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![David Kershner](/assets/img/avatar_default.png)
Move the visorbus driver out of staging (drivers/staging/unisys/visorbus) and to drivers/visorbus. Modify the configuration and makefiles so they now reference the new location. The s-Par header file visorbus.h that is referenced by all s-Par drivers, is being moved into include/linux. Signed-off-by: David Kershner <david.kershner@unisys.com> Reviewed-by: Tim Sell <timothy.sell@unisys.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1234 lines
38 KiB
C
1234 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright <20> 2010 - 2015 UNISYS CORPORATION
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* All rights reserved.
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*/
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#include <linux/ctype.h>
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/visorbus.h>
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#include <linux/uuid.h>
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#include "visorbus_private.h"
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static const guid_t visor_vbus_channel_guid = VISOR_VBUS_CHANNEL_GUID;
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/* Display string that is guaranteed to be no longer the 99 characters */
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#define LINESIZE 99
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#define POLLJIFFIES_NORMALCHANNEL 10
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/* stores whether bus_registration was successful */
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static bool initialized;
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static struct dentry *visorbus_debugfs_dir;
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/*
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* DEVICE type attributes
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*
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* The modalias file will contain the guid of the device.
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*/
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct visor_device *vdev;
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const guid_t *guid;
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vdev = to_visor_device(dev);
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guid = visorchannel_get_guid(vdev->visorchannel);
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return sprintf(buf, "visorbus:%pUl\n", guid);
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}
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static DEVICE_ATTR_RO(modalias);
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static struct attribute *visorbus_dev_attrs[] = {
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&dev_attr_modalias.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(visorbus_dev);
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/* filled in with info about parent chipset driver when we register with it */
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static struct visor_vbus_deviceinfo chipset_driverinfo;
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/* filled in with info about this driver, wrt it servicing client busses */
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static struct visor_vbus_deviceinfo clientbus_driverinfo;
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/* list of visor_device structs, linked via .list_all */
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static LIST_HEAD(list_all_bus_instances);
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/* list of visor_device structs, linked via .list_all */
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static LIST_HEAD(list_all_device_instances);
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/*
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* Generic function useful for validating any type of channel when it is
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* received by the client that will be accessing the channel.
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* Note that <logCtx> is only needed for callers in the EFI environment, and
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* is used to pass the EFI_DIAG_CAPTURE_PROTOCOL needed to log messages.
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*/
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int visor_check_channel(struct channel_header *ch, struct device *dev,
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const guid_t *expected_guid, char *chname,
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u64 expected_min_bytes, u32 expected_version,
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u64 expected_signature)
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{
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if (!guid_is_null(expected_guid)) {
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/* caller wants us to verify type GUID */
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if (!guid_equal(&ch->chtype, expected_guid)) {
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dev_err(dev, "Channel mismatch on channel=%s(%pUL) field=type expected=%pUL actual=%pUL\n",
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chname, expected_guid, expected_guid,
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&ch->chtype);
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return 0;
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}
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}
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/* verify channel size */
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if (expected_min_bytes > 0) {
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if (ch->size < expected_min_bytes) {
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dev_err(dev, "Channel mismatch on channel=%s(%pUL) field=size expected=0x%-8.8Lx actual=0x%-8.8Lx\n",
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chname, expected_guid,
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(unsigned long long)expected_min_bytes,
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ch->size);
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return 0;
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}
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}
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/* verify channel version */
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if (expected_version > 0) {
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if (ch->version_id != expected_version) {
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dev_err(dev, "Channel mismatch on channel=%s(%pUL) field=version expected=0x%-8.8lx actual=0x%-8.8x\n",
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chname, expected_guid,
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(unsigned long)expected_version,
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ch->version_id);
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return 0;
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}
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}
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/* verify channel signature */
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if (expected_signature > 0) {
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if (ch->signature != expected_signature) {
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dev_err(dev, "Channel mismatch on channel=%s(%pUL) field=signature expected=0x%-8.8Lx actual=0x%-8.8Lx\n",
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chname, expected_guid, expected_signature,
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ch->signature);
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return 0;
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}
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}
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return 1;
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}
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static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env)
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{
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struct visor_device *dev;
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const guid_t *guid;
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dev = to_visor_device(xdev);
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guid = visorchannel_get_guid(dev->visorchannel);
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return add_uevent_var(env, "MODALIAS=visorbus:%pUl", guid);
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}
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/*
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* visorbus_match() - called automatically upon adding a visor_device
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* (device_add), or adding a visor_driver
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* (visorbus_register_visor_driver)
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* @xdev: struct device for the device being matched
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* @xdrv: struct device_driver for driver to match device against
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*
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* Return: 1 iff the provided driver can control the specified device
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*/
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static int visorbus_match(struct device *xdev, struct device_driver *xdrv)
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{
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const guid_t *channel_type;
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int i;
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struct visor_device *dev;
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struct visor_driver *drv;
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struct visorchannel *chan;
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dev = to_visor_device(xdev);
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channel_type = visorchannel_get_guid(dev->visorchannel);
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drv = to_visor_driver(xdrv);
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chan = dev->visorchannel;
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if (!drv->channel_types)
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return 0;
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for (i = 0; !guid_is_null(&drv->channel_types[i].guid); i++)
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if (guid_equal(&drv->channel_types[i].guid, channel_type) &&
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visor_check_channel(visorchannel_get_header(chan),
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xdev,
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&drv->channel_types[i].guid,
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(char *)drv->channel_types[i].name,
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drv->channel_types[i].min_bytes,
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drv->channel_types[i].version,
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VISOR_CHANNEL_SIGNATURE))
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return i + 1;
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return 0;
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}
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/*
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* This describes the TYPE of bus.
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* (Don't confuse this with an INSTANCE of the bus.)
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*/
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static struct bus_type visorbus_type = {
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.name = "visorbus",
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.match = visorbus_match,
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.uevent = visorbus_uevent,
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.dev_groups = visorbus_dev_groups,
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};
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struct visor_busdev {
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u32 bus_no;
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u32 dev_no;
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};
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static int match_visorbus_dev_by_id(struct device *dev, void *data)
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{
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struct visor_device *vdev = to_visor_device(dev);
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struct visor_busdev *id = data;
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if (vdev->chipset_bus_no == id->bus_no &&
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vdev->chipset_dev_no == id->dev_no)
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return 1;
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return 0;
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}
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struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
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struct visor_device *from)
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{
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struct device *dev;
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struct device *dev_start = NULL;
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struct visor_busdev id = {
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.bus_no = bus_no,
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.dev_no = dev_no
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};
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if (from)
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dev_start = &from->device;
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dev = bus_find_device(&visorbus_type, dev_start, (void *)&id,
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match_visorbus_dev_by_id);
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if (!dev)
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return NULL;
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return to_visor_device(dev);
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}
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/*
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* visorbus_release_busdevice() - called when device_unregister() is called for
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* the bus device instance, after all other tasks
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* involved with destroying the dev are complete
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* @xdev: struct device for the bus being released
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*/
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static void visorbus_release_busdevice(struct device *xdev)
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{
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struct visor_device *dev = dev_get_drvdata(xdev);
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debugfs_remove(dev->debugfs_bus_info);
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debugfs_remove_recursive(dev->debugfs_dir);
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visorchannel_destroy(dev->visorchannel);
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kfree(dev);
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}
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/*
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* visorbus_release_device() - called when device_unregister() is called for
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* each child device instance
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* @xdev: struct device for the visor device being released
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*/
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static void visorbus_release_device(struct device *xdev)
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{
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struct visor_device *dev = to_visor_device(xdev);
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visorchannel_destroy(dev->visorchannel);
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kfree(dev);
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}
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/*
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* BUS specific channel attributes to appear under
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* /sys/bus/visorbus<x>/dev<y>/channel
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*/
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static ssize_t physaddr_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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return sprintf(buf, "0x%llx\n",
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visorchannel_get_physaddr(vdev->visorchannel));
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}
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static DEVICE_ATTR_RO(physaddr);
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static ssize_t nbytes_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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return sprintf(buf, "0x%lx\n",
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visorchannel_get_nbytes(vdev->visorchannel));
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}
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static DEVICE_ATTR_RO(nbytes);
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static ssize_t clientpartition_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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return sprintf(buf, "0x%llx\n",
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visorchannel_get_clientpartition(vdev->visorchannel));
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}
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static DEVICE_ATTR_RO(clientpartition);
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static ssize_t typeguid_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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char typeid[LINESIZE];
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return sprintf(buf, "%s\n",
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visorchannel_id(vdev->visorchannel, typeid));
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}
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static DEVICE_ATTR_RO(typeguid);
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static ssize_t zoneguid_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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char zoneid[LINESIZE];
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return sprintf(buf, "%s\n",
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visorchannel_zoneid(vdev->visorchannel, zoneid));
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}
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static DEVICE_ATTR_RO(zoneguid);
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static ssize_t typename_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int i = 0;
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struct bus_type *xbus = dev->bus;
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struct device_driver *xdrv = dev->driver;
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struct visor_driver *drv = NULL;
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if (!xdrv)
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return 0;
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i = xbus->match(dev, xdrv);
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if (!i)
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return 0;
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drv = to_visor_driver(xdrv);
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return sprintf(buf, "%s\n", drv->channel_types[i - 1].name);
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}
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static DEVICE_ATTR_RO(typename);
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static struct attribute *channel_attrs[] = {
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&dev_attr_physaddr.attr,
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&dev_attr_nbytes.attr,
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&dev_attr_clientpartition.attr,
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&dev_attr_typeguid.attr,
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&dev_attr_zoneguid.attr,
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&dev_attr_typename.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(channel);
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/*
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* BUS instance attributes
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*
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* define & implement display of bus attributes under
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* /sys/bus/visorbus/devices/visorbus<n>.
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*/
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static ssize_t partition_handle_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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u64 handle = visorchannel_get_clientpartition(vdev->visorchannel);
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return sprintf(buf, "0x%llx\n", handle);
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}
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static DEVICE_ATTR_RO(partition_handle);
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static ssize_t partition_guid_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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return sprintf(buf, "{%pUb}\n", &vdev->partition_guid);
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}
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static DEVICE_ATTR_RO(partition_guid);
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static ssize_t partition_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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return sprintf(buf, "%s\n", vdev->name);
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}
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static DEVICE_ATTR_RO(partition_name);
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static ssize_t channel_addr_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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u64 addr = visorchannel_get_physaddr(vdev->visorchannel);
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return sprintf(buf, "0x%llx\n", addr);
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}
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static DEVICE_ATTR_RO(channel_addr);
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static ssize_t channel_bytes_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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u64 nbytes = visorchannel_get_nbytes(vdev->visorchannel);
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return sprintf(buf, "0x%llx\n", nbytes);
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}
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static DEVICE_ATTR_RO(channel_bytes);
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static ssize_t channel_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct visor_device *vdev = to_visor_device(dev);
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int len = 0;
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visorchannel_id(vdev->visorchannel, buf);
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len = strlen(buf);
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buf[len++] = '\n';
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return len;
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}
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static DEVICE_ATTR_RO(channel_id);
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static struct attribute *visorbus_attrs[] = {
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&dev_attr_partition_handle.attr,
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&dev_attr_partition_guid.attr,
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&dev_attr_partition_name.attr,
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&dev_attr_channel_addr.attr,
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&dev_attr_channel_bytes.attr,
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&dev_attr_channel_id.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(visorbus);
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/*
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* BUS debugfs entries
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*
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* define & implement display of debugfs attributes under
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* /sys/kernel/debug/visorbus/visorbus<n>.
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*/
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/*
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* vbuschannel_print_devinfo() - format a struct visor_vbus_deviceinfo
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* and write it to a seq_file
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* @devinfo: the struct visor_vbus_deviceinfo to format
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* @seq: seq_file to write to
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* @devix: the device index to be included in the output data, or -1 if no
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* device index is to be included
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*
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* Reads @devInfo, and writes it in human-readable notation to @seq.
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*/
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static void vbuschannel_print_devinfo(struct visor_vbus_deviceinfo *devinfo,
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struct seq_file *seq, int devix)
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{
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/* uninitialized vbus device entry */
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if (!isprint(devinfo->devtype[0]))
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return;
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if (devix >= 0)
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seq_printf(seq, "[%d]", devix);
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else
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/* vbus device entry is for bus or chipset */
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seq_puts(seq, " ");
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/*
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* Note: because the s-Par back-end is free to scribble in this area,
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* we never assume '\0'-termination.
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*/
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seq_printf(seq, "%-*.*s ", (int)sizeof(devinfo->devtype),
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(int)sizeof(devinfo->devtype), devinfo->devtype);
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seq_printf(seq, "%-*.*s ", (int)sizeof(devinfo->drvname),
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(int)sizeof(devinfo->drvname), devinfo->drvname);
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seq_printf(seq, "%.*s\n", (int)sizeof(devinfo->infostrs),
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devinfo->infostrs);
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}
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static int bus_info_debugfs_show(struct seq_file *seq, void *v)
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{
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int i = 0;
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unsigned long off;
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struct visor_vbus_deviceinfo dev_info;
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struct visor_device *vdev = seq->private;
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struct visorchannel *channel = vdev->visorchannel;
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if (!channel)
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return 0;
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seq_printf(seq,
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"Client device/driver info for %s partition (vbus #%u):\n",
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((vdev->name) ? (char *)(vdev->name) : ""),
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vdev->chipset_bus_no);
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if (visorchannel_read(channel,
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offsetof(struct visor_vbus_channel, chp_info),
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&dev_info, sizeof(dev_info)) >= 0)
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vbuschannel_print_devinfo(&dev_info, seq, -1);
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if (visorchannel_read(channel,
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offsetof(struct visor_vbus_channel, bus_info),
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&dev_info, sizeof(dev_info)) >= 0)
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vbuschannel_print_devinfo(&dev_info, seq, -1);
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off = offsetof(struct visor_vbus_channel, dev_info);
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while (off + sizeof(dev_info) <= visorchannel_get_nbytes(channel)) {
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if (visorchannel_read(channel, off, &dev_info,
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sizeof(dev_info)) >= 0)
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vbuschannel_print_devinfo(&dev_info, seq, i);
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off += sizeof(dev_info);
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i++;
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}
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return 0;
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}
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static int bus_info_debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, bus_info_debugfs_show, inode->i_private);
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}
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static const struct file_operations bus_info_debugfs_fops = {
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.owner = THIS_MODULE,
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.open = bus_info_debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void dev_periodic_work(struct timer_list *t)
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{
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struct visor_device *dev = from_timer(dev, t, timer);
|
||
struct visor_driver *drv = to_visor_driver(dev->device.driver);
|
||
|
||
drv->channel_interrupt(dev);
|
||
mod_timer(&dev->timer, jiffies + POLLJIFFIES_NORMALCHANNEL);
|
||
}
|
||
|
||
static int dev_start_periodic_work(struct visor_device *dev)
|
||
{
|
||
if (dev->being_removed || dev->timer_active)
|
||
return -EINVAL;
|
||
|
||
/* now up by at least 2 */
|
||
get_device(&dev->device);
|
||
dev->timer.expires = jiffies + POLLJIFFIES_NORMALCHANNEL;
|
||
add_timer(&dev->timer);
|
||
dev->timer_active = true;
|
||
return 0;
|
||
}
|
||
|
||
static void dev_stop_periodic_work(struct visor_device *dev)
|
||
{
|
||
if (!dev->timer_active)
|
||
return;
|
||
|
||
del_timer_sync(&dev->timer);
|
||
dev->timer_active = false;
|
||
put_device(&dev->device);
|
||
}
|
||
|
||
/*
|
||
* visordriver_remove_device() - handle visor device going away
|
||
* @xdev: struct device for the visor device being removed
|
||
*
|
||
* This is called when device_unregister() is called for each child device
|
||
* instance, to notify the appropriate visorbus function driver that the device
|
||
* is going away, and to decrease the reference count of the device.
|
||
*
|
||
* Return: 0 iff successful
|
||
*/
|
||
static int visordriver_remove_device(struct device *xdev)
|
||
{
|
||
struct visor_device *dev = to_visor_device(xdev);
|
||
struct visor_driver *drv = to_visor_driver(xdev->driver);
|
||
|
||
mutex_lock(&dev->visordriver_callback_lock);
|
||
dev->being_removed = true;
|
||
drv->remove(dev);
|
||
mutex_unlock(&dev->visordriver_callback_lock);
|
||
dev_stop_periodic_work(dev);
|
||
put_device(&dev->device);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* visorbus_unregister_visor_driver() - unregisters the provided driver
|
||
* @drv: the driver to unregister
|
||
*
|
||
* A visor function driver calls this function to unregister the driver,
|
||
* i.e., within its module_exit function.
|
||
*/
|
||
void visorbus_unregister_visor_driver(struct visor_driver *drv)
|
||
{
|
||
driver_unregister(&drv->driver);
|
||
}
|
||
EXPORT_SYMBOL_GPL(visorbus_unregister_visor_driver);
|
||
|
||
/*
|
||
* visorbus_read_channel() - reads from the designated channel into
|
||
* the provided buffer
|
||
* @dev: the device whose channel is read from
|
||
* @offset: the offset into the channel at which reading starts
|
||
* @dest: the destination buffer that is written into from the channel
|
||
* @nbytes: the number of bytes to read from the channel
|
||
*
|
||
* If receiving a message, use the visorchannel_signalremove() function instead.
|
||
*
|
||
* Return: integer indicating success (zero) or failure (non-zero)
|
||
*/
|
||
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);
|
||
|
||
/*
|
||
* visorbus_write_channel() - writes the provided buffer into the designated
|
||
* channel
|
||
* @dev: the device whose channel is written to
|
||
* @offset: the offset into the channel at which writing starts
|
||
* @src: the source buffer that is written into the channel
|
||
* @nbytes: the number of bytes to write into the channel
|
||
*
|
||
* If sending a message, use the visorchannel_signalinsert() function instead.
|
||
*
|
||
* Return: integer indicating success (zero) or failure (non-zero)
|
||
*/
|
||
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);
|
||
|
||
/*
|
||
* visorbus_enable_channel_interrupts() - enables interrupts on the
|
||
* designated device
|
||
* @dev: the device on which to enable interrupts
|
||
*
|
||
* Currently we don't yet have a real interrupt, so for now we just call the
|
||
* interrupt function periodically via a timer.
|
||
*/
|
||
int visorbus_enable_channel_interrupts(struct visor_device *dev)
|
||
{
|
||
struct visor_driver *drv = to_visor_driver(dev->device.driver);
|
||
|
||
if (!drv->channel_interrupt) {
|
||
dev_err(&dev->device, "%s no interrupt function!\n", __func__);
|
||
return -ENOENT;
|
||
}
|
||
|
||
return dev_start_periodic_work(dev);
|
||
}
|
||
EXPORT_SYMBOL_GPL(visorbus_enable_channel_interrupts);
|
||
|
||
/*
|
||
* visorbus_disable_channel_interrupts() - disables interrupts on the
|
||
* designated device
|
||
* @dev: the device on which to disable interrupts
|
||
*/
|
||
void visorbus_disable_channel_interrupts(struct visor_device *dev)
|
||
{
|
||
dev_stop_periodic_work(dev);
|
||
}
|
||
EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts);
|
||
|
||
/*
|
||
* create_visor_device() - create visor device as a result of receiving the
|
||
* controlvm device_create message for a new device
|
||
* @dev: a freshly-zeroed struct visor_device, containing only filled-in values
|
||
* for chipset_bus_no and chipset_dev_no, that will be initialized
|
||
*
|
||
* 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.
|
||
*
|
||
* Return: 0 if successful, otherwise the negative value returned by
|
||
* device_add() indicating the reason for failure
|
||
*/
|
||
int create_visor_device(struct visor_device *dev)
|
||
{
|
||
int err;
|
||
u32 chipset_bus_no = dev->chipset_bus_no;
|
||
u32 chipset_dev_no = dev->chipset_dev_no;
|
||
|
||
mutex_init(&dev->visordriver_callback_lock);
|
||
dev->device.bus = &visorbus_type;
|
||
dev->device.groups = channel_groups;
|
||
device_initialize(&dev->device);
|
||
dev->device.release = visorbus_release_device;
|
||
/* keep a reference just for us (now 2) */
|
||
get_device(&dev->device);
|
||
timer_setup(&dev->timer, dev_periodic_work, 0);
|
||
/*
|
||
* 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.
|
||
*/
|
||
err = dev_set_name(&dev->device, "vbus%u:dev%u",
|
||
chipset_bus_no, chipset_dev_no);
|
||
if (err)
|
||
goto err_put;
|
||
/*
|
||
* 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).
|
||
*/
|
||
err = device_add(&dev->device);
|
||
if (err < 0)
|
||
goto err_put;
|
||
list_add_tail(&dev->list_all, &list_all_device_instances);
|
||
dev->state.created = 1;
|
||
visorbus_response(dev, err, CONTROLVM_DEVICE_CREATE);
|
||
/* success: reference kept via unmatched get_device() */
|
||
return 0;
|
||
|
||
err_put:
|
||
put_device(&dev->device);
|
||
dev_err(&dev->device, "Creating visor device failed. %d\n", err);
|
||
return err;
|
||
}
|
||
|
||
void remove_visor_device(struct visor_device *dev)
|
||
{
|
||
list_del(&dev->list_all);
|
||
put_device(&dev->device);
|
||
if (dev->pending_msg_hdr)
|
||
visorbus_response(dev, 0, CONTROLVM_DEVICE_DESTROY);
|
||
device_unregister(&dev->device);
|
||
}
|
||
|
||
static int get_vbus_header_info(struct visorchannel *chan,
|
||
struct device *dev,
|
||
struct visor_vbus_headerinfo *hdr_info)
|
||
{
|
||
int err;
|
||
|
||
if (!visor_check_channel(visorchannel_get_header(chan),
|
||
dev,
|
||
&visor_vbus_channel_guid,
|
||
"vbus",
|
||
sizeof(struct visor_vbus_channel),
|
||
VISOR_VBUS_CHANNEL_VERSIONID,
|
||
VISOR_CHANNEL_SIGNATURE))
|
||
return -EINVAL;
|
||
|
||
err = visorchannel_read(chan, sizeof(struct channel_header), hdr_info,
|
||
sizeof(*hdr_info));
|
||
if (err < 0)
|
||
return err;
|
||
if (hdr_info->struct_bytes < sizeof(struct visor_vbus_headerinfo))
|
||
return -EINVAL;
|
||
if (hdr_info->device_info_struct_bytes <
|
||
sizeof(struct visor_vbus_deviceinfo))
|
||
return -EINVAL;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* write_vbus_chp_info() - write the contents of <info> to the struct
|
||
* visor_vbus_channel.chp_info
|
||
* @chan: indentifies the s-Par channel that will be updated
|
||
* @hdr_info: used to find appropriate channel offset to write data
|
||
* @info: contains the information to write
|
||
*
|
||
* Writes chipset info into the channel memory to be used for diagnostic
|
||
* purposes.
|
||
*
|
||
* Returns no value since this is debug information and not needed for
|
||
* device functionality.
|
||
*/
|
||
static void write_vbus_chp_info(struct visorchannel *chan,
|
||
struct visor_vbus_headerinfo *hdr_info,
|
||
struct visor_vbus_deviceinfo *info)
|
||
{
|
||
int off;
|
||
|
||
if (hdr_info->chp_info_offset == 0)
|
||
return;
|
||
|
||
off = sizeof(struct channel_header) + hdr_info->chp_info_offset;
|
||
visorchannel_write(chan, off, info, sizeof(*info));
|
||
}
|
||
|
||
/*
|
||
* write_vbus_bus_info() - write the contents of <info> to the struct
|
||
* visor_vbus_channel.bus_info
|
||
* @chan: indentifies the s-Par channel that will be updated
|
||
* @hdr_info: used to find appropriate channel offset to write data
|
||
* @info: contains the information to write
|
||
*
|
||
* Writes bus info into the channel memory to be used for diagnostic
|
||
* purposes.
|
||
*
|
||
* Returns no value since this is debug information and not needed for
|
||
* device functionality.
|
||
*/
|
||
static void write_vbus_bus_info(struct visorchannel *chan,
|
||
struct visor_vbus_headerinfo *hdr_info,
|
||
struct visor_vbus_deviceinfo *info)
|
||
{
|
||
int off;
|
||
|
||
if (hdr_info->bus_info_offset == 0)
|
||
return;
|
||
|
||
off = sizeof(struct channel_header) + hdr_info->bus_info_offset;
|
||
visorchannel_write(chan, off, info, sizeof(*info));
|
||
}
|
||
|
||
/*
|
||
* write_vbus_dev_info() - write the contents of <info> to the struct
|
||
* visor_vbus_channel.dev_info[<devix>]
|
||
* @chan: indentifies the s-Par channel that will be updated
|
||
* @hdr_info: used to find appropriate channel offset to write data
|
||
* @info: contains the information to write
|
||
* @devix: the relative device number (0..n-1) of the device on the bus
|
||
*
|
||
* Writes device info into the channel memory to be used for diagnostic
|
||
* purposes.
|
||
*
|
||
* Returns no value since this is debug information and not needed for
|
||
* device functionality.
|
||
*/
|
||
static void write_vbus_dev_info(struct visorchannel *chan,
|
||
struct visor_vbus_headerinfo *hdr_info,
|
||
struct visor_vbus_deviceinfo *info,
|
||
unsigned int devix)
|
||
{
|
||
int off;
|
||
|
||
if (hdr_info->dev_info_offset == 0)
|
||
return;
|
||
off = (sizeof(struct channel_header) + hdr_info->dev_info_offset) +
|
||
(hdr_info->device_info_struct_bytes * devix);
|
||
visorchannel_write(chan, off, info, sizeof(*info));
|
||
}
|
||
|
||
static void bus_device_info_init(
|
||
struct visor_vbus_deviceinfo *bus_device_info_ptr,
|
||
const char *dev_type, const char *drv_name)
|
||
{
|
||
memset(bus_device_info_ptr, 0, sizeof(struct visor_vbus_deviceinfo));
|
||
snprintf(bus_device_info_ptr->devtype,
|
||
sizeof(bus_device_info_ptr->devtype),
|
||
"%s", (dev_type) ? dev_type : "unknownType");
|
||
snprintf(bus_device_info_ptr->drvname,
|
||
sizeof(bus_device_info_ptr->drvname),
|
||
"%s", (drv_name) ? drv_name : "unknownDriver");
|
||
snprintf(bus_device_info_ptr->infostrs,
|
||
sizeof(bus_device_info_ptr->infostrs), "kernel ver. %s",
|
||
utsname()->release);
|
||
}
|
||
|
||
/*
|
||
* publish_vbus_dev_info() - for a child device just created on a client bus,
|
||
* fill in information about the driver that is
|
||
* controlling this device into the appropriate slot
|
||
* within the vbus channel of the bus instance
|
||
* @visordev: struct visor_device for the desired device
|
||
*/
|
||
static void publish_vbus_dev_info(struct visor_device *visordev)
|
||
{
|
||
int i;
|
||
struct visor_device *bdev;
|
||
struct visor_driver *visordrv;
|
||
u32 bus_no = visordev->chipset_bus_no;
|
||
u32 dev_no = visordev->chipset_dev_no;
|
||
struct visor_vbus_deviceinfo dev_info;
|
||
const char *chan_type_name = NULL;
|
||
struct visor_vbus_headerinfo *hdr_info;
|
||
|
||
if (!visordev->device.driver)
|
||
return;
|
||
bdev = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
|
||
if (!bdev)
|
||
return;
|
||
hdr_info = (struct visor_vbus_headerinfo *)bdev->vbus_hdr_info;
|
||
if (!hdr_info)
|
||
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 (guid_equal(&visordrv->channel_types[i].guid,
|
||
&visordev->channel_type_guid)) {
|
||
chan_type_name = visordrv->channel_types[i].name;
|
||
break;
|
||
}
|
||
}
|
||
bus_device_info_init(&dev_info, chan_type_name, visordrv->name);
|
||
write_vbus_dev_info(bdev->visorchannel, hdr_info, &dev_info, dev_no);
|
||
write_vbus_chp_info(bdev->visorchannel, hdr_info, &chipset_driverinfo);
|
||
write_vbus_bus_info(bdev->visorchannel, hdr_info,
|
||
&clientbus_driverinfo);
|
||
}
|
||
|
||
/*
|
||
* visordriver_probe_device() - handle new visor device coming online
|
||
* @xdev: struct device for the visor device being probed
|
||
*
|
||
* 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.
|
||
*
|
||
* If successful, a reference to the device will be held onto via get_device().
|
||
*
|
||
* Return: 0 if successful, meaning the function driver's probe() function
|
||
* was successful with this device, otherwise a negative errno
|
||
* value indicating failure reason
|
||
*/
|
||
static int visordriver_probe_device(struct device *xdev)
|
||
{
|
||
int err;
|
||
struct visor_driver *drv = to_visor_driver(xdev->driver);
|
||
struct visor_device *dev = to_visor_device(xdev);
|
||
|
||
mutex_lock(&dev->visordriver_callback_lock);
|
||
dev->being_removed = false;
|
||
err = drv->probe(dev);
|
||
if (err) {
|
||
mutex_unlock(&dev->visordriver_callback_lock);
|
||
return err;
|
||
}
|
||
/* success: reference kept via unmatched get_device() */
|
||
get_device(&dev->device);
|
||
publish_vbus_dev_info(dev);
|
||
mutex_unlock(&dev->visordriver_callback_lock);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* visorbus_register_visor_driver() - registers the provided visor driver for
|
||
* handling one or more visor device
|
||
* types (channel_types)
|
||
* @drv: the driver to register
|
||
*
|
||
* A visor function 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().
|
||
*
|
||
* Return: integer indicating success (zero) or failure (non-zero)
|
||
*/
|
||
int visorbus_register_visor_driver(struct visor_driver *drv)
|
||
{
|
||
/* can't register on a nonexistent bus */
|
||
if (!initialized)
|
||
return -ENODEV;
|
||
if (!drv->probe)
|
||
return -EINVAL;
|
||
if (!drv->remove)
|
||
return -EINVAL;
|
||
if (!drv->pause)
|
||
return -EINVAL;
|
||
if (!drv->resume)
|
||
return -EINVAL;
|
||
|
||
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
|
||
*/
|
||
return driver_register(&drv->driver);
|
||
}
|
||
EXPORT_SYMBOL_GPL(visorbus_register_visor_driver);
|
||
|
||
/*
|
||
* visorbus_create_instance() - create a device instance for the visorbus itself
|
||
* @dev: struct visor_device indicating the bus instance
|
||
*
|
||
* Return: 0 for success, otherwise negative errno value indicating reason for
|
||
* failure
|
||
*/
|
||
int visorbus_create_instance(struct visor_device *dev)
|
||
{
|
||
int id = dev->chipset_bus_no;
|
||
int err;
|
||
struct visor_vbus_headerinfo *hdr_info;
|
||
|
||
hdr_info = kzalloc(sizeof(*hdr_info), GFP_KERNEL);
|
||
if (!hdr_info)
|
||
return -ENOMEM;
|
||
dev_set_name(&dev->device, "visorbus%d", id);
|
||
dev->device.bus = &visorbus_type;
|
||
dev->device.groups = visorbus_groups;
|
||
dev->device.release = visorbus_release_busdevice;
|
||
dev->debugfs_dir = debugfs_create_dir(dev_name(&dev->device),
|
||
visorbus_debugfs_dir);
|
||
dev->debugfs_bus_info = debugfs_create_file("client_bus_info", 0440,
|
||
dev->debugfs_dir, dev,
|
||
&bus_info_debugfs_fops);
|
||
dev_set_drvdata(&dev->device, dev);
|
||
err = get_vbus_header_info(dev->visorchannel, &dev->device, hdr_info);
|
||
if (err < 0)
|
||
goto err_debugfs_dir;
|
||
err = device_register(&dev->device);
|
||
if (err < 0)
|
||
goto err_debugfs_dir;
|
||
list_add_tail(&dev->list_all, &list_all_bus_instances);
|
||
dev->state.created = 1;
|
||
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);
|
||
visorbus_response(dev, err, CONTROLVM_BUS_CREATE);
|
||
return 0;
|
||
|
||
err_debugfs_dir:
|
||
debugfs_remove_recursive(dev->debugfs_dir);
|
||
kfree(hdr_info);
|
||
dev_err(&dev->device, "%s failed: %d\n", __func__, err);
|
||
return err;
|
||
}
|
||
|
||
/*
|
||
* visorbus_remove_instance() - remove a device instance for the visorbus itself
|
||
* @dev: struct visor_device indentifying the bus to remove
|
||
*/
|
||
void visorbus_remove_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.
|
||
*/
|
||
kfree(dev->vbus_hdr_info);
|
||
list_del(&dev->list_all);
|
||
if (dev->pending_msg_hdr)
|
||
visorbus_response(dev, 0, CONTROLVM_BUS_DESTROY);
|
||
device_unregister(&dev->device);
|
||
}
|
||
|
||
/*
|
||
* remove_all_visor_devices() - remove all child visorbus 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;
|
||
|
||
dev = list_entry(listentry, struct visor_device, list_all);
|
||
remove_visor_device(dev);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* pause_state_change_complete() - the callback function to be called by a
|
||
* visorbus function driver when a
|
||
* pending "pause device" operation has
|
||
* completed
|
||
* @dev: struct visor_device identifying the paused device
|
||
* @status: 0 iff the pause state change completed successfully, otherwise
|
||
* a negative errno value indicating the reason for failure
|
||
*/
|
||
static void pause_state_change_complete(struct visor_device *dev, int status)
|
||
{
|
||
if (!dev->pausing)
|
||
return;
|
||
|
||
dev->pausing = false;
|
||
visorbus_device_changestate_response(dev, status,
|
||
segment_state_standby);
|
||
}
|
||
|
||
/*
|
||
* resume_state_change_complete() - the callback function to be called by a
|
||
* visorbus function driver when a
|
||
* pending "resume device" operation has
|
||
* completed
|
||
* @dev: struct visor_device identifying the resumed device
|
||
* @status: 0 iff the resume state change completed successfully, otherwise
|
||
* a negative errno value indicating the reason for failure
|
||
*/
|
||
static void resume_state_change_complete(struct visor_device *dev, int status)
|
||
{
|
||
if (!dev->resuming)
|
||
return;
|
||
|
||
dev->resuming = false;
|
||
/*
|
||
* Notify the chipset driver that the resume is complete,
|
||
* which will presumably want to send some sort of response to
|
||
* the initiator.
|
||
*/
|
||
visorbus_device_changestate_response(dev, status,
|
||
segment_state_running);
|
||
}
|
||
|
||
/*
|
||
* visorchipset_initiate_device_pause_resume() - start a pause or resume
|
||
* operation for a visor device
|
||
* @dev: struct visor_device identifying the device being paused or resumed
|
||
* @is_pause: true to indicate pause operation, false to indicate resume
|
||
*
|
||
* Tell the subordinate function driver for a specific device to pause
|
||
* or resume that device. Success/failure result is returned asynchronously
|
||
* via a callback function; see pause_state_change_complete() and
|
||
* resume_state_change_complete().
|
||
*/
|
||
static int visorchipset_initiate_device_pause_resume(struct visor_device *dev,
|
||
bool is_pause)
|
||
{
|
||
int err;
|
||
struct visor_driver *drv;
|
||
|
||
/* If no driver associated with the device nothing to pause/resume */
|
||
if (!dev->device.driver)
|
||
return 0;
|
||
if (dev->pausing || dev->resuming)
|
||
return -EBUSY;
|
||
|
||
drv = to_visor_driver(dev->device.driver);
|
||
if (is_pause) {
|
||
dev->pausing = true;
|
||
err = drv->pause(dev, pause_state_change_complete);
|
||
} else {
|
||
/*
|
||
* The vbus_dev_info structure in the channel was been cleared,
|
||
* make sure it is valid.
|
||
*/
|
||
publish_vbus_dev_info(dev);
|
||
dev->resuming = true;
|
||
err = drv->resume(dev, resume_state_change_complete);
|
||
}
|
||
return err;
|
||
}
|
||
|
||
/*
|
||
* visorchipset_device_pause() - start a pause operation for a visor device
|
||
* @dev_info: struct visor_device identifying the device being paused
|
||
*
|
||
* Tell the subordinate function driver for a specific device to pause
|
||
* that device. Success/failure result is returned asynchronously
|
||
* via a callback function; see pause_state_change_complete().
|
||
*/
|
||
int visorchipset_device_pause(struct visor_device *dev_info)
|
||
{
|
||
int err;
|
||
|
||
err = visorchipset_initiate_device_pause_resume(dev_info, true);
|
||
if (err < 0) {
|
||
dev_info->pausing = false;
|
||
return err;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* visorchipset_device_resume() - start a resume operation for a visor device
|
||
* @dev_info: struct visor_device identifying the device being resumed
|
||
*
|
||
* Tell the subordinate function driver for a specific device to resume
|
||
* that device. Success/failure result is returned asynchronously
|
||
* via a callback function; see resume_state_change_complete().
|
||
*/
|
||
int visorchipset_device_resume(struct visor_device *dev_info)
|
||
{
|
||
int err;
|
||
|
||
err = visorchipset_initiate_device_pause_resume(dev_info, false);
|
||
if (err < 0) {
|
||
dev_info->resuming = false;
|
||
return err;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
int visorbus_init(void)
|
||
{
|
||
int err;
|
||
|
||
visorbus_debugfs_dir = debugfs_create_dir("visorbus", NULL);
|
||
bus_device_info_init(&clientbus_driverinfo, "clientbus", "visorbus");
|
||
err = bus_register(&visorbus_type);
|
||
if (err < 0)
|
||
return err;
|
||
initialized = true;
|
||
bus_device_info_init(&chipset_driverinfo, "chipset", "visorchipset");
|
||
return 0;
|
||
}
|
||
|
||
void visorbus_exit(void)
|
||
{
|
||
struct list_head *listentry, *listtmp;
|
||
|
||
remove_all_visor_devices();
|
||
list_for_each_safe(listentry, listtmp, &list_all_bus_instances) {
|
||
struct visor_device *dev;
|
||
|
||
dev = list_entry(listentry, struct visor_device, list_all);
|
||
visorbus_remove_instance(dev);
|
||
}
|
||
bus_unregister(&visorbus_type);
|
||
initialized = false;
|
||
debugfs_remove_recursive(visorbus_debugfs_dir);
|
||
}
|