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author | Eric Auger <eric.auger@redhat.com> | 2018-06-29 15:11:01 +0100 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2018-06-29 15:11:01 +0100 |
commit | f963cc26dfd7832b6371c312a817a1950bfe398a (patch) | |
tree | 48376d69c0179a572cb4f528ba2d2a4a3e36c469 | |
parent | 38754e43f605be90f0603631f257b3bc2d115126 (diff) | |
download | qemu-f963cc26dfd7832b6371c312a817a1950bfe398a.zip qemu-f963cc26dfd7832b6371c312a817a1950bfe398a.tar.gz qemu-f963cc26dfd7832b6371c312a817a1950bfe398a.tar.bz2 |
device_tree: Add qemu_fdt_node_unit_path
This helper allows to retrieve the paths of nodes whose name
match node-name or node-name@unit-address patterns.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-id: 1530044492-24921-2-git-send-email-eric.auger@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r-- | device_tree.c | 55 | ||||
-rw-r--r-- | include/sysemu/device_tree.h | 16 |
2 files changed, 71 insertions, 0 deletions
diff --git a/device_tree.c b/device_tree.c index 3553819..6d9c972 100644 --- a/device_tree.c +++ b/device_tree.c @@ -232,6 +232,61 @@ static int findnode_nofail(void *fdt, const char *node_path) 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, char *compat, Error **errp) { diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h index e22e5be..c16fd69 100644 --- a/include/sysemu/device_tree.h +++ b/include/sysemu/device_tree.h @@ -43,6 +43,22 @@ void *load_device_tree_from_sysfs(void); char **qemu_fdt_node_path(void *fdt, const char *name, char *compat, Error **errp); +/** + * qemu_fdt_node_unit_path: return the paths of nodes matching a given + * node-name, ie. node-name and node-name@unit-address + * @fdt: pointer to the dt blob + * @name: node name + * @errp: handle to an error object + * + * returns a newly allocated NULL-terminated array of node paths. + * Use g_strfreev() to free it. If one or more nodes were found, the + * array contains the path of each node and the last element equals to + * NULL. If there is no error but no matching node was found, the + * returned array contains a single element equal to NULL. If an error + * was encountered when parsing the blob, the function returns NULL + */ +char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp); + int qemu_fdt_setprop(void *fdt, const char *node_path, const char *property, const void *val, int size); int qemu_fdt_setprop_cell(void *fdt, const char *node_path, |