/* * linux/arch/i386/kernel/edd.c *  Copyright (C) 2002, 2003, 2004 Dell Inc. *  by Matt Domsch <Matt_Domsch@dell.com> *  disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya *  legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net> * * BIOS Enhanced Disk Drive Services (EDD) * conformant to T13 Committee www.t13.org *   projects 1572D, 1484D, 1386D, 1226DT * * This code takes information provided by BIOS EDD calls * fn41 - Check Extensions Present and * fn48 - Get Device Parametes with EDD extensions * made in setup.S, copied to safe structures in setup.c, * and presents it in sysfs. * * Please see http://linux.dell.com/edd30/results.html for * the list of BIOSs which have been reported to implement EDD. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License v2.0 as published by * the Free Software Foundation * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * */#include <linux/module.h>#include <linux/string.h>#include <linux/types.h>#include <linux/init.h>#include <linux/stat.h>#include <linux/err.h>#include <linux/ctype.h>#include <linux/slab.h>#include <linux/limits.h>#include <linux/device.h>#include <linux/pci.h>#include <linux/blkdev.h>#include <linux/edd.h>#define EDD_VERSION "0.16"#define EDD_DATE    "2004-Jun-25"MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");MODULE_LICENSE("GPL");MODULE_VERSION(EDD_VERSION);#define left (PAGE_SIZE - (p - buf) - 1)struct edd_device {	unsigned int index;	unsigned int mbr_signature;	struct edd_info *info;	struct kobject kobj;};struct edd_attribute {	struct attribute attr;	ssize_t(*show) (struct edd_device * edev, char *buf);	int (*test) (struct edd_device * edev);};/* forward declarations */static int edd_dev_is_type(struct edd_device *edev, const char *type);static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];#define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \struct edd_attribute edd_attr_##_name = { 	\	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\	.show	= _show,				\	.test	= _test,				\};static intedd_has_mbr_signature(struct edd_device *edev){	return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);}static intedd_has_edd_info(struct edd_device *edev){	return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);}static inline struct edd_info *edd_dev_get_info(struct edd_device *edev){	return edev->info;}static inline voidedd_dev_set_info(struct edd_device *edev, int i){	edev->index = i;	if (edd_has_mbr_signature(edev))		edev->mbr_signature = edd.mbr_signature[i];	if (edd_has_edd_info(edev))		edev->info = &edd.edd_info[i];}#define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)#define to_edd_device(obj) container_of(obj,struct edd_device,kobj)static ssize_tedd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf){	struct edd_device *dev = to_edd_device(kobj);	struct edd_attribute *edd_attr = to_edd_attr(attr);	ssize_t ret = -EIO;	if (edd_attr->show)		ret = edd_attr->show(dev, buf);	return ret;}static struct sysfs_ops edd_attr_ops = {	.show = edd_attr_show,};static ssize_tedd_show_host_bus(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	int i;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	for (i = 0; i < 4; i++) {		if (isprint(info->params.host_bus_type[i])) {			p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);		} else {			p += scnprintf(p, left, " ");		}	}	if (!strncmp(info->params.host_bus_type, "ISA", 3)) {		p += scnprintf(p, left, "\tbase_address: %x\n",			     info->params.interface_path.isa.base_address);	} else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||		   !strncmp(info->params.host_bus_type, "PCI", 3)) {		p += scnprintf(p, left,			     "\t%02x:%02x.%d  channel: %u\n",			     info->params.interface_path.pci.bus,			     info->params.interface_path.pci.slot,			     info->params.interface_path.pci.function,			     info->params.interface_path.pci.channel);	} else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||		   !strncmp(info->params.host_bus_type, "XPRS", 4) ||		   !strncmp(info->params.host_bus_type, "HTPT", 4)) {		p += scnprintf(p, left,			     "\tTBD: %llx\n",			     info->params.interface_path.ibnd.reserved);	} else {		p += scnprintf(p, left, "\tunknown: %llx\n",			     info->params.interface_path.unknown.reserved);	}	return (p - buf);}static ssize_tedd_show_interface(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	int i;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	for (i = 0; i < 8; i++) {		if (isprint(info->params.interface_type[i])) {			p += scnprintf(p, left, "%c", info->params.interface_type[i]);		} else {			p += scnprintf(p, left, " ");		}	}	if (!strncmp(info->params.interface_type, "ATAPI", 5)) {		p += scnprintf(p, left, "\tdevice: %u  lun: %u\n",			     info->params.device_path.atapi.device,			     info->params.device_path.atapi.lun);	} else if (!strncmp(info->params.interface_type, "ATA", 3)) {		p += scnprintf(p, left, "\tdevice: %u\n",			     info->params.device_path.ata.device);	} else if (!strncmp(info->params.interface_type, "SCSI", 4)) {		p += scnprintf(p, left, "\tid: %u  lun: %llu\n",			     info->params.device_path.scsi.id,			     info->params.device_path.scsi.lun);	} else if (!strncmp(info->params.interface_type, "USB", 3)) {		p += scnprintf(p, left, "\tserial_number: %llx\n",			     info->params.device_path.usb.serial_number);	} else if (!strncmp(info->params.interface_type, "1394", 4)) {		p += scnprintf(p, left, "\teui: %llx\n",			     info->params.device_path.i1394.eui);	} else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {		p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",			     info->params.device_path.fibre.wwid,			     info->params.device_path.fibre.lun);	} else if (!strncmp(info->params.interface_type, "I2O", 3)) {		p += scnprintf(p, left, "\tidentity_tag: %llx\n",			     info->params.device_path.i2o.identity_tag);	} else if (!strncmp(info->params.interface_type, "RAID", 4)) {		p += scnprintf(p, left, "\tidentity_tag: %x\n",			     info->params.device_path.raid.array_number);	} else if (!strncmp(info->params.interface_type, "SATA", 4)) {		p += scnprintf(p, left, "\tdevice: %u\n",			     info->params.device_path.sata.device);	} else {		p += scnprintf(p, left, "\tunknown: %llx %llx\n",			     info->params.device_path.unknown.reserved1,			     info->params.device_path.unknown.reserved2);	}	return (p - buf);}/** * edd_show_raw_data() - copies raw data to buffer for userspace to parse * * Returns: number of bytes written, or -EINVAL on failure */static ssize_tedd_show_raw_data(struct edd_device *edev, char *buf){	struct edd_info *info;	ssize_t len = sizeof (info->params);	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))		len = info->params.length;	/* In case of buggy BIOSs */	if (len > (sizeof(info->params)))		len = sizeof(info->params);	memcpy(buf, &info->params, len);	return len;}static ssize_tedd_show_version(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	p += scnprintf(p, left, "0x%02x\n", info->version);	return (p - buf);}static ssize_tedd_show_mbr_signature(struct edd_device *edev, char *buf){	char *p = buf;	p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);	return (p - buf);}static ssize_tedd_show_extensions(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {		p += scnprintf(p, left, "Fixed disk access\n");	}	if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {		p += scnprintf(p, left, "Device locking and ejecting\n");	}	if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {		p += scnprintf(p, left, "Enhanced Disk Drive support\n");	}	if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {		p += scnprintf(p, left, "64-bit extensions\n");	}	return (p - buf);}static ssize_tedd_show_info_flags(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)		p += scnprintf(p, left, "DMA boundary error transparent\n");	if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)		p += scnprintf(p, left, "geometry valid\n");	if (info->params.info_flags & EDD_INFO_REMOVABLE)		p += scnprintf(p, left, "removable\n");	if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)		p += scnprintf(p, left, "write verify\n");	if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)		p += scnprintf(p, left, "media change notification\n");	if (info->params.info_flags & EDD_INFO_LOCKABLE)		p += scnprintf(p, left, "lockable\n");	if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)		p += scnprintf(p, left, "no media present\n");	if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)		p += scnprintf(p, left, "use int13 fn50\n");	return (p - buf);}static ssize_tedd_show_legacy_max_cylinder(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	p += snprintf(p, left, "%u\n", info->legacy_max_cylinder);	return (p - buf);}static ssize_tedd_show_legacy_max_head(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	p += snprintf(p, left, "%u\n", info->legacy_max_head);	return (p - buf);}static ssize_tedd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;	p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);	return (p - buf);}static ssize_tedd_show_default_cylinders(struct edd_device *edev, char *buf){	struct edd_info *info;	char *p = buf;	if (!edev)		return -EINVAL;	info = edd_dev_get_info(edev);	if (!info || !buf)		return -EINVAL;