drivers/amlogic/media/common/v4l_util/videobuf-res.c - manifest_repos/kernel - Git at Google

 /*
  * drivers/amlogic/media/common/v4l_util/videobuf-res.c
  *
  * Copyright (C) 2017 Amlogic, Inc. 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.
  *
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/amlogic/media/v4l_util/videobuf-res.h>
 #include <linux/io.h>
 #include <linux/printk.h>

 struct videobuf_res_memory {
 	u32 magic;
 	void *vaddr;
 	resource_size_t phy_addr;
 	unsigned long size;
 };

 static int debug;
 module_param(debug, int, 0644);

 #define pr_dbg(fmt, args...) pr_info("videobuf-res: " fmt, ## args)

 #define MAGIC_RE_MEM 0x123039dc
 #define MAGIC_CHECK(is, should) {					\
 		if (unlikely((is) != (should)))	{			\
 			pr_err("magic mismatch: %x expected %x\n",	\
 						(is), (should));	\
 			WARN_ON(!is);			\
 		}							\
 	}

 #define dprintk(level, fmt, arg...) {				\
 		if ((debug) >= (level))					\
 			pr_dbg("vbuf-resource: " fmt, ## arg);		\
 	}

 static void *res_alloc(struct videobuf_queue *q, size_t boff,
 			unsigned long size, resource_size_t *phy_addr)
 {
 	void __iomem *ret = NULL;
 	struct videobuf_res_privdata *res = NULL;
 	long res_size = 0;

 	WARN_ON(!size);

 	WARN_ON(!q->priv_data);

 	res  = (struct videobuf_res_privdata *)q->priv_data;
 	MAGIC_CHECK(res->magic, MAGIC_RE_MEM);

 	res_size = res->end-res->start+1;
 	if (boff+size <= res_size) {
 		*phy_addr = res->start+boff;
 		/* ret = ioremap_wc(*phy_addr,size); */
 		/* if(!ret) */
 		/* *phy_addr = 0; */
 	} else{
 		pr_err("videobuf_res alloc buff is too small: %lx expected %lx\n",
 							res_size, boff+size);
 	}
 	return (void *)ret;
 }

 static void res_free(struct videobuf_res_memory *mem)
 {
 	if (mem->vaddr)
 		iounmap((void __iomem *)mem->vaddr);
 	mem->vaddr = NULL;
 	mem->size = 0;
 	mem->phy_addr = 0;
 	/*return;*/
 }

 static void
 videobuf_vm_open(struct vm_area_struct *vma)
 {
 	struct videobuf_mapping *map = vma->vm_private_data;

 	dprintk(2, "vm_open %p [count=%u,vma=%08lx-%08lx]\n",
 		map, map->count, vma->vm_start, vma->vm_end);

 	map->count++;
 }

 static void videobuf_vm_close(struct vm_area_struct *vma)
 {
 	struct videobuf_mapping *map = vma->vm_private_data;
 	struct videobuf_queue *q = map->q;
 	int i;

 	dprintk(2, "vm_close %p [count=%u,vma=%08lx-%08lx]\n",
 		map, map->count, vma->vm_start, vma->vm_end);

 	map->count--;
 	if (map->count == 0) {
 		struct videobuf_res_memory *mem;

 		dprintk(1, "munmap %p q=%p\n", map, q);
 		videobuf_queue_lock(q);

 		/* We need first to cancel streams, before unmapping */
 		if (q->streaming)
 			videobuf_queue_cancel(q);

 		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 			if (q->bufs[i] == NULL)
 				continue;

 			if (q->bufs[i]->map != map)
 				continue;

 			mem = q->bufs[i]->priv;
 			if (mem) {
 				/* This callback is called only if kernel has
 				 * allocated memory and this memory is mmapped.
 				 * In this case, memory should be freed,
 				 * in order to do memory unmap.
 				 */

 				MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

 				dprintk(1, "buf[%d] freeing %p\n",
 					i, mem->vaddr);

 				res_free(mem);
 			}

 			q->bufs[i]->map   = NULL;
 			q->bufs[i]->baddr = 0;
 		}

 		kfree(map);

 		videobuf_queue_unlock(q);
 	}
 }

 static const struct vm_operations_struct videobuf_vm_ops = {
 	.open     = videobuf_vm_open,
 	.close    = videobuf_vm_close,
 };

 static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
 {
 	struct videobuf_res_memory *mem;
 	struct videobuf_buffer *vb;

 	vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
 	if (vb) {
 		mem = vb->priv = ((char *)vb) + size;
 		mem->magic = MAGIC_RE_MEM;

 		dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
 			__func__, vb, (long)sizeof(*vb),
 			(long)size - sizeof(*vb),
 			mem, (long)sizeof(*mem));
 	}

 	return vb;
 }

 static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
 {
 	struct videobuf_res_memory *mem = buf->priv;

 	WARN_ON(!mem);
 	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

 	return mem->vaddr;
 }

 static int __videobuf_iolock(struct videobuf_queue *q,
 			     struct videobuf_buffer *vb,
 			     struct v4l2_framebuffer *fbuf)
 {
 	struct videobuf_res_memory *mem = vb->priv;

 	WARN_ON(!mem);
 	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

 	switch (vb->memory) {
 	case V4L2_MEMORY_MMAP:
 		dprintk(1, "%s memory method MMAP\n", __func__);

 		/* All handling should be done by __videobuf_mmap_mapper() */
 		if (!mem->phy_addr) {
 			pr_err("%s memory is not alloced/mmapped.\n", __func__);
 			return -EINVAL;
 		}
 		break;
 	case V4L2_MEMORY_USERPTR:
 		dprintk(1, "%s memory method USERPTR\n", __func__);
 		return -EINVAL;
 	case V4L2_MEMORY_OVERLAY:
 	default:
 		dprintk(1, "%s memory method OVERLAY/unknown\n",
 			__func__);
 		return -EINVAL;
 	}

 	return 0;
 }

 static int __videobuf_mmap_mapper(struct videobuf_queue *q,
 				  struct videobuf_buffer *buf,
 				  struct vm_area_struct *vma)
 {
 	struct videobuf_res_memory *mem;
 	struct videobuf_mapping *map;
 	int retval;
 	unsigned long size;

 	dprintk(2, "%s\n", __func__);

 	/* create mapping + update buffer list */
 	map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
 	if (!map)
 		return -ENOMEM;

 	buf->map = map;
 	map->q = q;

 	buf->baddr = vma->vm_start;

 	mem = buf->priv;
 	WARN_ON(!mem);
 	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

 	mem->size = PAGE_ALIGN(buf->bsize);
 	mem->vaddr = res_alloc(q, buf->boff, mem->size, &mem->phy_addr);

 	/* if ((!mem->vaddr)||(!mem->phy_addr)){ */
 	if (!mem->phy_addr) {
 		pr_err("res_alloc size %ld failed\n",
 			mem->size);
 		goto error;
 	}
 	dprintk(1, "res_alloc data is at addr 0x%p (size %lu)\n",
 		(void *)mem->phy_addr, mem->size);

 	/* Try to remap memory */

 	size = vma->vm_end - vma->vm_start;
 	size = (size < mem->size) ? size : mem->size;

 	/* vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); */
 	/* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
 	retval = remap_pfn_range(vma, vma->vm_start,
 				 mem->phy_addr >> PAGE_SHIFT,
 				 size, vma->vm_page_prot);
 	if (retval) {
 		pr_err("mmap: remap failed with error %d. ", retval);
 		res_free(mem);
 		goto error;
 	}

 	vma->vm_ops          = &videobuf_vm_ops;
 	vma->vm_flags       |= (VM_DONTEXPAND | VM_IO |
 				(VM_DONTEXPAND | VM_DONTDUMP));
 	vma->vm_private_data = map;

 	dprintk(1, "mmap %p: q=%p %08lx-%08lx (%lx)",
 		map, q, vma->vm_start, vma->vm_end, (long int)buf->bsize);
 	dprintk(1, "pgoff %08lx buf %d, vm flag 0x%lx\n",
 		vma->vm_pgoff, buf->i, vma->vm_flags);

 	videobuf_vm_open(vma);

 	return 0;

 error:
 	kfree(map);
 	return -ENOMEM;
 }

 static struct videobuf_qtype_ops qops = {
 	.magic        = MAGIC_QTYPE_OPS,

 	.alloc_vb     = __videobuf_alloc_vb,
 	.iolock       = __videobuf_iolock,
 	.mmap_mapper  = __videobuf_mmap_mapper,
 	.vaddr        = __videobuf_to_vaddr,
 };

 int videobuf_queue_res_init(struct videobuf_queue *q,
 				    const struct videobuf_queue_ops *ops,
 				    struct device *dev,
 				    spinlock_t *irqlock,
 				    enum v4l2_buf_type type,
 				    enum v4l2_field field,
 				    unsigned int msize,
 				    void *priv,
 				    struct mutex *ext_lock)
 {
 	struct videobuf_res_privdata *res =
 			(struct videobuf_res_privdata *)priv;

 	WARN_ON(!res);
 	MAGIC_CHECK(res->magic, MAGIC_RE_MEM);

 	if (res->start >= res->end) {
 		pr_err("videobuf_queue_res_init: resource is invalid.\n");
 		return -EINVAL;
 	}
 	videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
 		priv, &qops, ext_lock);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(videobuf_queue_res_init);

 resource_size_t videobuf_to_res(struct videobuf_buffer *buf)
 {
 	struct videobuf_res_memory *mem = buf->priv;

 	WARN_ON(!mem);
 	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

 	return mem->phy_addr;
 }
 EXPORT_SYMBOL_GPL(videobuf_to_res);

 void videobuf_res_free(struct videobuf_queue *q,
 			      struct videobuf_buffer *buf)
 {
 	struct videobuf_res_memory *mem = buf->priv;

 	/* mmapped memory can't be freed here, otherwise mmapped region
 	 * would be released, while still needed. In this case, the memory
 	   release should happen inside videobuf_vm_close().
 	   So, it should free memory only if the memory were allocated for
 	   read() operation.
 	 */
 	if (buf->memory != V4L2_MEMORY_USERPTR)
 		return;

 	if (!mem)
 		return;

 	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

 	/* handle user space pointer case */
 	if (buf->baddr)
 		return;

 	/* read() method */
 	res_free(mem);
 }
 EXPORT_SYMBOL_GPL(videobuf_res_free);

 MODULE_DESCRIPTION("helper module to manage video4linux resource buffers");
 MODULE_AUTHOR("Amlogic");
 MODULE_LICENSE("GPL");
	/*
	* drivers/amlogic/media/common/v4l_util/videobuf-res.c
	*
	* Copyright (C) 2017 Amlogic, Inc. 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.
	*
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/pagemap.h>
	#include <linux/sched.h>
	#include <linux/slab.h>
	#include <linux/amlogic/media/v4l_util/videobuf-res.h>
	#include <linux/io.h>
	#include <linux/printk.h>

	struct videobuf_res_memory {
	u32 magic;
	void *vaddr;
	resource_size_t phy_addr;
	unsigned long size;
	};

	static int debug;
	module_param(debug, int, 0644);

	#define pr_dbg(fmt, args...) pr_info("videobuf-res: " fmt, ## args)

	#define MAGIC_RE_MEM 0x123039dc
	#define MAGIC_CHECK(is, should) { \
	if (unlikely((is) != (should))) { \
	pr_err("magic mismatch: %x expected %x\n", \
	(is), (should)); \
	WARN_ON(!is); \
	} \
	}

	#define dprintk(level, fmt, arg...) { \
	if ((debug) >= (level)) \
	pr_dbg("vbuf-resource: " fmt, ## arg); \
	}

	static void res_alloc(struct videobuf_queue q, size_t boff,
	unsigned long size, resource_size_t *phy_addr)
	{
	void __iomem *ret = NULL;
	struct videobuf_res_privdata *res = NULL;
	long res_size = 0;

	WARN_ON(!size);

	WARN_ON(!q->priv_data);

	res = (struct videobuf_res_privdata *)q->priv_data;
	MAGIC_CHECK(res->magic, MAGIC_RE_MEM);

	res_size = res->end-res->start+1;
	if (boff+size <= res_size) {
	*phy_addr = res->start+boff;
	/* ret = ioremap_wc(phy_addr,size); /
	/* if(!ret) */
	/* phy_addr = 0; /
	} else{
	pr_err("videobuf_res alloc buff is too small: %lx expected %lx\n",
	res_size, boff+size);
	}
	return (void *)ret;
	}

	static void res_free(struct videobuf_res_memory *mem)
	{
	if (mem->vaddr)
	iounmap((void __iomem *)mem->vaddr);
	mem->vaddr = NULL;
	mem->size = 0;
	mem->phy_addr = 0;
	/return;/
	}

	static void
	videobuf_vm_open(struct vm_area_struct *vma)
	{
	struct videobuf_mapping *map = vma->vm_private_data;

	dprintk(2, "vm_open %p [count=%u,vma=%08lx-%08lx]\n",
	map, map->count, vma->vm_start, vma->vm_end);

	map->count++;
	}

	static void videobuf_vm_close(struct vm_area_struct *vma)
	{
	struct videobuf_mapping *map = vma->vm_private_data;
	struct videobuf_queue *q = map->q;
	int i;

	dprintk(2, "vm_close %p [count=%u,vma=%08lx-%08lx]\n",
	map, map->count, vma->vm_start, vma->vm_end);

	map->count--;
	if (map->count == 0) {
	struct videobuf_res_memory *mem;

	dprintk(1, "munmap %p q=%p\n", map, q);
	videobuf_queue_lock(q);

	/* We need first to cancel streams, before unmapping */
	if (q->streaming)
	videobuf_queue_cancel(q);

	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
	if (q->bufs[i] == NULL)
	continue;

	if (q->bufs[i]->map != map)
	continue;

	mem = q->bufs[i]->priv;
	if (mem) {
	/* This callback is called only if kernel has
	* allocated memory and this memory is mmapped.
	* In this case, memory should be freed,
	* in order to do memory unmap.
	*/

	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

	dprintk(1, "buf[%d] freeing %p\n",
	i, mem->vaddr);

	res_free(mem);
	}

	q->bufs[i]->map = NULL;
	q->bufs[i]->baddr = 0;
	}

	kfree(map);

	videobuf_queue_unlock(q);
	}
	}

	static const struct vm_operations_struct videobuf_vm_ops = {
	.open = videobuf_vm_open,
	.close = videobuf_vm_close,
	};

	static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
	{
	struct videobuf_res_memory *mem;
	struct videobuf_buffer *vb;

	vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
	if (vb) {
	mem = vb->priv = ((char *)vb) + size;
	mem->magic = MAGIC_RE_MEM;

	dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
	__func__, vb, (long)sizeof(*vb),
	(long)size - sizeof(*vb),
	mem, (long)sizeof(*mem));
	}

	return vb;
	}

	static void __videobuf_to_vaddr(struct videobuf_buffer buf)
	{
	struct videobuf_res_memory *mem = buf->priv;

	WARN_ON(!mem);
	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

	return mem->vaddr;
	}

	static int __videobuf_iolock(struct videobuf_queue *q,
	struct videobuf_buffer *vb,
	struct v4l2_framebuffer *fbuf)
	{
	struct videobuf_res_memory *mem = vb->priv;

	WARN_ON(!mem);
	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
	dprintk(1, "%s memory method MMAP\n", __func__);

	/* All handling should be done by __videobuf_mmap_mapper() */
	if (!mem->phy_addr) {
	pr_err("%s memory is not alloced/mmapped.\n", __func__);
	return -EINVAL;
	}
	break;
	case V4L2_MEMORY_USERPTR:
	dprintk(1, "%s memory method USERPTR\n", __func__);
	return -EINVAL;
	case V4L2_MEMORY_OVERLAY:
	default:
	dprintk(1, "%s memory method OVERLAY/unknown\n",
	__func__);
	return -EINVAL;
	}

	return 0;
	}

	static int __videobuf_mmap_mapper(struct videobuf_queue *q,
	struct videobuf_buffer *buf,
	struct vm_area_struct *vma)
	{
	struct videobuf_res_memory *mem;
	struct videobuf_mapping *map;
	int retval;
	unsigned long size;

	dprintk(2, "%s\n", __func__);

	/* create mapping + update buffer list */
	map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
	if (!map)
	return -ENOMEM;

	buf->map = map;
	map->q = q;

	buf->baddr = vma->vm_start;

	mem = buf->priv;
	WARN_ON(!mem);
	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

	mem->size = PAGE_ALIGN(buf->bsize);
	mem->vaddr = res_alloc(q, buf->boff, mem->size, &mem->phy_addr);

	/* if ((!mem->vaddr)\|\|(!mem->phy_addr)){ */
	if (!mem->phy_addr) {
	pr_err("res_alloc size %ld failed\n",
	mem->size);
	goto error;
	}
	dprintk(1, "res_alloc data is at addr 0x%p (size %lu)\n",
	(void *)mem->phy_addr, mem->size);

	/* Try to remap memory */

	size = vma->vm_end - vma->vm_start;
	size = (size < mem->size) ? size : mem->size;

	/* vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); */
	/* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
	retval = remap_pfn_range(vma, vma->vm_start,
	mem->phy_addr >> PAGE_SHIFT,
	size, vma->vm_page_prot);
	if (retval) {
	pr_err("mmap: remap failed with error %d. ", retval);
	res_free(mem);
	goto error;
	}

	vma->vm_ops = &videobuf_vm_ops;
	vma->vm_flags \|= (VM_DONTEXPAND \| VM_IO \|
	(VM_DONTEXPAND \| VM_DONTDUMP));
	vma->vm_private_data = map;

	dprintk(1, "mmap %p: q=%p %08lx-%08lx (%lx)",
	map, q, vma->vm_start, vma->vm_end, (long int)buf->bsize);
	dprintk(1, "pgoff %08lx buf %d, vm flag 0x%lx\n",
	vma->vm_pgoff, buf->i, vma->vm_flags);

	videobuf_vm_open(vma);

	return 0;

	error:
	kfree(map);
	return -ENOMEM;
	}

	static struct videobuf_qtype_ops qops = {
	.magic = MAGIC_QTYPE_OPS,

	.alloc_vb = __videobuf_alloc_vb,
	.iolock = __videobuf_iolock,
	.mmap_mapper = __videobuf_mmap_mapper,
	.vaddr = __videobuf_to_vaddr,
	};

	int videobuf_queue_res_init(struct videobuf_queue *q,
	const struct videobuf_queue_ops *ops,
	struct device *dev,
	spinlock_t *irqlock,
	enum v4l2_buf_type type,
	enum v4l2_field field,
	unsigned int msize,
	void *priv,
	struct mutex *ext_lock)
	{
	struct videobuf_res_privdata *res =
	(struct videobuf_res_privdata *)priv;

	WARN_ON(!res);
	MAGIC_CHECK(res->magic, MAGIC_RE_MEM);

	if (res->start >= res->end) {
	pr_err("videobuf_queue_res_init: resource is invalid.\n");
	return -EINVAL;
	}
	videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
	priv, &qops, ext_lock);
	return 0;
	}
	EXPORT_SYMBOL_GPL(videobuf_queue_res_init);

	resource_size_t videobuf_to_res(struct videobuf_buffer *buf)
	{
	struct videobuf_res_memory *mem = buf->priv;

	WARN_ON(!mem);
	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

	return mem->phy_addr;
	}
	EXPORT_SYMBOL_GPL(videobuf_to_res);

	void videobuf_res_free(struct videobuf_queue *q,
	struct videobuf_buffer *buf)
	{
	struct videobuf_res_memory *mem = buf->priv;

	/* mmapped memory can't be freed here, otherwise mmapped region
	* would be released, while still needed. In this case, the memory
	release should happen inside videobuf_vm_close().
	So, it should free memory only if the memory were allocated for
	read() operation.
	*/
	if (buf->memory != V4L2_MEMORY_USERPTR)
	return;

	if (!mem)
	return;

	MAGIC_CHECK(mem->magic, MAGIC_RE_MEM);

	/* handle user space pointer case */
	if (buf->baddr)
	return;

	/* read() method */
	res_free(mem);
	}
	EXPORT_SYMBOL_GPL(videobuf_res_free);

	MODULE_DESCRIPTION("helper module to manage video4linux resource buffers");
	MODULE_AUTHOR("Amlogic");
	MODULE_LICENSE("GPL");