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qemu-irix/hw/xics.c

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/*
* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
*
* PAPR Virtualized Interrupt System, aka ICS/ICP aka xics
*
* Copyright (c) 2010,2011 David Gibson, IBM Corporation.
*
* 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 "hw.h"
#include "hw/spapr.h"
#include "hw/xics.h"
/*
* ICP: Presentation layer
*/
struct icp_server_state {
uint32_t xirr;
uint8_t pending_priority;
uint8_t mfrr;
qemu_irq output;
};
#define XISR_MASK 0x00ffffff
#define CPPR_MASK 0xff000000
#define XISR(ss) (((ss)->xirr) & XISR_MASK)
#define CPPR(ss) (((ss)->xirr) >> 24)
struct ics_state;
struct icp_state {
long nr_servers;
struct icp_server_state *ss;
struct ics_state *ics;
};
static void ics_reject(struct ics_state *ics, int nr);
static void ics_resend(struct ics_state *ics);
static void ics_eoi(struct ics_state *ics, int nr);
static void icp_check_ipi(struct icp_state *icp, int server)
{
struct icp_server_state *ss = icp->ss + server;
if (XISR(ss) && (ss->pending_priority <= ss->mfrr)) {
return;
}
if (XISR(ss)) {
ics_reject(icp->ics, XISR(ss));
}
ss->xirr = (ss->xirr & ~XISR_MASK) | XICS_IPI;
ss->pending_priority = ss->mfrr;
qemu_irq_raise(ss->output);
}
static void icp_resend(struct icp_state *icp, int server)
{
struct icp_server_state *ss = icp->ss + server;
if (ss->mfrr < CPPR(ss)) {
icp_check_ipi(icp, server);
}
ics_resend(icp->ics);
}
static void icp_set_cppr(struct icp_state *icp, int server, uint8_t cppr)
{
struct icp_server_state *ss = icp->ss + server;
uint8_t old_cppr;
uint32_t old_xisr;
old_cppr = CPPR(ss);
ss->xirr = (ss->xirr & ~CPPR_MASK) | (cppr << 24);
if (cppr < old_cppr) {
if (XISR(ss) && (cppr <= ss->pending_priority)) {
old_xisr = XISR(ss);
ss->xirr &= ~XISR_MASK; /* Clear XISR */
qemu_irq_lower(ss->output);
ics_reject(icp->ics, old_xisr);
}
} else {
if (!XISR(ss)) {
icp_resend(icp, server);
}
}
}
static void icp_set_mfrr(struct icp_state *icp, int nr, uint8_t mfrr)
{
struct icp_server_state *ss = icp->ss + nr;
ss->mfrr = mfrr;
if (mfrr < CPPR(ss)) {
icp_check_ipi(icp, nr);
}
}
static uint32_t icp_accept(struct icp_server_state *ss)
{
uint32_t xirr;
qemu_irq_lower(ss->output);
xirr = ss->xirr;
ss->xirr = ss->pending_priority << 24;
return xirr;
}
static void icp_eoi(struct icp_state *icp, int server, uint32_t xirr)
{
struct icp_server_state *ss = icp->ss + server;
ics_eoi(icp->ics, xirr & XISR_MASK);
/* Send EOI -> ICS */
ss->xirr = (ss->xirr & ~CPPR_MASK) | (xirr & CPPR_MASK);
if (!XISR(ss)) {
icp_resend(icp, server);
}
}
static void icp_irq(struct icp_state *icp, int server, int nr, uint8_t priority)
{
struct icp_server_state *ss = icp->ss + server;
if ((priority >= CPPR(ss))
|| (XISR(ss) && (ss->pending_priority <= priority))) {
ics_reject(icp->ics, nr);
} else {
if (XISR(ss)) {
ics_reject(icp->ics, XISR(ss));
}
ss->xirr = (ss->xirr & ~XISR_MASK) | (nr & XISR_MASK);
ss->pending_priority = priority;
qemu_irq_raise(ss->output);
}
}
/*
* ICS: Source layer
*/
struct ics_irq_state {
int server;
uint8_t priority;
uint8_t saved_priority;
/* int pending:1; */
/* int presented:1; */
int rejected:1;
int masked_pending:1;
};
struct ics_state {
int nr_irqs;
int offset;
qemu_irq *qirqs;
struct ics_irq_state *irqs;
struct icp_state *icp;
};
static int ics_valid_irq(struct ics_state *ics, uint32_t nr)
{
return (nr >= ics->offset)
&& (nr < (ics->offset + ics->nr_irqs));
}
static void ics_set_irq_msi(void *opaque, int srcno, int val)
{
struct ics_state *ics = (struct ics_state *)opaque;
struct ics_irq_state *irq = ics->irqs + srcno;
if (val) {
if (irq->priority == 0xff) {
irq->masked_pending = 1;
/* masked pending */ ;
} else {
icp_irq(ics->icp, irq->server, srcno + ics->offset, irq->priority);
}
}
}
static void ics_reject_msi(struct ics_state *ics, int nr)
{
struct ics_irq_state *irq = ics->irqs + nr - ics->offset;
irq->rejected = 1;
}
static void ics_resend_msi(struct ics_state *ics)
{
int i;
for (i = 0; i < ics->nr_irqs; i++) {
struct ics_irq_state *irq = ics->irqs + i;
/* FIXME: filter by server#? */
if (irq->rejected) {
irq->rejected = 0;
if (irq->priority != 0xff) {
icp_irq(ics->icp, irq->server, i + ics->offset, irq->priority);
}
}
}
}
static void ics_write_xive_msi(struct ics_state *ics, int nr, int server,
uint8_t priority)
{
struct ics_irq_state *irq = ics->irqs + nr - ics->offset;
irq->server = server;
irq->priority = priority;
if (!irq->masked_pending || (priority == 0xff)) {
return;
}
irq->masked_pending = 0;
icp_irq(ics->icp, server, nr, priority);
}
static void ics_reject(struct ics_state *ics, int nr)
{
ics_reject_msi(ics, nr);
}
static void ics_resend(struct ics_state *ics)
{
ics_resend_msi(ics);
}
static void ics_eoi(struct ics_state *ics, int nr)
{
}
/*
* Exported functions
*/
qemu_irq xics_find_qirq(struct icp_state *icp, int irq)
{
if ((irq < icp->ics->offset)
|| (irq >= (icp->ics->offset + icp->ics->nr_irqs))) {
return NULL;
}
return icp->ics->qirqs[irq - icp->ics->offset];
}
static target_ulong h_cppr(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong cppr = args[0];
icp_set_cppr(spapr->icp, env->cpu_index, cppr);
return H_SUCCESS;
}
static target_ulong h_ipi(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong server = args[0];
target_ulong mfrr = args[1];
if (server >= spapr->icp->nr_servers) {
return H_PARAMETER;
}
icp_set_mfrr(spapr->icp, server, mfrr);
return H_SUCCESS;
}
static target_ulong h_xirr(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
uint32_t xirr = icp_accept(spapr->icp->ss + env->cpu_index);
args[0] = xirr;
return H_SUCCESS;
}
static target_ulong h_eoi(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong xirr = args[0];
icp_eoi(spapr->icp, env->cpu_index, xirr);
return H_SUCCESS;
}
static void rtas_set_xive(sPAPREnvironment *spapr, uint32_t token,
uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
struct ics_state *ics = spapr->icp->ics;
uint32_t nr, server, priority;
if ((nargs != 3) || (nret != 1)) {
rtas_st(rets, 0, -3);
return;
}
nr = rtas_ld(args, 0);
server = rtas_ld(args, 1);
priority = rtas_ld(args, 2);
if (!ics_valid_irq(ics, nr) || (server >= ics->icp->nr_servers)
|| (priority > 0xff)) {
rtas_st(rets, 0, -3);
return;
}
ics_write_xive_msi(ics, nr, server, priority);
rtas_st(rets, 0, 0); /* Success */
}
static void rtas_get_xive(sPAPREnvironment *spapr, uint32_t token,
uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
struct ics_state *ics = spapr->icp->ics;
uint32_t nr;
if ((nargs != 1) || (nret != 3)) {
rtas_st(rets, 0, -3);
return;
}
nr = rtas_ld(args, 0);
if (!ics_valid_irq(ics, nr)) {
rtas_st(rets, 0, -3);
return;
}
rtas_st(rets, 0, 0); /* Success */
rtas_st(rets, 1, ics->irqs[nr - ics->offset].server);
rtas_st(rets, 2, ics->irqs[nr - ics->offset].priority);
}
static void rtas_int_off(sPAPREnvironment *spapr, uint32_t token,
uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
struct ics_state *ics = spapr->icp->ics;
uint32_t nr;
if ((nargs != 1) || (nret != 1)) {
rtas_st(rets, 0, -3);
return;
}
nr = rtas_ld(args, 0);
if (!ics_valid_irq(ics, nr)) {
rtas_st(rets, 0, -3);
return;
}
/* This is a NOP for now, since the described PAPR semantics don't
* seem to gel with what Linux does */
#if 0
struct ics_irq_state *irq = xics->irqs + (nr - xics->offset);
irq->saved_priority = irq->priority;
ics_write_xive_msi(xics, nr, irq->server, 0xff);
#endif
rtas_st(rets, 0, 0); /* Success */
}
static void rtas_int_on(sPAPREnvironment *spapr, uint32_t token,
uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
struct ics_state *ics = spapr->icp->ics;
uint32_t nr;
if ((nargs != 1) || (nret != 1)) {
rtas_st(rets, 0, -3);
return;
}
nr = rtas_ld(args, 0);
if (!ics_valid_irq(ics, nr)) {
rtas_st(rets, 0, -3);
return;
}
/* This is a NOP for now, since the described PAPR semantics don't
* seem to gel with what Linux does */
#if 0
struct ics_irq_state *irq = xics->irqs + (nr - xics->offset);
ics_write_xive_msi(xics, nr, irq->server, irq->saved_priority);
#endif
rtas_st(rets, 0, 0); /* Success */
}
struct icp_state *xics_system_init(int nr_irqs)
{
CPUState *env;
int max_server_num;
int i;
struct icp_state *icp;
struct ics_state *ics;
max_server_num = -1;
for (env = first_cpu; env != NULL; env = env->next_cpu) {
if (env->cpu_index > max_server_num) {
max_server_num = env->cpu_index;
}
}
icp = g_malloc0(sizeof(*icp));
icp->nr_servers = max_server_num + 1;
icp->ss = g_malloc0(icp->nr_servers*sizeof(struct icp_server_state));
for (i = 0; i < icp->nr_servers; i++) {
icp->ss[i].mfrr = 0xff;
}
for (env = first_cpu; env != NULL; env = env->next_cpu) {
struct icp_server_state *ss = &icp->ss[env->cpu_index];
switch (PPC_INPUT(env)) {
case PPC_FLAGS_INPUT_POWER7:
ss->output = env->irq_inputs[POWER7_INPUT_INT];
break;
case PPC_FLAGS_INPUT_970:
ss->output = env->irq_inputs[PPC970_INPUT_INT];
break;
default:
hw_error("XICS interrupt model does not support this CPU bus "
"model\n");
exit(1);
}
}
ics = g_malloc0(sizeof(*ics));
ics->nr_irqs = nr_irqs;
ics->offset = 16;
ics->irqs = g_malloc0(nr_irqs * sizeof(struct ics_irq_state));
icp->ics = ics;
ics->icp = icp;
for (i = 0; i < nr_irqs; i++) {
ics->irqs[i].priority = 0xff;
ics->irqs[i].saved_priority = 0xff;
}
ics->qirqs = qemu_allocate_irqs(ics_set_irq_msi, ics, nr_irqs);
spapr_register_hypercall(H_CPPR, h_cppr);
spapr_register_hypercall(H_IPI, h_ipi);
spapr_register_hypercall(H_XIRR, h_xirr);
spapr_register_hypercall(H_EOI, h_eoi);
spapr_rtas_register("ibm,set-xive", rtas_set_xive);
spapr_rtas_register("ibm,get-xive", rtas_get_xive);
spapr_rtas_register("ibm,int-off", rtas_int_off);
spapr_rtas_register("ibm,int-on", rtas_int_on);
return icp;
}
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