ppc/pnv: add a PnvICPState object

This provides a new ICPState object for the PowerNV machine (POWER8).
Access to the Interrupt Management area is done though a memory
region. It contains the registers of the Interrupt Control Presenters
of each thread which are used to accept, return, forward interrupts in
the system.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

2 files changed, 193 insertions, 0 deletions

diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs
index adedd0da5f..78426a7daf 100644
--- a/hw/intc/Makefile.objs
+++ b/hw/intc/Makefile.objs
@@ -35,6 +35,7 @@ obj-$(CONFIG_SH4) += sh_intc.o
 obj-$(CONFIG_XICS) += xics.o
 obj-$(CONFIG_XICS_SPAPR) += xics_spapr.o
 obj-$(CONFIG_XICS_KVM) += xics_kvm.o
+obj-$(CONFIG_POWERNV) += xics_pnv.o
 obj-$(CONFIG_ALLWINNER_A10_PIC) += allwinner-a10-pic.o
 obj-$(CONFIG_S390_FLIC) += s390_flic.o
 obj-$(CONFIG_S390_FLIC_KVM) += s390_flic_kvm.o
diff --git a/hw/intc/xics_pnv.c b/hw/intc/xics_pnv.c
new file mode 100644
index 0000000000..12ae605f10
--- /dev/null
+++ b/hw/intc/xics_pnv.c
@@ -0,0 +1,192 @@
+/*
+ * QEMU PowerPC PowerNV Interrupt Control Presenter (ICP) model
+ *
+ * Copyright (c) 2017, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/sysemu.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
+#include "hw/ppc/xics.h"
+
+#define ICP_XIRR_POLL    0 /* 1 byte (CPRR) or 4 bytes */
+#define ICP_XIRR         4 /* 1 byte (CPRR) or 4 bytes */
+#define ICP_MFRR        12 /* 1 byte access only */
+
+#define ICP_LINKA       16 /* unused */
+#define ICP_LINKB       20 /* unused */
+#define ICP_LINKC       24 /* unused */
+
+static uint64_t pnv_icp_read(void *opaque, hwaddr addr, unsigned width)
+{
+    ICPState *icp = ICP(opaque);
+    PnvICPState *picp = PNV_ICP(opaque);
+    bool byte0 = (width == 1 && (addr & 0x3) == 0);
+    uint64_t val = 0xffffffff;
+
+    switch (addr & 0xffc) {
+    case ICP_XIRR_POLL:
+        val = icp_ipoll(icp, NULL);
+        if (byte0) {
+            val >>= 24;
+        } else if (width != 4) {
+            goto bad_access;
+        }
+        break;
+    case ICP_XIRR:
+        if (byte0) {
+            val = icp_ipoll(icp, NULL) >> 24;
+        } else if (width == 4) {
+            val = icp_accept(icp);
+        } else {
+            goto bad_access;
+        }
+        break;
+    case ICP_MFRR:
+        if (byte0) {
+            val = icp->mfrr;
+        } else {
+            goto bad_access;
+        }
+        break;
+    case ICP_LINKA:
+        if (width == 4) {
+            val = picp->links[0];
+        } else {
+            goto bad_access;
+        }
+        break;
+    case ICP_LINKB:
+        if (width == 4) {
+            val = picp->links[1];
+        } else {
+            goto bad_access;
+        }
+        break;
+    case ICP_LINKC:
+        if (width == 4) {
+            val = picp->links[2];
+        } else {
+            goto bad_access;
+        }
+        break;
+    default:
+bad_access:
+        qemu_log_mask(LOG_GUEST_ERROR, "XICS: Bad ICP access 0x%"
+                      HWADDR_PRIx"/%d\n", addr, width);
+    }
+
+    return val;
+}
+
+static void pnv_icp_write(void *opaque, hwaddr addr, uint64_t val,
+                              unsigned width)
+{
+    ICPState *icp = ICP(opaque);
+    PnvICPState *picp = PNV_ICP(opaque);
+    bool byte0 = (width == 1 && (addr & 0x3) == 0);
+
+    switch (addr & 0xffc) {
+    case ICP_XIRR:
+        if (byte0) {
+            icp_set_cppr(icp, val);
+        } else if (width == 4) {
+            icp_eoi(icp, val);
+        } else {
+            goto bad_access;
+        }
+        break;
+    case ICP_MFRR:
+        if (byte0) {
+            icp_set_mfrr(icp, val);
+        } else {
+            goto bad_access;
+        }
+        break;
+    case ICP_LINKA:
+        if (width == 4) {
+            picp->links[0] = val;
+        } else {
+            goto bad_access;
+        }
+        break;
+    case ICP_LINKB:
+        if (width == 4) {
+            picp->links[1] = val;
+        } else {
+            goto bad_access;
+        }
+        break;
+    case ICP_LINKC:
+        if (width == 4) {
+            picp->links[2] = val;
+        } else {
+            goto bad_access;
+        }
+        break;
+    default:
+bad_access:
+        qemu_log_mask(LOG_GUEST_ERROR, "XICS: Bad ICP access 0x%"
+                      HWADDR_PRIx"/%d\n", addr, width);
+    }
+}
+
+static const MemoryRegionOps pnv_icp_ops = {
+    .read = pnv_icp_read,
+    .write = pnv_icp_write,
+    .endianness = DEVICE_BIG_ENDIAN,
+    .valid = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+    },
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+    },
+};
+
+static void pnv_icp_realize(DeviceState *dev, Error **errp)
+{
+    PnvICPState *icp = PNV_ICP(dev);
+
+    memory_region_init_io(&icp->mmio, OBJECT(dev), &pnv_icp_ops,
+                          icp, "icp-thread", 0x1000);
+}
+
+static void pnv_icp_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    ICPStateClass *icpc = ICP_CLASS(klass);
+
+    icpc->realize = pnv_icp_realize;
+    dc->desc = "PowerNV ICP";
+}
+
+static const TypeInfo pnv_icp_info = {
+    .name          = TYPE_PNV_ICP,
+    .parent        = TYPE_ICP,
+    .instance_size = sizeof(PnvICPState),
+    .class_init    = pnv_icp_class_init,
+    .class_size    = sizeof(ICPStateClass),
+};
+
+static void pnv_icp_register_types(void)
+{
+    type_register_static(&pnv_icp_info);
+}
+
+type_init(pnv_icp_register_types)