7  * sysfs (read-only, under "/sys/firmware/qemu_fw_cfg/...").
46 /* fw_cfg revision attribute, in /sys/firmware/qemu_fw_cfg top-level dir. */
80 		u32 ctrl = be32_to_cpu(READ_ONCE(d->control));  in fw_cfg_wait_for_control()
82 		/* do not reorder the read to d->control */  in fw_cfg_wait_for_control()
99 		ret = -ENOMEM;  in fw_cfg_dma_transfer()
119 	if (be32_to_cpu(READ_ONCE(d->control)) & FW_CFG_DMA_CTL_ERROR) {  in fw_cfg_dma_transfer()
120 		ret = -EIO;  in fw_cfg_dma_transfer()
130 /* read chunk of given fw_cfg blob (caller responsible for sanity-check) */
134 	u32 glk = -1U;  in fw_cfg_read_blob()
145 		return -EINVAL;  in fw_cfg_read_blob()
150 	while (pos-- > 0)  in fw_cfg_read_blob()
160 /* write chunk of given fw_cfg blob (caller responsible for sanity-check) */
164 	u32 glk = -1U;  in fw_cfg_write_blob()
175 		return -EINVAL;  in fw_cfg_write_blob()
212 /* arch-specific ctrl & data register offsets are not available in ACPI, DT */
236 	char sig[FW_CFG_SIG_SIZE];  in fw_cfg_do_platform_probe()  local
246 			return -EINVAL;  in fw_cfg_do_platform_probe()
248 	fw_cfg_p_base = range->start;  in fw_cfg_do_platform_probe()
254 			return -EBUSY;  in fw_cfg_do_platform_probe()
258 			return -EFAULT;  in fw_cfg_do_platform_probe()
263 			return -EBUSY;  in fw_cfg_do_platform_probe()
267 			return -EFAULT;  in fw_cfg_do_platform_probe()
276 		fw_cfg_reg_ctrl = fw_cfg_dev_base + ctrl->start;  in fw_cfg_do_platform_probe()
277 		fw_cfg_reg_data = fw_cfg_dev_base + data->start;  in fw_cfg_do_platform_probe()
279 		/* use architecture-specific offsets */  in fw_cfg_do_platform_probe()
285 		fw_cfg_reg_dma = fw_cfg_dev_base + dma->start;  in fw_cfg_do_platform_probe()
292 	if (fw_cfg_read_blob(FW_CFG_SIGNATURE, sig,  in fw_cfg_do_platform_probe()
294 		memcmp(sig, "QEMU", FW_CFG_SIG_SIZE) != 0) {  in fw_cfg_do_platform_probe()
296 		return -ENODEV;  in fw_cfg_do_platform_probe()
330 		return -ENOMEM;  in fw_cfg_write_vmcoreinfo()
338 	 * don't know what else to format - host may ignore ours  in fw_cfg_write_vmcoreinfo()
340 	ret = fw_cfg_write_blob(be16_to_cpu(f->select), data,  in fw_cfg_write_vmcoreinfo()
375 	list_add_tail(&entry->list, &fw_cfg_entry_cache);  in fw_cfg_sysfs_cache_enlist()
382 	list_del(&entry->list);  in fw_cfg_sysfs_cache_delist()
392 		kobject_del(&entry->kobj);  in fw_cfg_sysfs_cache_cleanup()
393 		kobject_put(&entry->kobj);  in fw_cfg_sysfs_cache_cleanup()
397 /* per-entry attributes and show methods */
407 	return sprintf(buf, "%u\n", e->size);  in fw_cfg_sysfs_show_size()
412 	return sprintf(buf, "%u\n", e->select);  in fw_cfg_sysfs_show_key()
417 	return sprintf(buf, "%s\n", e->name);  in fw_cfg_sysfs_show_name()
439 	return attr->show(entry, buf);  in fw_cfg_sysfs_attr_show()
461 /* raw-read method and attribute */
468 	if (pos > entry->size)  in fw_cfg_sysfs_read_raw()
469 		return -EINVAL;  in fw_cfg_sysfs_read_raw()
471 	if (count > entry->size - pos)  in fw_cfg_sysfs_read_raw()
472 		count = entry->size - pos;  in fw_cfg_sysfs_read_raw()
474 	return fw_cfg_read_blob(entry->select, buf, pos, count);  in fw_cfg_sysfs_read_raw()
484  * in 'name', starting with sysfs kset/folder 'dir'; At the end, create
486  * NOTE: We do this on a best-effort basis, since 'name' is not guaranteed
487  * to be a well-behaved path name. Whenever a symlink vs. kset directory
492 static int fw_cfg_build_symlink(struct kset *dir,  in fw_cfg_build_symlink()  argument
500 	if (!dir || !target || !name || !*name)  in fw_cfg_build_symlink()
501 		return -EINVAL;  in fw_cfg_build_symlink()
506 		return -ENOMEM;  in fw_cfg_build_symlink()
513 			ret = sysfs_create_link(&dir->kobj, target, tok);  in fw_cfg_build_symlink()
517 		/* does the current dir contain an item named after tok ? */  in fw_cfg_build_symlink()
518 		ko = kset_find_obj(dir, tok);  in fw_cfg_build_symlink()
523 			/* ko MUST be a kset - we're about to use it as one ! */  in fw_cfg_build_symlink()
524 			if (ko->ktype != dir->kobj.ktype) {  in fw_cfg_build_symlink()
525 				ret = -EINVAL;  in fw_cfg_build_symlink()
530 			dir = to_kset(ko);  in fw_cfg_build_symlink()
535 				ret = -ENOMEM;  in fw_cfg_build_symlink()
538 			subdir->kobj.kset = dir;  in fw_cfg_build_symlink()
539 			subdir->kobj.ktype = dir->kobj.ktype;  in fw_cfg_build_symlink()
540 			ret = kobject_set_name(&subdir->kobj, "%s", tok);  in fw_cfg_build_symlink()
552 			dir = subdir;  in fw_cfg_build_symlink()
566 	list_for_each_entry_safe(k, next, &kset->list, entry)  in fw_cfg_kset_unregister_recursive()
568 		if (k->ktype == kset->kobj.ktype)  in fw_cfg_kset_unregister_recursive()
575 /* kobjects & kset representing top-level, by_key, and by_name folders */
588 		strcmp(f->name, FW_CFG_VMCOREINFO_FILENAME) == 0 &&  in fw_cfg_register_file()
598 		return -ENOMEM;  in fw_cfg_register_file()
601 	entry->size = be32_to_cpu(f->size);  in fw_cfg_register_file()
602 	entry->select = be16_to_cpu(f->select);  in fw_cfg_register_file()
603 	strscpy(entry->name, f->name, FW_CFG_MAX_FILE_PATH);  in fw_cfg_register_file()
606 	err = kobject_init_and_add(&entry->kobj, &fw_cfg_sysfs_entry_ktype,  in fw_cfg_register_file()
607 				   fw_cfg_sel_ko, "%d", entry->select);  in fw_cfg_register_file()
612 	err = sysfs_create_bin_file(&entry->kobj, &fw_cfg_sysfs_attr_raw);  in fw_cfg_register_file()
617 	fw_cfg_build_symlink(fw_cfg_fname_kset, &entry->kobj, entry->name);  in fw_cfg_register_file()
624 	kobject_del(&entry->kobj);  in fw_cfg_register_file()
626 	kobject_put(&entry->kobj);  in fw_cfg_register_file()
636 	struct fw_cfg_file *dir;  in fw_cfg_register_dir_entries()  local
647 	dir = kmalloc(dir_size, GFP_KERNEL);  in fw_cfg_register_dir_entries()
648 	if (!dir)  in fw_cfg_register_dir_entries()
649 		return -ENOMEM;  in fw_cfg_register_dir_entries()
651 	ret = fw_cfg_read_blob(FW_CFG_FILE_DIR, dir,  in fw_cfg_register_dir_entries()
657 		ret = fw_cfg_register_file(&dir[i]);  in fw_cfg_register_dir_entries()
663 	kfree(dir);  in fw_cfg_register_dir_entries()
667 /* unregister top-level or by_key folder */
680 	 * a subdirectory named after e.g. pdev->id, then hang per-device  in fw_cfg_sysfs_probe()
682 	 * one fw_cfg device exist system-wide, so if one was already found  in fw_cfg_sysfs_probe()
686 		return -EBUSY;  in fw_cfg_sysfs_probe()
689 	err = -ENOMEM;  in fw_cfg_sysfs_probe()
702 	/* get revision number, add matching top-level attribute */  in fw_cfg_sysfs_probe()
746 	{ .compatible = "qemu,fw-cfg-mmio", },
806 	/* only one fw_cfg device can exist system-wide, so if one  in fw_cfg_cmdline_set()
813 		return -EINVAL;  in fw_cfg_cmdline_set()
833 		return -EINVAL;  in fw_cfg_cmdline_set()
836 	res[0].end = base + size - 1;  in fw_cfg_cmdline_set()
837 	res[0].flags = !strcmp(kp->name, "mmio") ? IORESOURCE_MEM :  in fw_cfg_cmdline_set()
871 	    (!strcmp(kp->name, "mmio") ^  in fw_cfg_cmdline_get()
872 	     (fw_cfg_cmdline_dev->resource[0].flags == IORESOURCE_MEM)))  in fw_cfg_cmdline_get()
875 	switch (fw_cfg_cmdline_dev->num_resources) {  in fw_cfg_cmdline_get()
878 				resource_size(&fw_cfg_cmdline_dev->resource[0]),  in fw_cfg_cmdline_get()
879 				fw_cfg_cmdline_dev->resource[0].start);  in fw_cfg_cmdline_get()
882 				resource_size(&fw_cfg_cmdline_dev->resource[0]),  in fw_cfg_cmdline_get()
883 				fw_cfg_cmdline_dev->resource[0].start,  in fw_cfg_cmdline_get()
884 				fw_cfg_cmdline_dev->resource[1].start,  in fw_cfg_cmdline_get()
885 				fw_cfg_cmdline_dev->resource[2].start);  in fw_cfg_cmdline_get()
888 				resource_size(&fw_cfg_cmdline_dev->resource[0]),  in fw_cfg_cmdline_get()
889 				fw_cfg_cmdline_dev->resource[0].start,  in fw_cfg_cmdline_get()
890 				fw_cfg_cmdline_dev->resource[1].start,  in fw_cfg_cmdline_get()
891 				fw_cfg_cmdline_dev->resource[2].start,  in fw_cfg_cmdline_get()
892 				fw_cfg_cmdline_dev->resource[3].start);  in fw_cfg_cmdline_get()
897 		fw_cfg_cmdline_dev->num_resources);  in fw_cfg_cmdline_get()
918 		return -ENOMEM;  in fw_cfg_sysfs_init()