[Qemu-devel] [PATCH 15/28] Implement the bus structure for PAPR virtual IO

[qemu@gibson.dropbear.id.au]

From: David Gibson <david@gibson.dropbear.id.au>

This extends the "pseries" (PAPR) machine to include a virtual IO bus
supporting the PAPR defined hypercall based virtual IO mechanisms.

So far only one VIO device is provided, the vty / vterm, providing
a full console (polled only, for now).

Signed-off-by: David Gibson <dwg@au1.ibm.com>
---
 Makefile.target |    3 +-
 hw/spapr.c      |   47 ++++++++-----
 hw/spapr.h      |    3 +
 hw/spapr_vio.c  |  212 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/spapr_vio.h  |   50 +++++++++++++
 hw/spapr_vty.c  |  145 +++++++++++++++++++++++++++++++++++++
 6 files changed, 441 insertions(+), 19 deletions(-)
 create mode 100644 hw/spapr_vio.c
 create mode 100644 hw/spapr_vio.h
 create mode 100644 hw/spapr_vty.c

diff --git a/Makefile.target b/Makefile.target
index 72fac45..ba243bf 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -232,7 +232,8 @@ obj-ppc-y += ppc_oldworld.o
 # NewWorld PowerMac
 obj-ppc-y += ppc_newworld.o
 # IBM pSeries (sPAPR)
-obj-ppc-y += spapr.o spapr_hcall.o
+obj-ppc-y += spapr.o spapr_hcall.o spapr_vio.o
+obj-ppc-y += spapr_vty.o
 # PowerPC 4xx boards
 obj-ppc-y += ppc4xx_devs.o ppc4xx_pci.o ppc405_uc.o ppc405_boards.o
 obj-ppc-y += ppc440.o ppc440_bamboo.o
diff --git a/hw/spapr.c b/hw/spapr.c
index 8b4e16e..25e4a9e 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -25,7 +25,6 @@
  *
  */
 #include "sysemu.h"
-#include "qemu-char.h"
 #include "hw.h"
 #include "elf.h"
 
@@ -34,6 +33,7 @@
 #include "hw/loader.h"
 
 #include "hw/spapr.h"
+#include "hw/spapr_vio.h"
 
 #include <libfdt.h>
 
@@ -58,6 +58,7 @@ static void *spapr_create_fdt(int *fdt_size, ram_addr_t ramsize,
     uint32_t end_prop = cpu_to_be32(initrd_base + initrd_size);
     int i;
     char *modelname;
+    int ret;
 
 #define _FDT(exp) \
     do { \
@@ -152,9 +153,29 @@ static void *spapr_create_fdt(int *fdt_size, ram_addr_t ramsize,
 
     _FDT((fdt_end_node(fdt)));
 
+    /* vdevice */
+    _FDT((fdt_begin_node(fdt, "vdevice")));
+
+    _FDT((fdt_property_string(fdt, "device_type", "vdevice")));
+    _FDT((fdt_property_string(fdt, "compatible", "IBM,vdevice")));
+    _FDT((fdt_property_cell(fdt, "#address-cells", 0x1)));
+    _FDT((fdt_property_cell(fdt, "#size-cells", 0x0)));
+    
+    _FDT((fdt_end_node(fdt)));
+
     _FDT((fdt_end_node(fdt))); /* close root node */
     _FDT((fdt_finish(fdt)));
 
+    /* re-expand to allow for further tweaks */
+    _FDT((fdt_open_into(fdt, fdt, FDT_MAX_SIZE)));
+
+    ret = spapr_populate_vdevice(spapr->vio_bus, fdt);
+    if (ret < 0) {
+        fprintf(stderr, "couldn't setup vio devices in fdt\n");
+    }
+
+    _FDT((fdt_pack(fdt)));
+
     if (fdt_size) {
         *fdt_size = fdt_totalsize(fdt);
     }
@@ -173,21 +194,6 @@ static void emulate_spapr_hypercall(CPUState *env, void *opaque)
                                   env->gpr[3], &env->gpr[4]);
 }
 
-/* FIXME: hack until we implement the proper VIO console */
-static target_ulong h_put_term_char(CPUState *env, sPAPREnvironment *spapr,
-                                    target_ulong opcode, target_ulong *args)
-{
-    uint8_t buf[16];
-
-    stq_p(buf, args[2]);
-    stq_p(buf + 8, args[3]);
-
-    qemu_chr_write(serial_hds[0], buf, args[1]);
-
-    return 0;
-}
-
-
 /* pSeries LPAR / sPAPR hardware init */
 static void ppc_spapr_init(ram_addr_t ram_size,
                            const char *boot_device,
@@ -242,7 +248,13 @@ static void ppc_spapr_init(ram_addr_t ram_size,
     ram_offset = qemu_ram_alloc(NULL, "ppc_spapr.ram", ram_size);
     cpu_register_physical_memory(0, ram_size, ram_offset);
 
-    spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char);
+    spapr->vio_bus = spapr_vio_bus_init();
+
+    for (i = 0; i < MAX_SERIAL_PORTS; i++) {
+        if (serial_hds[i]) {
+            spapr_vty_create(spapr->vio_bus, i, serial_hds[i]);
+        }
+    }
 
     if (kernel_filename) {
         uint64_t lowaddr = 0;
@@ -274,7 +286,6 @@ static void ppc_spapr_init(ram_addr_t ram_size,
             initrd_base = 0;
             initrd_size = 0;
         }
-
     } else {
         fprintf(stderr, "pSeries machine needs -kernel for now");
         exit(1);
diff --git a/hw/spapr.h b/hw/spapr.h
index 9e63a19..47bf2ef 100644
--- a/hw/spapr.h
+++ b/hw/spapr.h
@@ -1,7 +1,10 @@
 #if !defined (__HW_SPAPR_H__)
 #define __HW_SPAPR_H__
 
+struct VIOsPAPRBus;
+
 typedef struct sPAPREnvironment {
+    struct VIOsPAPRBus *vio_bus;
 } sPAPREnvironment;
 
 #define H_SUCCESS         0
diff --git a/hw/spapr_vio.c b/hw/spapr_vio.c
new file mode 100644
index 0000000..67005bb
--- /dev/null
+++ b/hw/spapr_vio.c
@@ -0,0 +1,212 @@
+/*
+ * QEMU sPAPR VIO code
+ *
+ * Copyright (c) 2010 David Gibson, IBM Corporation <david@gibson.dropbear.id.au>
+ * Based on the s390 virtio bus code:
+ * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
+ *
+ * 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 "hw.h"
+#include "sysemu.h"
+#include "boards.h"
+#include "monitor.h"
+#include "loader.h"
+#include "elf.h"
+#include "hw/sysbus.h"
+#include "kvm.h"
+#include "device_tree.h"
+
+#include "hw/spapr.h"
+#include "hw/spapr_vio.h"
+
+#ifdef CONFIG_FDT
+#include <libfdt.h>
+#endif /* CONFIG_FDT */
+
+/* #define DEBUG_SPAPR */
+
+#ifdef DEBUG_SPAPR
+#define dprintf(fmt, ...) \
+    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
+#else
+#define dprintf(fmt, ...) \
+    do { } while (0)
+#endif
+
+struct BusInfo spapr_vio_bus_info = {
+    .name       = "spapr-vio",
+    .size       = sizeof(VIOsPAPRBus),
+};
+
+VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)
+{
+    DeviceState *qdev;
+    VIOsPAPRDevice *dev = NULL;
+
+    QLIST_FOREACH(qdev, &bus->bus.children, sibling) {
+        dev = (VIOsPAPRDevice *)qdev;
+        if (dev->reg == reg) {
+            break;
+        }
+    }
+
+    return dev;
+}
+
+#ifdef CONFIG_FDT
+static int vio_make_devnode(VIOsPAPRDevice *dev,
+                            void *fdt)
+{
+    VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)dev->qdev.info;
+    int vdevice_off, node_off;
+    int ret;
+
+    vdevice_off = fdt_path_offset(fdt, "/vdevice");
+    if (vdevice_off < 0) {
+        return vdevice_off;
+    }
+
+    node_off = fdt_add_subnode(fdt, vdevice_off, dev->qdev.id);
+    if (node_off < 0) {
+        return node_off;
+    }
+
+    ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
+    if (ret < 0) {
+        return ret;
+    }
+
+    if (info->dt_type) {
+        ret = fdt_setprop_string(fdt, node_off, "device_type",
+                                 info->dt_type);
+        if (ret < 0) {
+            return ret;
+        }
+    }
+
+    if (info->dt_compatible) {
+        ret = fdt_setprop_string(fdt, node_off, "compatible",
+                                 info->dt_compatible);
+        if (ret < 0) {
+            return ret;
+        }
+    }
+
+    if (info->devnode) {
+        ret = (info->devnode)(dev, fdt, node_off);
+        if (ret < 0) {
+            return ret;
+        }
+    }
+
+    return node_off;
+}
+#endif /* CONFIG_FDT */
+
+static int spapr_vio_busdev_init(DeviceState *dev, DeviceInfo *info)
+{
+    VIOsPAPRDeviceInfo *_info = (VIOsPAPRDeviceInfo *)info;
+    VIOsPAPRDevice *_dev = (VIOsPAPRDevice *)dev;
+    char *id;
+
+    if (asprintf(&id, "%s@%x", _info->dt_name, _dev->reg) < 0) {
+        return -1;
+    }
+
+    _dev->qdev.id = id;
+
+    return _info->init(_dev);
+}
+
+void spapr_vio_bus_register_withprop(VIOsPAPRDeviceInfo *info)
+{
+    info->qdev.init = spapr_vio_busdev_init;
+    info->qdev.bus_info = &spapr_vio_bus_info;
+
+    assert(info->qdev.size >= sizeof(VIOsPAPRDevice));
+    qdev_register(&info->qdev);
+}
+
+VIOsPAPRBus *spapr_vio_bus_init(void)
+{
+    VIOsPAPRBus *bus;
+    BusState *_bus;
+    DeviceState *dev;
+    DeviceInfo *_info;
+
+    /* Create bridge device */
+    dev = qdev_create(NULL, "spapr-vio-bridge");
+    qdev_init_nofail(dev);
+
+    /* Create bus on bridge device */
+
+    _bus = qbus_create(&spapr_vio_bus_info, dev, "spapr-vio");
+    bus = DO_UPCAST(VIOsPAPRBus, bus, _bus);
+
+    for (_info = device_info_list; _info; _info = _info->next) {
+        VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)_info;
+
+        if (_info->bus_info != &spapr_vio_bus_info)
+            continue;
+
+        if (info->hcalls)
+            info->hcalls(bus);
+    }
+
+    return bus;
+}
+
+/* Represents sPAPR hcall VIO devices */
+
+static int spapr_vio_bridge_init(SysBusDevice *dev)
+{
+    /* nothing */
+    return 0;
+}
+
+static SysBusDeviceInfo spapr_vio_bridge_info = {
+    .init = spapr_vio_bridge_init,
+    .qdev.name  = "spapr-vio-bridge",
+    .qdev.size  = sizeof(SysBusDevice),
+    .qdev.no_user = 1,
+};
+
+static void spapr_vio_register_devices(void)
+{
+    sysbus_register_withprop(&spapr_vio_bridge_info);
+}
+
+device_init(spapr_vio_register_devices)
+
+#ifdef CONFIG_FDT
+int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt)
+{
+    DeviceState *qdev;
+    int ret = 0;
+
+    QLIST_FOREACH(qdev, &bus->bus.children, sibling) {
+        VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
+
+        ret = vio_make_devnode(dev, fdt);
+
+        if (ret < 0) {
+            return ret;
+        }
+    }
+    
+    return 0;
+}
+#endif /* CONFIG_FDT */
diff --git a/hw/spapr_vio.h b/hw/spapr_vio.h
new file mode 100644
index 0000000..b164ad3
--- /dev/null
+++ b/hw/spapr_vio.h
@@ -0,0 +1,50 @@
+#ifndef _HW_SPAPR_VIO_H
+#define _HW_SPAPR_VIO_H
+/*
+ * QEMU sPAPR VIO bus definitions
+ *
+ * Copyright (c) 2010 David Gibson, IBM Corporation <david@gibson.dropbear.id.au>
+ * Based on the s390 virtio bus definitions:
+ * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
+ *
+ * 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/>.
+ */
+
+typedef struct VIOsPAPRDevice {
+    DeviceState qdev;
+    uint32_t reg;
+} VIOsPAPRDevice;
+
+typedef struct VIOsPAPRBus {
+    BusState bus;
+} VIOsPAPRBus;
+
+typedef struct {
+    DeviceInfo qdev;
+    const char *dt_name, *dt_type, *dt_compatible;
+    int (*init)(VIOsPAPRDevice *dev);
+    void (*hcalls)(VIOsPAPRBus *bus);
+    int (*devnode)(VIOsPAPRDevice *dev, void *fdt, int node_off);
+} VIOsPAPRDeviceInfo;
+
+extern VIOsPAPRBus *spapr_vio_bus_init(void);
+extern VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg);
+extern void spapr_vio_bus_register_withprop(VIOsPAPRDeviceInfo *info);
+extern int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt);
+
+void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len);
+void spapr_vty_create(VIOsPAPRBus *bus,
+                      uint32_t reg, CharDriverState *chardev);
+
+#endif /* _HW_SPAPR_VIO_H */
diff --git a/hw/spapr_vty.c b/hw/spapr_vty.c
new file mode 100644
index 0000000..afc9ef9
--- /dev/null
+++ b/hw/spapr_vty.c
@@ -0,0 +1,145 @@
+#include "qdev.h"
+#include "qemu-char.h"
+#include "hw/spapr.h"
+#include "hw/spapr_vio.h"
+
+#define VTERM_BUFSIZE   16
+
+typedef struct VIOsPAPRVTYDevice {
+    VIOsPAPRDevice sdev;
+    CharDriverState *chardev;
+    uint32_t in, out;
+    uint8_t buf[VTERM_BUFSIZE];
+} VIOsPAPRVTYDevice;
+
+static int vty_can_receive(void *opaque)
+{
+    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
+
+    return (dev->in - dev->out) < VTERM_BUFSIZE;
+}
+
+static void vty_receive(void *opaque, const uint8_t *buf, int size)
+{
+    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
+    int i;
+
+    for (i = 0; i < size; i++) {
+        assert((dev->in - dev->out) < VTERM_BUFSIZE);
+        dev->buf[dev->in++ % VTERM_BUFSIZE] = buf[i];
+    }
+}
+
+static int vty_getchars(VIOsPAPRDevice *sdev, uint8_t *buf, int max)
+{
+    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
+    int n = 0;
+
+    while ((n < max) && (dev->out != dev->in))
+        buf[n++] = dev->buf[dev->out++ % VTERM_BUFSIZE];
+
+    return n;
+}
+
+void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len)
+{
+    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
+
+    /* FIXME: should check the qemu_chr_write() return value */
+    qemu_chr_write(dev->chardev, buf, len);
+}
+
+static int spapr_vty_init(VIOsPAPRDevice *sdev)
+{
+    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;
+
+    qemu_chr_add_handlers(dev->chardev, vty_can_receive,
+                          vty_receive, NULL, dev);
+
+    return 0;
+}
+
+static target_ulong h_put_term_char(CPUState *env, sPAPREnvironment *spapr,
+                                    target_ulong opcode, target_ulong *args)
+{
+    target_ulong reg = args[0];
+    target_ulong len = args[1];
+    target_ulong char0_7 = args[2];
+    target_ulong char8_15 = args[3];
+    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
+    uint8_t buf[16];
+
+    if (!sdev)
+        return H_PARAMETER;
+
+    if (len > 16)
+        return H_PARAMETER;
+
+    *((uint64_t *)buf) = cpu_to_be64(char0_7);
+    *((uint64_t *)buf + 1) = cpu_to_be64(char8_15);
+
+    vty_putchars(sdev, buf, len);
+
+    return H_SUCCESS;
+}
+
+static target_ulong h_get_term_char(CPUState *env, sPAPREnvironment *spapr,
+                                    target_ulong opcode, target_ulong *args)
+{
+    target_ulong reg = args[0];
+    target_ulong *len = args + 0;
+    target_ulong *char0_7 = args + 1;
+    target_ulong *char8_15 = args + 2;
+    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
+    uint8_t buf[16];
+
+    if (!sdev)
+        return H_PARAMETER;
+
+    *len = vty_getchars(sdev, buf, sizeof(buf));
+    if (*len < 16)
+        memset(buf + *len, 0, 16 - *len);
+
+    *char0_7 = be64_to_cpu(*((uint64_t *)buf));
+    *char8_15 = be64_to_cpu(*((uint64_t *)buf + 1));
+
+    return H_SUCCESS;
+}
+
+void spapr_vty_create(VIOsPAPRBus *bus,
+                      uint32_t reg, CharDriverState *chardev)
+{
+    DeviceState *dev;
+
+    dev = qdev_create(&bus->bus, "spapr-vty");
+    qdev_prop_set_uint32(dev, "reg", reg);
+    qdev_prop_set_chr(dev, "chardev", chardev);
+    qdev_init_nofail(dev);
+}
+
+static void vty_hcalls(VIOsPAPRBus *bus)
+{
+    spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char);
+    spapr_register_hypercall(H_GET_TERM_CHAR, h_get_term_char);
+}
+
+static VIOsPAPRDeviceInfo spapr_vty = {
+    .init = spapr_vty_init,
+    .dt_name = "vty",
+    .dt_type = "serial",
+    .dt_compatible = "hvterm1",
+    .hcalls = vty_hcalls,
+    .qdev.name = "spapr-vty",
+    .qdev.size = sizeof(VIOsPAPRVTYDevice),
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0),
+        DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+
+static void spapr_vty_register(void)
+{
+    spapr_vio_bus_register_withprop(&spapr_vty);
+}
+device_init(spapr_vty_register);
-- 
1.7.1