[Qemu-devel] [PATCH 38/77] ppc/xics: Add "native" XICS subclass

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

This provides MMIO based ICP access as found on POWER8

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 default-configs/ppc64-softmmu.mak |   3 +-
 hw/intc/Makefile.objs             |   1 +
 hw/intc/xics_native.c             | 294 ++++++++++++++++++++++++++++++++++++++
 include/hw/ppc/xics.h             |  14 ++
 4 files changed, 311 insertions(+), 1 deletion(-)
 create mode 100644 hw/intc/xics_native.c

diff --git a/default-configs/ppc64-softmmu.mak b/default-configs/ppc64-softmmu.mak
index 516a6e2..d30176e 100644
--- a/default-configs/ppc64-softmmu.mak
+++ b/default-configs/ppc64-softmmu.mak
@@ -49,8 +49,9 @@ CONFIG_PLATFORM_BUS=y
 CONFIG_ETSEC=y
 CONFIG_LIBDECNUMBER=y
 # For pSeries
-CONFIG_XICS=$(CONFIG_PSERIES)
+CONFIG_XICS=$(or $(CONFIG_PSERIES),$(CONFIG_POWERNV))
 CONFIG_XICS_SPAPR=$(CONFIG_PSERIES)
+CONFIG_XICS_NATIVE=$(CONFIG_POWERNV)
 CONFIG_XICS_KVM=$(and $(CONFIG_PSERIES),$(CONFIG_KVM))
 # For PReP
 CONFIG_MC146818RTC=y
diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs
index e24cb03..104a169 100644
--- a/hw/intc/Makefile.objs
+++ b/hw/intc/Makefile.objs
@@ -27,6 +27,7 @@ obj-$(CONFIG_OPENPIC_KVM) += openpic_kvm.o
 obj-$(CONFIG_SH4) += sh_intc.o
 obj-$(CONFIG_XICS) += xics.o
 obj-$(CONFIG_XICS_SPAPR) += xics_spapr.o
+obj-$(CONFIG_XICS_NATIVE) += xics_native.o
 obj-$(CONFIG_XICS_KVM) += xics_kvm.o
 obj-$(CONFIG_ALLWINNER_A10_PIC) += allwinner-a10-pic.o
 obj-$(CONFIG_S390_FLIC) += s390_flic.o
diff --git a/hw/intc/xics_native.c b/hw/intc/xics_native.c
new file mode 100644
index 0000000..3f488f3
--- /dev/null
+++ b/hw/intc/xics_native.c
@@ -0,0 +1,294 @@
+/*
+ * QEMU PowerPC hardware System Emulator
+ *
+ * Native version of ICS/ICP
+ *
+ * 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 "qemu/timer.h"
+#include "hw/ppc/xics.h"
+#include "qemu/error-report.h"
+#include "qapi/visitor.h"
+
+#include <libfdt.h>
+
+//#define DEBUG_MM(fmt...)      printf(fmt)
+#define DEBUG_MM(fmt...)        do { } while(0)
+
+static void xics_native_initfn(Object *obj)
+{
+    XICSState *xics = XICS_NATIVE(obj);
+
+    QLIST_INIT(&xics->ics);
+}
+
+static uint64_t icp_mm_read(void *opaque, hwaddr addr, unsigned width)
+{
+    XICSState *s = opaque;
+    int32_t cpu_id, server;
+    uint32_t val;
+    ICPState *ss;
+    bool byte0 = (width == 1 && (addr & 0x3) == 0);
+
+    cpu_id = (addr & (ICP_MM_SIZE - 1)) >> 12;
+    server = get_cpu_index_by_dt_id(cpu_id);
+    if (server < 0) {
+        fprintf(stderr, "XICS: Bad ICP server %d\n", server);
+        goto bad_access;
+    }
+    ss = &s->ss[server];
+
+    switch(addr & 0xffc) {
+    case 0: /* poll */
+        val = icp_ipoll(ss, NULL);
+        if (byte0) {
+            val >>= 24;
+        } else if (width != 4) {
+            goto bad_access;
+        }
+        break;
+    case 4: /* xirr */
+        if (byte0) {
+            val = icp_ipoll(ss, NULL) >> 24;
+        } else if (width == 4) {
+            val = icp_accept(ss);
+        } else {
+            goto bad_access;
+        }
+        break;
+    case 12:
+        if (byte0) {
+            val = ss->mfrr;
+        } else {
+            goto bad_access;
+        }
+        break;
+    case 16:
+        if (width == 4) {
+            val = ss->links[0];
+        } else {
+            goto bad_access;
+        }
+        break;
+    case 20:
+        if (width == 4) {
+            val = ss->links[1];
+        } else {
+            goto bad_access;
+        }
+        break;
+    case 24:
+        if (width == 4) {
+            val = ss->links[2];
+        } else {
+            goto bad_access;
+        }
+        break;
+    default:
+bad_access:
+        fprintf(stderr, "XICS: Bad ICP access %llx/%d\n",
+                (unsigned long long)addr, width);
+        val = 0xffffffff;
+    }
+    DEBUG_MM("icp_mm_read(addr=%016llx,serv=0x%x/%d,off=%d,w=%d,val=0x%08x)\n",
+             (unsigned long long)addr, cpu_id, server, (int)(addr & 0xffc),
+             width, val);
+
+    return val;
+}
+
+static void icp_mm_write(void *opaque, hwaddr addr, uint64_t val,
+                        unsigned width)
+{
+    XICSState *s = opaque;
+    int32_t cpu_id, server;
+    ICPState *ss;
+    bool byte0 = (width == 1 && (addr & 0x3) == 0);
+
+    cpu_id = (addr & (ICP_MM_SIZE - 1)) >> 12;
+    server = get_cpu_index_by_dt_id(cpu_id);
+    if (server < 0) {
+        fprintf(stderr, "XICS: Bad ICP server %d\n", server);
+        goto bad_access;
+    }
+    ss = &s->ss[server];
+
+    DEBUG_MM("icp_mm_write(addr=%016llx,serv=0x%x/%d,off=%d,w=%d,val=0x%08x)\n",
+             (unsigned long long)addr, cpu_id, server,
+             (int)(addr & 0xffc), width, (uint32_t)val);
+
+    switch(addr & 0xffc) {
+    case 4: /* xirr */
+        if (byte0) {
+            icp_set_cppr(s, server, val);
+        } else if (width == 4) {
+            icp_eoi(s, server, val);
+        } else {
+            goto bad_access;
+        }
+        break;
+    case 12:
+        if (byte0) {
+            icp_set_mfrr(s, server, val);
+        } else {
+            goto bad_access;
+        }
+        break;
+    case 16:
+        if (width == 4) {
+            ss->links[0] = val;
+        } else {
+            goto bad_access;
+        }
+        break;
+    case 20:
+        if (width == 4) {
+            ss->links[1] = val;
+        } else {
+            goto bad_access;
+        }
+        break;
+    case 24:
+        if (width == 4) {
+            ss->links[2] = val;
+        } else {
+            goto bad_access;
+        }
+        break;
+    default:
+ bad_access:
+        val = 0xffffffff;
+    }
+}
+
+static const MemoryRegionOps icp_mm_ops = {
+    .read = icp_mm_read,
+    .write = icp_mm_write,
+    .valid.min_access_size = 1,
+    .valid.max_access_size = 4,
+    .impl.min_access_size = 1,
+    .impl.max_access_size = 4,
+    .endianness = DEVICE_BIG_ENDIAN,
+};
+
+#define _FDT(exp) \
+    do { \
+        int ret = (exp);                                           \
+        if (ret < 0) {                                             \
+            fprintf(stderr, "qemu: error creating device tree: %s: %s\n", \
+                    #exp, fdt_strerror(ret));                      \
+            exit(1);                                               \
+        }                                                          \
+    } while (0)
+
+void xics_create_native_icp_node(XICSState *s, void *fdt,
+                                 uint32_t base, uint32_t count)
+{
+    uint64_t addr;
+    char *name;
+    const char compat[] = "IBM,power8-icp\0IBM,ppc-xicp";
+    uint32_t irange[2], i, rsize;
+    uint64_t *reg;
+
+    addr = ICP_MM_BASE | (base << 12);
+
+    irange[0] = cpu_to_be32(base);
+    irange[1] = cpu_to_be32(count);
+
+    rsize = sizeof(uint64_t) * 2 * count;
+    reg = g_malloc(rsize);
+    for (i = 0; i < count; i++) {
+        reg[i * 2] = cpu_to_be64(addr | ((base + i) * 0x1000));
+        reg[i * 2 + 1] = cpu_to_be64(0x1000);
+    }
+
+    name = g_strdup_printf("interrupt-controller@%"PRIX64, addr);
+
+    /* interrupt controller */
+    _FDT((fdt_begin_node(fdt, name)));
+    g_free(name);
+
+    _FDT((fdt_property(fdt, "compatible", compat, sizeof(compat))));
+    _FDT((fdt_property(fdt, "reg", reg, rsize)));
+    _FDT((fdt_property_string(fdt, "device_type",
+                              "PowerPC-External-Interrupt-Presentation")));
+    _FDT((fdt_property(fdt, "interrupt-controller", NULL, 0)));
+    _FDT((fdt_property(fdt, "ibm,interrupt-server-ranges",
+                       irange, sizeof(irange))));
+    _FDT((fdt_property_cell(fdt, "#interrupt-cells", 1)));
+    _FDT((fdt_property_cell(fdt, "#address-cells", 0)));
+    _FDT((fdt_end_node(fdt)));
+}
+
+static void xics_native_realize(DeviceState *dev, Error **errp)
+{
+    XICSState *s = XICS_NATIVE(dev);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+    Error *error = NULL;
+    int i;
+
+    if (!s->nr_servers) {
+        error_setg(errp, "Number of servers needs to be greater 0");
+        return;
+    }
+
+    /* Register MMIO regions */
+    memory_region_init_io(&s->icp_mmio, OBJECT(s), &icp_mm_ops, s, "icp",
+                          ICP_MM_SIZE);
+    sysbus_init_mmio(sbd, &s->icp_mmio);
+    sysbus_mmio_map(sbd, 0, ICP_MM_BASE);
+
+    for (i = 0; i < s->nr_servers; i++) {
+        object_property_set_bool(OBJECT(&s->ss[i]), true, "realized", &error);
+        if (error) {
+            error_propagate(errp, error);
+            return;
+        }
+    }
+}
+
+static void xics_native_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+    XICSStateClass *xsc = XICS_NATIVE_CLASS(oc);
+
+    dc->realize = xics_native_realize;
+    xsc->set_nr_servers = xics_set_nr_servers;
+}
+
+static const TypeInfo xics_native_info = {
+    .name          = TYPE_XICS_NATIVE,
+    .parent        = TYPE_XICS_COMMON,
+    .instance_size = sizeof(XICSState),
+    .class_size = sizeof(XICSStateClass),
+    .class_init    = xics_native_class_init,
+    .instance_init = xics_native_initfn,
+};
+
+static void xics_native_register_types(void)
+{
+    type_register_static(&xics_native_info);
+}
+type_init(xics_native_register_types)
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index 93a627b..f32f409 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -38,6 +38,9 @@
 #define TYPE_XICS_SPAPR_KVM "xics-spapr-kvm"
 #define KVM_XICS(obj) OBJECT_CHECK(KVMXICSState, (obj), TYPE_XICS_SPAPR_KVM)
 
+#define TYPE_XICS_NATIVE "xics-native"
+#define XICS_NATIVE(obj) OBJECT_CHECK(XICSState, (obj), TYPE_XICS_NATIVE)
+
 #define XICS_COMMON_CLASS(klass) \
      OBJECT_CLASS_CHECK(XICSStateClass, (klass), TYPE_XICS_COMMON)
 #define XICS_SPAPR_CLASS(klass) \
@@ -46,6 +49,8 @@
      OBJECT_GET_CLASS(XICSStateClass, (obj), TYPE_XICS_COMMON)
 #define XICS_SPAPR_GET_CLASS(obj) \
      OBJECT_GET_CLASS(XICSStateClass, (obj), TYPE_XICS_SPAPR)
+#define XICS_NATIVE_CLASS(klass) \
+     OBJECT_CLASS_CHECK(XICSStateClass, (klass), TYPE_XICS_NATIVE)
 
 #define XICS_IPI        0x2
 #define XICS_BUID       0x1
@@ -80,6 +85,7 @@ struct XICSState {
     uint32_t nr_irqs;
     ICPState *ss;
     QLIST_HEAD(, ICSState) ics;
+    MemoryRegion icp_mmio;
 };
 
 #define TYPE_ICP "icp"
@@ -111,8 +117,13 @@ struct ICPState {
     uint8_t mfrr;
     qemu_irq output;
     bool cap_irq_xics_enabled;
+    uint32_t links[3];
 };
 
+/* This should be an XSCOM BAR ... the size is arbitrary as well */
+#define ICP_MM_BASE     0x0003FFFF80000000
+#define ICP_MM_SIZE     0x0000000010000000
+
 #define TYPE_ICS "ics"
 #define ICS(obj) OBJECT_CHECK(ICSState, (obj), TYPE_ICS)
 
@@ -181,6 +192,9 @@ void xics_spapr_free(XICSState *icp, int irq, int num);
 
 void xics_cpu_setup(XICSState *icp, PowerPCCPU *cpu);
 
+void xics_create_native_icp_node(XICSState *s, void *fdt,
+                                 uint32_t base, uint32_t count);
+
 /* Internal XICS interfaces */
 int get_cpu_index_by_dt_id(int cpu_dt_id);
 
-- 
2.5.0