| /* |
| * 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-common.h" |
| #include "qemu/error-report.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 0x10000 |
| |
| 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; |
| } |
| |
| /* 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(filename_path, fdt); |
| 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_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 (qemu_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; |
| |
| 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_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) |
| { |
| 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 */ |
| exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 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; |
| } |
