2 * Copyright 2012 Michael Ellerman, IBM Corporation.
3 * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation.
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.
10 #include <linux/kernel.h>
11 #include <linux/kvm_host.h>
12 #include <linux/err.h>
13 #include <linux/gfp.h>
14 #include <linux/anon_inodes.h>
15 #include <linux/spinlock.h>
17 #include <asm/uaccess.h>
18 #include <asm/kvm_book3s.h>
19 #include <asm/kvm_ppc.h>
20 #include <asm/hvcall.h>
22 #include <asm/debug.h>
25 #include <linux/debugfs.h>
26 #include <linux/seq_file.h>
28 #include "book3s_xics.h"
31 #define XICS_DBG(fmt...) do { } while (0)
33 #define XICS_DBG(fmt...) trace_printk(fmt)
36 #define ENABLE_REALMODE true
37 #define DEBUG_REALMODE false
43 * Each ICS has a spin lock protecting the information about the IRQ
44 * sources and avoiding simultaneous deliveries of the same interrupt.
46 * ICP operations are done via a single compare & swap transaction
47 * (most ICP state fits in the union kvmppc_icp_state)
54 * - To speed up resends, keep a bitmap of "resend" set bits in the
57 * - Speed up server# -> ICP lookup (array ? hash table ?)
59 * - Make ICS lockless as well, or at least a per-interrupt lock or hashed
60 * locks array to improve scalability
63 /* -- ICS routines -- */
65 static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
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),
73 static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level)
75 struct ics_irq_state *state;
76 struct kvmppc_ics *ics;
79 XICS_DBG("ics deliver %#x (level: %d)\n", irq, level);
81 ics = kvmppc_xics_find_ics(xics, irq, &src);
83 XICS_DBG("ics_deliver_irq: IRQ 0x%06x not found !\n", irq);
86 state = &ics->irq_state[src];
91 * We set state->asserted locklessly. This should be fine as
92 * we are the only setter, thus concurrent access is undefined
95 if ((level == 1 && state->lsi) || level == KVM_INTERRUPT_SET_LEVEL)
97 else if (level == 0 || level == KVM_INTERRUPT_UNSET) {
102 /* Record which CPU this arrived on for passed-through interrupts */
104 state->intr_cpu = raw_smp_processor_id();
106 /* Attempt delivery */
107 icp_deliver_irq(xics, NULL, irq);
112 static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
113 struct kvmppc_icp *icp)
119 local_irq_save(flags);
120 arch_spin_lock(&ics->lock);
122 for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
123 struct ics_irq_state *state = &ics->irq_state[i];
128 XICS_DBG("resend %#x prio %#x\n", state->number,
131 arch_spin_unlock(&ics->lock);
132 local_irq_restore(flags);
133 icp_deliver_irq(xics, icp, state->number);
134 local_irq_save(flags);
135 arch_spin_lock(&ics->lock);
138 arch_spin_unlock(&ics->lock);
139 local_irq_restore(flags);
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)
149 local_irq_save(flags);
150 arch_spin_lock(&ics->lock);
152 state->server = server;
153 state->priority = priority;
154 state->saved_priority = saved_priority;
156 if ((state->masked_pending || state->resend) && priority != MASKED) {
157 state->masked_pending = 0;
161 arch_spin_unlock(&ics->lock);
162 local_irq_restore(flags);
167 int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
169 struct kvmppc_xics *xics = kvm->arch.xics;
170 struct kvmppc_icp *icp;
171 struct kvmppc_ics *ics;
172 struct ics_irq_state *state;
178 ics = kvmppc_xics_find_ics(xics, irq, &src);
181 state = &ics->irq_state[src];
183 icp = kvmppc_xics_find_server(kvm, server);
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);
191 if (write_xive(xics, ics, state, server, priority, priority))
192 icp_deliver_irq(xics, icp, irq);
197 int kvmppc_xics_get_xive(struct kvm *kvm, u32 irq, u32 *server, u32 *priority)
199 struct kvmppc_xics *xics = kvm->arch.xics;
200 struct kvmppc_ics *ics;
201 struct ics_irq_state *state;
208 ics = kvmppc_xics_find_ics(xics, irq, &src);
211 state = &ics->irq_state[src];
213 local_irq_save(flags);
214 arch_spin_lock(&ics->lock);
215 *server = state->server;
216 *priority = state->priority;
217 arch_spin_unlock(&ics->lock);
218 local_irq_restore(flags);
223 int kvmppc_xics_int_on(struct kvm *kvm, u32 irq)
225 struct kvmppc_xics *xics = kvm->arch.xics;
226 struct kvmppc_icp *icp;
227 struct kvmppc_ics *ics;
228 struct ics_irq_state *state;
234 ics = kvmppc_xics_find_ics(xics, irq, &src);
237 state = &ics->irq_state[src];
239 icp = kvmppc_xics_find_server(kvm, state->server);
243 if (write_xive(xics, ics, state, state->server, state->saved_priority,
244 state->saved_priority))
245 icp_deliver_irq(xics, icp, irq);
250 int kvmppc_xics_int_off(struct kvm *kvm, u32 irq)
252 struct kvmppc_xics *xics = kvm->arch.xics;
253 struct kvmppc_ics *ics;
254 struct ics_irq_state *state;
260 ics = kvmppc_xics_find_ics(xics, irq, &src);
263 state = &ics->irq_state[src];
265 write_xive(xics, ics, state, state->server, MASKED, state->priority);
270 /* -- ICP routines, including hcalls -- */
272 static inline bool icp_try_update(struct kvmppc_icp *icp,
273 union kvmppc_icp_state old,
274 union kvmppc_icp_state new,
279 /* Calculate new output value */
280 new.out_ee = (new.xisr && (new.pending_pri < new.cppr));
282 /* Attempt atomic update */
283 success = cmpxchg64(&icp->state.raw, old.raw, new.raw) == old.raw;
287 XICS_DBG("UPD [%04lx] - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n",
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);
295 * Check for output state update
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).
303 * We also do not try to figure out whether the EE state has changed,
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.
310 kvmppc_book3s_queue_irqprio(icp->vcpu,
311 BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
313 kvmppc_fast_vcpu_kick(icp->vcpu);
319 static void icp_check_resend(struct kvmppc_xics *xics,
320 struct kvmppc_icp *icp)
324 /* Order this load with the test for need_resend in the caller */
326 for_each_set_bit(icsid, icp->resend_map, xics->max_icsid + 1) {
327 struct kvmppc_ics *ics = xics->ics[icsid];
329 if (!test_and_clear_bit(icsid, icp->resend_map))
333 ics_check_resend(xics, ics, icp);
337 static bool icp_try_to_deliver(struct kvmppc_icp *icp, u32 irq, u8 priority,
340 union kvmppc_icp_state old_state, new_state;
343 XICS_DBG("try deliver %#x(P:%#x) to server %#lx\n", irq, priority,
347 old_state = new_state = READ_ONCE(icp->state);
351 /* See if we can deliver */
352 success = new_state.cppr > priority &&
353 new_state.mfrr > priority &&
354 new_state.pending_pri > priority;
357 * If we can, check for a rejection and perform the
361 *reject = new_state.xisr;
362 new_state.xisr = irq;
363 new_state.pending_pri = priority;
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.
370 new_state.need_resend = true;
373 } while (!icp_try_update(icp, old_state, new_state, false));
378 static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
381 struct ics_irq_state *state;
382 struct kvmppc_ics *ics;
388 * This is used both for initial delivery of an interrupt and
389 * for subsequent rejection.
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.
395 * So we need to retry the delivery. Essentially the reject path
396 * boils down to a failed delivery. Always.
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
403 /* Get the ICS state and lock it */
404 ics = kvmppc_xics_find_ics(xics, new_irq, &src);
406 XICS_DBG("icp_deliver_irq: IRQ 0x%06x not found !\n", new_irq);
409 state = &ics->irq_state[src];
411 /* Get a lock on the ICS */
412 local_irq_save(flags);
413 arch_spin_lock(&ics->lock);
416 if (!icp || state->server != icp->server_num) {
417 icp = kvmppc_xics_find_server(xics->kvm, state->server);
419 pr_warn("icp_deliver_irq: IRQ 0x%06x server 0x%x not found !\n",
420 new_irq, state->server);
425 /* Clear the resend bit of that interrupt */
429 * If masked, bail out
431 * Note: PAPR doesn't mention anything about masked pending
432 * when doing a resend, only when doing a delivery.
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.
439 * I don't differentiate normal deliveries and resends, this
440 * implementation will differ from PAPR and not lose such
443 if (state->priority == MASKED) {
444 XICS_DBG("irq %#x masked pending\n", new_irq);
445 state->masked_pending = 1;
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.
454 * Note that if successful, the new delivery might have itself
455 * rejected an interrupt that was "delivered" before we took the
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.
465 if (icp_try_to_deliver(icp, new_irq, state->priority, &reject)) {
467 * Delivery was successful, did we reject somebody else ?
469 if (reject && reject != XICS_IPI) {
470 arch_spin_unlock(&ics->lock);
471 local_irq_restore(flags);
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
480 set_bit(ics->icsid, icp->resend_map);
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
490 if (!icp->state.need_resend) {
491 arch_spin_unlock(&ics->lock);
492 local_irq_restore(flags);
497 arch_spin_unlock(&ics->lock);
498 local_irq_restore(flags);
501 static void icp_down_cppr(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
504 union kvmppc_icp_state old_state, new_state;
508 * This handles several related states in one operation:
510 * ICP State: Down_CPPR
512 * Load CPPR with new value and if the XISR is 0
513 * then check for resends:
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
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
530 * Thus we don't have to handle rejects, only resends.
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
537 old_state = new_state = READ_ONCE(icp->state);
540 new_state.cppr = new_cppr;
543 * Cut down Resend / Check_IPI / IPI
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
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;
559 /* Latch/clear resend bit */
560 resend = new_state.need_resend;
561 new_state.need_resend = 0;
563 } while (!icp_try_update(icp, old_state, new_state, true));
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
571 icp_check_resend(xics, icp);
574 static noinline unsigned long kvmppc_h_xirr(struct kvm_vcpu *vcpu)
576 union kvmppc_icp_state old_state, new_state;
577 struct kvmppc_icp *icp = vcpu->arch.icp;
580 /* First, remove EE from the processor */
581 kvmppc_book3s_dequeue_irqprio(icp->vcpu,
582 BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
585 * ICP State: Accept_Interrupt
587 * Return the pending interrupt (if any) along with the
588 * current CPPR, then clear the XISR & set CPPR to the
592 old_state = new_state = READ_ONCE(icp->state);
594 xirr = old_state.xisr | (((u32)old_state.cppr) << 24);
597 new_state.cppr = new_state.pending_pri;
598 new_state.pending_pri = 0xff;
601 } while (!icp_try_update(icp, old_state, new_state, true));
603 XICS_DBG("h_xirr vcpu %d xirr %#x\n", vcpu->vcpu_id, xirr);
608 static noinline int kvmppc_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
611 union kvmppc_icp_state old_state, new_state;
612 struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
613 struct kvmppc_icp *icp;
618 XICS_DBG("h_ipi vcpu %d to server %lu mfrr %#lx\n",
619 vcpu->vcpu_id, server, mfrr);
621 icp = vcpu->arch.icp;
622 local = icp->server_num == server;
624 icp = kvmppc_xics_find_server(vcpu->kvm, server);
630 * ICP state: Set_MFRR
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
638 * ICP state: Check_IPI
640 * If the CPPR is less favored, then we might be replacing
641 * an interrupt, and thus need to possibly reject it.
645 * Besides rejecting any pending interrupts, we also
646 * update XISR and pending_pri to mark IPI as pending.
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.
659 old_state = new_state = READ_ONCE(icp->state);
662 new_state.mfrr = mfrr;
667 if (mfrr < new_state.cppr) {
668 /* Reject a pending interrupt if not an IPI */
669 if (mfrr <= new_state.pending_pri) {
670 reject = new_state.xisr;
671 new_state.pending_pri = mfrr;
672 new_state.xisr = XICS_IPI;
676 if (mfrr > old_state.mfrr) {
677 resend = new_state.need_resend;
678 new_state.need_resend = 0;
680 } while (!icp_try_update(icp, old_state, new_state, local));
683 if (reject && reject != XICS_IPI)
684 icp_deliver_irq(xics, icp, reject);
688 icp_check_resend(xics, icp);
693 static int kvmppc_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server)
695 union kvmppc_icp_state state;
696 struct kvmppc_icp *icp;
698 icp = vcpu->arch.icp;
699 if (icp->server_num != server) {
700 icp = kvmppc_xics_find_server(vcpu->kvm, server);
704 state = READ_ONCE(icp->state);
705 kvmppc_set_gpr(vcpu, 4, ((u32)state.cppr << 24) | state.xisr);
706 kvmppc_set_gpr(vcpu, 5, state.mfrr);
710 static noinline void kvmppc_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr)
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;
717 XICS_DBG("h_cppr vcpu %d cppr %#lx\n", vcpu->vcpu_id, cppr);
720 * ICP State: Set_CPPR
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
726 if (cppr > icp->state.cppr)
727 icp_down_cppr(xics, icp, cppr);
728 else if (cppr == icp->state.cppr)
734 * The processor is raising its priority, this can result
735 * in a rejection of a pending interrupt:
737 * ICP State: Reject_Current
739 * We can remove EE from the current processor, the update
740 * transaction will set it again if needed
742 kvmppc_book3s_dequeue_irqprio(icp->vcpu,
743 BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
746 old_state = new_state = READ_ONCE(icp->state);
749 new_state.cppr = cppr;
751 if (cppr <= new_state.pending_pri) {
752 reject = new_state.xisr;
754 new_state.pending_pri = 0xff;
757 } while (!icp_try_update(icp, old_state, new_state, true));
760 * Check for rejects. They are handled by doing a new delivery
761 * attempt (see comments in icp_deliver_irq).
763 if (reject && reject != XICS_IPI)
764 icp_deliver_irq(xics, icp, reject);
767 static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
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;
776 XICS_DBG("h_eoi vcpu %d eoi %#lx\n", vcpu->vcpu_id, xirr);
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.
786 * The sending of an EOI to the ICS is handled after the
789 * ICP State: Down_CPPR which we handle
790 * in a separate function as it's shared with H_CPPR.
792 icp_down_cppr(xics, icp, xirr >> 24);
794 /* IPIs have no EOI */
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.
801 * "Message" interrupts will never have "asserted" set
803 ics = kvmppc_xics_find_ics(xics, irq, &src);
805 XICS_DBG("h_eoi: IRQ 0x%06x not found !\n", irq);
808 state = &ics->irq_state[src];
810 /* Still asserted, resend it */
812 icp_deliver_irq(xics, icp, irq);
814 kvm_notify_acked_irq(vcpu->kvm, 0, irq);
819 int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
821 struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
822 struct kvmppc_icp *icp = vcpu->arch.icp;
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);
827 if (icp->rm_action & XICS_RM_KICK_VCPU) {
828 icp->n_rm_kick_vcpu++;
829 kvmppc_fast_vcpu_kick(icp->rm_kick_target);
831 if (icp->rm_action & XICS_RM_CHECK_RESEND) {
832 icp->n_rm_check_resend++;
833 icp_check_resend(xics, icp->rm_resend_icp);
835 if (icp->rm_action & XICS_RM_REJECT) {
837 icp_deliver_irq(xics, icp, icp->rm_reject);
839 if (icp->rm_action & XICS_RM_NOTIFY_EOI) {
840 icp->n_rm_notify_eoi++;
841 kvm_notify_acked_irq(vcpu->kvm, 0, icp->rm_eoied_irq);
848 EXPORT_SYMBOL_GPL(kvmppc_xics_rm_complete);
850 int kvmppc_xics_hcall(struct kvm_vcpu *vcpu, u32 req)
852 struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
856 /* Check if we have an ICP */
857 if (!xics || !vcpu->arch.icp)
860 /* These requests don't have real-mode implementations at present */
863 res = kvmppc_h_xirr(vcpu);
864 kvmppc_set_gpr(vcpu, 4, res);
865 kvmppc_set_gpr(vcpu, 5, get_tb());
868 rc = kvmppc_h_ipoll(vcpu, kvmppc_get_gpr(vcpu, 4));
872 /* Check for real mode returning too hard */
873 if (xics->real_mode && is_kvmppc_hv_enabled(vcpu->kvm))
874 return kvmppc_xics_rm_complete(vcpu, req);
878 res = kvmppc_h_xirr(vcpu);
879 kvmppc_set_gpr(vcpu, 4, res);
882 kvmppc_h_cppr(vcpu, kvmppc_get_gpr(vcpu, 4));
885 rc = kvmppc_h_eoi(vcpu, kvmppc_get_gpr(vcpu, 4));
888 rc = kvmppc_h_ipi(vcpu, kvmppc_get_gpr(vcpu, 4),
889 kvmppc_get_gpr(vcpu, 5));
895 EXPORT_SYMBOL_GPL(kvmppc_xics_hcall);
898 /* -- Initialisation code etc. -- */
900 static void xics_debugfs_irqmap(struct seq_file *m,
901 struct kvmppc_passthru_irqmap *pimap)
907 seq_printf(m, "========\nPIRQ mappings: %d maps\n===========\n",
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);
915 static int xics_debug_show(struct seq_file *m, void *private)
917 struct kvmppc_xics *xics = m->private;
918 struct kvm *kvm = xics->kvm;
919 struct kvm_vcpu *vcpu;
922 unsigned long t_rm_kick_vcpu, t_rm_check_resend;
923 unsigned long t_rm_reject, t_rm_notify_eoi;
924 unsigned long t_reject, t_check_resend;
931 t_rm_check_resend = 0;
936 xics_debugfs_irqmap(m, kvm->arch.pimap);
938 seq_printf(m, "=========\nICP state\n=========\n");
940 kvm_for_each_vcpu(i, vcpu, kvm) {
941 struct kvmppc_icp *icp = vcpu->arch.icp;
942 union kvmppc_icp_state state;
947 state.raw = READ_ONCE(icp->state.raw);
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);
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;
956 t_check_resend += icp->n_check_resend;
957 t_reject += icp->n_reject;
960 seq_printf(m, "ICP Guest->Host totals: kick_vcpu=%lu check_resend=%lu reject=%lu notify_eoi=%lu\n",
961 t_rm_kick_vcpu, t_rm_check_resend,
962 t_rm_reject, t_rm_notify_eoi);
963 seq_printf(m, "ICP Real Mode totals: check_resend=%lu resend=%lu\n",
964 t_check_resend, t_reject);
965 for (icsid = 0; icsid <= KVMPPC_XICS_MAX_ICS_ID; icsid++) {
966 struct kvmppc_ics *ics = xics->ics[icsid];
971 seq_printf(m, "=========\nICS state for ICS 0x%x\n=========\n",
974 local_irq_save(flags);
975 arch_spin_lock(&ics->lock);
977 for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
978 struct ics_irq_state *irq = &ics->irq_state[i];
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);
986 arch_spin_unlock(&ics->lock);
987 local_irq_restore(flags);
992 static int xics_debug_open(struct inode *inode, struct file *file)
994 return single_open(file, xics_debug_show, inode->i_private);
997 static const struct file_operations xics_debug_fops = {
998 .open = xics_debug_open,
1000 .llseek = seq_lseek,
1001 .release = single_release,
1004 static void xics_debugfs_init(struct kvmppc_xics *xics)
1008 name = kasprintf(GFP_KERNEL, "kvm-xics-%p", xics);
1010 pr_err("%s: no memory for name\n", __func__);
1014 xics->dentry = debugfs_create_file(name, S_IRUGO, powerpc_debugfs_root,
1015 xics, &xics_debug_fops);
1017 pr_debug("%s: created %s\n", __func__, name);
1021 static struct kvmppc_ics *kvmppc_xics_create_ics(struct kvm *kvm,
1022 struct kvmppc_xics *xics, int irq)
1024 struct kvmppc_ics *ics;
1027 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
1029 mutex_lock(&kvm->lock);
1031 /* ICS already exists - somebody else got here first */
1032 if (xics->ics[icsid])
1035 /* Create the ICS */
1036 ics = kzalloc(sizeof(struct kvmppc_ics), GFP_KERNEL);
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;
1048 xics->ics[icsid] = ics;
1050 if (icsid > xics->max_icsid)
1051 xics->max_icsid = icsid;
1054 mutex_unlock(&kvm->lock);
1055 return xics->ics[icsid];
1058 int kvmppc_xics_create_icp(struct kvm_vcpu *vcpu, unsigned long server_num)
1060 struct kvmppc_icp *icp;
1062 if (!vcpu->kvm->arch.xics)
1065 if (kvmppc_xics_find_server(vcpu->kvm, server_num))
1068 icp = kzalloc(sizeof(struct kvmppc_icp), GFP_KERNEL);
1073 icp->server_num = server_num;
1074 icp->state.mfrr = MASKED;
1075 icp->state.pending_pri = MASKED;
1076 vcpu->arch.icp = icp;
1078 XICS_DBG("created server for vcpu %d\n", vcpu->vcpu_id);
1083 u64 kvmppc_xics_get_icp(struct kvm_vcpu *vcpu)
1085 struct kvmppc_icp *icp = vcpu->arch.icp;
1086 union kvmppc_icp_state 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);
1097 int kvmppc_xics_set_icp(struct kvm_vcpu *vcpu, u64 icpval)
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;
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;
1117 /* Require the new state to be internally consistent */
1119 if (pending_pri != 0xff)
1121 } else if (xisr == XICS_IPI) {
1122 if (pending_pri != mfrr || pending_pri >= cppr)
1125 if (pending_pri >= mfrr || pending_pri >= cppr)
1127 ics = kvmppc_xics_find_ics(xics, xisr, &src);
1133 new_state.cppr = cppr;
1134 new_state.xisr = xisr;
1135 new_state.mfrr = mfrr;
1136 new_state.pending_pri = pending_pri;
1139 * Deassert the CPU interrupt request.
1140 * icp_try_update will reassert it if necessary.
1142 kvmppc_book3s_dequeue_irqprio(icp->vcpu,
1143 BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
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.
1156 old_state = READ_ONCE(icp->state);
1158 if (new_state.mfrr <= old_state.mfrr) {
1160 new_state.need_resend = old_state.need_resend;
1162 resend = old_state.need_resend;
1163 new_state.need_resend = 0;
1165 } while (!icp_try_update(icp, old_state, new_state, false));
1168 icp_check_resend(xics, icp);
1173 static int xics_get_source(struct kvmppc_xics *xics, long irq, u64 addr)
1176 struct kvmppc_ics *ics;
1177 struct ics_irq_state *irqp;
1178 u64 __user *ubufp = (u64 __user *) addr;
1181 unsigned long flags;
1183 ics = kvmppc_xics_find_ics(xics, irq, &idx);
1187 irqp = &ics->irq_state[idx];
1188 local_irq_save(flags);
1189 arch_spin_lock(&ics->lock);
1193 prio = irqp->priority;
1194 if (prio == MASKED) {
1195 val |= KVM_XICS_MASKED;
1196 prio = irqp->saved_priority;
1198 val |= prio << KVM_XICS_PRIORITY_SHIFT;
1200 val |= KVM_XICS_LEVEL_SENSITIVE;
1202 val |= KVM_XICS_PENDING;
1203 } else if (irqp->masked_pending || irqp->resend)
1204 val |= KVM_XICS_PENDING;
1207 arch_spin_unlock(&ics->lock);
1208 local_irq_restore(flags);
1210 if (!ret && put_user(val, ubufp))
1216 static int xics_set_source(struct kvmppc_xics *xics, long irq, u64 addr)
1218 struct kvmppc_ics *ics;
1219 struct ics_irq_state *irqp;
1220 u64 __user *ubufp = (u64 __user *) addr;
1225 unsigned long flags;
1227 if (irq < KVMPPC_XICS_FIRST_IRQ || irq >= KVMPPC_XICS_NR_IRQS)
1230 ics = kvmppc_xics_find_ics(xics, irq, &idx);
1232 ics = kvmppc_xics_create_ics(xics->kvm, xics, irq);
1236 irqp = &ics->irq_state[idx];
1237 if (get_user(val, ubufp))
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)
1246 local_irq_save(flags);
1247 arch_spin_lock(&ics->lock);
1248 irqp->server = server;
1249 irqp->saved_priority = prio;
1250 if (val & KVM_XICS_MASKED)
1252 irqp->priority = prio;
1254 irqp->masked_pending = 0;
1257 if (val & KVM_XICS_LEVEL_SENSITIVE) {
1259 if (val & KVM_XICS_PENDING)
1263 arch_spin_unlock(&ics->lock);
1264 local_irq_restore(flags);
1266 if (val & KVM_XICS_PENDING)
1267 icp_deliver_irq(xics, NULL, irqp->number);
1272 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
1275 struct kvmppc_xics *xics = kvm->arch.xics;
1279 return ics_deliver_irq(xics, irq, level);
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)
1286 return kvm_set_irq(kvm, irq_source_id, irq_entry->gsi,
1287 level, line_status);
1290 static int xics_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1292 struct kvmppc_xics *xics = dev->private;
1294 switch (attr->group) {
1295 case KVM_DEV_XICS_GRP_SOURCES:
1296 return xics_set_source(xics, attr->attr, attr->addr);
1301 static int xics_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1303 struct kvmppc_xics *xics = dev->private;
1305 switch (attr->group) {
1306 case KVM_DEV_XICS_GRP_SOURCES:
1307 return xics_get_source(xics, attr->attr, attr->addr);
1312 static int xics_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
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)
1324 static void kvmppc_xics_free(struct kvm_device *dev)
1326 struct kvmppc_xics *xics = dev->private;
1328 struct kvm *kvm = xics->kvm;
1330 debugfs_remove(xics->dentry);
1333 kvm->arch.xics = NULL;
1335 for (i = 0; i <= xics->max_icsid; i++)
1336 kfree(xics->ics[i]);
1341 static int kvmppc_xics_create(struct kvm_device *dev, u32 type)
1343 struct kvmppc_xics *xics;
1344 struct kvm *kvm = dev->kvm;
1347 xics = kzalloc(sizeof(*xics), GFP_KERNEL);
1351 dev->private = xics;
1355 /* Already there ? */
1359 kvm->arch.xics = xics;
1366 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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;
1372 #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
1377 static void kvmppc_xics_init(struct kvm_device *dev)
1379 struct kvmppc_xics *xics = (struct kvmppc_xics *)dev->private;
1381 xics_debugfs_init(xics);
1384 struct kvm_device_ops kvm_xics_ops = {
1386 .create = kvmppc_xics_create,
1387 .init = kvmppc_xics_init,
1388 .destroy = kvmppc_xics_free,
1389 .set_attr = xics_set_attr,
1390 .get_attr = xics_get_attr,
1391 .has_attr = xics_has_attr,
1394 int kvmppc_xics_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
1397 struct kvmppc_xics *xics = dev->private;
1400 if (dev->ops != &kvm_xics_ops)
1402 if (xics->kvm != vcpu->kvm)
1404 if (vcpu->arch.irq_type)
1407 r = kvmppc_xics_create_icp(vcpu, xcpu);
1409 vcpu->arch.irq_type = KVMPPC_IRQ_XICS;
1414 void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu)
1416 if (!vcpu->arch.icp)
1418 kfree(vcpu->arch.icp);
1419 vcpu->arch.icp = NULL;
1420 vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT;
1423 static int xics_set_irq(struct kvm_kernel_irq_routing_entry *e,
1424 struct kvm *kvm, int irq_source_id, int level,
1427 return kvm_set_irq(kvm, irq_source_id, e->gsi, level, line_status);
1430 int kvm_irq_map_gsi(struct kvm *kvm,
1431 struct kvm_kernel_irq_routing_entry *entries, int gsi)
1434 entries->type = KVM_IRQ_ROUTING_IRQCHIP;
1435 entries->set = xics_set_irq;
1436 entries->irqchip.irqchip = 0;
1437 entries->irqchip.pin = gsi;
1441 int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
1446 void kvmppc_xics_set_mapped(struct kvm *kvm, unsigned long irq,
1447 unsigned long host_irq)
1449 struct kvmppc_xics *xics = kvm->arch.xics;
1450 struct kvmppc_ics *ics;
1453 ics = kvmppc_xics_find_ics(xics, irq, &idx);
1457 ics->irq_state[idx].host_irq = host_irq;
1458 ics->irq_state[idx].intr_cpu = -1;
1460 EXPORT_SYMBOL_GPL(kvmppc_xics_set_mapped);
1462 void kvmppc_xics_clr_mapped(struct kvm *kvm, unsigned long irq,
1463 unsigned long host_irq)
1465 struct kvmppc_xics *xics = kvm->arch.xics;
1466 struct kvmppc_ics *ics;
1469 ics = kvmppc_xics_find_ics(xics, irq, &idx);
1473 ics->irq_state[idx].host_irq = 0;
1475 EXPORT_SYMBOL_GPL(kvmppc_xics_clr_mapped);