1 files changed, 633 insertions, 0 deletions

diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
new file mode 100644
index 000000000..15c17f378
--- /dev/null
+++ b/drivers/ide/ide-proc.c
@@ -0,0 +1,633 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Copyright (C) 1997-1998	Mark Lord
+ *  Copyright (C) 2003		Red Hat
+ *
+ *  Some code was moved here from ide.c, see it for original copyrights.
+ */
+
+/*
+ * This is the /proc/ide/ filesystem implementation.
+ *
+ * Drive/Driver settings can be retrieved by reading the drive's
+ * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
+ * To write a new value "val" into a specific setting "name", use:
+ *   echo "name:val" >/proc/ide/ide0/hda/settings
+ */
+
+#include <linux/module.h>
+
+#include <linux/uaccess.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/mm.h>
+#include <linux/pci.h>
+#include <linux/ctype.h>
+#include <linux/ide.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+
+static struct proc_dir_entry *proc_ide_root;
+
+static int ide_imodel_proc_show(struct seq_file *m, void *v)
+{
+	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;
+	const char	*name;
+
+	switch (hwif->chipset) {
+	case ide_generic:	name = "generic";	break;
+	case ide_pci:		name = "pci";		break;
+	case ide_cmd640:	name = "cmd640";	break;
+	case ide_dtc2278:	name = "dtc2278";	break;
+	case ide_ali14xx:	name = "ali14xx";	break;
+	case ide_qd65xx:	name = "qd65xx";	break;
+	case ide_umc8672:	name = "umc8672";	break;
+	case ide_ht6560b:	name = "ht6560b";	break;
+	case ide_4drives:	name = "4drives";	break;
+	case ide_pmac:		name = "mac-io";	break;
+	case ide_au1xxx:	name = "au1xxx";	break;
+	case ide_palm3710:      name = "palm3710";      break;
+	case ide_acorn:		name = "acorn";		break;
+	default:		name = "(unknown)";	break;
+	}
+	seq_printf(m, "%s\n", name);
+	return 0;
+}
+
+static int ide_mate_proc_show(struct seq_file *m, void *v)
+{
+	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;
+
+	if (hwif && hwif->mate)
+		seq_printf(m, "%s\n", hwif->mate->name);
+	else
+		seq_printf(m, "(none)\n");
+	return 0;
+}
+
+static int ide_channel_proc_show(struct seq_file *m, void *v)
+{
+	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;
+
+	seq_printf(m, "%c\n", hwif->channel ? '1' : '0');
+	return 0;
+}
+
+static int ide_identify_proc_show(struct seq_file *m, void *v)
+{
+	ide_drive_t *drive = (ide_drive_t *)m->private;
+	u8 *buf;
+
+	if (!drive) {
+		seq_putc(m, '\n');
+		return 0;
+	}
+
+	buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+	if (taskfile_lib_get_identify(drive, buf) == 0) {
+		__le16 *val = (__le16 *)buf;
+		int i;
+
+		for (i = 0; i < SECTOR_SIZE / 2; i++) {
+			seq_printf(m, "%04x%c", le16_to_cpu(val[i]),
+					(i % 8) == 7 ? '\n' : ' ');
+		}
+	} else
+		seq_putc(m, buf[0]);
+	kfree(buf);
+	return 0;
+}
+
+/**
+ *	ide_find_setting	-	find a specific setting
+ *	@st: setting table pointer
+ *	@name: setting name
+ *
+ *	Scan's the setting table for a matching entry and returns
+ *	this or NULL if no entry is found. The caller must hold the
+ *	setting semaphore
+ */
+
+static
+const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
+					       char *name)
+{
+	while (st->name) {
+		if (strcmp(st->name, name) == 0)
+			break;
+		st++;
+	}
+	return st->name ? st : NULL;
+}
+
+/**
+ *	ide_read_setting	-	read an IDE setting
+ *	@drive: drive to read from
+ *	@setting: drive setting
+ *
+ *	Read a drive setting and return the value. The caller
+ *	must hold the ide_setting_mtx when making this call.
+ *
+ *	BUGS: the data return and error are the same return value
+ *	so an error -EINVAL and true return of the same value cannot
+ *	be told apart
+ */
+
+static int ide_read_setting(ide_drive_t *drive,
+			    const struct ide_proc_devset *setting)
+{
+	const struct ide_devset *ds = setting->setting;
+	int val = -EINVAL;
+
+	if (ds->get)
+		val = ds->get(drive);
+
+	return val;
+}
+
+/**
+ *	ide_write_setting	-	read an IDE setting
+ *	@drive: drive to read from
+ *	@setting: drive setting
+ *	@val: value
+ *
+ *	Write a drive setting if it is possible. The caller
+ *	must hold the ide_setting_mtx when making this call.
+ *
+ *	BUGS: the data return and error are the same return value
+ *	so an error -EINVAL and true return of the same value cannot
+ *	be told apart
+ *
+ *	FIXME:  This should be changed to enqueue a special request
+ *	to the driver to change settings, and then wait on a sema for completion.
+ *	The current scheme of polling is kludgy, though safe enough.
+ */
+
+static int ide_write_setting(ide_drive_t *drive,
+			     const struct ide_proc_devset *setting, int val)
+{
+	const struct ide_devset *ds = setting->setting;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+	if (!ds->set)
+		return -EPERM;
+	if ((ds->flags & DS_SYNC)
+	    && (val < setting->min || val > setting->max))
+		return -EINVAL;
+	return ide_devset_execute(drive, ds, val);
+}
+
+ide_devset_get(xfer_rate, current_speed);
+
+static int set_xfer_rate (ide_drive_t *drive, int arg)
+{
+	struct ide_cmd cmd;
+
+	if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
+		return -EINVAL;
+
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.tf.command = ATA_CMD_SET_FEATURES;
+	cmd.tf.feature = SETFEATURES_XFER;
+	cmd.tf.nsect   = (u8)arg;
+	cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
+	cmd.valid.in.tf  = IDE_VALID_NSECT;
+	cmd.tf_flags   = IDE_TFLAG_SET_XFER;
+
+	return ide_no_data_taskfile(drive, &cmd);
+}
+
+ide_devset_rw(current_speed, xfer_rate);
+ide_devset_rw_field(init_speed, init_speed);
+ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
+ide_devset_ro_field(number, dn);
+
+static const struct ide_proc_devset ide_generic_settings[] = {
+	IDE_PROC_DEVSET(current_speed, 0, 70),
+	IDE_PROC_DEVSET(init_speed, 0, 70),
+	IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
+	IDE_PROC_DEVSET(keepsettings, 0, 1),
+	IDE_PROC_DEVSET(nice1, 0, 1),
+	IDE_PROC_DEVSET(number, 0, 3),
+	IDE_PROC_DEVSET(pio_mode, 0, 255),
+	IDE_PROC_DEVSET(unmaskirq, 0, 1),
+	IDE_PROC_DEVSET(using_dma, 0, 1),
+	{ NULL },
+};
+
+static void proc_ide_settings_warn(void)
+{
+	printk_once(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
+			    "obsolete, and will be removed soon!\n");
+}
+
+static int ide_settings_proc_show(struct seq_file *m, void *v)
+{
+	const struct ide_proc_devset *setting, *g, *d;
+	const struct ide_devset *ds;
+	ide_drive_t	*drive = (ide_drive_t *) m->private;
+	int		rc, mul_factor, div_factor;
+
+	proc_ide_settings_warn();
+
+	mutex_lock(&ide_setting_mtx);
+	g = ide_generic_settings;
+	d = drive->settings;
+	seq_printf(m, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
+	seq_printf(m, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
+	while (g->name || (d && d->name)) {
+		/* read settings in the alphabetical order */
+		if (g->name && d && d->name) {
+			if (strcmp(d->name, g->name) < 0)
+				setting = d++;
+			else
+				setting = g++;
+		} else if (d && d->name) {
+			setting = d++;
+		} else
+			setting = g++;
+		mul_factor = setting->mulf ? setting->mulf(drive) : 1;
+		div_factor = setting->divf ? setting->divf(drive) : 1;
+		seq_printf(m, "%-24s", setting->name);
+		rc = ide_read_setting(drive, setting);
+		if (rc >= 0)
+			seq_printf(m, "%-16d", rc * mul_factor / div_factor);
+		else
+			seq_printf(m, "%-16s", "write-only");
+		seq_printf(m, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
+		ds = setting->setting;
+		if (ds->get)
+			seq_printf(m, "r");
+		if (ds->set)
+			seq_printf(m, "w");
+		seq_printf(m, "\n");
+	}
+	mutex_unlock(&ide_setting_mtx);
+	return 0;
+}
+
+static int ide_settings_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ide_settings_proc_show, PDE_DATA(inode));
+}
+
+#define MAX_LEN	30
+
+static ssize_t ide_settings_proc_write(struct file *file, const char __user *buffer,
+				       size_t count, loff_t *pos)
+{
+	ide_drive_t	*drive = PDE_DATA(file_inode(file));
+	char		name[MAX_LEN + 1];
+	int		for_real = 0, mul_factor, div_factor;
+	unsigned long	n;
+
+	const struct ide_proc_devset *setting;
+	char *buf, *s;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	proc_ide_settings_warn();
+
+	if (count >= PAGE_SIZE)
+		return -EINVAL;
+
+	s = buf = (char *)__get_free_page(GFP_USER);
+	if (!buf)
+		return -ENOMEM;
+
+	if (copy_from_user(buf, buffer, count)) {
+		free_page((unsigned long)buf);
+		return -EFAULT;
+	}
+
+	buf[count] = '\0';
+
+	/*
+	 * Skip over leading whitespace
+	 */
+	while (count && isspace(*s)) {
+		--count;
+		++s;
+	}
+	/*
+	 * Do one full pass to verify all parameters,
+	 * then do another to actually write the new settings.
+	 */
+	do {
+		char *p = s;
+		n = count;
+		while (n > 0) {
+			unsigned val;
+			char *q = p;
+
+			while (n > 0 && *p != ':') {
+				--n;
+				p++;
+			}
+			if (*p != ':')
+				goto parse_error;
+			if (p - q > MAX_LEN)
+				goto parse_error;
+			memcpy(name, q, p - q);
+			name[p - q] = 0;
+
+			if (n > 0) {
+				--n;
+				p++;
+			} else
+				goto parse_error;
+
+			val = simple_strtoul(p, &q, 10);
+			n -= q - p;
+			p = q;
+			if (n > 0 && !isspace(*p))
+				goto parse_error;
+			while (n > 0 && isspace(*p)) {
+				--n;
+				++p;
+			}
+
+			mutex_lock(&ide_setting_mtx);
+			/* generic settings first, then driver specific ones */
+			setting = ide_find_setting(ide_generic_settings, name);
+			if (!setting) {
+				if (drive->settings)
+					setting = ide_find_setting(drive->settings, name);
+				if (!setting) {
+					mutex_unlock(&ide_setting_mtx);
+					goto parse_error;
+				}
+			}
+			if (for_real) {
+				mul_factor = setting->mulf ? setting->mulf(drive) : 1;
+				div_factor = setting->divf ? setting->divf(drive) : 1;
+				ide_write_setting(drive, setting, val * div_factor / mul_factor);
+			}
+			mutex_unlock(&ide_setting_mtx);
+		}
+	} while (!for_real++);
+	free_page((unsigned long)buf);
+	return count;
+parse_error:
+	free_page((unsigned long)buf);
+	printk("%s(): parse error\n", __func__);
+	return -EINVAL;
+}
+
+static const struct proc_ops ide_settings_proc_ops = {
+	.proc_open	= ide_settings_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= ide_settings_proc_write,
+};
+
+int ide_capacity_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%llu\n", (long long)0x7fffffff);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ide_capacity_proc_show);
+
+int ide_geometry_proc_show(struct seq_file *m, void *v)
+{
+	ide_drive_t	*drive = (ide_drive_t *) m->private;
+
+	seq_printf(m, "physical     %d/%d/%d\n",
+			drive->cyl, drive->head, drive->sect);
+	seq_printf(m, "logical      %d/%d/%d\n",
+			drive->bios_cyl, drive->bios_head, drive->bios_sect);
+	return 0;
+}
+EXPORT_SYMBOL(ide_geometry_proc_show);
+
+static int ide_dmodel_proc_show(struct seq_file *seq, void *v)
+{
+	ide_drive_t	*drive = (ide_drive_t *) seq->private;
+	char		*m = (char *)&drive->id[ATA_ID_PROD];
+
+	seq_printf(seq, "%.40s\n", m[0] ? m : "(none)");
+	return 0;
+}
+
+static int ide_driver_proc_show(struct seq_file *m, void *v)
+{
+	ide_drive_t		*drive = (ide_drive_t *)m->private;
+	struct device		*dev = &drive->gendev;
+	struct ide_driver	*ide_drv;
+
+	if (dev->driver) {
+		ide_drv = to_ide_driver(dev->driver);
+		seq_printf(m, "%s version %s\n",
+				dev->driver->name, ide_drv->version);
+	} else
+		seq_printf(m, "ide-default version 0.9.newide\n");
+	return 0;
+}
+
+static int ide_media_proc_show(struct seq_file *m, void *v)
+{
+	ide_drive_t	*drive = (ide_drive_t *) m->private;
+	const char	*media;
+
+	switch (drive->media) {
+	case ide_disk:		media = "disk\n";	break;
+	case ide_cdrom:		media = "cdrom\n";	break;
+	case ide_tape:		media = "tape\n";	break;
+	case ide_floppy:	media = "floppy\n";	break;
+	case ide_optical:	media = "optical\n";	break;
+	default:		media = "UNKNOWN\n";	break;
+	}
+	seq_puts(m, media);
+	return 0;
+}
+
+static int ide_media_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ide_media_proc_show, PDE_DATA(inode));
+}
+
+static const struct file_operations ide_media_proc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= ide_media_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static ide_proc_entry_t generic_drive_entries[] = {
+	{ "driver",	S_IFREG|S_IRUGO,	 ide_driver_proc_show	},
+	{ "identify",	S_IFREG|S_IRUSR,	 ide_identify_proc_show	},
+	{ "media",	S_IFREG|S_IRUGO,	 ide_media_proc_show	},
+	{ "model",	S_IFREG|S_IRUGO,	 ide_dmodel_proc_show	},
+	{}
+};
+
+static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
+{
+	struct proc_dir_entry *ent;
+
+	if (!dir || !p)
+		return;
+	while (p->name != NULL) {
+		ent = proc_create_single_data(p->name, p->mode, dir, p->show, data);
+		if (!ent) return;
+		p++;
+	}
+}
+
+static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
+{
+	if (!dir || !p)
+		return;
+	while (p->name != NULL) {
+		remove_proc_entry(p->name, dir);
+		p++;
+	}
+}
+
+void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
+{
+	mutex_lock(&ide_setting_mtx);
+	drive->settings = driver->proc_devsets(drive);
+	mutex_unlock(&ide_setting_mtx);
+
+	ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
+}
+
+EXPORT_SYMBOL(ide_proc_register_driver);
+
+/**
+ *	ide_proc_unregister_driver	-	remove driver specific data
+ *	@drive: drive
+ *	@driver: driver
+ *
+ *	Clean up the driver specific /proc files and IDE settings
+ *	for a given drive.
+ *
+ *	Takes ide_setting_mtx.
+ */
+
+void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
+{
+	ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
+
+	mutex_lock(&ide_setting_mtx);
+	/*
+	 * ide_setting_mtx protects both the settings list and the use
+	 * of settings (we cannot take a setting out that is being used).
+	 */
+	drive->settings = NULL;
+	mutex_unlock(&ide_setting_mtx);
+}
+EXPORT_SYMBOL(ide_proc_unregister_driver);
+
+void ide_proc_port_register_devices(ide_hwif_t *hwif)
+{
+	struct proc_dir_entry *ent;
+	struct proc_dir_entry *parent = hwif->proc;
+	ide_drive_t *drive;
+	char name[64];
+	int i;
+
+	ide_port_for_each_dev(i, drive, hwif) {
+		if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
+			continue;
+
+		drive->proc = proc_mkdir(drive->name, parent);
+		if (drive->proc) {
+			ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
+			proc_create_data("settings", S_IFREG|S_IRUSR|S_IWUSR,
+					drive->proc, &ide_settings_proc_ops,
+					drive);
+		}
+		sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
+		ent = proc_symlink(drive->name, proc_ide_root, name);
+		if (!ent) return;
+	}
+}
+
+void ide_proc_unregister_device(ide_drive_t *drive)
+{
+	if (drive->proc) {
+		remove_proc_entry("settings", drive->proc);
+		ide_remove_proc_entries(drive->proc, generic_drive_entries);
+		remove_proc_entry(drive->name, proc_ide_root);
+		remove_proc_entry(drive->name, drive->hwif->proc);
+		drive->proc = NULL;
+	}
+}
+
+static ide_proc_entry_t hwif_entries[] = {
+	{ "channel",	S_IFREG|S_IRUGO,	ide_channel_proc_show	},
+	{ "mate",	S_IFREG|S_IRUGO,	ide_mate_proc_show	},
+	{ "model",	S_IFREG|S_IRUGO,	ide_imodel_proc_show	},
+	{}
+};
+
+void ide_proc_register_port(ide_hwif_t *hwif)
+{
+	if (!hwif->proc) {
+		hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
+
+		if (!hwif->proc)
+			return;
+
+		ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
+	}
+}
+
+void ide_proc_unregister_port(ide_hwif_t *hwif)
+{
+	if (hwif->proc) {
+		ide_remove_proc_entries(hwif->proc, hwif_entries);
+		remove_proc_entry(hwif->name, proc_ide_root);
+		hwif->proc = NULL;
+	}
+}
+
+static int proc_print_driver(struct device_driver *drv, void *data)
+{
+	struct ide_driver *ide_drv = to_ide_driver(drv);
+	struct seq_file *s = data;
+
+	seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
+
+	return 0;
+}
+
+static int ide_drivers_show(struct seq_file *s, void *p)
+{
+	int err;
+
+	err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
+	if (err < 0)
+		printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
+			__func__, err);
+	return 0;
+}
+
+DEFINE_PROC_SHOW_ATTRIBUTE(ide_drivers);
+
+void proc_ide_create(void)
+{
+	proc_ide_root = proc_mkdir("ide", NULL);
+
+	if (!proc_ide_root)
+		return;
+
+	proc_create("drivers", 0, proc_ide_root, &ide_drivers_proc_ops);
+}
+
+void proc_ide_destroy(void)
+{
+	remove_proc_entry("drivers", proc_ide_root);
+	remove_proc_entry("ide", NULL);
+}