linux/arch/sparc64/kernel/vio.c

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/* vio.c: Virtual I/O channel devices probing infrastructure.
*
* Copyright (c) 2003-2005 IBM Corp.
* Dave Engebretsen engebret@us.ibm.com
* Santiago Leon santil@us.ibm.com
* Hollis Blanchard <hollisb@us.ibm.com>
* Stephen Rothwell
*
* Adapted to sparc64 by David S. Miller davem@davemloft.net
*/
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <asm/mdesc.h>
#include <asm/vio.h>
static inline int find_in_proplist(const char *list, const char *match,
int len)
{
while (len > 0) {
int l;
if (!strcmp(list, match))
return 1;
l = strlen(list) + 1;
list += l;
len -= l;
}
return 0;
}
static const struct vio_device_id *vio_match_device(
const struct vio_device_id *matches,
const struct vio_dev *dev)
{
const char *type, *compat;
int len;
type = dev->type;
compat = dev->compat;
len = dev->compat_len;
while (matches->type[0] || matches->compat[0]) {
int match = 1;
if (matches->type[0]) {
match &= type
&& !strcmp(matches->type, type);
}
if (matches->compat[0]) {
match &= compat &&
find_in_proplist(compat, matches->compat, len);
}
if (match)
return matches;
matches++;
}
return NULL;
}
static int vio_bus_match(struct device *dev, struct device_driver *drv)
{
struct vio_dev *vio_dev = to_vio_dev(dev);
struct vio_driver *vio_drv = to_vio_driver(drv);
const struct vio_device_id *matches = vio_drv->id_table;
if (!matches)
return 0;
return vio_match_device(matches, vio_dev) != NULL;
}
static int vio_device_probe(struct device *dev)
{
struct vio_dev *vdev = to_vio_dev(dev);
struct vio_driver *drv = to_vio_driver(dev->driver);
const struct vio_device_id *id;
int error = -ENODEV;
if (drv->probe) {
id = vio_match_device(drv->id_table, vdev);
if (id)
error = drv->probe(vdev, id);
}
return error;
}
static int vio_device_remove(struct device *dev)
{
struct vio_dev *vdev = to_vio_dev(dev);
struct vio_driver *drv = to_vio_driver(dev->driver);
if (drv->remove)
return drv->remove(vdev);
return 1;
}
static ssize_t devspec_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vio_dev *vdev = to_vio_dev(dev);
const char *str = "none";
if (!strcmp(vdev->type, "network"))
str = "vnet";
else if (!strcmp(vdev->type, "block"))
str = "vdisk";
return sprintf(buf, "%s\n", str);
}
static ssize_t type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vio_dev *vdev = to_vio_dev(dev);
return sprintf(buf, "%s\n", vdev->type);
}
static struct device_attribute vio_dev_attrs[] = {
__ATTR_RO(devspec),
__ATTR_RO(type),
__ATTR_NULL
};
static struct bus_type vio_bus_type = {
.name = "vio",
.dev_attrs = vio_dev_attrs,
.match = vio_bus_match,
.probe = vio_device_probe,
.remove = vio_device_remove,
};
int vio_register_driver(struct vio_driver *viodrv)
{
viodrv->driver.bus = &vio_bus_type;
return driver_register(&viodrv->driver);
}
EXPORT_SYMBOL(vio_register_driver);
void vio_unregister_driver(struct vio_driver *viodrv)
{
driver_unregister(&viodrv->driver);
}
EXPORT_SYMBOL(vio_unregister_driver);
static void __devinit vio_dev_release(struct device *dev)
{
kfree(to_vio_dev(dev));
}
static ssize_t
show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vio_dev *vdev;
struct device_node *dp;
vdev = to_vio_dev(dev);
dp = vdev->dp;
return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
}
static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
show_pciobppath_attr, NULL);
struct device_node *cdev_node;
static struct vio_dev *root_vdev;
static u64 cdev_cfg_handle;
static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
struct vio_dev *vdev)
{
u64 a;
mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
const u64 *chan_id;
const u64 *irq;
u64 target;
target = mdesc_arc_target(hp, a);
irq = mdesc_get_property(hp, target, "tx-ino", NULL);
if (irq)
vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
irq = mdesc_get_property(hp, target, "rx-ino", NULL);
if (irq)
vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
chan_id = mdesc_get_property(hp, target, "id", NULL);
if (chan_id)
vdev->channel_id = *chan_id;
}
}
static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
struct device *parent)
{
const char *type, *compat;
struct device_node *dp;
struct vio_dev *vdev;
int err, clen;
type = mdesc_get_property(hp, mp, "device-type", NULL);
if (!type) {
type = mdesc_get_property(hp, mp, "name", NULL);
if (!type)
type = mdesc_node_name(hp, mp);
}
compat = mdesc_get_property(hp, mp, "device-type", &clen);
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
if (!vdev) {
printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
return NULL;
}
vdev->mp = mp;
vdev->type = type;
vdev->compat = compat;
vdev->compat_len = clen;
vdev->channel_id = ~0UL;
vdev->tx_irq = ~0;
vdev->rx_irq = ~0;
vio_fill_channel_info(hp, mp, vdev);
snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%lx", mp);
vdev->dev.parent = parent;
vdev->dev.bus = &vio_bus_type;
vdev->dev.release = vio_dev_release;
if (parent == NULL) {
dp = cdev_node;
} else if (to_vio_dev(parent) == root_vdev) {
dp = of_get_next_child(cdev_node, NULL);
while (dp) {
if (!strcmp(dp->type, type))
break;
dp = of_get_next_child(cdev_node, dp);
}
} else {
dp = to_vio_dev(parent)->dp;
}
vdev->dp = dp;
err = device_register(&vdev->dev);
if (err) {
printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
vdev->dev.bus_id, err);
kfree(vdev);
return NULL;
}
if (vdev->dp)
err = sysfs_create_file(&vdev->dev.kobj,
&dev_attr_obppath.attr);
return vdev;
}
static void walk_tree(struct mdesc_handle *hp, u64 n, struct vio_dev *parent)
{
u64 a;
mdesc_for_each_arc(a, hp, n, MDESC_ARC_TYPE_FWD) {
struct vio_dev *vdev;
u64 target;
target = mdesc_arc_target(hp, a);
vdev = vio_create_one(hp, target, &parent->dev);
if (vdev)
walk_tree(hp, target, vdev);
}
}
static void create_devices(struct mdesc_handle *hp, u64 root)
{
u64 mp;
root_vdev = vio_create_one(hp, root, NULL);
if (!root_vdev) {
printk(KERN_ERR "VIO: Coult not create root device.\n");
return;
}
walk_tree(hp, root, root_vdev);
/* Domain services is odd as it doesn't sit underneath the
* channel-devices node, so we plug it in manually.
*/
mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "domain-services");
if (mp != MDESC_NODE_NULL) {
struct vio_dev *parent = vio_create_one(hp, mp,
&root_vdev->dev);
if (parent)
walk_tree(hp, mp, parent);
}
}
const char *channel_devices_node = "channel-devices";
const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
const char *cfg_handle_prop = "cfg-handle";
static int __init vio_init(void)
{
struct mdesc_handle *hp;
const char *compat;
const u64 *cfg_handle;
int err, len;
u64 root;
hp = mdesc_grab();
if (!hp)
return 0;
root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
if (root == MDESC_NODE_NULL) {
printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
mdesc_release(hp);
return 0;
}
cdev_node = of_find_node_by_name(NULL, "channel-devices");
err = -ENODEV;
if (!cdev_node) {
printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
goto out_release;
}
compat = mdesc_get_property(hp, root, "compatible", &len);
if (!compat) {
printk(KERN_ERR "VIO: Channel devices lacks compatible "
"property\n");
goto out_release;
}
if (!find_in_proplist(compat, channel_devices_compat, len)) {
printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
"compat entry.\n", channel_devices_compat);
goto out_release;
}
cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
if (!cfg_handle) {
printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
cfg_handle_prop);
goto out_release;
}
cdev_cfg_handle = *cfg_handle;
err = bus_register(&vio_bus_type);
if (err) {
printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
err);
return err;
}
create_devices(hp, root);
mdesc_release(hp);
return 0;
out_release:
mdesc_release(hp);
return err;
}
postcore_initcall(vio_init);