xref: /illumos-gate/usr/src/uts/intel/io/vmm/amd/amdiommu.c (revision 0245b61fd282e95735b173b8d95be0d6688163b4)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2021 The FreeBSD Foundation
5  *
6  * Portions of this software were developed by Ka Ho Ng
7  * under sponsorship from the FreeBSD Foundation.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice unmodified, this list of conditions, and the following
14  *    disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33 
34 #include <sys/param.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/rman.h>
39 
40 #include <dev/pci/pcireg.h>
41 #include <dev/pci/pcivar.h>
42 
43 #include "amdvi_priv.h"
44 #include "ivhd_if.h"
45 
46 struct amdiommu_softc {
47 	struct resource *event_res;	/* Event interrupt resource. */
48 	void		*event_tag;	/* Event interrupt tag. */
49 	int		event_rid;
50 };
51 
52 static int	amdiommu_probe(device_t);
53 static int	amdiommu_attach(device_t);
54 static int	amdiommu_detach(device_t);
55 static int	ivhd_setup_intr(device_t, driver_intr_t, void *,
56 		    const char *);
57 static int	ivhd_teardown_intr(device_t);
58 
59 static device_method_t amdiommu_methods[] = {
60 	/* device interface */
61 	DEVMETHOD(device_probe,			amdiommu_probe),
62 	DEVMETHOD(device_attach,		amdiommu_attach),
63 	DEVMETHOD(device_detach,		amdiommu_detach),
64 	DEVMETHOD(ivhd_setup_intr,		ivhd_setup_intr),
65 	DEVMETHOD(ivhd_teardown_intr,		ivhd_teardown_intr),
66 	DEVMETHOD_END
67 };
68 static driver_t amdiommu_driver = {
69 	"amdiommu",
70 	amdiommu_methods,
71 	sizeof (struct amdiommu_softc),
72 };
73 
74 static int
75 amdiommu_probe(device_t dev)
76 {
77 	int error;
78 	int capoff;
79 
80 	/*
81 	 * Check base class and sub-class
82 	 */
83 	if (pci_get_class(dev) != PCIC_BASEPERIPH ||
84 	    pci_get_subclass(dev) != PCIS_BASEPERIPH_IOMMU)
85 		return (ENXIO);
86 
87 	/*
88 	 * A IOMMU capability block carries a 0Fh capid.
89 	 */
90 	error = pci_find_cap(dev, PCIY_SECDEV, &capoff);
91 	if (error)
92 		return (ENXIO);
93 
94 	/*
95 	 * bit [18:16] == 011b indicates the capability block is IOMMU
96 	 * capability block. If the field is not set to 011b, bail out.
97 	 */
98 	if ((pci_read_config(dev, capoff + 2, 2) & 0x7) != 0x3)
99 		return (ENXIO);
100 
101 	return (BUS_PROBE_SPECIFIC);
102 }
103 
104 static int
105 amdiommu_attach(device_t dev)
106 {
107 
108 	device_set_desc(dev, "AMD-Vi/IOMMU PCI function");
109 	return (0);
110 }
111 
112 static int
113 amdiommu_detach(device_t dev)
114 {
115 
116 	return (0);
117 }
118 
119 static int
120 ivhd_setup_intr(device_t dev, driver_intr_t handler, void *arg,
121     const char *desc)
122 {
123 	struct amdiommu_softc *sc;
124 	int error, msicnt;
125 
126 	sc = device_get_softc(dev);
127 	msicnt = 1;
128 	if (sc->event_res != NULL)
129 		panic("%s is called without intr teardown", __func__);
130 	sc->event_rid = 1;
131 
132 	error = pci_alloc_msi(dev, &msicnt);
133 	if (error) {
134 		device_printf(dev, "Couldn't find event MSI IRQ resource.\n");
135 		return (ENOENT);
136 	}
137 
138 	sc->event_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
139 	    &sc->event_rid, RF_ACTIVE);
140 	if (sc->event_res == NULL) {
141 		device_printf(dev, "Unable to allocate event INTR resource.\n");
142 		error = ENOMEM;
143 		goto fail;
144 	}
145 
146 	error = bus_setup_intr(dev, sc->event_res, INTR_TYPE_MISC | INTR_MPSAFE,
147 	    NULL, handler, arg, &sc->event_tag);
148 	if (error) {
149 		device_printf(dev, "Fail to setup event intr\n");
150 		goto fail;
151 	}
152 
153 	bus_describe_intr(dev, sc->event_res, sc->event_tag, "%s", desc);
154 	return (0);
155 
156 fail:
157 	ivhd_teardown_intr(dev);
158 	return (error);
159 }
160 
161 static int
162 ivhd_teardown_intr(device_t dev)
163 {
164 	struct amdiommu_softc *sc;
165 
166 	sc = device_get_softc(dev);
167 
168 	if (sc->event_tag != NULL) {
169 		bus_teardown_intr(dev, sc->event_res, sc->event_tag);
170 		sc->event_tag = NULL;
171 	}
172 	if (sc->event_res != NULL) {
173 		bus_release_resource(dev, SYS_RES_IRQ, sc->event_rid,
174 		    sc->event_res);
175 		sc->event_res = NULL;
176 	}
177 	pci_release_msi(dev);
178 	return (0);
179 }
180 
181 static devclass_t amdiommu_devclass;
182 
183 /* This driver has to be loaded before ivhd */
184 DRIVER_MODULE(amdiommu, pci, amdiommu_driver, amdiommu_devclass, 0, 0);
185 MODULE_DEPEND(amdiommu, pci, 1, 1, 1);
186