1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 The FreeBSD Foundation 5 * 6 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 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, 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 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include "opt_acpi.h" 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/memdesc.h> 39 #include <sys/module.h> 40 #include <sys/rman.h> 41 #include <sys/taskqueue.h> 42 #include <sys/tree.h> 43 #include <sys/vmem.h> 44 #include <machine/bus.h> 45 #include <contrib/dev/acpica/include/acpi.h> 46 #include <contrib/dev/acpica/include/accommon.h> 47 #include <dev/acpica/acpivar.h> 48 #include <dev/pci/pcireg.h> 49 #include <dev/pci/pcivar.h> 50 #include <vm/vm.h> 51 #include <vm/vm_extern.h> 52 #include <vm/vm_kern.h> 53 #include <vm/vm_page.h> 54 #include <vm/vm_map.h> 55 #include <x86/include/busdma_impl.h> 56 #include <x86/iommu/intel_reg.h> 57 #include <dev/iommu/busdma_iommu.h> 58 #include <x86/iommu/intel_dmar.h> 59 60 /* 61 * Fault interrupt handling for DMARs. If advanced fault logging is 62 * not implemented by hardware, the code emulates it. Fast interrupt 63 * handler flushes the fault registers into circular buffer at 64 * unit->fault_log, and schedules a task. 65 * 66 * The fast handler is used since faults usually come in bursts, and 67 * number of fault log registers is limited, e.g. down to one for 5400 68 * MCH. We are trying to reduce the latency for clearing the fault 69 * register file. The task is usually long-running, since printf() is 70 * slow, but this is not problematic because bursts are rare. 71 * 72 * For the same reason, each translation unit task is executed in its 73 * own thread. 74 * 75 * XXXKIB It seems there is no hardware available which implements 76 * advanced fault logging, so the code to handle AFL is not written. 77 */ 78 79 static int 80 dmar_fault_next(struct dmar_unit *unit, int faultp) 81 { 82 83 faultp += 2; 84 if (faultp == unit->fault_log_size) 85 faultp = 0; 86 return (faultp); 87 } 88 89 static void 90 dmar_fault_intr_clear(struct dmar_unit *unit, uint32_t fsts) 91 { 92 uint32_t clear; 93 94 clear = 0; 95 if ((fsts & DMAR_FSTS_ITE) != 0) { 96 printf("DMAR%d: Invalidation timed out\n", unit->iommu.unit); 97 clear |= DMAR_FSTS_ITE; 98 } 99 if ((fsts & DMAR_FSTS_ICE) != 0) { 100 printf("DMAR%d: Invalidation completion error\n", 101 unit->iommu.unit); 102 clear |= DMAR_FSTS_ICE; 103 } 104 if ((fsts & DMAR_FSTS_IQE) != 0) { 105 printf("DMAR%d: Invalidation queue error\n", 106 unit->iommu.unit); 107 clear |= DMAR_FSTS_IQE; 108 } 109 if ((fsts & DMAR_FSTS_APF) != 0) { 110 printf("DMAR%d: Advanced pending fault\n", unit->iommu.unit); 111 clear |= DMAR_FSTS_APF; 112 } 113 if ((fsts & DMAR_FSTS_AFO) != 0) { 114 printf("DMAR%d: Advanced fault overflow\n", unit->iommu.unit); 115 clear |= DMAR_FSTS_AFO; 116 } 117 if (clear != 0) 118 dmar_write4(unit, DMAR_FSTS_REG, clear); 119 } 120 121 int 122 dmar_fault_intr(void *arg) 123 { 124 struct dmar_unit *unit; 125 uint64_t fault_rec[2]; 126 uint32_t fsts; 127 int fri, frir, faultp; 128 bool enqueue; 129 130 unit = arg; 131 enqueue = false; 132 fsts = dmar_read4(unit, DMAR_FSTS_REG); 133 dmar_fault_intr_clear(unit, fsts); 134 135 if ((fsts & DMAR_FSTS_PPF) == 0) 136 goto done; 137 138 fri = DMAR_FSTS_FRI(fsts); 139 for (;;) { 140 frir = (DMAR_CAP_FRO(unit->hw_cap) + fri) * 16; 141 fault_rec[1] = dmar_read8(unit, frir + 8); 142 if ((fault_rec[1] & DMAR_FRCD2_F) == 0) 143 break; 144 fault_rec[0] = dmar_read8(unit, frir); 145 dmar_write4(unit, frir + 12, DMAR_FRCD2_F32); 146 DMAR_FAULT_LOCK(unit); 147 faultp = unit->fault_log_head; 148 if (dmar_fault_next(unit, faultp) == unit->fault_log_tail) { 149 /* XXXKIB log overflow */ 150 } else { 151 unit->fault_log[faultp] = fault_rec[0]; 152 unit->fault_log[faultp + 1] = fault_rec[1]; 153 unit->fault_log_head = dmar_fault_next(unit, faultp); 154 enqueue = true; 155 } 156 DMAR_FAULT_UNLOCK(unit); 157 fri += 1; 158 if (fri >= DMAR_CAP_NFR(unit->hw_cap)) 159 fri = 0; 160 } 161 162 done: 163 /* 164 * On SandyBridge, due to errata BJ124, IvyBridge errata 165 * BV100, and Haswell errata HSD40, "Spurious Intel VT-d 166 * Interrupts May Occur When the PFO Bit is Set". Handle the 167 * cases by clearing overflow bit even if no fault is 168 * reported. 169 * 170 * On IvyBridge, errata BV30 states that clearing clear 171 * DMAR_FRCD2_F bit in the fault register causes spurious 172 * interrupt. Do nothing. 173 * 174 */ 175 if ((fsts & DMAR_FSTS_PFO) != 0) { 176 printf("DMAR%d: Fault Overflow\n", unit->iommu.unit); 177 dmar_write4(unit, DMAR_FSTS_REG, DMAR_FSTS_PFO); 178 } 179 180 if (enqueue) { 181 taskqueue_enqueue(unit->fault_taskqueue, 182 &unit->fault_task); 183 } 184 return (FILTER_HANDLED); 185 } 186 187 static void 188 dmar_fault_task(void *arg, int pending __unused) 189 { 190 struct dmar_unit *unit; 191 struct dmar_ctx *ctx; 192 uint64_t fault_rec[2]; 193 int sid, bus, slot, func, faultp; 194 195 unit = arg; 196 DMAR_FAULT_LOCK(unit); 197 for (;;) { 198 faultp = unit->fault_log_tail; 199 if (faultp == unit->fault_log_head) 200 break; 201 202 fault_rec[0] = unit->fault_log[faultp]; 203 fault_rec[1] = unit->fault_log[faultp + 1]; 204 unit->fault_log_tail = dmar_fault_next(unit, faultp); 205 DMAR_FAULT_UNLOCK(unit); 206 207 sid = DMAR_FRCD2_SID(fault_rec[1]); 208 printf("DMAR%d: ", unit->iommu.unit); 209 DMAR_LOCK(unit); 210 ctx = dmar_find_ctx_locked(unit, sid); 211 if (ctx == NULL) { 212 printf("<unknown dev>:"); 213 214 /* 215 * Note that the slot and function will not be correct 216 * if ARI is in use, but without a ctx entry we have 217 * no way of knowing whether ARI is in use or not. 218 */ 219 bus = PCI_RID2BUS(sid); 220 slot = PCI_RID2SLOT(sid); 221 func = PCI_RID2FUNC(sid); 222 } else { 223 ctx->context.flags |= IOMMU_CTX_FAULTED; 224 ctx->last_fault_rec[0] = fault_rec[0]; 225 ctx->last_fault_rec[1] = fault_rec[1]; 226 device_print_prettyname(ctx->context.tag->owner); 227 bus = pci_get_bus(ctx->context.tag->owner); 228 slot = pci_get_slot(ctx->context.tag->owner); 229 func = pci_get_function(ctx->context.tag->owner); 230 } 231 DMAR_UNLOCK(unit); 232 printf( 233 "pci%d:%d:%d sid %x fault acc %x adt 0x%x reason 0x%x " 234 "addr %jx\n", 235 bus, slot, func, sid, DMAR_FRCD2_T(fault_rec[1]), 236 DMAR_FRCD2_AT(fault_rec[1]), DMAR_FRCD2_FR(fault_rec[1]), 237 (uintmax_t)fault_rec[0]); 238 DMAR_FAULT_LOCK(unit); 239 } 240 DMAR_FAULT_UNLOCK(unit); 241 } 242 243 static void 244 dmar_clear_faults(struct dmar_unit *unit) 245 { 246 uint32_t frec, frir, fsts; 247 int i; 248 249 for (i = 0; i < DMAR_CAP_NFR(unit->hw_cap); i++) { 250 frir = (DMAR_CAP_FRO(unit->hw_cap) + i) * 16; 251 frec = dmar_read4(unit, frir + 12); 252 if ((frec & DMAR_FRCD2_F32) == 0) 253 continue; 254 dmar_write4(unit, frir + 12, DMAR_FRCD2_F32); 255 } 256 fsts = dmar_read4(unit, DMAR_FSTS_REG); 257 dmar_write4(unit, DMAR_FSTS_REG, fsts); 258 } 259 260 int 261 dmar_init_fault_log(struct dmar_unit *unit) 262 { 263 264 mtx_init(&unit->fault_lock, "dmarflt", NULL, MTX_SPIN); 265 unit->fault_log_size = 256; /* 128 fault log entries */ 266 TUNABLE_INT_FETCH("hw.dmar.fault_log_size", &unit->fault_log_size); 267 if (unit->fault_log_size % 2 != 0) 268 panic("hw.dmar_fault_log_size must be even"); 269 unit->fault_log = malloc(sizeof(uint64_t) * unit->fault_log_size, 270 M_DEVBUF, M_WAITOK | M_ZERO); 271 272 TASK_INIT(&unit->fault_task, 0, dmar_fault_task, unit); 273 unit->fault_taskqueue = taskqueue_create_fast("dmarff", M_WAITOK, 274 taskqueue_thread_enqueue, &unit->fault_taskqueue); 275 taskqueue_start_threads(&unit->fault_taskqueue, 1, PI_AV, 276 "dmar%d fault taskq", unit->iommu.unit); 277 278 DMAR_LOCK(unit); 279 dmar_disable_fault_intr(unit); 280 dmar_clear_faults(unit); 281 dmar_enable_fault_intr(unit); 282 DMAR_UNLOCK(unit); 283 284 return (0); 285 } 286 287 void 288 dmar_fini_fault_log(struct dmar_unit *unit) 289 { 290 291 if (unit->fault_taskqueue == NULL) 292 return; 293 294 DMAR_LOCK(unit); 295 dmar_disable_fault_intr(unit); 296 DMAR_UNLOCK(unit); 297 298 taskqueue_drain(unit->fault_taskqueue, &unit->fault_task); 299 taskqueue_free(unit->fault_taskqueue); 300 unit->fault_taskqueue = NULL; 301 mtx_destroy(&unit->fault_lock); 302 303 free(unit->fault_log, M_DEVBUF); 304 unit->fault_log = NULL; 305 unit->fault_log_head = unit->fault_log_tail = 0; 306 } 307 308 void 309 dmar_enable_fault_intr(struct dmar_unit *unit) 310 { 311 uint32_t fectl; 312 313 DMAR_ASSERT_LOCKED(unit); 314 fectl = dmar_read4(unit, DMAR_FECTL_REG); 315 fectl &= ~DMAR_FECTL_IM; 316 dmar_write4(unit, DMAR_FECTL_REG, fectl); 317 } 318 319 void 320 dmar_disable_fault_intr(struct dmar_unit *unit) 321 { 322 uint32_t fectl; 323 324 DMAR_ASSERT_LOCKED(unit); 325 fectl = dmar_read4(unit, DMAR_FECTL_REG); 326 dmar_write4(unit, DMAR_FECTL_REG, fectl | DMAR_FECTL_IM); 327 } 328