[RFC PATCH v3 7/9] hw/misc/memexpose: Add memexpose memory region device

[i.kotrasinsk@partner.samsung.com]

From: Igor Kotrasinski <i.kotrasinsk@partner.samsung.com>

Signed-off-by: Igor Kotrasinski <i.kotrasinsk@partner.samsung.com>
---
 MAINTAINERS                             |   2 +
 hw/misc/memexpose/Makefile.objs         |   1 +
 hw/misc/memexpose/memexpose-memregion.c | 142 ++++++++++++++++++++++++++++++++
 hw/misc/memexpose/memexpose-memregion.h |  41 +++++++++
 4 files changed, 186 insertions(+)
 create mode 100644 hw/misc/memexpose/memexpose-memregion.c
 create mode 100644 hw/misc/memexpose/memexpose-memregion.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 0517556..e016cff 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1648,6 +1648,8 @@ F: hw/misc/memexpose/memexpose-core.c
 F: hw/misc/memexpose/memexpose-msg.h
 F: hw/misc/memexpose/memexpose-msg.c
 F: hw/misc/memexpose/memexpose-pci.c
+F: hw/misc/memexpose/memexpose-memregion.h
+F: hw/misc/memexpose/memexpose-memregion.c
 
 nvme
 M: Keith Busch <keith.busch@intel.com>
diff --git a/hw/misc/memexpose/Makefile.objs b/hw/misc/memexpose/Makefile.objs
index 05a2395..056bff3 100644
--- a/hw/misc/memexpose/Makefile.objs
+++ b/hw/misc/memexpose/Makefile.objs
@@ -1,3 +1,4 @@
 common-obj-y += memexpose-msg.o
 common-obj-y += memexpose-core.o
 common-obj-$(CONFIG_PCI) += memexpose-pci.o
+common-obj-y += memexpose-memregion.o
diff --git a/hw/misc/memexpose/memexpose-memregion.c b/hw/misc/memexpose/memexpose-memregion.c
new file mode 100644
index 0000000..fbdd966
--- /dev/null
+++ b/hw/misc/memexpose/memexpose-memregion.c
@@ -0,0 +1,142 @@
+/*
+ *  Memexpose ARM device
+ *
+ *  Copyright (C) 2020 Samsung Electronics Co Ltd.
+ *    Igor Kotrasinski, <i.kotrasinsk@partner.samsung.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "hw/irq.h"
+#include "hw/sysbus.h"
+#include "hw/qdev-properties.h"
+#include "exec/memory.h"
+#include "exec/address-spaces.h"
+#include "memexpose-core.h"
+#include "memexpose-memregion.h"
+
+static void memexpose_memdev_intr(void *opaque, int dir)
+{
+    MemexposeMemdev *dev = opaque;
+    if (dir) {
+        qemu_set_irq(dev->irq, 1);
+    } else {
+        qemu_set_irq(dev->irq, 0);
+    }
+}
+
+static int memexpose_memdev_enable(void *opaque)
+{
+    int ret;
+    MemexposeMemdev *s = opaque;
+
+    ret = memexpose_intr_enable(&s->intr);
+    if (ret) {
+        return ret;
+    }
+
+    ret = memexpose_mem_enable(&s->mem);
+    if (ret) {
+        memexpose_intr_disable(&s->intr);
+        return ret;
+    }
+
+    return 0;
+}
+
+static void memexpose_memdev_disable(void *opaque)
+{
+    MemexposeMemdev *s = opaque;
+
+    memexpose_intr_disable(&s->intr);
+    memexpose_mem_disable(&s->mem);
+}
+
+static void memexpose_memdev_init(Object *obj)
+{
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+    MemexposeMemdev *mdev = MEMEXPOSE_MEMDEV(obj);
+    sysbus_init_mmio(sbd, &mdev->intr.shmem);
+    sysbus_init_irq(sbd, &mdev->irq);
+}
+
+static void memexpose_memdev_finalize(Object *obj)
+{
+}
+
+static void memexpose_memdev_realize(DeviceState *dev, Error **errp)
+{
+    MemexposeMemdev *mdev = MEMEXPOSE_MEMDEV(dev);
+    struct memexpose_intr_ops ops = {
+        .parent = dev,
+        .intr = memexpose_memdev_intr,
+        .enable = memexpose_memdev_enable,
+        .disable = memexpose_memdev_disable,
+    };
+
+    memexpose_intr_init(&mdev->intr, &ops, OBJECT(dev), &mdev->intr_chr, errp);
+    if (*errp) {
+        return;
+    }
+    memexpose_mem_init(&mdev->mem, OBJECT(dev),
+                       get_system_memory(),
+                       &mdev->mem_chr, 1, errp);
+    if (*errp) {
+        goto free_intr;
+    }
+    return;
+
+free_intr:
+    memexpose_intr_destroy(&mdev->intr);
+}
+
+static void memexpose_memdev_unrealize(DeviceState *dev, Error **errp)
+{
+    MemexposeMemdev *mdev = MEMEXPOSE_MEMDEV(dev);
+    memexpose_mem_destroy(&mdev->mem);
+    memexpose_intr_destroy(&mdev->intr);
+}
+
+static Property memexpose_memdev_properties[] = {
+    DEFINE_PROP_CHR("intr_chardev", MemexposeMemdev, intr_chr),
+    DEFINE_PROP_CHR("mem_chardev", MemexposeMemdev, mem_chr),
+    DEFINE_PROP_UINT64("shm_size", MemexposeMemdev, mem.shmem_size, 4096),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void memexpose_memdev_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    dc->realize = memexpose_memdev_realize;
+    dc->unrealize = memexpose_memdev_unrealize;
+    device_class_set_props(dc, memexpose_memdev_properties);
+}
+
+static const TypeInfo memexpose_memdev_info = {
+    .name = TYPE_MEMEXPOSE_MEMDEV,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(MemexposeMemdev),
+    .instance_init = memexpose_memdev_init,
+    .instance_finalize = memexpose_memdev_finalize,
+    .class_init = memexpose_memdev_class_init,
+};
+
+static void register_types(void)
+{
+    type_register_static(&memexpose_memdev_info);
+}
+
+type_init(register_types);
diff --git a/hw/misc/memexpose/memexpose-memregion.h b/hw/misc/memexpose/memexpose-memregion.h
new file mode 100644
index 0000000..7eddcbe
--- /dev/null
+++ b/hw/misc/memexpose/memexpose-memregion.h
@@ -0,0 +1,41 @@
+/*
+ *  Memexpose ARM device
+ *
+ *  Copyright (C) 2020 Samsung Electronics Co Ltd.
+ *    Igor Kotrasinski, <i.kotrasinsk@partner.samsung.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef _MEMEXPOSE_MEMDEV_H_
+#define _MEMEXPOSE_MEMDEV_H_
+
+#include "memexpose-core.h"
+#include "hw/sysbus.h"
+
+#define TYPE_MEMEXPOSE_MEMDEV "memexpose-memdev"
+#define MEMEXPOSE_MEMDEV(obj) \
+    OBJECT_CHECK(MemexposeMemdev, (obj), TYPE_MEMEXPOSE_MEMDEV)
+
+typedef struct MemexposeMemdev {
+    SysBusDevice dev;
+    MemexposeIntr intr;
+    MemexposeMem mem;
+    CharBackend intr_chr;
+    CharBackend mem_chr;
+    qemu_irq irq;
+} MemexposeMemdev;
+
+#endif /* _MEMEXPOSE_MEMDEV_H_ */
-- 
2.7.4