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[80.11.198.90]) by smtp.gmail.com with ESMTPSA id lw7sm7925488wjb.19.2016.02.01.05.52.08 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 01 Feb 2016 05:52:09 -0800 (PST) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, alex.williamson@redhat.com, david@gibson.dropbear.id.au Cc: christoffer.dall@linaro.org, suravee.suthikulpanit@amd.com, alex.bennee@linaro.org, thuth@redhat.com, crosthwaitepeter@gmail.com, patches@linaro.org, pbonzini@redhat.com, b.reynal@virtualopensystems.com, thomas.lendacky@amd.com Subject: [PATCH v6 3/8] device_tree: introduce qemu_fdt_node_path Date: Mon, 1 Feb 2016 13:51:47 +0000 Message-Id: <1454334712-12360-4-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1454334712-12360-1-git-send-email-eric.auger@linaro.org> References: <1454334712-12360-1-git-send-email-eric.auger@linaro.org> This new helper routine returns a NULL terminated array of node paths matching a node name and a compat string. Signed-off-by: Eric Auger --- v5 -> v6: - in case of error, free the resources and return NULL - update the doc comment v4 -> v5: - support the case where several nodes exist, ie. return an array of node paths. Also add Error ** parameter v1 -> v2: - move doc comment in header file - do not use a fixed size buffer - break on errors in while loop - use strcmp instead of strncmp RFC -> v1: - improve error handling according to Alex' comments --- device_tree.c | 51 ++++++++++++++++++++++++++++++++++++++++++++ include/sysemu/device_tree.h | 18 ++++++++++++++++ 2 files changed, 69 insertions(+) -- 1.9.1 Reviewed-by: Peter Maydell diff --git a/device_tree.c b/device_tree.c index 3797182..a89b838 100644 --- a/device_tree.c +++ b/device_tree.c @@ -230,6 +230,57 @@ static int findnode_nofail(void *fdt, const char *node_path) 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)); + g_slist_free_full(path_list, g_free); + 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) { diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h index 62093ba..552df21 100644 --- a/include/sysemu/device_tree.h +++ b/include/sysemu/device_tree.h @@ -25,6 +25,24 @@ void *load_device_tree(const char *filename_path, int *sizep); void *load_device_tree_from_sysfs(void); #endif +/** + * qemu_fdt_node_path: return the paths of nodes matching a given + * name and compat string + * @fdt: pointer to the dt blob + * @name: node name + * @compat: compatibility string + * @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_path(void *fdt, const char *name, char *compat, + 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,