local variables shadowing other local variables or parameters make the
code needlessly hard to understand.  Bugs love to hide in such code.
Evidence: "[PATCH v3 1/7] migration/rdma: Fix save_page method to fail
on polling error".

This patch removes the local variable shadowing. Tested by adding:

    --extra-cflags='-Wshadow=local -Wno-error=shadow=local -Wno-error=shadow=compatible-local'

To configure

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20230925043023.71448-5-alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:20 +02:00

704 lines
18 KiB
C
Raw Blame History

/*
* Functions to help device tree manipulation using libfdt.
* It also provides functions to read entries from device tree proc
* interface.
*
* Copyright 2008 IBM Corporation.
* Authors: Jerone Young <jyoung5@us.ibm.com>
* Hollis Blanchard <hollisb@us.ibm.com>
*
* This work is licensed under the GNU GPL license version 2 or later.
*
*/
#include "qemu/osdep.h"
#ifdef CONFIG_LINUX
#include <dirent.h>
#endif
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "qemu/bswap.h"
#include "qemu/cutils.h"
#include "qemu/guest-random.h"
#include "sysemu/device_tree.h"
#include "hw/loader.h"
#include "hw/boards.h"
#include "qemu/config-file.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qmp/qdict.h"
#include "monitor/hmp.h"
#include <libfdt.h>
#define FDT_MAX_SIZE 0x100000
void *create_device_tree(int *sizep)
{
void *fdt;
int ret;
*sizep = FDT_MAX_SIZE;
fdt = g_malloc0(FDT_MAX_SIZE);
ret = fdt_create(fdt, FDT_MAX_SIZE);
if (ret < 0) {
goto fail;
}
ret = fdt_finish_reservemap(fdt);
if (ret < 0) {
goto fail;
}
ret = fdt_begin_node(fdt, "");
if (ret < 0) {
goto fail;
}
ret = fdt_end_node(fdt);
if (ret < 0) {
goto fail;
}
ret = fdt_finish(fdt);
if (ret < 0) {
goto fail;
}
ret = fdt_open_into(fdt, fdt, *sizep);
if (ret) {
error_report("%s: Unable to copy device tree into memory: %s",
__func__, fdt_strerror(ret));
exit(1);
}
return fdt;
fail:
error_report("%s Couldn't create dt: %s", __func__, fdt_strerror(ret));
exit(1);
}
void *load_device_tree(const char *filename_path, int *sizep)
{
int dt_size;
int dt_file_load_size;
int ret;
void *fdt = NULL;
*sizep = 0;
dt_size = get_image_size(filename_path);
if (dt_size < 0) {
error_report("Unable to get size of device tree file '%s'",
filename_path);
goto fail;
}
if (dt_size > INT_MAX / 2 - 10000) {
error_report("Device tree file '%s' is too large", filename_path);
goto fail;
}
/* Expand to 2x size to give enough room for manipulation. */
dt_size += 10000;
dt_size *= 2;
/* First allocate space in qemu for device tree */
fdt = g_malloc0(dt_size);
dt_file_load_size = load_image_size(filename_path, fdt, dt_size);
if (dt_file_load_size < 0) {
error_report("Unable to open device tree file '%s'",
filename_path);
goto fail;
}
ret = fdt_open_into(fdt, fdt, dt_size);
if (ret) {
error_report("%s: Unable to copy device tree into memory: %s",
__func__, fdt_strerror(ret));
goto fail;
}
/* Check sanity of device tree */
if (fdt_check_header(fdt)) {
error_report("Device tree file loaded into memory is invalid: %s",
filename_path);
goto fail;
}
*sizep = dt_size;
return fdt;
fail:
g_free(fdt);
return NULL;
}
#ifdef CONFIG_LINUX
#define SYSFS_DT_BASEDIR "/proc/device-tree"
/**
* read_fstree: this function is inspired from dtc read_fstree
* @fdt: preallocated fdt blob buffer, to be populated
* @dirname: directory to scan under SYSFS_DT_BASEDIR
* the search is recursive and the tree is searched down to the
* leaves (property files).
*
* the function asserts in case of error
*/
static void read_fstree(void *fdt, const char *dirname)
{
DIR *d;
struct dirent *de;
struct stat st;
const char *root_dir = SYSFS_DT_BASEDIR;
const char *parent_node;
if (strstr(dirname, root_dir) != dirname) {
error_report("%s: %s must be searched within %s",
__func__, dirname, root_dir);
exit(1);
}
parent_node = &dirname[strlen(SYSFS_DT_BASEDIR)];
d = opendir(dirname);
if (!d) {
error_report("%s cannot open %s", __func__, dirname);
exit(1);
}
while ((de = readdir(d)) != NULL) {
char *tmpnam;
if (!g_strcmp0(de->d_name, ".")
|| !g_strcmp0(de->d_name, "..")) {
continue;
}
tmpnam = g_strdup_printf("%s/%s", dirname, de->d_name);
if (lstat(tmpnam, &st) < 0) {
error_report("%s cannot lstat %s", __func__, tmpnam);
exit(1);
}
if (S_ISREG(st.st_mode)) {
gchar *val;
gsize len;
if (!g_file_get_contents(tmpnam, &val, &len, NULL)) {
error_report("%s not able to extract info from %s",
__func__, tmpnam);
exit(1);
}
if (strlen(parent_node) > 0) {
qemu_fdt_setprop(fdt, parent_node,
de->d_name, val, len);
} else {
qemu_fdt_setprop(fdt, "/", de->d_name, val, len);
}
g_free(val);
} else if (S_ISDIR(st.st_mode)) {
char *node_name;
node_name = g_strdup_printf("%s/%s",
parent_node, de->d_name);
qemu_fdt_add_subnode(fdt, node_name);
g_free(node_name);
read_fstree(fdt, tmpnam);
}
g_free(tmpnam);
}
closedir(d);
}
/* load_device_tree_from_sysfs: extract the dt blob from host sysfs */
void *load_device_tree_from_sysfs(void)
{
void *host_fdt;
int host_fdt_size;
host_fdt = create_device_tree(&host_fdt_size);
read_fstree(host_fdt, SYSFS_DT_BASEDIR);
if (fdt_check_header(host_fdt)) {
error_report("%s host device tree extracted into memory is invalid",
__func__);
exit(1);
}
return host_fdt;
}
#endif /* CONFIG_LINUX */
static int findnode_nofail(void *fdt, const char *node_path)
{
int offset;
offset = fdt_path_offset(fdt, node_path);
if (offset < 0) {
error_report("%s Couldn't find node %s: %s", __func__, node_path,
fdt_strerror(offset));
exit(1);
}
return offset;
}
char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp)
{
char *prefix = g_strdup_printf("%s@", name);
unsigned int path_len = 16, n = 0;
GSList *path_list = NULL, *iter;
const char *iter_name;
int offset, len, ret;
char **path_array;
offset = fdt_next_node(fdt, -1, NULL);
while (offset >= 0) {
iter_name = fdt_get_name(fdt, offset, &len);
if (!iter_name) {
offset = len;
break;
}
if (!strcmp(iter_name, name) || g_str_has_prefix(iter_name, prefix)) {
char *path;
path = g_malloc(path_len);
while ((ret = fdt_get_path(fdt, offset, path, path_len))
== -FDT_ERR_NOSPACE) {
path_len += 16;
path = g_realloc(path, path_len);
}
path_list = g_slist_prepend(path_list, path);
n++;
}
offset = fdt_next_node(fdt, offset, NULL);
}
g_free(prefix);
if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
error_setg(errp, "%s: abort parsing dt for %s node units: %s",
__func__, name, fdt_strerror(offset));
for (iter = path_list; iter; iter = iter->next) {
g_free(iter->data);
}
g_slist_free(path_list);
return NULL;
}
path_array = g_new(char *, n + 1);
path_array[n--] = NULL;
for (iter = path_list; iter; iter = iter->next) {
path_array[n--] = iter->data;
}
g_slist_free(path_list);
return path_array;
}
char **qemu_fdt_node_path(void *fdt, const char *name, const char *compat,
Error **errp)
{
int offset, len, ret;
const char *iter_name;
unsigned int path_len = 16, n = 0;
GSList *path_list = NULL, *iter;
char **path_array;
offset = fdt_node_offset_by_compatible(fdt, -1, compat);
while (offset >= 0) {
iter_name = fdt_get_name(fdt, offset, &len);
if (!iter_name) {
offset = len;
break;
}
if (!name || !strcmp(iter_name, name)) {
char *path;
path = g_malloc(path_len);
while ((ret = fdt_get_path(fdt, offset, path, path_len))
== -FDT_ERR_NOSPACE) {
path_len += 16;
path = g_realloc(path, path_len);
}
path_list = g_slist_prepend(path_list, path);
n++;
}
offset = fdt_node_offset_by_compatible(fdt, offset, compat);
}
if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
error_setg(errp, "%s: abort parsing dt for %s/%s: %s",
__func__, name, compat, fdt_strerror(offset));
for (iter = path_list; iter; iter = iter->next) {
g_free(iter->data);
}
g_slist_free(path_list);
return NULL;
}
path_array = g_new(char *, n + 1);
path_array[n--] = NULL;
for (iter = path_list; iter; iter = iter->next) {
path_array[n--] = iter->data;
}
g_slist_free(path_list);
return path_array;
}
int qemu_fdt_setprop(void *fdt, const char *node_path,
const char *property, const void *val, int size)
{
int r;
r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val, size);
if (r < 0) {
error_report("%s: Couldn't set %s/%s: %s", __func__, node_path,
property, fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
const char *property, uint32_t val)
{
int r;
r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
if (r < 0) {
error_report("%s: Couldn't set %s/%s = %#08x: %s", __func__,
node_path, property, val, fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
const char *property, uint64_t val)
{
val = cpu_to_be64(val);
return qemu_fdt_setprop(fdt, node_path, property, &val, sizeof(val));
}
int qemu_fdt_setprop_string(void *fdt, const char *node_path,
const char *property, const char *string)
{
int r;
r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
if (r < 0) {
error_report("%s: Couldn't set %s/%s = %s: %s", __func__,
node_path, property, string, fdt_strerror(r));
exit(1);
}
return r;
}
/*
* libfdt doesn't allow us to add string arrays directly but they are
* test a series of null terminated strings with a length. We build
* the string up here so we can calculate the final length.
*/
int qemu_fdt_setprop_string_array(void *fdt, const char *node_path,
const char *prop, char **array, int len)
{
int ret, i, total_len = 0;
char *str, *p;
for (i = 0; i < len; i++) {
total_len += strlen(array[i]) + 1;
}
p = str = g_malloc0(total_len);
for (i = 0; i < len; i++) {
int offset = strlen(array[i]) + 1;
pstrcpy(p, offset, array[i]);
p += offset;
}
ret = qemu_fdt_setprop(fdt, node_path, prop, str, total_len);
g_free(str);
return ret;
}
const void *qemu_fdt_getprop(void *fdt, const char *node_path,
const char *property, int *lenp, Error **errp)
{
int len;
const void *r;
if (!lenp) {
lenp = &len;
}
r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
if (!r) {
error_setg(errp, "%s: Couldn't get %s/%s: %s", __func__,
node_path, property, fdt_strerror(*lenp));
}
return r;
}
uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
const char *property, int *lenp, Error **errp)
{
int len;
const uint32_t *p;
if (!lenp) {
lenp = &len;
}
p = qemu_fdt_getprop(fdt, node_path, property, lenp, errp);
if (!p) {
return 0;
} else if (*lenp != 4) {
error_setg(errp, "%s: %s/%s not 4 bytes long (not a cell?)",
__func__, node_path, property);
*lenp = -EINVAL;
return 0;
}
return be32_to_cpu(*p);
}
uint32_t qemu_fdt_get_phandle(void *fdt, const char *path)
{
uint32_t r;
r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
if (r == 0) {
error_report("%s: Couldn't get phandle for %s: %s", __func__,
path, fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
const char *property,
const char *target_node_path)
{
uint32_t phandle = qemu_fdt_get_phandle(fdt, target_node_path);
return qemu_fdt_setprop_cell(fdt, node_path, property, phandle);
}
uint32_t qemu_fdt_alloc_phandle(void *fdt)
{
static int phandle = 0x0;
/*
* We need to find out if the user gave us special instruction at
* which phandle id to start allocating phandles.
*/
if (!phandle) {
phandle = machine_phandle_start(current_machine);
}
if (!phandle) {
/*
* None or invalid phandle given on the command line, so fall back to
* default starting point.
*/
phandle = 0x8000;
}
return phandle++;
}
int qemu_fdt_nop_node(void *fdt, const char *node_path)
{
int r;
r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
if (r < 0) {
error_report("%s: Couldn't nop node %s: %s", __func__, node_path,
fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_fdt_add_subnode(void *fdt, const char *name)
{
char *dupname = g_strdup(name);
char *basename = strrchr(dupname, '/');
int retval;
int parent = 0;
if (!basename) {
g_free(dupname);
return -1;
}
basename[0] = '\0';
basename++;
if (dupname[0]) {
parent = findnode_nofail(fdt, dupname);
}
retval = fdt_add_subnode(fdt, parent, basename);
if (retval < 0) {
error_report("%s: Failed to create subnode %s: %s",
__func__, name, fdt_strerror(retval));
exit(1);
}
g_free(dupname);
return retval;
}
/*
* qemu_fdt_add_path: Like qemu_fdt_add_subnode(), but will add
* all missing subnodes from the given path.
*/
int qemu_fdt_add_path(void *fdt, const char *path)
{
const char *name;
int namelen, retval;
int parent = 0;
if (path[0] != '/') {
return -1;
}
do {
name = path + 1;
path = strchr(name, '/');
namelen = path != NULL ? path - name : strlen(name);
retval = fdt_subnode_offset_namelen(fdt, parent, name, namelen);
if (retval < 0 && retval != -FDT_ERR_NOTFOUND) {
error_report("%s: Unexpected error in finding subnode %.*s: %s",
__func__, namelen, name, fdt_strerror(retval));
exit(1);
} else if (retval == -FDT_ERR_NOTFOUND) {
retval = fdt_add_subnode_namelen(fdt, parent, name, namelen);
if (retval < 0) {
error_report("%s: Failed to create subnode %.*s: %s",
__func__, namelen, name, fdt_strerror(retval));
exit(1);
}
}
parent = retval;
} while (path);
return retval;
}
void qemu_fdt_dumpdtb(void *fdt, int size)
{
const char *dumpdtb = current_machine->dumpdtb;
if (dumpdtb) {
/* Dump the dtb to a file and quit */
if (g_file_set_contents(dumpdtb, fdt, size, NULL)) {
info_report("dtb dumped to %s. Exiting.", dumpdtb);
exit(0);
}
error_report("%s: Failed dumping dtb to %s", __func__, dumpdtb);
exit(1);
}
}
int qemu_fdt_setprop_sized_cells_from_array(void *fdt,
const char *node_path,
const char *property,
int numvalues,
uint64_t *values)
{
uint32_t *propcells;
uint64_t value;
int cellnum, vnum, ncells;
uint32_t hival;
int ret;
propcells = g_new0(uint32_t, numvalues * 2);
cellnum = 0;
for (vnum = 0; vnum < numvalues; vnum++) {
ncells = values[vnum * 2];
if (ncells != 1 && ncells != 2) {
ret = -1;
goto out;
}
value = values[vnum * 2 + 1];
hival = cpu_to_be32(value >> 32);
if (ncells > 1) {
propcells[cellnum++] = hival;
} else if (hival != 0) {
ret = -1;
goto out;
}
propcells[cellnum++] = cpu_to_be32(value);
}
ret = qemu_fdt_setprop(fdt, node_path, property, propcells,
cellnum * sizeof(uint32_t));
out:
g_free(propcells);
return ret;
}
void qmp_dumpdtb(const char *filename, Error **errp)
{
g_autoptr(GError) err = NULL;
uint32_t size;
if (!current_machine->fdt) {
error_setg(errp, "This machine doesn't have a FDT");
return;
}
size = fdt_totalsize(current_machine->fdt);
g_assert(size > 0);
if (!g_file_set_contents(filename, current_machine->fdt, size, &err)) {
error_setg(errp, "Error saving FDT to file %s: %s",
filename, err->message);
}
}
void hmp_dumpdtb(Monitor *mon, const QDict *qdict)
{
const char *filename = qdict_get_str(qdict, "filename");
Error *local_err = NULL;
qmp_dumpdtb(filename, &local_err);
if (hmp_handle_error(mon, local_err)) {
return;
}
info_report("dtb dumped to %s", filename);
}
void qemu_fdt_randomize_seeds(void *fdt)
{
int noffset, poffset, len;
const char *name;
uint8_t *data;
for (noffset = fdt_next_node(fdt, 0, NULL);
noffset >= 0;
noffset = fdt_next_node(fdt, noffset, NULL)) {
for (poffset = fdt_first_property_offset(fdt, noffset);
poffset >= 0;
poffset = fdt_next_property_offset(fdt, poffset)) {
data = (uint8_t *)fdt_getprop_by_offset(fdt, poffset, &name, &len);
if (!data || strcmp(name, "rng-seed"))
continue;
qemu_guest_getrandom_nofail(data, len);
}
}
}
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