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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2021 The FreeBSD Foundation
*
* Portions of this software were developed by Ka Ho Ng
* under sponsorship from the FreeBSD Foundation.
*
* 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 unmodified, 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 THE AUTHOR 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/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include "amdvi_priv.h"
#include "ivhd_if.h"
struct amdiommu_softc {
struct resource *event_res; /* Event interrupt resource. */
void *event_tag; /* Event interrupt tag. */
int event_rid;
};
static int amdiommu_probe(device_t);
static int amdiommu_attach(device_t);
static int amdiommu_detach(device_t);
static int ivhd_setup_intr(device_t, driver_intr_t, void *,
const char *);
static int ivhd_teardown_intr(device_t);
static device_method_t amdiommu_methods[] = {
/* device interface */
DEVMETHOD(device_probe, amdiommu_probe),
DEVMETHOD(device_attach, amdiommu_attach),
DEVMETHOD(device_detach, amdiommu_detach),
DEVMETHOD(ivhd_setup_intr, ivhd_setup_intr),
DEVMETHOD(ivhd_teardown_intr, ivhd_teardown_intr),
DEVMETHOD_END
};
static driver_t amdiommu_driver = {
"amdiommu",
amdiommu_methods,
sizeof (struct amdiommu_softc),
};
static int
amdiommu_probe(device_t dev)
{
int error;
int capoff;
/*
* Check base class and sub-class
*/
if (pci_get_class(dev) != PCIC_BASEPERIPH ||
pci_get_subclass(dev) != PCIS_BASEPERIPH_IOMMU)
return (ENXIO);
/*
* A IOMMU capability block carries a 0Fh capid.
*/
error = pci_find_cap(dev, PCIY_SECDEV, &capoff);
if (error)
return (ENXIO);
/*
* bit [18:16] == 011b indicates the capability block is IOMMU
* capability block. If the field is not set to 011b, bail out.
*/
if ((pci_read_config(dev, capoff + 2, 2) & 0x7) != 0x3)
return (ENXIO);
return (BUS_PROBE_SPECIFIC);
}
static int
amdiommu_attach(device_t dev)
{
device_set_desc(dev, "AMD-Vi/IOMMU PCI function");
return (0);
}
static int
amdiommu_detach(device_t dev)
{
return (0);
}
static int
ivhd_setup_intr(device_t dev, driver_intr_t handler, void *arg,
const char *desc)
{
struct amdiommu_softc *sc;
int error, msicnt;
sc = device_get_softc(dev);
msicnt = 1;
if (sc->event_res != NULL)
panic("%s is called without intr teardown", __func__);
sc->event_rid = 1;
error = pci_alloc_msi(dev, &msicnt);
if (error) {
device_printf(dev, "Couldn't find event MSI IRQ resource.\n");
return (ENOENT);
}
sc->event_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
&sc->event_rid, RF_ACTIVE);
if (sc->event_res == NULL) {
device_printf(dev, "Unable to allocate event INTR resource.\n");
error = ENOMEM;
goto fail;
}
error = bus_setup_intr(dev, sc->event_res, INTR_TYPE_MISC | INTR_MPSAFE,
NULL, handler, arg, &sc->event_tag);
if (error) {
device_printf(dev, "Fail to setup event intr\n");
goto fail;
}
bus_describe_intr(dev, sc->event_res, sc->event_tag, "%s", desc);
return (0);
fail:
ivhd_teardown_intr(dev);
return (error);
}
static int
ivhd_teardown_intr(device_t dev)
{
struct amdiommu_softc *sc;
sc = device_get_softc(dev);
if (sc->event_tag != NULL) {
bus_teardown_intr(dev, sc->event_res, sc->event_tag);
sc->event_tag = NULL;
}
if (sc->event_res != NULL) {
bus_release_resource(dev, SYS_RES_IRQ, sc->event_rid,
sc->event_res);
sc->event_res = NULL;
}
pci_release_msi(dev);
return (0);
}
static devclass_t amdiommu_devclass;
/* This driver has to be loaded before ivhd */
DRIVER_MODULE(amdiommu, pci, amdiommu_driver, amdiommu_devclass, 0, 0);
MODULE_DEPEND(amdiommu, pci, 1, 1, 1);
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