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[Qemu-devel] [PULL 08/14] device_tree: introduce qemu_fdt_node_path
From: |
Alex Williamson |
Subject: |
[Qemu-devel] [PULL 08/14] device_tree: introduce qemu_fdt_node_path |
Date: |
Fri, 19 Feb 2016 10:40:17 -0700 |
User-agent: |
StGit/0.17.1-dirty |
From: Eric Auger <address@hidden>
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 <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: Alex Williamson <address@hidden>
---
device_tree.c | 54 ++++++++++++++++++++++++++++++++++++++++++
include/sysemu/device_tree.h | 18 ++++++++++++++
2 files changed, 72 insertions(+)
diff --git a/device_tree.c b/device_tree.c
index 9e77c69..b29a433 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -226,6 +226,60 @@ 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));
+ 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)
{
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,
- [Qemu-devel] [PULL 00/14] VFIO updates 2016-02-19, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 01/14] pcie: modify the capability size assert, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 02/14] vfio: make the 4 bytes aligned for capability size, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 03/14] aer: impove pcie_aer_init to support vfio device, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 04/14] pcie_aer: expose pcie_aer_msg() interface, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 05/14] vfio/pci: replace 1 with PCI_CAP_LIST_NEXT to make code self-explain, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 06/14] hw/vfio/platform: amd-xgbe device, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 07/14] device_tree: introduce load_device_tree_from_sysfs, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 08/14] device_tree: introduce qemu_fdt_node_path,
Alex Williamson <=
- [Qemu-devel] [PULL 09/14] device_tree: qemu_fdt_getprop converted to use the error API, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 10/14] device_tree: qemu_fdt_getprop_cell converted to use the error API, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 13/14] hw/arm/sysbus-fdt: remove qemu_fdt_setprop returned value check, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 14/14] vfio/pci: use PCI_MSIX_FLAGS on retrieving the MSIX entries, Alex Williamson, 2016/02/19
- Re: [Qemu-devel] [PULL 00/14] VFIO updates 2016-02-19, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 12/14] hw/arm/sysbus-fdt: enable amd-xgbe dynamic instantiation, Alex Williamson, 2016/02/19
- [Qemu-devel] [PULL 11/14] hw/arm/sysbus-fdt: helpers for clock node generation, Alex Williamson, 2016/02/19
- Re: [Qemu-devel] [PULL 00/14] VFIO updates 2016-02-19, Peter Maydell, 2016/02/19