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-rw-r--r--softmmu/device_tree.c579
1 files changed, 579 insertions, 0 deletions
diff --git a/softmmu/device_tree.c b/softmmu/device_tree.c
new file mode 100644
index 0000000000..b335dae707
--- /dev/null
+++ b/softmmu/device_tree.c
@@ -0,0 +1,579 @@
+/*
+ * 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 "sysemu/device_tree.h"
+#include "sysemu/sysemu.h"
+#include "hw/loader.h"
+#include "hw/boards.h"
+#include "qemu/config-file.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("Unable to copy device tree in memory");
+ 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("Unable to copy device tree in memory");
+ 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;
+}
+
+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("FDT: Failed to create subnode %s: %s", name,
+ fdt_strerror(retval));
+ exit(1);
+ }
+
+ g_free(dupname);
+ return retval;
+}
+
+void qemu_fdt_dumpdtb(void *fdt, int size)
+{
+ const char *dumpdtb = qemu_opt_get(qemu_get_machine_opts(), "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;
+}
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