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1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 | /* visorbus_main.c
*
* Copyright � 2010 - 2015 UNISYS CORPORATION
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*/
#include <linux/uuid.h>
#include "visorbus.h"
#include "visorbus_private.h"
#include "version.h"
#include "periodic_work.h"
#include "vbuschannel.h"
#include "guestlinuxdebug.h"
#include "vmcallinterface.h"
#define MYDRVNAME "visorbus"
/* module parameters */
static int visorbus_debug;
static int visorbus_forcematch;
static int visorbus_forcenomatch;
static int visorbus_debugref;
#define SERIALLOOPBACKCHANADDR (100 * 1024 * 1024)
#define CURRENT_FILE_PC VISOR_BUS_PC_visorbus_main_c
#define POLLJIFFIES_TESTWORK 100
#define POLLJIFFIES_NORMALCHANNEL 10
static int busreg_rc = -ENODEV; /* stores the result from bus registration */
static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env);
static int visorbus_match(struct device *xdev, struct device_driver *xdrv);
static void fix_vbus_dev_info(struct visor_device *visordev);
/* BUS type attributes
*
* define & implement display of bus attributes under
* /sys/bus/visorbus.
*
*/
static ssize_t version_show(struct bus_type *bus, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", VERSION);
}
static BUS_ATTR_RO(version);
static struct attribute *visorbus_bus_attrs[] = {
&bus_attr_version.attr,
NULL,
};
static const struct attribute_group visorbus_bus_group = {
.attrs = visorbus_bus_attrs,
};
static const struct attribute_group *visorbus_bus_groups[] = {
&visorbus_bus_group,
NULL,
};
/*
* DEVICE type attributes
*
* The modalias file will contain the guid of the device.
*/
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct visor_device *vdev;
uuid_le guid;
vdev = to_visor_device(dev);
guid = visorchannel_get_uuid(vdev->visorchannel);
return snprintf(buf, PAGE_SIZE, "visorbus:%pUl\n", &guid);
}
static DEVICE_ATTR_RO(modalias);
static struct attribute *visorbus_dev_attrs[] = {
&dev_attr_modalias.attr,
NULL,
};
/* sysfs example for bridge-only sysfs files using device_type's */
static const struct attribute_group visorbus_dev_group = {
.attrs = visorbus_dev_attrs,
};
static const struct attribute_group *visorbus_dev_groups[] = {
&visorbus_dev_group,
NULL,
};
/** This describes the TYPE of bus.
* (Don't confuse this with an INSTANCE of the bus.)
*/
struct bus_type visorbus_type = {
.name = "visorbus",
.match = visorbus_match,
.uevent = visorbus_uevent,
.dev_groups = visorbus_dev_groups,
.bus_groups = visorbus_bus_groups,
};
static struct delayed_work periodic_work;
/* YES, we need 2 workqueues.
* The reason is, workitems on the test queue may need to cancel
* workitems on the other queue. You will be in for trouble if you try to
* do this with workitems queued on the same workqueue.
*/
static struct workqueue_struct *periodic_test_workqueue;
static struct workqueue_struct *periodic_dev_workqueue;
static long long bus_count; /** number of bus instances */
/** ever-increasing */
static void chipset_bus_create(struct visor_device *bus_info);
static void chipset_bus_destroy(struct visor_device *bus_info);
static void chipset_device_create(struct visor_device *dev_info);
static void chipset_device_destroy(struct visor_device *dev_info);
static void chipset_device_pause(struct visor_device *dev_info);
static void chipset_device_resume(struct visor_device *dev_info);
/** These functions are implemented herein, and are called by the chipset
* driver to notify us about specific events.
*/
static struct visorchipset_busdev_notifiers chipset_notifiers = {
.bus_create = chipset_bus_create,
.bus_destroy = chipset_bus_destroy,
.device_create = chipset_device_create,
.device_destroy = chipset_device_destroy,
.device_pause = chipset_device_pause,
.device_resume = chipset_device_resume,
};
/** These functions are implemented in the chipset driver, and we call them
* herein when we want to acknowledge a specific event.
*/
static struct visorchipset_busdev_responders chipset_responders;
/* filled in with info about parent chipset driver when we register with it */
static struct ultra_vbus_deviceinfo chipset_driverinfo;
/* filled in with info about this driver, wrt it servicing client busses */
static struct ultra_vbus_deviceinfo clientbus_driverinfo;
/** list of visor_device structs, linked via .list_all */
static LIST_HEAD(list_all_bus_instances);
/** list of visor_device structs, linked via .list_all */
static LIST_HEAD(list_all_device_instances);
static int
visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env)
{
struct visor_device *dev;
uuid_le guid;
dev = to_visor_device(xdev);
guid = visorchannel_get_uuid(dev->visorchannel);
if (add_uevent_var(env, "MODALIAS=visorbus:%pUl", &guid))
return -ENOMEM;
return 0;
}
/* This is called automatically upon adding a visor_device (device_add), or
* adding a visor_driver (visorbus_register_visor_driver), and returns 1 iff the
* provided driver can control the specified device.
*/
static int
visorbus_match(struct device *xdev, struct device_driver *xdrv)
{
uuid_le channel_type;
int rc = 0;
int i;
struct visor_device *dev;
struct visor_driver *drv;
dev = to_visor_device(xdev);
drv = to_visor_driver(xdrv);
channel_type = visorchannel_get_uuid(dev->visorchannel);
if (visorbus_forcematch) {
rc = 1;
goto away;
}
if (visorbus_forcenomatch)
goto away;
if (!drv->channel_types)
goto away;
for (i = 0;
(uuid_le_cmp(drv->channel_types[i].guid, NULL_UUID_LE) != 0) ||
(drv->channel_types[i].name);
i++)
if (uuid_le_cmp(drv->channel_types[i].guid,
channel_type) == 0) {
rc = i + 1;
goto away;
}
away:
return rc;
}
/** This is called when device_unregister() is called for the bus device
* instance, after all other tasks involved with destroying the device
* are complete.
*/
static void
visorbus_release_busdevice(struct device *xdev)
{
struct visor_device *dev = dev_get_drvdata(xdev);
dev_set_drvdata(xdev, NULL);
kfree(dev);
}
/** This is called when device_unregister() is called for each child
* device instance.
*/
static void
visorbus_release_device(struct device *xdev)
{
struct visor_device *dev = to_visor_device(xdev);
if (dev->periodic_work) {
visor_periodic_work_destroy(dev->periodic_work);
dev->periodic_work = NULL;
}
if (dev->visorchannel) {
visorchannel_destroy(dev->visorchannel);
dev->visorchannel = NULL;
}
kfree(dev);
}
/* Implement publishing of device node attributes under:
*
* /sys/bus/visorbus<x>/dev<y>/devmajorminor
*
*/
#define to_devmajorminor_attr(_attr) \
container_of(_attr, struct devmajorminor_attribute, attr)
#define to_visor_device_from_kobjdevmajorminor(obj) \
container_of(obj, struct visor_device, kobjdevmajorminor)
struct devmajorminor_attribute {
struct attribute attr;
int slot;
ssize_t (*show)(struct visor_device *, int slot, char *buf);
ssize_t (*store)(struct visor_device *, int slot, const char *buf,
size_t count);
};
static ssize_t DEVMAJORMINOR_ATTR(struct visor_device *dev, int slot, char *buf)
{
int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]);
if (slot < 0 || slot >= maxdevnodes)
return 0;
return snprintf(buf, PAGE_SIZE, "%d:%d\n",
dev->devnodes[slot].major, dev->devnodes[slot].minor);
}
static ssize_t
devmajorminor_attr_show(struct kobject *kobj, struct attribute *attr, char *buf)
{
struct devmajorminor_attribute *devmajorminor_attr =
to_devmajorminor_attr(attr);
struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj);
ssize_t ret = 0;
if (devmajorminor_attr->show)
ret = devmajorminor_attr->show(dev,
devmajorminor_attr->slot, buf);
return ret;
}
static ssize_t
devmajorminor_attr_store(struct kobject *kobj,
struct attribute *attr, const char *buf, size_t count)
{
struct devmajorminor_attribute *devmajorminor_attr =
to_devmajorminor_attr(attr);
struct visor_device *dev = to_visor_device_from_kobjdevmajorminor(kobj);
ssize_t ret = 0;
if (devmajorminor_attr->store)
ret = devmajorminor_attr->store(dev,
devmajorminor_attr->slot,
buf, count);
return ret;
}
static int register_devmajorminor_attributes(struct visor_device *dev);
static int
devmajorminor_create_file(struct visor_device *dev, const char *name,
int major, int minor)
{
int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]);
struct devmajorminor_attribute *myattr = NULL;
int x = -1, rc = 0, slot = -1;
register_devmajorminor_attributes(dev);
for (slot = 0; slot < maxdevnodes; slot++)
if (!dev->devnodes[slot].attr)
break;
if (slot == maxdevnodes) {
rc = -ENOMEM;
goto away;
}
myattr = kzalloc(sizeof(*myattr), GFP_KERNEL);
if (!myattr) {
rc = -ENOMEM;
goto away;
}
myattr->show = DEVMAJORMINOR_ATTR;
myattr->store = NULL;
myattr->slot = slot;
myattr->attr.name = name;
myattr->attr.mode = S_IRUGO;
dev->devnodes[slot].attr = myattr;
dev->devnodes[slot].major = major;
dev->devnodes[slot].minor = minor;
x = sysfs_create_file(&dev->kobjdevmajorminor, &myattr->attr);
if (x < 0) {
rc = x;
goto away;
}
kobject_uevent(&dev->device.kobj, KOBJ_ONLINE);
away:
if (rc < 0) {
kfree(myattr);
myattr = NULL;
dev->devnodes[slot].attr = NULL;
}
return rc;
}
static void
devmajorminor_remove_file(struct visor_device *dev, int slot)
{
int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]);
struct devmajorminor_attribute *myattr = NULL;
if (slot < 0 || slot >= maxdevnodes)
return;
myattr = (struct devmajorminor_attribute *)(dev->devnodes[slot].attr);
if (!myattr)
return;
sysfs_remove_file(&dev->kobjdevmajorminor, &myattr->attr);
kobject_uevent(&dev->device.kobj, KOBJ_OFFLINE);
dev->devnodes[slot].attr = NULL;
kfree(myattr);
}
static void
devmajorminor_remove_all_files(struct visor_device *dev)
{
int i = 0;
int maxdevnodes = ARRAY_SIZE(dev->devnodes) / sizeof(dev->devnodes[0]);
for (i = 0; i < maxdevnodes; i++)
devmajorminor_remove_file(dev, i);
}
static const struct sysfs_ops devmajorminor_sysfs_ops = {
.show = devmajorminor_attr_show,
.store = devmajorminor_attr_store,
};
static struct kobj_type devmajorminor_kobj_type = {
.sysfs_ops = &devmajorminor_sysfs_ops
};
static int
register_devmajorminor_attributes(struct visor_device *dev)
{
int rc = 0, x = 0;
if (dev->kobjdevmajorminor.parent)
goto away; /* already registered */
x = kobject_init_and_add(&dev->kobjdevmajorminor,
&devmajorminor_kobj_type, &dev->device.kobj,
"devmajorminor");
if (x < 0) {
rc = x;
goto away;
}
kobject_uevent(&dev->kobjdevmajorminor, KOBJ_ADD);
away:
return rc;
}
static void
unregister_devmajorminor_attributes(struct visor_device *dev)
{
if (!dev->kobjdevmajorminor.parent)
return; /* already unregistered */
devmajorminor_remove_all_files(dev);
kobject_del(&dev->kobjdevmajorminor);
kobject_put(&dev->kobjdevmajorminor);
dev->kobjdevmajorminor.parent = NULL;
}
/* begin implementation of specific channel attributes to appear under
* /sys/bus/visorbus<x>/dev<y>/channel
*/
static ssize_t physaddr_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct visor_device *vdev = to_visor_device(dev);
if (!vdev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "0x%Lx\n",
visorchannel_get_physaddr(vdev->visorchannel));
}
static ssize_t nbytes_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct visor_device *vdev = to_visor_device(dev);
if (!vdev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "0x%lx\n",
visorchannel_get_nbytes(vdev->visorchannel));
}
static ssize_t clientpartition_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct visor_device *vdev = to_visor_device(dev);
if (!vdev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "0x%Lx\n",
visorchannel_get_clientpartition(vdev->visorchannel));
}
static ssize_t typeguid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct visor_device *vdev = to_visor_device(dev);
char s[99];
if (!vdev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "%s\n",
visorchannel_id(vdev->visorchannel, s));
}
static ssize_t zoneguid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct visor_device *vdev = to_visor_device(dev);
char s[99];
if (!vdev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "%s\n",
visorchannel_zoneid(vdev->visorchannel, s));
}
static ssize_t typename_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct visor_device *vdev = to_visor_device(dev);
int i = 0;
struct bus_type *xbus = dev->bus;
struct device_driver *xdrv = dev->driver;
struct visor_driver *drv = NULL;
if (!vdev->visorchannel || !xbus || !xdrv)
return 0;
i = xbus->match(dev, xdrv);
if (!i)
return 0;
drv = to_visor_driver(xdrv);
return snprintf(buf, PAGE_SIZE, "%s\n", drv->channel_types[i - 1].name);
}
static DEVICE_ATTR_RO(physaddr);
static DEVICE_ATTR_RO(nbytes);
static DEVICE_ATTR_RO(clientpartition);
static DEVICE_ATTR_RO(typeguid);
static DEVICE_ATTR_RO(zoneguid);
static DEVICE_ATTR_RO(typename);
static struct attribute *channel_attrs[] = {
&dev_attr_physaddr.attr,
&dev_attr_nbytes.attr,
&dev_attr_clientpartition.attr,
&dev_attr_typeguid.attr,
&dev_attr_zoneguid.attr,
&dev_attr_typename.attr,
NULL
};
static struct attribute_group channel_attr_grp = {
.name = "channel",
.attrs = channel_attrs,
};
static const struct attribute_group *visorbus_channel_groups[] = {
&channel_attr_grp,
NULL
};
/* end implementation of specific channel attributes */
/* BUS instance attributes
*
* define & implement display of bus attributes under
* /sys/bus/visorbus/busses/visorbus<n>.
*
* This is a bit hoaky because the kernel does not yet have the infrastructure
* to separate bus INSTANCE attributes from bus TYPE attributes...
* so we roll our own. See businst.c / businst.h.
*
*/
static ssize_t partition_handle_show(struct device *dev,
struct device_attribute *attr,
char *buf) {
struct visor_device *vdev = to_visor_device(dev);
u64 handle = visorchannel_get_clientpartition(vdev->visorchannel);
return snprintf(buf, PAGE_SIZE, "0x%Lx\n", handle);
}
static ssize_t partition_guid_show(struct device *dev,
struct device_attribute *attr,
char *buf) {
struct visor_device *vdev = to_visor_device(dev);
return snprintf(buf, PAGE_SIZE, "{%pUb}\n", &vdev->partition_uuid);
}
static ssize_t partition_name_show(struct device *dev,
struct device_attribute *attr,
char *buf) {
struct visor_device *vdev = to_visor_device(dev);
return snprintf(buf, PAGE_SIZE, "%s\n", vdev->name);
}
static ssize_t channel_addr_show(struct device *dev,
struct device_attribute *attr,
char *buf) {
struct visor_device *vdev = to_visor_device(dev);
u64 addr = visorchannel_get_physaddr(vdev->visorchannel);
return snprintf(buf, PAGE_SIZE, "0x%Lx\n", addr);
}
static ssize_t channel_bytes_show(struct device *dev,
struct device_attribute *attr,
char *buf) {
struct visor_device *vdev = to_visor_device(dev);
u64 nbytes = visorchannel_get_nbytes(vdev->visorchannel);
return snprintf(buf, PAGE_SIZE, "0x%Lx\n", nbytes);
}
static ssize_t channel_id_show(struct device *dev,
struct device_attribute *attr,
char *buf) {
struct visor_device *vdev = to_visor_device(dev);
int len = 0;
if (vdev->visorchannel) {
visorchannel_id(vdev->visorchannel, buf);
len = strlen(buf);
buf[len++] = '\n';
}
return len;
}
static ssize_t client_bus_info_show(struct device *dev,
struct device_attribute *attr,
char *buf) {
struct visor_device *vdev = to_visor_device(dev);
struct visorchannel *channel = vdev->visorchannel;
int i, x, remain = PAGE_SIZE;
unsigned long off;
char *p = buf;
u8 *partition_name;
struct ultra_vbus_deviceinfo dev_info;
partition_name = "";
if (channel) {
if (vdev->name)
partition_name = vdev->name;
x = snprintf(p, remain,
"Client device / client driver info for %s partition (vbus #%d):\n",
partition_name, vdev->chipset_dev_no);
p += x;
remain -= x;
x = visorchannel_read(channel,
offsetof(struct
spar_vbus_channel_protocol,
chp_info),
&dev_info, sizeof(dev_info));
if (x >= 0) {
x = vbuschannel_devinfo_to_string(&dev_info, p,
remain, -1);
p += x;
remain -= x;
}
x = visorchannel_read(channel,
offsetof(struct
spar_vbus_channel_protocol,
bus_info),
&dev_info, sizeof(dev_info));
if (x >= 0) {
x = vbuschannel_devinfo_to_string(&dev_info, p,
remain, -1);
p += x;
remain -= x;
}
off = offsetof(struct spar_vbus_channel_protocol, dev_info);
i = 0;
while (off + sizeof(dev_info) <=
visorchannel_get_nbytes(channel)) {
x = visorchannel_read(channel,
off, &dev_info, sizeof(dev_info));
if (x >= 0) {
x = vbuschannel_devinfo_to_string
(&dev_info, p, remain, i);
p += x;
remain -= x;
}
off += sizeof(dev_info);
i++;
}
}
return PAGE_SIZE - remain;
}
static DEVICE_ATTR_RO(partition_handle);
static DEVICE_ATTR_RO(partition_guid);
static DEVICE_ATTR_RO(partition_name);
static DEVICE_ATTR_RO(channel_addr);
static DEVICE_ATTR_RO(channel_bytes);
static DEVICE_ATTR_RO(channel_id);
static DEVICE_ATTR_RO(client_bus_info);
static struct attribute *dev_attrs[] = {
&dev_attr_partition_handle.attr,
&dev_attr_partition_guid.attr,
&dev_attr_partition_name.attr,
&dev_attr_channel_addr.attr,
&dev_attr_channel_bytes.attr,
&dev_attr_channel_id.attr,
&dev_attr_client_bus_info.attr,
NULL
};
static struct attribute_group dev_attr_grp = {
.attrs = dev_attrs,
};
static const struct attribute_group *visorbus_groups[] = {
&dev_attr_grp,
NULL
};
/* DRIVER attributes
*
* define & implement display of driver attributes under
* /sys/bus/visorbus/drivers/<drivername>.
*
*/
static ssize_t
DRIVER_ATTR_version(struct device_driver *xdrv, char *buf)
{
struct visor_driver *drv = to_visor_driver(xdrv);
return snprintf(buf, PAGE_SIZE, "%s\n", drv->version);
}
static int
register_driver_attributes(struct visor_driver *drv)
{
int rc;
struct driver_attribute version =
__ATTR(version, S_IRUGO, DRIVER_ATTR_version, NULL);
drv->version_attr = version;
rc = driver_create_file(&drv->driver, &drv->version_attr);
return rc;
}
static void
unregister_driver_attributes(struct visor_driver *drv)
{
driver_remove_file(&drv->driver, &drv->version_attr);
}
static void
dev_periodic_work(void *xdev)
{
struct visor_device *dev = xdev;
struct visor_driver *drv = to_visor_driver(dev->device.driver);
down(&dev->visordriver_callback_lock);
if (drv->channel_interrupt)
drv->channel_interrupt(dev);
up(&dev->visordriver_callback_lock);
if (!visor_periodic_work_nextperiod(dev->periodic_work))
put_device(&dev->device);
}
static void
dev_start_periodic_work(struct visor_device *dev)
{
if (dev->being_removed)
return;
/* now up by at least 2 */
get_device(&dev->device);
if (!visor_periodic_work_start(dev->periodic_work))
put_device(&dev->device);
}
static void
dev_stop_periodic_work(struct visor_device *dev)
{
if (visor_periodic_work_stop(dev->periodic_work))
put_device(&dev->device);
}
/** This is called automatically upon adding a visor_device (device_add), or
* adding a visor_driver (visorbus_register_visor_driver), but only after
* visorbus_match has returned 1 to indicate a successful match between
* driver and device.
*/
static int
visordriver_probe_device(struct device *xdev)
{
int rc;
struct visor_driver *drv;
struct visor_device *dev;
drv = to_visor_driver(xdev->driver);
dev = to_visor_device(xdev);
down(&dev->visordriver_callback_lock);
dev->being_removed = false;
/*
* ensure that the dev->being_removed flag is cleared before
* we start the probe
*/
wmb();
get_device(&dev->device);
if (!drv->probe) {
up(&dev->visordriver_callback_lock);
rc = -1;
goto away;
}
rc = drv->probe(dev);
if (rc < 0)
goto away;
fix_vbus_dev_info(dev);
up(&dev->visordriver_callback_lock);
rc = 0;
away:
if (rc != 0)
put_device(&dev->device);
return rc;
}
/** This is called when device_unregister() is called for each child device
* instance, to notify the appropriate visorbus_driver that the device is
* going away, and to decrease the reference count of the device.
*/
static int
visordriver_remove_device(struct device *xdev)
{
struct visor_device *dev;
struct visor_driver *drv;
dev = to_visor_device(xdev);
drv = to_visor_driver(xdev->driver);
down(&dev->visordriver_callback_lock);
dev->being_removed = true;
/*
* ensure that the dev->being_removed flag is set before we start the
* actual removal
*/
wmb();
if (drv) {
if (drv->remove)
drv->remove(dev);
}
up(&dev->visordriver_callback_lock);
dev_stop_periodic_work(dev);
devmajorminor_remove_all_files(dev);
put_device(&dev->device);
return 0;
}
/** A particular type of visor driver calls this function to register
* the driver. The caller MUST fill in the following fields within the
* #drv structure:
* name, version, owner, channel_types, probe, remove
*
* Here's how the whole Linux bus / driver / device model works.
*
* At system start-up, the visorbus kernel module is loaded, which registers
* visorbus_type as a bus type, using bus_register().
*
* All kernel modules that support particular device types on a
* visorbus bus are loaded. Each of these kernel modules calls
* visorbus_register_visor_driver() in their init functions, passing a
* visor_driver struct. visorbus_register_visor_driver() in turn calls
* register_driver(&visor_driver.driver). This .driver member is
* initialized with generic methods (like probe), whose sole responsibility
* is to act as a broker for the real methods, which are within the
* visor_driver struct. (This is the way the subclass behavior is
* implemented, since visor_driver is essentially a subclass of the
* generic driver.) Whenever a driver_register() happens, core bus code in
* the kernel does (see device_attach() in drivers/base/dd.c):
*
* for each dev associated with the bus (the bus that driver is on) that
* does not yet have a driver
* if bus.match(dev,newdriver) == yes_matched ** .match specified
* ** during bus_register().
* newdriver.probe(dev) ** for visor drivers, this will call
* ** the generic driver.probe implemented in visorbus.c,
* ** which in turn calls the probe specified within the
* ** struct visor_driver (which was specified by the
* ** actual device driver as part of
* ** visorbus_register_visor_driver()).
*
* The above dance also happens when a new device appears.
* So the question is, how are devices created within the system?
* Basically, just call device_add(dev). See pci_bus_add_devices().
* pci_scan_device() shows an example of how to build a device struct. It
* returns the newly-created struct to pci_scan_single_device(), who adds it
* to the list of devices at PCIBUS.devices. That list of devices is what
* is traversed by pci_bus_add_devices().
*
*/
int visorbus_register_visor_driver(struct visor_driver *drv)
{
int rc = 0;
if (busreg_rc < 0)
return -ENODEV; /*can't register on a nonexistent bus*/
drv->driver.name = drv->name;
drv->driver.bus = &visorbus_type;
drv->driver.probe = visordriver_probe_device;
drv->driver.remove = visordriver_remove_device;
drv->driver.owner = drv->owner;
/* driver_register does this:
* bus_add_driver(drv)
* ->if (drv.bus) ** (bus_type) **
* driver_attach(drv)
* for each dev with bus type of drv.bus
* if (!dev.drv) ** no driver assigned yet **
* if (bus.match(dev,drv)) [visorbus_match]
* dev.drv = drv
* if (!drv.probe(dev)) [visordriver_probe_device]
* dev.drv = NULL
*/
rc = driver_register(&drv->driver);
if (rc < 0)
return rc;
rc = register_driver_attributes(drv);
if (rc < 0)
driver_unregister(&drv->driver);
return rc;
}
EXPORT_SYMBOL_GPL(visorbus_register_visor_driver);
/** A particular type of visor driver calls this function to unregister
* the driver, i.e., within its module_exit function.
*/
void
visorbus_unregister_visor_driver(struct visor_driver *drv)
{
unregister_driver_attributes(drv);
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver);
int
visorbus_read_channel(struct visor_device *dev, unsigned long offset,
void *dest, unsigned long nbytes)
{
return visorchannel_read(dev->visorchannel, offset, dest, nbytes);
}
EXPORT_SYMBOL_GPL(visorbus_read_channel);
int
visorbus_write_channel(struct visor_device *dev, unsigned long offset,
void *src, unsigned long nbytes)
{
return visorchannel_write(dev->visorchannel, offset, src, nbytes);
}
EXPORT_SYMBOL_GPL(visorbus_write_channel);
int
visorbus_clear_channel(struct visor_device *dev, unsigned long offset, u8 ch,
unsigned long nbytes)
{
return visorchannel_clear(dev->visorchannel, offset, ch, nbytes);
}
EXPORT_SYMBOL_GPL(visorbus_clear_channel);
int
visorbus_registerdevnode(struct visor_device *dev,
const char *name, int major, int minor)
{
return devmajorminor_create_file(dev, name, major, minor);
}
EXPORT_SYMBOL_GPL(visorbus_registerdevnode);
/** We don't really have a real interrupt, so for now we just call the
* interrupt function periodically...
*/
void
visorbus_enable_channel_interrupts(struct visor_device *dev)
{
dev_start_periodic_work(dev);
}
EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts);
void
visorbus_disable_channel_interrupts(struct visor_device *dev)
{
dev_stop_periodic_work(dev);
}
EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts);
/** This is how everything starts from the device end.
* This function is called when a channel first appears via a ControlVM
* message. In response, this function allocates a visor_device to
* correspond to the new channel, and attempts to connect it the appropriate
* driver. If the appropriate driver is found, the visor_driver.probe()
* function for that driver will be called, and will be passed the new
* visor_device that we just created.
*
* It's ok if the appropriate driver is not yet loaded, because in that case
* the new device struct will just stick around in the bus' list of devices.
* When the appropriate driver calls visorbus_register_visor_driver(), the
* visor_driver.probe() for the new driver will be called with the new
* device.
*/
static int
create_visor_device(struct visor_device *dev)
{
int rc = -1;
u32 chipset_bus_no = dev->chipset_bus_no;
u32 chipset_dev_no = dev->chipset_dev_no;
POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, chipset_dev_no, chipset_bus_no,
POSTCODE_SEVERITY_INFO);
sema_init(&dev->visordriver_callback_lock, 1); /* unlocked */
dev->device.bus = &visorbus_type;
dev->device.groups = visorbus_channel_groups;
device_initialize(&dev->device);
dev->device.release = visorbus_release_device;
/* keep a reference just for us (now 2) */
get_device(&dev->device);
dev->periodic_work =
visor_periodic_work_create(POLLJIFFIES_NORMALCHANNEL,
periodic_dev_workqueue,
dev_periodic_work,
dev, dev_name(&dev->device));
if (!dev->periodic_work) {
POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, chipset_dev_no,
DIAG_SEVERITY_ERR);
goto away;
}
/* bus_id must be a unique name with respect to this bus TYPE
* (NOT bus instance). That's why we need to include the bus
* number within the name.
*/
dev_set_name(&dev->device, "vbus%u:dev%u",
chipset_bus_no, chipset_dev_no);
/* device_add does this:
* bus_add_device(dev)
* ->device_attach(dev)
* ->for each driver drv registered on the bus that dev is on
* if (dev.drv) ** device already has a driver **
* ** not sure we could ever get here... **
* else
* if (bus.match(dev,drv)) [visorbus_match]
* dev.drv = drv
* if (!drv.probe(dev)) [visordriver_probe_device]
* dev.drv = NULL
*
* Note that device_add does NOT fail if no driver failed to
* claim the device. The device will be linked onto
* bus_type.klist_devices regardless (use bus_for_each_dev).
*/
rc = device_add(&dev->device);
if (rc < 0) {
POSTCODE_LINUX_3(DEVICE_ADD_PC, chipset_bus_no,
DIAG_SEVERITY_ERR);
goto away;
}
rc = register_devmajorminor_attributes(dev);
if (rc < 0) {
POSTCODE_LINUX_3(DEVICE_REGISTER_FAILURE_PC, chipset_dev_no,
DIAG_SEVERITY_ERR);
goto away_register;
}
list_add_tail(&dev->list_all, &list_all_device_instances);
return 0;
away_register:
device_unregister(&dev->device);
away:
put_device(&dev->device);
return rc;
}
static void
remove_visor_device(struct visor_device *dev)
{
list_del(&dev->list_all);
unregister_devmajorminor_attributes(dev);
put_device(&dev->device);
device_unregister(&dev->device);
}
static int
get_vbus_header_info(struct visorchannel *chan,
struct spar_vbus_headerinfo *hdr_info)
{
int rc = -1;
if (!SPAR_VBUS_CHANNEL_OK_CLIENT(visorchannel_get_header(chan)))
goto away;
if (visorchannel_read(chan, sizeof(struct channel_header), hdr_info,
sizeof(*hdr_info)) < 0) {
goto away;
}
if (hdr_info->struct_bytes < sizeof(struct spar_vbus_headerinfo))
goto away;
if (hdr_info->device_info_struct_bytes <
sizeof(struct ultra_vbus_deviceinfo)) {
goto away;
}
rc = 0;
away:
return rc;
}
/* Write the contents of <info> to the struct
* spar_vbus_channel_protocol.chp_info. */
static int
write_vbus_chp_info(struct visorchannel *chan,
struct spar_vbus_headerinfo *hdr_info,
struct ultra_vbus_deviceinfo *info)
{
int off = sizeof(struct channel_header) + hdr_info->chp_info_offset;
if (hdr_info->chp_info_offset == 0)
return -1;
if (visorchannel_write(chan, off, info, sizeof(*info)) < 0)
return -1;
return 0;
}
/* Write the contents of <info> to the struct
* spar_vbus_channel_protocol.bus_info. */
static int
write_vbus_bus_info(struct visorchannel *chan,
struct spar_vbus_headerinfo *hdr_info,
struct ultra_vbus_deviceinfo *info)
{
int off = sizeof(struct channel_header) + hdr_info->bus_info_offset;
if (hdr_info->bus_info_offset == 0)
return -1;
if (visorchannel_write(chan, off, info, sizeof(*info)) < 0)
return -1;
return 0;
}
/* Write the contents of <info> to the
* struct spar_vbus_channel_protocol.dev_info[<devix>].
*/
static int
write_vbus_dev_info(struct visorchannel *chan,
struct spar_vbus_headerinfo *hdr_info,
struct ultra_vbus_deviceinfo *info, int devix)
{
int off =
(sizeof(struct channel_header) + hdr_info->dev_info_offset) +
(hdr_info->device_info_struct_bytes * devix);
if (hdr_info->dev_info_offset == 0)
return -1;
if (visorchannel_write(chan, off, info, sizeof(*info)) < 0)
return -1;
return 0;
}
/* For a child device just created on a client bus, fill in
* information about the driver that is controlling this device into
* the the appropriate slot within the vbus channel of the bus
* instance.
*/
static void
fix_vbus_dev_info(struct visor_device *visordev)
{
int i;
struct visor_device *bdev;
struct visor_driver *visordrv;
int bus_no = visordev->chipset_bus_no;
int dev_no = visordev->chipset_dev_no;
struct ultra_vbus_deviceinfo dev_info;
const char *chan_type_name = NULL;
struct spar_vbus_headerinfo *hdr_info;
if (!visordev->device.driver)
return;
hdr_info = (struct spar_vbus_headerinfo *)visordev->vbus_hdr_info;
if (!hdr_info)
return;
bdev = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
if (!bdev)
return;
visordrv = to_visor_driver(visordev->device.driver);
/* Within the list of device types (by GUID) that the driver
* says it supports, find out which one of those types matches
* the type of this device, so that we can include the device
* type name
*/
for (i = 0; visordrv->channel_types[i].name; i++) {
if (memcmp(&visordrv->channel_types[i].guid,
&visordev->channel_type_guid,
sizeof(visordrv->channel_types[i].guid)) == 0) {
chan_type_name = visordrv->channel_types[i].name;
break;
}
}
bus_device_info_init(&dev_info, chan_type_name,
visordrv->name, visordrv->version,
visordrv->vertag);
write_vbus_dev_info(bdev->visorchannel, hdr_info, &dev_info, dev_no);
/* Re-write bus+chipset info, because it is possible that this
* was previously written by our evil counterpart, virtpci.
*/
write_vbus_chp_info(bdev->visorchannel, hdr_info, &chipset_driverinfo);
write_vbus_bus_info(bdev->visorchannel, hdr_info,
&clientbus_driverinfo);
}
/** Create a device instance for the visor bus itself.
*/
static int
create_bus_instance(struct visor_device *dev)
{
int rc;
int id = dev->chipset_bus_no;
struct spar_vbus_headerinfo *hdr_info;
POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO);
hdr_info = kzalloc(sizeof(*hdr_info), GFP_KERNEL);
if (!hdr_info) {
rc = -1;
goto away;
}
dev_set_name(&dev->device, "visorbus%d", id);
dev->device.bus = &visorbus_type;
dev->device.groups = visorbus_groups;
dev->device.release = visorbus_release_busdevice;
if (device_register(&dev->device) < 0) {
POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id,
POSTCODE_SEVERITY_ERR);
rc = -1;
goto away_mem;
}
if (get_vbus_header_info(dev->visorchannel, hdr_info) >= 0) {
dev->vbus_hdr_info = (void *)hdr_info;
write_vbus_chp_info(dev->visorchannel, hdr_info,
&chipset_driverinfo);
write_vbus_bus_info(dev->visorchannel, hdr_info,
&clientbus_driverinfo);
} else {
kfree(hdr_info);
}
bus_count++;
list_add_tail(&dev->list_all, &list_all_bus_instances);
dev_set_drvdata(&dev->device, dev);
return 0;
away_mem:
kfree(hdr_info);
away:
return rc;
}
/** Remove a device instance for the visor bus itself.
*/
static void
remove_bus_instance(struct visor_device *dev)
{
/* Note that this will result in the release method for
* dev->dev being called, which will call
* visorbus_release_busdevice(). This has something to do with
* the put_device() done in device_unregister(), but I have never
* successfully been able to trace thru the code to see where/how
* release() gets called. But I know it does.
*/
bus_count--;
if (dev->visorchannel) {
visorchannel_destroy(dev->visorchannel);
dev->visorchannel = NULL;
}
kfree(dev->vbus_hdr_info);
list_del(&dev->list_all);
device_unregister(&dev->device);
}
/** Create and register the one-and-only one instance of
* the visor bus type (visorbus_type).
*/
static int
create_bus_type(void)
{
busreg_rc = bus_register(&visorbus_type);
return busreg_rc;
}
/** Remove the one-and-only one instance of the visor bus type (visorbus_type).
*/
static void
remove_bus_type(void)
{
bus_unregister(&visorbus_type);
}
/** Remove all child visor bus device instances.
*/
static void
remove_all_visor_devices(void)
{
struct list_head *listentry, *listtmp;
list_for_each_safe(listentry, listtmp, &list_all_device_instances) {
struct visor_device *dev = list_entry(listentry,
struct visor_device,
list_all);
remove_visor_device(dev);
}
}
static void
chipset_bus_create(struct visor_device *dev)
{
int rc;
u32 bus_no = dev->chipset_bus_no;
POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO);
rc = create_bus_instance(dev);
POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO);
if (rc < 0)
POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no,
POSTCODE_SEVERITY_ERR);
else
POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no,
POSTCODE_SEVERITY_INFO);
if (chipset_responders.bus_create)
(*chipset_responders.bus_create) (dev, rc);
}
static void
chipset_bus_destroy(struct visor_device *dev)
{
remove_bus_instance(dev);
if (chipset_responders.bus_destroy)
(*chipset_responders.bus_destroy)(dev, 0);
}
static void
chipset_device_create(struct visor_device *dev_info)
{
int rc = -1;
u32 bus_no = dev_info->chipset_bus_no;
u32 dev_no = dev_info->chipset_dev_no;
POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no,
POSTCODE_SEVERITY_INFO);
rc = create_visor_device(dev_info);
if (chipset_responders.device_create)
chipset_responders.device_create(dev_info, rc);
if (rc < 0)
POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
POSTCODE_SEVERITY_ERR);
else
POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no,
POSTCODE_SEVERITY_INFO);
}
static void
chipset_device_destroy(struct visor_device *dev_info)
{
remove_visor_device(dev_info);
if (chipset_responders.device_destroy)
(*chipset_responders.device_destroy) (dev_info, 0);
}
/* This is the callback function specified for a function driver, to
* be called when a pending "pause device" operation has been
* completed.
*/
static void
pause_state_change_complete(struct visor_device *dev, int status)
{
if (!dev->pausing)
return;
dev->pausing = false;
if (!chipset_responders.device_pause) /* this can never happen! */
return;
/* Notify the chipset driver that the pause is complete, which
* will presumably want to send some sort of response to the
* initiator. */
(*chipset_responders.device_pause) (dev, status);
}
/* This is the callback function specified for a function driver, to
* be called when a pending "resume device" operation has been
* completed.
*/
static void
resume_state_change_complete(struct visor_device *dev, int status)
{
if (!dev->resuming)
return;
dev->resuming = false;
if (!chipset_responders.device_resume) /* this can never happen! */
return;
/* Notify the chipset driver that the resume is complete,
* which will presumably want to send some sort of response to
* the initiator. */
(*chipset_responders.device_resume) (dev, status);
}
/* Tell the subordinate function driver for a specific device to pause
* or resume that device. Result is returned asynchronously via a
* callback function.
*/
static void
initiate_chipset_device_pause_resume(struct visor_device *dev, bool is_pause)
{
int rc = -1, x;
struct visor_driver *drv = NULL;
void (*notify_func)(struct visor_device *dev, int response) = NULL;
if (is_pause)
notify_func = chipset_responders.device_pause;
else
notify_func = chipset_responders.device_resume;
if (!notify_func)
goto away;
drv = to_visor_driver(dev->device.driver);
if (!drv)
goto away;
if (dev->pausing || dev->resuming)
goto away;
/* Note that even though both drv->pause() and drv->resume
* specify a callback function, it is NOT necessary for us to
* increment our local module usage count. Reason is, there
* is already a linkage dependency between child function
* drivers and visorbus, so it is already IMPOSSIBLE to unload
* visorbus while child function drivers are still running.
*/
if (is_pause) {
if (!drv->pause)
goto away;
dev->pausing = true;
x = drv->pause(dev, pause_state_change_complete);
} else {
/* This should be done at BUS resume time, but an
* existing problem prevents us from ever getting a bus
* resume... This hack would fail to work should we
* ever have a bus that contains NO devices, since we
* would never even get here in that case. */
fix_vbus_dev_info(dev);
if (!drv->resume)
goto away;
dev->resuming = true;
x = drv->resume(dev, resume_state_change_complete);
}
if (x < 0) {
if (is_pause)
dev->pausing = false;
else
dev->resuming = false;
goto away;
}
rc = 0;
away:
if (rc < 0) {
if (notify_func)
(*notify_func)(dev, rc);
}
}
static void
chipset_device_pause(struct visor_device *dev_info)
{
initiate_chipset_device_pause_resume(dev_info, true);
}
static void
chipset_device_resume(struct visor_device *dev_info)
{
initiate_chipset_device_pause_resume(dev_info, false);
}
struct channel_size_info {
uuid_le guid;
unsigned long min_size;
unsigned long max_size;
};
int
visorbus_init(void)
{
int rc = 0;
POSTCODE_LINUX_3(DRIVER_ENTRY_PC, rc, POSTCODE_SEVERITY_INFO);
bus_device_info_init(&clientbus_driverinfo,
"clientbus", "visorbus",
VERSION, NULL);
rc = create_bus_type();
if (rc < 0) {
POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, DIAG_SEVERITY_ERR);
goto away;
}
periodic_dev_workqueue = create_singlethread_workqueue("visorbus_dev");
if (!periodic_dev_workqueue) {
POSTCODE_LINUX_2(CREATE_WORKQUEUE_PC, DIAG_SEVERITY_ERR);
rc = -ENOMEM;
goto away;
}
/* This enables us to receive notifications when devices appear for
* which this service partition is to be a server for.
*/
visorchipset_register_busdev(&chipset_notifiers,
&chipset_responders,
&chipset_driverinfo);
rc = 0;
away:
if (rc)
POSTCODE_LINUX_3(CHIPSET_INIT_FAILURE_PC, rc,
POSTCODE_SEVERITY_ERR);
return rc;
}
void
visorbus_exit(void)
{
struct list_head *listentry, *listtmp;
visorchipset_register_busdev(NULL, NULL, NULL);
remove_all_visor_devices();
flush_workqueue(periodic_dev_workqueue); /* better not be any work! */
destroy_workqueue(periodic_dev_workqueue);
periodic_dev_workqueue = NULL;
if (periodic_test_workqueue) {
cancel_delayed_work(&periodic_work);
flush_workqueue(periodic_test_workqueue);
destroy_workqueue(periodic_test_workqueue);
periodic_test_workqueue = NULL;
}
list_for_each_safe(listentry, listtmp, &list_all_bus_instances) {
struct visor_device *dev = list_entry(listentry,
struct visor_device,
list_all);
remove_bus_instance(dev);
}
remove_bus_type();
}
module_param_named(debug, visorbus_debug, int, S_IRUGO);
MODULE_PARM_DESC(visorbus_debug, "1 to debug");
module_param_named(forcematch, visorbus_forcematch, int, S_IRUGO);
MODULE_PARM_DESC(visorbus_forcematch,
"1 to force a successful dev <--> drv match");
module_param_named(forcenomatch, visorbus_forcenomatch, int, S_IRUGO);
MODULE_PARM_DESC(visorbus_forcenomatch,
"1 to force an UNsuccessful dev <--> drv match");
module_param_named(debugref, visorbus_debugref, int, S_IRUGO);
MODULE_PARM_DESC(visorbus_debugref, "1 to debug reference counting");
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