2013-04-17 20:30:26 +00:00
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/*
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* Copyright 2012 Michael Ellerman, IBM Corporation.
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* Copyright 2012 Benjamin Herrenschmidt, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/kvm_host.h>
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#include <linux/err.h>
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#include <linux/gfp.h>
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#include <asm/uaccess.h>
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#include <asm/kvm_book3s.h>
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#include <asm/kvm_ppc.h>
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#include <asm/hvcall.h>
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#include <asm/xics.h>
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#include <asm/debug.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include "book3s_xics.h"
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#if 1
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#define XICS_DBG(fmt...) do { } while (0)
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#else
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#define XICS_DBG(fmt...) trace_printk(fmt)
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#endif
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2013-04-17 20:31:15 +00:00
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#define ENABLE_REALMODE true
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#define DEBUG_REALMODE false
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2013-04-17 20:30:26 +00:00
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/*
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* LOCKING
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* =======
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*
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* Each ICS has a mutex protecting the information about the IRQ
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* sources and avoiding simultaneous deliveries if the same interrupt.
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*
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* ICP operations are done via a single compare & swap transaction
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* (most ICP state fits in the union kvmppc_icp_state)
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*/
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/*
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* TODO
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* ====
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*
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* - To speed up resends, keep a bitmap of "resend" set bits in the
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* ICS
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*
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* - Speed up server# -> ICP lookup (array ? hash table ?)
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*
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* - Make ICS lockless as well, or at least a per-interrupt lock or hashed
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* locks array to improve scalability
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*
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* - ioctl's to save/restore the entire state for snapshot & migration
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*/
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/* -- ICS routines -- */
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static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
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u32 new_irq);
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static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level)
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{
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struct ics_irq_state *state;
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struct kvmppc_ics *ics;
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u16 src;
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XICS_DBG("ics deliver %#x (level: %d)\n", irq, level);
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ics = kvmppc_xics_find_ics(xics, irq, &src);
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if (!ics) {
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XICS_DBG("ics_deliver_irq: IRQ 0x%06x not found !\n", irq);
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return -EINVAL;
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}
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state = &ics->irq_state[src];
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if (!state->exists)
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return -EINVAL;
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/*
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* We set state->asserted locklessly. This should be fine as
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* we are the only setter, thus concurrent access is undefined
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* to begin with.
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*/
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if (level == KVM_INTERRUPT_SET_LEVEL)
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state->asserted = 1;
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else if (level == KVM_INTERRUPT_UNSET) {
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state->asserted = 0;
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return 0;
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}
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/* Attempt delivery */
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icp_deliver_irq(xics, NULL, irq);
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return 0;
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}
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static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
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struct kvmppc_icp *icp)
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{
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int i;
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mutex_lock(&ics->lock);
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for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
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struct ics_irq_state *state = &ics->irq_state[i];
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if (!state->resend)
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continue;
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XICS_DBG("resend %#x prio %#x\n", state->number,
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state->priority);
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mutex_unlock(&ics->lock);
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icp_deliver_irq(xics, icp, state->number);
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mutex_lock(&ics->lock);
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}
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mutex_unlock(&ics->lock);
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}
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int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
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{
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struct kvmppc_xics *xics = kvm->arch.xics;
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struct kvmppc_icp *icp;
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struct kvmppc_ics *ics;
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struct ics_irq_state *state;
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u16 src;
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bool deliver;
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if (!xics)
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return -ENODEV;
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ics = kvmppc_xics_find_ics(xics, irq, &src);
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if (!ics)
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return -EINVAL;
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state = &ics->irq_state[src];
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icp = kvmppc_xics_find_server(kvm, server);
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if (!icp)
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return -EINVAL;
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mutex_lock(&ics->lock);
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XICS_DBG("set_xive %#x server %#x prio %#x MP:%d RS:%d\n",
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irq, server, priority,
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state->masked_pending, state->resend);
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state->server = server;
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state->priority = priority;
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deliver = false;
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if ((state->masked_pending || state->resend) && priority != MASKED) {
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state->masked_pending = 0;
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deliver = true;
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}
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mutex_unlock(&ics->lock);
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if (deliver)
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icp_deliver_irq(xics, icp, irq);
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return 0;
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}
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int kvmppc_xics_get_xive(struct kvm *kvm, u32 irq, u32 *server, u32 *priority)
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{
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struct kvmppc_xics *xics = kvm->arch.xics;
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struct kvmppc_ics *ics;
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struct ics_irq_state *state;
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u16 src;
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if (!xics)
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return -ENODEV;
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ics = kvmppc_xics_find_ics(xics, irq, &src);
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if (!ics)
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return -EINVAL;
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state = &ics->irq_state[src];
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mutex_lock(&ics->lock);
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*server = state->server;
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*priority = state->priority;
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mutex_unlock(&ics->lock);
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return 0;
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}
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/* -- ICP routines, including hcalls -- */
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static inline bool icp_try_update(struct kvmppc_icp *icp,
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union kvmppc_icp_state old,
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union kvmppc_icp_state new,
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bool change_self)
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{
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bool success;
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/* Calculate new output value */
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new.out_ee = (new.xisr && (new.pending_pri < new.cppr));
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/* Attempt atomic update */
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success = cmpxchg64(&icp->state.raw, old.raw, new.raw) == old.raw;
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if (!success)
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goto bail;
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XICS_DBG("UPD [%04x] - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n",
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icp->server_num,
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old.cppr, old.mfrr, old.pending_pri, old.xisr,
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old.need_resend, old.out_ee);
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XICS_DBG("UPD - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n",
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new.cppr, new.mfrr, new.pending_pri, new.xisr,
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new.need_resend, new.out_ee);
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/*
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* Check for output state update
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*
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* Note that this is racy since another processor could be updating
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* the state already. This is why we never clear the interrupt output
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* here, we only ever set it. The clear only happens prior to doing
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* an update and only by the processor itself. Currently we do it
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* in Accept (H_XIRR) and Up_Cppr (H_XPPR).
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*
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* We also do not try to figure out whether the EE state has changed,
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2013-04-17 20:31:15 +00:00
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* we unconditionally set it if the new state calls for it. The reason
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* for that is that we opportunistically remove the pending interrupt
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* flag when raising CPPR, so we need to set it back here if an
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* interrupt is still pending.
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2013-04-17 20:30:26 +00:00
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*/
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if (new.out_ee) {
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kvmppc_book3s_queue_irqprio(icp->vcpu,
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BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
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if (!change_self)
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2013-04-17 20:30:50 +00:00
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kvmppc_fast_vcpu_kick(icp->vcpu);
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2013-04-17 20:30:26 +00:00
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}
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bail:
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return success;
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}
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static void icp_check_resend(struct kvmppc_xics *xics,
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struct kvmppc_icp *icp)
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{
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u32 icsid;
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/* Order this load with the test for need_resend in the caller */
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smp_rmb();
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for_each_set_bit(icsid, icp->resend_map, xics->max_icsid + 1) {
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struct kvmppc_ics *ics = xics->ics[icsid];
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if (!test_and_clear_bit(icsid, icp->resend_map))
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continue;
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if (!ics)
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continue;
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ics_check_resend(xics, ics, icp);
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}
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}
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static bool icp_try_to_deliver(struct kvmppc_icp *icp, u32 irq, u8 priority,
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u32 *reject)
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{
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union kvmppc_icp_state old_state, new_state;
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bool success;
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XICS_DBG("try deliver %#x(P:%#x) to server %#x\n", irq, priority,
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icp->server_num);
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do {
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old_state = new_state = ACCESS_ONCE(icp->state);
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*reject = 0;
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/* See if we can deliver */
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success = new_state.cppr > priority &&
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new_state.mfrr > priority &&
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new_state.pending_pri > priority;
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/*
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* If we can, check for a rejection and perform the
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* delivery
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*/
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if (success) {
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*reject = new_state.xisr;
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new_state.xisr = irq;
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new_state.pending_pri = priority;
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} else {
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/*
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* If we failed to deliver we set need_resend
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* so a subsequent CPPR state change causes us
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* to try a new delivery.
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*/
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new_state.need_resend = true;
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}
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} while (!icp_try_update(icp, old_state, new_state, false));
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return success;
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}
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static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
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u32 new_irq)
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{
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struct ics_irq_state *state;
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struct kvmppc_ics *ics;
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u32 reject;
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u16 src;
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/*
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* This is used both for initial delivery of an interrupt and
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* for subsequent rejection.
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*
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* Rejection can be racy vs. resends. We have evaluated the
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* rejection in an atomic ICP transaction which is now complete,
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* so potentially the ICP can already accept the interrupt again.
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*
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* So we need to retry the delivery. Essentially the reject path
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* boils down to a failed delivery. Always.
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*
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* Now the interrupt could also have moved to a different target,
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* thus we may need to re-do the ICP lookup as well
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*/
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again:
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/* Get the ICS state and lock it */
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ics = kvmppc_xics_find_ics(xics, new_irq, &src);
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if (!ics) {
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XICS_DBG("icp_deliver_irq: IRQ 0x%06x not found !\n", new_irq);
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return;
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}
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state = &ics->irq_state[src];
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/* Get a lock on the ICS */
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mutex_lock(&ics->lock);
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/* Get our server */
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if (!icp || state->server != icp->server_num) {
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icp = kvmppc_xics_find_server(xics->kvm, state->server);
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if (!icp) {
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pr_warn("icp_deliver_irq: IRQ 0x%06x server 0x%x not found !\n",
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new_irq, state->server);
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goto out;
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}
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}
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/* Clear the resend bit of that interrupt */
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state->resend = 0;
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/*
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* If masked, bail out
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*
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* Note: PAPR doesn't mention anything about masked pending
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* when doing a resend, only when doing a delivery.
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*
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* However that would have the effect of losing a masked
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* interrupt that was rejected and isn't consistent with
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* the whole masked_pending business which is about not
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* losing interrupts that occur while masked.
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*
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* I don't differenciate normal deliveries and resends, this
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* implementation will differ from PAPR and not lose such
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* interrupts.
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*/
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if (state->priority == MASKED) {
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XICS_DBG("irq %#x masked pending\n", new_irq);
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state->masked_pending = 1;
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goto out;
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}
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/*
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* Try the delivery, this will set the need_resend flag
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* in the ICP as part of the atomic transaction if the
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* delivery is not possible.
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*
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* Note that if successful, the new delivery might have itself
|
|
|
|
* rejected an interrupt that was "delivered" before we took the
|
|
|
|
* icp mutex.
|
|
|
|
*
|
|
|
|
* In this case we do the whole sequence all over again for the
|
|
|
|
* new guy. We cannot assume that the rejected interrupt is less
|
|
|
|
* favored than the new one, and thus doesn't need to be delivered,
|
|
|
|
* because by the time we exit icp_try_to_deliver() the target
|
|
|
|
* processor may well have alrady consumed & completed it, and thus
|
|
|
|
* the rejected interrupt might actually be already acceptable.
|
|
|
|
*/
|
|
|
|
if (icp_try_to_deliver(icp, new_irq, state->priority, &reject)) {
|
|
|
|
/*
|
|
|
|
* Delivery was successful, did we reject somebody else ?
|
|
|
|
*/
|
|
|
|
if (reject && reject != XICS_IPI) {
|
|
|
|
mutex_unlock(&ics->lock);
|
|
|
|
new_irq = reject;
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* We failed to deliver the interrupt we need to set the
|
|
|
|
* resend map bit and mark the ICS state as needing a resend
|
|
|
|
*/
|
|
|
|
set_bit(ics->icsid, icp->resend_map);
|
|
|
|
state->resend = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the need_resend flag got cleared in the ICP some time
|
|
|
|
* between icp_try_to_deliver() atomic update and now, then
|
|
|
|
* we know it might have missed the resend_map bit. So we
|
|
|
|
* retry
|
|
|
|
*/
|
|
|
|
smp_mb();
|
|
|
|
if (!icp->state.need_resend) {
|
|
|
|
mutex_unlock(&ics->lock);
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
mutex_unlock(&ics->lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void icp_down_cppr(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
|
|
|
|
u8 new_cppr)
|
|
|
|
{
|
|
|
|
union kvmppc_icp_state old_state, new_state;
|
|
|
|
bool resend;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This handles several related states in one operation:
|
|
|
|
*
|
|
|
|
* ICP State: Down_CPPR
|
|
|
|
*
|
|
|
|
* Load CPPR with new value and if the XISR is 0
|
|
|
|
* then check for resends:
|
|
|
|
*
|
|
|
|
* ICP State: Resend
|
|
|
|
*
|
|
|
|
* If MFRR is more favored than CPPR, check for IPIs
|
|
|
|
* and notify ICS of a potential resend. This is done
|
|
|
|
* asynchronously (when used in real mode, we will have
|
|
|
|
* to exit here).
|
|
|
|
*
|
|
|
|
* We do not handle the complete Check_IPI as documented
|
|
|
|
* here. In the PAPR, this state will be used for both
|
|
|
|
* Set_MFRR and Down_CPPR. However, we know that we aren't
|
|
|
|
* changing the MFRR state here so we don't need to handle
|
|
|
|
* the case of an MFRR causing a reject of a pending irq,
|
|
|
|
* this will have been handled when the MFRR was set in the
|
|
|
|
* first place.
|
|
|
|
*
|
|
|
|
* Thus we don't have to handle rejects, only resends.
|
|
|
|
*
|
|
|
|
* When implementing real mode for HV KVM, resend will lead to
|
|
|
|
* a H_TOO_HARD return and the whole transaction will be handled
|
|
|
|
* in virtual mode.
|
|
|
|
*/
|
|
|
|
do {
|
|
|
|
old_state = new_state = ACCESS_ONCE(icp->state);
|
|
|
|
|
|
|
|
/* Down_CPPR */
|
|
|
|
new_state.cppr = new_cppr;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Cut down Resend / Check_IPI / IPI
|
|
|
|
*
|
|
|
|
* The logic is that we cannot have a pending interrupt
|
|
|
|
* trumped by an IPI at this point (see above), so we
|
|
|
|
* know that either the pending interrupt is already an
|
|
|
|
* IPI (in which case we don't care to override it) or
|
|
|
|
* it's either more favored than us or non existent
|
|
|
|
*/
|
|
|
|
if (new_state.mfrr < new_cppr &&
|
|
|
|
new_state.mfrr <= new_state.pending_pri) {
|
|
|
|
WARN_ON(new_state.xisr != XICS_IPI &&
|
|
|
|
new_state.xisr != 0);
|
|
|
|
new_state.pending_pri = new_state.mfrr;
|
|
|
|
new_state.xisr = XICS_IPI;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Latch/clear resend bit */
|
|
|
|
resend = new_state.need_resend;
|
|
|
|
new_state.need_resend = 0;
|
|
|
|
|
|
|
|
} while (!icp_try_update(icp, old_state, new_state, true));
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now handle resend checks. Those are asynchronous to the ICP
|
|
|
|
* state update in HW (ie bus transactions) so we can handle them
|
|
|
|
* separately here too
|
|
|
|
*/
|
|
|
|
if (resend)
|
|
|
|
icp_check_resend(xics, icp);
|
|
|
|
}
|
|
|
|
|
2013-04-17 20:31:15 +00:00
|
|
|
static noinline unsigned long kvmppc_h_xirr(struct kvm_vcpu *vcpu)
|
2013-04-17 20:30:26 +00:00
|
|
|
{
|
|
|
|
union kvmppc_icp_state old_state, new_state;
|
|
|
|
struct kvmppc_icp *icp = vcpu->arch.icp;
|
|
|
|
u32 xirr;
|
|
|
|
|
|
|
|
/* First, remove EE from the processor */
|
|
|
|
kvmppc_book3s_dequeue_irqprio(icp->vcpu,
|
|
|
|
BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ICP State: Accept_Interrupt
|
|
|
|
*
|
|
|
|
* Return the pending interrupt (if any) along with the
|
|
|
|
* current CPPR, then clear the XISR & set CPPR to the
|
|
|
|
* pending priority
|
|
|
|
*/
|
|
|
|
do {
|
|
|
|
old_state = new_state = ACCESS_ONCE(icp->state);
|
|
|
|
|
|
|
|
xirr = old_state.xisr | (((u32)old_state.cppr) << 24);
|
|
|
|
if (!old_state.xisr)
|
|
|
|
break;
|
|
|
|
new_state.cppr = new_state.pending_pri;
|
|
|
|
new_state.pending_pri = 0xff;
|
|
|
|
new_state.xisr = 0;
|
|
|
|
|
|
|
|
} while (!icp_try_update(icp, old_state, new_state, true));
|
|
|
|
|
|
|
|
XICS_DBG("h_xirr vcpu %d xirr %#x\n", vcpu->vcpu_id, xirr);
|
|
|
|
|
|
|
|
return xirr;
|
|
|
|
}
|
|
|
|
|
2013-04-17 20:31:15 +00:00
|
|
|
static noinline int kvmppc_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
|
|
|
|
unsigned long mfrr)
|
2013-04-17 20:30:26 +00:00
|
|
|
{
|
|
|
|
union kvmppc_icp_state old_state, new_state;
|
|
|
|
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
|
|
|
|
struct kvmppc_icp *icp;
|
|
|
|
u32 reject;
|
|
|
|
bool resend;
|
|
|
|
bool local;
|
|
|
|
|
|
|
|
XICS_DBG("h_ipi vcpu %d to server %lu mfrr %#lx\n",
|
|
|
|
vcpu->vcpu_id, server, mfrr);
|
|
|
|
|
|
|
|
icp = vcpu->arch.icp;
|
|
|
|
local = icp->server_num == server;
|
|
|
|
if (!local) {
|
|
|
|
icp = kvmppc_xics_find_server(vcpu->kvm, server);
|
|
|
|
if (!icp)
|
|
|
|
return H_PARAMETER;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ICP state: Set_MFRR
|
|
|
|
*
|
|
|
|
* If the CPPR is more favored than the new MFRR, then
|
|
|
|
* nothing needs to be rejected as there can be no XISR to
|
|
|
|
* reject. If the MFRR is being made less favored then
|
|
|
|
* there might be a previously-rejected interrupt needing
|
|
|
|
* to be resent.
|
|
|
|
*
|
|
|
|
* If the CPPR is less favored, then we might be replacing
|
|
|
|
* an interrupt, and thus need to possibly reject it as in
|
|
|
|
*
|
|
|
|
* ICP state: Check_IPI
|
|
|
|
*/
|
|
|
|
do {
|
|
|
|
old_state = new_state = ACCESS_ONCE(icp->state);
|
|
|
|
|
|
|
|
/* Set_MFRR */
|
|
|
|
new_state.mfrr = mfrr;
|
|
|
|
|
|
|
|
/* Check_IPI */
|
|
|
|
reject = 0;
|
|
|
|
resend = false;
|
|
|
|
if (mfrr < new_state.cppr) {
|
|
|
|
/* Reject a pending interrupt if not an IPI */
|
|
|
|
if (mfrr <= new_state.pending_pri)
|
|
|
|
reject = new_state.xisr;
|
|
|
|
new_state.pending_pri = mfrr;
|
|
|
|
new_state.xisr = XICS_IPI;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mfrr > old_state.mfrr && mfrr > new_state.cppr) {
|
|
|
|
resend = new_state.need_resend;
|
|
|
|
new_state.need_resend = 0;
|
|
|
|
}
|
|
|
|
} while (!icp_try_update(icp, old_state, new_state, local));
|
|
|
|
|
|
|
|
/* Handle reject */
|
|
|
|
if (reject && reject != XICS_IPI)
|
|
|
|
icp_deliver_irq(xics, icp, reject);
|
|
|
|
|
|
|
|
/* Handle resend */
|
|
|
|
if (resend)
|
|
|
|
icp_check_resend(xics, icp);
|
|
|
|
|
|
|
|
return H_SUCCESS;
|
|
|
|
}
|
|
|
|
|
2013-04-17 20:31:15 +00:00
|
|
|
static noinline void kvmppc_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr)
|
2013-04-17 20:30:26 +00:00
|
|
|
{
|
|
|
|
union kvmppc_icp_state old_state, new_state;
|
|
|
|
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
|
|
|
|
struct kvmppc_icp *icp = vcpu->arch.icp;
|
|
|
|
u32 reject;
|
|
|
|
|
|
|
|
XICS_DBG("h_cppr vcpu %d cppr %#lx\n", vcpu->vcpu_id, cppr);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ICP State: Set_CPPR
|
|
|
|
*
|
|
|
|
* We can safely compare the new value with the current
|
|
|
|
* value outside of the transaction as the CPPR is only
|
|
|
|
* ever changed by the processor on itself
|
|
|
|
*/
|
|
|
|
if (cppr > icp->state.cppr)
|
|
|
|
icp_down_cppr(xics, icp, cppr);
|
|
|
|
else if (cppr == icp->state.cppr)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ICP State: Up_CPPR
|
|
|
|
*
|
|
|
|
* The processor is raising its priority, this can result
|
|
|
|
* in a rejection of a pending interrupt:
|
|
|
|
*
|
|
|
|
* ICP State: Reject_Current
|
|
|
|
*
|
|
|
|
* We can remove EE from the current processor, the update
|
|
|
|
* transaction will set it again if needed
|
|
|
|
*/
|
|
|
|
kvmppc_book3s_dequeue_irqprio(icp->vcpu,
|
|
|
|
BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
|
|
|
|
|
|
|
|
do {
|
|
|
|
old_state = new_state = ACCESS_ONCE(icp->state);
|
|
|
|
|
|
|
|
reject = 0;
|
|
|
|
new_state.cppr = cppr;
|
|
|
|
|
|
|
|
if (cppr <= new_state.pending_pri) {
|
|
|
|
reject = new_state.xisr;
|
|
|
|
new_state.xisr = 0;
|
|
|
|
new_state.pending_pri = 0xff;
|
|
|
|
}
|
|
|
|
|
|
|
|
} while (!icp_try_update(icp, old_state, new_state, true));
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check for rejects. They are handled by doing a new delivery
|
|
|
|
* attempt (see comments in icp_deliver_irq).
|
|
|
|
*/
|
|
|
|
if (reject && reject != XICS_IPI)
|
|
|
|
icp_deliver_irq(xics, icp, reject);
|
|
|
|
}
|
|
|
|
|
2013-04-17 20:31:15 +00:00
|
|
|
static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
|
2013-04-17 20:30:26 +00:00
|
|
|
{
|
|
|
|
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
|
|
|
|
struct kvmppc_icp *icp = vcpu->arch.icp;
|
|
|
|
struct kvmppc_ics *ics;
|
|
|
|
struct ics_irq_state *state;
|
|
|
|
u32 irq = xirr & 0x00ffffff;
|
|
|
|
u16 src;
|
|
|
|
|
|
|
|
XICS_DBG("h_eoi vcpu %d eoi %#lx\n", vcpu->vcpu_id, xirr);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ICP State: EOI
|
|
|
|
*
|
|
|
|
* Note: If EOI is incorrectly used by SW to lower the CPPR
|
|
|
|
* value (ie more favored), we do not check for rejection of
|
|
|
|
* a pending interrupt, this is a SW error and PAPR sepcifies
|
|
|
|
* that we don't have to deal with it.
|
|
|
|
*
|
|
|
|
* The sending of an EOI to the ICS is handled after the
|
|
|
|
* CPPR update
|
|
|
|
*
|
|
|
|
* ICP State: Down_CPPR which we handle
|
|
|
|
* in a separate function as it's shared with H_CPPR.
|
|
|
|
*/
|
|
|
|
icp_down_cppr(xics, icp, xirr >> 24);
|
|
|
|
|
|
|
|
/* IPIs have no EOI */
|
|
|
|
if (irq == XICS_IPI)
|
|
|
|
return H_SUCCESS;
|
|
|
|
/*
|
|
|
|
* EOI handling: If the interrupt is still asserted, we need to
|
|
|
|
* resend it. We can take a lockless "peek" at the ICS state here.
|
|
|
|
*
|
|
|
|
* "Message" interrupts will never have "asserted" set
|
|
|
|
*/
|
|
|
|
ics = kvmppc_xics_find_ics(xics, irq, &src);
|
|
|
|
if (!ics) {
|
|
|
|
XICS_DBG("h_eoi: IRQ 0x%06x not found !\n", irq);
|
|
|
|
return H_PARAMETER;
|
|
|
|
}
|
|
|
|
state = &ics->irq_state[src];
|
|
|
|
|
|
|
|
/* Still asserted, resend it */
|
|
|
|
if (state->asserted)
|
|
|
|
icp_deliver_irq(xics, icp, irq);
|
|
|
|
|
|
|
|
return H_SUCCESS;
|
|
|
|
}
|
|
|
|
|
2013-04-17 20:31:15 +00:00
|
|
|
static noinline int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
|
|
|
|
{
|
|
|
|
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
|
|
|
|
struct kvmppc_icp *icp = vcpu->arch.icp;
|
|
|
|
|
|
|
|
XICS_DBG("XICS_RM: H_%x completing, act: %x state: %lx tgt: %p\n",
|
|
|
|
hcall, icp->rm_action, icp->rm_dbgstate.raw, icp->rm_dbgtgt);
|
|
|
|
|
|
|
|
if (icp->rm_action & XICS_RM_KICK_VCPU)
|
|
|
|
kvmppc_fast_vcpu_kick(icp->rm_kick_target);
|
|
|
|
if (icp->rm_action & XICS_RM_CHECK_RESEND)
|
|
|
|
icp_check_resend(xics, icp);
|
|
|
|
if (icp->rm_action & XICS_RM_REJECT)
|
|
|
|
icp_deliver_irq(xics, icp, icp->rm_reject);
|
|
|
|
|
|
|
|
icp->rm_action = 0;
|
|
|
|
|
|
|
|
return H_SUCCESS;
|
|
|
|
}
|
|
|
|
|
2013-04-17 20:30:26 +00:00
|
|
|
int kvmppc_xics_hcall(struct kvm_vcpu *vcpu, u32 req)
|
|
|
|
{
|
2013-04-17 20:31:15 +00:00
|
|
|
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
|
2013-04-17 20:30:26 +00:00
|
|
|
unsigned long res;
|
|
|
|
int rc = H_SUCCESS;
|
|
|
|
|
|
|
|
/* Check if we have an ICP */
|
2013-04-17 20:31:15 +00:00
|
|
|
if (!xics || !vcpu->arch.icp)
|
2013-04-17 20:30:26 +00:00
|
|
|
return H_HARDWARE;
|
|
|
|
|
2013-04-17 20:31:15 +00:00
|
|
|
/* Check for real mode returning too hard */
|
|
|
|
if (xics->real_mode)
|
|
|
|
return kvmppc_xics_rm_complete(vcpu, req);
|
|
|
|
|
2013-04-17 20:30:26 +00:00
|
|
|
switch (req) {
|
|
|
|
case H_XIRR:
|
2013-04-17 20:31:15 +00:00
|
|
|
res = kvmppc_h_xirr(vcpu);
|
2013-04-17 20:30:26 +00:00
|
|
|
kvmppc_set_gpr(vcpu, 4, res);
|
|
|
|
break;
|
|
|
|
case H_CPPR:
|
2013-04-17 20:31:15 +00:00
|
|
|
kvmppc_h_cppr(vcpu, kvmppc_get_gpr(vcpu, 4));
|
2013-04-17 20:30:26 +00:00
|
|
|
break;
|
|
|
|
case H_EOI:
|
2013-04-17 20:31:15 +00:00
|
|
|
rc = kvmppc_h_eoi(vcpu, kvmppc_get_gpr(vcpu, 4));
|
2013-04-17 20:30:26 +00:00
|
|
|
break;
|
|
|
|
case H_IPI:
|
2013-04-17 20:31:15 +00:00
|
|
|
rc = kvmppc_h_ipi(vcpu, kvmppc_get_gpr(vcpu, 4),
|
|
|
|
kvmppc_get_gpr(vcpu, 5));
|
2013-04-17 20:30:26 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* -- Initialisation code etc. -- */
|
|
|
|
|
|
|
|
static int xics_debug_show(struct seq_file *m, void *private)
|
|
|
|
{
|
|
|
|
struct kvmppc_xics *xics = m->private;
|
|
|
|
struct kvm *kvm = xics->kvm;
|
|
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
int icsid, i;
|
|
|
|
|
|
|
|
if (!kvm)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
seq_printf(m, "=========\nICP state\n=========\n");
|
|
|
|
|
|
|
|
kvm_for_each_vcpu(i, vcpu, kvm) {
|
|
|
|
struct kvmppc_icp *icp = vcpu->arch.icp;
|
|
|
|
union kvmppc_icp_state state;
|
|
|
|
|
|
|
|
if (!icp)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
state.raw = ACCESS_ONCE(icp->state.raw);
|
|
|
|
seq_printf(m, "cpu server %#lx XIRR:%#x PPRI:%#x CPPR:%#x MFRR:%#x OUT:%d NR:%d\n",
|
|
|
|
icp->server_num, state.xisr,
|
|
|
|
state.pending_pri, state.cppr, state.mfrr,
|
|
|
|
state.out_ee, state.need_resend);
|
|
|
|
}
|
|
|
|
|
|
|
|
for (icsid = 0; icsid <= KVMPPC_XICS_MAX_ICS_ID; icsid++) {
|
|
|
|
struct kvmppc_ics *ics = xics->ics[icsid];
|
|
|
|
|
|
|
|
if (!ics)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
seq_printf(m, "=========\nICS state for ICS 0x%x\n=========\n",
|
|
|
|
icsid);
|
|
|
|
|
|
|
|
mutex_lock(&ics->lock);
|
|
|
|
|
|
|
|
for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
|
|
|
|
struct ics_irq_state *irq = &ics->irq_state[i];
|
|
|
|
|
|
|
|
seq_printf(m, "irq 0x%06x: server %#x prio %#x save prio %#x asserted %d resend %d masked pending %d\n",
|
|
|
|
irq->number, irq->server, irq->priority,
|
|
|
|
irq->saved_priority, irq->asserted,
|
|
|
|
irq->resend, irq->masked_pending);
|
|
|
|
|
|
|
|
}
|
|
|
|
mutex_unlock(&ics->lock);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int xics_debug_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
return single_open(file, xics_debug_show, inode->i_private);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct file_operations xics_debug_fops = {
|
|
|
|
.open = xics_debug_open,
|
|
|
|
.read = seq_read,
|
|
|
|
.llseek = seq_lseek,
|
|
|
|
.release = single_release,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void xics_debugfs_init(struct kvmppc_xics *xics)
|
|
|
|
{
|
|
|
|
char *name;
|
|
|
|
|
|
|
|
name = kasprintf(GFP_KERNEL, "kvm-xics-%p", xics);
|
|
|
|
if (!name) {
|
|
|
|
pr_err("%s: no memory for name\n", __func__);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
xics->dentry = debugfs_create_file(name, S_IRUGO, powerpc_debugfs_root,
|
|
|
|
xics, &xics_debug_fops);
|
|
|
|
|
|
|
|
pr_debug("%s: created %s\n", __func__, name);
|
|
|
|
kfree(name);
|
|
|
|
}
|
|
|
|
|
|
|
|
struct kvmppc_ics *kvmppc_xics_create_ics(struct kvm *kvm,
|
|
|
|
struct kvmppc_xics *xics, int irq)
|
|
|
|
{
|
|
|
|
struct kvmppc_ics *ics;
|
|
|
|
int i, icsid;
|
|
|
|
|
|
|
|
icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
|
|
|
|
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
|
|
|
|
/* ICS already exists - somebody else got here first */
|
|
|
|
if (xics->ics[icsid])
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* Create the ICS */
|
|
|
|
ics = kzalloc(sizeof(struct kvmppc_ics), GFP_KERNEL);
|
|
|
|
if (!ics)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
mutex_init(&ics->lock);
|
|
|
|
ics->icsid = icsid;
|
|
|
|
|
|
|
|
for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
|
|
|
|
ics->irq_state[i].number = (icsid << KVMPPC_XICS_ICS_SHIFT) | i;
|
|
|
|
ics->irq_state[i].priority = MASKED;
|
|
|
|
ics->irq_state[i].saved_priority = MASKED;
|
|
|
|
}
|
|
|
|
smp_wmb();
|
|
|
|
xics->ics[icsid] = ics;
|
|
|
|
|
|
|
|
if (icsid > xics->max_icsid)
|
|
|
|
xics->max_icsid = icsid;
|
|
|
|
|
|
|
|
out:
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
return xics->ics[icsid];
|
|
|
|
}
|
|
|
|
|
|
|
|
int kvmppc_xics_create_icp(struct kvm_vcpu *vcpu, unsigned long server_num)
|
|
|
|
{
|
|
|
|
struct kvmppc_icp *icp;
|
|
|
|
|
|
|
|
if (!vcpu->kvm->arch.xics)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
if (kvmppc_xics_find_server(vcpu->kvm, server_num))
|
|
|
|
return -EEXIST;
|
|
|
|
|
|
|
|
icp = kzalloc(sizeof(struct kvmppc_icp), GFP_KERNEL);
|
|
|
|
if (!icp)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
icp->vcpu = vcpu;
|
|
|
|
icp->server_num = server_num;
|
|
|
|
icp->state.mfrr = MASKED;
|
|
|
|
icp->state.pending_pri = MASKED;
|
|
|
|
vcpu->arch.icp = icp;
|
|
|
|
|
|
|
|
XICS_DBG("created server for vcpu %d\n", vcpu->vcpu_id);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* -- ioctls -- */
|
|
|
|
|
|
|
|
int kvm_vm_ioctl_xics_irq(struct kvm *kvm, struct kvm_irq_level *args)
|
|
|
|
{
|
|
|
|
struct kvmppc_xics *xics;
|
|
|
|
int r;
|
|
|
|
|
|
|
|
/* locking against multiple callers? */
|
|
|
|
|
|
|
|
xics = kvm->arch.xics;
|
|
|
|
if (!xics)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
switch (args->level) {
|
|
|
|
case KVM_INTERRUPT_SET:
|
|
|
|
case KVM_INTERRUPT_SET_LEVEL:
|
|
|
|
case KVM_INTERRUPT_UNSET:
|
|
|
|
r = ics_deliver_irq(xics, args->irq, args->level);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
r = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
void kvmppc_xics_free(struct kvmppc_xics *xics)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
struct kvm *kvm = xics->kvm;
|
|
|
|
|
|
|
|
debugfs_remove(xics->dentry);
|
|
|
|
|
|
|
|
if (kvm)
|
|
|
|
kvm->arch.xics = NULL;
|
|
|
|
|
|
|
|
for (i = 0; i <= xics->max_icsid; i++)
|
|
|
|
kfree(xics->ics[i]);
|
|
|
|
kfree(xics);
|
|
|
|
}
|
|
|
|
|
|
|
|
int kvm_xics_create(struct kvm *kvm, u32 type)
|
|
|
|
{
|
|
|
|
struct kvmppc_xics *xics;
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
xics = kzalloc(sizeof(*xics), GFP_KERNEL);
|
|
|
|
if (!xics)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
xics->kvm = kvm;
|
|
|
|
|
|
|
|
/* Already there ? */
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
if (kvm->arch.xics)
|
|
|
|
ret = -EEXIST;
|
|
|
|
else
|
|
|
|
kvm->arch.xics = xics;
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
xics_debugfs_init(xics);
|
|
|
|
|
2013-04-17 20:31:15 +00:00
|
|
|
#ifdef CONFIG_KVM_BOOK3S_64_HV
|
|
|
|
if (cpu_has_feature(CPU_FTR_ARCH_206)) {
|
|
|
|
/* Enable real mode support */
|
|
|
|
xics->real_mode = ENABLE_REALMODE;
|
|
|
|
xics->real_mode_dbg = DEBUG_REALMODE;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_KVM_BOOK3S_64_HV */
|
|
|
|
|
2013-04-17 20:30:26 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu)
|
|
|
|
{
|
|
|
|
if (!vcpu->arch.icp)
|
|
|
|
return;
|
|
|
|
kfree(vcpu->arch.icp);
|
|
|
|
vcpu->arch.icp = NULL;
|
|
|
|
vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT;
|
|
|
|
}
|