![Federico Vaga](/assets/img/avatar_default.png)
The vio_remove() function uses device_find_child() but it does not drop the reference of the retrieved child. Signed-off-by: Federico Vaga <federico.vaga@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
464 lines
10 KiB
C
464 lines
10 KiB
C
/* vio.c: Virtual I/O channel devices probing infrastructure.
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*
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* Copyright (c) 2003-2005 IBM Corp.
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* Dave Engebretsen engebret@us.ibm.com
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* Santiago Leon santil@us.ibm.com
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* Hollis Blanchard <hollisb@us.ibm.com>
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* Stephen Rothwell
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*
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* Adapted to sparc64 by David S. Miller davem@davemloft.net
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <asm/mdesc.h>
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#include <asm/vio.h>
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static const struct vio_device_id *vio_match_device(
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const struct vio_device_id *matches,
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const struct vio_dev *dev)
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{
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const char *type, *compat;
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int len;
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type = dev->type;
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compat = dev->compat;
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len = dev->compat_len;
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while (matches->type[0] || matches->compat[0]) {
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int match = 1;
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if (matches->type[0])
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match &= !strcmp(matches->type, type);
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if (matches->compat[0]) {
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match &= len &&
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of_find_in_proplist(compat, matches->compat, len);
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}
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if (match)
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return matches;
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matches++;
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}
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return NULL;
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}
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static int vio_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct vio_dev *vio_dev = to_vio_dev(dev);
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struct vio_driver *vio_drv = to_vio_driver(drv);
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const struct vio_device_id *matches = vio_drv->id_table;
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if (!matches)
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return 0;
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return vio_match_device(matches, vio_dev) != NULL;
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}
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static int vio_device_probe(struct device *dev)
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{
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struct vio_dev *vdev = to_vio_dev(dev);
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struct vio_driver *drv = to_vio_driver(dev->driver);
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const struct vio_device_id *id;
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int error = -ENODEV;
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if (drv->probe) {
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id = vio_match_device(drv->id_table, vdev);
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if (id)
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error = drv->probe(vdev, id);
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}
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return error;
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}
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static int vio_device_remove(struct device *dev)
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{
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struct vio_dev *vdev = to_vio_dev(dev);
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struct vio_driver *drv = to_vio_driver(dev->driver);
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if (drv->remove)
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return drv->remove(vdev);
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return 1;
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}
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static ssize_t devspec_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct vio_dev *vdev = to_vio_dev(dev);
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const char *str = "none";
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if (!strcmp(vdev->type, "vnet-port"))
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str = "vnet";
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else if (!strcmp(vdev->type, "vdc-port"))
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str = "vdisk";
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return sprintf(buf, "%s\n", str);
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}
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static ssize_t type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct vio_dev *vdev = to_vio_dev(dev);
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return sprintf(buf, "%s\n", vdev->type);
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}
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static struct device_attribute vio_dev_attrs[] = {
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__ATTR_RO(devspec),
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__ATTR_RO(type),
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__ATTR_NULL
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};
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static struct bus_type vio_bus_type = {
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.name = "vio",
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.dev_attrs = vio_dev_attrs,
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.match = vio_bus_match,
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.probe = vio_device_probe,
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.remove = vio_device_remove,
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};
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int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
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const char *mod_name)
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{
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viodrv->driver.bus = &vio_bus_type;
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viodrv->driver.name = viodrv->name;
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viodrv->driver.owner = owner;
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viodrv->driver.mod_name = mod_name;
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return driver_register(&viodrv->driver);
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}
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EXPORT_SYMBOL(__vio_register_driver);
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void vio_unregister_driver(struct vio_driver *viodrv)
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{
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driver_unregister(&viodrv->driver);
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}
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EXPORT_SYMBOL(vio_unregister_driver);
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static void vio_dev_release(struct device *dev)
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{
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kfree(to_vio_dev(dev));
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}
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static ssize_t
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show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct vio_dev *vdev;
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struct device_node *dp;
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vdev = to_vio_dev(dev);
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dp = vdev->dp;
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return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
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}
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static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
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show_pciobppath_attr, NULL);
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static struct device_node *cdev_node;
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static struct vio_dev *root_vdev;
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static u64 cdev_cfg_handle;
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static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
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struct vio_dev *vdev)
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{
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u64 a;
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mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
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const u64 *chan_id;
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const u64 *irq;
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u64 target;
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target = mdesc_arc_target(hp, a);
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irq = mdesc_get_property(hp, target, "tx-ino", NULL);
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if (irq)
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vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
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irq = mdesc_get_property(hp, target, "rx-ino", NULL);
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if (irq)
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vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
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chan_id = mdesc_get_property(hp, target, "id", NULL);
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if (chan_id)
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vdev->channel_id = *chan_id;
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}
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}
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static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
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struct device *parent)
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{
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const char *type, *compat, *bus_id_name;
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struct device_node *dp;
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struct vio_dev *vdev;
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int err, tlen, clen;
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const u64 *id, *cfg_handle;
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u64 a;
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type = mdesc_get_property(hp, mp, "device-type", &tlen);
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if (!type) {
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type = mdesc_get_property(hp, mp, "name", &tlen);
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if (!type) {
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type = mdesc_node_name(hp, mp);
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tlen = strlen(type) + 1;
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}
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}
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if (tlen > VIO_MAX_TYPE_LEN) {
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printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
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type);
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return NULL;
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}
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id = mdesc_get_property(hp, mp, "id", NULL);
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cfg_handle = NULL;
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mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
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u64 target;
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target = mdesc_arc_target(hp, a);
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cfg_handle = mdesc_get_property(hp, target,
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"cfg-handle", NULL);
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if (cfg_handle)
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break;
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}
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bus_id_name = type;
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if (!strcmp(type, "domain-services-port"))
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bus_id_name = "ds";
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/*
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* 20 char is the old driver-core name size limit, which is no more.
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* This check can probably be removed after review and possible
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* adaption of the vio users name length handling.
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*/
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if (strlen(bus_id_name) >= 20 - 4) {
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printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
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bus_id_name);
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return NULL;
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}
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compat = mdesc_get_property(hp, mp, "device-type", &clen);
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if (!compat) {
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clen = 0;
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} else if (clen > VIO_MAX_COMPAT_LEN) {
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printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
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clen, type);
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return NULL;
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}
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vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
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if (!vdev) {
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printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
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return NULL;
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}
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vdev->mp = mp;
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memcpy(vdev->type, type, tlen);
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if (compat)
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memcpy(vdev->compat, compat, clen);
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else
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memset(vdev->compat, 0, sizeof(vdev->compat));
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vdev->compat_len = clen;
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vdev->channel_id = ~0UL;
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vdev->tx_irq = ~0;
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vdev->rx_irq = ~0;
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vio_fill_channel_info(hp, mp, vdev);
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if (!id) {
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dev_set_name(&vdev->dev, "%s", bus_id_name);
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vdev->dev_no = ~(u64)0;
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} else if (!cfg_handle) {
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dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
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vdev->dev_no = *id;
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} else {
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dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
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*cfg_handle, *id);
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vdev->dev_no = *cfg_handle;
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}
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vdev->dev.parent = parent;
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vdev->dev.bus = &vio_bus_type;
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vdev->dev.release = vio_dev_release;
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if (parent == NULL) {
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dp = cdev_node;
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} else if (to_vio_dev(parent) == root_vdev) {
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dp = of_get_next_child(cdev_node, NULL);
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while (dp) {
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if (!strcmp(dp->type, type))
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break;
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dp = of_get_next_child(cdev_node, dp);
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}
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} else {
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dp = to_vio_dev(parent)->dp;
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}
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vdev->dp = dp;
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printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
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err = device_register(&vdev->dev);
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if (err) {
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printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
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dev_name(&vdev->dev), err);
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kfree(vdev);
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return NULL;
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}
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if (vdev->dp)
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err = sysfs_create_file(&vdev->dev.kobj,
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&dev_attr_obppath.attr);
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return vdev;
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}
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static void vio_add(struct mdesc_handle *hp, u64 node)
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{
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(void) vio_create_one(hp, node, &root_vdev->dev);
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}
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static int vio_md_node_match(struct device *dev, void *arg)
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{
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struct vio_dev *vdev = to_vio_dev(dev);
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if (vdev->mp == (u64) arg)
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return 1;
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return 0;
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}
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static void vio_remove(struct mdesc_handle *hp, u64 node)
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{
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struct device *dev;
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dev = device_find_child(&root_vdev->dev, (void *) node,
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vio_md_node_match);
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if (dev) {
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printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
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device_unregister(dev);
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put_device(dev);
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}
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}
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static struct mdesc_notifier_client vio_device_notifier = {
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.add = vio_add,
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.remove = vio_remove,
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.node_name = "virtual-device-port",
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};
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/* We are only interested in domain service ports under the
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* "domain-services" node. On control nodes there is another port
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* under "openboot" that we should not mess with as aparently that is
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* reserved exclusively for OBP use.
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*/
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static void vio_add_ds(struct mdesc_handle *hp, u64 node)
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{
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int found;
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u64 a;
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found = 0;
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mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
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u64 target = mdesc_arc_target(hp, a);
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const char *name = mdesc_node_name(hp, target);
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if (!strcmp(name, "domain-services")) {
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found = 1;
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break;
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}
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}
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if (found)
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(void) vio_create_one(hp, node, &root_vdev->dev);
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}
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static struct mdesc_notifier_client vio_ds_notifier = {
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.add = vio_add_ds,
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.remove = vio_remove,
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.node_name = "domain-services-port",
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};
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static const char *channel_devices_node = "channel-devices";
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static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
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static const char *cfg_handle_prop = "cfg-handle";
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static int __init vio_init(void)
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{
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struct mdesc_handle *hp;
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const char *compat;
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const u64 *cfg_handle;
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int err, len;
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u64 root;
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err = bus_register(&vio_bus_type);
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if (err) {
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printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
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err);
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return err;
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}
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hp = mdesc_grab();
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if (!hp)
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return 0;
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root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
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if (root == MDESC_NODE_NULL) {
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printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
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mdesc_release(hp);
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return 0;
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}
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cdev_node = of_find_node_by_name(NULL, "channel-devices");
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err = -ENODEV;
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if (!cdev_node) {
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printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
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goto out_release;
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}
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compat = mdesc_get_property(hp, root, "compatible", &len);
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if (!compat) {
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printk(KERN_ERR "VIO: Channel devices lacks compatible "
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"property\n");
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goto out_release;
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}
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if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
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printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
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"compat entry.\n", channel_devices_compat);
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goto out_release;
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}
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cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
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if (!cfg_handle) {
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printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
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cfg_handle_prop);
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goto out_release;
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}
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cdev_cfg_handle = *cfg_handle;
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root_vdev = vio_create_one(hp, root, NULL);
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err = -ENODEV;
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if (!root_vdev) {
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printk(KERN_ERR "VIO: Could not create root device.\n");
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goto out_release;
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}
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mdesc_register_notifier(&vio_device_notifier);
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mdesc_register_notifier(&vio_ds_notifier);
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mdesc_release(hp);
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return err;
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out_release:
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mdesc_release(hp);
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return err;
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}
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postcore_initcall(vio_init);
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