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/*-
* Copyright (C) 2018 Justin Hibbits
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 TOOLS GMBH 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/types.h>
#include <sys/bus.h>
#include <sys/kthread.h>
#include <sys/proc.h>
#include <sys/selinfo.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <sys/ipmi.h>
#include <dev/ipmi/ipmivars.h>
#include <powerpc/powernv/opal.h>
struct opal_ipmi_softc {
struct ipmi_softc ipmi;
uint64_t sc_interface;
struct opal_ipmi_msg *sc_msg; /* Protected by IPMI lock */
};
static MALLOC_DEFINE(M_IPMI, "ipmi", "OPAL IPMI");
static int
opal_ipmi_polled_request(struct opal_ipmi_softc *sc, struct ipmi_request *req,
int timo)
{
uint64_t msg_len;
int err;
/* Construct and send the message. */
sc->sc_msg->version = OPAL_IPMI_MSG_FORMAT_VERSION_1;
sc->sc_msg->netfn = req->ir_addr;
sc->sc_msg->cmd = req->ir_command;
if (req->ir_requestlen > IPMI_MAX_RX) {
err = ENOMEM;
goto out;
}
memcpy(sc->sc_msg->data, req->ir_request, req->ir_requestlen);
msg_len = sizeof(*sc->sc_msg) + req->ir_requestlen;
err = opal_call(OPAL_IPMI_SEND, sc->sc_interface, vtophys(sc->sc_msg),
msg_len);
switch (err) {
case OPAL_SUCCESS:
break;
case OPAL_PARAMETER:
err = EINVAL;
goto out;
case OPAL_HARDWARE:
err = EIO;
goto out;
case OPAL_UNSUPPORTED:
err = EINVAL;
goto out;
case OPAL_RESOURCE:
err = ENOMEM;
goto out;
}
timo *= 10; /* Timeout is in milliseconds, we delay in 100us */
do {
msg_len = sizeof(struct opal_ipmi_msg) + IPMI_MAX_RX;
err = opal_call(OPAL_IPMI_RECV, sc->sc_interface,
vtophys(sc->sc_msg), vtophys(&msg_len));
if (err != OPAL_EMPTY)
break;
DELAY(100);
} while (err == OPAL_EMPTY && timo-- != 0);
switch (err) {
case OPAL_SUCCESS:
/* Subtract one extra for the completion code. */
req->ir_replylen = msg_len - sizeof(struct opal_ipmi_msg) - 1;
req->ir_replylen = min(req->ir_replylen, req->ir_replybuflen);
memcpy(req->ir_reply, &sc->sc_msg->data[1], req->ir_replylen);
req->ir_compcode = sc->sc_msg->data[0];
break;
case OPAL_RESOURCE:
err = ENOMEM;
break;
case OPAL_EMPTY:
err = EAGAIN;
break;
default:
err = EIO;
break;
}
out:
return (err);
}
static int
opal_ipmi_probe(device_t dev)
{
if (!ofw_bus_is_compatible(dev, "ibm,opal-ipmi"))
return (ENXIO);
device_set_desc(dev, "OPAL IPMI System Interface");
return (BUS_PROBE_DEFAULT);
}
static void
opal_ipmi_loop(void *arg)
{
struct opal_ipmi_softc *sc = arg;
struct ipmi_request *req;
int i, ok;
IPMI_LOCK(&sc->ipmi);
while ((req = ipmi_dequeue_request(&sc->ipmi)) != NULL) {
IPMI_UNLOCK(&sc->ipmi);
ok = 0;
for (i = 0; i < 3 && !ok; i++) {
IPMI_IO_LOCK(&sc->ipmi);
ok = opal_ipmi_polled_request(sc, req, MAX_TIMEOUT);
IPMI_IO_UNLOCK(&sc->ipmi);
}
if (ok)
req->ir_error = 0;
else
req->ir_error = EIO;
IPMI_LOCK(&sc->ipmi);
ipmi_complete_request(&sc->ipmi, req);
}
IPMI_UNLOCK(&sc->ipmi);
kproc_exit(0);
}
static int
opal_ipmi_startup(struct ipmi_softc *sc)
{
return (kproc_create(opal_ipmi_loop, sc, &sc->ipmi_kthread, 0, 0,
"%s: opal", device_get_nameunit(sc->ipmi_dev)));
}
static int
opal_ipmi_driver_request(struct ipmi_softc *isc, struct ipmi_request *req,
int timo)
{
struct opal_ipmi_softc *sc = (struct opal_ipmi_softc *)isc;
int i, err;
for (i = 0; i < 3; i++) {
IPMI_LOCK(&sc->ipmi);
err = opal_ipmi_polled_request(sc, req, timo);
IPMI_UNLOCK(&sc->ipmi);
if (err == 0)
break;
}
req->ir_error = err;
return (err);
}
static int
opal_ipmi_attach(device_t dev)
{
struct opal_ipmi_softc *sc;
sc = device_get_softc(dev);
if (OF_getencprop(ofw_bus_get_node(dev), "ibm,ipmi-interface-id",
(pcell_t*)&sc->sc_interface, sizeof(sc->sc_interface)) < 0) {
device_printf(dev, "Missing interface id\n");
return (ENXIO);
}
sc->ipmi.ipmi_startup = opal_ipmi_startup;
sc->ipmi.ipmi_driver_request = opal_ipmi_driver_request;
sc->ipmi.ipmi_enqueue_request = ipmi_polled_enqueue_request;
sc->ipmi.ipmi_driver_requests_polled = 1;
sc->ipmi.ipmi_dev = dev;
sc->sc_msg = malloc(sizeof(struct opal_ipmi_msg) + IPMI_MAX_RX, M_IPMI,
M_WAITOK | M_ZERO);
return (ipmi_attach(dev));
}
static int
opal_ipmi_detach(device_t dev)
{
return (EBUSY);
}
static device_method_t opal_ipmi_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, opal_ipmi_probe),
DEVMETHOD(device_attach, opal_ipmi_attach),
DEVMETHOD(device_detach, opal_ipmi_detach),
DEVMETHOD_END
};
static driver_t opal_ipmi_driver = {
"ipmi",
opal_ipmi_methods,
sizeof(struct opal_ipmi_softc)
};
DRIVER_MODULE(opal_ipmi, opal, opal_ipmi_driver, ipmi_devclass, NULL, NULL);
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