linux/arch/sparc/kernel/vio.c
Greg Kroah-Hartman 2a81ada32f driver core: make struct bus_type.uevent() take a const *
The uevent() callback in struct bus_type should not be modifying the
device that is passed into it, so mark it as a const * and propagate the
function signature changes out into all relevant subsystems that use
this callback.

Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230111113018.459199-16-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-27 13:45:52 +01:00

574 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(const 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 void 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
*/
drv->remove(vdev);
}
}
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);