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[Qemu-devel] [PATCH v5 21/33] nvdimm: implement NVDIMM device abstract
From: |
Xiao Guangrong |
Subject: |
[Qemu-devel] [PATCH v5 21/33] nvdimm: implement NVDIMM device abstract |
Date: |
Wed, 28 Oct 2015 22:26:19 +0000 |
Introduce "nvdimm" device which is based on dimm device type
128K memory region which is the minimum namespace label size
required by NVDIMM Namespace Spec locates at the end of
backend memory device is reserved for label data
We can use "-m 1G,maxmem=100G,slots=10 -object memory-backend-file,
id=mem1,size=1G,mem-path=/dev/pmem0 -device nvdimm,memdev=mem1" to
create NVDIMM device for guest
Signed-off-by: Xiao Guangrong <address@hidden>
---
default-configs/i386-softmmu.mak | 1 +
default-configs/x86_64-softmmu.mak | 1 +
hw/acpi/memory_hotplug.c | 6 ++
hw/mem/Makefile.objs | 1 +
hw/mem/nvdimm.c | 113 +++++++++++++++++++++++++++++++++++++
include/hw/mem/nvdimm.h | 83 +++++++++++++++++++++++++++
6 files changed, 205 insertions(+)
create mode 100644 hw/mem/nvdimm.c
create mode 100644 include/hw/mem/nvdimm.h
diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
index 3ece8bb..4e84a1c 100644
--- a/default-configs/i386-softmmu.mak
+++ b/default-configs/i386-softmmu.mak
@@ -47,6 +47,7 @@ CONFIG_APIC=y
CONFIG_IOAPIC=y
CONFIG_PVPANIC=y
CONFIG_MEM_HOTPLUG=y
+CONFIG_NVDIMM=y
CONFIG_XIO3130=y
CONFIG_IOH3420=y
CONFIG_I82801B11=y
diff --git a/default-configs/x86_64-softmmu.mak
b/default-configs/x86_64-softmmu.mak
index 92ea7c1..e877a86 100644
--- a/default-configs/x86_64-softmmu.mak
+++ b/default-configs/x86_64-softmmu.mak
@@ -47,6 +47,7 @@ CONFIG_APIC=y
CONFIG_IOAPIC=y
CONFIG_PVPANIC=y
CONFIG_MEM_HOTPLUG=y
+CONFIG_NVDIMM=y
CONFIG_XIO3130=y
CONFIG_IOH3420=y
CONFIG_I82801B11=y
diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
index e232641..92cd973 100644
--- a/hw/acpi/memory_hotplug.c
+++ b/hw/acpi/memory_hotplug.c
@@ -1,6 +1,7 @@
#include "hw/acpi/memory_hotplug.h"
#include "hw/acpi/pc-hotplug.h"
#include "hw/mem/dimm.h"
+#include "hw/mem/nvdimm.h"
#include "hw/boards.h"
#include "hw/qdev-core.h"
#include "trace.h"
@@ -231,6 +232,11 @@ void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq,
MemHotplugState *mem_st,
{
MemStatus *mdev;
+ /* Currently, NVDIMM hotplug has not been supported yet. */
+ if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
+ return;
+ }
+
mdev = acpi_memory_slot_status(mem_st, dev, errp);
if (!mdev) {
return;
diff --git a/hw/mem/Makefile.objs b/hw/mem/Makefile.objs
index cebb4b1..12d9b72 100644
--- a/hw/mem/Makefile.objs
+++ b/hw/mem/Makefile.objs
@@ -1,2 +1,3 @@
common-obj-$(CONFIG_DIMM) += dimm.o
common-obj-$(CONFIG_MEM_HOTPLUG) += pc-dimm.o
+common-obj-$(CONFIG_NVDIMM) += nvdimm.o
diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c
new file mode 100644
index 0000000..825d664
--- /dev/null
+++ b/hw/mem/nvdimm.c
@@ -0,0 +1,113 @@
+/*
+ * Non-Volatile Dual In-line Memory Module Virtualization Implementation
+ *
+ * Copyright(C) 2015 Intel Corporation.
+ *
+ * Author:
+ * Xiao Guangrong <address@hidden>
+ *
+ * Currently, it only supports PMEM Virtualization.
+ *
+ * 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 "qapi/visitor.h"
+#include "hw/mem/nvdimm.h"
+
+static MemoryRegion *nvdimm_get_memory_region(DIMMDevice *dimm)
+{
+ NVDIMMDevice *nvdimm = NVDIMM(dimm);
+
+ return memory_region_size(&nvdimm->nvdimm_mr) ? &nvdimm->nvdimm_mr : NULL;
+}
+
+static void nvdimm_realize(DIMMDevice *dimm, Error **errp)
+{
+ MemoryRegion *mr;
+ NVDIMMDevice *nvdimm = NVDIMM(dimm);
+ uint64_t size;
+
+ nvdimm->label_size = MIN_NAMESPACE_LABEL_SIZE;
+
+ mr = host_memory_backend_get_memory(dimm->hostmem, errp);
+ size = memory_region_size(mr);
+
+ if (size <= nvdimm->label_size) {
+ char *path =
object_get_canonical_path_component(OBJECT(dimm->hostmem));
+ error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too small"
+ " to contain nvdimm namespace label (0x%" PRIx64 ")", path,
+ memory_region_size(mr), nvdimm->label_size);
+ return;
+ }
+
+ memory_region_init_alias(&nvdimm->nvdimm_mr, OBJECT(dimm), "nvdimm-memory",
+ mr, 0, size - nvdimm->label_size);
+ nvdimm->label_data = memory_region_get_ram_ptr(mr) +
+ memory_region_size(&nvdimm->nvdimm_mr);
+}
+
+static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf,
+ uint64_t size, uint64_t offset)
+{
+ assert(nvdimm->label_size >= size + offset);
+
+ memcpy(buf, nvdimm->label_data + offset, size);
+}
+
+static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf,
+ uint64_t size, uint64_t offset)
+{
+ MemoryRegion *mr;
+ DIMMDevice *dimm = DIMM(nvdimm);
+ uint64_t backend_offset;
+
+ assert(nvdimm->label_size >= size + offset);
+
+ memcpy(nvdimm->label_data + offset, buf, size);
+
+ mr = host_memory_backend_get_memory(dimm->hostmem, &error_abort);
+ backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
+ memory_region_set_dirty(mr, backend_offset, size);
+}
+
+static void nvdimm_class_init(ObjectClass *oc, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(oc);
+ DIMMDeviceClass *ddc = DIMM_CLASS(oc);
+ NVDIMMClass *nvc = NVDIMM_CLASS(oc);
+
+ /* nvdimm hotplug has not been supported yet. */
+ dc->hotpluggable = false;
+
+ ddc->realize = nvdimm_realize;
+ ddc->get_memory_region = nvdimm_get_memory_region;
+
+ nvc->read_label_data = nvdimm_read_label_data;
+ nvc->write_label_data = nvdimm_write_label_data;
+}
+
+static TypeInfo nvdimm_info = {
+ .name = TYPE_NVDIMM,
+ .parent = TYPE_DIMM,
+ .instance_size = sizeof(NVDIMMDevice),
+ .class_init = nvdimm_class_init,
+ .class_size = sizeof(NVDIMMClass),
+};
+
+static void nvdimm_register_types(void)
+{
+ type_register_static(&nvdimm_info);
+}
+
+type_init(nvdimm_register_types)
diff --git a/include/hw/mem/nvdimm.h b/include/hw/mem/nvdimm.h
new file mode 100644
index 0000000..cd90957
--- /dev/null
+++ b/include/hw/mem/nvdimm.h
@@ -0,0 +1,83 @@
+/*
+ * Non-Volatile Dual In-line Memory Module Virtualization Implementation
+ *
+ * Copyright(C) 2015 Intel Corporation.
+ *
+ * Author:
+ * Xiao Guangrong <address@hidden>
+ *
+ * NVDIMM specifications and some documents can be found at:
+ * NVDIMM ACPI device and NFIT are introduced in ACPI 6:
+ * http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
+ * NVDIMM Namespace specification:
+ * http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
+ * DSM Interface Example:
+ * http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
+ * Driver Writer's Guide:
+ * http://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_NVDIMM_H
+#define QEMU_NVDIMM_H
+
+#include "hw/mem/dimm.h"
+
+/*
+ * The minimum label data size is required by NVDIMM Namespace
+ * specification, please refer to chapter 2 Namespaces:
+ * "NVDIMMs following the NVDIMM Block Mode Specification use an area
+ * at least 128KB in size, which holds around 1000 labels."
+ */
+#define MIN_NAMESPACE_LABEL_SIZE (128UL << 10)
+
+#define TYPE_NVDIMM "nvdimm"
+#define NVDIMM(obj) OBJECT_CHECK(NVDIMMDevice, (obj), TYPE_NVDIMM)
+#define NVDIMM_CLASS(oc) OBJECT_CLASS_CHECK(NVDIMMClass, (oc), TYPE_NVDIMM)
+#define NVDIMM_GET_CLASS(obj) OBJECT_GET_CLASS(NVDIMMClass, (obj), \
+ TYPE_NVDIMM)
+
+struct NVDIMMDevice {
+ /* private */
+ DIMMDevice parent_obj;
+
+ /* public */
+
+ /*
+ * the size of label data in NVDIMM device which is presented to
+ * guest via __DSM "Get Namespace Label Size" command.
+ */
+ uint64_t label_size;
+
+ /*
+ * the address of label data which is read by __DSM "Get Namespace
+ * Label Data" command and written by __DSM "Set Namespace Label
+ * Data" command.
+ */
+ void *label_data;
+
+ /*
+ * it's the PMEM region in NVDIMM device, which is presented to
+ * guest via ACPI NFIT and _FIT method if NVDIMM hotplug is supported.
+ */
+ MemoryRegion nvdimm_mr;
+};
+typedef struct NVDIMMDevice NVDIMMDevice;
+
+struct NVDIMMClass {
+ /* private */
+ DIMMDeviceClass parent_class;
+
+ /* public */
+ /* read @size bytes from NVDIMM label data at @offset into @buf. */
+ void (*read_label_data)(NVDIMMDevice *nvdimm, void *buf,
+ uint64_t size, uint64_t offset);
+ /* write @size bytes from @buf to NVDIMM label data at @offset. */
+ void (*write_label_data)(NVDIMMDevice *nvdimm, const void *buf,
+ uint64_t size, uint64_t offset);
+};
+typedef struct NVDIMMClass NVDIMMClass;
+
+#endif
--
1.8.3.1
- [Qemu-devel] [PATCH v5 12/33] pc-dimm: remove DEFAULT_PC_DIMMSIZE, (continued)
- [Qemu-devel] [PATCH v5 12/33] pc-dimm: remove DEFAULT_PC_DIMMSIZE, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 15/33] stubs: rename qmp_pc_dimm_device_list.c, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 14/33] pc-dimm: drop the prefix of pc-dimm, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 13/33] pc-dimm: make pc_existing_dimms_capacity static and rename it, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 17/33] dimm: abstract dimm device from pc-dimm, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 18/33] dimm: get mapped memory region from DIMMDeviceClass->get_memory_region, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 16/33] pc-dimm: rename pc-dimm.c and pc-dimm.h, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 19/33] dimm: keep the state of the whole backend memory, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 22/33] docs: add NVDIMM ACPI documentation, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 20/33] dimm: introduce realize callback, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 21/33] nvdimm: implement NVDIMM device abstract,
Xiao Guangrong <=
- [Qemu-devel] [PATCH v5 23/33] nvdimm acpi: init the resource used by NVDIMM ACPI, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 26/33] nvdimm acpi: save arg3 for NVDIMM device _DSM method, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 28/33] nvdimm acpi: support Get Namespace Label Size function, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 25/33] nvdimm acpi: build ACPI nvdimm devices, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 24/33] nvdimm acpi: build ACPI NFIT table, Xiao Guangrong, 2015/10/28
- [Qemu-devel] [PATCH v5 27/33] nvdimm acpi: support function 0, Xiao Guangrong, 2015/10/28