hw/mem/nvdimm.c - qemu - Git at Google

 /*
  * Non-Volatile Dual In-line Memory Module Virtualization Implementation
  *
  * Copyright(C) 2015 Intel Corporation.
  *
  * Author:
  *  Xiao Guangrong <guangrong.xiao@linux.intel.com>
  *
  * 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 2.1 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 "qemu/module.h"
 #include "qemu/pmem.h"
 #include "qapi/error.h"
 #include "qapi/visitor.h"
 #include "hw/mem/nvdimm.h"
 #include "hw/qdev-properties.h"
 #include "hw/mem/memory-device.h"
 #include "sysemu/hostmem.h"

 static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name,
                                   void *opaque, Error **errp)
 {
     NVDIMMDevice *nvdimm = NVDIMM(obj);
     uint64_t value = nvdimm->label_size;

     visit_type_size(v, name, &value, errp);
 }

 static void nvdimm_set_label_size(Object *obj, Visitor *v, const char *name,
                                   void *opaque, Error **errp)
 {
     NVDIMMDevice *nvdimm = NVDIMM(obj);
     uint64_t value;

     if (nvdimm->nvdimm_mr) {
         error_setg(errp, "cannot change property value");
         return;
     }

     if (!visit_type_size(v, name, &value, errp)) {
         return;
     }
     if (value < MIN_NAMESPACE_LABEL_SIZE) {
         error_setg(errp, "Property '%s.%s' (0x%" PRIx64 ") is required"
                    " at least 0x%lx", object_get_typename(obj), name, value,
                    MIN_NAMESPACE_LABEL_SIZE);
         return;
     }

     nvdimm->label_size = value;
 }

 static void nvdimm_get_uuid(Object *obj, Visitor *v, const char *name,
                                   void *opaque, Error **errp)
 {
     NVDIMMDevice *nvdimm = NVDIMM(obj);
     char *value = NULL;

     value = qemu_uuid_unparse_strdup(&nvdimm->uuid);

     visit_type_str(v, name, &value, errp);
     g_free(value);
 }


 static void nvdimm_set_uuid(Object *obj, Visitor *v, const char *name,
                                   void *opaque, Error **errp)
 {
     NVDIMMDevice *nvdimm = NVDIMM(obj);
     char *value;

     if (!visit_type_str(v, name, &value, errp)) {
         return;
     }

     if (qemu_uuid_parse(value, &nvdimm->uuid) != 0) {
         error_setg(errp, "Property '%s.%s' has invalid value",
                    object_get_typename(obj), name);
     }

     g_free(value);
 }


 static void nvdimm_init(Object *obj)
 {
     object_property_add(obj, NVDIMM_LABEL_SIZE_PROP, "int",
                         nvdimm_get_label_size, nvdimm_set_label_size, NULL,
                         NULL);

     object_property_add(obj, NVDIMM_UUID_PROP, "QemuUUID", nvdimm_get_uuid,
                         nvdimm_set_uuid, NULL, NULL);
 }

 static void nvdimm_finalize(Object *obj)
 {
     NVDIMMDevice *nvdimm = NVDIMM(obj);

     g_free(nvdimm->nvdimm_mr);
 }

 static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp)
 {
     PCDIMMDevice *dimm = PC_DIMM(nvdimm);
     uint64_t align, pmem_size, size;
     MemoryRegion *mr;

     g_assert(!nvdimm->nvdimm_mr);

     if (!dimm->hostmem) {
         error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
         return;
     }

     mr = host_memory_backend_get_memory(dimm->hostmem);
     align = memory_region_get_alignment(mr);
     size = memory_region_size(mr);

     pmem_size = size - nvdimm->label_size;
     nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
     pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);

     if (size <= nvdimm->label_size || !pmem_size) {
         HostMemoryBackend *hostmem = dimm->hostmem;

         error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too "
                    "small to contain nvdimm label (0x%" PRIx64 ") and "
                    "aligned PMEM (0x%" PRIx64 ")",
                    object_get_canonical_path_component(OBJECT(hostmem)),
                    memory_region_size(mr), nvdimm->label_size, align);
         return;
     }

     if (!nvdimm->unarmed && memory_region_is_rom(mr)) {
         HostMemoryBackend *hostmem = dimm->hostmem;

         error_setg(errp, "'unarmed' property must be 'on' since memdev %s "
                    "is read-only",
                    object_get_canonical_path_component(OBJECT(hostmem)));
         return;
     }
     if (memory_region_is_rom(mr)) {
         nvdimm->readonly = true;
     }

     nvdimm->nvdimm_mr = g_new(MemoryRegion, 1);
     memory_region_init_alias(nvdimm->nvdimm_mr, OBJECT(dimm),
                              "nvdimm-memory", mr, 0, pmem_size);
     memory_region_set_nonvolatile(nvdimm->nvdimm_mr, true);
     nvdimm->nvdimm_mr->align = align;
 }

 static MemoryRegion *nvdimm_md_get_memory_region(MemoryDeviceState *md,
                                                  Error **errp)
 {
     NVDIMMDevice *nvdimm = NVDIMM(md);
     Error *local_err = NULL;

     if (!nvdimm->nvdimm_mr) {
         nvdimm_prepare_memory_region(nvdimm, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             return NULL;
         }
     }
     return nvdimm->nvdimm_mr;
 }

 static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
 {
     NVDIMMDevice *nvdimm = NVDIMM(dimm);
     NVDIMMClass *ndc = NVDIMM_GET_CLASS(nvdimm);

     if (!nvdimm->nvdimm_mr) {
         nvdimm_prepare_memory_region(nvdimm, errp);
     }

     if (ndc->realize) {
         ndc->realize(nvdimm, errp);
     }
 }

 static void nvdimm_unrealize(PCDIMMDevice *dimm)
 {
     NVDIMMDevice *nvdimm = NVDIMM(dimm);
     NVDIMMClass *ndc = NVDIMM_GET_CLASS(nvdimm);

     if (ndc->unrealize) {
         ndc->unrealize(nvdimm);
     }
 }

 /*
  * the caller should check the input parameters before calling
  * label read/write functions.
  */
 static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size,
                                         uint64_t offset, bool is_write)
 {
     assert((nvdimm->label_size >= size + offset) && (offset + size > offset));
     assert(!is_write || !nvdimm->readonly);
 }

 static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf,
                                    uint64_t size, uint64_t offset)
 {
     nvdimm_validate_rw_label_data(nvdimm, size, offset, false);

     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;
     PCDIMMDevice *dimm = PC_DIMM(nvdimm);
     bool is_pmem = object_property_get_bool(OBJECT(dimm->hostmem),
                                             "pmem", NULL);
     uint64_t backend_offset;

     nvdimm_validate_rw_label_data(nvdimm, size, offset, true);

     if (!is_pmem) {
         memcpy(nvdimm->label_data + offset, buf, size);
     } else {
         pmem_memcpy_persist(nvdimm->label_data + offset, buf, size);
     }

     mr = host_memory_backend_get_memory(dimm->hostmem);
     backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
     memory_region_set_dirty(mr, backend_offset, size);
 }

 static Property nvdimm_properties[] = {
     DEFINE_PROP_BOOL(NVDIMM_UNARMED_PROP, NVDIMMDevice, unarmed, false),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void nvdimm_class_init(ObjectClass *oc, void *data)
 {
     PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
     MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
     NVDIMMClass *nvc = NVDIMM_CLASS(oc);
     DeviceClass *dc = DEVICE_CLASS(oc);

     ddc->realize = nvdimm_realize;
     ddc->unrealize = nvdimm_unrealize;
     mdc->get_memory_region = nvdimm_md_get_memory_region;
     device_class_set_props(dc, nvdimm_properties);

     nvc->read_label_data = nvdimm_read_label_data;
     nvc->write_label_data = nvdimm_write_label_data;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 }

 static const TypeInfo nvdimm_info = {
     .name          = TYPE_NVDIMM,
     .parent        = TYPE_PC_DIMM,
     .class_size    = sizeof(NVDIMMClass),
     .class_init    = nvdimm_class_init,
     .instance_size = sizeof(NVDIMMDevice),
     .instance_init = nvdimm_init,
     .instance_finalize = nvdimm_finalize,
 };

 static void nvdimm_register_types(void)
 {
     type_register_static(&nvdimm_info);
 }

 type_init(nvdimm_register_types)
	/*
	* Non-Volatile Dual In-line Memory Module Virtualization Implementation
	*
	* Copyright(C) 2015 Intel Corporation.
	*
	* Author:
	* Xiao Guangrong <guangrong.xiao@linux.intel.com>
	*
	* 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 2.1 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 "qemu/module.h"
	#include "qemu/pmem.h"
	#include "qapi/error.h"
	#include "qapi/visitor.h"
	#include "hw/mem/nvdimm.h"
	#include "hw/qdev-properties.h"
	#include "hw/mem/memory-device.h"
	#include "sysemu/hostmem.h"

	static void nvdimm_get_label_size(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	NVDIMMDevice *nvdimm = NVDIMM(obj);
	uint64_t value = nvdimm->label_size;

	visit_type_size(v, name, &value, errp);
	}

	static void nvdimm_set_label_size(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	NVDIMMDevice *nvdimm = NVDIMM(obj);
	uint64_t value;

	if (nvdimm->nvdimm_mr) {
	error_setg(errp, "cannot change property value");
	return;
	}

	if (!visit_type_size(v, name, &value, errp)) {
	return;
	}
	if (value < MIN_NAMESPACE_LABEL_SIZE) {
	error_setg(errp, "Property '%s.%s' (0x%" PRIx64 ") is required"
	" at least 0x%lx", object_get_typename(obj), name, value,
	MIN_NAMESPACE_LABEL_SIZE);
	return;
	}

	nvdimm->label_size = value;
	}

	static void nvdimm_get_uuid(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	NVDIMMDevice *nvdimm = NVDIMM(obj);
	char *value = NULL;

	value = qemu_uuid_unparse_strdup(&nvdimm->uuid);

	visit_type_str(v, name, &value, errp);
	g_free(value);
	}


	static void nvdimm_set_uuid(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	NVDIMMDevice *nvdimm = NVDIMM(obj);
	char *value;

	if (!visit_type_str(v, name, &value, errp)) {
	return;
	}

	if (qemu_uuid_parse(value, &nvdimm->uuid) != 0) {
	error_setg(errp, "Property '%s.%s' has invalid value",
	object_get_typename(obj), name);
	}

	g_free(value);
	}


	static void nvdimm_init(Object *obj)
	{
	object_property_add(obj, NVDIMM_LABEL_SIZE_PROP, "int",
	nvdimm_get_label_size, nvdimm_set_label_size, NULL,
	NULL);

	object_property_add(obj, NVDIMM_UUID_PROP, "QemuUUID", nvdimm_get_uuid,
	nvdimm_set_uuid, NULL, NULL);
	}

	static void nvdimm_finalize(Object *obj)
	{
	NVDIMMDevice *nvdimm = NVDIMM(obj);

	g_free(nvdimm->nvdimm_mr);
	}

	static void nvdimm_prepare_memory_region(NVDIMMDevice nvdimm, Error *errp)
	{
	PCDIMMDevice *dimm = PC_DIMM(nvdimm);
	uint64_t align, pmem_size, size;
	MemoryRegion *mr;

	g_assert(!nvdimm->nvdimm_mr);

	if (!dimm->hostmem) {
	error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
	return;
	}

	mr = host_memory_backend_get_memory(dimm->hostmem);
	align = memory_region_get_alignment(mr);
	size = memory_region_size(mr);

	pmem_size = size - nvdimm->label_size;
	nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
	pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);

	if (size <= nvdimm->label_size \|\| !pmem_size) {
	HostMemoryBackend *hostmem = dimm->hostmem;

	error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too "
	"small to contain nvdimm label (0x%" PRIx64 ") and "
	"aligned PMEM (0x%" PRIx64 ")",
	object_get_canonical_path_component(OBJECT(hostmem)),
	memory_region_size(mr), nvdimm->label_size, align);
	return;
	}

	if (!nvdimm->unarmed && memory_region_is_rom(mr)) {
	HostMemoryBackend *hostmem = dimm->hostmem;

	error_setg(errp, "'unarmed' property must be 'on' since memdev %s "
	"is read-only",
	object_get_canonical_path_component(OBJECT(hostmem)));
	return;
	}
	if (memory_region_is_rom(mr)) {
	nvdimm->readonly = true;
	}

	nvdimm->nvdimm_mr = g_new(MemoryRegion, 1);
	memory_region_init_alias(nvdimm->nvdimm_mr, OBJECT(dimm),
	"nvdimm-memory", mr, 0, pmem_size);
	memory_region_set_nonvolatile(nvdimm->nvdimm_mr, true);
	nvdimm->nvdimm_mr->align = align;
	}

	static MemoryRegion nvdimm_md_get_memory_region(MemoryDeviceState md,
	Error **errp)
	{
	NVDIMMDevice *nvdimm = NVDIMM(md);
	Error *local_err = NULL;

	if (!nvdimm->nvdimm_mr) {
	nvdimm_prepare_memory_region(nvdimm, &local_err);
	if (local_err) {
	error_propagate(errp, local_err);
	return NULL;
	}
	}
	return nvdimm->nvdimm_mr;
	}

	static void nvdimm_realize(PCDIMMDevice dimm, Error *errp)
	{
	NVDIMMDevice *nvdimm = NVDIMM(dimm);
	NVDIMMClass *ndc = NVDIMM_GET_CLASS(nvdimm);

	if (!nvdimm->nvdimm_mr) {
	nvdimm_prepare_memory_region(nvdimm, errp);
	}

	if (ndc->realize) {
	ndc->realize(nvdimm, errp);
	}
	}

	static void nvdimm_unrealize(PCDIMMDevice *dimm)
	{
	NVDIMMDevice *nvdimm = NVDIMM(dimm);
	NVDIMMClass *ndc = NVDIMM_GET_CLASS(nvdimm);

	if (ndc->unrealize) {
	ndc->unrealize(nvdimm);
	}
	}

	/*
	* the caller should check the input parameters before calling
	* label read/write functions.
	*/
	static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size,
	uint64_t offset, bool is_write)
	{
	assert((nvdimm->label_size >= size + offset) && (offset + size > offset));
	assert(!is_write \|\| !nvdimm->readonly);
	}

	static void nvdimm_read_label_data(NVDIMMDevice nvdimm, void buf,
	uint64_t size, uint64_t offset)
	{
	nvdimm_validate_rw_label_data(nvdimm, size, offset, false);

	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;
	PCDIMMDevice *dimm = PC_DIMM(nvdimm);
	bool is_pmem = object_property_get_bool(OBJECT(dimm->hostmem),
	"pmem", NULL);
	uint64_t backend_offset;

	nvdimm_validate_rw_label_data(nvdimm, size, offset, true);

	if (!is_pmem) {
	memcpy(nvdimm->label_data + offset, buf, size);
	} else {
	pmem_memcpy_persist(nvdimm->label_data + offset, buf, size);
	}

	mr = host_memory_backend_get_memory(dimm->hostmem);
	backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
	memory_region_set_dirty(mr, backend_offset, size);
	}

	static Property nvdimm_properties[] = {
	DEFINE_PROP_BOOL(NVDIMM_UNARMED_PROP, NVDIMMDevice, unarmed, false),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void nvdimm_class_init(ObjectClass oc, void data)
	{
	PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
	MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
	NVDIMMClass *nvc = NVDIMM_CLASS(oc);
	DeviceClass *dc = DEVICE_CLASS(oc);

	ddc->realize = nvdimm_realize;
	ddc->unrealize = nvdimm_unrealize;
	mdc->get_memory_region = nvdimm_md_get_memory_region;
	device_class_set_props(dc, nvdimm_properties);

	nvc->read_label_data = nvdimm_read_label_data;
	nvc->write_label_data = nvdimm_write_label_data;
	set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
	}

	static const TypeInfo nvdimm_info = {
	.name = TYPE_NVDIMM,
	.parent = TYPE_PC_DIMM,
	.class_size = sizeof(NVDIMMClass),
	.class_init = nvdimm_class_init,
	.instance_size = sizeof(NVDIMMDevice),
	.instance_init = nvdimm_init,
	.instance_finalize = nvdimm_finalize,
	};

	static void nvdimm_register_types(void)
	{
	type_register_static(&nvdimm_info);
	}

	type_init(nvdimm_register_types)