1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2001 Jake Burkholder.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/12/sys/sparc64/sparc64/tlb.c 326262 2017-11-27 15:10:39Z pfg $");
31
32 #include "opt_pmap.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/ktr.h>
37 #include <sys/pcpu.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/smp.h>
41 #include <sys/sysctl.h>
42
43 #include <vm/vm.h>
44 #include <vm/pmap.h>
45
46 #include <machine/smp.h>
47 #include <machine/tlb.h>
48 #include <machine/vmparam.h>
49
50 PMAP_STATS_VAR(tlb_ncontext_demap);
51 PMAP_STATS_VAR(tlb_npage_demap);
52 PMAP_STATS_VAR(tlb_nrange_demap);
53
54 tlb_flush_nonlocked_t *tlb_flush_nonlocked;
55 tlb_flush_user_t *tlb_flush_user;
56
57 /*
58 * Some tlb operations must be atomic, so no interrupt or trap can be allowed
59 * while they are in progress. Traps should not happen, but interrupts need to
60 * be explicitely disabled. critical_enter() cannot be used here, since it only
61 * disables soft interrupts.
62 */
63
64 void
tlb_context_demap(struct pmap * pm)65 tlb_context_demap(struct pmap *pm)
66 {
67 void *cookie;
68 register_t s;
69
70 /*
71 * It is important that we are not interrupted or preempted while
72 * doing the IPIs. The interrupted CPU may hold locks, and since
73 * it will wait for the CPU that sent the IPI, this can lead
74 * to a deadlock when an interrupt comes in on that CPU and it's
75 * handler tries to grab one of that locks. This will only happen for
76 * spin locks, but these IPI types are delivered even if normal
77 * interrupts are disabled, so the lock critical section will not
78 * protect the target processor from entering the IPI handler with
79 * the lock held.
80 */
81 PMAP_STATS_INC(tlb_ncontext_demap);
82 cookie = ipi_tlb_context_demap(pm);
83 s = intr_disable();
84 if (CPU_ISSET(PCPU_GET(cpuid), &pm->pm_active)) {
85 KASSERT(pm->pm_context[curcpu] != -1,
86 ("tlb_context_demap: inactive pmap?"));
87 stxa(TLB_DEMAP_PRIMARY | TLB_DEMAP_CONTEXT, ASI_DMMU_DEMAP, 0);
88 stxa(TLB_DEMAP_PRIMARY | TLB_DEMAP_CONTEXT, ASI_IMMU_DEMAP, 0);
89 flush(KERNBASE);
90 }
91 intr_restore(s);
92 ipi_wait(cookie);
93 }
94
95 void
tlb_page_demap(struct pmap * pm,vm_offset_t va)96 tlb_page_demap(struct pmap *pm, vm_offset_t va)
97 {
98 u_long flags;
99 void *cookie;
100 register_t s;
101
102 PMAP_STATS_INC(tlb_npage_demap);
103 cookie = ipi_tlb_page_demap(pm, va);
104 s = intr_disable();
105 if (CPU_ISSET(PCPU_GET(cpuid), &pm->pm_active)) {
106 KASSERT(pm->pm_context[curcpu] != -1,
107 ("tlb_page_demap: inactive pmap?"));
108 if (pm == kernel_pmap)
109 flags = TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE;
110 else
111 flags = TLB_DEMAP_PRIMARY | TLB_DEMAP_PAGE;
112
113 stxa(TLB_DEMAP_VA(va) | flags, ASI_DMMU_DEMAP, 0);
114 stxa(TLB_DEMAP_VA(va) | flags, ASI_IMMU_DEMAP, 0);
115 flush(KERNBASE);
116 }
117 intr_restore(s);
118 ipi_wait(cookie);
119 }
120
121 void
tlb_range_demap(struct pmap * pm,vm_offset_t start,vm_offset_t end)122 tlb_range_demap(struct pmap *pm, vm_offset_t start, vm_offset_t end)
123 {
124 vm_offset_t va;
125 void *cookie;
126 u_long flags;
127 register_t s;
128
129 PMAP_STATS_INC(tlb_nrange_demap);
130 cookie = ipi_tlb_range_demap(pm, start, end);
131 s = intr_disable();
132 if (CPU_ISSET(PCPU_GET(cpuid), &pm->pm_active)) {
133 KASSERT(pm->pm_context[curcpu] != -1,
134 ("tlb_range_demap: inactive pmap?"));
135 if (pm == kernel_pmap)
136 flags = TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE;
137 else
138 flags = TLB_DEMAP_PRIMARY | TLB_DEMAP_PAGE;
139
140 for (va = start; va < end; va += PAGE_SIZE) {
141 stxa(TLB_DEMAP_VA(va) | flags, ASI_DMMU_DEMAP, 0);
142 stxa(TLB_DEMAP_VA(va) | flags, ASI_IMMU_DEMAP, 0);
143 flush(KERNBASE);
144 }
145 }
146 intr_restore(s);
147 ipi_wait(cookie);
148 }
149