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linux/arch/powerpc/kvm/mpic.c
Paul Mackerras 8ba918d488 KVM: irqchip: Provide and use accessors for irq routing table 
This provides accessor functions for the KVM interrupt mappings, in
order to reduce the amount of code that accesses the fields of the
kvm_irq_routing_table struct, and restrict that code to one file,
virt/kvm/irqchip.c.  The new functions are kvm_irq_map_gsi(), which
maps from a global interrupt number to a set of IRQ routing entries,
and kvm_irq_map_chip_pin, which maps from IRQ chip and pin numbers to
a global interrupt number.

This also moves the update of kvm_irq_routing_table::chip[][]
into irqchip.c, out of the various kvm_set_routing_entry
implementations.  That means that none of the kvm_set_routing_entry
implementations need the kvm_irq_routing_table argument anymore,
so this removes it.

This does not change any locking or data lifetime rules.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Tested-by: Eric Auger <eric.auger@linaro.org>
Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-05 14:26:16 +02:00

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/*
* OpenPIC emulation
*
* Copyright (c) 2004 Jocelyn Mayer
* 2011 Alexander Graf
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/kvm_host.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <asm/uaccess.h>
#include <asm/mpic.h>
#include <asm/kvm_para.h>
#include <asm/kvm_host.h>
#include <asm/kvm_ppc.h>
#include "iodev.h"
#define MAX_CPU 32
#define MAX_SRC 256
#define MAX_TMR 4
#define MAX_IPI 4
#define MAX_MSI 8
#define MAX_IRQ (MAX_SRC + MAX_IPI + MAX_TMR)
#define VID 0x03 /* MPIC version ID */
/* OpenPIC capability flags */
#define OPENPIC_FLAG_IDR_CRIT (1 << 0)
#define OPENPIC_FLAG_ILR (2 << 0)
/* OpenPIC address map */
#define OPENPIC_REG_SIZE 0x40000
#define OPENPIC_GLB_REG_START 0x0
#define OPENPIC_GLB_REG_SIZE 0x10F0
#define OPENPIC_TMR_REG_START 0x10F0
#define OPENPIC_TMR_REG_SIZE 0x220
#define OPENPIC_MSI_REG_START 0x1600
#define OPENPIC_MSI_REG_SIZE 0x200
#define OPENPIC_SUMMARY_REG_START 0x3800
#define OPENPIC_SUMMARY_REG_SIZE 0x800
#define OPENPIC_SRC_REG_START 0x10000
#define OPENPIC_SRC_REG_SIZE (MAX_SRC * 0x20)
#define OPENPIC_CPU_REG_START 0x20000
#define OPENPIC_CPU_REG_SIZE (0x100 + ((MAX_CPU - 1) * 0x1000))
struct fsl_mpic_info {
int max_ext;
};
static struct fsl_mpic_info fsl_mpic_20 = {
.max_ext = 12,
};
static struct fsl_mpic_info fsl_mpic_42 = {
.max_ext = 12,
};
#define FRR_NIRQ_SHIFT 16
#define FRR_NCPU_SHIFT 8
#define FRR_VID_SHIFT 0
#define VID_REVISION_1_2 2
#define VID_REVISION_1_3 3
#define VIR_GENERIC 0x00000000 /* Generic Vendor ID */
#define GCR_RESET 0x80000000
#define GCR_MODE_PASS 0x00000000
#define GCR_MODE_MIXED 0x20000000
#define GCR_MODE_PROXY 0x60000000
#define TBCR_CI 0x80000000 /* count inhibit */
#define TCCR_TOG 0x80000000 /* toggles when decrement to zero */
#define IDR_EP_SHIFT 31
#define IDR_EP_MASK (1 << IDR_EP_SHIFT)
#define IDR_CI0_SHIFT 30
#define IDR_CI1_SHIFT 29
#define IDR_P1_SHIFT 1
#define IDR_P0_SHIFT 0
#define ILR_INTTGT_MASK 0x000000ff
#define ILR_INTTGT_INT 0x00
#define ILR_INTTGT_CINT 0x01 /* critical */
#define ILR_INTTGT_MCP 0x02 /* machine check */
#define NUM_OUTPUTS 3
#define MSIIR_OFFSET 0x140
#define MSIIR_SRS_SHIFT 29
#define MSIIR_SRS_MASK (0x7 << MSIIR_SRS_SHIFT)
#define MSIIR_IBS_SHIFT 24
#define MSIIR_IBS_MASK (0x1f << MSIIR_IBS_SHIFT)
static int get_current_cpu(void)
{
#if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
struct kvm_vcpu *vcpu = current->thread.kvm_vcpu;
return vcpu ? vcpu->arch.irq_cpu_id : -1;
#else
/* XXX */
return -1;
#endif
}
static int openpic_cpu_write_internal(void *opaque, gpa_t addr,
u32 val, int idx);
static int openpic_cpu_read_internal(void *opaque, gpa_t addr,
u32 *ptr, int idx);
static inline void write_IRQreg_idr(struct openpic *opp, int n_IRQ,
uint32_t val);
enum irq_type {
IRQ_TYPE_NORMAL = 0,
IRQ_TYPE_FSLINT, /* FSL internal interrupt -- level only */
IRQ_TYPE_FSLSPECIAL, /* FSL timer/IPI interrupt, edge, no polarity */
};
struct irq_queue {
/* Round up to the nearest 64 IRQs so that the queue length
* won't change when moving between 32 and 64 bit hosts.
*/
unsigned long queue[BITS_TO_LONGS((MAX_IRQ + 63) & ~63)];
int next;
int priority;
};
struct irq_source {
uint32_t ivpr; /* IRQ vector/priority register */
uint32_t idr; /* IRQ destination register */
uint32_t destmask; /* bitmap of CPU destinations */
int last_cpu;
int output; /* IRQ level, e.g. ILR_INTTGT_INT */
int pending; /* TRUE if IRQ is pending */
enum irq_type type;
bool level:1; /* level-triggered */
bool nomask:1; /* critical interrupts ignore mask on some FSL MPICs */
};
#define IVPR_MASK_SHIFT 31
#define IVPR_MASK_MASK (1 << IVPR_MASK_SHIFT)
#define IVPR_ACTIVITY_SHIFT 30
#define IVPR_ACTIVITY_MASK (1 << IVPR_ACTIVITY_SHIFT)
#define IVPR_MODE_SHIFT 29
#define IVPR_MODE_MASK (1 << IVPR_MODE_SHIFT)
#define IVPR_POLARITY_SHIFT 23
#define IVPR_POLARITY_MASK (1 << IVPR_POLARITY_SHIFT)
#define IVPR_SENSE_SHIFT 22
#define IVPR_SENSE_MASK (1 << IVPR_SENSE_SHIFT)
#define IVPR_PRIORITY_MASK (0xF << 16)
#define IVPR_PRIORITY(_ivprr_) ((int)(((_ivprr_) & IVPR_PRIORITY_MASK) >> 16))
#define IVPR_VECTOR(opp, _ivprr_) ((_ivprr_) & (opp)->vector_mask)
/* IDR[EP/CI] are only for FSL MPIC prior to v4.0 */
#define IDR_EP 0x80000000 /* external pin */
#define IDR_CI 0x40000000 /* critical interrupt */
struct irq_dest {
struct kvm_vcpu *vcpu;
int32_t ctpr; /* CPU current task priority */
struct irq_queue raised;
struct irq_queue servicing;
/* Count of IRQ sources asserting on non-INT outputs */
uint32_t outputs_active[NUM_OUTPUTS];
};
#define MAX_MMIO_REGIONS 10
struct openpic {
struct kvm *kvm;
struct kvm_device *dev;
struct kvm_io_device mmio;
const struct mem_reg *mmio_regions[MAX_MMIO_REGIONS];
int num_mmio_regions;
gpa_t reg_base;
spinlock_t lock;
/* Behavior control */
struct fsl_mpic_info *fsl;
uint32_t model;
uint32_t flags;
uint32_t nb_irqs;
uint32_t vid;
uint32_t vir; /* Vendor identification register */
uint32_t vector_mask;
uint32_t tfrr_reset;
uint32_t ivpr_reset;
uint32_t idr_reset;
uint32_t brr1;
uint32_t mpic_mode_mask;
/* Global registers */
uint32_t frr; /* Feature reporting register */
uint32_t gcr; /* Global configuration register */
uint32_t pir; /* Processor initialization register */
uint32_t spve; /* Spurious vector register */
uint32_t tfrr; /* Timer frequency reporting register */
/* Source registers */
struct irq_source src[MAX_IRQ];
/* Local registers per output pin */
struct irq_dest dst[MAX_CPU];
uint32_t nb_cpus;
/* Timer registers */
struct {
uint32_t tccr; /* Global timer current count register */
uint32_t tbcr; /* Global timer base count register */
} timers[MAX_TMR];
/* Shared MSI registers */
struct {
uint32_t msir; /* Shared Message Signaled Interrupt Register */
} msi[MAX_MSI];
uint32_t max_irq;
uint32_t irq_ipi0;
uint32_t irq_tim0;
uint32_t irq_msi;
};
static void mpic_irq_raise(struct openpic *opp, struct irq_dest *dst,
int output)
{
struct kvm_interrupt irq = {
.irq = KVM_INTERRUPT_SET_LEVEL,
};
if (!dst->vcpu) {
pr_debug("%s: destination cpu %d does not exist\n",
__func__, (int)(dst - &opp->dst[0]));
return;
}
pr_debug("%s: cpu %d output %d\n", __func__, dst->vcpu->arch.irq_cpu_id,
output);
if (output != ILR_INTTGT_INT) /* TODO */
return;
kvm_vcpu_ioctl_interrupt(dst->vcpu, &irq);
}
static void mpic_irq_lower(struct openpic *opp, struct irq_dest *dst,
int output)
{
if (!dst->vcpu) {
pr_debug("%s: destination cpu %d does not exist\n",
__func__, (int)(dst - &opp->dst[0]));
return;
}
pr_debug("%s: cpu %d output %d\n", __func__, dst->vcpu->arch.irq_cpu_id,
output);
if (output != ILR_INTTGT_INT) /* TODO */
return;
kvmppc_core_dequeue_external(dst->vcpu);
}
static inline void IRQ_setbit(struct irq_queue *q, int n_IRQ)
{
set_bit(n_IRQ, q->queue);
}
static inline void IRQ_resetbit(struct irq_queue *q, int n_IRQ)
{
clear_bit(n_IRQ, q->queue);
}
static inline int IRQ_testbit(struct irq_queue *q, int n_IRQ)
{
return test_bit(n_IRQ, q->queue);
}
static void IRQ_check(struct openpic *opp, struct irq_queue *q)
{
int irq = -1;
int next = -1;
int priority = -1;
for (;;) {
irq = find_next_bit(q->queue, opp->max_irq, irq + 1);
if (irq == opp->max_irq)
break;
pr_debug("IRQ_check: irq %d set ivpr_pr=%d pr=%d\n",
irq, IVPR_PRIORITY(opp->src[irq].ivpr), priority);
if (IVPR_PRIORITY(opp->src[irq].ivpr) > priority) {
next = irq;
priority = IVPR_PRIORITY(opp->src[irq].ivpr);
}
}
q->next = next;
q->priority = priority;
}
static int IRQ_get_next(struct openpic *opp, struct irq_queue *q)
{
/* XXX: optimize */
IRQ_check(opp, q);
return q->next;
}
static void IRQ_local_pipe(struct openpic *opp, int n_CPU, int n_IRQ,
bool active, bool was_active)
{
struct irq_dest *dst;
struct irq_source *src;
int priority;
dst = &opp->dst[n_CPU];
src = &opp->src[n_IRQ];
pr_debug("%s: IRQ %d active %d was %d\n",
__func__, n_IRQ, active, was_active);
if (src->output != ILR_INTTGT_INT) {
pr_debug("%s: output %d irq %d active %d was %d count %d\n",
__func__, src->output, n_IRQ, active, was_active,
dst->outputs_active[src->output]);
/* On Freescale MPIC, critical interrupts ignore priority,
* IACK, EOI, etc. Before MPIC v4.1 they also ignore
* masking.
*/
if (active) {
if (!was_active &&
dst->outputs_active[src->output]++ == 0) {
pr_debug("%s: Raise OpenPIC output %d cpu %d irq %d\n",
__func__, src->output, n_CPU, n_IRQ);
mpic_irq_raise(opp, dst, src->output);
}
} else {
if (was_active &&
--dst->outputs_active[src->output] == 0) {
pr_debug("%s: Lower OpenPIC output %d cpu %d irq %d\n",
__func__, src->output, n_CPU, n_IRQ);
mpic_irq_lower(opp, dst, src->output);
}
}
return;
}
priority = IVPR_PRIORITY(src->ivpr);
/* Even if the interrupt doesn't have enough priority,
* it is still raised, in case ctpr is lowered later.
*/
if (active)
IRQ_setbit(&dst->raised, n_IRQ);
else
IRQ_resetbit(&dst->raised, n_IRQ);
IRQ_check(opp, &dst->raised);
if (active && priority <= dst->ctpr) {
pr_debug("%s: IRQ %d priority %d too low for ctpr %d on CPU %d\n",
__func__, n_IRQ, priority, dst->ctpr, n_CPU);
active = 0;
}
if (active) {
if (IRQ_get_next(opp, &dst->servicing) >= 0 &&
priority <= dst->servicing.priority) {
pr_debug("%s: IRQ %d is hidden by servicing IRQ %d on CPU %d\n",
__func__, n_IRQ, dst->servicing.next, n_CPU);
} else {
pr_debug("%s: Raise OpenPIC INT output cpu %d irq %d/%d\n",
__func__, n_CPU, n_IRQ, dst->raised.next);
mpic_irq_raise(opp, dst, ILR_INTTGT_INT);
}
} else {
IRQ_get_next(opp, &dst->servicing);
if (dst->raised.priority > dst->ctpr &&
dst->raised.priority > dst->servicing.priority) {
pr_debug("%s: IRQ %d inactive, IRQ %d prio %d above %d/%d, CPU %d\n",
__func__, n_IRQ, dst->raised.next,
dst->raised.priority, dst->ctpr,
dst->servicing.priority, n_CPU);
/* IRQ line stays asserted */
} else {
pr_debug("%s: IRQ %d inactive, current prio %d/%d, CPU %d\n",
__func__, n_IRQ, dst->ctpr,
dst->servicing.priority, n_CPU);
mpic_irq_lower(opp, dst, ILR_INTTGT_INT);
}
}
}
/* update pic state because registers for n_IRQ have changed value */
static void openpic_update_irq(struct openpic *opp, int n_IRQ)
{
struct irq_source *src;
bool active, was_active;
int i;
src = &opp->src[n_IRQ];
active = src->pending;
if ((src->ivpr & IVPR_MASK_MASK) && !src->nomask) {
/* Interrupt source is disabled */
pr_debug("%s: IRQ %d is disabled\n", __func__, n_IRQ);
active = false;
}
was_active = !!(src->ivpr & IVPR_ACTIVITY_MASK);
/*
* We don't have a similar check for already-active because
* ctpr may have changed and we need to withdraw the interrupt.
*/
if (!active && !was_active) {
pr_debug("%s: IRQ %d is already inactive\n", __func__, n_IRQ);
return;
}
if (active)
src->ivpr |= IVPR_ACTIVITY_MASK;
else
src->ivpr &= ~IVPR_ACTIVITY_MASK;
if (src->destmask == 0) {
/* No target */
pr_debug("%s: IRQ %d has no target\n", __func__, n_IRQ);
return;
}
if (src->destmask == (1 << src->last_cpu)) {
/* Only one CPU is allowed to receive this IRQ */
IRQ_local_pipe(opp, src->last_cpu, n_IRQ, active, was_active);
} else if (!(src->ivpr & IVPR_MODE_MASK)) {
/* Directed delivery mode */
for (i = 0; i < opp->nb_cpus; i++) {
if (src->destmask & (1 << i)) {
IRQ_local_pipe(opp, i, n_IRQ, active,
was_active);
}
}
} else {
/* Distributed delivery mode */
for (i = src->last_cpu + 1; i != src->last_cpu; i++) {
if (i == opp->nb_cpus)
i = 0;
if (src->destmask & (1 << i)) {
IRQ_local_pipe(opp, i, n_IRQ, active,
was_active);
src->last_cpu = i;
break;
}
}
}
}
static void openpic_set_irq(void *opaque, int n_IRQ, int level)
{
struct openpic *opp = opaque;
struct irq_source *src;
if (n_IRQ >= MAX_IRQ) {
WARN_ONCE(1, "%s: IRQ %d out of range\n", __func__, n_IRQ);
return;
}
src = &opp->src[n_IRQ];
pr_debug("openpic: set irq %d = %d ivpr=0x%08x\n",
n_IRQ, level, src->ivpr);
if (src->level) {
/* level-sensitive irq */
src->pending = level;
openpic_update_irq(opp, n_IRQ);
} else {
/* edge-sensitive irq */
if (level) {
src->pending = 1;
openpic_update_irq(opp, n_IRQ);
}
if (src->output != ILR_INTTGT_INT) {
/* Edge-triggered interrupts shouldn't be used
* with non-INT delivery, but just in case,
* try to make it do something sane rather than
* cause an interrupt storm. This is close to
* what you'd probably see happen in real hardware.
*/
src->pending = 0;
openpic_update_irq(opp, n_IRQ);
}
}
}
static void openpic_reset(struct openpic *opp)
{
int i;
opp->gcr = GCR_RESET;
/* Initialise controller registers */
opp->frr = ((opp->nb_irqs - 1) << FRR_NIRQ_SHIFT) |
(opp->vid << FRR_VID_SHIFT);
opp->pir = 0;
opp->spve = -1 & opp->vector_mask;
opp->tfrr = opp->tfrr_reset;
/* Initialise IRQ sources */
for (i = 0; i < opp->max_irq; i++) {
opp->src[i].ivpr = opp->ivpr_reset;
switch (opp->src[i].type) {
case IRQ_TYPE_NORMAL:
opp->src[i].level =
!!(opp->ivpr_reset & IVPR_SENSE_MASK);
break;
case IRQ_TYPE_FSLINT:
opp->src[i].ivpr |= IVPR_POLARITY_MASK;
break;
case IRQ_TYPE_FSLSPECIAL:
break;
}
write_IRQreg_idr(opp, i, opp->idr_reset);
}
/* Initialise IRQ destinations */
for (i = 0; i < MAX_CPU; i++) {
opp->dst[i].ctpr = 15;
memset(&opp->dst[i].raised, 0, sizeof(struct irq_queue));
opp->dst[i].raised.next = -1;
memset(&opp->dst[i].servicing, 0, sizeof(struct irq_queue));
opp->dst[i].servicing.next = -1;
}
/* Initialise timers */
for (i = 0; i < MAX_TMR; i++) {
opp->timers[i].tccr = 0;
opp->timers[i].tbcr = TBCR_CI;
}
/* Go out of RESET state */
opp->gcr = 0;
}
static inline uint32_t read_IRQreg_idr(struct openpic *opp, int n_IRQ)
{
return opp->src[n_IRQ].idr;
}
static inline uint32_t read_IRQreg_ilr(struct openpic *opp, int n_IRQ)
{
if (opp->flags & OPENPIC_FLAG_ILR)
return opp->src[n_IRQ].output;
return 0xffffffff;
}
static inline uint32_t read_IRQreg_ivpr(struct openpic *opp, int n_IRQ)
{
return opp->src[n_IRQ].ivpr;
}
static inline void write_IRQreg_idr(struct openpic *opp, int n_IRQ,
uint32_t val)
{
struct irq_source *src = &opp->src[n_IRQ];
uint32_t normal_mask = (1UL << opp->nb_cpus) - 1;
uint32_t crit_mask = 0;
uint32_t mask = normal_mask;
int crit_shift = IDR_EP_SHIFT - opp->nb_cpus;
int i;
if (opp->flags & OPENPIC_FLAG_IDR_CRIT) {
crit_mask = mask << crit_shift;
mask |= crit_mask | IDR_EP;
}
src->idr = val & mask;
pr_debug("Set IDR %d to 0x%08x\n", n_IRQ, src->idr);
if (opp->flags & OPENPIC_FLAG_IDR_CRIT) {
if (src->idr & crit_mask) {
if (src->idr & normal_mask) {
pr_debug("%s: IRQ configured for multiple output types, using critical\n",
__func__);
}
src->output = ILR_INTTGT_CINT;
src->nomask = true;
src->destmask = 0;
for (i = 0; i < opp->nb_cpus; i++) {
int n_ci = IDR_CI0_SHIFT - i;
if (src->idr & (1UL << n_ci))
src->destmask |= 1UL << i;
}
} else {
src->output = ILR_INTTGT_INT;
src->nomask = false;
src->destmask = src->idr & normal_mask;
}
} else {
src->destmask = src->idr;
}
}
static inline void write_IRQreg_ilr(struct openpic *opp, int n_IRQ,
uint32_t val)
{
if (opp->flags & OPENPIC_FLAG_ILR) {
struct irq_source *src = &opp->src[n_IRQ];
src->output = val & ILR_INTTGT_MASK;
pr_debug("Set ILR %d to 0x%08x, output %d\n", n_IRQ, src->idr,
src->output);
/* TODO: on MPIC v4.0 only, set nomask for non-INT */
}
}
static inline void write_IRQreg_ivpr(struct openpic *opp, int n_IRQ,
uint32_t val)
{
uint32_t mask;
/* NOTE when implementing newer FSL MPIC models: starting with v4.0,
* the polarity bit is read-only on internal interrupts.
*/
mask = IVPR_MASK_MASK | IVPR_PRIORITY_MASK | IVPR_SENSE_MASK |
IVPR_POLARITY_MASK | opp->vector_mask;
/* ACTIVITY bit is read-only */
opp->src[n_IRQ].ivpr =
(opp->src[n_IRQ].ivpr & IVPR_ACTIVITY_MASK) | (val & mask);
/* For FSL internal interrupts, The sense bit is reserved and zero,
* and the interrupt is always level-triggered. Timers and IPIs
* have no sense or polarity bits, and are edge-triggered.
*/
switch (opp->src[n_IRQ].type) {
case IRQ_TYPE_NORMAL:
opp->src[n_IRQ].level =
!!(opp->src[n_IRQ].ivpr & IVPR_SENSE_MASK);
break;
case IRQ_TYPE_FSLINT:
opp->src[n_IRQ].ivpr &= ~IVPR_SENSE_MASK;
break;
case IRQ_TYPE_FSLSPECIAL:
opp->src[n_IRQ].ivpr &= ~(IVPR_POLARITY_MASK | IVPR_SENSE_MASK);
break;
}
openpic_update_irq(opp, n_IRQ);
pr_debug("Set IVPR %d to 0x%08x -> 0x%08x\n", n_IRQ, val,
opp->src[n_IRQ].ivpr);
}
static void openpic_gcr_write(struct openpic *opp, uint64_t val)
{
if (val & GCR_RESET) {
openpic_reset(opp);
return;
}
opp->gcr &= ~opp->mpic_mode_mask;
opp->gcr |= val & opp->mpic_mode_mask;
}
static int openpic_gbl_write(void *opaque, gpa_t addr, u32 val)
{
struct openpic *opp = opaque;
int err = 0;
pr_debug("%s: addr %#llx <= %08x\n", __func__, addr, val);
if (addr & 0xF)
return 0;
switch (addr) {
case 0x00: /* Block Revision Register1 (BRR1) is Readonly */
break;
case 0x40:
case 0x50:
case 0x60:
case 0x70:
case 0x80:
case 0x90:
case 0xA0:
case 0xB0:
err = openpic_cpu_write_internal(opp, addr, val,
get_current_cpu());
break;
case 0x1000: /* FRR */
break;
case 0x1020: /* GCR */
openpic_gcr_write(opp, val);
break;
case 0x1080: /* VIR */
break;
case 0x1090: /* PIR */
/*
* This register is used to reset a CPU core --
* let userspace handle it.
*/
err = -ENXIO;
break;
case 0x10A0: /* IPI_IVPR */
case 0x10B0:
case 0x10C0:
case 0x10D0: {
int idx;
idx = (addr - 0x10A0) >> 4;
write_IRQreg_ivpr(opp, opp->irq_ipi0 + idx, val);
break;
}
case 0x10E0: /* SPVE */
opp->spve = val & opp->vector_mask;
break;
default:
break;
}
return err;
}
static int openpic_gbl_read(void *opaque, gpa_t addr, u32 *ptr)
{
struct openpic *opp = opaque;
u32 retval;
int err = 0;
pr_debug("%s: addr %#llx\n", __func__, addr);
retval = 0xFFFFFFFF;
if (addr & 0xF)
goto out;
switch (addr) {
case 0x1000: /* FRR */
retval = opp->frr;
retval |= (opp->nb_cpus - 1) << FRR_NCPU_SHIFT;
break;
case 0x1020: /* GCR */
retval = opp->gcr;
break;
case 0x1080: /* VIR */
retval = opp->vir;
break;
case 0x1090: /* PIR */
retval = 0x00000000;
break;
case 0x00: /* Block Revision Register1 (BRR1) */
retval = opp->brr1;
break;
case 0x40:
case 0x50:
case 0x60:
case 0x70:
case 0x80:
case 0x90:
case 0xA0:
case 0xB0:
err = openpic_cpu_read_internal(opp, addr,
&retval, get_current_cpu());
break;
case 0x10A0: /* IPI_IVPR */
case 0x10B0:
case 0x10C0:
case 0x10D0:
{
int idx;
idx = (addr - 0x10A0) >> 4;
retval = read_IRQreg_ivpr(opp, opp->irq_ipi0 + idx);
}
break;
case 0x10E0: /* SPVE */
retval = opp->spve;
break;
default:
break;
}
out:
pr_debug("%s: => 0x%08x\n", __func__, retval);
*ptr = retval;
return err;
}
static int openpic_tmr_write(void *opaque, gpa_t addr, u32 val)
{
struct openpic *opp = opaque;
int idx;
addr += 0x10f0;
pr_debug("%s: addr %#llx <= %08x\n", __func__, addr, val);
if (addr & 0xF)
return 0;
if (addr == 0x10f0) {
/* TFRR */
opp->tfrr = val;
return 0;
}
idx = (addr >> 6) & 0x3;
addr = addr & 0x30;
switch (addr & 0x30) {
case 0x00: /* TCCR */
break;
case 0x10: /* TBCR */
if ((opp->timers[idx].tccr & TCCR_TOG) != 0 &&
(val & TBCR_CI) == 0 &&
(opp->timers[idx].tbcr & TBCR_CI) != 0)
opp->timers[idx].tccr &= ~TCCR_TOG;
opp->timers[idx].tbcr = val;
break;
case 0x20: /* TVPR */
write_IRQreg_ivpr(opp, opp->irq_tim0 + idx, val);
break;
case 0x30: /* TDR */
write_IRQreg_idr(opp, opp->irq_tim0 + idx, val);
break;
}
return 0;
}
static int openpic_tmr_read(void *opaque, gpa_t addr, u32 *ptr)
{
struct openpic *opp = opaque;
uint32_t retval = -1;
int idx;
pr_debug("%s: addr %#llx\n", __func__, addr);
if (addr & 0xF)
goto out;
idx = (addr >> 6) & 0x3;
if (addr == 0x0) {
/* TFRR */
retval = opp->tfrr;
goto out;
}
switch (addr & 0x30) {
case 0x00: /* TCCR */
retval = opp->timers[idx].tccr;
break;
case 0x10: /* TBCR */
retval = opp->timers[idx].tbcr;
break;
case 0x20: /* TIPV */
retval = read_IRQreg_ivpr(opp, opp->irq_tim0 + idx);
break;
case 0x30: /* TIDE (TIDR) */
retval = read_IRQreg_idr(opp, opp->irq_tim0 + idx);
break;
}
out:
pr_debug("%s: => 0x%08x\n", __func__, retval);
*ptr = retval;
return 0;
}
static int openpic_src_write(void *opaque, gpa_t addr, u32 val)
{
struct openpic *opp = opaque;
int idx;
pr_debug("%s: addr %#llx <= %08x\n", __func__, addr, val);
addr = addr & 0xffff;
idx = addr >> 5;
switch (addr & 0x1f) {
case 0x00:
write_IRQreg_ivpr(opp, idx, val);
break;
case 0x10:
write_IRQreg_idr(opp, idx, val);
break;
case 0x18:
write_IRQreg_ilr(opp, idx, val);
break;
}
return 0;
}
static int openpic_src_read(void *opaque, gpa_t addr, u32 *ptr)
{
struct openpic *opp = opaque;
uint32_t retval;
int idx;
pr_debug("%s: addr %#llx\n", __func__, addr);
retval = 0xFFFFFFFF;
addr = addr & 0xffff;
idx = addr >> 5;
switch (addr & 0x1f) {
case 0x00:
retval = read_IRQreg_ivpr(opp, idx);
break;
case 0x10:
retval = read_IRQreg_idr(opp, idx);
break;
case 0x18:
retval = read_IRQreg_ilr(opp, idx);
break;
}
pr_debug("%s: => 0x%08x\n", __func__, retval);
*ptr = retval;
return 0;
}
static int openpic_msi_write(void *opaque, gpa_t addr, u32 val)
{
struct openpic *opp = opaque;
int idx = opp->irq_msi;
int srs, ibs;
pr_debug("%s: addr %#llx <= 0x%08x\n", __func__, addr, val);
if (addr & 0xF)
return 0;
switch (addr) {
case MSIIR_OFFSET:
srs = val >> MSIIR_SRS_SHIFT;
idx += srs;
ibs = (val & MSIIR_IBS_MASK) >> MSIIR_IBS_SHIFT;
opp->msi[srs].msir |= 1 << ibs;
openpic_set_irq(opp, idx, 1);
break;
default:
/* most registers are read-only, thus ignored */
break;
}
return 0;
}
static int openpic_msi_read(void *opaque, gpa_t addr, u32 *ptr)
{
struct openpic *opp = opaque;
uint32_t r = 0;
int i, srs;
pr_debug("%s: addr %#llx\n", __func__, addr);
if (addr & 0xF)
return -ENXIO;
srs = addr >> 4;
switch (addr) {
case 0x00:
case 0x10:
case 0x20:
case 0x30:
case 0x40:
case 0x50:
case 0x60:
case 0x70: /* MSIRs */
r = opp->msi[srs].msir;
/* Clear on read */
opp->msi[srs].msir = 0;
openpic_set_irq(opp, opp->irq_msi + srs, 0);
break;
case 0x120: /* MSISR */
for (i = 0; i < MAX_MSI; i++)
r |= (opp->msi[i].msir ? 1 : 0) << i;
break;
}
pr_debug("%s: => 0x%08x\n", __func__, r);
*ptr = r;
return 0;
}
static int openpic_summary_read(void *opaque, gpa_t addr, u32 *ptr)
{
uint32_t r = 0;
pr_debug("%s: addr %#llx\n", __func__, addr);
/* TODO: EISR/EIMR */
*ptr = r;
return 0;
}
static int openpic_summary_write(void *opaque, gpa_t addr, u32 val)
{
pr_debug("%s: addr %#llx <= 0x%08x\n", __func__, addr, val);
/* TODO: EISR/EIMR */
return 0;
}
static int openpic_cpu_write_internal(void *opaque, gpa_t addr,
u32 val, int idx)
{
struct openpic *opp = opaque;
struct irq_source *src;
struct irq_dest *dst;
int s_IRQ, n_IRQ;
pr_debug("%s: cpu %d addr %#llx <= 0x%08x\n", __func__, idx,
addr, val);
if (idx < 0)
return 0;
if (addr & 0xF)
return 0;
dst = &opp->dst[idx];
addr &= 0xFF0;
switch (addr) {
case 0x40: /* IPIDR */
case 0x50:
case 0x60:
case 0x70:
idx = (addr - 0x40) >> 4;
/* we use IDE as mask which CPUs to deliver the IPI to still. */
opp->src[opp->irq_ipi0 + idx].destmask |= val;
openpic_set_irq(opp, opp->irq_ipi0 + idx, 1);
openpic_set_irq(opp, opp->irq_ipi0 + idx, 0);
break;
case 0x80: /* CTPR */
dst->ctpr = val & 0x0000000F;
pr_debug("%s: set CPU %d ctpr to %d, raised %d servicing %d\n",
__func__, idx, dst->ctpr, dst->raised.priority,
dst->servicing.priority);
if (dst->raised.priority <= dst->ctpr) {
pr_debug("%s: Lower OpenPIC INT output cpu %d due to ctpr\n",
__func__, idx);
mpic_irq_lower(opp, dst, ILR_INTTGT_INT);
} else if (dst->raised.priority > dst->servicing.priority) {
pr_debug("%s: Raise OpenPIC INT output cpu %d irq %d\n",
__func__, idx, dst->raised.next);
mpic_irq_raise(opp, dst, ILR_INTTGT_INT);
}
break;
case 0x90: /* WHOAMI */
/* Read-only register */
break;
case 0xA0: /* IACK */
/* Read-only register */
break;
case 0xB0: { /* EOI */
int notify_eoi;
pr_debug("EOI\n");
s_IRQ = IRQ_get_next(opp, &dst->servicing);
if (s_IRQ < 0) {
pr_debug("%s: EOI with no interrupt in service\n",
__func__);
break;
}
IRQ_resetbit(&dst->servicing, s_IRQ);
/* Notify listeners that the IRQ is over */
notify_eoi = s_IRQ;
/* Set up next servicing IRQ */
s_IRQ = IRQ_get_next(opp, &dst->servicing);
/* Check queued interrupts. */
n_IRQ = IRQ_get_next(opp, &dst->raised);
src = &opp->src[n_IRQ];
if (n_IRQ != -1 &&
(s_IRQ == -1 ||
IVPR_PRIORITY(src->ivpr) > dst->servicing.priority)) {
pr_debug("Raise OpenPIC INT output cpu %d irq %d\n",
idx, n_IRQ);
mpic_irq_raise(opp, dst, ILR_INTTGT_INT);
}
spin_unlock(&opp->lock);
kvm_notify_acked_irq(opp->kvm, 0, notify_eoi);
spin_lock(&opp->lock);
break;
}
default:
break;
}
return 0;
}
static int openpic_cpu_write(void *opaque, gpa_t addr, u32 val)
{
struct openpic *opp = opaque;
return openpic_cpu_write_internal(opp, addr, val,
(addr & 0x1f000) >> 12);
}
static uint32_t openpic_iack(struct openpic *opp, struct irq_dest *dst,
int cpu)
{
struct irq_source *src;
int retval, irq;
pr_debug("Lower OpenPIC INT output\n");
mpic_irq_lower(opp, dst, ILR_INTTGT_INT);
irq = IRQ_get_next(opp, &dst->raised);
pr_debug("IACK: irq=%d\n", irq);
if (irq == -1)
/* No more interrupt pending */
return opp->spve;
src = &opp->src[irq];
if (!(src->ivpr & IVPR_ACTIVITY_MASK) ||
!(IVPR_PRIORITY(src->ivpr) > dst->ctpr)) {
pr_err("%s: bad raised IRQ %d ctpr %d ivpr 0x%08x\n",
__func__, irq, dst->ctpr, src->ivpr);
openpic_update_irq(opp, irq);
retval = opp->spve;
} else {
/* IRQ enter servicing state */
IRQ_setbit(&dst->servicing, irq);
retval = IVPR_VECTOR(opp, src->ivpr);
}
if (!src->level) {
/* edge-sensitive IRQ */
src->ivpr &= ~IVPR_ACTIVITY_MASK;
src->pending = 0;
IRQ_resetbit(&dst->raised, irq);
}
if ((irq >= opp->irq_ipi0) && (irq < (opp->irq_ipi0 + MAX_IPI))) {
src->destmask &= ~(1 << cpu);
if (src->destmask && !src->level) {
/* trigger on CPUs that didn't know about it yet */
openpic_set_irq(opp, irq, 1);
openpic_set_irq(opp, irq, 0);
/* if all CPUs knew about it, set active bit again */
src->ivpr |= IVPR_ACTIVITY_MASK;
}
}
return retval;
}
void kvmppc_mpic_set_epr(struct kvm_vcpu *vcpu)
{
struct openpic *opp = vcpu->arch.mpic;
int cpu = vcpu->arch.irq_cpu_id;
unsigned long flags;
spin_lock_irqsave(&opp->lock, flags);
if ((opp->gcr & opp->mpic_mode_mask) == GCR_MODE_PROXY)
kvmppc_set_epr(vcpu, openpic_iack(opp, &opp->dst[cpu], cpu));
spin_unlock_irqrestore(&opp->lock, flags);
}
static int openpic_cpu_read_internal(void *opaque, gpa_t addr,
u32 *ptr, int idx)
{
struct openpic *opp = opaque;
struct irq_dest *dst;
uint32_t retval;
pr_debug("%s: cpu %d addr %#llx\n", __func__, idx, addr);
retval = 0xFFFFFFFF;
if (idx < 0)
goto out;
if (addr & 0xF)
goto out;
dst = &opp->dst[idx];
addr &= 0xFF0;
switch (addr) {
case 0x80: /* CTPR */
retval = dst->ctpr;
break;
case 0x90: /* WHOAMI */
retval = idx;
break;
case 0xA0: /* IACK */
retval = openpic_iack(opp, dst, idx);
break;
case 0xB0: /* EOI */
retval = 0;
break;
default:
break;
}
pr_debug("%s: => 0x%08x\n", __func__, retval);
out:
*ptr = retval;
return 0;
}
static int openpic_cpu_read(void *opaque, gpa_t addr, u32 *ptr)
{
struct openpic *opp = opaque;
return openpic_cpu_read_internal(opp, addr, ptr,
(addr & 0x1f000) >> 12);
}
struct mem_reg {
int (*read)(void *opaque, gpa_t addr, u32 *ptr);
int (*write)(void *opaque, gpa_t addr, u32 val);
gpa_t start_addr;
int size;
};
static const struct mem_reg openpic_gbl_mmio = {
.write = openpic_gbl_write,
.read = openpic_gbl_read,
.start_addr = OPENPIC_GLB_REG_START,
.size = OPENPIC_GLB_REG_SIZE,
};
static const struct mem_reg openpic_tmr_mmio = {
.write = openpic_tmr_write,
.read = openpic_tmr_read,
.start_addr = OPENPIC_TMR_REG_START,
.size = OPENPIC_TMR_REG_SIZE,
};
static const struct mem_reg openpic_cpu_mmio = {
.write = openpic_cpu_write,
.read = openpic_cpu_read,
.start_addr = OPENPIC_CPU_REG_START,
.size = OPENPIC_CPU_REG_SIZE,
};
static const struct mem_reg openpic_src_mmio = {
.write = openpic_src_write,
.read = openpic_src_read,
.start_addr = OPENPIC_SRC_REG_START,
.size = OPENPIC_SRC_REG_SIZE,
};
static const struct mem_reg openpic_msi_mmio = {
.read = openpic_msi_read,
.write = openpic_msi_write,
.start_addr = OPENPIC_MSI_REG_START,
.size = OPENPIC_MSI_REG_SIZE,
};
static const struct mem_reg openpic_summary_mmio = {
.read = openpic_summary_read,
.write = openpic_summary_write,
.start_addr = OPENPIC_SUMMARY_REG_START,
.size = OPENPIC_SUMMARY_REG_SIZE,
};
static void add_mmio_region(struct openpic *opp, const struct mem_reg *mr)
{
if (opp->num_mmio_regions >= MAX_MMIO_REGIONS) {
WARN(1, "kvm mpic: too many mmio regions\n");
return;
}
opp->mmio_regions[opp->num_mmio_regions++] = mr;
}
static void fsl_common_init(struct openpic *opp)
{
int i;
int virq = MAX_SRC;
add_mmio_region(opp, &openpic_msi_mmio);
add_mmio_region(opp, &openpic_summary_mmio);
opp->vid = VID_REVISION_1_2;
opp->vir = VIR_GENERIC;
opp->vector_mask = 0xFFFF;
opp->tfrr_reset = 0;
opp->ivpr_reset = IVPR_MASK_MASK;
opp->idr_reset = 1 << 0;
opp->max_irq = MAX_IRQ;
opp->irq_ipi0 = virq;
virq += MAX_IPI;
opp->irq_tim0 = virq;
virq += MAX_TMR;
BUG_ON(virq > MAX_IRQ);
opp->irq_msi = 224;
for (i = 0; i < opp->fsl->max_ext; i++)
opp->src[i].level = false;
/* Internal interrupts, including message and MSI */
for (i = 16; i < MAX_SRC; i++) {
opp->src[i].type = IRQ_TYPE_FSLINT;
opp->src[i].level = true;
}
/* timers and IPIs */
for (i = MAX_SRC; i < virq; i++) {
opp->src[i].type = IRQ_TYPE_FSLSPECIAL;
opp->src[i].level = false;
}
}
static int kvm_mpic_read_internal(struct openpic *opp, gpa_t addr, u32 *ptr)
{
int i;
for (i = 0; i < opp->num_mmio_regions; i++) {
const struct mem_reg *mr = opp->mmio_regions[i];
if (mr->start_addr > addr || addr >= mr->start_addr + mr->size)
continue;
return mr->read(opp, addr - mr->start_addr, ptr);
}
return -ENXIO;
}
static int kvm_mpic_write_internal(struct openpic *opp, gpa_t addr, u32 val)
{
int i;
for (i = 0; i < opp->num_mmio_regions; i++) {
const struct mem_reg *mr = opp->mmio_regions[i];
if (mr->start_addr > addr || addr >= mr->start_addr + mr->size)
continue;
return mr->write(opp, addr - mr->start_addr, val);
}
return -ENXIO;
}
static int kvm_mpic_read(struct kvm_io_device *this, gpa_t addr,
int len, void *ptr)
{
struct openpic *opp = container_of(this, struct openpic, mmio);
int ret;
union {
u32 val;
u8 bytes[4];
} u;
if (addr & (len - 1)) {
pr_debug("%s: bad alignment %llx/%d\n",
__func__, addr, len);
return -EINVAL;
}
spin_lock_irq(&opp->lock);
ret = kvm_mpic_read_internal(opp, addr - opp->reg_base, &u.val);
spin_unlock_irq(&opp->lock);
/*
* Technically only 32-bit accesses are allowed, but be nice to
* people dumping registers a byte at a time -- it works in real
* hardware (reads only, not writes).
*/
if (len == 4) {
*(u32 *)ptr = u.val;
pr_debug("%s: addr %llx ret %d len 4 val %x\n",
__func__, addr, ret, u.val);
} else if (len == 1) {
*(u8 *)ptr = u.bytes[addr & 3];
pr_debug("%s: addr %llx ret %d len 1 val %x\n",
__func__, addr, ret, u.bytes[addr & 3]);
} else {
pr_debug("%s: bad length %d\n", __func__, len);
return -EINVAL;
}
return ret;
}
static int kvm_mpic_write(struct kvm_io_device *this, gpa_t addr,
int len, const void *ptr)
{
struct openpic *opp = container_of(this, struct openpic, mmio);
int ret;
if (len != 4) {
pr_debug("%s: bad length %d\n", __func__, len);
return -EOPNOTSUPP;
}
if (addr & 3) {
pr_debug("%s: bad alignment %llx/%d\n", __func__, addr, len);
return -EOPNOTSUPP;
}
spin_lock_irq(&opp->lock);
ret = kvm_mpic_write_internal(opp, addr - opp->reg_base,
*(const u32 *)ptr);
spin_unlock_irq(&opp->lock);
pr_debug("%s: addr %llx ret %d val %x\n",
__func__, addr, ret, *(const u32 *)ptr);
return ret;
}
static const struct kvm_io_device_ops mpic_mmio_ops = {
.read = kvm_mpic_read,
.write = kvm_mpic_write,
};
static void map_mmio(struct openpic *opp)
{
kvm_iodevice_init(&opp->mmio, &mpic_mmio_ops);
kvm_io_bus_register_dev(opp->kvm, KVM_MMIO_BUS,
opp->reg_base, OPENPIC_REG_SIZE,
&opp->mmio);
}
static void unmap_mmio(struct openpic *opp)
{
kvm_io_bus_unregister_dev(opp->kvm, KVM_MMIO_BUS, &opp->mmio);
}
static int set_base_addr(struct openpic *opp, struct kvm_device_attr *attr)
{
u64 base;
if (copy_from_user(&base, (u64 __user *)(long)attr->addr, sizeof(u64)))
return -EFAULT;
if (base & 0x3ffff) {
pr_debug("kvm mpic %s: KVM_DEV_MPIC_BASE_ADDR %08llx not aligned\n",
__func__, base);
return -EINVAL;
}
if (base == opp->reg_base)
return 0;
mutex_lock(&opp->kvm->slots_lock);
unmap_mmio(opp);
opp->reg_base = base;
pr_debug("kvm mpic %s: KVM_DEV_MPIC_BASE_ADDR %08llx\n",
__func__, base);
if (base == 0)
goto out;
map_mmio(opp);
out:
mutex_unlock(&opp->kvm->slots_lock);
return 0;
}
#define ATTR_SET 0
#define ATTR_GET 1
static int access_reg(struct openpic *opp, gpa_t addr, u32 *val, int type)
{
int ret;
if (addr & 3)
return -ENXIO;
spin_lock_irq(&opp->lock);
if (type == ATTR_SET)
ret = kvm_mpic_write_internal(opp, addr, *val);
else
ret = kvm_mpic_read_internal(opp, addr, val);
spin_unlock_irq(&opp->lock);
pr_debug("%s: type %d addr %llx val %x\n", __func__, type, addr, *val);
return ret;
}
static int mpic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
struct openpic *opp = dev->private;
u32 attr32;
switch (attr->group) {
case KVM_DEV_MPIC_GRP_MISC:
switch (attr->attr) {
case KVM_DEV_MPIC_BASE_ADDR:
return set_base_addr(opp, attr);
}
break;
case KVM_DEV_MPIC_GRP_REGISTER:
if (get_user(attr32, (u32 __user *)(long)attr->addr))
return -EFAULT;
return access_reg(opp, attr->attr, &attr32, ATTR_SET);
case KVM_DEV_MPIC_GRP_IRQ_ACTIVE:
if (attr->attr > MAX_SRC)
return -EINVAL;
if (get_user(attr32, (u32 __user *)(long)attr->addr))
return -EFAULT;
if (attr32 != 0 && attr32 != 1)
return -EINVAL;
spin_lock_irq(&opp->lock);
openpic_set_irq(opp, attr->attr, attr32);
spin_unlock_irq(&opp->lock);
return 0;
}
return -ENXIO;
}
static int mpic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
struct openpic *opp = dev->private;
u64 attr64;
u32 attr32;
int ret;
switch (attr->group) {
case KVM_DEV_MPIC_GRP_MISC:
switch (attr->attr) {
case KVM_DEV_MPIC_BASE_ADDR:
mutex_lock(&opp->kvm->slots_lock);
attr64 = opp->reg_base;
mutex_unlock(&opp->kvm->slots_lock);
if (copy_to_user((u64 __user *)(long)attr->addr,
&attr64, sizeof(u64)))
return -EFAULT;
return 0;
}
break;
case KVM_DEV_MPIC_GRP_REGISTER:
ret = access_reg(opp, attr->attr, &attr32, ATTR_GET);
if (ret)
return ret;
if (put_user(attr32, (u32 __user *)(long)attr->addr))
return -EFAULT;
return 0;
case KVM_DEV_MPIC_GRP_IRQ_ACTIVE:
if (attr->attr > MAX_SRC)
return -EINVAL;
spin_lock_irq(&opp->lock);
attr32 = opp->src[attr->attr].pending;
spin_unlock_irq(&opp->lock);
if (put_user(attr32, (u32 __user *)(long)attr->addr))
return -EFAULT;
return 0;
}
return -ENXIO;
}
static int mpic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
switch (attr->group) {
case KVM_DEV_MPIC_GRP_MISC:
switch (attr->attr) {
case KVM_DEV_MPIC_BASE_ADDR:
return 0;
}
break;
case KVM_DEV_MPIC_GRP_REGISTER:
return 0;
case KVM_DEV_MPIC_GRP_IRQ_ACTIVE:
if (attr->attr > MAX_SRC)
break;
return 0;
}
return -ENXIO;
}
static void mpic_destroy(struct kvm_device *dev)
{
struct openpic *opp = dev->private;
dev->kvm->arch.mpic = NULL;
kfree(opp);
kfree(dev);
}
static int mpic_set_default_irq_routing(struct openpic *opp)
{
struct kvm_irq_routing_entry *routing;
/* Create a nop default map, so that dereferencing it still works */
routing = kzalloc((sizeof(*routing)), GFP_KERNEL);
if (!routing)
return -ENOMEM;
kvm_set_irq_routing(opp->kvm, routing, 0, 0);
kfree(routing);
return 0;
}
static int mpic_create(struct kvm_device *dev, u32 type)
{
struct openpic *opp;
int ret;
/* We only support one MPIC at a time for now */
if (dev->kvm->arch.mpic)
return -EINVAL;
opp = kzalloc(sizeof(struct openpic), GFP_KERNEL);
if (!opp)
return -ENOMEM;
dev->private = opp;
opp->kvm = dev->kvm;
opp->dev = dev;
opp->model = type;
spin_lock_init(&opp->lock);
add_mmio_region(opp, &openpic_gbl_mmio);
add_mmio_region(opp, &openpic_tmr_mmio);
add_mmio_region(opp, &openpic_src_mmio);
add_mmio_region(opp, &openpic_cpu_mmio);
switch (opp->model) {
case KVM_DEV_TYPE_FSL_MPIC_20:
opp->fsl = &fsl_mpic_20;
opp->brr1 = 0x00400200;
opp->flags |= OPENPIC_FLAG_IDR_CRIT;
opp->nb_irqs = 80;
opp->mpic_mode_mask = GCR_MODE_MIXED;
fsl_common_init(opp);
break;
case KVM_DEV_TYPE_FSL_MPIC_42:
opp->fsl = &fsl_mpic_42;
opp->brr1 = 0x00400402;
opp->flags |= OPENPIC_FLAG_ILR;
opp->nb_irqs = 196;
opp->mpic_mode_mask = GCR_MODE_PROXY;
fsl_common_init(opp);
break;
default:
ret = -ENODEV;
goto err;
}
ret = mpic_set_default_irq_routing(opp);
if (ret)
goto err;
openpic_reset(opp);
smp_wmb();
dev->kvm->arch.mpic = opp;
return 0;
err:
kfree(opp);
return ret;
}
struct kvm_device_ops kvm_mpic_ops = {
.name = "kvm-mpic",
.create = mpic_create,
.destroy = mpic_destroy,
.set_attr = mpic_set_attr,
.get_attr = mpic_get_attr,
.has_attr = mpic_has_attr,
};
int kvmppc_mpic_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
u32 cpu)
{
struct openpic *opp = dev->private;
int ret = 0;
if (dev->ops != &kvm_mpic_ops)
return -EPERM;
if (opp->kvm != vcpu->kvm)
return -EPERM;
if (cpu < 0 || cpu >= MAX_CPU)
return -EPERM;
spin_lock_irq(&opp->lock);
if (opp->dst[cpu].vcpu) {
ret = -EEXIST;
goto out;
}
if (vcpu->arch.irq_type) {
ret = -EBUSY;
goto out;
}
opp->dst[cpu].vcpu = vcpu;
opp->nb_cpus = max(opp->nb_cpus, cpu + 1);
vcpu->arch.mpic = opp;
vcpu->arch.irq_cpu_id = cpu;
vcpu->arch.irq_type = KVMPPC_IRQ_MPIC;
/* This might need to be changed if GCR gets extended */
if (opp->mpic_mode_mask == GCR_MODE_PROXY)
vcpu->arch.epr_flags |= KVMPPC_EPR_KERNEL;
out:
spin_unlock_irq(&opp->lock);
return ret;
}
/*
* This should only happen immediately before the mpic is destroyed,
* so we shouldn't need to worry about anything still trying to
* access the vcpu pointer.
*/
void kvmppc_mpic_disconnect_vcpu(struct openpic *opp, struct kvm_vcpu *vcpu)
{
BUG_ON(!opp->dst[vcpu->arch.irq_cpu_id].vcpu);
opp->dst[vcpu->arch.irq_cpu_id].vcpu = NULL;
}
/*
* Return value:
* < 0 Interrupt was ignored (masked or not delivered for other reasons)
* = 0 Interrupt was coalesced (previous irq is still pending)
* > 0 Number of CPUs interrupt was delivered to
*/
static int mpic_set_irq(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level,
bool line_status)
{
u32 irq = e->irqchip.pin;
struct openpic *opp = kvm->arch.mpic;
unsigned long flags;
spin_lock_irqsave(&opp->lock, flags);
openpic_set_irq(opp, irq, level);
spin_unlock_irqrestore(&opp->lock, flags);
/* All code paths we care about don't check for the return value */
return 0;
}
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level, bool line_status)
{
struct openpic *opp = kvm->arch.mpic;
unsigned long flags;
spin_lock_irqsave(&opp->lock, flags);
/*
* XXX We ignore the target address for now, as we only support
* a single MSI bank.
*/
openpic_msi_write(kvm->arch.mpic, MSIIR_OFFSET, e->msi.data);
spin_unlock_irqrestore(&opp->lock, flags);
/* All code paths we care about don't check for the return value */
return 0;
}
int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
const struct kvm_irq_routing_entry *ue)
{
int r = -EINVAL;
switch (ue->type) {
case KVM_IRQ_ROUTING_IRQCHIP:
e->set = mpic_set_irq;
e->irqchip.irqchip = ue->u.irqchip.irqchip;
e->irqchip.pin = ue->u.irqchip.pin;
if (e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS)
goto out;
break;
case KVM_IRQ_ROUTING_MSI:
e->set = kvm_set_msi;
e->msi.address_lo = ue->u.msi.address_lo;
e->msi.address_hi = ue->u.msi.address_hi;
e->msi.data = ue->u.msi.data;
break;
default:
goto out;
}
r = 0;
out:
return r;
}
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