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Differential D28984 Diff 86130 sys/amd64/vmm/amd/amdiommu.c

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sys/amd64/vmm/amd/amdiommu.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2021 The FreeBSD Fondation
*
* 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"
philipUnsubmitted
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style nit: alphabetise these headers too.

philip: style nit: alphabetise these headers too.
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");
philipUnsubmitted
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style nit: blank line after {

philip: style nit: blank line after {
khngAuthorUnsubmitted
Done
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This requirement seems optional in style(9) now:

static void
usage(void)
{
        /* Optional blank line goes here. */

Optionally, insert a blank line at the beginning of functions with no
local variables.  Older versions of this style document required the
blank line convention, so it is widely used in existing code.
khng: This requirement seems optional in style(9) now: static void usage(void) {…
return (0);
}
static int
amdiommu_detach(device_t dev)
{
philipUnsubmitted
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style nit: blank line after {

philip: style nit: blank line after {
khngAuthorUnsubmitted
Done
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The same as above.

khng: The same as above.
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_res != 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);