/*
* helper functions for physically contiguous capture buffers
*
* The functions expect the hardware being able to scatter gather
* (i.e. the buffers are not linear in physical memory, but fragmented
* into PAGE_SIZE chunks). They also assume the driver does not need
* to touch the video data.
*
* (c) 2009 modified from videobuf-dma-contig by Seen Yang,
*
* 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
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <media/videobuf-contig.h>
#define MAGIC_PC_MEM 0x18666666
#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
{ printk( "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
static int debug;
module_param(debug, int, 0644);
MODULE_DESCRIPTION("helper module to manage video4linux physic continue buffers");
MODULE_AUTHOR("Seen Yang, ");
MODULE_LICENSE("GPL");
#define dprintk(level, fmt, arg...) if (debug >= level) \
printk(KERN_DEBUG "vbuf-contig: " fmt , ## arg)
struct videobuf_contig_memory
{
u32 magic;
dma_addr_t paddr;
void *vaddr;
u32 size;
};
/* Allocate physic continue memory for buffers */
static void *malloc_contig(u32 buf_size)
{
void *mem = 0;
u32 size = PAGE_SIZE << (get_order(buf_size));
mem = (void *)__get_dma_pages(GFP_KERNEL,
get_order(buf_size));
if (mem) {
unsigned long adr = (unsigned long)mem;
while (size > 0) {
SetPageReserved(virt_to_page(adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
} else
printk( "dma memory can't be alloced!!\n");
return mem;
}
/* Free memory for buffers */
static void free_contig(void *addr, u32 buf_size)
{
u32 size, adr;
if (!addr)
return;
adr = (u32)addr;
size = PAGE_SIZE << (get_order(buf_size));
while (size > 0) {
ClearPageReserved(virt_to_page(adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
free_pages((u32)addr, get_order(buf_size));
}
/***************************************************************************/
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 (0 == map->count) {
struct videobuf_contig_memory *mem;
dprintk(1, "munmap %p q=%p\n", map, q);
mutex_lock(&q->vb_lock);
/* We need first to cancel streams, before unmapping */
if (q->streaming)
videobuf_queue_cancel(q);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
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_PC_MEM);
dprintk(1, "%s: buf[%d] freeing (%d)\n",
__func__, i, mem->paddr);
free_contig(mem->vaddr, mem->size);
mem->paddr = 0;
mem->vaddr = NULL;
}
q->bufs[i]->map = NULL;
q->bufs[i]->baddr = 0;
}
kfree(map);
mutex_unlock(&q->vb_lock);
}
return;
}
static struct vm_operations_struct videobuf_vm_ops =
{
.open = videobuf_vm_open,
.close = videobuf_vm_close,
};
/* ---------------------------------------------------------------------
* contig handlers for the generic methods
*/
/* Allocated area consists on 3 parts:
struct video_buffer
struct _buffer (cx88_buffer, saa7134_buf, ...)
struct videobuf_dma_sg_memory
*/
static void *__videobuf_alloc(size_t size)
{
struct videobuf_contig_memory *mem;
struct videobuf_buffer *vb;
vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
mem = vb->priv = ((char *)vb)+size;
mem->magic=MAGIC_PC_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 int __videobuf_iolock (struct videobuf_queue* q,
struct videobuf_buffer *vb,
struct v4l2_framebuffer *fbuf)
{
struct videobuf_contig_memory *mem = vb->priv;
BUG_ON(!mem);
MAGIC_CHECK(mem->magic, MAGIC_PC_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->paddr) {
printk(KERN_ERR "memory is not alloced/mmapped.\n");
return -EINVAL;
}
break;
case V4L2_MEMORY_USERPTR:
dprintk(1, "%s memory method USERPTR\n", __func__);
if (vb->baddr) {
printk(KERN_ERR "USERPTR is currently not supported\n");
return -EINVAL;
}
/* The only USERPTR currently supported is the one needed for
read() method.
*/
mem->size = PAGE_ALIGN(vb->size);
mem->vaddr = malloc_contig(mem->size);
if (!mem->vaddr) {
printk(KERN_ERR "malloc_contig (%d pages) failed\n", mem->size);
return -ENOMEM;
}
mem->paddr = virt_to_phys(mem->vaddr);
dprintk(1, "malloc_contig is at addr %d (%d pages)\n",
mem->paddr, mem->size);
break;
case V4L2_MEMORY_OVERLAY:
default:
dprintk(1, "%s memory method OVERLAY/unknown\n", __func__);
/* Currently, doesn't support V4L2_MEMORY_OVERLAY */
printk(KERN_ERR "Memory method currently unsupported.\n");
return -EINVAL;
}
return 0;
}
static int __videobuf_sync(struct videobuf_queue *q,
struct videobuf_buffer *buf)
{
return 0;
}
static int __videobuf_mmap_free(struct videobuf_queue *q)
{
unsigned int i;
dprintk(1, "%s\n", __func__);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (q->bufs[i]) {
if (q->bufs[i]->map)
return -EBUSY;
}
}
return 0;
}
static int __videobuf_mmap_mapper(struct videobuf_queue *q,
struct vm_area_struct *vma)
{
struct videobuf_contig_memory *mem;
struct videobuf_mapping *map;
unsigned int first;
int retval, size;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
dprintk(1, "%s\n", __func__);
if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
return -EINVAL;
/* look for first buffer to map */
for (first = 0; first < VIDEO_MAX_FRAME; first++) {
if (NULL == q->bufs[first])
continue;
if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
continue;
if (q->bufs[first]->boff == offset)
break;
}
if (VIDEO_MAX_FRAME == first) {
dprintk(1,"mmap app bug: invalid user space offset [offset=0x%lx]\n",
(vma->vm_pgoff << PAGE_SHIFT));
return -EINVAL;
}
/* create mapping + update buffer list */
map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
if (NULL == map)
return -ENOMEM;
q->bufs[first]->map = map;
map->start = vma->vm_start;
map->end = vma->vm_end;
map->q = q;
q->bufs[first]->baddr = vma->vm_start;
mem = q->bufs[first]->priv;
BUG_ON(!mem);
MAGIC_CHECK(mem->magic, MAGIC_PC_MEM);
mem->size = PAGE_ALIGN(q->bufs[first]->bsize);
mem->vaddr = malloc_contig(mem->size);
if (!mem->vaddr) {
printk(KERN_ERR "malloc_contig (%d size) failed\n", mem->size);
goto error;
}
mem->paddr = virt_to_phys(mem->vaddr);
dprintk(1, "malloc_contig is at addr %i (%d size)\n",
mem->paddr, mem->size);
size = vma->vm_end - vma->vm_start;
size = (size < mem->size) ? size : mem->size;
/* Try to remap memory */
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
retval = remap_pfn_range(vma, vma->vm_start,
mem->paddr >> PAGE_SHIFT,
size, vma->vm_page_prot);
if (retval < 0) {
printk(KERN_ERR "mmap: remap failed with error %d. ", retval);
free_contig(mem->vaddr, mem->size);
goto error;
}
vma->vm_ops = &videobuf_vm_ops;
vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
vma->vm_private_data = map;
dprintk(1,"mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
map, q, vma->vm_start, vma->vm_end,
(long int) q->bufs[first]->bsize,
vma->vm_pgoff, first);
videobuf_vm_open(vma);
return 0;
error:
mem = NULL;
kfree(map);
return -ENOMEM;
}
static int __videobuf_copy_to_user ( struct videobuf_queue *q,
char __user *data, size_t count,
int nonblocking )
{
struct videobuf_contig_memory *mem = q->read_buf->priv;
void *vaddr;
BUG_ON(!mem);
MAGIC_CHECK(mem->magic, MAGIC_PC_MEM);
BUG_ON(!mem->vaddr);
/* copy to userspace */
if (count > q->read_buf->size - q->read_off)
count = q->read_buf->size - q->read_off;
vaddr = mem->vaddr;
if (copy_to_user(data, vaddr + q->read_off, count))
return -EFAULT;
return count;
}
static int __videobuf_copy_stream ( struct videobuf_queue *q,
char __user *data, size_t count, size_t pos,
int vbihack, int nonblocking )
{
unsigned int *fc;
struct videobuf_contig_memory *mem=q->read_buf->priv;
BUG_ON (!mem);
MAGIC_CHECK(mem->magic,MAGIC_PC_MEM);
if (vbihack) {
/* dirty, undocumented hack -- pass the frame counter
* within the last four bytes of each vbi data block.
* We need that one to maintain backward compatibility
* to all vbi decoding software out there ... */
fc = (unsigned int*)mem->vaddr;
fc += (q->read_buf->size>>2) -1;
*fc = q->read_buf->field_count >> 1;
dprintk(1,"vbihack: %d\n",*fc);
}
/* copy stuff using the common method */
count = __videobuf_copy_to_user (q, data, count, nonblocking);
if ( (count==-EFAULT) && (0 == pos) )
return -EFAULT;
return count;
}
static void *__videobuf_to_vmalloc(struct videobuf_buffer *buf)
{
struct videobuf_contig_memory *mem = buf->priv;
BUG_ON(!mem);
MAGIC_CHECK(mem->magic, MAGIC_PC_MEM);
return mem->vaddr;
}
static struct videobuf_qtype_ops qops = {
.magic = MAGIC_QTYPE_OPS,
.alloc = __videobuf_alloc,
.iolock = __videobuf_iolock,
.sync = __videobuf_sync,
.mmap_free = __videobuf_mmap_free,
.mmap_mapper = __videobuf_mmap_mapper,
.video_copy_to_user = __videobuf_copy_to_user,
.copy_stream = __videobuf_copy_stream,
.vmalloc = __videobuf_to_vmalloc,
};
void videobuf_queue_contig_init(struct videobuf_queue* q,
struct videobuf_queue_ops *ops,
void *dev,
spinlock_t *irqlock,
enum v4l2_buf_type type,
enum v4l2_field field,
unsigned int msize,
void *priv)
{
videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
priv, &qops);
}
EXPORT_SYMBOL_GPL(videobuf_queue_contig_init);
u32 videobuf_to_contig (struct videobuf_buffer *buf)
{
struct videobuf_contig_memory *mem=buf->priv;
BUG_ON (!mem);
MAGIC_CHECK(mem->magic,MAGIC_PC_MEM);
return mem->paddr;
}
EXPORT_SYMBOL_GPL(videobuf_to_contig);
void videobuf_contig_free (struct videobuf_buffer *buf)
{
struct videobuf_contig_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) || !buf->baddr)
return;
if (!mem)
return;
MAGIC_CHECK(mem->magic, MAGIC_PC_MEM);
free_contig(mem->vaddr, mem->size);
mem->paddr = 0;
mem->vaddr = NULL;
return;
}
EXPORT_SYMBOL_GPL(videobuf_contig_free);
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