shared/OpenglCodecCommon/goldfish_address_space_android.impl - third_party/android/device/generic/goldfish-opengl - Git at Google

 // Copyright (C) 2019 The Android Open Source Project
 // Copyright (C) 2019 Google Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 // http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include <linux/types.h>
 #include <linux/ioctl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <cstdlib>
 #include <errno.h>
 #include <memory>

 #if PLATFORM_SDK_VERSION < 26
 #include <cutils/log.h>
 #else
 #include <log/log.h>
 #endif

 #include "goldfish_address_space.h"

 namespace {

 struct goldfish_address_space_allocate_block {
     __u64 size;
     __u64 offset;
     __u64 phys_addr;
 };

 struct goldfish_address_space_claim_shared {
     __u64 offset;
     __u64 size;
 };

 #define GOLDFISH_ADDRESS_SPACE_IOCTL_MAGIC		'G'
 #define GOLDFISH_ADDRESS_SPACE_IOCTL_OP(OP, T)		_IOWR(GOLDFISH_ADDRESS_SPACE_IOCTL_MAGIC, OP, T)
 #define GOLDFISH_ADDRESS_SPACE_IOCTL_ALLOCATE_BLOCK	GOLDFISH_ADDRESS_SPACE_IOCTL_OP(10, struct goldfish_address_space_allocate_block)
 #define GOLDFISH_ADDRESS_SPACE_IOCTL_DEALLOCATE_BLOCK	GOLDFISH_ADDRESS_SPACE_IOCTL_OP(11, __u64)
 #define GOLDFISH_ADDRESS_SPACE_IOCTL_PING		GOLDFISH_ADDRESS_SPACE_IOCTL_OP(12, struct goldfish_address_space_ping)
 #define GOLDFISH_ADDRESS_SPACE_IOCTL_CLAIM_SHARED		GOLDFISH_ADDRESS_SPACE_IOCTL_OP(13, struct goldfish_address_space_claim_shared)
 #define GOLDFISH_ADDRESS_SPACE_IOCTL_UNCLAIM_SHARED		GOLDFISH_ADDRESS_SPACE_IOCTL_OP(14, __u64)

 const char GOLDFISH_ADDRESS_SPACE_DEVICE_NAME[] = "/dev/goldfish_address_space";

 const int HOST_MEMORY_ALLOCATOR_COMMAND_ALLOCATE_ID = 1;
 const int HOST_MEMORY_ALLOCATOR_COMMAND_UNALLOCATE_ID = 2;

 int create_address_space_fd()
 {
     return ::open(GOLDFISH_ADDRESS_SPACE_DEVICE_NAME, O_RDWR);
 }

 long ioctl_allocate(int fd, struct goldfish_address_space_allocate_block *request)
 {
     return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_ALLOCATE_BLOCK, request);
 }

 long ioctl_deallocate(int fd, uint64_t offset)
 {
     return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_DEALLOCATE_BLOCK, &offset);
 }

 long ioctl_ping(int fd, struct goldfish_address_space_ping *request)
 {
     return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_PING, request);
 }

 long set_address_space_subdevice_type(int fd, uint64_t type)
 {
     struct goldfish_address_space_ping request;
     ::memset(&request, 0, sizeof(request));
     request.version = sizeof(request);
     request.metadata = type;

     return ioctl_ping(fd, &request);
 }

 long ioctl_claim_shared(int fd, struct goldfish_address_space_claim_shared *request)
 {
     return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_CLAIM_SHARED, request);
 }

 long ioctl_unclaim_shared(int fd, uint64_t offset)
 {
     return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_UNCLAIM_SHARED, &offset);
 }

 }  // namespace

 GoldfishAddressSpaceBlockProvider::GoldfishAddressSpaceBlockProvider(GoldfishAddressSpaceSubdeviceType subdevice)
   : m_handle(create_address_space_fd())
 {
     if ((subdevice != GoldfishAddressSpaceSubdeviceType::NoSubdevice) && is_opened()) {
         const long ret = set_address_space_subdevice_type(m_handle, subdevice);
         if (ret) {
             ALOGE("%s: set_address_space_subdevice_type failed for device_type=%lu, ret=%ld",
                   __func__, static_cast<unsigned long>(subdevice), ret);
             close();
         }
     }
 }

 GoldfishAddressSpaceBlockProvider::~GoldfishAddressSpaceBlockProvider()
 {
     if (is_opened()) {
         ::close(m_handle);
     }
 }

 bool GoldfishAddressSpaceBlockProvider::is_opened() const
 {
     return m_handle >= 0;
 }

 void GoldfishAddressSpaceBlockProvider::close()
 {
     if (is_opened()) {
         ::close(m_handle);
         m_handle = -1;
     }
 }

 address_space_handle_t GoldfishAddressSpaceBlockProvider::release()
 {
     address_space_handle_t handle = m_handle;
     m_handle = -1;
     return handle;
 }

 void GoldfishAddressSpaceBlockProvider::closeHandle(address_space_handle_t handle)
 {
     ::close(handle);
 }

 GoldfishAddressSpaceBlock::GoldfishAddressSpaceBlock()
     : m_handle(-1)
     , m_mmaped_ptr(NULL)
     , m_phys_addr(0)
     , m_host_addr(0)
     , m_offset(0)
     , m_size(0) {}

 GoldfishAddressSpaceBlock::~GoldfishAddressSpaceBlock()
 {
     destroy();
 }

 GoldfishAddressSpaceBlock &GoldfishAddressSpaceBlock::operator=(const GoldfishAddressSpaceBlock &rhs)
 {
     m_mmaped_ptr = rhs.m_mmaped_ptr;
     m_phys_addr = rhs.m_phys_addr;
     m_host_addr = rhs.m_host_addr;
     m_offset = rhs.m_offset;
     m_size = rhs.m_size;
     m_handle = rhs.m_handle;

     return *this;
 }

 bool GoldfishAddressSpaceBlock::allocate(GoldfishAddressSpaceBlockProvider *provider, size_t size)
 {
     ALOGD("%s: Ask for block of size 0x%llx\n", __func__,
          (unsigned long long)size);

     destroy();

     if (!provider->is_opened()) {
         return false;
     }

     struct goldfish_address_space_allocate_block request;
     ::memset(&request, 0, sizeof(request));
     request.size = size;

     long res = ioctl_allocate(provider->m_handle, &request);
     if (res) {
         return false;
     } else {
         m_phys_addr = request.phys_addr;
         m_offset = request.offset;
         m_size = request.size;
         m_handle = provider->m_handle;
         m_is_shared_mapping = false;

         ALOGD("%s: ioctl allocate returned offset 0x%llx size 0x%llx\n", __func__,
                 (unsigned long long)m_offset,
                 (unsigned long long)m_size);

         return true;
     }
 }

 bool GoldfishAddressSpaceBlock::claimShared(GoldfishAddressSpaceBlockProvider *provider, uint64_t offset, uint64_t size)
 {
     ALOGD("%s: Ask to claim region [0x%llx 0x%llx]\n", __func__,
          (unsigned long long)offset,
          (unsigned long long)offset + size);

     destroy();

     if (!provider->is_opened()) {
         return false;
     }

     struct goldfish_address_space_claim_shared request;
     request.offset = offset;
     request.size = size;
     long res = ioctl_claim_shared(provider->m_handle, &request);

     if (res) {
         return false;
     }

     m_offset = offset;
     m_size = size;
     m_handle = provider->m_handle;
     m_is_shared_mapping = true;

     return true;
 }

 uint64_t GoldfishAddressSpaceBlock::physAddr() const
 {
     return m_phys_addr;
 }

 uint64_t GoldfishAddressSpaceBlock::hostAddr() const
 {
     return m_host_addr;
 }

 void *GoldfishAddressSpaceBlock::mmap(uint64_t host_addr)
 {
     if (m_size == 0) {
         ALOGE("%s: called with zero size\n", __func__);
         return NULL;
     }
     if (m_mmaped_ptr) {
         ALOGE("'mmap' called for an already mmaped address block");
         ::abort();
     }

     void *result;
     const int res = memoryMap(NULL, m_size, m_handle, m_offset, &result);
     if (res) {
         ALOGE("%s: host memory map failed with size 0x%llx "
               "off 0x%llx errno %d\n",
               __func__,
               (unsigned long long)m_size,
               (unsigned long long)m_offset, res);
         return NULL;
     } else {
         m_mmaped_ptr = result;
         m_host_addr = host_addr;
         return guestPtr();
     }
 }

 void *GoldfishAddressSpaceBlock::guestPtr() const
 {
     return reinterpret_cast<char *>(m_mmaped_ptr) + (m_host_addr & (PAGE_SIZE - 1));
 }

 void GoldfishAddressSpaceBlock::destroy()
 {
     if (m_mmaped_ptr && m_size) {
         memoryUnmap(m_mmaped_ptr, m_size);
         m_mmaped_ptr = NULL;
     }

     if (m_size) {
         long res = -EINVAL;

         if (m_is_shared_mapping) {
             res = ioctl_unclaim_shared(m_handle, m_offset);
             if (res) {
                 ALOGE("ioctl_unclaim_shared failed, res=%ld", res);
                 ::abort();
             }
         } else {
             res = ioctl_deallocate(m_handle, m_offset);
             if (res) {
                 ALOGE("ioctl_deallocate failed, res=%ld", res);
                 ::abort();
             }
         }

         m_is_shared_mapping = false;

         m_phys_addr = 0;
         m_host_addr = 0;
         m_offset = 0;
         m_size = 0;
     }
 }

 void GoldfishAddressSpaceBlock::release()
 {
     m_handle = -1;
     m_mmaped_ptr = NULL;
     m_phys_addr = 0;
     m_host_addr = 0;
     m_offset = 0;
     m_size = 0;
 }

 int GoldfishAddressSpaceBlock::memoryMap(void *addr,
                                          size_t len,
                                          address_space_handle_t fd,
                                          uint64_t off,
                                          void** dst) {
     void* ptr = ::mmap64(addr, len, PROT_WRITE, MAP_SHARED, fd, off);
     if (MAP_FAILED == ptr) {
         return errno;
     } else {
         *dst = ptr;
         return 0;
     }
 }

 void GoldfishAddressSpaceBlock::memoryUnmap(void *ptr, size_t size)
 {
     ::munmap(ptr, size);
 }

 GoldfishAddressSpaceHostMemoryAllocator::GoldfishAddressSpaceHostMemoryAllocator()
   : m_provider(GoldfishAddressSpaceSubdeviceType::HostMemoryAllocator) {}

 bool GoldfishAddressSpaceHostMemoryAllocator::is_opened() const { return m_provider.is_opened(); }

 long GoldfishAddressSpaceHostMemoryAllocator::hostMalloc(GoldfishAddressSpaceBlock *block, size_t size)
 {
     if (size == 0) {
         return -EINVAL;
     }
     if (block->size() > 0) {
         return -EINVAL;
     }
     if (!m_provider.is_opened()) {
         return -ENODEV;
     }
     if (!block->allocate(&m_provider, size)) {
         return -ENOMEM;
     }

     struct goldfish_address_space_ping request;
     ::memset(&request, 0, sizeof(request));
     request.version = sizeof(request);
     request.offset = block->offset();
     request.size = block->size();
     request.metadata = HOST_MEMORY_ALLOCATOR_COMMAND_ALLOCATE_ID;

     long ret = ioctl_ping(m_provider.m_handle, &request);
     if (ret) {
         return ret;
     }
     ret = static_cast<long>(request.metadata);
     if (ret) {
         return ret;
     }

     block->mmap(0);
     return 0;
 }

 void GoldfishAddressSpaceHostMemoryAllocator::hostFree(GoldfishAddressSpaceBlock *block)
 {
     if (block->size() == 0) {
         return;
     }

     if (!m_provider.is_opened()) {
         ALOGE("%s: device is not available", __func__);
         ::abort();
     }

     if (block->guestPtr()) {
         struct goldfish_address_space_ping request;
         ::memset(&request, 0, sizeof(request));
         request.version = sizeof(request);
         request.offset = block->offset();
         request.metadata = HOST_MEMORY_ALLOCATOR_COMMAND_UNALLOCATE_ID;

         const long ret = ioctl_ping(m_provider.m_handle, &request);
         if (ret) {
             ALOGE("%s: ioctl_ping failed, ret=%ld", __func__, ret);
             ::abort();
         }
     }

     block->replace(NULL);
 }

 address_space_handle_t goldfish_address_space_open() {
     return ::open(GOLDFISH_ADDRESS_SPACE_DEVICE_NAME, O_RDWR);
 }

 void goldfish_address_space_close(address_space_handle_t handle) {
     ::close(handle);
 }

 bool goldfish_address_space_allocate(
     address_space_handle_t handle,
     size_t size, uint64_t* phys_addr, uint64_t* offset) {

     struct goldfish_address_space_allocate_block request;
     ::memset(&request, 0, sizeof(request));
     request.size = size;

     long res = ioctl_allocate(handle, &request);

     if (res) return false;

     *phys_addr = request.phys_addr;
     *offset = request.offset;
     return true;
 }

 bool goldfish_address_space_free(
     address_space_handle_t handle, uint64_t offset) {

     long res = ioctl_deallocate(handle, offset);

     if (res) {
         ALOGE("ioctl_deallocate failed, res=%ld", res);
         ::abort();
     }

     return true;
 }

 bool goldfish_address_space_claim_shared(
     address_space_handle_t handle, uint64_t offset, uint64_t size) {

     struct goldfish_address_space_claim_shared request;
     request.offset = offset;
     request.size = size;
     long res = ioctl_claim_shared(handle, &request);

     if (res) return false;

     return true;
 }

 bool goldfish_address_space_unclaim_shared(
         address_space_handle_t handle, uint64_t offset) {
     long res = ioctl_unclaim_shared(handle, offset);
     if (res) {
         ALOGE("ioctl_unclaim_shared failed, res=%ld", res);
         ::abort();
     }

     return true;
 }

 // pgoff is the offset into the page to return in the result
 void* goldfish_address_space_map(
     address_space_handle_t handle,
     uint64_t offset, uint64_t size,
     uint64_t pgoff) {

     void* res = ::mmap64(0, size, PROT_WRITE, MAP_SHARED, handle, offset);

     if (res == MAP_FAILED) {
         ALOGE("%s: failed to map. errno: %d\n", __func__, errno);
         return 0;
     }

     return (void*)(((char*)res) + (uintptr_t)(pgoff & (PAGE_SIZE - 1)));
 }

 void goldfish_address_space_unmap(void* ptr, uint64_t size) {
     void* pagePtr = (void*)(((uintptr_t)ptr) & ~(PAGE_SIZE - 1));
     ::munmap(pagePtr, size);
 }

 bool goldfish_address_space_set_subdevice_type(
     address_space_handle_t handle, GoldfishAddressSpaceSubdeviceType type,
     address_space_handle_t* handle_out) {
     struct goldfish_address_space_ping request;
     request.metadata = (uint64_t)type;
     *handle_out = handle;
     return goldfish_address_space_ping(handle, &request);
 }

 bool goldfish_address_space_ping(
     address_space_handle_t handle,
     struct goldfish_address_space_ping* ping) {
     long res = ioctl_ping(handle, ping);

     if (res) {
         ALOGE("%s: ping failed: errno: %d\n", __func__, errno);
         return false;
     }

     return true;
 }
	// Copyright (C) 2019 The Android Open Source Project
	// Copyright (C) 2019 Google Inc.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include <linux/types.h>
	#include <linux/ioctl.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/mman.h>
	#include <sys/ioctl.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <cstdlib>
	#include <errno.h>
	#include <memory>

	#if PLATFORM_SDK_VERSION < 26
	#include <cutils/log.h>
	#else
	#include <log/log.h>
	#endif

	#include "goldfish_address_space.h"

	namespace {

	struct goldfish_address_space_allocate_block {
	__u64 size;
	__u64 offset;
	__u64 phys_addr;
	};

	struct goldfish_address_space_claim_shared {
	__u64 offset;
	__u64 size;
	};

	#define GOLDFISH_ADDRESS_SPACE_IOCTL_MAGIC 'G'
	#define GOLDFISH_ADDRESS_SPACE_IOCTL_OP(OP, T) _IOWR(GOLDFISH_ADDRESS_SPACE_IOCTL_MAGIC, OP, T)
	#define GOLDFISH_ADDRESS_SPACE_IOCTL_ALLOCATE_BLOCK GOLDFISH_ADDRESS_SPACE_IOCTL_OP(10, struct goldfish_address_space_allocate_block)
	#define GOLDFISH_ADDRESS_SPACE_IOCTL_DEALLOCATE_BLOCK GOLDFISH_ADDRESS_SPACE_IOCTL_OP(11, __u64)
	#define GOLDFISH_ADDRESS_SPACE_IOCTL_PING GOLDFISH_ADDRESS_SPACE_IOCTL_OP(12, struct goldfish_address_space_ping)
	#define GOLDFISH_ADDRESS_SPACE_IOCTL_CLAIM_SHARED GOLDFISH_ADDRESS_SPACE_IOCTL_OP(13, struct goldfish_address_space_claim_shared)
	#define GOLDFISH_ADDRESS_SPACE_IOCTL_UNCLAIM_SHARED GOLDFISH_ADDRESS_SPACE_IOCTL_OP(14, __u64)

	const char GOLDFISH_ADDRESS_SPACE_DEVICE_NAME[] = "/dev/goldfish_address_space";

	const int HOST_MEMORY_ALLOCATOR_COMMAND_ALLOCATE_ID = 1;
	const int HOST_MEMORY_ALLOCATOR_COMMAND_UNALLOCATE_ID = 2;

	int create_address_space_fd()
	{
	return ::open(GOLDFISH_ADDRESS_SPACE_DEVICE_NAME, O_RDWR);
	}

	long ioctl_allocate(int fd, struct goldfish_address_space_allocate_block *request)
	{
	return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_ALLOCATE_BLOCK, request);
	}

	long ioctl_deallocate(int fd, uint64_t offset)
	{
	return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_DEALLOCATE_BLOCK, &offset);
	}

	long ioctl_ping(int fd, struct goldfish_address_space_ping *request)
	{
	return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_PING, request);
	}

	long set_address_space_subdevice_type(int fd, uint64_t type)
	{
	struct goldfish_address_space_ping request;
	::memset(&request, 0, sizeof(request));
	request.version = sizeof(request);
	request.metadata = type;

	return ioctl_ping(fd, &request);
	}

	long ioctl_claim_shared(int fd, struct goldfish_address_space_claim_shared *request)
	{
	return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_CLAIM_SHARED, request);
	}

	long ioctl_unclaim_shared(int fd, uint64_t offset)
	{
	return ::ioctl(fd, GOLDFISH_ADDRESS_SPACE_IOCTL_UNCLAIM_SHARED, &offset);
	}

	} // namespace

	GoldfishAddressSpaceBlockProvider::GoldfishAddressSpaceBlockProvider(GoldfishAddressSpaceSubdeviceType subdevice)
	: m_handle(create_address_space_fd())
	{
	if ((subdevice != GoldfishAddressSpaceSubdeviceType::NoSubdevice) && is_opened()) {
	const long ret = set_address_space_subdevice_type(m_handle, subdevice);
	if (ret) {
	ALOGE("%s: set_address_space_subdevice_type failed for device_type=%lu, ret=%ld",
	__func__, static_cast<unsigned long>(subdevice), ret);
	close();
	}
	}
	}

	GoldfishAddressSpaceBlockProvider::~GoldfishAddressSpaceBlockProvider()
	{
	if (is_opened()) {
	::close(m_handle);
	}
	}

	bool GoldfishAddressSpaceBlockProvider::is_opened() const
	{
	return m_handle >= 0;
	}

	void GoldfishAddressSpaceBlockProvider::close()
	{
	if (is_opened()) {
	::close(m_handle);
	m_handle = -1;
	}
	}

	address_space_handle_t GoldfishAddressSpaceBlockProvider::release()
	{
	address_space_handle_t handle = m_handle;
	m_handle = -1;
	return handle;
	}

	void GoldfishAddressSpaceBlockProvider::closeHandle(address_space_handle_t handle)
	{
	::close(handle);
	}

	GoldfishAddressSpaceBlock::GoldfishAddressSpaceBlock()
	: m_handle(-1)
	, m_mmaped_ptr(NULL)
	, m_phys_addr(0)
	, m_host_addr(0)
	, m_offset(0)
	, m_size(0) {}

	GoldfishAddressSpaceBlock::~GoldfishAddressSpaceBlock()
	{
	destroy();
	}

	GoldfishAddressSpaceBlock &GoldfishAddressSpaceBlock::operator=(const GoldfishAddressSpaceBlock &rhs)
	{
	m_mmaped_ptr = rhs.m_mmaped_ptr;
	m_phys_addr = rhs.m_phys_addr;
	m_host_addr = rhs.m_host_addr;
	m_offset = rhs.m_offset;
	m_size = rhs.m_size;
	m_handle = rhs.m_handle;

	return *this;
	}

	bool GoldfishAddressSpaceBlock::allocate(GoldfishAddressSpaceBlockProvider *provider, size_t size)
	{
	ALOGD("%s: Ask for block of size 0x%llx\n", __func__,
	(unsigned long long)size);

	destroy();

	if (!provider->is_opened()) {
	return false;
	}

	struct goldfish_address_space_allocate_block request;
	::memset(&request, 0, sizeof(request));
	request.size = size;

	long res = ioctl_allocate(provider->m_handle, &request);
	if (res) {
	return false;
	} else {
	m_phys_addr = request.phys_addr;
	m_offset = request.offset;
	m_size = request.size;
	m_handle = provider->m_handle;
	m_is_shared_mapping = false;

	ALOGD("%s: ioctl allocate returned offset 0x%llx size 0x%llx\n", __func__,
	(unsigned long long)m_offset,
	(unsigned long long)m_size);

	return true;
	}
	}

	bool GoldfishAddressSpaceBlock::claimShared(GoldfishAddressSpaceBlockProvider *provider, uint64_t offset, uint64_t size)
	{
	ALOGD("%s: Ask to claim region [0x%llx 0x%llx]\n", __func__,
	(unsigned long long)offset,
	(unsigned long long)offset + size);

	destroy();

	if (!provider->is_opened()) {
	return false;
	}

	struct goldfish_address_space_claim_shared request;
	request.offset = offset;
	request.size = size;
	long res = ioctl_claim_shared(provider->m_handle, &request);

	if (res) {
	return false;
	}

	m_offset = offset;
	m_size = size;
	m_handle = provider->m_handle;
	m_is_shared_mapping = true;

	return true;
	}

	uint64_t GoldfishAddressSpaceBlock::physAddr() const
	{
	return m_phys_addr;
	}

	uint64_t GoldfishAddressSpaceBlock::hostAddr() const
	{
	return m_host_addr;
	}

	void *GoldfishAddressSpaceBlock::mmap(uint64_t host_addr)
	{
	if (m_size == 0) {
	ALOGE("%s: called with zero size\n", __func__);
	return NULL;
	}
	if (m_mmaped_ptr) {
	ALOGE("'mmap' called for an already mmaped address block");
	::abort();
	}

	void *result;
	const int res = memoryMap(NULL, m_size, m_handle, m_offset, &result);
	if (res) {
	ALOGE("%s: host memory map failed with size 0x%llx "
	"off 0x%llx errno %d\n",
	__func__,
	(unsigned long long)m_size,
	(unsigned long long)m_offset, res);
	return NULL;
	} else {
	m_mmaped_ptr = result;
	m_host_addr = host_addr;
	return guestPtr();
	}
	}

	void *GoldfishAddressSpaceBlock::guestPtr() const
	{
	return reinterpret_cast<char *>(m_mmaped_ptr) + (m_host_addr & (PAGE_SIZE - 1));
	}

	void GoldfishAddressSpaceBlock::destroy()
	{
	if (m_mmaped_ptr && m_size) {
	memoryUnmap(m_mmaped_ptr, m_size);
	m_mmaped_ptr = NULL;
	}

	if (m_size) {
	long res = -EINVAL;

	if (m_is_shared_mapping) {
	res = ioctl_unclaim_shared(m_handle, m_offset);
	if (res) {
	ALOGE("ioctl_unclaim_shared failed, res=%ld", res);
	::abort();
	}
	} else {
	res = ioctl_deallocate(m_handle, m_offset);
	if (res) {
	ALOGE("ioctl_deallocate failed, res=%ld", res);
	::abort();
	}
	}

	m_is_shared_mapping = false;

	m_phys_addr = 0;
	m_host_addr = 0;
	m_offset = 0;
	m_size = 0;
	}
	}

	void GoldfishAddressSpaceBlock::release()
	{
	m_handle = -1;
	m_mmaped_ptr = NULL;
	m_phys_addr = 0;
	m_host_addr = 0;
	m_offset = 0;
	m_size = 0;
	}

	int GoldfishAddressSpaceBlock::memoryMap(void *addr,
	size_t len,
	address_space_handle_t fd,
	uint64_t off,
	void** dst) {
	void* ptr = ::mmap64(addr, len, PROT_WRITE, MAP_SHARED, fd, off);
	if (MAP_FAILED == ptr) {
	return errno;
	} else {
	*dst = ptr;
	return 0;
	}
	}

	void GoldfishAddressSpaceBlock::memoryUnmap(void *ptr, size_t size)
	{
	::munmap(ptr, size);
	}

	GoldfishAddressSpaceHostMemoryAllocator::GoldfishAddressSpaceHostMemoryAllocator()
	: m_provider(GoldfishAddressSpaceSubdeviceType::HostMemoryAllocator) {}

	bool GoldfishAddressSpaceHostMemoryAllocator::is_opened() const { return m_provider.is_opened(); }

	long GoldfishAddressSpaceHostMemoryAllocator::hostMalloc(GoldfishAddressSpaceBlock *block, size_t size)
	{
	if (size == 0) {
	return -EINVAL;
	}
	if (block->size() > 0) {
	return -EINVAL;
	}
	if (!m_provider.is_opened()) {
	return -ENODEV;
	}
	if (!block->allocate(&m_provider, size)) {
	return -ENOMEM;
	}

	struct goldfish_address_space_ping request;
	::memset(&request, 0, sizeof(request));
	request.version = sizeof(request);
	request.offset = block->offset();
	request.size = block->size();
	request.metadata = HOST_MEMORY_ALLOCATOR_COMMAND_ALLOCATE_ID;

	long ret = ioctl_ping(m_provider.m_handle, &request);
	if (ret) {
	return ret;
	}
	ret = static_cast<long>(request.metadata);
	if (ret) {
	return ret;
	}

	block->mmap(0);
	return 0;
	}

	void GoldfishAddressSpaceHostMemoryAllocator::hostFree(GoldfishAddressSpaceBlock *block)
	{
	if (block->size() == 0) {
	return;
	}

	if (!m_provider.is_opened()) {
	ALOGE("%s: device is not available", __func__);
	::abort();
	}

	if (block->guestPtr()) {
	struct goldfish_address_space_ping request;
	::memset(&request, 0, sizeof(request));
	request.version = sizeof(request);
	request.offset = block->offset();
	request.metadata = HOST_MEMORY_ALLOCATOR_COMMAND_UNALLOCATE_ID;

	const long ret = ioctl_ping(m_provider.m_handle, &request);
	if (ret) {
	ALOGE("%s: ioctl_ping failed, ret=%ld", __func__, ret);
	::abort();
	}
	}

	block->replace(NULL);
	}

	address_space_handle_t goldfish_address_space_open() {
	return ::open(GOLDFISH_ADDRESS_SPACE_DEVICE_NAME, O_RDWR);
	}

	void goldfish_address_space_close(address_space_handle_t handle) {
	::close(handle);
	}

	bool goldfish_address_space_allocate(
	address_space_handle_t handle,
	size_t size, uint64_t* phys_addr, uint64_t* offset) {

	struct goldfish_address_space_allocate_block request;
	::memset(&request, 0, sizeof(request));
	request.size = size;

	long res = ioctl_allocate(handle, &request);

	if (res) return false;

	*phys_addr = request.phys_addr;
	*offset = request.offset;
	return true;
	}

	bool goldfish_address_space_free(
	address_space_handle_t handle, uint64_t offset) {

	long res = ioctl_deallocate(handle, offset);

	if (res) {
	ALOGE("ioctl_deallocate failed, res=%ld", res);
	::abort();
	}

	return true;
	}

	bool goldfish_address_space_claim_shared(
	address_space_handle_t handle, uint64_t offset, uint64_t size) {

	struct goldfish_address_space_claim_shared request;
	request.offset = offset;
	request.size = size;
	long res = ioctl_claim_shared(handle, &request);

	if (res) return false;

	return true;
	}

	bool goldfish_address_space_unclaim_shared(
	address_space_handle_t handle, uint64_t offset) {
	long res = ioctl_unclaim_shared(handle, offset);
	if (res) {
	ALOGE("ioctl_unclaim_shared failed, res=%ld", res);
	::abort();
	}

	return true;
	}

	// pgoff is the offset into the page to return in the result
	void* goldfish_address_space_map(
	address_space_handle_t handle,
	uint64_t offset, uint64_t size,
	uint64_t pgoff) {

	void* res = ::mmap64(0, size, PROT_WRITE, MAP_SHARED, handle, offset);

	if (res == MAP_FAILED) {
	ALOGE("%s: failed to map. errno: %d\n", __func__, errno);
	return 0;
	}

	return (void)(((char)res) + (uintptr_t)(pgoff & (PAGE_SIZE - 1)));
	}

	void goldfish_address_space_unmap(void* ptr, uint64_t size) {
	void* pagePtr = (void*)(((uintptr_t)ptr) & ~(PAGE_SIZE - 1));
	::munmap(pagePtr, size);
	}

	bool goldfish_address_space_set_subdevice_type(
	address_space_handle_t handle, GoldfishAddressSpaceSubdeviceType type,
	address_space_handle_t* handle_out) {
	struct goldfish_address_space_ping request;
	request.metadata = (uint64_t)type;
	*handle_out = handle;
	return goldfish_address_space_ping(handle, &request);
	}

	bool goldfish_address_space_ping(
	address_space_handle_t handle,
	struct goldfish_address_space_ping* ping) {
	long res = ioctl_ping(handle, ping);

	if (res) {
	ALOGE("%s: ping failed: errno: %d\n", __func__, errno);
	return false;
	}

	return true;
	}