*
*/
-#include <stdio.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdlib.h>
+#include "qemu/osdep.h"
+#ifdef CONFIG_LINUX
+#include <dirent.h>
+#endif
+
+#include "qapi/error.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "sysemu/device_tree.h"
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_setg(&error_fatal, "%s: %s must be searched within %s",
+ __func__, dirname, root_dir);
+ }
+ parent_node = &dirname[strlen(SYSFS_DT_BASEDIR)];
+
+ d = opendir(dirname);
+ if (!d) {
+ error_setg(&error_fatal, "%s cannot open %s", __func__, dirname);
+ }
+
+ 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_setg(&error_fatal, "%s cannot lstat %s", __func__, tmpnam);
+ }
+
+ if (S_ISREG(st.st_mode)) {
+ gchar *val;
+ gsize len;
+
+ if (!g_file_get_contents(tmpnam, &val, &len, NULL)) {
+ error_setg(&error_fatal, "%s not able to extract info from %s",
+ __func__, tmpnam);
+ }
+
+ 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_setg(&error_fatal,
+ "%s host device tree extracted into memory is invalid",
+ __func__);
+ }
+ return host_fdt;
+}
+
+#endif /* CONFIG_LINUX */
+
static int findnode_nofail(void *fdt, const char *node_path)
{
int offset;
return offset;
}
+char **qemu_fdt_node_path(void *fdt, const char *name, 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 (!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)
{
}
const void *qemu_fdt_getprop(void *fdt, const char *node_path,
- const char *property, int *lenp)
+ 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_report("%s: Couldn't get %s/%s: %s", __func__,
- node_path, property, fdt_strerror(*lenp));
- exit(1);
+ 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)
+ const char *property, int *lenp, Error **errp)
{
int len;
- const uint32_t *p = qemu_fdt_getprop(fdt, node_path, property, &len);
- if (len != 4) {
- error_report("%s: %s/%s not 4 bytes long (not a cell?)",
- __func__, node_path, property);
- exit(1);
+ 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);
}
Code Review / kvmfornfv.git / blobdiff