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Iglesias" , Ruslan_Ruslichenko@epam.com, balaton@eik.bme.hu Subject: [PATCH v2 08/33] hw/core/fdt_generic_util: implement fdt_init_qdev Date: Thu, 19 Feb 2026 15:33:07 +0100 Message-ID: <20260219143332.3316679-9-ruslichenko.r@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260219143332.3316679-1-ruslichenko.r@gmail.com> References: <20260219143332.3316679-1-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::42b; envelope-from=ruslichenko.r@gmail.com; helo=mail-wr1-x42b.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: 1771512151006158500 Content-Type: text/plain; charset="utf-8" From: Ruslan Ruslichenko Implement main routine to create device object from compat. The following steps implemented: - parse node compatible and device types - try to create object from compat - set correct parent based on device tree. Signed-off-by: Ruslan Ruslichenko --- hw/core/fdt_generic_util.c | 222 +++++++++++++++++++++++++++++++++++++ 1 file changed, 222 insertions(+) diff --git a/hw/core/fdt_generic_util.c b/hw/core/fdt_generic_util.c index 3606c11349..8131511e70 100644 --- a/hw/core/fdt_generic_util.c +++ b/hw/core/fdt_generic_util.c @@ -40,6 +40,7 @@ #include "qemu/config-file.h" #include "hw/core/boards.h" #include "qemu/option.h" +#include "hw/cpu/cluster.h" =20 #ifndef FDT_GENERIC_UTIL_ERR_DEBUG #define FDT_GENERIC_UTIL_ERR_DEBUG 3 @@ -238,8 +239,229 @@ static int simple_bus_fdt_init(char *node_path, FDTMa= chineInfo *fdti) return 0; } =20 +/* FIXME: figure out a real solution to this */ + +#define DIGIT(a) ((a) >=3D '0' && (a) <=3D '9') +#define LOWER_CASE(a) ((a) >=3D 'a' && (a) <=3D 'z') + +static void trim_version(char *x) +{ + long result; + + for (;;) { + x =3D strchr(x, '-'); + if (!x) { + return; + } + if (DIGIT(x[1])) { + /* Try to trim Xilinx version suffix */ + const char *p; + + qemu_strtol(x + 1, &p, 0, &result); + + if (*p =3D=3D '.') { + *x =3D 0; + return; + } else if (*p =3D=3D 0) { + return; + } + } else if (x[1] =3D=3D 'r' && x[3] =3D=3D 'p') { + /* Try to trim ARM version suffix */ + if (DIGIT(x[2]) && DIGIT(x[4])) { + *x =3D 0; + return; + } + } + x++; + } +} + +static void substitute_char(char *s, char a, char b) +{ + for (;;) { + s =3D strchr(s, a); + if (!s) { + return; + } + *s =3D b; + s++; + } +} + +static inline const char *trim_vendor(const char *s) +{ + /* FIXME: be more intelligent */ + const char *ret =3D memchr(s, ',', strlen(s)); + return ret ? ret + 1 : s; +} + +static Object *fdt_create_from_compat(const char *compat, char **dev_type) +{ + Object *ret =3D NULL; + char *c =3D g_strdup(compat); + + /* Try to create the object */ + ret =3D object_new(c); + + if (!ret) { + /* Trim the version off the end and try again */ + trim_version(c); + ret =3D object_new(c); + + if (!ret) { + /* Replace commas with full stops */ + substitute_char(c, ',', '.'); + ret =3D object_new(c); + } + } + + if (!ret) { + /* + * Restart with the orginal string and now replace commas with full + * stops and try again. This means that versions are still include= d. + */ + g_free(c); + c =3D g_strdup(compat); + substitute_char(c, ',', '.'); + ret =3D object_new(c); + } + + if (dev_type) { + *dev_type =3D c; + } else { + g_free(c); + } + + if (!ret) { + const char *no_vendor =3D trim_vendor(compat); + + if (no_vendor !=3D compat) { + return fdt_create_from_compat(no_vendor, dev_type); + } + } + return ret; +} + +/* + * Error handler for device creation failure. + * + * We look for qemu-fdt-abort-on-error properties up the tree. + * If we find one, we abort with the provided error message. + */ +static void fdt_dev_error(FDTMachineInfo *fdti, char *node_path, char *com= pat) +{ + const char *abort_on_error; + const char *warn_on_error; + + warn_on_error =3D qemu_fdt_getprop_inherited(fdti->fdt, node_path, + "qemu-fdt-warn-on-error", 0, NULL); + abort_on_error =3D qemu_fdt_getprop_inherited(fdti->fdt, node_path, + "qemu-fdt-abort-on-error", 0, NULL); + if (warn_on_error) { + if (strncmp("device_type", compat, strlen("device_type"))) { + warn_report("%s: %s", compat, warn_on_error); + } + } + + if (abort_on_error) { + error_report("Failed to create %s", compat); + error_setg(&error_fatal, "%s", abort_on_error); + } +} + static int fdt_init_qdev(char *node_path, FDTMachineInfo *fdti, char *comp= at) { + Object *dev, *parent; + char *dev_type =3D NULL; + char parent_node_path[DT_PATH_LENGTH]; + + if (!compat) { + return 1; + } + dev =3D fdt_create_from_compat(compat, &dev_type); + if (!dev) { + DB_PRINT_NP(1, "no match found for %s\n", compat); + fdt_dev_error(fdti, node_path, compat); + return 1; + } + DB_PRINT_NP(1, "matched compat %s\n", compat); + + /* Do this super early so fdt_generic_num_cpus is correct ASAP */ + if (object_dynamic_cast(dev, TYPE_CPU)) { + fdt_generic_num_cpus++; + DB_PRINT_NP(0, "is a CPU - total so far %d\n", fdt_generic_num_cpu= s); + } + + if (qemu_devtree_getparent(fdti->fdt, parent_node_path, node_path)) { + abort(); + } + while (!fdt_init_has_opaque(fdti, parent_node_path) && + !object_dynamic_cast(dev, TYPE_CPU)) { + fdt_init_yield(fdti); + } + + parent =3D fdt_init_get_opaque(fdti, parent_node_path); + + if (object_dynamic_cast(dev, TYPE_CPU)) { + parent =3D fdt_init_get_cpu_cluster(fdti, parent, compat); + } + + if (dev->parent) { + DB_PRINT_NP(0, "Node already parented - skipping node\n"); + } else if (parent) { + DB_PRINT_NP(1, "parenting node\n"); + object_property_add_child(OBJECT(parent), + strdup(strrchr(node_path, '/') + 1), + OBJECT(dev)); + if (object_dynamic_cast(dev, TYPE_DEVICE)) { + Object *parent_bus =3D parent; + unsigned int depth =3D 0; + + DB_PRINT_NP(1, "bus parenting node\n"); + /* Look for an FDT ancestor that is a Bus. */ + while (parent_bus && !object_dynamic_cast(parent_bus, TYPE_BUS= )) { + /* + * Assert against insanely deep hierarchies which are an + * indication of loops. + */ + assert(depth < 4096); + + parent_bus =3D parent_bus->parent; + depth++; + } + + if (!parent_bus + && object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE)) { + /* + * Didn't find any bus. Use the default sysbus one. + * This allows ad-hoc busses belonging to sysbus devices t= o be + * visible to -device bus=3Dx. + */ + parent_bus =3D OBJECT(sysbus_get_default()); + } + + if (parent_bus) { + qdev_set_parent_bus(DEVICE(dev), BUS(parent_bus), + &error_abort); + } + } + } else { + DB_PRINT_NP(1, "orphaning node\n"); + if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE)) { + qdev_set_parent_bus(DEVICE(dev), BUS(sysbus_get_default()), + &error_abort); + } + + /* FIXME: Make this go away (centrally) */ + object_property_add_child( + object_get_root(), + strrchr(node_path, '/') + 1, + OBJECT(dev)); + } + fdt_init_set_opaque(fdti, node_path, dev); + + g_free(dev_type); + return 0; } =20 --=20 2.43.0