| 1 | /* $NetBSD: ipi.c,v 1.26 2014/07/20 15:48:54 uebayasi Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2000, 2008, 2009 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by RedBack Networks Inc. |
| 9 | * |
| 10 | * Author: Bill Sommerfeld |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * 1. Redistributions of source code must retain the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer. |
| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer in the |
| 19 | * documentation and/or other materials provided with the distribution. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 23 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 25 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 31 | * POSSIBILITY OF SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #include <sys/cdefs.h> |
| 35 | __KERNEL_RCSID(0, "$NetBSD: ipi.c,v 1.26 2014/07/20 15:48:54 uebayasi Exp $" ); |
| 36 | |
| 37 | #include "opt_mtrr.h" |
| 38 | |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/device.h> |
| 41 | #include <sys/systm.h> |
| 42 | #include <sys/atomic.h> |
| 43 | #include <sys/intr.h> |
| 44 | #include <sys/ipi.h> |
| 45 | #include <sys/cpu.h> |
| 46 | #include <sys/xcall.h> |
| 47 | |
| 48 | #ifdef MULTIPROCESSOR |
| 49 | |
| 50 | #include <machine/cpufunc.h> |
| 51 | #include <machine/cpuvar.h> |
| 52 | #include <machine/i82093var.h> |
| 53 | #include <machine/i82489reg.h> |
| 54 | #include <machine/i82489var.h> |
| 55 | #include <machine/mtrr.h> |
| 56 | #include <machine/gdt.h> |
| 57 | |
| 58 | #include "acpica.h" |
| 59 | |
| 60 | #include <x86/fpu.h> |
| 61 | |
| 62 | static void x86_ipi_halt(struct cpu_info *); |
| 63 | static void x86_ipi_kpreempt(struct cpu_info *); |
| 64 | static void x86_ipi_xcall(struct cpu_info *); |
| 65 | static void x86_ipi_generic(struct cpu_info *); |
| 66 | |
| 67 | #ifdef MTRR |
| 68 | static void x86_ipi_reload_mtrr(struct cpu_info *); |
| 69 | #else |
| 70 | #define x86_ipi_reload_mtrr NULL |
| 71 | #endif |
| 72 | |
| 73 | #if NACPICA > 0 |
| 74 | void acpi_cpu_sleep(struct cpu_info *); |
| 75 | #else |
| 76 | #define acpi_cpu_sleep NULL |
| 77 | #endif |
| 78 | |
| 79 | static void x86_ipi_synch_fpu(struct cpu_info *); |
| 80 | |
| 81 | void (* const ipifunc[X86_NIPI])(struct cpu_info *) = |
| 82 | { |
| 83 | x86_ipi_halt, /* X86_IPI_HALT */ |
| 84 | NULL, /* X86_IPI_MICROSET */ |
| 85 | x86_ipi_generic, /* X86_IPI_GENERIC */ |
| 86 | x86_ipi_synch_fpu, /* X86_IPI_SYNCH_FPU */ |
| 87 | x86_ipi_reload_mtrr, /* X86_IPI_MTRR */ |
| 88 | gdt_reload_cpu, /* X86_IPI_GDT */ |
| 89 | x86_ipi_xcall, /* X86_IPI_XCALL */ |
| 90 | acpi_cpu_sleep, /* X86_IPI_ACPI_CPU_SLEEP */ |
| 91 | x86_ipi_kpreempt /* X86_IPI_KPREEMPT */ |
| 92 | }; |
| 93 | |
| 94 | /* |
| 95 | * x86 IPI interface. |
| 96 | */ |
| 97 | |
| 98 | int |
| 99 | x86_send_ipi(struct cpu_info *ci, int ipimask) |
| 100 | { |
| 101 | int ret; |
| 102 | |
| 103 | atomic_or_32(&ci->ci_ipis, ipimask); |
| 104 | |
| 105 | /* Don't send IPI to CPU which isn't (yet) running. */ |
| 106 | if (!(ci->ci_flags & CPUF_RUNNING)) |
| 107 | return ENOENT; |
| 108 | |
| 109 | ret = x86_ipi(LAPIC_IPI_VECTOR, ci->ci_cpuid, LAPIC_DLMODE_FIXED); |
| 110 | if (ret != 0) { |
| 111 | printf("ipi of %x from %s to %s failed\n" , |
| 112 | ipimask, |
| 113 | device_xname(curcpu()->ci_dev), |
| 114 | device_xname(ci->ci_dev)); |
| 115 | } |
| 116 | |
| 117 | return ret; |
| 118 | } |
| 119 | |
| 120 | void |
| 121 | x86_broadcast_ipi(int ipimask) |
| 122 | { |
| 123 | struct cpu_info *ci, *self = curcpu(); |
| 124 | int count = 0; |
| 125 | CPU_INFO_ITERATOR cii; |
| 126 | |
| 127 | for (CPU_INFO_FOREACH(cii, ci)) { |
| 128 | if (ci == self) |
| 129 | continue; |
| 130 | if ((ci->ci_flags & CPUF_RUNNING) == 0) |
| 131 | continue; |
| 132 | atomic_or_32(&ci->ci_ipis, ipimask); |
| 133 | count++; |
| 134 | } |
| 135 | if (!count) |
| 136 | return; |
| 137 | |
| 138 | x86_ipi(LAPIC_IPI_VECTOR, LAPIC_DEST_ALLEXCL, LAPIC_DLMODE_FIXED); |
| 139 | } |
| 140 | |
| 141 | void |
| 142 | x86_ipi_handler(void) |
| 143 | { |
| 144 | struct cpu_info *ci = curcpu(); |
| 145 | uint32_t pending; |
| 146 | int bit; |
| 147 | |
| 148 | pending = atomic_swap_32(&ci->ci_ipis, 0); |
| 149 | |
| 150 | KDASSERT((pending >> X86_NIPI) == 0); |
| 151 | while ((bit = ffs(pending)) != 0) { |
| 152 | bit--; |
| 153 | pending &= ~(1 << bit); |
| 154 | ci->ci_ipi_events[bit].ev_count++; |
| 155 | (*ipifunc[bit])(ci); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Common x86 IPI handlers. |
| 161 | */ |
| 162 | |
| 163 | static void |
| 164 | x86_ipi_halt(struct cpu_info *ci) |
| 165 | { |
| 166 | |
| 167 | x86_disable_intr(); |
| 168 | atomic_and_32(&ci->ci_flags, ~CPUF_RUNNING); |
| 169 | |
| 170 | for (;;) { |
| 171 | x86_hlt(); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | static void |
| 176 | x86_ipi_synch_fpu(struct cpu_info *ci) |
| 177 | { |
| 178 | |
| 179 | fpusave_cpu(true); |
| 180 | } |
| 181 | |
| 182 | #ifdef MTRR |
| 183 | static void |
| 184 | x86_ipi_reload_mtrr(struct cpu_info *ci) |
| 185 | { |
| 186 | |
| 187 | if (mtrr_funcs != NULL) { |
| 188 | /* |
| 189 | * mtrr_reload_cpu() is a macro in mtrr.h which picks |
| 190 | * the appropriate function to use. |
| 191 | */ |
| 192 | mtrr_reload_cpu(ci); |
| 193 | } |
| 194 | } |
| 195 | #endif |
| 196 | |
| 197 | static void |
| 198 | x86_ipi_kpreempt(struct cpu_info *ci) |
| 199 | { |
| 200 | |
| 201 | softint_trigger(1 << SIR_PREEMPT); |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * MD support for xcall(9) interface. |
| 206 | */ |
| 207 | |
| 208 | static void |
| 209 | x86_ipi_xcall(struct cpu_info *ci) |
| 210 | { |
| 211 | xc_ipi_handler(); |
| 212 | } |
| 213 | |
| 214 | static void |
| 215 | x86_ipi_generic(struct cpu_info *ci) |
| 216 | { |
| 217 | ipi_cpu_handler(); |
| 218 | } |
| 219 | |
| 220 | void |
| 221 | xc_send_ipi(struct cpu_info *ci) |
| 222 | { |
| 223 | |
| 224 | KASSERT(kpreempt_disabled()); |
| 225 | KASSERT(curcpu() != ci); |
| 226 | |
| 227 | if (ci) { |
| 228 | /* Unicast: remote CPU. */ |
| 229 | x86_send_ipi(ci, X86_IPI_XCALL); |
| 230 | } else { |
| 231 | /* Broadcast: all, but local CPU (caller will handle it). */ |
| 232 | x86_broadcast_ipi(X86_IPI_XCALL); |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | void |
| 237 | cpu_ipi(struct cpu_info *ci) |
| 238 | { |
| 239 | KASSERT(kpreempt_disabled()); |
| 240 | KASSERT(curcpu() != ci); |
| 241 | |
| 242 | if (ci) { |
| 243 | /* Unicast: remote CPU. */ |
| 244 | x86_send_ipi(ci, X86_IPI_GENERIC); |
| 245 | } else { |
| 246 | /* Broadcast: all, but local CPU (caller will handle it). */ |
| 247 | x86_broadcast_ipi(X86_IPI_GENERIC); |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | #else |
| 252 | |
| 253 | int |
| 254 | x86_send_ipi(struct cpu_info *ci, int ipimask) |
| 255 | { |
| 256 | |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | void |
| 261 | x86_broadcast_ipi(int ipimask) |
| 262 | { |
| 263 | |
| 264 | } |
| 265 | |
| 266 | void |
| 267 | cpu_ipi(struct cpu_info *ci) |
| 268 | { |
| 269 | } |
| 270 | |
| 271 | #endif |
| 272 | |