pseries: move interrupt controllers to hw/intc/

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 588 insertions, 0 deletions

diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs
index 86f9d5b..2851eed 100644
--- a/hw/intc/Makefile.objs
+++ b/hw/intc/Makefile.objs
@@ -22,3 +22,4 @@ obj-$(CONFIG_IOAPIC) += ioapic.o
 obj-$(CONFIG_OMAP) += omap_intc.o
 obj-$(CONFIG_OPENPIC_KVM) += openpic_kvm.o
 obj-$(CONFIG_SH4) += sh_intc.o
+obj-$(CONFIG_XICS) += xics.o
diff --git a/hw/intc/xics.c b/hw/intc/xics.c
new file mode 100644
index 0000000..091912e
--- /dev/null
+++ b/hw/intc/xics.c
@@ -0,0 +1,587 @@
+/*
+ * 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/hw.h"
+#include "trace.h"
+#include "hw/ppc/spapr.h"
+#include "hw/ppc/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;
+    }
+
+    trace_xics_icp_check_ipi(server, ss->mfrr);
+
+    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 */
+            ss->pending_priority = 0xff;
+            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 server, uint8_t mfrr)
+{
+    struct icp_server_state *ss = icp->ss + server;
+
+    ss->mfrr = mfrr;
+    if (mfrr < CPPR(ss)) {
+        icp_check_ipi(icp, server);
+    }
+}
+
+static uint32_t icp_accept(struct icp_server_state *ss)
+{
+    uint32_t xirr = ss->xirr;
+
+    qemu_irq_lower(ss->output);
+    ss->xirr = ss->pending_priority << 24;
+    ss->pending_priority = 0xff;
+
+    trace_xics_icp_accept(xirr, ss->xirr);
+
+    return xirr;
+}
+
+static void icp_eoi(struct icp_state *icp, int server, uint32_t xirr)
+{
+    struct icp_server_state *ss = icp->ss + server;
+
+    /* Send EOI -> ICS */
+    ss->xirr = (ss->xirr & ~CPPR_MASK) | (xirr & CPPR_MASK);
+    trace_xics_icp_eoi(server, xirr, ss->xirr);
+    ics_eoi(icp->ics, xirr & XISR_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;
+
+    trace_xics_icp_irq(server, nr, priority);
+
+    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;
+        trace_xics_icp_raise(ss->xirr, ss->pending_priority);
+        qemu_irq_raise(ss->output);
+    }
+}
+
+/*
+ * ICS: Source layer
+ */
+
+struct ics_irq_state {
+    int server;
+    uint8_t priority;
+    uint8_t saved_priority;
+#define XICS_STATUS_ASSERTED           0x1
+#define XICS_STATUS_SENT               0x2
+#define XICS_STATUS_REJECTED           0x4
+#define XICS_STATUS_MASKED_PENDING     0x8
+    uint8_t status;
+};
+
+struct ics_state {
+    int nr_irqs;
+    int offset;
+    qemu_irq *qirqs;
+    bool *islsi;
+    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 resend_msi(struct ics_state *ics, int srcno)
+{
+    struct ics_irq_state *irq = ics->irqs + srcno;
+
+    /* FIXME: filter by server#? */
+    if (irq->status & XICS_STATUS_REJECTED) {
+        irq->status &= ~XICS_STATUS_REJECTED;
+        if (irq->priority != 0xff) {
+            icp_irq(ics->icp, irq->server, srcno + ics->offset,
+                    irq->priority);
+        }
+    }
+}
+
+static void resend_lsi(struct ics_state *ics, int srcno)
+{
+    struct ics_irq_state *irq = ics->irqs + srcno;
+
+    if ((irq->priority != 0xff)
+        && (irq->status & XICS_STATUS_ASSERTED)
+        && !(irq->status & XICS_STATUS_SENT)) {
+        irq->status |= XICS_STATUS_SENT;
+        icp_irq(ics->icp, irq->server, srcno + ics->offset, irq->priority);
+    }
+}
+
+static void set_irq_msi(struct ics_state *ics, int srcno, int val)
+{
+    struct ics_irq_state *irq = ics->irqs + srcno;
+
+    trace_xics_set_irq_msi(srcno, srcno + ics->offset);
+
+    if (val) {
+        if (irq->priority == 0xff) {
+            irq->status |= XICS_STATUS_MASKED_PENDING;
+            trace_xics_masked_pending();
+        } else  {
+            icp_irq(ics->icp, irq->server, srcno + ics->offset, irq->priority);
+        }
+    }
+}
+
+static void set_irq_lsi(struct ics_state *ics, int srcno, int val)
+{
+    struct ics_irq_state *irq = ics->irqs + srcno;
+
+    trace_xics_set_irq_lsi(srcno, srcno + ics->offset);
+    if (val) {
+        irq->status |= XICS_STATUS_ASSERTED;
+    } else {
+        irq->status &= ~XICS_STATUS_ASSERTED;
+    }
+    resend_lsi(ics, srcno);
+}
+
+static void ics_set_irq(void *opaque, int srcno, int val)
+{
+    struct ics_state *ics = (struct ics_state *)opaque;
+
+    if (ics->islsi[srcno]) {
+        set_irq_lsi(ics, srcno, val);
+    } else {
+        set_irq_msi(ics, srcno, val);
+    }
+}
+
+static void write_xive_msi(struct ics_state *ics, int srcno)
+{
+    struct ics_irq_state *irq = ics->irqs + srcno;
+
+    if (!(irq->status & XICS_STATUS_MASKED_PENDING)
+        || (irq->priority == 0xff)) {
+        return;
+    }
+
+    irq->status &= ~XICS_STATUS_MASKED_PENDING;
+    icp_irq(ics->icp, irq->server, srcno + ics->offset, irq->priority);
+}
+
+static void write_xive_lsi(struct ics_state *ics, int srcno)
+{
+    resend_lsi(ics, srcno);
+}
+
+static void ics_write_xive(struct ics_state *ics, int nr, int server,
+                           uint8_t priority, uint8_t saved_priority)
+{
+    int srcno = nr - ics->offset;
+    struct ics_irq_state *irq = ics->irqs + srcno;
+
+    irq->server = server;
+    irq->priority = priority;
+    irq->saved_priority = saved_priority;
+
+    trace_xics_ics_write_xive(nr, srcno, server, priority);
+
+    if (ics->islsi[srcno]) {
+        write_xive_lsi(ics, srcno);
+    } else {
+        write_xive_msi(ics, srcno);
+    }
+}
+
+static void ics_reject(struct ics_state *ics, int nr)
+{
+    struct ics_irq_state *irq = ics->irqs + nr - ics->offset;
+
+    trace_xics_ics_reject(nr, nr - ics->offset);
+    irq->status |= XICS_STATUS_REJECTED; /* Irrelevant but harmless for LSI */
+    irq->status &= ~XICS_STATUS_SENT; /* Irrelevant but harmless for MSI */
+}
+
+static void ics_resend(struct ics_state *ics)
+{
+    int i;
+
+    for (i = 0; i < ics->nr_irqs; i++) {
+        /* FIXME: filter by server#? */
+        if (ics->islsi[i]) {
+            resend_lsi(ics, i);
+        } else {
+            resend_msi(ics, i);
+        }
+    }
+}
+
+static void ics_eoi(struct ics_state *ics, int nr)
+{
+    int srcno = nr - ics->offset;
+    struct ics_irq_state *irq = ics->irqs + srcno;
+
+    trace_xics_ics_eoi(nr);
+
+    if (ics->islsi[srcno]) {
+        irq->status &= ~XICS_STATUS_SENT;
+    }
+}
+
+/*
+ * Exported functions
+ */
+
+qemu_irq xics_get_qirq(struct icp_state *icp, int irq)
+{
+    if (!ics_valid_irq(icp->ics, irq)) {
+        return NULL;
+    }
+
+    return icp->ics->qirqs[irq - icp->ics->offset];
+}
+
+void xics_set_irq_type(struct icp_state *icp, int irq, bool lsi)
+{
+    assert(ics_valid_irq(icp->ics, irq));
+
+    icp->ics->islsi[irq - icp->ics->offset] = lsi;
+}
+
+static target_ulong h_cppr(PowerPCCPU *cpu, sPAPREnvironment *spapr,
+                           target_ulong opcode, target_ulong *args)
+{
+    CPUState *cs = CPU(cpu);
+    target_ulong cppr = args[0];
+
+    icp_set_cppr(spapr->icp, cs->cpu_index, cppr);
+    return H_SUCCESS;
+}
+
+static target_ulong h_ipi(PowerPCCPU *cpu, 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(PowerPCCPU *cpu, sPAPREnvironment *spapr,
+                           target_ulong opcode, target_ulong *args)
+{
+    CPUState *cs = CPU(cpu);
+    uint32_t xirr = icp_accept(spapr->icp->ss + cs->cpu_index);
+
+    args[0] = xirr;
+    return H_SUCCESS;
+}
+
+static target_ulong h_eoi(PowerPCCPU *cpu, sPAPREnvironment *spapr,
+                          target_ulong opcode, target_ulong *args)
+{
+    CPUState *cs = CPU(cpu);
+    target_ulong xirr = args[0];
+
+    icp_eoi(spapr->icp, cs->cpu_index, xirr);
+    return H_SUCCESS;
+}
+
+static void rtas_set_xive(PowerPCCPU *cpu, 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(ics, nr, server, priority, priority);
+
+    rtas_st(rets, 0, 0); /* Success */
+}
+
+static void rtas_get_xive(PowerPCCPU *cpu, 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(PowerPCCPU *cpu, 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;
+    }
+
+    ics_write_xive(ics, nr, ics->irqs[nr - ics->offset].server, 0xff,
+                   ics->irqs[nr - ics->offset].priority);
+
+    rtas_st(rets, 0, 0); /* Success */
+}
+
+static void rtas_int_on(PowerPCCPU *cpu, 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;
+    }
+
+    ics_write_xive(ics, nr, ics->irqs[nr - ics->offset].server,
+                   ics->irqs[nr - ics->offset].saved_priority,
+                   ics->irqs[nr - ics->offset].saved_priority);
+
+    rtas_st(rets, 0, 0); /* Success */
+}
+
+static void xics_reset(void *opaque)
+{
+    struct icp_state *icp = (struct icp_state *)opaque;
+    struct ics_state *ics = icp->ics;
+    int i;
+
+    for (i = 0; i < icp->nr_servers; i++) {
+        icp->ss[i].xirr = 0;
+        icp->ss[i].pending_priority = 0xff;
+        icp->ss[i].mfrr = 0xff;
+        /* Make all outputs are deasserted */
+        qemu_set_irq(icp->ss[i].output, 0);
+    }
+
+    memset(ics->irqs, 0, sizeof(struct ics_irq_state) * ics->nr_irqs);
+    for (i = 0; i < ics->nr_irqs; i++) {
+        ics->irqs[i].priority = 0xff;
+        ics->irqs[i].saved_priority = 0xff;
+    }
+}
+
+void xics_cpu_setup(struct icp_state *icp, PowerPCCPU *cpu)
+{
+    CPUState *cs = CPU(cpu);
+    CPUPPCState *env = &cpu->env;
+    struct icp_server_state *ss = &icp->ss[cs->cpu_index];
+
+    assert(cs->cpu_index < icp->nr_servers);
+
+    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:
+        fprintf(stderr, "XICS interrupt controller does not support this CPU "
+                "bus model\n");
+        abort();
+    }
+}
+
+struct icp_state *xics_system_init(int nr_servers, int nr_irqs)
+{
+    struct icp_state *icp;
+    struct ics_state *ics;
+
+    icp = g_malloc0(sizeof(*icp));
+    icp->nr_servers = nr_servers;
+    icp->ss = g_malloc0(icp->nr_servers*sizeof(struct icp_server_state));
+
+    ics = g_malloc0(sizeof(*ics));
+    ics->nr_irqs = nr_irqs;
+    ics->offset = XICS_IRQ_BASE;
+    ics->irqs = g_malloc0(nr_irqs * sizeof(struct ics_irq_state));
+    ics->islsi = g_malloc0(nr_irqs * sizeof(bool));
+
+    icp->ics = ics;
+    ics->icp = icp;
+
+    ics->qirqs = qemu_allocate_irqs(ics_set_irq, 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);
+
+    qemu_register_reset(xics_reset, icp);
+
+    return icp;
+}