Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Michael Ellerman, IBM Corporation. |
| 3 | * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2, as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/kvm_host.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/gfp.h> |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 14 | #include <linux/anon_inodes.h> |
Michael Ellerman | 433c5c2 | 2015-04-28 10:34:35 +1000 | [diff] [blame] | 15 | #include <linux/spinlock.h> |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 16 | |
| 17 | #include <asm/uaccess.h> |
| 18 | #include <asm/kvm_book3s.h> |
| 19 | #include <asm/kvm_ppc.h> |
| 20 | #include <asm/hvcall.h> |
| 21 | #include <asm/xics.h> |
| 22 | #include <asm/debug.h> |
Paul Mackerras | 7bfa9ad | 2013-08-06 14:13:44 +1000 | [diff] [blame] | 23 | #include <asm/time.h> |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 24 | |
| 25 | #include <linux/debugfs.h> |
| 26 | #include <linux/seq_file.h> |
| 27 | |
| 28 | #include "book3s_xics.h" |
| 29 | |
| 30 | #if 1 |
| 31 | #define XICS_DBG(fmt...) do { } while (0) |
| 32 | #else |
| 33 | #define XICS_DBG(fmt...) trace_printk(fmt) |
| 34 | #endif |
| 35 | |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 36 | #define ENABLE_REALMODE true |
| 37 | #define DEBUG_REALMODE false |
| 38 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 39 | /* |
| 40 | * LOCKING |
| 41 | * ======= |
| 42 | * |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 43 | * Each ICS has a spin lock protecting the information about the IRQ |
Greg Kurz | 4e33d1f | 2015-09-03 11:12:59 +0200 | [diff] [blame] | 44 | * sources and avoiding simultaneous deliveries of the same interrupt. |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 45 | * |
| 46 | * ICP operations are done via a single compare & swap transaction |
| 47 | * (most ICP state fits in the union kvmppc_icp_state) |
| 48 | */ |
| 49 | |
| 50 | /* |
| 51 | * TODO |
| 52 | * ==== |
| 53 | * |
| 54 | * - To speed up resends, keep a bitmap of "resend" set bits in the |
| 55 | * ICS |
| 56 | * |
| 57 | * - Speed up server# -> ICP lookup (array ? hash table ?) |
| 58 | * |
| 59 | * - Make ICS lockless as well, or at least a per-interrupt lock or hashed |
| 60 | * locks array to improve scalability |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 61 | */ |
| 62 | |
| 63 | /* -- ICS routines -- */ |
| 64 | |
| 65 | static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp, |
| 66 | u32 new_irq); |
| 67 | |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 68 | /* |
| 69 | * Return value ideally indicates how the interrupt was handled, but no |
| 70 | * callers look at it (given that we don't implement KVM_IRQ_LINE_STATUS), |
| 71 | * so just return 0. |
| 72 | */ |
| 73 | static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 74 | { |
| 75 | struct ics_irq_state *state; |
| 76 | struct kvmppc_ics *ics; |
| 77 | u16 src; |
| 78 | |
| 79 | XICS_DBG("ics deliver %#x (level: %d)\n", irq, level); |
| 80 | |
| 81 | ics = kvmppc_xics_find_ics(xics, irq, &src); |
| 82 | if (!ics) { |
| 83 | XICS_DBG("ics_deliver_irq: IRQ 0x%06x not found !\n", irq); |
| 84 | return -EINVAL; |
| 85 | } |
| 86 | state = &ics->irq_state[src]; |
| 87 | if (!state->exists) |
| 88 | return -EINVAL; |
| 89 | |
| 90 | /* |
| 91 | * We set state->asserted locklessly. This should be fine as |
| 92 | * we are the only setter, thus concurrent access is undefined |
| 93 | * to begin with. |
| 94 | */ |
Paul Mackerras | b1a4286 | 2016-05-04 21:07:52 +1000 | [diff] [blame] | 95 | if ((level == 1 && state->lsi) || level == KVM_INTERRUPT_SET_LEVEL) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 96 | state->asserted = 1; |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 97 | else if (level == 0 || level == KVM_INTERRUPT_UNSET) { |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 98 | state->asserted = 0; |
| 99 | return 0; |
| 100 | } |
| 101 | |
Paul Mackerras | 5d37519 | 2016-08-19 15:35:56 +1000 | [diff] [blame] | 102 | /* Record which CPU this arrived on for passed-through interrupts */ |
| 103 | if (state->host_irq) |
| 104 | state->intr_cpu = raw_smp_processor_id(); |
| 105 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 106 | /* Attempt delivery */ |
| 107 | icp_deliver_irq(xics, NULL, irq); |
| 108 | |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 109 | return 0; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics, |
| 113 | struct kvmppc_icp *icp) |
| 114 | { |
| 115 | int i; |
| 116 | |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 117 | unsigned long flags; |
| 118 | |
| 119 | local_irq_save(flags); |
| 120 | arch_spin_lock(&ics->lock); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 121 | |
| 122 | for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) { |
| 123 | struct ics_irq_state *state = &ics->irq_state[i]; |
| 124 | |
| 125 | if (!state->resend) |
| 126 | continue; |
| 127 | |
| 128 | XICS_DBG("resend %#x prio %#x\n", state->number, |
| 129 | state->priority); |
| 130 | |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 131 | arch_spin_unlock(&ics->lock); |
| 132 | local_irq_restore(flags); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 133 | icp_deliver_irq(xics, icp, state->number); |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 134 | local_irq_save(flags); |
| 135 | arch_spin_lock(&ics->lock); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 136 | } |
| 137 | |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 138 | arch_spin_unlock(&ics->lock); |
| 139 | local_irq_restore(flags); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 140 | } |
| 141 | |
Paul Mackerras | d19bd862 | 2013-04-17 20:32:04 +0000 | [diff] [blame] | 142 | static bool write_xive(struct kvmppc_xics *xics, struct kvmppc_ics *ics, |
| 143 | struct ics_irq_state *state, |
| 144 | u32 server, u32 priority, u32 saved_priority) |
| 145 | { |
| 146 | bool deliver; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 147 | unsigned long flags; |
Paul Mackerras | d19bd862 | 2013-04-17 20:32:04 +0000 | [diff] [blame] | 148 | |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 149 | local_irq_save(flags); |
| 150 | arch_spin_lock(&ics->lock); |
Paul Mackerras | d19bd862 | 2013-04-17 20:32:04 +0000 | [diff] [blame] | 151 | |
| 152 | state->server = server; |
| 153 | state->priority = priority; |
| 154 | state->saved_priority = saved_priority; |
| 155 | deliver = false; |
| 156 | if ((state->masked_pending || state->resend) && priority != MASKED) { |
| 157 | state->masked_pending = 0; |
| 158 | deliver = true; |
| 159 | } |
| 160 | |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 161 | arch_spin_unlock(&ics->lock); |
| 162 | local_irq_restore(flags); |
Paul Mackerras | d19bd862 | 2013-04-17 20:32:04 +0000 | [diff] [blame] | 163 | |
| 164 | return deliver; |
| 165 | } |
| 166 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 167 | int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority) |
| 168 | { |
| 169 | struct kvmppc_xics *xics = kvm->arch.xics; |
| 170 | struct kvmppc_icp *icp; |
| 171 | struct kvmppc_ics *ics; |
| 172 | struct ics_irq_state *state; |
| 173 | u16 src; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 174 | |
| 175 | if (!xics) |
| 176 | return -ENODEV; |
| 177 | |
| 178 | ics = kvmppc_xics_find_ics(xics, irq, &src); |
| 179 | if (!ics) |
| 180 | return -EINVAL; |
| 181 | state = &ics->irq_state[src]; |
| 182 | |
| 183 | icp = kvmppc_xics_find_server(kvm, server); |
| 184 | if (!icp) |
| 185 | return -EINVAL; |
| 186 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 187 | XICS_DBG("set_xive %#x server %#x prio %#x MP:%d RS:%d\n", |
| 188 | irq, server, priority, |
| 189 | state->masked_pending, state->resend); |
| 190 | |
Paul Mackerras | d19bd862 | 2013-04-17 20:32:04 +0000 | [diff] [blame] | 191 | if (write_xive(xics, ics, state, server, priority, priority)) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 192 | icp_deliver_irq(xics, icp, irq); |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | int kvmppc_xics_get_xive(struct kvm *kvm, u32 irq, u32 *server, u32 *priority) |
| 198 | { |
| 199 | struct kvmppc_xics *xics = kvm->arch.xics; |
| 200 | struct kvmppc_ics *ics; |
| 201 | struct ics_irq_state *state; |
| 202 | u16 src; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 203 | unsigned long flags; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 204 | |
| 205 | if (!xics) |
| 206 | return -ENODEV; |
| 207 | |
| 208 | ics = kvmppc_xics_find_ics(xics, irq, &src); |
| 209 | if (!ics) |
| 210 | return -EINVAL; |
| 211 | state = &ics->irq_state[src]; |
| 212 | |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 213 | local_irq_save(flags); |
| 214 | arch_spin_lock(&ics->lock); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 215 | *server = state->server; |
| 216 | *priority = state->priority; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 217 | arch_spin_unlock(&ics->lock); |
| 218 | local_irq_restore(flags); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
Paul Mackerras | d19bd862 | 2013-04-17 20:32:04 +0000 | [diff] [blame] | 223 | int kvmppc_xics_int_on(struct kvm *kvm, u32 irq) |
| 224 | { |
| 225 | struct kvmppc_xics *xics = kvm->arch.xics; |
| 226 | struct kvmppc_icp *icp; |
| 227 | struct kvmppc_ics *ics; |
| 228 | struct ics_irq_state *state; |
| 229 | u16 src; |
| 230 | |
| 231 | if (!xics) |
| 232 | return -ENODEV; |
| 233 | |
| 234 | ics = kvmppc_xics_find_ics(xics, irq, &src); |
| 235 | if (!ics) |
| 236 | return -EINVAL; |
| 237 | state = &ics->irq_state[src]; |
| 238 | |
| 239 | icp = kvmppc_xics_find_server(kvm, state->server); |
| 240 | if (!icp) |
| 241 | return -EINVAL; |
| 242 | |
| 243 | if (write_xive(xics, ics, state, state->server, state->saved_priority, |
| 244 | state->saved_priority)) |
| 245 | icp_deliver_irq(xics, icp, irq); |
| 246 | |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | int kvmppc_xics_int_off(struct kvm *kvm, u32 irq) |
| 251 | { |
| 252 | struct kvmppc_xics *xics = kvm->arch.xics; |
| 253 | struct kvmppc_ics *ics; |
| 254 | struct ics_irq_state *state; |
| 255 | u16 src; |
| 256 | |
| 257 | if (!xics) |
| 258 | return -ENODEV; |
| 259 | |
| 260 | ics = kvmppc_xics_find_ics(xics, irq, &src); |
| 261 | if (!ics) |
| 262 | return -EINVAL; |
| 263 | state = &ics->irq_state[src]; |
| 264 | |
| 265 | write_xive(xics, ics, state, state->server, MASKED, state->priority); |
| 266 | |
| 267 | return 0; |
| 268 | } |
| 269 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 270 | /* -- ICP routines, including hcalls -- */ |
| 271 | |
| 272 | static inline bool icp_try_update(struct kvmppc_icp *icp, |
| 273 | union kvmppc_icp_state old, |
| 274 | union kvmppc_icp_state new, |
| 275 | bool change_self) |
| 276 | { |
| 277 | bool success; |
| 278 | |
| 279 | /* Calculate new output value */ |
| 280 | new.out_ee = (new.xisr && (new.pending_pri < new.cppr)); |
| 281 | |
| 282 | /* Attempt atomic update */ |
| 283 | success = cmpxchg64(&icp->state.raw, old.raw, new.raw) == old.raw; |
| 284 | if (!success) |
| 285 | goto bail; |
| 286 | |
Alexey Kardashevskiy | ade3ac6 | 2016-04-29 14:57:23 +1000 | [diff] [blame] | 287 | XICS_DBG("UPD [%04lx] - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n", |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 288 | icp->server_num, |
| 289 | old.cppr, old.mfrr, old.pending_pri, old.xisr, |
| 290 | old.need_resend, old.out_ee); |
| 291 | XICS_DBG("UPD - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n", |
| 292 | new.cppr, new.mfrr, new.pending_pri, new.xisr, |
| 293 | new.need_resend, new.out_ee); |
| 294 | /* |
| 295 | * Check for output state update |
| 296 | * |
| 297 | * Note that this is racy since another processor could be updating |
| 298 | * the state already. This is why we never clear the interrupt output |
| 299 | * here, we only ever set it. The clear only happens prior to doing |
| 300 | * an update and only by the processor itself. Currently we do it |
| 301 | * in Accept (H_XIRR) and Up_Cppr (H_XPPR). |
| 302 | * |
| 303 | * We also do not try to figure out whether the EE state has changed, |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 304 | * we unconditionally set it if the new state calls for it. The reason |
| 305 | * for that is that we opportunistically remove the pending interrupt |
| 306 | * flag when raising CPPR, so we need to set it back here if an |
| 307 | * interrupt is still pending. |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 308 | */ |
| 309 | if (new.out_ee) { |
| 310 | kvmppc_book3s_queue_irqprio(icp->vcpu, |
| 311 | BOOK3S_INTERRUPT_EXTERNAL_LEVEL); |
| 312 | if (!change_self) |
Benjamin Herrenschmidt | 54695c3 | 2013-04-17 20:30:50 +0000 | [diff] [blame] | 313 | kvmppc_fast_vcpu_kick(icp->vcpu); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 314 | } |
| 315 | bail: |
| 316 | return success; |
| 317 | } |
| 318 | |
| 319 | static void icp_check_resend(struct kvmppc_xics *xics, |
| 320 | struct kvmppc_icp *icp) |
| 321 | { |
| 322 | u32 icsid; |
| 323 | |
| 324 | /* Order this load with the test for need_resend in the caller */ |
| 325 | smp_rmb(); |
| 326 | for_each_set_bit(icsid, icp->resend_map, xics->max_icsid + 1) { |
| 327 | struct kvmppc_ics *ics = xics->ics[icsid]; |
| 328 | |
| 329 | if (!test_and_clear_bit(icsid, icp->resend_map)) |
| 330 | continue; |
| 331 | if (!ics) |
| 332 | continue; |
| 333 | ics_check_resend(xics, ics, icp); |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | static bool icp_try_to_deliver(struct kvmppc_icp *icp, u32 irq, u8 priority, |
| 338 | u32 *reject) |
| 339 | { |
| 340 | union kvmppc_icp_state old_state, new_state; |
| 341 | bool success; |
| 342 | |
Alexey Kardashevskiy | ade3ac6 | 2016-04-29 14:57:23 +1000 | [diff] [blame] | 343 | XICS_DBG("try deliver %#x(P:%#x) to server %#lx\n", irq, priority, |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 344 | icp->server_num); |
| 345 | |
| 346 | do { |
Christian Borntraeger | 5ee0761 | 2015-01-06 22:41:46 +0100 | [diff] [blame] | 347 | old_state = new_state = READ_ONCE(icp->state); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 348 | |
| 349 | *reject = 0; |
| 350 | |
| 351 | /* See if we can deliver */ |
| 352 | success = new_state.cppr > priority && |
| 353 | new_state.mfrr > priority && |
| 354 | new_state.pending_pri > priority; |
| 355 | |
| 356 | /* |
| 357 | * If we can, check for a rejection and perform the |
| 358 | * delivery |
| 359 | */ |
| 360 | if (success) { |
| 361 | *reject = new_state.xisr; |
| 362 | new_state.xisr = irq; |
| 363 | new_state.pending_pri = priority; |
| 364 | } else { |
| 365 | /* |
| 366 | * If we failed to deliver we set need_resend |
| 367 | * so a subsequent CPPR state change causes us |
| 368 | * to try a new delivery. |
| 369 | */ |
| 370 | new_state.need_resend = true; |
| 371 | } |
| 372 | |
| 373 | } while (!icp_try_update(icp, old_state, new_state, false)); |
| 374 | |
| 375 | return success; |
| 376 | } |
| 377 | |
| 378 | static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp, |
| 379 | u32 new_irq) |
| 380 | { |
| 381 | struct ics_irq_state *state; |
| 382 | struct kvmppc_ics *ics; |
| 383 | u32 reject; |
| 384 | u16 src; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 385 | unsigned long flags; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 386 | |
| 387 | /* |
| 388 | * This is used both for initial delivery of an interrupt and |
| 389 | * for subsequent rejection. |
| 390 | * |
| 391 | * Rejection can be racy vs. resends. We have evaluated the |
| 392 | * rejection in an atomic ICP transaction which is now complete, |
| 393 | * so potentially the ICP can already accept the interrupt again. |
| 394 | * |
| 395 | * So we need to retry the delivery. Essentially the reject path |
| 396 | * boils down to a failed delivery. Always. |
| 397 | * |
| 398 | * Now the interrupt could also have moved to a different target, |
| 399 | * thus we may need to re-do the ICP lookup as well |
| 400 | */ |
| 401 | |
| 402 | again: |
| 403 | /* Get the ICS state and lock it */ |
| 404 | ics = kvmppc_xics_find_ics(xics, new_irq, &src); |
| 405 | if (!ics) { |
| 406 | XICS_DBG("icp_deliver_irq: IRQ 0x%06x not found !\n", new_irq); |
| 407 | return; |
| 408 | } |
| 409 | state = &ics->irq_state[src]; |
| 410 | |
| 411 | /* Get a lock on the ICS */ |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 412 | local_irq_save(flags); |
| 413 | arch_spin_lock(&ics->lock); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 414 | |
| 415 | /* Get our server */ |
| 416 | if (!icp || state->server != icp->server_num) { |
| 417 | icp = kvmppc_xics_find_server(xics->kvm, state->server); |
| 418 | if (!icp) { |
| 419 | pr_warn("icp_deliver_irq: IRQ 0x%06x server 0x%x not found !\n", |
| 420 | new_irq, state->server); |
| 421 | goto out; |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | /* Clear the resend bit of that interrupt */ |
| 426 | state->resend = 0; |
| 427 | |
| 428 | /* |
| 429 | * If masked, bail out |
| 430 | * |
| 431 | * Note: PAPR doesn't mention anything about masked pending |
| 432 | * when doing a resend, only when doing a delivery. |
| 433 | * |
| 434 | * However that would have the effect of losing a masked |
| 435 | * interrupt that was rejected and isn't consistent with |
| 436 | * the whole masked_pending business which is about not |
| 437 | * losing interrupts that occur while masked. |
| 438 | * |
Adam Buchbinder | 446957b | 2016-02-24 10:51:11 -0800 | [diff] [blame] | 439 | * I don't differentiate normal deliveries and resends, this |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 440 | * implementation will differ from PAPR and not lose such |
| 441 | * interrupts. |
| 442 | */ |
| 443 | if (state->priority == MASKED) { |
| 444 | XICS_DBG("irq %#x masked pending\n", new_irq); |
| 445 | state->masked_pending = 1; |
| 446 | goto out; |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * Try the delivery, this will set the need_resend flag |
| 451 | * in the ICP as part of the atomic transaction if the |
| 452 | * delivery is not possible. |
| 453 | * |
| 454 | * Note that if successful, the new delivery might have itself |
| 455 | * rejected an interrupt that was "delivered" before we took the |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 456 | * ics spin lock. |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 457 | * |
| 458 | * In this case we do the whole sequence all over again for the |
| 459 | * new guy. We cannot assume that the rejected interrupt is less |
| 460 | * favored than the new one, and thus doesn't need to be delivered, |
| 461 | * because by the time we exit icp_try_to_deliver() the target |
| 462 | * processor may well have alrady consumed & completed it, and thus |
| 463 | * the rejected interrupt might actually be already acceptable. |
| 464 | */ |
| 465 | if (icp_try_to_deliver(icp, new_irq, state->priority, &reject)) { |
| 466 | /* |
| 467 | * Delivery was successful, did we reject somebody else ? |
| 468 | */ |
| 469 | if (reject && reject != XICS_IPI) { |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 470 | arch_spin_unlock(&ics->lock); |
| 471 | local_irq_restore(flags); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 472 | new_irq = reject; |
| 473 | goto again; |
| 474 | } |
| 475 | } else { |
| 476 | /* |
| 477 | * We failed to deliver the interrupt we need to set the |
| 478 | * resend map bit and mark the ICS state as needing a resend |
| 479 | */ |
| 480 | set_bit(ics->icsid, icp->resend_map); |
| 481 | state->resend = 1; |
| 482 | |
| 483 | /* |
| 484 | * If the need_resend flag got cleared in the ICP some time |
| 485 | * between icp_try_to_deliver() atomic update and now, then |
| 486 | * we know it might have missed the resend_map bit. So we |
| 487 | * retry |
| 488 | */ |
| 489 | smp_mb(); |
| 490 | if (!icp->state.need_resend) { |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 491 | arch_spin_unlock(&ics->lock); |
| 492 | local_irq_restore(flags); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 493 | goto again; |
| 494 | } |
| 495 | } |
| 496 | out: |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 497 | arch_spin_unlock(&ics->lock); |
| 498 | local_irq_restore(flags); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | static void icp_down_cppr(struct kvmppc_xics *xics, struct kvmppc_icp *icp, |
| 502 | u8 new_cppr) |
| 503 | { |
| 504 | union kvmppc_icp_state old_state, new_state; |
| 505 | bool resend; |
| 506 | |
| 507 | /* |
| 508 | * This handles several related states in one operation: |
| 509 | * |
| 510 | * ICP State: Down_CPPR |
| 511 | * |
| 512 | * Load CPPR with new value and if the XISR is 0 |
| 513 | * then check for resends: |
| 514 | * |
| 515 | * ICP State: Resend |
| 516 | * |
| 517 | * If MFRR is more favored than CPPR, check for IPIs |
| 518 | * and notify ICS of a potential resend. This is done |
| 519 | * asynchronously (when used in real mode, we will have |
| 520 | * to exit here). |
| 521 | * |
| 522 | * We do not handle the complete Check_IPI as documented |
| 523 | * here. In the PAPR, this state will be used for both |
| 524 | * Set_MFRR and Down_CPPR. However, we know that we aren't |
| 525 | * changing the MFRR state here so we don't need to handle |
| 526 | * the case of an MFRR causing a reject of a pending irq, |
| 527 | * this will have been handled when the MFRR was set in the |
| 528 | * first place. |
| 529 | * |
| 530 | * Thus we don't have to handle rejects, only resends. |
| 531 | * |
| 532 | * When implementing real mode for HV KVM, resend will lead to |
| 533 | * a H_TOO_HARD return and the whole transaction will be handled |
| 534 | * in virtual mode. |
| 535 | */ |
| 536 | do { |
Christian Borntraeger | 5ee0761 | 2015-01-06 22:41:46 +0100 | [diff] [blame] | 537 | old_state = new_state = READ_ONCE(icp->state); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 538 | |
| 539 | /* Down_CPPR */ |
| 540 | new_state.cppr = new_cppr; |
| 541 | |
| 542 | /* |
| 543 | * Cut down Resend / Check_IPI / IPI |
| 544 | * |
| 545 | * The logic is that we cannot have a pending interrupt |
| 546 | * trumped by an IPI at this point (see above), so we |
| 547 | * know that either the pending interrupt is already an |
| 548 | * IPI (in which case we don't care to override it) or |
| 549 | * it's either more favored than us or non existent |
| 550 | */ |
| 551 | if (new_state.mfrr < new_cppr && |
| 552 | new_state.mfrr <= new_state.pending_pri) { |
| 553 | WARN_ON(new_state.xisr != XICS_IPI && |
| 554 | new_state.xisr != 0); |
| 555 | new_state.pending_pri = new_state.mfrr; |
| 556 | new_state.xisr = XICS_IPI; |
| 557 | } |
| 558 | |
| 559 | /* Latch/clear resend bit */ |
| 560 | resend = new_state.need_resend; |
| 561 | new_state.need_resend = 0; |
| 562 | |
| 563 | } while (!icp_try_update(icp, old_state, new_state, true)); |
| 564 | |
| 565 | /* |
| 566 | * Now handle resend checks. Those are asynchronous to the ICP |
| 567 | * state update in HW (ie bus transactions) so we can handle them |
| 568 | * separately here too |
| 569 | */ |
| 570 | if (resend) |
| 571 | icp_check_resend(xics, icp); |
| 572 | } |
| 573 | |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 574 | static noinline unsigned long kvmppc_h_xirr(struct kvm_vcpu *vcpu) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 575 | { |
| 576 | union kvmppc_icp_state old_state, new_state; |
| 577 | struct kvmppc_icp *icp = vcpu->arch.icp; |
| 578 | u32 xirr; |
| 579 | |
| 580 | /* First, remove EE from the processor */ |
| 581 | kvmppc_book3s_dequeue_irqprio(icp->vcpu, |
| 582 | BOOK3S_INTERRUPT_EXTERNAL_LEVEL); |
| 583 | |
| 584 | /* |
| 585 | * ICP State: Accept_Interrupt |
| 586 | * |
| 587 | * Return the pending interrupt (if any) along with the |
| 588 | * current CPPR, then clear the XISR & set CPPR to the |
| 589 | * pending priority |
| 590 | */ |
| 591 | do { |
Christian Borntraeger | 5ee0761 | 2015-01-06 22:41:46 +0100 | [diff] [blame] | 592 | old_state = new_state = READ_ONCE(icp->state); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 593 | |
| 594 | xirr = old_state.xisr | (((u32)old_state.cppr) << 24); |
| 595 | if (!old_state.xisr) |
| 596 | break; |
| 597 | new_state.cppr = new_state.pending_pri; |
| 598 | new_state.pending_pri = 0xff; |
| 599 | new_state.xisr = 0; |
| 600 | |
| 601 | } while (!icp_try_update(icp, old_state, new_state, true)); |
| 602 | |
| 603 | XICS_DBG("h_xirr vcpu %d xirr %#x\n", vcpu->vcpu_id, xirr); |
| 604 | |
| 605 | return xirr; |
| 606 | } |
| 607 | |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 608 | static noinline int kvmppc_h_ipi(struct kvm_vcpu *vcpu, unsigned long server, |
| 609 | unsigned long mfrr) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 610 | { |
| 611 | union kvmppc_icp_state old_state, new_state; |
| 612 | struct kvmppc_xics *xics = vcpu->kvm->arch.xics; |
| 613 | struct kvmppc_icp *icp; |
| 614 | u32 reject; |
| 615 | bool resend; |
| 616 | bool local; |
| 617 | |
| 618 | XICS_DBG("h_ipi vcpu %d to server %lu mfrr %#lx\n", |
| 619 | vcpu->vcpu_id, server, mfrr); |
| 620 | |
| 621 | icp = vcpu->arch.icp; |
| 622 | local = icp->server_num == server; |
| 623 | if (!local) { |
| 624 | icp = kvmppc_xics_find_server(vcpu->kvm, server); |
| 625 | if (!icp) |
| 626 | return H_PARAMETER; |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * ICP state: Set_MFRR |
| 631 | * |
| 632 | * If the CPPR is more favored than the new MFRR, then |
| 633 | * nothing needs to be rejected as there can be no XISR to |
| 634 | * reject. If the MFRR is being made less favored then |
| 635 | * there might be a previously-rejected interrupt needing |
| 636 | * to be resent. |
| 637 | * |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 638 | * ICP state: Check_IPI |
Suresh E. Warrier | 5b88cda | 2014-11-03 15:51:59 +1100 | [diff] [blame] | 639 | * |
| 640 | * If the CPPR is less favored, then we might be replacing |
| 641 | * an interrupt, and thus need to possibly reject it. |
| 642 | * |
| 643 | * ICP State: IPI |
| 644 | * |
| 645 | * Besides rejecting any pending interrupts, we also |
| 646 | * update XISR and pending_pri to mark IPI as pending. |
| 647 | * |
| 648 | * PAPR does not describe this state, but if the MFRR is being |
| 649 | * made less favored than its earlier value, there might be |
| 650 | * a previously-rejected interrupt needing to be resent. |
| 651 | * Ideally, we would want to resend only if |
| 652 | * prio(pending_interrupt) < mfrr && |
| 653 | * prio(pending_interrupt) < cppr |
| 654 | * where pending interrupt is the one that was rejected. But |
| 655 | * we don't have that state, so we simply trigger a resend |
| 656 | * whenever the MFRR is made less favored. |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 657 | */ |
| 658 | do { |
Christian Borntraeger | 5ee0761 | 2015-01-06 22:41:46 +0100 | [diff] [blame] | 659 | old_state = new_state = READ_ONCE(icp->state); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 660 | |
| 661 | /* Set_MFRR */ |
| 662 | new_state.mfrr = mfrr; |
| 663 | |
| 664 | /* Check_IPI */ |
| 665 | reject = 0; |
| 666 | resend = false; |
| 667 | if (mfrr < new_state.cppr) { |
| 668 | /* Reject a pending interrupt if not an IPI */ |
Suresh E. Warrier | 5b88cda | 2014-11-03 15:51:59 +1100 | [diff] [blame] | 669 | if (mfrr <= new_state.pending_pri) { |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 670 | reject = new_state.xisr; |
Suresh E. Warrier | 5b88cda | 2014-11-03 15:51:59 +1100 | [diff] [blame] | 671 | new_state.pending_pri = mfrr; |
| 672 | new_state.xisr = XICS_IPI; |
| 673 | } |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 674 | } |
| 675 | |
Suresh E. Warrier | 5b88cda | 2014-11-03 15:51:59 +1100 | [diff] [blame] | 676 | if (mfrr > old_state.mfrr) { |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 677 | resend = new_state.need_resend; |
| 678 | new_state.need_resend = 0; |
| 679 | } |
| 680 | } while (!icp_try_update(icp, old_state, new_state, local)); |
| 681 | |
| 682 | /* Handle reject */ |
| 683 | if (reject && reject != XICS_IPI) |
| 684 | icp_deliver_irq(xics, icp, reject); |
| 685 | |
| 686 | /* Handle resend */ |
| 687 | if (resend) |
| 688 | icp_check_resend(xics, icp); |
| 689 | |
| 690 | return H_SUCCESS; |
| 691 | } |
| 692 | |
Paul Mackerras | 8e44ddc | 2013-05-23 15:42:21 +0000 | [diff] [blame] | 693 | static int kvmppc_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server) |
| 694 | { |
| 695 | union kvmppc_icp_state state; |
| 696 | struct kvmppc_icp *icp; |
| 697 | |
| 698 | icp = vcpu->arch.icp; |
| 699 | if (icp->server_num != server) { |
| 700 | icp = kvmppc_xics_find_server(vcpu->kvm, server); |
| 701 | if (!icp) |
| 702 | return H_PARAMETER; |
| 703 | } |
Christian Borntraeger | 5ee0761 | 2015-01-06 22:41:46 +0100 | [diff] [blame] | 704 | state = READ_ONCE(icp->state); |
Paul Mackerras | 8e44ddc | 2013-05-23 15:42:21 +0000 | [diff] [blame] | 705 | kvmppc_set_gpr(vcpu, 4, ((u32)state.cppr << 24) | state.xisr); |
| 706 | kvmppc_set_gpr(vcpu, 5, state.mfrr); |
| 707 | return H_SUCCESS; |
| 708 | } |
| 709 | |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 710 | static noinline void kvmppc_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 711 | { |
| 712 | union kvmppc_icp_state old_state, new_state; |
| 713 | struct kvmppc_xics *xics = vcpu->kvm->arch.xics; |
| 714 | struct kvmppc_icp *icp = vcpu->arch.icp; |
| 715 | u32 reject; |
| 716 | |
| 717 | XICS_DBG("h_cppr vcpu %d cppr %#lx\n", vcpu->vcpu_id, cppr); |
| 718 | |
| 719 | /* |
| 720 | * ICP State: Set_CPPR |
| 721 | * |
| 722 | * We can safely compare the new value with the current |
| 723 | * value outside of the transaction as the CPPR is only |
| 724 | * ever changed by the processor on itself |
| 725 | */ |
| 726 | if (cppr > icp->state.cppr) |
| 727 | icp_down_cppr(xics, icp, cppr); |
| 728 | else if (cppr == icp->state.cppr) |
| 729 | return; |
| 730 | |
| 731 | /* |
| 732 | * ICP State: Up_CPPR |
| 733 | * |
| 734 | * The processor is raising its priority, this can result |
| 735 | * in a rejection of a pending interrupt: |
| 736 | * |
| 737 | * ICP State: Reject_Current |
| 738 | * |
| 739 | * We can remove EE from the current processor, the update |
| 740 | * transaction will set it again if needed |
| 741 | */ |
| 742 | kvmppc_book3s_dequeue_irqprio(icp->vcpu, |
| 743 | BOOK3S_INTERRUPT_EXTERNAL_LEVEL); |
| 744 | |
| 745 | do { |
Christian Borntraeger | 5ee0761 | 2015-01-06 22:41:46 +0100 | [diff] [blame] | 746 | old_state = new_state = READ_ONCE(icp->state); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 747 | |
| 748 | reject = 0; |
| 749 | new_state.cppr = cppr; |
| 750 | |
| 751 | if (cppr <= new_state.pending_pri) { |
| 752 | reject = new_state.xisr; |
| 753 | new_state.xisr = 0; |
| 754 | new_state.pending_pri = 0xff; |
| 755 | } |
| 756 | |
| 757 | } while (!icp_try_update(icp, old_state, new_state, true)); |
| 758 | |
| 759 | /* |
| 760 | * Check for rejects. They are handled by doing a new delivery |
| 761 | * attempt (see comments in icp_deliver_irq). |
| 762 | */ |
| 763 | if (reject && reject != XICS_IPI) |
| 764 | icp_deliver_irq(xics, icp, reject); |
| 765 | } |
| 766 | |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 767 | static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 768 | { |
| 769 | struct kvmppc_xics *xics = vcpu->kvm->arch.xics; |
| 770 | struct kvmppc_icp *icp = vcpu->arch.icp; |
| 771 | struct kvmppc_ics *ics; |
| 772 | struct ics_irq_state *state; |
| 773 | u32 irq = xirr & 0x00ffffff; |
| 774 | u16 src; |
| 775 | |
| 776 | XICS_DBG("h_eoi vcpu %d eoi %#lx\n", vcpu->vcpu_id, xirr); |
| 777 | |
| 778 | /* |
| 779 | * ICP State: EOI |
| 780 | * |
| 781 | * Note: If EOI is incorrectly used by SW to lower the CPPR |
| 782 | * value (ie more favored), we do not check for rejection of |
| 783 | * a pending interrupt, this is a SW error and PAPR sepcifies |
| 784 | * that we don't have to deal with it. |
| 785 | * |
| 786 | * The sending of an EOI to the ICS is handled after the |
| 787 | * CPPR update |
| 788 | * |
| 789 | * ICP State: Down_CPPR which we handle |
| 790 | * in a separate function as it's shared with H_CPPR. |
| 791 | */ |
| 792 | icp_down_cppr(xics, icp, xirr >> 24); |
| 793 | |
| 794 | /* IPIs have no EOI */ |
| 795 | if (irq == XICS_IPI) |
| 796 | return H_SUCCESS; |
| 797 | /* |
| 798 | * EOI handling: If the interrupt is still asserted, we need to |
| 799 | * resend it. We can take a lockless "peek" at the ICS state here. |
| 800 | * |
| 801 | * "Message" interrupts will never have "asserted" set |
| 802 | */ |
| 803 | ics = kvmppc_xics_find_ics(xics, irq, &src); |
| 804 | if (!ics) { |
| 805 | XICS_DBG("h_eoi: IRQ 0x%06x not found !\n", irq); |
| 806 | return H_PARAMETER; |
| 807 | } |
| 808 | state = &ics->irq_state[src]; |
| 809 | |
| 810 | /* Still asserted, resend it */ |
| 811 | if (state->asserted) |
| 812 | icp_deliver_irq(xics, icp, irq); |
| 813 | |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 814 | kvm_notify_acked_irq(vcpu->kvm, 0, irq); |
| 815 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 816 | return H_SUCCESS; |
| 817 | } |
| 818 | |
Suresh Warrier | f7af520 | 2016-08-19 15:35:52 +1000 | [diff] [blame] | 819 | int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall) |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 820 | { |
| 821 | struct kvmppc_xics *xics = vcpu->kvm->arch.xics; |
| 822 | struct kvmppc_icp *icp = vcpu->arch.icp; |
| 823 | |
| 824 | XICS_DBG("XICS_RM: H_%x completing, act: %x state: %lx tgt: %p\n", |
| 825 | hcall, icp->rm_action, icp->rm_dbgstate.raw, icp->rm_dbgtgt); |
| 826 | |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 827 | if (icp->rm_action & XICS_RM_KICK_VCPU) { |
| 828 | icp->n_rm_kick_vcpu++; |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 829 | kvmppc_fast_vcpu_kick(icp->rm_kick_target); |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 830 | } |
| 831 | if (icp->rm_action & XICS_RM_CHECK_RESEND) { |
| 832 | icp->n_rm_check_resend++; |
Suresh E. Warrier | 5b88cda | 2014-11-03 15:51:59 +1100 | [diff] [blame] | 833 | icp_check_resend(xics, icp->rm_resend_icp); |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 834 | } |
| 835 | if (icp->rm_action & XICS_RM_REJECT) { |
| 836 | icp->n_rm_reject++; |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 837 | icp_deliver_irq(xics, icp, icp->rm_reject); |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 838 | } |
| 839 | if (icp->rm_action & XICS_RM_NOTIFY_EOI) { |
| 840 | icp->n_rm_notify_eoi++; |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 841 | kvm_notify_acked_irq(vcpu->kvm, 0, icp->rm_eoied_irq); |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 842 | } |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 843 | |
| 844 | icp->rm_action = 0; |
| 845 | |
| 846 | return H_SUCCESS; |
| 847 | } |
Suresh Warrier | f7af520 | 2016-08-19 15:35:52 +1000 | [diff] [blame] | 848 | EXPORT_SYMBOL_GPL(kvmppc_xics_rm_complete); |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 849 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 850 | int kvmppc_xics_hcall(struct kvm_vcpu *vcpu, u32 req) |
| 851 | { |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 852 | struct kvmppc_xics *xics = vcpu->kvm->arch.xics; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 853 | unsigned long res; |
| 854 | int rc = H_SUCCESS; |
| 855 | |
| 856 | /* Check if we have an ICP */ |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 857 | if (!xics || !vcpu->arch.icp) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 858 | return H_HARDWARE; |
| 859 | |
Paul Mackerras | 8e44ddc | 2013-05-23 15:42:21 +0000 | [diff] [blame] | 860 | /* These requests don't have real-mode implementations at present */ |
| 861 | switch (req) { |
| 862 | case H_XIRR_X: |
| 863 | res = kvmppc_h_xirr(vcpu); |
| 864 | kvmppc_set_gpr(vcpu, 4, res); |
| 865 | kvmppc_set_gpr(vcpu, 5, get_tb()); |
| 866 | return rc; |
| 867 | case H_IPOLL: |
| 868 | rc = kvmppc_h_ipoll(vcpu, kvmppc_get_gpr(vcpu, 4)); |
| 869 | return rc; |
| 870 | } |
| 871 | |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 872 | /* Check for real mode returning too hard */ |
Aneesh Kumar K.V | a78b55d | 2013-10-07 22:18:02 +0530 | [diff] [blame] | 873 | if (xics->real_mode && is_kvmppc_hv_enabled(vcpu->kvm)) |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 874 | return kvmppc_xics_rm_complete(vcpu, req); |
| 875 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 876 | switch (req) { |
| 877 | case H_XIRR: |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 878 | res = kvmppc_h_xirr(vcpu); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 879 | kvmppc_set_gpr(vcpu, 4, res); |
| 880 | break; |
| 881 | case H_CPPR: |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 882 | kvmppc_h_cppr(vcpu, kvmppc_get_gpr(vcpu, 4)); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 883 | break; |
| 884 | case H_EOI: |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 885 | rc = kvmppc_h_eoi(vcpu, kvmppc_get_gpr(vcpu, 4)); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 886 | break; |
| 887 | case H_IPI: |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 888 | rc = kvmppc_h_ipi(vcpu, kvmppc_get_gpr(vcpu, 4), |
| 889 | kvmppc_get_gpr(vcpu, 5)); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 890 | break; |
| 891 | } |
| 892 | |
| 893 | return rc; |
| 894 | } |
Aneesh Kumar K.V | 2ba9f0d | 2013-10-07 22:17:59 +0530 | [diff] [blame] | 895 | EXPORT_SYMBOL_GPL(kvmppc_xics_hcall); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 896 | |
| 897 | |
| 898 | /* -- Initialisation code etc. -- */ |
| 899 | |
Suresh Warrier | af893c7 | 2016-08-19 15:35:53 +1000 | [diff] [blame] | 900 | static void xics_debugfs_irqmap(struct seq_file *m, |
| 901 | struct kvmppc_passthru_irqmap *pimap) |
| 902 | { |
| 903 | int i; |
| 904 | |
| 905 | if (!pimap) |
| 906 | return; |
| 907 | seq_printf(m, "========\nPIRQ mappings: %d maps\n===========\n", |
| 908 | pimap->n_mapped); |
| 909 | for (i = 0; i < pimap->n_mapped; i++) { |
| 910 | seq_printf(m, "r_hwirq=%x, v_hwirq=%x\n", |
| 911 | pimap->mapped[i].r_hwirq, pimap->mapped[i].v_hwirq); |
| 912 | } |
| 913 | } |
| 914 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 915 | static int xics_debug_show(struct seq_file *m, void *private) |
| 916 | { |
| 917 | struct kvmppc_xics *xics = m->private; |
| 918 | struct kvm *kvm = xics->kvm; |
| 919 | struct kvm_vcpu *vcpu; |
| 920 | int icsid, i; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 921 | unsigned long flags; |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 922 | unsigned long t_rm_kick_vcpu, t_rm_check_resend; |
| 923 | unsigned long t_rm_reject, t_rm_notify_eoi; |
Suresh Warrier | 6e0365b | 2015-03-20 20:39:48 +1100 | [diff] [blame] | 924 | unsigned long t_reject, t_check_resend; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 925 | |
| 926 | if (!kvm) |
| 927 | return 0; |
| 928 | |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 929 | t_rm_kick_vcpu = 0; |
| 930 | t_rm_notify_eoi = 0; |
| 931 | t_rm_check_resend = 0; |
| 932 | t_rm_reject = 0; |
Suresh Warrier | 6e0365b | 2015-03-20 20:39:48 +1100 | [diff] [blame] | 933 | t_check_resend = 0; |
| 934 | t_reject = 0; |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 935 | |
Suresh Warrier | af893c7 | 2016-08-19 15:35:53 +1000 | [diff] [blame] | 936 | xics_debugfs_irqmap(m, kvm->arch.pimap); |
| 937 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 938 | seq_printf(m, "=========\nICP state\n=========\n"); |
| 939 | |
| 940 | kvm_for_each_vcpu(i, vcpu, kvm) { |
| 941 | struct kvmppc_icp *icp = vcpu->arch.icp; |
| 942 | union kvmppc_icp_state state; |
| 943 | |
| 944 | if (!icp) |
| 945 | continue; |
| 946 | |
Christian Borntraeger | 5ee0761 | 2015-01-06 22:41:46 +0100 | [diff] [blame] | 947 | state.raw = READ_ONCE(icp->state.raw); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 948 | seq_printf(m, "cpu server %#lx XIRR:%#x PPRI:%#x CPPR:%#x MFRR:%#x OUT:%d NR:%d\n", |
| 949 | icp->server_num, state.xisr, |
| 950 | state.pending_pri, state.cppr, state.mfrr, |
| 951 | state.out_ee, state.need_resend); |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 952 | t_rm_kick_vcpu += icp->n_rm_kick_vcpu; |
| 953 | t_rm_notify_eoi += icp->n_rm_notify_eoi; |
| 954 | t_rm_check_resend += icp->n_rm_check_resend; |
| 955 | t_rm_reject += icp->n_rm_reject; |
Suresh Warrier | 6e0365b | 2015-03-20 20:39:48 +1100 | [diff] [blame] | 956 | t_check_resend += icp->n_check_resend; |
| 957 | t_reject += icp->n_reject; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 958 | } |
| 959 | |
Suresh Warrier | 6e0365b | 2015-03-20 20:39:48 +1100 | [diff] [blame] | 960 | seq_printf(m, "ICP Guest->Host totals: kick_vcpu=%lu check_resend=%lu reject=%lu notify_eoi=%lu\n", |
Suresh E. Warrier | 878610f | 2015-03-20 20:39:45 +1100 | [diff] [blame] | 961 | t_rm_kick_vcpu, t_rm_check_resend, |
| 962 | t_rm_reject, t_rm_notify_eoi); |
Suresh Warrier | 6e0365b | 2015-03-20 20:39:48 +1100 | [diff] [blame] | 963 | seq_printf(m, "ICP Real Mode totals: check_resend=%lu resend=%lu\n", |
| 964 | t_check_resend, t_reject); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 965 | for (icsid = 0; icsid <= KVMPPC_XICS_MAX_ICS_ID; icsid++) { |
| 966 | struct kvmppc_ics *ics = xics->ics[icsid]; |
| 967 | |
| 968 | if (!ics) |
| 969 | continue; |
| 970 | |
| 971 | seq_printf(m, "=========\nICS state for ICS 0x%x\n=========\n", |
| 972 | icsid); |
| 973 | |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 974 | local_irq_save(flags); |
| 975 | arch_spin_lock(&ics->lock); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 976 | |
| 977 | for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) { |
| 978 | struct ics_irq_state *irq = &ics->irq_state[i]; |
| 979 | |
| 980 | seq_printf(m, "irq 0x%06x: server %#x prio %#x save prio %#x asserted %d resend %d masked pending %d\n", |
| 981 | irq->number, irq->server, irq->priority, |
| 982 | irq->saved_priority, irq->asserted, |
| 983 | irq->resend, irq->masked_pending); |
| 984 | |
| 985 | } |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 986 | arch_spin_unlock(&ics->lock); |
| 987 | local_irq_restore(flags); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 988 | } |
| 989 | return 0; |
| 990 | } |
| 991 | |
| 992 | static int xics_debug_open(struct inode *inode, struct file *file) |
| 993 | { |
| 994 | return single_open(file, xics_debug_show, inode->i_private); |
| 995 | } |
| 996 | |
| 997 | static const struct file_operations xics_debug_fops = { |
| 998 | .open = xics_debug_open, |
| 999 | .read = seq_read, |
| 1000 | .llseek = seq_lseek, |
| 1001 | .release = single_release, |
| 1002 | }; |
| 1003 | |
| 1004 | static void xics_debugfs_init(struct kvmppc_xics *xics) |
| 1005 | { |
| 1006 | char *name; |
| 1007 | |
| 1008 | name = kasprintf(GFP_KERNEL, "kvm-xics-%p", xics); |
| 1009 | if (!name) { |
| 1010 | pr_err("%s: no memory for name\n", __func__); |
| 1011 | return; |
| 1012 | } |
| 1013 | |
| 1014 | xics->dentry = debugfs_create_file(name, S_IRUGO, powerpc_debugfs_root, |
| 1015 | xics, &xics_debug_fops); |
| 1016 | |
| 1017 | pr_debug("%s: created %s\n", __func__, name); |
| 1018 | kfree(name); |
| 1019 | } |
| 1020 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1021 | static struct kvmppc_ics *kvmppc_xics_create_ics(struct kvm *kvm, |
| 1022 | struct kvmppc_xics *xics, int irq) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1023 | { |
| 1024 | struct kvmppc_ics *ics; |
| 1025 | int i, icsid; |
| 1026 | |
| 1027 | icsid = irq >> KVMPPC_XICS_ICS_SHIFT; |
| 1028 | |
| 1029 | mutex_lock(&kvm->lock); |
| 1030 | |
| 1031 | /* ICS already exists - somebody else got here first */ |
| 1032 | if (xics->ics[icsid]) |
| 1033 | goto out; |
| 1034 | |
| 1035 | /* Create the ICS */ |
| 1036 | ics = kzalloc(sizeof(struct kvmppc_ics), GFP_KERNEL); |
| 1037 | if (!ics) |
| 1038 | goto out; |
| 1039 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1040 | ics->icsid = icsid; |
| 1041 | |
| 1042 | for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) { |
| 1043 | ics->irq_state[i].number = (icsid << KVMPPC_XICS_ICS_SHIFT) | i; |
| 1044 | ics->irq_state[i].priority = MASKED; |
| 1045 | ics->irq_state[i].saved_priority = MASKED; |
| 1046 | } |
| 1047 | smp_wmb(); |
| 1048 | xics->ics[icsid] = ics; |
| 1049 | |
| 1050 | if (icsid > xics->max_icsid) |
| 1051 | xics->max_icsid = icsid; |
| 1052 | |
| 1053 | out: |
| 1054 | mutex_unlock(&kvm->lock); |
| 1055 | return xics->ics[icsid]; |
| 1056 | } |
| 1057 | |
| 1058 | int kvmppc_xics_create_icp(struct kvm_vcpu *vcpu, unsigned long server_num) |
| 1059 | { |
| 1060 | struct kvmppc_icp *icp; |
| 1061 | |
| 1062 | if (!vcpu->kvm->arch.xics) |
| 1063 | return -ENODEV; |
| 1064 | |
| 1065 | if (kvmppc_xics_find_server(vcpu->kvm, server_num)) |
| 1066 | return -EEXIST; |
| 1067 | |
| 1068 | icp = kzalloc(sizeof(struct kvmppc_icp), GFP_KERNEL); |
| 1069 | if (!icp) |
| 1070 | return -ENOMEM; |
| 1071 | |
| 1072 | icp->vcpu = vcpu; |
| 1073 | icp->server_num = server_num; |
| 1074 | icp->state.mfrr = MASKED; |
| 1075 | icp->state.pending_pri = MASKED; |
| 1076 | vcpu->arch.icp = icp; |
| 1077 | |
| 1078 | XICS_DBG("created server for vcpu %d\n", vcpu->vcpu_id); |
| 1079 | |
| 1080 | return 0; |
| 1081 | } |
| 1082 | |
Paul Mackerras | 8b78645 | 2013-04-17 20:32:26 +0000 | [diff] [blame] | 1083 | u64 kvmppc_xics_get_icp(struct kvm_vcpu *vcpu) |
| 1084 | { |
| 1085 | struct kvmppc_icp *icp = vcpu->arch.icp; |
| 1086 | union kvmppc_icp_state state; |
| 1087 | |
| 1088 | if (!icp) |
| 1089 | return 0; |
| 1090 | state = icp->state; |
| 1091 | return ((u64)state.cppr << KVM_REG_PPC_ICP_CPPR_SHIFT) | |
| 1092 | ((u64)state.xisr << KVM_REG_PPC_ICP_XISR_SHIFT) | |
| 1093 | ((u64)state.mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT) | |
| 1094 | ((u64)state.pending_pri << KVM_REG_PPC_ICP_PPRI_SHIFT); |
| 1095 | } |
| 1096 | |
| 1097 | int kvmppc_xics_set_icp(struct kvm_vcpu *vcpu, u64 icpval) |
| 1098 | { |
| 1099 | struct kvmppc_icp *icp = vcpu->arch.icp; |
| 1100 | struct kvmppc_xics *xics = vcpu->kvm->arch.xics; |
| 1101 | union kvmppc_icp_state old_state, new_state; |
| 1102 | struct kvmppc_ics *ics; |
| 1103 | u8 cppr, mfrr, pending_pri; |
| 1104 | u32 xisr; |
| 1105 | u16 src; |
| 1106 | bool resend; |
| 1107 | |
| 1108 | if (!icp || !xics) |
| 1109 | return -ENOENT; |
| 1110 | |
| 1111 | cppr = icpval >> KVM_REG_PPC_ICP_CPPR_SHIFT; |
| 1112 | xisr = (icpval >> KVM_REG_PPC_ICP_XISR_SHIFT) & |
| 1113 | KVM_REG_PPC_ICP_XISR_MASK; |
| 1114 | mfrr = icpval >> KVM_REG_PPC_ICP_MFRR_SHIFT; |
| 1115 | pending_pri = icpval >> KVM_REG_PPC_ICP_PPRI_SHIFT; |
| 1116 | |
| 1117 | /* Require the new state to be internally consistent */ |
| 1118 | if (xisr == 0) { |
| 1119 | if (pending_pri != 0xff) |
| 1120 | return -EINVAL; |
| 1121 | } else if (xisr == XICS_IPI) { |
| 1122 | if (pending_pri != mfrr || pending_pri >= cppr) |
| 1123 | return -EINVAL; |
| 1124 | } else { |
| 1125 | if (pending_pri >= mfrr || pending_pri >= cppr) |
| 1126 | return -EINVAL; |
| 1127 | ics = kvmppc_xics_find_ics(xics, xisr, &src); |
| 1128 | if (!ics) |
| 1129 | return -EINVAL; |
| 1130 | } |
| 1131 | |
| 1132 | new_state.raw = 0; |
| 1133 | new_state.cppr = cppr; |
| 1134 | new_state.xisr = xisr; |
| 1135 | new_state.mfrr = mfrr; |
| 1136 | new_state.pending_pri = pending_pri; |
| 1137 | |
| 1138 | /* |
| 1139 | * Deassert the CPU interrupt request. |
| 1140 | * icp_try_update will reassert it if necessary. |
| 1141 | */ |
| 1142 | kvmppc_book3s_dequeue_irqprio(icp->vcpu, |
| 1143 | BOOK3S_INTERRUPT_EXTERNAL_LEVEL); |
| 1144 | |
| 1145 | /* |
| 1146 | * Note that if we displace an interrupt from old_state.xisr, |
| 1147 | * we don't mark it as rejected. We expect userspace to set |
| 1148 | * the state of the interrupt sources to be consistent with |
| 1149 | * the ICP states (either before or afterwards, which doesn't |
| 1150 | * matter). We do handle resends due to CPPR becoming less |
| 1151 | * favoured because that is necessary to end up with a |
| 1152 | * consistent state in the situation where userspace restores |
| 1153 | * the ICS states before the ICP states. |
| 1154 | */ |
| 1155 | do { |
Christian Borntraeger | 5ee0761 | 2015-01-06 22:41:46 +0100 | [diff] [blame] | 1156 | old_state = READ_ONCE(icp->state); |
Paul Mackerras | 8b78645 | 2013-04-17 20:32:26 +0000 | [diff] [blame] | 1157 | |
| 1158 | if (new_state.mfrr <= old_state.mfrr) { |
| 1159 | resend = false; |
| 1160 | new_state.need_resend = old_state.need_resend; |
| 1161 | } else { |
| 1162 | resend = old_state.need_resend; |
| 1163 | new_state.need_resend = 0; |
| 1164 | } |
| 1165 | } while (!icp_try_update(icp, old_state, new_state, false)); |
| 1166 | |
| 1167 | if (resend) |
| 1168 | icp_check_resend(xics, icp); |
| 1169 | |
| 1170 | return 0; |
| 1171 | } |
| 1172 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1173 | static int xics_get_source(struct kvmppc_xics *xics, long irq, u64 addr) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1174 | { |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1175 | int ret; |
| 1176 | struct kvmppc_ics *ics; |
| 1177 | struct ics_irq_state *irqp; |
| 1178 | u64 __user *ubufp = (u64 __user *) addr; |
| 1179 | u16 idx; |
| 1180 | u64 val, prio; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 1181 | unsigned long flags; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1182 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1183 | ics = kvmppc_xics_find_ics(xics, irq, &idx); |
| 1184 | if (!ics) |
| 1185 | return -ENOENT; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1186 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1187 | irqp = &ics->irq_state[idx]; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 1188 | local_irq_save(flags); |
| 1189 | arch_spin_lock(&ics->lock); |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1190 | ret = -ENOENT; |
| 1191 | if (irqp->exists) { |
| 1192 | val = irqp->server; |
| 1193 | prio = irqp->priority; |
| 1194 | if (prio == MASKED) { |
| 1195 | val |= KVM_XICS_MASKED; |
| 1196 | prio = irqp->saved_priority; |
| 1197 | } |
| 1198 | val |= prio << KVM_XICS_PRIORITY_SHIFT; |
Paul Mackerras | b1a4286 | 2016-05-04 21:07:52 +1000 | [diff] [blame] | 1199 | if (irqp->lsi) { |
| 1200 | val |= KVM_XICS_LEVEL_SENSITIVE; |
| 1201 | if (irqp->asserted) |
| 1202 | val |= KVM_XICS_PENDING; |
| 1203 | } else if (irqp->masked_pending || irqp->resend) |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1204 | val |= KVM_XICS_PENDING; |
| 1205 | ret = 0; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1206 | } |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 1207 | arch_spin_unlock(&ics->lock); |
| 1208 | local_irq_restore(flags); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1209 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1210 | if (!ret && put_user(val, ubufp)) |
| 1211 | ret = -EFAULT; |
| 1212 | |
| 1213 | return ret; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1214 | } |
| 1215 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1216 | static int xics_set_source(struct kvmppc_xics *xics, long irq, u64 addr) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1217 | { |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1218 | struct kvmppc_ics *ics; |
| 1219 | struct ics_irq_state *irqp; |
| 1220 | u64 __user *ubufp = (u64 __user *) addr; |
| 1221 | u16 idx; |
| 1222 | u64 val; |
| 1223 | u8 prio; |
| 1224 | u32 server; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 1225 | unsigned long flags; |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1226 | |
| 1227 | if (irq < KVMPPC_XICS_FIRST_IRQ || irq >= KVMPPC_XICS_NR_IRQS) |
| 1228 | return -ENOENT; |
| 1229 | |
| 1230 | ics = kvmppc_xics_find_ics(xics, irq, &idx); |
| 1231 | if (!ics) { |
| 1232 | ics = kvmppc_xics_create_ics(xics->kvm, xics, irq); |
| 1233 | if (!ics) |
| 1234 | return -ENOMEM; |
| 1235 | } |
| 1236 | irqp = &ics->irq_state[idx]; |
| 1237 | if (get_user(val, ubufp)) |
| 1238 | return -EFAULT; |
| 1239 | |
| 1240 | server = val & KVM_XICS_DESTINATION_MASK; |
| 1241 | prio = val >> KVM_XICS_PRIORITY_SHIFT; |
| 1242 | if (prio != MASKED && |
| 1243 | kvmppc_xics_find_server(xics->kvm, server) == NULL) |
| 1244 | return -EINVAL; |
| 1245 | |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 1246 | local_irq_save(flags); |
| 1247 | arch_spin_lock(&ics->lock); |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1248 | irqp->server = server; |
| 1249 | irqp->saved_priority = prio; |
| 1250 | if (val & KVM_XICS_MASKED) |
| 1251 | prio = MASKED; |
| 1252 | irqp->priority = prio; |
| 1253 | irqp->resend = 0; |
| 1254 | irqp->masked_pending = 0; |
Paul Mackerras | b1a4286 | 2016-05-04 21:07:52 +1000 | [diff] [blame] | 1255 | irqp->lsi = 0; |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1256 | irqp->asserted = 0; |
Paul Mackerras | b1a4286 | 2016-05-04 21:07:52 +1000 | [diff] [blame] | 1257 | if (val & KVM_XICS_LEVEL_SENSITIVE) { |
| 1258 | irqp->lsi = 1; |
| 1259 | if (val & KVM_XICS_PENDING) |
| 1260 | irqp->asserted = 1; |
| 1261 | } |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1262 | irqp->exists = 1; |
Suresh Warrier | 34cb795 | 2015-03-20 20:39:46 +1100 | [diff] [blame] | 1263 | arch_spin_unlock(&ics->lock); |
| 1264 | local_irq_restore(flags); |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1265 | |
| 1266 | if (val & KVM_XICS_PENDING) |
| 1267 | icp_deliver_irq(xics, NULL, irqp->number); |
| 1268 | |
| 1269 | return 0; |
| 1270 | } |
| 1271 | |
| 1272 | int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level, |
| 1273 | bool line_status) |
| 1274 | { |
| 1275 | struct kvmppc_xics *xics = kvm->arch.xics; |
| 1276 | |
Paul Mackerras | e48ba1c | 2016-08-10 11:13:09 +1000 | [diff] [blame] | 1277 | if (!xics) |
| 1278 | return -ENODEV; |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 1279 | return ics_deliver_irq(xics, irq, level); |
| 1280 | } |
| 1281 | |
Paul Mackerras | b1a4286 | 2016-05-04 21:07:52 +1000 | [diff] [blame] | 1282 | int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *irq_entry, |
| 1283 | struct kvm *kvm, int irq_source_id, |
| 1284 | int level, bool line_status) |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 1285 | { |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 1286 | return kvm_set_irq(kvm, irq_source_id, irq_entry->gsi, |
| 1287 | level, line_status); |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1288 | } |
| 1289 | |
| 1290 | static int xics_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) |
| 1291 | { |
| 1292 | struct kvmppc_xics *xics = dev->private; |
| 1293 | |
| 1294 | switch (attr->group) { |
| 1295 | case KVM_DEV_XICS_GRP_SOURCES: |
| 1296 | return xics_set_source(xics, attr->attr, attr->addr); |
| 1297 | } |
| 1298 | return -ENXIO; |
| 1299 | } |
| 1300 | |
| 1301 | static int xics_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) |
| 1302 | { |
| 1303 | struct kvmppc_xics *xics = dev->private; |
| 1304 | |
| 1305 | switch (attr->group) { |
| 1306 | case KVM_DEV_XICS_GRP_SOURCES: |
| 1307 | return xics_get_source(xics, attr->attr, attr->addr); |
| 1308 | } |
| 1309 | return -ENXIO; |
| 1310 | } |
| 1311 | |
| 1312 | static int xics_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr) |
| 1313 | { |
| 1314 | switch (attr->group) { |
| 1315 | case KVM_DEV_XICS_GRP_SOURCES: |
| 1316 | if (attr->attr >= KVMPPC_XICS_FIRST_IRQ && |
| 1317 | attr->attr < KVMPPC_XICS_NR_IRQS) |
| 1318 | return 0; |
| 1319 | break; |
| 1320 | } |
| 1321 | return -ENXIO; |
| 1322 | } |
| 1323 | |
| 1324 | static void kvmppc_xics_free(struct kvm_device *dev) |
| 1325 | { |
| 1326 | struct kvmppc_xics *xics = dev->private; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1327 | int i; |
| 1328 | struct kvm *kvm = xics->kvm; |
| 1329 | |
| 1330 | debugfs_remove(xics->dentry); |
| 1331 | |
| 1332 | if (kvm) |
| 1333 | kvm->arch.xics = NULL; |
| 1334 | |
| 1335 | for (i = 0; i <= xics->max_icsid; i++) |
| 1336 | kfree(xics->ics[i]); |
| 1337 | kfree(xics); |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1338 | kfree(dev); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1339 | } |
| 1340 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1341 | static int kvmppc_xics_create(struct kvm_device *dev, u32 type) |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1342 | { |
| 1343 | struct kvmppc_xics *xics; |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1344 | struct kvm *kvm = dev->kvm; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1345 | int ret = 0; |
| 1346 | |
| 1347 | xics = kzalloc(sizeof(*xics), GFP_KERNEL); |
| 1348 | if (!xics) |
| 1349 | return -ENOMEM; |
| 1350 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1351 | dev->private = xics; |
| 1352 | xics->dev = dev; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1353 | xics->kvm = kvm; |
| 1354 | |
| 1355 | /* Already there ? */ |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1356 | if (kvm->arch.xics) |
| 1357 | ret = -EEXIST; |
| 1358 | else |
| 1359 | kvm->arch.xics = xics; |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1360 | |
Gleb Natapov | 458ff3c | 2013-09-01 15:53:46 +0300 | [diff] [blame] | 1361 | if (ret) { |
| 1362 | kfree(xics); |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1363 | return ret; |
Gleb Natapov | 458ff3c | 2013-09-01 15:53:46 +0300 | [diff] [blame] | 1364 | } |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1365 | |
Aneesh Kumar K.V | 3a167bea | 2013-10-07 22:17:53 +0530 | [diff] [blame] | 1366 | #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 1367 | if (cpu_has_feature(CPU_FTR_ARCH_206)) { |
| 1368 | /* Enable real mode support */ |
| 1369 | xics->real_mode = ENABLE_REALMODE; |
| 1370 | xics->real_mode_dbg = DEBUG_REALMODE; |
| 1371 | } |
Aneesh Kumar K.V | 3a167bea | 2013-10-07 22:17:53 +0530 | [diff] [blame] | 1372 | #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ |
Benjamin Herrenschmidt | e7d26f2 | 2013-04-17 20:31:15 +0000 | [diff] [blame] | 1373 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1374 | return 0; |
| 1375 | } |
| 1376 | |
Christoffer Dall | 023e9fd | 2016-08-09 19:13:00 +0200 | [diff] [blame] | 1377 | static void kvmppc_xics_init(struct kvm_device *dev) |
| 1378 | { |
| 1379 | struct kvmppc_xics *xics = (struct kvmppc_xics *)dev->private; |
| 1380 | |
| 1381 | xics_debugfs_init(xics); |
| 1382 | } |
| 1383 | |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1384 | struct kvm_device_ops kvm_xics_ops = { |
| 1385 | .name = "kvm-xics", |
| 1386 | .create = kvmppc_xics_create, |
Christoffer Dall | 023e9fd | 2016-08-09 19:13:00 +0200 | [diff] [blame] | 1387 | .init = kvmppc_xics_init, |
Paul Mackerras | 5975a2e | 2013-04-27 00:28:37 +0000 | [diff] [blame] | 1388 | .destroy = kvmppc_xics_free, |
| 1389 | .set_attr = xics_set_attr, |
| 1390 | .get_attr = xics_get_attr, |
| 1391 | .has_attr = xics_has_attr, |
| 1392 | }; |
| 1393 | |
| 1394 | int kvmppc_xics_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu, |
| 1395 | u32 xcpu) |
| 1396 | { |
| 1397 | struct kvmppc_xics *xics = dev->private; |
| 1398 | int r = -EBUSY; |
| 1399 | |
| 1400 | if (dev->ops != &kvm_xics_ops) |
| 1401 | return -EPERM; |
| 1402 | if (xics->kvm != vcpu->kvm) |
| 1403 | return -EPERM; |
| 1404 | if (vcpu->arch.irq_type) |
| 1405 | return -EBUSY; |
| 1406 | |
| 1407 | r = kvmppc_xics_create_icp(vcpu, xcpu); |
| 1408 | if (!r) |
| 1409 | vcpu->arch.irq_type = KVMPPC_IRQ_XICS; |
| 1410 | |
| 1411 | return r; |
| 1412 | } |
| 1413 | |
Benjamin Herrenschmidt | bc5ad3f | 2013-04-17 20:30:26 +0000 | [diff] [blame] | 1414 | void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu) |
| 1415 | { |
| 1416 | if (!vcpu->arch.icp) |
| 1417 | return; |
| 1418 | kfree(vcpu->arch.icp); |
| 1419 | vcpu->arch.icp = NULL; |
| 1420 | vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT; |
| 1421 | } |
Paul Mackerras | 25a2150b | 2014-06-30 20:51:14 +1000 | [diff] [blame] | 1422 | |
| 1423 | static int xics_set_irq(struct kvm_kernel_irq_routing_entry *e, |
| 1424 | struct kvm *kvm, int irq_source_id, int level, |
| 1425 | bool line_status) |
| 1426 | { |
| 1427 | return kvm_set_irq(kvm, irq_source_id, e->gsi, level, line_status); |
| 1428 | } |
| 1429 | |
| 1430 | int kvm_irq_map_gsi(struct kvm *kvm, |
| 1431 | struct kvm_kernel_irq_routing_entry *entries, int gsi) |
| 1432 | { |
| 1433 | entries->gsi = gsi; |
| 1434 | entries->type = KVM_IRQ_ROUTING_IRQCHIP; |
| 1435 | entries->set = xics_set_irq; |
| 1436 | entries->irqchip.irqchip = 0; |
| 1437 | entries->irqchip.pin = gsi; |
| 1438 | return 1; |
| 1439 | } |
| 1440 | |
| 1441 | int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin) |
| 1442 | { |
| 1443 | return pin; |
| 1444 | } |
Paul Mackerras | 5d37519 | 2016-08-19 15:35:56 +1000 | [diff] [blame] | 1445 | |
| 1446 | void kvmppc_xics_set_mapped(struct kvm *kvm, unsigned long irq, |
| 1447 | unsigned long host_irq) |
| 1448 | { |
| 1449 | struct kvmppc_xics *xics = kvm->arch.xics; |
| 1450 | struct kvmppc_ics *ics; |
| 1451 | u16 idx; |
| 1452 | |
| 1453 | ics = kvmppc_xics_find_ics(xics, irq, &idx); |
| 1454 | if (!ics) |
| 1455 | return; |
| 1456 | |
| 1457 | ics->irq_state[idx].host_irq = host_irq; |
| 1458 | ics->irq_state[idx].intr_cpu = -1; |
| 1459 | } |
| 1460 | EXPORT_SYMBOL_GPL(kvmppc_xics_set_mapped); |
| 1461 | |
| 1462 | void kvmppc_xics_clr_mapped(struct kvm *kvm, unsigned long irq, |
| 1463 | unsigned long host_irq) |
| 1464 | { |
| 1465 | struct kvmppc_xics *xics = kvm->arch.xics; |
| 1466 | struct kvmppc_ics *ics; |
| 1467 | u16 idx; |
| 1468 | |
| 1469 | ics = kvmppc_xics_find_ics(xics, irq, &idx); |
| 1470 | if (!ics) |
| 1471 | return; |
| 1472 | |
| 1473 | ics->irq_state[idx].host_irq = 0; |
| 1474 | } |
| 1475 | EXPORT_SYMBOL_GPL(kvmppc_xics_clr_mapped); |