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Iglesias" , Ruslan_Ruslichenko@epam.com, Alistair Francis , David Gibson Subject: [PATCH 02/27] system/device_tree: add few parsing and traversal helpers Date: Mon, 26 Jan 2026 18:42:48 +0100 Message-ID: <20260126174313.1418150-3-ruslichenko.r@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260126174313.1418150-1-ruslichenko.r@gmail.com> References: <20260126174313.1418150-1-ruslichenko.r@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42f; envelope-from=ruslichenko.r@gmail.com; helo=mail-wr1-x42f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1769449914343158500 Content-Type: text/plain; charset="utf-8" From: Ruslan Ruslichenko The patch adds few utility functions for parsing FDT nodes. The helpers are required for upcoming Hardware device tree feature. Signed-off-by: Ruslan Ruslichenko --- include/system/device_tree.h | 30 ++++++ system/device_tree.c | 203 +++++++++++++++++++++++++++++++++++ 2 files changed, 233 insertions(+) diff --git a/include/system/device_tree.h b/include/system/device_tree.h index f34b8b7ef9..458dbb74b4 100644 --- a/include/system/device_tree.h +++ b/include/system/device_tree.h @@ -90,6 +90,13 @@ int qemu_fdt_setprop_string_array(void *fdt, const char = *node_path, int qemu_fdt_setprop_phandle(void *fdt, const char *node_path, const char *property, const char *target_node_path); + +uint64_t qemu_fdt_getprop_sized_cell(void *fdt, const char *node_path, + const char *property, int offset, + int size, Error **errp); +const char *qemu_fdt_getprop_string(void *fdt, const char*node_path, + const char *property, int cell, + bool inherit, Error **errp); /** * qemu_fdt_getprop: retrieve the value of a given property * @fdt: pointer to the device tree blob @@ -193,9 +200,32 @@ int qemu_fdt_setprop_sized_cells_from_array(void *fdt, qdt_tmp); \ }) =20 +typedef struct QEMUDevtreeProp { + char *name; + int len; + void *value; +} QEMUDevtreeProp; + +/* node queries */ + +char *qemu_devtree_get_node_name(void *fdt, const char *node_path); +int qemu_devtree_get_num_children(void *fdt, const char *node_path, int de= pth); +char **qemu_devtree_get_children(void *fdt, const char *node_path, int dep= th); +int qemu_devtree_num_props(void *fdt, const char *node_path); +QEMUDevtreeProp *qemu_devtree_get_props(void *fdt, const char *node_path); =20 +/* node getters */ + +int qemu_devtree_get_node_by_name(void *fdt, char *node_path, + const char *cmpname); +int qemu_devtree_get_node_by_phandle(void *fdt, char *node_path, int phand= le); int qemu_devtree_getparent(void *fdt, char *node_path, const char *current); +int qemu_devtree_get_root_node(void *fdt, char *node_path); + +/* misc */ + +int devtree_get_num_nodes(void *fdt); =20 #define DT_PATH_LENGTH 1024 =20 diff --git a/system/device_tree.c b/system/device_tree.c index 41bde0ba5a..7091a4928e 100644 --- a/system/device_tree.c +++ b/system/device_tree.c @@ -451,6 +451,50 @@ const void *qemu_fdt_getprop(void *fdt, const char *no= de_path, return r; } =20 +const char *qemu_fdt_getprop_string(void *fdt, const char*node_path, + const char *property, int cell, + bool inherit, Error **errp) +{ + int len; + const void *prop; + Error *err =3D NULL; + + if (!errp) { + errp =3D &err; + } + + prop =3D qemu_fdt_getprop(fdt, node_path, property, &len, inherit, err= p); + if (*errp) { + return NULL; + } + while (cell) { + void *term =3D memchr(prop, '\0', len); + size_t diff; + + if (!term) { + error_setg(errp, "%s: Couldn't get %s/%s: %s", __func__, + node_path, property, fdt_strerror(len)); + return NULL; + } + diff =3D term - prop + 1; + len -=3D diff; + assert(len >=3D 0); + prop +=3D diff; + cell--; + } + + if (!len) { + return NULL; + } + + if (!*(char *)prop) { + error_setg(errp, "%s: Couldn't get %s/%s: %s", __func__, + node_path, property, fdt_strerror(len)); + return NULL; + } + return prop; +} + uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path, const char *property, int offset, bool inherit, Error **errp) @@ -471,6 +515,22 @@ uint32_t qemu_fdt_getprop_cell(void *fdt, const char *= node_path, return be32_to_cpu(p[offset]); } =20 +uint64_t qemu_fdt_getprop_sized_cell(void *fdt, const char *node_path, + const char *property, int offset, + int size, Error **errp) +{ + uint64_t ret =3D 0; + for (; size; size--) { + ret <<=3D 32; + ret |=3D qemu_fdt_getprop_cell(fdt, node_path, property, offset++,= false, + errp); + if (errp && *errp) { + return 0; + } + } + return ret; +} + uint32_t qemu_fdt_get_phandle(void *fdt, const char *path) { uint32_t r; @@ -638,6 +698,117 @@ out: return ret; } =20 +char *qemu_devtree_get_node_name(void *fdt, const char *node_path) +{ + const char *ret =3D fdt_get_name(fdt, fdt_path_offset(fdt, node_path),= NULL); + return ret ? strdup(ret) : NULL; +} + +int qemu_devtree_num_props(void *fdt, const char *node_path) +{ + int offset =3D fdt_path_offset(fdt, node_path); + int ret =3D 0; + + for (offset =3D fdt_first_property_offset(fdt, offset); + offset !=3D -FDT_ERR_NOTFOUND; + offset =3D fdt_next_property_offset(fdt, offset)) { + ret++; + } + return ret; +} + +QEMUDevtreeProp *qemu_devtree_get_props(void *fdt, const char *node_path) +{ + QEMUDevtreeProp *ret =3D g_new0(QEMUDevtreeProp, + qemu_devtree_num_props(fdt, node_path)= + 1); + int offset =3D fdt_path_offset(fdt, node_path); + int i =3D 0; + + for (offset =3D fdt_first_property_offset(fdt, offset); + offset !=3D -FDT_ERR_NOTFOUND; + offset =3D fdt_next_property_offset(fdt, offset)) { + const char *propname; + const void *val =3D fdt_getprop_by_offset(fdt, offset, &propname, + &ret[i].len); + + ret[i].name =3D g_strdup(propname); + ret[i].value =3D g_memdup2(val, ret[i].len); + i++; + } + return ret; +} + +static void qemu_devtree_children_info(void *fdt, const char *node_path, + int depth, int *num, char **returned_paths) { + int offset =3D fdt_path_offset(fdt, node_path); + int root_depth =3D fdt_node_depth(fdt, offset); + int cur_depth =3D root_depth; + + if (num) { + *num =3D 0; + } + for (;;) { + offset =3D fdt_next_node(fdt, offset, &cur_depth); + if (cur_depth <=3D root_depth) { + break; + } + if (cur_depth <=3D root_depth + depth || depth =3D=3D 0) { + if (returned_paths) { + returned_paths[*num] =3D g_malloc0(DT_PATH_LENGTH); + fdt_get_path(fdt, offset, returned_paths[*num], DT_PATH_LE= NGTH); + } + if (num) { + (*num)++; + } + } + } +} + +char **qemu_devtree_get_children(void *fdt, const char *node_path, int dep= th) +{ + int num_children =3D qemu_devtree_get_num_children(fdt, node_path, dep= th); + char **ret =3D g_malloc0(sizeof(*ret) * num_children); + + qemu_devtree_children_info(fdt, node_path, depth, &num_children, ret); + return ret; +} + +int qemu_devtree_get_num_children(void *fdt, const char *node_path, int de= pth) +{ + int ret; + + qemu_devtree_children_info(fdt, node_path, depth, &ret, NULL); + return ret; +} + +int qemu_devtree_get_node_by_name(void *fdt, char *node_path, + const char *cmpname) { + int offset =3D 0; + char *name =3D NULL; + + do { + char *at; + + offset =3D fdt_next_node(fdt, offset, NULL); + name =3D (void *)fdt_get_name(fdt, offset, NULL); + if (!name) { + continue; + } + at =3D memchr(name, '@', strlen(name)); + if (!strncmp(name, cmpname, at ? at - name : strlen(name))) { + break; + } + } while (offset > 0); + return offset > 0 ? + fdt_get_path(fdt, offset, node_path, DT_PATH_LENGTH) : 1; +} + +int qemu_devtree_get_node_by_phandle(void *fdt, char *node_path, int phand= le) +{ + return fdt_get_path(fdt, fdt_node_offset_by_phandle(fdt, phandle), + node_path, DT_PATH_LENGTH); +} + int qemu_devtree_getparent(void *fdt, char *node_path, const char *current) { int offset =3D fdt_path_offset(fdt, current); @@ -648,6 +819,38 @@ int qemu_devtree_getparent(void *fdt, char *node_path,= const char *current) fdt_get_path(fdt, parent_offset, node_path, DT_PATH_LENGTH) : 1; } =20 +int qemu_devtree_get_root_node(void *fdt, char *node_path) +{ + return fdt_get_path(fdt, 0, node_path, DT_PATH_LENGTH); +} + +static void devtree_scan(void *fdt, int *num_nodes) +{ + int depth =3D 0, offset =3D 0; + + if (num_nodes) { + *num_nodes =3D 0; + } + for (;;) { + offset =3D fdt_next_node(fdt, offset, &depth); + if (num_nodes) { + (*num_nodes)++; + } + if (offset <=3D 0 || depth <=3D 0) { + break; + } + } +} + +int devtree_get_num_nodes(void *fdt) +{ + int ret; + + devtree_scan(fdt, &ret); + return ret; +} + + void qmp_dumpdtb(const char *filename, Error **errp) { ERRP_GUARD(); --=20 2.43.0