staging/atomisp: Add support for the Intel IPU v2

This patch adds support for the Intel IPU v2 as found on Android and IoT
Baytrail-T and Baytrail-CR platforms (those with the IPU PCI mapped). You
will also need the firmware files from your device (Android usually puts
them into /etc) - or you can find them in the downloadable restore/upgrade
kits if you blew them away for some reason.

It may be possible to extend the driver to handle the BYT/T windows
platforms such as the ASUS T100TA. These platforms don't expose the IPU via
the PCI interface but via ACPI buried in the GPU description and with the
camera information somewhere unknown so would need a platform driver
interface adding to the codebase *IFF* the firmware works on such devices.

To get good results you also need a suitable support library such as
libxcam. The camera is intended to be driven from Android so it has a lot of
features that many desktop apps don't fully spport.

In theory all the pieces are there to build it with -DISP2401 and some
differing files to get CherryTrail/T support, but unifying the drivers
properlly is a work in progress.

The IPU driver represents the work of a lot of people within Intel over many
years. It's historical goal was portability rather than Linux upstream. Any
queries about the upstream aimed driver should be sent to me not to the
original authors.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 769 insertions, 0 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm.c b/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm.c
new file mode 100644
index 000000000000..358d340e7434
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm.c
@@ -0,0 +1,769 @@
+/*
+ * Support for Medifield PNW Camera Imaging ISP subsystem.
+ *
+ * Copyright (c) 2010 Intel Corporation. All Rights Reserved.
+ *
+ * Copyright (c) 2010 Silicon Hive www.siliconhive.com.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ */
+/*
+ * This file contains entry functions for memory management of ISP driver
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>	/* for kmap */
+#include <linux/io.h>		/* for page_to_phys */
+#include <linux/sysfs.h>
+
+#include "hmm/hmm.h"
+#include "hmm/hmm_pool.h"
+#include "hmm/hmm_bo.h"
+
+#include "atomisp_internal.h"
+#include "asm/cacheflush.h"
+#include "mmu/isp_mmu.h"
+#include "mmu/sh_mmu_mrfld.h"
+
+#ifdef USE_SSSE3
+#include <asm/ssse3.h>
+#endif
+
+struct hmm_bo_device bo_device;
+struct hmm_pool	dynamic_pool;
+struct hmm_pool	reserved_pool;
+static ia_css_ptr dummy_ptr;
+struct _hmm_mem_stat hmm_mem_stat;
+
+const char *hmm_bo_type_strings[HMM_BO_LAST] = {
+	"p", /* private */
+	"s", /* shared */
+	"u", /* user */
+#ifdef CONFIG_ION
+	"i", /* ion */
+#endif
+};
+
+static ssize_t bo_show(struct device *dev, struct device_attribute *attr,
+			char *buf, struct list_head *bo_list, bool active)
+{
+	ssize_t ret = 0;
+	struct hmm_buffer_object *bo;
+	unsigned long flags;
+	int i;
+	long total[HMM_BO_LAST] = { 0 };
+	long count[HMM_BO_LAST] = { 0 };
+	int index1 = 0;
+	int index2 = 0;
+
+	ret = scnprintf(buf, PAGE_SIZE, "type pgnr\n");
+	if (ret <= 0)
+		return 0;
+
+	index1 += ret;
+
+	spin_lock_irqsave(&bo_device.list_lock, flags);
+	list_for_each_entry(bo, bo_list, list) {
+		if ((active && (bo->status & HMM_BO_ALLOCED)) ||
+			(!active && !(bo->status & HMM_BO_ALLOCED))) {
+			ret = scnprintf(buf + index1, PAGE_SIZE - index1,
+				"%s %d\n",
+				hmm_bo_type_strings[bo->type], bo->pgnr);
+
+			total[bo->type] += bo->pgnr;
+			count[bo->type]++;
+			if (ret > 0)
+				index1 += ret;
+		}
+	}
+	spin_unlock_irqrestore(&bo_device.list_lock, flags);
+
+	for (i = 0; i < HMM_BO_LAST; i++) {
+		if (count[i]) {
+			ret = scnprintf(buf + index1 + index2,
+				PAGE_SIZE - index1 - index2,
+				"%ld %s buffer objects: %ld KB\n",
+				count[i], hmm_bo_type_strings[i], total[i] * 4);
+			if (ret > 0)
+				index2 += ret;
+		}
+	}
+
+	/* Add trailing zero, not included by scnprintf */
+	return index1 + index2 + 1;
+}
+
+static ssize_t active_bo_show(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	return bo_show(dev, attr, buf, &bo_device.entire_bo_list, true);
+}
+
+static ssize_t free_bo_show(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	return bo_show(dev, attr, buf, &bo_device.entire_bo_list, false);
+}
+
+static ssize_t reserved_pool_show(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	ssize_t ret = 0;
+
+	struct hmm_reserved_pool_info *pinfo = reserved_pool.pool_info;
+	unsigned long flags;
+
+	if (!pinfo || !pinfo->initialized)
+		return 0;
+
+	spin_lock_irqsave(&pinfo->list_lock, flags);
+	ret = scnprintf(buf, PAGE_SIZE, "%d out of %d pages available\n",
+					pinfo->index, pinfo->pgnr);
+	spin_unlock_irqrestore(&pinfo->list_lock, flags);
+
+	if (ret > 0)
+		ret++; /* Add trailing zero, not included by scnprintf */
+
+	return ret;
+};
+
+static ssize_t dynamic_pool_show(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	ssize_t ret = 0;
+
+	struct hmm_dynamic_pool_info *pinfo = dynamic_pool.pool_info;
+	unsigned long flags;
+
+	if (!pinfo || !pinfo->initialized)
+		return 0;
+
+	spin_lock_irqsave(&pinfo->list_lock, flags);
+	ret = scnprintf(buf, PAGE_SIZE, "%d (max %d) pages available\n",
+					pinfo->pgnr, pinfo->pool_size);
+	spin_unlock_irqrestore(&pinfo->list_lock, flags);
+
+	if (ret > 0)
+		ret++; /* Add trailing zero, not included by scnprintf */
+
+	return ret;
+};
+
+static DEVICE_ATTR(active_bo, S_IRUGO, active_bo_show, NULL);
+static DEVICE_ATTR(free_bo, S_IRUGO, free_bo_show, NULL);
+static DEVICE_ATTR(reserved_pool, S_IRUGO, reserved_pool_show, NULL);
+static DEVICE_ATTR(dynamic_pool, S_IRUGO, dynamic_pool_show, NULL);
+
+static struct attribute *sysfs_attrs_ctrl[] = {
+	&dev_attr_active_bo.attr,
+	&dev_attr_free_bo.attr,
+	&dev_attr_reserved_pool.attr,
+	&dev_attr_dynamic_pool.attr,
+	NULL
+};
+
+static struct attribute_group atomisp_attribute_group[] = {
+	{.attrs = sysfs_attrs_ctrl },
+};
+
+int hmm_init(void)
+{
+	int ret;
+
+	ret = hmm_bo_device_init(&bo_device, &sh_mmu_mrfld,
+				 ISP_VM_START, ISP_VM_SIZE);
+	if (ret)
+		dev_err(atomisp_dev, "hmm_bo_device_init failed.\n");
+
+	/*
+	 * As hmm use NULL to indicate invalid ISP virtual address,
+	 * and ISP_VM_START is defined to 0 too, so we allocate
+	 * one piece of dummy memory, which should return value 0,
+	 * at the beginning, to avoid hmm_alloc return 0 in the
+	 * further allocation.
+	 */
+	dummy_ptr = hmm_alloc(1, HMM_BO_PRIVATE, 0, 0, HMM_UNCACHED);
+
+	if (!ret) {
+		ret = sysfs_create_group(&atomisp_dev->kobj,
+				atomisp_attribute_group);
+		if (ret)
+			dev_err(atomisp_dev,
+				"%s Failed to create sysfs\n", __func__);
+	}
+
+	return ret;
+}
+
+void hmm_cleanup(void)
+{
+	sysfs_remove_group(&atomisp_dev->kobj, atomisp_attribute_group);
+
+	/*
+	 * free dummy memory first
+	 */
+	hmm_free(dummy_ptr);
+	dummy_ptr = 0;
+
+	hmm_bo_device_exit(&bo_device);
+}
+
+ia_css_ptr hmm_alloc(size_t bytes, enum hmm_bo_type type,
+		int from_highmem, void *userptr, bool cached)
+{
+	unsigned int pgnr;
+	struct hmm_buffer_object *bo;
+	int ret;
+
+	/*Get page number from size*/
+	pgnr = size_to_pgnr_ceil(bytes);
+
+	/*Buffer object structure init*/
+	bo = hmm_bo_alloc(&bo_device, pgnr);
+	if (!bo) {
+		dev_err(atomisp_dev, "hmm_bo_create failed.\n");
+		goto create_bo_err;
+	}
+
+	/*Allocate pages for memory*/
+	ret = hmm_bo_alloc_pages(bo, type, from_highmem, userptr, cached);
+	if (ret) {
+		dev_err(atomisp_dev,
+			    "hmm_bo_alloc_pages failed.\n");
+		goto alloc_page_err;
+	}
+
+	/*Combind the virtual address and pages togather*/
+	ret = hmm_bo_bind(bo);
+	if (ret) {
+		dev_err(atomisp_dev, "hmm_bo_bind failed.\n");
+		goto bind_err;
+	}
+
+	hmm_mem_stat.tol_cnt += pgnr;
+
+	return bo->start;
+
+bind_err:
+	hmm_bo_free_pages(bo);
+alloc_page_err:
+	hmm_bo_unref(bo);
+create_bo_err:
+	return 0;
+}
+
+void hmm_free(ia_css_ptr virt)
+{
+	struct hmm_buffer_object *bo;
+
+	bo = hmm_bo_device_search_start(&bo_device, (unsigned int)virt);
+
+	if (!bo) {
+		dev_err(atomisp_dev,
+			    "can not find buffer object start with "
+			    "address 0x%x\n", (unsigned int)virt);
+		return;
+	}
+
+	hmm_mem_stat.tol_cnt -= bo->pgnr;
+
+	hmm_bo_unbind(bo);
+
+	hmm_bo_free_pages(bo);
+
+	hmm_bo_unref(bo);
+}
+
+static inline int hmm_check_bo(struct hmm_buffer_object *bo, unsigned int ptr)
+{
+	if (!bo) {
+		dev_err(atomisp_dev,
+			    "can not find buffer object contains "
+			    "address 0x%x\n", ptr);
+		return -EINVAL;
+	}
+
+	if (!hmm_bo_page_allocated(bo)) {
+		dev_err(atomisp_dev,
+			    "buffer object has no page allocated.\n");
+		return -EINVAL;
+	}
+
+	if (!hmm_bo_allocated(bo)) {
+		dev_err(atomisp_dev,
+			    "buffer object has no virtual address"
+			    " space allocated.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*Read function in ISP memory management*/
+static int load_and_flush_by_kmap(ia_css_ptr virt, void *data, unsigned int bytes)
+{
+	struct hmm_buffer_object *bo;
+	unsigned int idx, offset, len;
+	char *src, *des;
+	int ret;
+
+	bo = hmm_bo_device_search_in_range(&bo_device, virt);
+	ret = hmm_check_bo(bo, virt);
+	if (ret)
+		return ret;
+
+	des = (char *)data;
+	while (bytes) {
+		idx = (virt - bo->start) >> PAGE_SHIFT;
+		offset = (virt - bo->start) - (idx << PAGE_SHIFT);
+
+		src = (char *)kmap(bo->page_obj[idx].page);
+		if (!src) {
+			dev_err(atomisp_dev,
+				    "kmap buffer object page failed: "
+				    "pg_idx = %d\n", idx);
+			return -EINVAL;
+		}
+
+		src += offset;
+
+		if ((bytes + offset) >= PAGE_SIZE) {
+			len = PAGE_SIZE - offset;
+			bytes -= len;
+		} else {
+			len = bytes;
+			bytes = 0;
+		}
+
+		virt += len;	/* update virt for next loop */
+
+		if (des) {
+
+#ifdef USE_SSSE3
+			_ssse3_memcpy(des, src, len);
+#else
+			memcpy(des, src, len);
+#endif
+			des += len;
+		}
+
+		clflush_cache_range(src, len);
+
+		kunmap(bo->page_obj[idx].page);
+	}
+
+	return 0;
+}
+
+/*Read function in ISP memory management*/
+static int load_and_flush(ia_css_ptr virt, void *data, unsigned int bytes)
+{
+	struct hmm_buffer_object *bo;
+	int ret;
+
+	bo = hmm_bo_device_search_in_range(&bo_device, virt);
+	ret = hmm_check_bo(bo, virt);
+	if (ret)
+		return ret;
+
+	if (bo->status & HMM_BO_VMAPED || bo->status & HMM_BO_VMAPED_CACHED) {
+		void *src = bo->vmap_addr;
+
+		src += (virt - bo->start);
+#ifdef USE_SSSE3
+		_ssse3_memcpy(data, src, bytes);
+#else
+		memcpy(data, src, bytes);
+#endif
+		if (bo->status & HMM_BO_VMAPED_CACHED)
+			clflush_cache_range(src, bytes);
+	} else {
+		void *vptr;
+
+		vptr = hmm_bo_vmap(bo, true);
+		if (!vptr)
+			return load_and_flush_by_kmap(virt, data, bytes);
+		else
+			vptr = vptr + (virt - bo->start);
+
+#ifdef USE_SSSE3
+		_ssse3_memcpy(data, vptr, bytes);
+#else
+		memcpy(data, vptr, bytes);
+#endif
+		clflush_cache_range(vptr, bytes);
+		hmm_bo_vunmap(bo);
+	}
+
+	return 0;
+}
+
+/*Read function in ISP memory management*/
+int hmm_load(ia_css_ptr virt, void *data, unsigned int bytes)
+{
+	if (!data) {
+		dev_err(atomisp_dev,
+			 "hmm_load NULL argument\n");
+		return -EINVAL;
+	}
+	return load_and_flush(virt, data, bytes);
+}
+
+/*Flush hmm data from the data cache*/
+int hmm_flush(ia_css_ptr virt, unsigned int bytes)
+{
+	return load_and_flush(virt, NULL, bytes);
+}
+
+/*Write function in ISP memory management*/
+int hmm_store(ia_css_ptr virt, const void *data, unsigned int bytes)
+{
+	struct hmm_buffer_object *bo;
+	unsigned int idx, offset, len;
+	char *src, *des;
+	int ret;
+
+	bo = hmm_bo_device_search_in_range(&bo_device, virt);
+	ret = hmm_check_bo(bo, virt);
+	if (ret)
+		return ret;
+
+	if (bo->status & HMM_BO_VMAPED || bo->status & HMM_BO_VMAPED_CACHED) {
+		void *dst = bo->vmap_addr;
+
+		dst += (virt - bo->start);
+#ifdef USE_SSSE3
+		_ssse3_memcpy(dst, data, bytes);
+#else
+		memcpy(dst, data, bytes);
+#endif
+		if (bo->status & HMM_BO_VMAPED_CACHED)
+			clflush_cache_range(dst, bytes);
+	} else {
+		void *vptr;
+
+		vptr = hmm_bo_vmap(bo, true);
+		if (vptr) {
+			vptr = vptr + (virt - bo->start);
+
+#ifdef USE_SSSE3
+			_ssse3_memcpy(vptr, data, bytes);
+#else
+			memcpy(vptr, data, bytes);
+#endif
+			clflush_cache_range(vptr, bytes);
+			hmm_bo_vunmap(bo);
+			return 0;
+		}
+	}
+
+	src = (char *)data;
+	while (bytes) {
+		idx = (virt - bo->start) >> PAGE_SHIFT;
+		offset = (virt - bo->start) - (idx << PAGE_SHIFT);
+
+		if (in_atomic())
+			des = (char *)kmap_atomic(bo->page_obj[idx].page);
+		else
+			des = (char *)kmap(bo->page_obj[idx].page);
+
+		if (!des) {
+			dev_err(atomisp_dev,
+				    "kmap buffer object page failed: "
+				    "pg_idx = %d\n", idx);
+			return -EINVAL;
+		}
+
+		des += offset;
+
+		if ((bytes + offset) >= PAGE_SIZE) {
+			len = PAGE_SIZE - offset;
+			bytes -= len;
+		} else {
+			len = bytes;
+			bytes = 0;
+		}
+
+		virt += len;
+
+#ifdef USE_SSSE3
+		_ssse3_memcpy(des, src, len);
+#else
+		memcpy(des, src, len);
+#endif
+		src += len;
+
+		clflush_cache_range(des, len);
+
+		if (in_atomic())
+			/*
+			 * Note: kunmap_atomic requires return addr from
+			 * kmap_atomic, not the page. See linux/highmem.h
+			 */
+			kunmap_atomic(des - offset);
+		else
+			kunmap(bo->page_obj[idx].page);
+	}
+
+	return 0;
+}
+
+/*memset function in ISP memory management*/
+int hmm_set(ia_css_ptr virt, int c, unsigned int bytes)
+{
+	struct hmm_buffer_object *bo;
+	unsigned int idx, offset, len;
+	char *des;
+	int ret;
+
+	bo = hmm_bo_device_search_in_range(&bo_device, virt);
+	ret = hmm_check_bo(bo, virt);
+	if (ret)
+		return ret;
+
+	if (bo->status & HMM_BO_VMAPED || bo->status & HMM_BO_VMAPED_CACHED) {
+		void *dst = bo->vmap_addr;
+
+		dst += (virt - bo->start);
+		memset(dst, c, bytes);
+
+		if (bo->status & HMM_BO_VMAPED_CACHED)
+			clflush_cache_range(dst, bytes);
+	} else {
+		void *vptr;
+
+		vptr = hmm_bo_vmap(bo, true);
+		if (vptr) {
+			vptr = vptr + (virt - bo->start);
+			memset((void *)vptr, c, bytes);
+			clflush_cache_range(vptr, bytes);
+			hmm_bo_vunmap(bo);
+			return 0;
+		}
+	}
+
+	while (bytes) {
+		idx = (virt - bo->start) >> PAGE_SHIFT;
+		offset = (virt - bo->start) - (idx << PAGE_SHIFT);
+
+		des = (char *)kmap(bo->page_obj[idx].page);
+		if (!des) {
+			dev_err(atomisp_dev,
+				    "kmap buffer object page failed: "
+				    "pg_idx = %d\n", idx);
+			return -EINVAL;
+		}
+		des += offset;
+
+		if ((bytes + offset) >= PAGE_SIZE) {
+			len = PAGE_SIZE - offset;
+			bytes -= len;
+		} else {
+			len = bytes;
+			bytes = 0;
+		}
+
+		virt += len;
+
+		memset(des, c, len);
+
+		clflush_cache_range(des, len);
+
+		kunmap(bo->page_obj[idx].page);
+	}
+
+	return 0;
+}
+
+/*Virtual address to physical address convert*/
+phys_addr_t hmm_virt_to_phys(ia_css_ptr virt)
+{
+	unsigned int idx, offset;
+	struct hmm_buffer_object *bo;
+
+	bo = hmm_bo_device_search_in_range(&bo_device, virt);
+	if (!bo) {
+		dev_err(atomisp_dev,
+			"can not find buffer object contains address 0x%x\n",
+			virt);
+		return -1;
+	}
+
+	idx = (virt - bo->start) >> PAGE_SHIFT;
+	offset = (virt - bo->start) - (idx << PAGE_SHIFT);
+
+	return page_to_phys(bo->page_obj[idx].page) + offset;
+}
+
+int hmm_mmap(struct vm_area_struct *vma, ia_css_ptr virt)
+{
+	struct hmm_buffer_object *bo;
+
+	bo = hmm_bo_device_search_start(&bo_device, virt);
+	if (!bo) {
+		dev_err(atomisp_dev,
+			"can not find buffer object start with address 0x%x\n",
+			virt);
+		return -EINVAL;
+	}
+
+	return hmm_bo_mmap(vma, bo);
+}
+
+/*Map ISP virtual address into IA virtual address*/
+void *hmm_vmap(ia_css_ptr virt, bool cached)
+{
+	struct hmm_buffer_object *bo;
+	void *ptr;
+
+	bo = hmm_bo_device_search_in_range(&bo_device, virt);
+	if (!bo) {
+		dev_err(atomisp_dev,
+			    "can not find buffer object contains address 0x%x\n",
+			    virt);
+		return NULL;
+	}
+
+	ptr = hmm_bo_vmap(bo, cached);
+	if (ptr)
+		return ptr + (virt - bo->start);
+	else
+		return NULL;
+}
+
+/* Flush the memory which is mapped as cached memory through hmm_vmap */
+void hmm_flush_vmap(ia_css_ptr virt)
+{
+	struct hmm_buffer_object *bo;
+
+	bo = hmm_bo_device_search_in_range(&bo_device, virt);
+	if (!bo) {
+		dev_warn(atomisp_dev,
+			    "can not find buffer object contains address 0x%x\n",
+			    virt);
+		return;
+	}
+
+	hmm_bo_flush_vmap(bo);
+}
+
+void hmm_vunmap(ia_css_ptr virt)
+{
+	struct hmm_buffer_object *bo;
+
+	bo = hmm_bo_device_search_in_range(&bo_device, virt);
+	if (!bo) {
+		dev_warn(atomisp_dev,
+			"can not find buffer object contains address 0x%x\n",
+			virt);
+		return;
+	}
+
+	return hmm_bo_vunmap(bo);
+}
+
+int hmm_pool_register(unsigned int pool_size,
+			enum hmm_pool_type pool_type)
+{
+	switch (pool_type) {
+	case HMM_POOL_TYPE_RESERVED:
+		reserved_pool.pops = &reserved_pops;
+		return reserved_pool.pops->pool_init(&reserved_pool.pool_info,
+							pool_size);
+	case HMM_POOL_TYPE_DYNAMIC:
+		dynamic_pool.pops = &dynamic_pops;
+		return dynamic_pool.pops->pool_init(&dynamic_pool.pool_info,
+							pool_size);
+	default:
+		dev_err(atomisp_dev, "invalid pool type.\n");
+		return -EINVAL;
+	}
+}
+
+void hmm_pool_unregister(enum hmm_pool_type pool_type)
+{
+	switch (pool_type) {
+	case HMM_POOL_TYPE_RESERVED:
+		if (reserved_pool.pops && reserved_pool.pops->pool_exit)
+			reserved_pool.pops->pool_exit(&reserved_pool.pool_info);
+		break;
+	case HMM_POOL_TYPE_DYNAMIC:
+		if (dynamic_pool.pops && dynamic_pool.pops->pool_exit)
+			dynamic_pool.pops->pool_exit(&dynamic_pool.pool_info);
+		break;
+	default:
+		dev_err(atomisp_dev, "invalid pool type.\n");
+		break;
+	}
+
+	return;
+}
+
+void *hmm_isp_vaddr_to_host_vaddr(ia_css_ptr ptr, bool cached)
+{
+	return hmm_vmap(ptr, cached);
+	/* vmunmap will be done in hmm_bo_release() */
+}
+
+ia_css_ptr hmm_host_vaddr_to_hrt_vaddr(const void *ptr)
+{
+	struct hmm_buffer_object *bo;
+
+	bo = hmm_bo_device_search_vmap_start(&bo_device, ptr);
+	if (bo)
+		return bo->start;
+
+	dev_err(atomisp_dev,
+		"can not find buffer object whose kernel virtual address is %p\n",
+		ptr);
+	return 0;
+}
+
+void hmm_show_mem_stat(const char *func, const int line)
+{
+	trace_printk("tol_cnt=%d usr_size=%d res_size=%d res_cnt=%d sys_size=%d  dyc_thr=%d dyc_size=%d.\n",
+			hmm_mem_stat.tol_cnt,
+			hmm_mem_stat.usr_size, hmm_mem_stat.res_size,
+			hmm_mem_stat.res_cnt, hmm_mem_stat.sys_size,
+			hmm_mem_stat.dyc_thr, hmm_mem_stat.dyc_size);
+}
+
+void hmm_init_mem_stat(int res_pgnr, int dyc_en, int dyc_pgnr)
+{
+	hmm_mem_stat.res_size = res_pgnr;
+	/* If reserved mem pool is not enabled, set its "mem stat" values as -1. */
+	if (0 == hmm_mem_stat.res_size) {
+		hmm_mem_stat.res_size = -1;
+		hmm_mem_stat.res_cnt = -1;
+	}
+
+	/* If dynamic memory pool is not enabled, set its "mem stat" values as -1. */
+	if (!dyc_en) {
+		hmm_mem_stat.dyc_size = -1;
+		hmm_mem_stat.dyc_thr = -1;
+	} else {
+		hmm_mem_stat.dyc_size = 0;
+		hmm_mem_stat.dyc_thr = dyc_pgnr;
+	}
+	hmm_mem_stat.usr_size = 0;
+	hmm_mem_stat.sys_size = 0;
+	hmm_mem_stat.tol_cnt = 0;
+}