mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
283c0972d5
Convert printks to pr_<level> (excludes printk(KERN_DEBUG...) to be more consistent throughout the xen subsystem. Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME Coalesce formats and add missing word spaces Add missing newlines Align arguments and reflow to 80 columns Remove DRV_NAME from formats as pr_fmt adds the same content This does change some of the prefixes of these messages but it also does make them more consistent. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
744 lines
18 KiB
C
744 lines
18 KiB
C
/*
|
|
* PCI Backend Xenbus Setup - handles setup with frontend and xend
|
|
*
|
|
* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/workqueue.h>
|
|
#include <xen/xenbus.h>
|
|
#include <xen/events.h>
|
|
#include <asm/xen/pci.h>
|
|
#include "pciback.h"
|
|
|
|
#define INVALID_EVTCHN_IRQ (-1)
|
|
struct workqueue_struct *xen_pcibk_wq;
|
|
|
|
static bool __read_mostly passthrough;
|
|
module_param(passthrough, bool, S_IRUGO);
|
|
MODULE_PARM_DESC(passthrough,
|
|
"Option to specify how to export PCI topology to guest:\n"\
|
|
" 0 - (default) Hide the true PCI topology and makes the frontend\n"\
|
|
" there is a single PCI bus with only the exported devices on it.\n"\
|
|
" For example, a device at 03:05.0 will be re-assigned to 00:00.0\n"\
|
|
" while second device at 02:1a.1 will be re-assigned to 00:01.1.\n"\
|
|
" 1 - Passthrough provides a real view of the PCI topology to the\n"\
|
|
" frontend (for example, a device at 06:01.b will still appear at\n"\
|
|
" 06:01.b to the frontend). This is similar to how Xen 2.0.x\n"\
|
|
" exposed PCI devices to its driver domains. This may be required\n"\
|
|
" for drivers which depend on finding their hardward in certain\n"\
|
|
" bus/slot locations.");
|
|
|
|
static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev)
|
|
{
|
|
struct xen_pcibk_device *pdev;
|
|
|
|
pdev = kzalloc(sizeof(struct xen_pcibk_device), GFP_KERNEL);
|
|
if (pdev == NULL)
|
|
goto out;
|
|
dev_dbg(&xdev->dev, "allocated pdev @ 0x%p\n", pdev);
|
|
|
|
pdev->xdev = xdev;
|
|
dev_set_drvdata(&xdev->dev, pdev);
|
|
|
|
mutex_init(&pdev->dev_lock);
|
|
|
|
pdev->sh_info = NULL;
|
|
pdev->evtchn_irq = INVALID_EVTCHN_IRQ;
|
|
pdev->be_watching = 0;
|
|
|
|
INIT_WORK(&pdev->op_work, xen_pcibk_do_op);
|
|
|
|
if (xen_pcibk_init_devices(pdev)) {
|
|
kfree(pdev);
|
|
pdev = NULL;
|
|
}
|
|
out:
|
|
return pdev;
|
|
}
|
|
|
|
static void xen_pcibk_disconnect(struct xen_pcibk_device *pdev)
|
|
{
|
|
mutex_lock(&pdev->dev_lock);
|
|
/* Ensure the guest can't trigger our handler before removing devices */
|
|
if (pdev->evtchn_irq != INVALID_EVTCHN_IRQ) {
|
|
unbind_from_irqhandler(pdev->evtchn_irq, pdev);
|
|
pdev->evtchn_irq = INVALID_EVTCHN_IRQ;
|
|
}
|
|
|
|
/* If the driver domain started an op, make sure we complete it
|
|
* before releasing the shared memory */
|
|
|
|
/* Note, the workqueue does not use spinlocks at all.*/
|
|
flush_workqueue(xen_pcibk_wq);
|
|
|
|
if (pdev->sh_info != NULL) {
|
|
xenbus_unmap_ring_vfree(pdev->xdev, pdev->sh_info);
|
|
pdev->sh_info = NULL;
|
|
}
|
|
mutex_unlock(&pdev->dev_lock);
|
|
}
|
|
|
|
static void free_pdev(struct xen_pcibk_device *pdev)
|
|
{
|
|
if (pdev->be_watching) {
|
|
unregister_xenbus_watch(&pdev->be_watch);
|
|
pdev->be_watching = 0;
|
|
}
|
|
|
|
xen_pcibk_disconnect(pdev);
|
|
|
|
xen_pcibk_release_devices(pdev);
|
|
|
|
dev_set_drvdata(&pdev->xdev->dev, NULL);
|
|
pdev->xdev = NULL;
|
|
|
|
kfree(pdev);
|
|
}
|
|
|
|
static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref,
|
|
int remote_evtchn)
|
|
{
|
|
int err = 0;
|
|
void *vaddr;
|
|
|
|
dev_dbg(&pdev->xdev->dev,
|
|
"Attaching to frontend resources - gnt_ref=%d evtchn=%d\n",
|
|
gnt_ref, remote_evtchn);
|
|
|
|
err = xenbus_map_ring_valloc(pdev->xdev, gnt_ref, &vaddr);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error mapping other domain page in ours.");
|
|
goto out;
|
|
}
|
|
|
|
pdev->sh_info = vaddr;
|
|
|
|
err = bind_interdomain_evtchn_to_irqhandler(
|
|
pdev->xdev->otherend_id, remote_evtchn, xen_pcibk_handle_event,
|
|
0, DRV_NAME, pdev);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error binding event channel to IRQ");
|
|
goto out;
|
|
}
|
|
pdev->evtchn_irq = err;
|
|
err = 0;
|
|
|
|
dev_dbg(&pdev->xdev->dev, "Attached!\n");
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int xen_pcibk_attach(struct xen_pcibk_device *pdev)
|
|
{
|
|
int err = 0;
|
|
int gnt_ref, remote_evtchn;
|
|
char *magic = NULL;
|
|
|
|
|
|
mutex_lock(&pdev->dev_lock);
|
|
/* Make sure we only do this setup once */
|
|
if (xenbus_read_driver_state(pdev->xdev->nodename) !=
|
|
XenbusStateInitialised)
|
|
goto out;
|
|
|
|
/* Wait for frontend to state that it has published the configuration */
|
|
if (xenbus_read_driver_state(pdev->xdev->otherend) !=
|
|
XenbusStateInitialised)
|
|
goto out;
|
|
|
|
dev_dbg(&pdev->xdev->dev, "Reading frontend config\n");
|
|
|
|
err = xenbus_gather(XBT_NIL, pdev->xdev->otherend,
|
|
"pci-op-ref", "%u", &gnt_ref,
|
|
"event-channel", "%u", &remote_evtchn,
|
|
"magic", NULL, &magic, NULL);
|
|
if (err) {
|
|
/* If configuration didn't get read correctly, wait longer */
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading configuration from frontend");
|
|
goto out;
|
|
}
|
|
|
|
if (magic == NULL || strcmp(magic, XEN_PCI_MAGIC) != 0) {
|
|
xenbus_dev_fatal(pdev->xdev, -EFAULT,
|
|
"version mismatch (%s/%s) with pcifront - "
|
|
"halting " DRV_NAME,
|
|
magic, XEN_PCI_MAGIC);
|
|
goto out;
|
|
}
|
|
|
|
err = xen_pcibk_do_attach(pdev, gnt_ref, remote_evtchn);
|
|
if (err)
|
|
goto out;
|
|
|
|
dev_dbg(&pdev->xdev->dev, "Connecting...\n");
|
|
|
|
err = xenbus_switch_state(pdev->xdev, XenbusStateConnected);
|
|
if (err)
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error switching to connected state!");
|
|
|
|
dev_dbg(&pdev->xdev->dev, "Connected? %d\n", err);
|
|
out:
|
|
mutex_unlock(&pdev->dev_lock);
|
|
|
|
kfree(magic);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int xen_pcibk_publish_pci_dev(struct xen_pcibk_device *pdev,
|
|
unsigned int domain, unsigned int bus,
|
|
unsigned int devfn, unsigned int devid)
|
|
{
|
|
int err;
|
|
int len;
|
|
char str[64];
|
|
|
|
len = snprintf(str, sizeof(str), "vdev-%d", devid);
|
|
if (unlikely(len >= (sizeof(str) - 1))) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Note: The PV protocol uses %02x, don't change it */
|
|
err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, str,
|
|
"%04x:%02x:%02x.%02x", domain, bus,
|
|
PCI_SLOT(devfn), PCI_FUNC(devfn));
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int xen_pcibk_export_device(struct xen_pcibk_device *pdev,
|
|
int domain, int bus, int slot, int func,
|
|
int devid)
|
|
{
|
|
struct pci_dev *dev;
|
|
int err = 0;
|
|
|
|
dev_dbg(&pdev->xdev->dev, "exporting dom %x bus %x slot %x func %x\n",
|
|
domain, bus, slot, func);
|
|
|
|
dev = pcistub_get_pci_dev_by_slot(pdev, domain, bus, slot, func);
|
|
if (!dev) {
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Couldn't locate PCI device "
|
|
"(%04x:%02x:%02x.%d)! "
|
|
"perhaps already in-use?",
|
|
domain, bus, slot, func);
|
|
goto out;
|
|
}
|
|
|
|
err = xen_pcibk_add_pci_dev(pdev, dev, devid,
|
|
xen_pcibk_publish_pci_dev);
|
|
if (err)
|
|
goto out;
|
|
|
|
dev_dbg(&dev->dev, "registering for %d\n", pdev->xdev->otherend_id);
|
|
if (xen_register_device_domain_owner(dev,
|
|
pdev->xdev->otherend_id) != 0) {
|
|
dev_err(&dev->dev, "Stealing ownership from dom%d.\n",
|
|
xen_find_device_domain_owner(dev));
|
|
xen_unregister_device_domain_owner(dev);
|
|
xen_register_device_domain_owner(dev, pdev->xdev->otherend_id);
|
|
}
|
|
|
|
/* TODO: It'd be nice to export a bridge and have all of its children
|
|
* get exported with it. This may be best done in xend (which will
|
|
* have to calculate resource usage anyway) but we probably want to
|
|
* put something in here to ensure that if a bridge gets given to a
|
|
* driver domain, that all devices under that bridge are not given
|
|
* to other driver domains (as he who controls the bridge can disable
|
|
* it and stop the other devices from working).
|
|
*/
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int xen_pcibk_remove_device(struct xen_pcibk_device *pdev,
|
|
int domain, int bus, int slot, int func)
|
|
{
|
|
int err = 0;
|
|
struct pci_dev *dev;
|
|
|
|
dev_dbg(&pdev->xdev->dev, "removing dom %x bus %x slot %x func %x\n",
|
|
domain, bus, slot, func);
|
|
|
|
dev = xen_pcibk_get_pci_dev(pdev, domain, bus, PCI_DEVFN(slot, func));
|
|
if (!dev) {
|
|
err = -EINVAL;
|
|
dev_dbg(&pdev->xdev->dev, "Couldn't locate PCI device "
|
|
"(%04x:%02x:%02x.%d)! not owned by this domain\n",
|
|
domain, bus, slot, func);
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(&dev->dev, "unregistering for %d\n", pdev->xdev->otherend_id);
|
|
xen_unregister_device_domain_owner(dev);
|
|
|
|
xen_pcibk_release_pci_dev(pdev, dev);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int xen_pcibk_publish_pci_root(struct xen_pcibk_device *pdev,
|
|
unsigned int domain, unsigned int bus)
|
|
{
|
|
unsigned int d, b;
|
|
int i, root_num, len, err;
|
|
char str[64];
|
|
|
|
dev_dbg(&pdev->xdev->dev, "Publishing pci roots\n");
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename,
|
|
"root_num", "%d", &root_num);
|
|
if (err == 0 || err == -ENOENT)
|
|
root_num = 0;
|
|
else if (err < 0)
|
|
goto out;
|
|
|
|
/* Verify that we haven't already published this pci root */
|
|
for (i = 0; i < root_num; i++) {
|
|
len = snprintf(str, sizeof(str), "root-%d", i);
|
|
if (unlikely(len >= (sizeof(str) - 1))) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename,
|
|
str, "%x:%x", &d, &b);
|
|
if (err < 0)
|
|
goto out;
|
|
if (err != 2) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (d == domain && b == bus) {
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
len = snprintf(str, sizeof(str), "root-%d", root_num);
|
|
if (unlikely(len >= (sizeof(str) - 1))) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(&pdev->xdev->dev, "writing root %d at %04x:%02x\n",
|
|
root_num, domain, bus);
|
|
|
|
err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, str,
|
|
"%04x:%02x", domain, bus);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = xenbus_printf(XBT_NIL, pdev->xdev->nodename,
|
|
"root_num", "%d", (root_num + 1));
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int xen_pcibk_reconfigure(struct xen_pcibk_device *pdev)
|
|
{
|
|
int err = 0;
|
|
int num_devs;
|
|
int domain, bus, slot, func;
|
|
int substate;
|
|
int i, len;
|
|
char state_str[64];
|
|
char dev_str[64];
|
|
|
|
|
|
dev_dbg(&pdev->xdev->dev, "Reconfiguring device ...\n");
|
|
|
|
mutex_lock(&pdev->dev_lock);
|
|
/* Make sure we only reconfigure once */
|
|
if (xenbus_read_driver_state(pdev->xdev->nodename) !=
|
|
XenbusStateReconfiguring)
|
|
goto out;
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, "num_devs", "%d",
|
|
&num_devs);
|
|
if (err != 1) {
|
|
if (err >= 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading number of devices");
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < num_devs; i++) {
|
|
len = snprintf(state_str, sizeof(state_str), "state-%d", i);
|
|
if (unlikely(len >= (sizeof(state_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"String overflow while reading "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, state_str,
|
|
"%d", &substate);
|
|
if (err != 1)
|
|
substate = XenbusStateUnknown;
|
|
|
|
switch (substate) {
|
|
case XenbusStateInitialising:
|
|
dev_dbg(&pdev->xdev->dev, "Attaching dev-%d ...\n", i);
|
|
|
|
len = snprintf(dev_str, sizeof(dev_str), "dev-%d", i);
|
|
if (unlikely(len >= (sizeof(dev_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"String overflow while "
|
|
"reading configuration");
|
|
goto out;
|
|
}
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename,
|
|
dev_str, "%x:%x:%x.%x",
|
|
&domain, &bus, &slot, &func);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
if (err != 4) {
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error parsing pci device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
|
|
err = xen_pcibk_export_device(pdev, domain, bus, slot,
|
|
func, i);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Publish pci roots. */
|
|
err = xen_pcibk_publish_pci_roots(pdev,
|
|
xen_pcibk_publish_pci_root);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error while publish PCI root"
|
|
"buses for frontend");
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_printf(XBT_NIL, pdev->xdev->nodename,
|
|
state_str, "%d",
|
|
XenbusStateInitialised);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error switching substate of "
|
|
"dev-%d\n", i);
|
|
goto out;
|
|
}
|
|
break;
|
|
|
|
case XenbusStateClosing:
|
|
dev_dbg(&pdev->xdev->dev, "Detaching dev-%d ...\n", i);
|
|
|
|
len = snprintf(dev_str, sizeof(dev_str), "vdev-%d", i);
|
|
if (unlikely(len >= (sizeof(dev_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"String overflow while "
|
|
"reading configuration");
|
|
goto out;
|
|
}
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename,
|
|
dev_str, "%x:%x:%x.%x",
|
|
&domain, &bus, &slot, &func);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
if (err != 4) {
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error parsing pci device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
|
|
err = xen_pcibk_remove_device(pdev, domain, bus, slot,
|
|
func);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* TODO: If at some point we implement support for pci
|
|
* root hot-remove on pcifront side, we'll need to
|
|
* remove unnecessary xenstore nodes of pci roots here.
|
|
*/
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
err = xenbus_switch_state(pdev->xdev, XenbusStateReconfigured);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error switching to reconfigured state!");
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&pdev->dev_lock);
|
|
return 0;
|
|
}
|
|
|
|
static void xen_pcibk_frontend_changed(struct xenbus_device *xdev,
|
|
enum xenbus_state fe_state)
|
|
{
|
|
struct xen_pcibk_device *pdev = dev_get_drvdata(&xdev->dev);
|
|
|
|
dev_dbg(&xdev->dev, "fe state changed %d\n", fe_state);
|
|
|
|
switch (fe_state) {
|
|
case XenbusStateInitialised:
|
|
xen_pcibk_attach(pdev);
|
|
break;
|
|
|
|
case XenbusStateReconfiguring:
|
|
xen_pcibk_reconfigure(pdev);
|
|
break;
|
|
|
|
case XenbusStateConnected:
|
|
/* pcifront switched its state from reconfiguring to connected.
|
|
* Then switch to connected state.
|
|
*/
|
|
xenbus_switch_state(xdev, XenbusStateConnected);
|
|
break;
|
|
|
|
case XenbusStateClosing:
|
|
xen_pcibk_disconnect(pdev);
|
|
xenbus_switch_state(xdev, XenbusStateClosing);
|
|
break;
|
|
|
|
case XenbusStateClosed:
|
|
xen_pcibk_disconnect(pdev);
|
|
xenbus_switch_state(xdev, XenbusStateClosed);
|
|
if (xenbus_dev_is_online(xdev))
|
|
break;
|
|
/* fall through if not online */
|
|
case XenbusStateUnknown:
|
|
dev_dbg(&xdev->dev, "frontend is gone! unregister device\n");
|
|
device_unregister(&xdev->dev);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int xen_pcibk_setup_backend(struct xen_pcibk_device *pdev)
|
|
{
|
|
/* Get configuration from xend (if available now) */
|
|
int domain, bus, slot, func;
|
|
int err = 0;
|
|
int i, num_devs;
|
|
char dev_str[64];
|
|
char state_str[64];
|
|
|
|
mutex_lock(&pdev->dev_lock);
|
|
/* It's possible we could get the call to setup twice, so make sure
|
|
* we're not already connected.
|
|
*/
|
|
if (xenbus_read_driver_state(pdev->xdev->nodename) !=
|
|
XenbusStateInitWait)
|
|
goto out;
|
|
|
|
dev_dbg(&pdev->xdev->dev, "getting be setup\n");
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, "num_devs", "%d",
|
|
&num_devs);
|
|
if (err != 1) {
|
|
if (err >= 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading number of devices");
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < num_devs; i++) {
|
|
int l = snprintf(dev_str, sizeof(dev_str), "dev-%d", i);
|
|
if (unlikely(l >= (sizeof(dev_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"String overflow while reading "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, dev_str,
|
|
"%x:%x:%x.%x", &domain, &bus, &slot, &func);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading device configuration");
|
|
goto out;
|
|
}
|
|
if (err != 4) {
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error parsing pci device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
|
|
err = xen_pcibk_export_device(pdev, domain, bus, slot, func, i);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Switch substate of this device. */
|
|
l = snprintf(state_str, sizeof(state_str), "state-%d", i);
|
|
if (unlikely(l >= (sizeof(state_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"String overflow while reading "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, state_str,
|
|
"%d", XenbusStateInitialised);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err, "Error switching "
|
|
"substate of dev-%d\n", i);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
err = xen_pcibk_publish_pci_roots(pdev, xen_pcibk_publish_pci_root);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error while publish PCI root buses "
|
|
"for frontend");
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
|
|
if (err)
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error switching to initialised state!");
|
|
|
|
out:
|
|
mutex_unlock(&pdev->dev_lock);
|
|
if (!err)
|
|
/* see if pcifront is already configured (if not, we'll wait) */
|
|
xen_pcibk_attach(pdev);
|
|
return err;
|
|
}
|
|
|
|
static void xen_pcibk_be_watch(struct xenbus_watch *watch,
|
|
const char **vec, unsigned int len)
|
|
{
|
|
struct xen_pcibk_device *pdev =
|
|
container_of(watch, struct xen_pcibk_device, be_watch);
|
|
|
|
switch (xenbus_read_driver_state(pdev->xdev->nodename)) {
|
|
case XenbusStateInitWait:
|
|
xen_pcibk_setup_backend(pdev);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int xen_pcibk_xenbus_probe(struct xenbus_device *dev,
|
|
const struct xenbus_device_id *id)
|
|
{
|
|
int err = 0;
|
|
struct xen_pcibk_device *pdev = alloc_pdev(dev);
|
|
|
|
if (pdev == NULL) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(dev, err,
|
|
"Error allocating xen_pcibk_device struct");
|
|
goto out;
|
|
}
|
|
|
|
/* wait for xend to configure us */
|
|
err = xenbus_switch_state(dev, XenbusStateInitWait);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* watch the backend node for backend configuration information */
|
|
err = xenbus_watch_path(dev, dev->nodename, &pdev->be_watch,
|
|
xen_pcibk_be_watch);
|
|
if (err)
|
|
goto out;
|
|
|
|
pdev->be_watching = 1;
|
|
|
|
/* We need to force a call to our callback here in case
|
|
* xend already configured us!
|
|
*/
|
|
xen_pcibk_be_watch(&pdev->be_watch, NULL, 0);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int xen_pcibk_xenbus_remove(struct xenbus_device *dev)
|
|
{
|
|
struct xen_pcibk_device *pdev = dev_get_drvdata(&dev->dev);
|
|
|
|
if (pdev != NULL)
|
|
free_pdev(pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct xenbus_device_id xen_pcibk_ids[] = {
|
|
{"pci"},
|
|
{""},
|
|
};
|
|
|
|
static DEFINE_XENBUS_DRIVER(xen_pcibk, DRV_NAME,
|
|
.probe = xen_pcibk_xenbus_probe,
|
|
.remove = xen_pcibk_xenbus_remove,
|
|
.otherend_changed = xen_pcibk_frontend_changed,
|
|
);
|
|
|
|
const struct xen_pcibk_backend *__read_mostly xen_pcibk_backend;
|
|
|
|
int __init xen_pcibk_xenbus_register(void)
|
|
{
|
|
xen_pcibk_wq = create_workqueue("xen_pciback_workqueue");
|
|
if (!xen_pcibk_wq) {
|
|
pr_err("%s: create xen_pciback_workqueue failed\n", __func__);
|
|
return -EFAULT;
|
|
}
|
|
xen_pcibk_backend = &xen_pcibk_vpci_backend;
|
|
if (passthrough)
|
|
xen_pcibk_backend = &xen_pcibk_passthrough_backend;
|
|
pr_info("backend is %s\n", xen_pcibk_backend->name);
|
|
return xenbus_register_backend(&xen_pcibk_driver);
|
|
}
|
|
|
|
void __exit xen_pcibk_xenbus_unregister(void)
|
|
{
|
|
destroy_workqueue(xen_pcibk_wq);
|
|
xenbus_unregister_driver(&xen_pcibk_driver);
|
|
}
|