| Current Path : /sys/dev/xen/pcifront/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/dev/xen/pcifront/pcifront.c |
/*
* Copyright (c) 2006, Cisco Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Cisco Systems, Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/xen/pcifront/pcifront.c 229093 2011-12-31 14:12:12Z hselasky $");
#include <sys/param.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <machine/vmparam.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <machine/frame.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <machine/intr_machdep.h>
#include <machine/xen-os.h>
#include <machine/hypervisor.h>
#include <machine/hypervisor-ifs.h>
#include <machine/xen_intr.h>
#include <machine/evtchn.h>
#include <machine/xenbus.h>
#include <machine/gnttab.h>
#include <machine/xen-public/memory.h>
#include <machine/xen-public/io/pciif.h>
#include <sys/pciio.h>
#include <dev/pci/pcivar.h>
#include "pcib_if.h"
#ifdef XEN_PCIDEV_FE_DEBUG
#define DPRINTF(fmt, args...) \
printf("pcifront (%s:%d): " fmt, __FUNCTION__, __LINE__, ##args)
#else
#define DPRINTF(fmt, args...) ((void)0)
#endif
#define WPRINTF(fmt, args...) \
printf("pcifront (%s:%d): " fmt, __FUNCTION__, __LINE__, ##args)
#define INVALID_GRANT_REF (0)
#define INVALID_EVTCHN (-1)
#define virt_to_mfn(x) (vtomach(x) >> PAGE_SHIFT)
struct pcifront_device {
STAILQ_ENTRY(pcifront_device) next;
struct xenbus_device *xdev;
int unit;
int evtchn;
int gnt_ref;
/* Lock this when doing any operations in sh_info */
struct mtx sh_info_lock;
struct xen_pci_sharedinfo *sh_info;
device_t ndev;
int ref_cnt;
};
static STAILQ_HEAD(pcifront_dlist, pcifront_device) pdev_list = STAILQ_HEAD_INITIALIZER(pdev_list);
struct xpcib_softc {
int domain;
int bus;
struct pcifront_device *pdev;
};
/* Allocate a PCI device structure */
static struct pcifront_device *
alloc_pdev(struct xenbus_device *xdev)
{
struct pcifront_device *pdev = NULL;
int err, unit;
err = sscanf(xdev->nodename, "device/pci/%d", &unit);
if (err != 1) {
if (err == 0)
err = -EINVAL;
xenbus_dev_fatal(pdev->xdev, err, "Error scanning pci device instance number");
goto out;
}
pdev = (struct pcifront_device *)malloc(sizeof(struct pcifront_device), M_DEVBUF, M_NOWAIT);
if (pdev == NULL) {
err = -ENOMEM;
xenbus_dev_fatal(xdev, err, "Error allocating pcifront_device struct");
goto out;
}
pdev->unit = unit;
pdev->xdev = xdev;
pdev->ref_cnt = 1;
pdev->sh_info = (struct xen_pci_sharedinfo *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT);
if (pdev->sh_info == NULL) {
free(pdev, M_DEVBUF);
pdev = NULL;
err = -ENOMEM;
xenbus_dev_fatal(xdev, err, "Error allocating sh_info struct");
goto out;
}
pdev->sh_info->flags = 0;
xdev->data = pdev;
mtx_init(&pdev->sh_info_lock, "info_lock", "pci shared dev info lock", MTX_DEF);
pdev->evtchn = INVALID_EVTCHN;
pdev->gnt_ref = INVALID_GRANT_REF;
STAILQ_INSERT_TAIL(&pdev_list, pdev, next);
DPRINTF("Allocated pdev @ 0x%p (unit=%d)\n", pdev, unit);
out:
return pdev;
}
/* Hold a reference to a pcifront device */
static void
get_pdev(struct pcifront_device *pdev)
{
pdev->ref_cnt++;
}
/* Release a reference to a pcifront device */
static void
put_pdev(struct pcifront_device *pdev)
{
if (--pdev->ref_cnt > 0)
return;
DPRINTF("freeing pdev @ 0x%p (ref_cnt=%d)\n", pdev, pdev->ref_cnt);
if (pdev->evtchn != INVALID_EVTCHN)
xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
if (pdev->gnt_ref != INVALID_GRANT_REF)
gnttab_end_foreign_access(pdev->gnt_ref, 0, (void *)pdev->sh_info);
pdev->xdev->data = NULL;
free(pdev, M_DEVBUF);
}
/* Write to the xenbus info needed by backend */
static int
pcifront_publish_info(struct pcifront_device *pdev)
{
int err = 0;
struct xenbus_transaction *trans;
err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info));
if (err < 0) {
WPRINTF("error granting access to ring page\n");
goto out;
}
pdev->gnt_ref = err;
err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
if (err)
goto out;
do_publish:
trans = xenbus_transaction_start();
if (IS_ERR(trans)) {
xenbus_dev_fatal(pdev->xdev, err,
"Error writing configuration for backend "
"(start transaction)");
goto out;
}
err = xenbus_printf(trans, pdev->xdev->nodename,
"pci-op-ref", "%u", pdev->gnt_ref);
if (!err)
err = xenbus_printf(trans, pdev->xdev->nodename,
"event-channel", "%u", pdev->evtchn);
if (!err)
err = xenbus_printf(trans, pdev->xdev->nodename,
"magic", XEN_PCI_MAGIC);
if (!err)
err = xenbus_switch_state(pdev->xdev, trans,
XenbusStateInitialised);
if (err) {
xenbus_transaction_end(trans, 1);
xenbus_dev_fatal(pdev->xdev, err,
"Error writing configuration for backend");
goto out;
} else {
err = xenbus_transaction_end(trans, 0);
if (err == -EAGAIN)
goto do_publish;
else if (err) {
xenbus_dev_fatal(pdev->xdev, err,
"Error completing transaction for backend");
goto out;
}
}
out:
return err;
}
/* The backend is now connected so complete the connection process on our side */
static int
pcifront_connect(struct pcifront_device *pdev)
{
device_t nexus;
devclass_t nexus_devclass;
/* We will add our device as a child of the nexus0 device */
if (!(nexus_devclass = devclass_find("nexus")) ||
!(nexus = devclass_get_device(nexus_devclass, 0))) {
WPRINTF("could not find nexus0!\n");
return -1;
}
/* Create a newbus device representing this frontend instance */
pdev->ndev = BUS_ADD_CHILD(nexus, 0, "xpcife", pdev->unit);
if (!pdev->ndev) {
WPRINTF("could not create xpcife%d!\n", pdev->unit);
return -EFAULT;
}
get_pdev(pdev);
device_set_ivars(pdev->ndev, pdev);
/* Good to go connected now */
xenbus_switch_state(pdev->xdev, NULL, XenbusStateConnected);
printf("pcifront: connected to %s\n", pdev->xdev->nodename);
mtx_lock(&Giant);
device_probe_and_attach(pdev->ndev);
mtx_unlock(&Giant);
return 0;
}
/* The backend is closing so process a disconnect */
static int
pcifront_disconnect(struct pcifront_device *pdev)
{
int err = 0;
XenbusState prev_state;
prev_state = xenbus_read_driver_state(pdev->xdev->nodename);
if (prev_state < XenbusStateClosing) {
err = xenbus_switch_state(pdev->xdev, NULL, XenbusStateClosing);
if (!err && prev_state == XenbusStateConnected) {
/* TODO - need to detach the newbus devices */
}
}
return err;
}
/* Process a probe from the xenbus */
static int
pcifront_probe(struct xenbus_device *xdev,
const struct xenbus_device_id *id)
{
int err = 0;
struct pcifront_device *pdev;
DPRINTF("xenbus probing\n");
if ((pdev = alloc_pdev(xdev)) == NULL)
goto out;
err = pcifront_publish_info(pdev);
out:
if (err)
put_pdev(pdev);
return err;
}
/* Remove the xenbus PCI device */
static int
pcifront_remove(struct xenbus_device *xdev)
{
DPRINTF("removing xenbus device node (%s)\n", xdev->nodename);
if (xdev->data)
put_pdev(xdev->data);
return 0;
}
/* Called by xenbus when our backend node changes state */
static void
pcifront_backend_changed(struct xenbus_device *xdev,
XenbusState be_state)
{
struct pcifront_device *pdev = xdev->data;
switch (be_state) {
case XenbusStateClosing:
DPRINTF("backend closing (%s)\n", xdev->nodename);
pcifront_disconnect(pdev);
break;
case XenbusStateClosed:
DPRINTF("backend closed (%s)\n", xdev->nodename);
pcifront_disconnect(pdev);
break;
case XenbusStateConnected:
DPRINTF("backend connected (%s)\n", xdev->nodename);
pcifront_connect(pdev);
break;
default:
break;
}
}
/* Process PCI operation */
static int
do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
{
int err = 0;
struct xen_pci_op *active_op = &pdev->sh_info->op;
evtchn_port_t port = pdev->evtchn;
time_t timeout;
mtx_lock(&pdev->sh_info_lock);
memcpy(active_op, op, sizeof(struct xen_pci_op));
/* Go */
wmb();
set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
notify_remote_via_evtchn(port);
timeout = time_uptime + 2;
clear_evtchn(port);
/* Spin while waiting for the answer */
while (test_bit
(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags)) {
int err = HYPERVISOR_poll(&port, 1, 3 * hz);
if (err)
panic("Failed HYPERVISOR_poll: err=%d", err);
clear_evtchn(port);
if (time_uptime > timeout) {
WPRINTF("pciback not responding!!!\n");
clear_bit(_XEN_PCIF_active,
(unsigned long *)&pdev->sh_info->flags);
err = XEN_PCI_ERR_dev_not_found;
goto out;
}
}
memcpy(op, active_op, sizeof(struct xen_pci_op));
err = op->err;
out:
mtx_unlock(&pdev->sh_info_lock);
return err;
}
/* ** XenBus Driver registration ** */
static struct xenbus_device_id pcifront_ids[] = {
{ "pci" },
{ "" }
};
static struct xenbus_driver pcifront = {
.name = "pcifront",
.ids = pcifront_ids,
.probe = pcifront_probe,
.remove = pcifront_remove,
.otherend_changed = pcifront_backend_changed,
};
/* Register the driver with xenbus during sys init */
static void
pcifront_init(void *unused)
{
if ((xen_start_info->flags & SIF_INITDOMAIN))
return;
DPRINTF("xenbus registering\n");
xenbus_register_frontend(&pcifront);
}
SYSINIT(pciif, SI_SUB_PSEUDO, SI_ORDER_ANY, pcifront_init, NULL)
/* Newbus xpcife device driver probe */
static int
xpcife_probe(device_t dev)
{
#ifdef XEN_PCIDEV_FE_DEBUG
struct pcifront_device *pdev = (struct pcifront_device *)device_get_ivars(dev);
DPRINTF("xpcife probe (unit=%d)\n", pdev->unit);
#endif
return 0;
}
/* Newbus xpcife device driver attach */
static int
xpcife_attach(device_t dev)
{
struct pcifront_device *pdev = (struct pcifront_device *)device_get_ivars(dev);
int i, num_roots, len, err;
char str[64];
unsigned int domain, bus;
DPRINTF("xpcife attach (unit=%d)\n", pdev->unit);
err = xenbus_scanf(NULL, pdev->xdev->otherend,
"root_num", "%d", &num_roots);
if (err != 1) {
if (err == 0)
err = -EINVAL;
xenbus_dev_fatal(pdev->xdev, err,
"Error reading number of PCI roots");
goto out;
}
/* Add a pcib device for each root */
for (i = 0; i < num_roots; i++) {
device_t child;
len = snprintf(str, sizeof(str), "root-%d", i);
if (unlikely(len >= (sizeof(str) - 1))) {
err = -ENOMEM;
goto out;
}
err = xenbus_scanf(NULL, pdev->xdev->otherend, str,
"%x:%x", &domain, &bus);
if (err != 2) {
if (err >= 0)
err = -EINVAL;
xenbus_dev_fatal(pdev->xdev, err,
"Error reading PCI root %d", i);
goto out;
}
err = 0;
if (domain != pdev->xdev->otherend_id) {
err = -EINVAL;
xenbus_dev_fatal(pdev->xdev, err,
"Domain mismatch %d != %d", domain, pdev->xdev->otherend_id);
goto out;
}
child = device_add_child(dev, "pcib", bus);
if (!child) {
err = -ENOMEM;
xenbus_dev_fatal(pdev->xdev, err,
"Unable to create pcib%d", bus);
goto out;
}
}
out:
return bus_generic_attach(dev);
}
static devclass_t xpcife_devclass;
static device_method_t xpcife_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, xpcife_probe),
DEVMETHOD(device_attach, xpcife_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD_END
};
static driver_t xpcife_driver = {
"xpcife",
xpcife_methods,
0,
};
DRIVER_MODULE(xpcife, nexus, xpcife_driver, xpcife_devclass, 0, 0);
/* Newbus xen pcib device driver probe */
static int
xpcib_probe(device_t dev)
{
struct xpcib_softc *sc = (struct xpcib_softc *)device_get_softc(dev);
struct pcifront_device *pdev = (struct pcifront_device *)device_get_ivars(device_get_parent(dev));
DPRINTF("xpcib probe (bus=%d)\n", device_get_unit(dev));
sc->domain = pdev->xdev->otherend_id;
sc->bus = device_get_unit(dev);
sc->pdev = pdev;
return 0;
}
/* Newbus xen pcib device driver attach */
static int
xpcib_attach(device_t dev)
{
struct xpcib_softc *sc = (struct xpcib_softc *)device_get_softc(dev);
DPRINTF("xpcib attach (bus=%d)\n", sc->bus);
device_add_child(dev, "pci", sc->bus);
return bus_generic_attach(dev);
}
static int
xpcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct xpcib_softc *sc = (struct xpcib_softc *)device_get_softc(dev);
switch (which) {
case PCIB_IVAR_BUS:
*result = sc->bus;
return 0;
}
return ENOENT;
}
/* Return the number of slots supported */
static int
xpcib_maxslots(device_t dev)
{
return 31;
}
#define PCI_DEVFN(slot,func) ((((slot) & 0x1f) << 3) | ((func) & 0x07))
/* Read configuration space register */
static u_int32_t
xpcib_read_config(device_t dev, int bus, int slot, int func,
int reg, int bytes)
{
struct xpcib_softc *sc = (struct xpcib_softc *)device_get_softc(dev);
struct xen_pci_op op = {
.cmd = XEN_PCI_OP_conf_read,
.domain = sc->domain,
.bus = sc->bus,
.devfn = PCI_DEVFN(slot, func),
.offset = reg,
.size = bytes,
};
int err;
err = do_pci_op(sc->pdev, &op);
DPRINTF("read config (b=%d, s=%d, f=%d, reg=%d, len=%d, val=%x, err=%d)\n",
bus, slot, func, reg, bytes, op.value, err);
if (err)
op.value = ~0;
return op.value;
}
/* Write configuration space register */
static void
xpcib_write_config(device_t dev, int bus, int slot, int func,
int reg, u_int32_t data, int bytes)
{
struct xpcib_softc *sc = (struct xpcib_softc *)device_get_softc(dev);
struct xen_pci_op op = {
.cmd = XEN_PCI_OP_conf_write,
.domain = sc->domain,
.bus = sc->bus,
.devfn = PCI_DEVFN(slot, func),
.offset = reg,
.size = bytes,
.value = data,
};
int err;
err = do_pci_op(sc->pdev, &op);
DPRINTF("write config (b=%d, s=%d, f=%d, reg=%d, len=%d, val=%x, err=%d)\n",
bus, slot, func, reg, bytes, data, err);
}
static int
xpcib_route_interrupt(device_t pcib, device_t dev, int pin)
{
struct pci_devinfo *dinfo = device_get_ivars(dev);
pcicfgregs *cfg = &dinfo->cfg;
DPRINTF("route intr (pin=%d, line=%d)\n", pin, cfg->intline);
return cfg->intline;
}
static device_method_t xpcib_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, xpcib_probe),
DEVMETHOD(device_attach, xpcib_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_read_ivar, xpcib_read_ivar),
DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
/* pcib interface */
DEVMETHOD(pcib_maxslots, xpcib_maxslots),
DEVMETHOD(pcib_read_config, xpcib_read_config),
DEVMETHOD(pcib_write_config, xpcib_write_config),
DEVMETHOD(pcib_route_interrupt, xpcib_route_interrupt),
DEVMETHOD_END
};
static devclass_t xpcib_devclass;
DEFINE_CLASS_0(pcib, xpcib_driver, xpcib_methods, sizeof(struct xpcib_softc));
DRIVER_MODULE(pcib, xpcife, xpcib_driver, xpcib_devclass, 0, 0);
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: t
* End:
*/