mirror of https://gitee.com/openkylin/linux.git
576 lines
13 KiB
C
576 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* 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/slab.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/export.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/mdesc.h>
|
|
#include <asm/vio.h>
|
|
|
|
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 &= !strcmp(matches->type, type);
|
|
|
|
if (matches->compat[0]) {
|
|
match &= len &&
|
|
of_find_in_proplist(compat, matches->compat, len);
|
|
}
|
|
if (match)
|
|
return matches;
|
|
matches++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
const struct vio_dev *vio_dev = to_vio_dev(dev);
|
|
|
|
add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
if (!drv->probe)
|
|
return -ENODEV;
|
|
|
|
id = vio_match_device(drv->id_table, vdev);
|
|
if (!id)
|
|
return -ENODEV;
|
|
|
|
/* alloc irqs (unless the driver specified not to) */
|
|
if (!drv->no_irq) {
|
|
if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL)
|
|
vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle,
|
|
vdev->tx_ino);
|
|
|
|
if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL)
|
|
vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle,
|
|
vdev->rx_ino);
|
|
}
|
|
|
|
return drv->probe(vdev, id);
|
|
}
|
|
|
|
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) {
|
|
/*
|
|
* Ideally, we would remove/deallocate tx/rx virqs
|
|
* here - however, there are currently no support
|
|
* routines to do so at the moment. TBD
|
|
*/
|
|
|
|
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, "vnet-port"))
|
|
str = "vnet";
|
|
else if (!strcmp(vdev->type, "vdc-port"))
|
|
str = "vdisk";
|
|
|
|
return sprintf(buf, "%s\n", str);
|
|
}
|
|
static DEVICE_ATTR_RO(devspec);
|
|
|
|
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 DEVICE_ATTR_RO(type);
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
const struct vio_dev *vdev = to_vio_dev(dev);
|
|
|
|
return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static struct attribute *vio_dev_attrs[] = {
|
|
&dev_attr_devspec.attr,
|
|
&dev_attr_type.attr,
|
|
&dev_attr_modalias.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(vio_dev);
|
|
|
|
static struct bus_type vio_bus_type = {
|
|
.name = "vio",
|
|
.dev_groups = vio_dev_groups,
|
|
.uevent = vio_hotplug,
|
|
.match = vio_bus_match,
|
|
.probe = vio_device_probe,
|
|
.remove = vio_device_remove,
|
|
};
|
|
|
|
int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
|
|
const char *mod_name)
|
|
{
|
|
viodrv->driver.bus = &vio_bus_type;
|
|
viodrv->driver.name = viodrv->name;
|
|
viodrv->driver.owner = owner;
|
|
viodrv->driver.mod_name = mod_name;
|
|
|
|
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 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 scnprintf(buf, PAGE_SIZE, "%pOF\n", dp);
|
|
}
|
|
|
|
static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
|
|
show_pciobppath_attr, NULL);
|
|
|
|
static struct device_node *cdev_node;
|
|
|
|
static struct vio_dev *root_vdev;
|
|
static u64 cdev_cfg_handle;
|
|
|
|
static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node)
|
|
{
|
|
const u64 *cfg_handle = NULL;
|
|
u64 a;
|
|
|
|
mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
|
|
u64 target;
|
|
|
|
target = mdesc_arc_target(hp, a);
|
|
cfg_handle = mdesc_get_property(hp, target,
|
|
"cfg-handle", NULL);
|
|
if (cfg_handle)
|
|
break;
|
|
}
|
|
|
|
return cfg_handle;
|
|
}
|
|
|
|
/**
|
|
* vio_vdev_node() - Find VDEV node in MD
|
|
* @hp: Handle to the MD
|
|
* @vdev: Pointer to VDEV
|
|
*
|
|
* Find the node in the current MD which matches the given vio_dev. This
|
|
* must be done dynamically since the node value can change if the MD
|
|
* is updated.
|
|
*
|
|
* NOTE: the MD must be locked, using mdesc_grab(), when calling this routine
|
|
*
|
|
* Return: The VDEV node in MDESC
|
|
*/
|
|
u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev)
|
|
{
|
|
u64 node;
|
|
|
|
if (vdev == NULL)
|
|
return MDESC_NODE_NULL;
|
|
|
|
node = mdesc_get_node(hp, (const char *)vdev->node_name,
|
|
&vdev->md_node_info);
|
|
|
|
return node;
|
|
}
|
|
EXPORT_SYMBOL(vio_vdev_node);
|
|
|
|
static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
|
|
struct vio_dev *vdev)
|
|
{
|
|
u64 a;
|
|
|
|
vdev->tx_ino = ~0UL;
|
|
vdev->rx_ino = ~0UL;
|
|
vdev->channel_id = ~0UL;
|
|
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_ino = *irq;
|
|
|
|
irq = mdesc_get_property(hp, target, "rx-ino", NULL);
|
|
if (irq)
|
|
vdev->rx_ino = *irq;
|
|
|
|
chan_id = mdesc_get_property(hp, target, "id", NULL);
|
|
if (chan_id)
|
|
vdev->channel_id = *chan_id;
|
|
}
|
|
|
|
vdev->cdev_handle = cdev_cfg_handle;
|
|
}
|
|
|
|
int vio_set_intr(unsigned long dev_ino, int state)
|
|
{
|
|
int err;
|
|
|
|
err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(vio_set_intr);
|
|
|
|
static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
|
|
const char *node_name,
|
|
struct device *parent)
|
|
{
|
|
const char *type, *compat;
|
|
struct device_node *dp;
|
|
struct vio_dev *vdev;
|
|
int err, tlen, clen;
|
|
const u64 *id, *cfg_handle;
|
|
|
|
type = mdesc_get_property(hp, mp, "device-type", &tlen);
|
|
if (!type) {
|
|
type = mdesc_get_property(hp, mp, "name", &tlen);
|
|
if (!type) {
|
|
type = mdesc_node_name(hp, mp);
|
|
tlen = strlen(type) + 1;
|
|
}
|
|
}
|
|
if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) {
|
|
printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
|
|
type);
|
|
return NULL;
|
|
}
|
|
|
|
id = mdesc_get_property(hp, mp, "id", NULL);
|
|
|
|
cfg_handle = vio_cfg_handle(hp, mp);
|
|
|
|
compat = mdesc_get_property(hp, mp, "device-type", &clen);
|
|
if (!compat) {
|
|
clen = 0;
|
|
} else if (clen > VIO_MAX_COMPAT_LEN) {
|
|
printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
|
|
clen, type);
|
|
return NULL;
|
|
}
|
|
|
|
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
|
|
if (!vdev) {
|
|
printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
|
|
return NULL;
|
|
}
|
|
|
|
vdev->mp = mp;
|
|
memcpy(vdev->type, type, tlen);
|
|
if (compat)
|
|
memcpy(vdev->compat, compat, clen);
|
|
else
|
|
memset(vdev->compat, 0, sizeof(vdev->compat));
|
|
vdev->compat_len = clen;
|
|
|
|
vdev->port_id = ~0UL;
|
|
vdev->tx_irq = 0;
|
|
vdev->rx_irq = 0;
|
|
|
|
vio_fill_channel_info(hp, mp, vdev);
|
|
|
|
if (!id) {
|
|
dev_set_name(&vdev->dev, "%s", type);
|
|
vdev->dev_no = ~(u64)0;
|
|
} else if (!cfg_handle) {
|
|
dev_set_name(&vdev->dev, "%s-%llu", type, *id);
|
|
vdev->dev_no = *id;
|
|
} else {
|
|
dev_set_name(&vdev->dev, "%s-%llu-%llu", type,
|
|
*cfg_handle, *id);
|
|
vdev->dev_no = *cfg_handle;
|
|
vdev->port_id = *id;
|
|
}
|
|
|
|
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) {
|
|
for_each_child_of_node(cdev_node, dp) {
|
|
if (of_node_is_type(dp, type))
|
|
break;
|
|
}
|
|
} else {
|
|
dp = to_vio_dev(parent)->dp;
|
|
}
|
|
vdev->dp = dp;
|
|
|
|
/*
|
|
* node_name is NULL for the parent/channel-devices node and
|
|
* the parent doesn't require the MD node info.
|
|
*/
|
|
if (node_name != NULL) {
|
|
(void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
|
|
node_name);
|
|
|
|
err = mdesc_get_node_info(hp, mp, node_name,
|
|
&vdev->md_node_info);
|
|
if (err) {
|
|
pr_err("VIO: Could not get MD node info %s, err=%d\n",
|
|
dev_name(&vdev->dev), err);
|
|
kfree(vdev);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",
|
|
dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);
|
|
|
|
err = device_register(&vdev->dev);
|
|
if (err) {
|
|
printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
|
|
dev_name(&vdev->dev), err);
|
|
put_device(&vdev->dev);
|
|
return NULL;
|
|
}
|
|
if (vdev->dp)
|
|
err = sysfs_create_file(&vdev->dev.kobj,
|
|
&dev_attr_obppath.attr);
|
|
|
|
return vdev;
|
|
}
|
|
|
|
static void vio_add(struct mdesc_handle *hp, u64 node,
|
|
const char *node_name)
|
|
{
|
|
(void) vio_create_one(hp, node, node_name, &root_vdev->dev);
|
|
}
|
|
|
|
struct vio_remove_node_data {
|
|
struct mdesc_handle *hp;
|
|
u64 node;
|
|
};
|
|
|
|
static int vio_md_node_match(struct device *dev, void *arg)
|
|
{
|
|
struct vio_dev *vdev = to_vio_dev(dev);
|
|
struct vio_remove_node_data *node_data;
|
|
u64 node;
|
|
|
|
node_data = (struct vio_remove_node_data *)arg;
|
|
|
|
node = vio_vdev_node(node_data->hp, vdev);
|
|
|
|
if (node == node_data->node)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
|
|
{
|
|
struct vio_remove_node_data node_data;
|
|
struct device *dev;
|
|
|
|
node_data.hp = hp;
|
|
node_data.node = node;
|
|
|
|
dev = device_find_child(&root_vdev->dev, (void *)&node_data,
|
|
vio_md_node_match);
|
|
if (dev) {
|
|
printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
|
|
|
|
device_unregister(dev);
|
|
put_device(dev);
|
|
} else {
|
|
pr_err("VIO: %s node not found in MDESC\n", node_name);
|
|
}
|
|
}
|
|
|
|
static struct mdesc_notifier_client vio_device_notifier = {
|
|
.add = vio_add,
|
|
.remove = vio_remove,
|
|
.node_name = "virtual-device-port",
|
|
};
|
|
|
|
/* We are only interested in domain service ports under the
|
|
* "domain-services" node. On control nodes there is another port
|
|
* under "openboot" that we should not mess with as aparently that is
|
|
* reserved exclusively for OBP use.
|
|
*/
|
|
static void vio_add_ds(struct mdesc_handle *hp, u64 node,
|
|
const char *node_name)
|
|
{
|
|
int found;
|
|
u64 a;
|
|
|
|
found = 0;
|
|
mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
|
|
u64 target = mdesc_arc_target(hp, a);
|
|
const char *name = mdesc_node_name(hp, target);
|
|
|
|
if (!strcmp(name, "domain-services")) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found)
|
|
(void) vio_create_one(hp, node, node_name, &root_vdev->dev);
|
|
}
|
|
|
|
static struct mdesc_notifier_client vio_ds_notifier = {
|
|
.add = vio_add_ds,
|
|
.remove = vio_remove,
|
|
.node_name = "domain-services-port",
|
|
};
|
|
|
|
static const char *channel_devices_node = "channel-devices";
|
|
static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
|
|
static 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;
|
|
|
|
err = bus_register(&vio_bus_type);
|
|
if (err) {
|
|
printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
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 (!of_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;
|
|
|
|
root_vdev = vio_create_one(hp, root, NULL, NULL);
|
|
err = -ENODEV;
|
|
if (!root_vdev) {
|
|
printk(KERN_ERR "VIO: Could not create root device.\n");
|
|
goto out_release;
|
|
}
|
|
|
|
mdesc_register_notifier(&vio_device_notifier);
|
|
mdesc_register_notifier(&vio_ds_notifier);
|
|
|
|
mdesc_release(hp);
|
|
|
|
return err;
|
|
|
|
out_release:
|
|
mdesc_release(hp);
|
|
return err;
|
|
}
|
|
|
|
postcore_initcall(vio_init);
|