xref: /netbsd-src/sys/arch/x86/x86/mp.c (revision 76646d9e03c9615328f50b26f06c9b57e12e065b)
1 /*	$NetBSD: mp.c,v 1.7 2021/10/07 12:52:27 msaitoh Exp $	*/
2 
3 /*
4  * Copyright (c) 2003 Wasabi Systems, Inc.
5  * All rights reserved.
6  *
7  * Written by Frank van der Linden for Wasabi Systems, Inc.
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, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. All advertising materials mentioning features or use of this software
18  *    must display the following acknowledgement:
19  *      This product includes software developed for the NetBSD Project by
20  *      Wasabi Systems, Inc.
21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22  *    or promote products derived from this software without specific prior
23  *    written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35  * POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #include <sys/cdefs.h>
39 __KERNEL_RCSID(0, "$NetBSD: mp.c,v 1.7 2021/10/07 12:52:27 msaitoh Exp $");
40 
41 #include "opt_multiprocessor.h"
42 #include "opt_acpi.h"
43 
44 #include "acpica.h"
45 #include "ioapic.h"
46 #include "pchb.h"
47 
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/kernel.h>
51 #include <sys/device.h>
52 #include <sys/kmem.h>
53 #include <sys/queue.h>
54 
55 #include <machine/specialreg.h>
56 #include <machine/cpuvar.h>
57 #include <sys/bus.h>
58 #include <machine/mpconfig.h>
59 
60 #include <dev/pci/pcivar.h>
61 #include <dev/pci/pcidevs.h>
62 
63 #include "pci.h"
64 #include "locators.h"
65 
66 #if NIOAPIC > 0 || NACPICA > 0
67 #include <machine/mpacpi.h>
68 #endif
69 
70 #if NPCI > 0
71 #include <dev/pci/ppbreg.h>
72 #endif
73 
74 #if NIOAPIC > 0 || NACPICA > 0
75 static int intr_scan_bus(int, int, intr_handle_t *);
76 #if NPCI > 0
77 static int intr_find_pcibridge(int, pcitag_t *, pci_chipset_tag_t *);
78 #endif
79 #endif
80 
81 #if NPCI > 0
82 int
mp_pci_scan(device_t self,struct pcibus_attach_args * pba,cfprint_t print)83 mp_pci_scan(device_t self, struct pcibus_attach_args *pba,
84     cfprint_t print)
85 {
86 	int i, cnt;
87 	struct mp_bus *mpb;
88 
89 	cnt = 0;
90 	for (i = 0; i < mp_nbus; i++) {
91 		mpb = &mp_busses[i];
92 		if (mpb->mb_name == NULL)
93 			continue;
94 		if (strcmp(mpb->mb_name, "pci") == 0 && mpb->mb_dev == NULL) {
95 			pba->pba_bus = i;
96 			mpb->mb_dev = config_found(self, pba, print,
97 			    CFARGS(.iattr = "pcibus"));
98 			cnt++;
99 		}
100 	}
101 	return cnt;
102 }
103 
104 void
mp_pci_childdetached(device_t self,device_t child)105 mp_pci_childdetached(device_t self, device_t child)
106 {
107 	int i;
108 	struct mp_bus *mpb;
109 
110 	for (i = 0; i < mp_nbus; i++) {
111 		mpb = &mp_busses[i];
112 		if (mpb->mb_name == NULL)
113 			continue;
114 		if (strcmp(mpb->mb_name, "pci") == 0 && mpb->mb_dev == child)
115 			mpb->mb_dev = NULL;
116 	}
117 }
118 #endif
119 
120 /*
121  * List to keep track of PCI buses that are probed but not known
122  * to the firmware. Used to
123  *
124  * XXX should maintain one list, not an array and a linked list.
125  */
126 #if (NPCI > 0) && ((NIOAPIC > 0) || NACPICA > 0)
127 struct intr_extra_bus {
128 	int bus;
129 	pcitag_t *pci_bridge_tag;
130 	pci_chipset_tag_t pci_chipset_tag;
131 	LIST_ENTRY(intr_extra_bus) list;
132 };
133 
134 LIST_HEAD(, intr_extra_bus) intr_extra_buses =
135     LIST_HEAD_INITIALIZER(intr_extra_buses);
136 
137 
138 void
intr_add_pcibus(struct pcibus_attach_args * pba)139 intr_add_pcibus(struct pcibus_attach_args *pba)
140 {
141 	struct intr_extra_bus *iebp;
142 
143 	iebp = kmem_alloc(sizeof(*iebp), KM_SLEEP);
144 	iebp->bus = pba->pba_bus;
145 	iebp->pci_chipset_tag = pba->pba_pc;
146 	iebp->pci_bridge_tag = pba->pba_bridgetag;
147 	LIST_INSERT_HEAD(&intr_extra_buses, iebp, list);
148 }
149 
150 static int
intr_find_pcibridge(int bus,pcitag_t * pci_bridge_tag,pci_chipset_tag_t * pc)151 intr_find_pcibridge(int bus, pcitag_t *pci_bridge_tag,
152 		    pci_chipset_tag_t *pc)
153 {
154 	struct intr_extra_bus *iebp;
155 	struct mp_bus *mpb;
156 
157 	if (bus < 0)
158 		return ENOENT;
159 
160 	if (bus < mp_nbus) {
161 		mpb = &mp_busses[bus];
162 		if (mpb->mb_pci_bridge_tag == NULL)
163 			return ENOENT;
164 		*pci_bridge_tag = *mpb->mb_pci_bridge_tag;
165 		*pc = mpb->mb_pci_chipset_tag;
166 		return 0;
167 	}
168 
169 	LIST_FOREACH(iebp, &intr_extra_buses, list) {
170 		if (iebp->bus == bus) {
171 			if (iebp->pci_bridge_tag == NULL)
172 				return ENOENT;
173 			*pci_bridge_tag = *iebp->pci_bridge_tag;
174 			*pc = iebp->pci_chipset_tag;
175 			return 0;
176 		}
177 	}
178 	return ENOENT;
179 }
180 #endif
181 
182 #if NIOAPIC > 0 || NACPICA > 0
183 /*
184  * 'pin' argument pci bus_pin encoding of a device/pin combination.
185  */
186 int
intr_find_mpmapping(int bus,int pin,intr_handle_t * handle)187 intr_find_mpmapping(int bus, int pin, intr_handle_t *handle)
188 {
189 
190 #if NPCI > 0
191 	while (intr_scan_bus(bus, pin, handle) != 0) {
192 		int dev, func;
193 		pcitag_t pci_bridge_tag;
194 		pci_chipset_tag_t pc;
195 
196 		if (intr_find_pcibridge(bus, &pci_bridge_tag, &pc) != 0)
197 			return ENOENT;
198 		dev = pin >> 2;
199 		pin = pin & 3;
200 		pin = PPB_INTERRUPT_SWIZZLE(pin + 1, dev) - 1;
201 		pci_decompose_tag(pc, pci_bridge_tag, &bus, &dev, &func);
202 		pin |= (dev << 2);
203 	}
204 	return 0;
205 #else
206 	return intr_scan_bus(bus, pin, handle);
207 #endif
208 }
209 
210 static int
intr_scan_bus(int bus,int pin,intr_handle_t * handle)211 intr_scan_bus(int bus, int pin, intr_handle_t *handle)
212 {
213 	struct mp_intr_map *mip, *intrs;
214 
215 	if (bus < 0 || bus >= mp_nbus)
216 		return ENOENT;
217 
218 	intrs = mp_busses[bus].mb_intrs;
219 	if (intrs == NULL)
220 		return ENOENT;
221 
222 	for (mip = intrs; mip != NULL; mip = mip->next) {
223 		if (mip->bus_pin == pin) {
224 #if NACPICA > 0
225 			if (mip->linkdev != NULL)
226 				if (mpacpi_findintr_linkdev(mip) != 0)
227 					continue;
228 #endif
229 			*handle = mip->ioapic_ih;
230 			return 0;
231 		}
232 	}
233 	return ENOENT;
234 }
235 #endif
236