Kernel: Add video memory driver

drivers/video/Kconfig

@@ -5,6 +5,8 @@
 
 menu "Graphics support"
 
+source "drivers/video/video_memory/Kconfig"
+
 if HAS_IOMEM
 
 config HAVE_FB_ATMEL

drivers/video/Makefile

@@ -13,3 +13,5 @@ obj-$(CONFIG_VIDEOMODE_HELPERS) += display_timing.o videomode.o
 ifeq ($(CONFIG_OF),y)
 obj-$(CONFIG_VIDEOMODE_HELPERS) += of_display_timing.o of_videomode.o
 endif
+
+obj-$(CONFIG_VIDEO_MEMORY)	+= video_memory/driver/

drivers/video/video_memory/Kconfig

@@ -0,0 +1,4 @@
+config VIDEO_MEMORY
+    tristate "Video memory driver support"
+    default m
+

drivers/video/video_memory/Makefile

@@ -0,0 +1,116 @@
+##
+ # Copyright (C) 2020 Alibaba Group Holding Limited
+##
+ifneq ($(wildcard ../.param),)
+  include ../.param
+endif
+
+#CONFIG_DEBUG_MODE=1
+CONFIG_OUT_ENV=hwlinux
+
+CONFIG_BUILD_DRV_EXTRA_PARAM:=""    	
+CONFIG_BUILD_LIB_EXTRA_PARAM:=""
+CONFIG_BUILD_TST_EXTRA_PARAM:=""	
+
+DIR_TARGET_BASE=bsp/vidmem		
+DIR_TARGET_KO  =bsp/vidmem/ko
+DIR_TARGET_TEST=bsp/vidmem/test
+
+MODULE_NAME=vidmem
+BUILD_LOG_START="\033[47;30m>>> $(MODULE_NAME) $@ begin\033[0m"
+BUILD_LOG_END  ="\033[47;30m<<< $(MODULE_NAME) $@ end\033[0m"
+
+#
+# Do a parallel build with multiple jobs, based on the number of CPUs online
+# in this system: 'make -j8' on a 8-CPU system, etc.
+#
+# (To override it, run 'make JOBS=1' and similar.)
+#
+
+ifeq ($(JOBS),)
+  JOBS := $(shell grep -c ^processor /proc/cpuinfo 2>/dev/null)
+  ifeq ($(JOBS),)
+    JOBS := 1
+  endif
+endif
+
+all:    info driver lib test install_local_output install_rootfs
+.PHONY: info driver lib test install_local_output install_rootfs \
+        install_prepare install_addons clean_driver clean_test clean_output clean
+
+info:
+	@echo $(BUILD_LOG_START)
+	@echo "  ====== Build Info from repo project ======"
+	@echo "    BUILDROOT_DIR="$(BUILDROOT_DIR)
+	@echo "    CROSS_COMPILE="$(CROSS_COMPILE)
+	@echo "    LINUX_DIR="$(LINUX_DIR)
+	@echo "    ARCH="$(ARCH)
+	@echo "    BOARD_NAME="$(BOARD_NAME)
+	@echo "    KERNEL_ID="$(KERNELVERSION)
+	@echo "    KERNEL_DIR="$(LINUX_DIR)
+	@echo "    INSTALL_DIR_ROOTFS="$(INSTALL_DIR_ROOTFS)
+	@echo "    INSTALL_DIR_SDK="$(INSTALL_DIR_SDK)
+	@echo "  ====== Build configuration by settings ======"
+#	@echo "    CONFIG_DEBUG_MODE="$(CONFIG_DEBUG_MODE)
+	@echo "    CONFIG_OUT_ENV="$(CONFIG_OUT_ENV)
+	@echo "    JOBS="$(JOBS)
+	@echo $(BUILD_LOG_END)
+
+driver:
+	@echo $(BUILD_LOG_START)
+	make -C $(LINUX_DIR) M=$(PWD)/driver ARCH=$(ARCH) modules
+	@echo $(BUILD_LOG_END)
+
+clean_driver:
+	@echo $(BUILD_LOG_START)
+	make -C driver KDIR=$(LINUX_DIR) clean
+	@echo $(BUILD_LOG_END)
+
+lib:
+	@echo $(BUILD_LOG_START)
+	make -w -C lib
+	@echo $(BUILD_LOG_END)
+
+clean_lib:
+	@echo $(BUILD_LOG_START)
+	make -C lib KDIR=$(LINUX_DIR) clean
+	@echo $(BUILD_LOG_END)
+
+test: driver
+	@echo $(BUILD_LOG_START)
+	make -w -C test hwlinux
+	@echo $(BUILD_LOG_END)
+
+clean_test:
+	@echo $(BUILD_LOG_START)
+	make clean -C test
+	@echo $(BUILD_LOG_END)
+
+install_prepare:
+	mkdir -p ./output/rootfs/$(DIR_TARGET_KO)
+	mkdir -p ./output/rootfs/$(DIR_TARGET_TEST)
+
+install_addons: install_prepare
+	@echo $(BUILD_LOG_START)
+	@echo $(BUILD_LOG_END)
+
+install_local_output: driver lib test install_addons
+	@echo $(BUILD_LOG_START)
+	find ./driver -name "*.ko" | xargs -i cp -f {} ./output/rootfs/$(DIR_TARGET_KO)
+	cp -f ./test/vidmem_test ./output/rootfs/$(DIR_TARGET_TEST)
+	@if [ `command -v tree` != "" ]; then \
+	    tree ./output/rootfs;             \
+	fi
+	@echo $(BUILD_LOG_END)
+
+install_rootfs: install_local_output
+	@echo $(BUILD_LOG_START)
+	@echo $(BUILD_LOG_END)
+
+clean_output:
+	@echo $(BUILD_LOG_START)
+	rm -rf ./output
+	@echo $(BUILD_LOG_END)
+
+clean: clean_output clean_driver clean_lib clean_test
+

drivers/video/video_memory/README.md

@@ -0,0 +1,3 @@
+# How to build
+
+# Description of each directories

drivers/video/video_memory/driver/Makefile

@@ -0,0 +1,47 @@
+# Copyright 2018 VeriSilicon. All Rights Reserved.
+# 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+# USA.
+
+DEBUG ?= n
+ifeq ($(DEBUG),y)
+  DEBFLAGS = -O -g -DVIDMEM_DEBUG
+else
+  DEBFLAGS = -O2
+endif
+
+EXTRA_CFLAGS += $(DEBFLAGS)
+
+ifneq ($(KERNELRELEASE),)
+# recursive call from kernel build system
+
+vidmem-objs := video_memory.o rsvmem_pool.o
+obj-m         += vidmem.o
+
+else
+
+#KDIR := /export/Testing/Board_Version_Control/SW_Common/SOCLE_MDK-3D/openlinux/2.6.29/v0_5/android_linux-2.6.29
+KVER := $(shell uname -r)
+KDIR := /lib/modules/$(KVER)/build
+
+PWD  := $(shell pwd)
+
+all:
+	$(MAKE) -C $(KDIR) M=$(PWD) modules
+
+endif
+
+clean:
+	rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions *.mod
+	rm -rf modules.order Module.symvers

drivers/video/video_memory/driver/rsvmem_pool.c

@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2022 Alibaba Group. All rights reserved.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/mman.h>
+#include <linux/cdev.h>
+#include <linux/errno.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-buf.h>
+#include <linux/version.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/genalloc.h>
+#include "rsvmem_pool.h"
+
+/* 12 bits (4096 bytes) */
+#define GEN_POOL_ALLOC_ORDER 12
+
+static rsvmem_pool_info_t rsvmem_pool_regions[MAX_RSVMEM_REGION_COUNT];
+
+int rsvmem_pool_create(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *rsvmem_node;
+	struct resource res;
+	int pool_id = 0;
+	int ret;
+
+	if (!dev || !dev->of_node)
+		return -EINVAL;
+
+	rsvmem_node = of_parse_phandle(np, "memory-region", 0);
+	if (!rsvmem_node) {
+		dev_notice(dev, "No memory region node\n");
+		return -ENODEV;
+	}
+
+	while (pool_id < MAX_RSVMEM_REGION_COUNT &&
+	       of_address_to_resource(rsvmem_node, pool_id, &res) == 0) {
+		struct gen_pool *pool = gen_pool_create(GEN_POOL_ALLOC_ORDER, -1);
+		if (pool == NULL) {
+			dev_err(dev, "Failed to create reserved memory pool region[%d]\n", pool_id);
+			return -ENOMEM;
+		}
+
+		ret = gen_pool_add(pool, res.start, resource_size(&res), -1);
+		if (ret) {
+			dev_err(dev, "%s: gen_pool_add failed\n", __func__);
+			gen_pool_destroy(pool);
+			return ret;
+		}
+
+		rsvmem_pool_regions[pool_id].pool = pool;
+		rsvmem_pool_regions[pool_id].base = res.start;
+		rsvmem_pool_regions[pool_id].size = resource_size(&res);
+
+		dev_err(dev, "%s: rsvmem_pool_region[%d] = {pool=%px, base=0x%llx, size=0x%llx}\n",
+		        __func__, pool_id, rsvmem_pool_regions[pool_id].pool,
+		        rsvmem_pool_regions[pool_id].base, rsvmem_pool_regions[pool_id].size);
+
+		pool_id ++;
+	}
+
+	return 0;
+}
+
+void rsvmem_pool_destroy(void)
+{
+	int i;
+
+	for (i = 0; i < MAX_RSVMEM_REGION_COUNT; i++) {
+		if (rsvmem_pool_regions[i].pool != NULL) {
+			gen_pool_destroy(rsvmem_pool_regions[i].pool);
+			memset(&rsvmem_pool_regions[i], 0, sizeof(rsvmem_pool_info_t));
+		}
+	}
+}
+
+unsigned long rsvmem_pool_alloc(int region_id, size_t size)
+{
+	struct gen_pool *pool;
+	unsigned long addr;
+
+	if (region_id < 0 || region_id >= MAX_RSVMEM_REGION_COUNT) {
+		pr_err("%s: region_id(%d) is invalid\n", __func__, region_id);
+		return 0;
+	}
+
+	pool = rsvmem_pool_regions[region_id].pool;
+	if (pool == NULL) {
+		pr_err("%s: pool region[%d] is invalid\n", __func__, region_id);
+		return 0;
+	}
+
+	addr = gen_pool_alloc(pool, size);
+	pr_debug("%s: Allocated %zu bytes from pool region[%d]: 0x%08lx\n", __func__, size, region_id, addr);
+
+	return addr;
+}
+
+void rsvmem_pool_free(int region_id, size_t size, unsigned long addr)
+{
+	struct gen_pool *pool;
+
+	if (region_id < 0 || region_id >= MAX_RSVMEM_REGION_COUNT) {
+		pr_err("%s: region_id(%d) is invalid\n", __func__, region_id);
+		return;
+	}
+
+	pool = rsvmem_pool_regions[region_id].pool;
+	if (pool == NULL) {
+		pr_err("%s: rsvmem pool region[%d] is invalid\n", __func__, region_id);
+		return;
+	}
+
+	gen_pool_free(pool, addr, size);
+}
+

drivers/video/video_memory/driver/rsvmem_pool.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2022 Alibaba Group. All rights reserved.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __RSVMEM_POOL_H_
+#define __RSVMEM_POOL_H_
+
+#define MAX_RSVMEM_REGION_COUNT 16
+typedef struct rsvmem_pool_info
+{
+    struct gen_pool *pool;   // NULL means unavalible
+    resource_size_t base;
+    resource_size_t size;
+} rsvmem_pool_info_t;
+
+int rsvmem_pool_create(struct device *dev);
+void rsvmem_pool_destroy(void);
+unsigned long rsvmem_pool_alloc(int region_id, size_t size);
+void rsvmem_pool_free(int region_id, size_t size, unsigned long addr);
+
+#endif /* __RSVMEM_POOL_H_ */

drivers/video/video_memory/driver/video_memory.h

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2021 - 2022  Alibaba Group. All rights reserved.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __VIDEO_MEMORY_H_
+#define __VIDEO_MEMORY_H_
+
+
+#define IN
+#define OUT
+#define INOUT
+#define OPTIONAL
+
+/* No special needs. */
+#define ALLOC_FLAG_NONE                  0x00000000
+/* Physical contiguous. */
+#define ALLOC_FLAG_CONTIGUOUS            0x00000001
+/* Physical non contiguous. */
+#define ALLOC_FLAG_NON_CONTIGUOUS        0x00000002
+/* Need 32bit address. */
+#define ALLOC_FLAG_4GB_ADDR              0x00000004
+/* CMA priority */
+#define ALLOC_FLAG_CMA                   0x00000008
+/* Use VI reserved memory */
+#define ALLOC_FLAG_VI                    0x00000010
+
+/* Alloc rsvmem pool region id should be 0~15 */
+#define SET_ALLOC_FLAG_REGION(flag, region_id) (flag & 0x00ffffff) | (region_id << 24)
+#define GET_ALLOC_FLAG_REGION(flag)            (flag >> 24)
+
+#define MEMORY_IOC_MAGIC  'a'
+
+#define MEMORY_IOC_ALLOCATE         _IOWR(MEMORY_IOC_MAGIC, 1, VidmemParams *)
+#define MEMORY_IOC_FREE             _IOWR(MEMORY_IOC_MAGIC, 2, VidmemParams *)
+#define MEMORY_IOC_DMABUF_EXPORT    _IOWR(MEMORY_IOC_MAGIC, 3, VidmemParams *)
+#define MEMORY_IOC_DMABUF_IMPORT    _IOWR(MEMORY_IOC_MAGIC, 4, VidmemParams *)
+#define MEMORY_IOC_DMABUF_RELEASE   _IOWR(MEMORY_IOC_MAGIC, 5, VidmemParams *)
+#define MEMORY_IOC_MAXNR 5
+
+typedef struct {
+  unsigned long bus_address;
+  unsigned int size;
+  unsigned long translation_offset;
+  int fd;
+  int flags;
+} VidmemParams;
+
+#endif /* __VIDEO_MEMORY_H_ */

drivers/video/video_memory/lib/Makefile

@@ -0,0 +1,16 @@
+CFLAGS = -Wall -D_GNU_SOURCE -D_REENTRANT -D_THREAD_SAFE -O2 -Werror -Wno-unused -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function -Wno-strict-overflow -Wno-array-bounds -Wno-shift-negative-value -Wempty-body -Wtype-limits -Wno-unused-result -fPIC -Wmissing-field-initializers -std=gnu99
+
+INCLUDE += -I../driver
+
+SRCS = video_mem.c
+
+OUT_PATH = ../output/rootfs/bsp/vidmem/lib
+TARGET = $(OUT_PATH)/libvmem.so
+
+$(TARGET):
+	$(shell if [ ! -e $(OUT_PATH) ];then mkdir -p $(OUT_PATH); fi)
+	$(CC) $(SRCS) $(CFLAGS) $(INCLUDE) -shared -o $(TARGET)
+
+clean:
+	$(RM) -r $(OUT_PATH)
+

drivers/video/video_memory/lib/video_mem.c

@@ -0,0 +1,289 @@
+/*
+ * Copyright (c) 2021-2022 Alibaba Group. All rights reserved.
+ * License-Identifier: Apache-2.0
+ *
+ * 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 <sys/mman.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <memory.h>
+#include "video_memory.h"
+#include "video_mem.h"
+
+
+#define VMEM_PRINT(level, ...) \
+    { \
+        if (log_level >= VMEM_LOG_##level) \
+        { \
+            printf("VMEM[%d] %s: ", pid, #level); \
+            printf(__VA_ARGS__); \
+        } \
+    }
+
+#define VMEM_LOGE(...) VMEM_PRINT(ERROR, __VA_ARGS__)
+#define VMEM_LOGW(...) VMEM_PRINT(WARNING, __VA_ARGS__)
+#define VMEM_LOGI(...) VMEM_PRINT(INFO, __VA_ARGS__)
+#define VMEM_LOGD(...) VMEM_PRINT(DEBUG, __VA_ARGS__)
+#define VMEM_LOGT(...) VMEM_PRINT(TRACE, __VA_ARGS__)
+
+typedef enum _VmemLogLevel
+{
+    VMEM_LOG_QUIET = 0,
+    VMEM_LOG_ERROR,
+    VMEM_LOG_WARNING,
+    VMEM_LOG_INFO,
+    VMEM_LOG_DEBUG,
+    VMEM_LOG_TRACE,
+    VMEM_LOG_MAX
+} VmemLogLevel;
+
+typedef struct _VmemContext
+{
+    int fd_alloc;
+
+} VmemContext;
+
+int log_level = VMEM_LOG_ERROR;
+int pid = 0;
+
+static int getLogLevel();
+
+VmemStatus
+VMEM_create(void **vmem)
+{
+    VmemContext *ctx = NULL;
+
+    log_level = getLogLevel();
+    pid = getpid();
+
+    if (vmem == NULL)
+        return VMEM_STATUS_ERROR;
+
+    ctx = (VmemContext *)malloc(sizeof(*ctx));
+    if (ctx == NULL)
+        return VMEM_STATUS_NO_MEMORY;
+    *vmem = (void *)ctx;
+
+    ctx->fd_alloc = open("/dev/vidmem", O_RDWR);
+    if (ctx->fd_alloc == -1)
+    {
+        VMEM_LOGE("Failed to open /dev/vidmem\n");
+        return VMEM_STATUS_ERROR;
+    }
+
+    return VMEM_STATUS_OK;
+}
+
+VmemStatus
+VMEM_allocate(void *vmem, VmemParams *params)
+{
+    VmemContext *ctx = NULL;
+    VidmemParams p;
+
+    if (vmem == NULL || params == NULL)
+        return VMEM_STATUS_ERROR;
+
+    ctx = (VmemContext *)vmem;
+    params->phy_address = 0;
+    params->vir_address = NULL;
+    params->fd = -1;
+
+    memset(&p, 0, sizeof(p));
+    p.size = params->size;
+    p.flags = params->flags;
+    ioctl(ctx->fd_alloc, MEMORY_IOC_ALLOCATE, &p);
+    if (p.bus_address == 0)
+    {
+        VMEM_LOGE("Failed to allocate memory\n");
+        return VMEM_STATUS_NO_MEMORY;
+    }
+
+    params->phy_address = p.bus_address;
+    VMEM_LOGI("Allocated %d bytes, phy addr 0x%08x\n", 
+            params->size, params->phy_address);
+
+    return VMEM_STATUS_OK;
+}
+
+VmemStatus
+VMEM_mmap(void *vmem, VmemParams *params)
+{
+    VmemContext *ctx = NULL;
+    void *vir_addr;
+
+    if (vmem == NULL || params == NULL)
+        return VMEM_STATUS_ERROR;
+    
+    if (params->vir_address != NULL)
+        return VMEM_STATUS_OK;
+
+    ctx = (VmemContext *)vmem;
+    int fd = params->fd > 0 ? params->fd : ctx->fd_alloc;
+    unsigned int offset = params->fd > 0 ? 0 : params->phy_address;
+    vir_addr = mmap(0, params->size, PROT_READ | PROT_WRITE,
+                    MAP_SHARED, fd, offset);
+    if (vir_addr == MAP_FAILED)
+    {
+        VMEM_LOGE("Failed to mmap physical address: 0x%08x, using fd %d\n",
+                params->phy_address, fd);
+        return VMEM_STATUS_ERROR;
+    }
+
+    params->vir_address = vir_addr;
+    VMEM_LOGI("Mapped phy addr 0x%08x to vir addr %p, size %d\n", 
+            params->phy_address, params->vir_address, params->size);
+
+    return VMEM_STATUS_OK;
+}
+
+VmemStatus
+VMEM_free(void *vmem, VmemParams *params)
+{
+    VmemContext *ctx = NULL;
+    VidmemParams p;
+
+    if (vmem == NULL || params == NULL)
+        return VMEM_STATUS_ERROR;
+
+    ctx = (VmemContext *)vmem;
+
+    VMEM_LOGI("Free virt addr %p, phy addr 0x%08x, size %d\n", 
+            params->vir_address, params->phy_address, params->size);
+    if (params->vir_address != MAP_FAILED && params->vir_address != NULL)
+        munmap(params->vir_address, params->size);
+    params->vir_address = NULL;
+
+    if (params->phy_address != 0)
+    {
+        memset(&p, 0, sizeof(p));
+        p.bus_address = params->phy_address;
+        ioctl(ctx->fd_alloc, MEMORY_IOC_FREE, &p);
+        params->phy_address = 0;
+    }
+
+    return VMEM_STATUS_OK;
+}
+
+VmemStatus
+VMEM_destroy(void *vmem)
+{
+    if (vmem != NULL)
+    {
+        VmemContext *ctx = (VmemContext *)vmem;
+        if (ctx->fd_alloc != -1)
+            close(ctx->fd_alloc);
+        
+        free(vmem);
+    }
+
+    return VMEM_STATUS_OK;
+}
+
+VmemStatus
+VMEM_export(void *vmem, VmemParams *params)
+{
+    VmemContext *ctx = NULL;
+    VidmemParams p;
+
+    if (vmem == NULL || params == NULL)
+        return VMEM_STATUS_ERROR;
+    ctx = (VmemContext *)vmem;
+
+    memset(&p, 0, sizeof(p));
+    p.bus_address = params->phy_address;
+    p.flags = O_RDWR;
+    ioctl(ctx->fd_alloc, MEMORY_IOC_DMABUF_EXPORT, &p);
+    if (p.fd < 0) {
+        VMEM_LOGE("Failed to export memory\n");
+        return VMEM_STATUS_ERROR;
+    }
+
+    params->fd = p.fd;
+    VMEM_LOGI("Exported phy addr 0x%08x to fd %d, size %d\n", 
+            params->phy_address, params->fd, params->size);
+
+    return VMEM_STATUS_OK;
+}
+
+VmemStatus
+VMEM_import(void *vmem, VmemParams *params)
+{
+    VmemContext *ctx = NULL;
+    VidmemParams p;
+
+    if (vmem == NULL || params == NULL)
+        return VMEM_STATUS_ERROR;
+    ctx = (VmemContext *)vmem;
+
+    memset(&p, 0, sizeof(p));
+    p.fd = params->fd;
+    ioctl(ctx->fd_alloc, MEMORY_IOC_DMABUF_IMPORT, &p);
+    if (p.bus_address == 0 || p.size == 0) {
+        VMEM_LOGE("Failed to import memory\n");
+        return VMEM_STATUS_ERROR;
+    }
+
+    params->phy_address = p.bus_address;
+    params->size = p.size;
+    VMEM_LOGI("Imported fd %d to phy addr 0x%08x, size %d\n", 
+            params->fd, params->phy_address, params->size);
+
+    return VMEM_STATUS_OK;
+}
+
+VmemStatus
+VMEM_release(void *vmem, VmemParams *params)
+{
+    VmemContext *ctx = NULL;
+
+    if (vmem == NULL || params == NULL)
+        return VMEM_STATUS_ERROR;
+    ctx = (VmemContext *)vmem;
+
+    VMEM_LOGI("Released imported phy addr 0x%08x, fd %d, size %d\n", 
+            params->phy_address, params->fd, params->size);
+    if (params->vir_address != MAP_FAILED && params->vir_address != NULL)
+        munmap(params->vir_address, params->size);
+    params->vir_address = NULL;
+
+    if (params->phy_address != 0) {
+        VidmemParams p;
+        memset(&p, 0, sizeof(p));
+        p.bus_address = params->phy_address;
+        ioctl(ctx->fd_alloc, MEMORY_IOC_DMABUF_RELEASE, &p);
+        params->phy_address = 0;
+    }
+
+    return VMEM_STATUS_OK;
+}
+
+static int getLogLevel()
+{
+    char *env = getenv("VMEM_LOG_LEVEL");
+    if (env == NULL)
+        return VMEM_LOG_ERROR;
+    else
+    {
+        int level = atoi(env);
+        if (level >= VMEM_LOG_MAX || level < VMEM_LOG_QUIET)
+            return VMEM_LOG_ERROR;
+        else
+            return level;
+    }
+}

drivers/video/video_memory/lib/video_mem.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2021-2022 Alibaba Group. All rights reserved.
+ * License-Identifier: Apache-2.0
+ *
+ * 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.
+ *
+ */
+#ifndef _VIDEO_MEM_H_
+#define _VIDEO_MEM_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* No special needs. */
+#define VMEM_FLAG_NONE                  0x00000000
+/* Physical contiguous. */
+#define VMEM_FLAG_CONTIGUOUS            0x00000001
+/* Physical non contiguous. */
+#define VMEM_FLAG_NON_CONTIGUOUS        0x00000002
+/* Need 32bit address. */
+#define VMEM_FLAG_4GB_ADDR              0x00000004
+/* CMA priority */
+#define VMEM_FLAG_CMA                   0x00000008
+/* Use VI reserved memory */
+#define VMEM_FLAG_VI                    0x00000010
+
+/* Alloc rsvmem pool region id should be 0~15 */
+#define SET_ALLOC_FLAG_REGION(flag, region_id) (flag & 0x00ffffff) | (region_id << 24)
+#define GET_ALLOC_FLAG_REGION(flag)            (flag >> 24)
+
+typedef enum _VmemStatus
+{
+    VMEM_STATUS_OK = 0,
+    VMEM_STATUS_ERROR = -1,     /* general error */
+    VMEM_STATUS_NO_MEMORY = -2, /* not enough memory to allocate buffer */
+} VmemStatus;
+
+typedef struct _VmemParams
+{
+    int size;
+    int flags;
+    unsigned int phy_address;
+    void *vir_address;
+    int fd;
+} VmemParams;
+
+VmemStatus VMEM_create(void **vmem);
+VmemStatus VMEM_allocate(void *vmem, VmemParams *params);
+VmemStatus VMEM_mmap(void *vmem, VmemParams *params);
+VmemStatus VMEM_free(void *vmem, VmemParams *params);
+VmemStatus VMEM_destroy(void *vmem);
+
+VmemStatus VMEM_export(void *vmem, VmemParams *params);
+VmemStatus VMEM_import(void *vmem, VmemParams *params);
+VmemStatus VMEM_release(void *vmem, VmemParams *params);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_VIDEO_MEM_H_ */

drivers/video/video_memory/test/Makefile

@@ -0,0 +1,70 @@
+CFLAGS = -Wall -D_GNU_SOURCE -D_REENTRANT -D_THREAD_SAFE -O2 -Werror -Wno-unused -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function -Wno-strict-overflow -Wno-array-bounds -Wno-shift-negative-value -Wempty-body -Wtype-limits -Wno-unused-result -fPIC -Wmissing-field-initializers -std=gnu99
+
+INCLUDE += -I../lib
+
+SRCS = video_memory_test.c
+OBJS = $(SRCS:.c=.o)
+
+#source search path
+vpath %.c
+
+# name of the outputfile (library)
+TARGET = vidmem_test
+
+#Here are rules for building codes and generating object library.
+all:    tags
+	@echo ---------------------------------------
+	@echo "Usage: make [ system | testdata | versatile | integrator | android]"
+	@echo "system     - PC system model (== pclinux)"
+	@echo "testdata   - PC system model for test data creation"
+	@echo "eval       - PC system model for evaluation with frame limit"
+	@echo "versatile  - ARM versatile with FPGA HW"
+	@echo "integrator - ARM integrator with FPGA HW"
+	@echo "android    - ARM android"
+	@echo "NOTE! Make sure to do 'make clean'"
+	@echo "between compiling to different targets!"
+	@echo ---------------------------------------
+
+.PHONY: system_lib system testdata clean depend
+
+evaluation: eval
+eval: system
+
+system_static: testdata
+system: testdata
+
+# for libva
+system_lib: system
+
+testdata: .depend
+
+
+.PHONY: hwlinux
+hwlinux:
+hwlinux: .depend $(TARGET)
+
+$(TARGET): $(OBJS)
+	$(CC) $(CFLAGS) $(OBJS) -L../output/rootfs/bsp/vidmem/lib -lvmem -lm -lpthread -o $(TARGET)
+
+
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $(INCLUDE) $< -o $@
+
+clean:
+	$(RM) $(TARGET)
+	$(RM) .depend
+	$(RM) *.o *.gcno *.gcda
+
+tags:
+	ctags ../kernel_mode/*h ./*[ch]
+
+depend .depend: $(SRCS)
+	@echo "[CC] $@"
+	@$(CC) -M $(DEBFLAGS) $(INCLUDE) $^ > .depend
+
+ifneq (clean, $(findstring clean, $(MAKECMDGOALS)))
+ifeq (.depend, $(wildcard .depend))
+include .depend
+endif
+endif

drivers/video/video_memory/test/video_memory_test.c

@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 2021-2022 Alibaba Group. All rights reserved.
+ * License-Identifier: Apache-2.0
+ *
+ * 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 <sys/mman.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <memory.h>
+#include "video_mem.h"
+
+typedef enum MemType
+{
+    MEM_TYPE_CONTIGUOUS,
+    MEM_TYPE_NONCONTIGUOUS,
+    MEM_TYPE_CMA,
+    MEM_TYPE_VI,
+    MEM_TYPE_MAX
+} MemType;
+
+int alloc_flags[MEM_TYPE_MAX] =
+{
+    VMEM_FLAG_CONTIGUOUS | VMEM_FLAG_4GB_ADDR,
+    VMEM_FLAG_NON_CONTIGUOUS,
+    VMEM_FLAG_CMA,
+    VMEM_FLAG_VI
+};
+
+int alloc_num[MEM_TYPE_MAX] = {3, 3, 3, 3};
+
+void printUsage(char *name)
+{
+    printf(" \
+        Usage: %s [buf_size|-h]\n\
+            buf_size:   buffer size to be allocated, in unit of 4K pages\n\
+            -h:         print this message\n",
+            name);
+}
+
+int main(int argc, char **argv)
+{
+    int fd_alloc = -1;
+    int size = 1920*1080*3/2;
+    int pgsize = getpagesize();
+    void *vmem = NULL;
+    VmemParams *vmparams[MEM_TYPE_MAX] = {0};
+    int err = 0;
+
+    if (argc > 1)
+    {
+        if (strcmp(argv[1], "-h") == 0)
+        {
+            printUsage(argv[0]);
+            return 0;
+        }
+        else
+            size = atoi(argv[1]) * pgsize;
+    }
+
+    if (size <= 0)
+    {
+        printf("ERROR: invalid size: %d\n", size);
+        printUsage(argv[0]);
+        return -1;
+    }
+
+    do
+    {
+        if (VMEM_create(&vmem) != VMEM_STATUS_OK)
+            break;
+
+        VmemParams imp_params;
+        for (int type = 0; type < MEM_TYPE_MAX; type++)
+        {
+            vmparams[type] = malloc(sizeof(VmemParams)*alloc_num[type]);
+            if (vmparams[type] == NULL)
+            {
+                printf("ERROR: Failed to allocate VmemParams\n");
+                err = 1;
+                break;
+            }
+
+            for (int i = 0; i < alloc_num[type]; i++)
+            {
+                VmemParams *params = &vmparams[type][i];
+                memset(params, 0, sizeof(*params));
+                params->size = size;
+                params->flags = alloc_flags[type];
+
+                int vi_rsvmem_pool_region_id = i;   // only for type == MEM_TYPE_VI
+                if (type == MEM_TYPE_VI)
+                {
+                    params->flags = SET_ALLOC_FLAG_REGION(params->flags, vi_rsvmem_pool_region_id);
+                }
+
+                if (VMEM_allocate(vmem, params) != VMEM_STATUS_OK)
+                {
+                    if (type == MEM_TYPE_VI)
+                        printf("ERROR: Failed to allocate memory type %d, region_id=%d\n",
+                               type, vi_rsvmem_pool_region_id);
+                    else
+                        printf("ERROR: Failed to allocate memory type %d\n", type);
+                    break;
+                }
+                if (VMEM_mmap(vmem, params) != VMEM_STATUS_OK)
+                {
+                    printf("ERROR: Failed to mmap busAddress: 0x%08x\n",
+                            params->phy_address);
+                    err = 1;
+                    break;
+                }
+                if (VMEM_export(vmem, params) != VMEM_STATUS_OK)
+                {
+                    printf("ERROR: Failed to export buffer: 0x%08x\n",
+                            params->phy_address);
+                    err = 1;
+                    break;
+                }
+
+                printf("Allocated buffer %d of type %d at paddr 0x%08x vaddr %p size %d fd %d\n",
+                    i, type, params->phy_address, params->vir_address, size, params->fd);
+
+                memset(&imp_params, 0, sizeof(imp_params));
+                imp_params.fd = params->fd;
+                if (VMEM_import(vmem, &imp_params) != VMEM_STATUS_OK)
+                {
+                    printf("ERROR: Failed to import fd %d\n", params->fd);
+                    err = 1;
+                    break;
+                }
+
+                printf("Imported fd %d: paddr 0x%08x vaddr %p size %d\n",
+                    params->fd, params->phy_address, params->vir_address, size);
+                VMEM_release(vmem, &imp_params);
+            }
+
+            if (err)
+                break;
+        }
+    } while (0);
+
+    for (int type = 0; type < MEM_TYPE_MAX; type++)
+    {
+        for (int i = 0; i < alloc_num[type]; i++)
+        {
+            VmemParams *params = &vmparams[type][i];
+            VMEM_free(vmem, params);
+            memset(params, 0, sizeof(*params));
+        }
+
+        if (vmparams[type])
+            free(vmparams[type]);
+    }
+
+    VMEM_destroy(vmem);
+
+    return 0;
+}
+