mirror of
https://github.com/adulau/aha.git
synced 2024-12-29 12:16:20 +00:00
V4L/DVB (5147): Make vivi driver to use vmalloced pointers
Before this patch, vivi were simulating a scatter gather DMA transfer. While this is academic, showing how stuff really works on a real PCI device, this means a non-optimized code. There are only two memory models that vivi implements: 1) kernel alloced memory. This is also used by read() method. On this case, a vmalloc32 buffer is allocated at kernel; 2) userspace allocated memory. This is used by most userspace apps. video-buf will store this pointer. a simple copy_to_user is enough to transfer data. The third memory model scenario supported by video-buf is overlay mode. This model is not implemented on vivi and unlikely to be implemented on newer drivers, since now, most userspace apps do some post-processing (like de-interlacing). After this patch, some cleanups may be done at video-buf.c to avoid allocating pages, when the driver doesn't need a PCI buffer. This is the case of vivi and usb drivers. Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab
parent
52ebc763d8
commit
b50e7fe993
3 changed files with 78 additions and 11 deletions
|
|
@ -148,6 +148,8 @@ int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
|
|||
dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
|
||||
data,size,dma->nr_pages);
|
||||
|
||||
dma->varea = (void *) data;
|
||||
|
||||
down_read(¤t->mm->mmap_sem);
|
||||
err = get_user_pages(current,current->mm,
|
||||
data & PAGE_MASK, dma->nr_pages,
|
||||
|
|
@ -285,6 +287,7 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma)
|
|||
|
||||
vfree(dma->vmalloc);
|
||||
dma->vmalloc = NULL;
|
||||
dma->varea = NULL;
|
||||
|
||||
if (dma->bus_addr) {
|
||||
dma->bus_addr = 0;
|
||||
|
|
|
|||
|
|
@ -145,7 +145,9 @@ struct vivi_buffer {
|
|||
|
||||
struct vivi_fmt *fmt;
|
||||
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
struct sg_to_addr *to_addr;
|
||||
#endif
|
||||
};
|
||||
|
||||
struct vivi_dmaqueue {
|
||||
|
|
@ -230,6 +232,7 @@ static u8 bars[8][3] = {
|
|||
#define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
|
||||
#define TSTAMP_MIN_X 64
|
||||
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
static void prep_to_addr(struct sg_to_addr to_addr[],
|
||||
struct videobuf_buffer *vb)
|
||||
{
|
||||
|
|
@ -262,14 +265,24 @@ static int get_addr_pos(int pos, int pages, struct sg_to_addr to_addr[])
|
|||
|
||||
return (p1);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
|
||||
int hmax, int line, char *timestr)
|
||||
#else
|
||||
static void gen_line(char *basep,int inipos,int wmax,
|
||||
int hmax, int line, char *timestr)
|
||||
#endif
|
||||
{
|
||||
int w,i,j,pos=inipos,pgpos,oldpg,y;
|
||||
char *p,*s,*basep;
|
||||
struct page *pg;
|
||||
int w,i,j,pos=inipos,y;
|
||||
char *p,*s;
|
||||
u8 chr,r,g,b,color;
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
int pgpos,oldpg;
|
||||
char *basep;
|
||||
struct page *pg;
|
||||
|
||||
unsigned long flags;
|
||||
spinlock_t spinlock;
|
||||
|
||||
|
|
@ -280,6 +293,7 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
|
|||
pg=pfn_to_page(sg_dma_address(to_addr[oldpg].sg) >> PAGE_SHIFT);
|
||||
spin_lock_irqsave(&spinlock,flags);
|
||||
basep = kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[oldpg].sg->offset;
|
||||
#endif
|
||||
|
||||
/* We will just duplicate the second pixel at the packet */
|
||||
wmax/=2;
|
||||
|
|
@ -291,6 +305,7 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
|
|||
b=bars[w*7/wmax][2];
|
||||
|
||||
for (color=0;color<4;color++) {
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
pgpos=get_addr_pos(pos,pages,to_addr);
|
||||
if (pgpos!=oldpg) {
|
||||
pg=pfn_to_page(sg_dma_address(to_addr[pgpos].sg) >> PAGE_SHIFT);
|
||||
|
|
@ -299,6 +314,9 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
|
|||
oldpg=pgpos;
|
||||
}
|
||||
p=basep+pos-to_addr[pgpos].pos;
|
||||
#else
|
||||
p=basep+pos;
|
||||
#endif
|
||||
|
||||
switch (color) {
|
||||
case 0:
|
||||
|
|
@ -343,6 +361,7 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
|
|||
|
||||
pos=inipos+j*2;
|
||||
for (color=0;color<4;color++) {
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
pgpos=get_addr_pos(pos,pages,to_addr);
|
||||
if (pgpos!=oldpg) {
|
||||
pg=pfn_to_page(sg_dma_address(
|
||||
|
|
@ -356,6 +375,9 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
|
|||
oldpg=pgpos;
|
||||
}
|
||||
p=basep+pos-to_addr[pgpos].pos;
|
||||
#else
|
||||
p=basep+pos;
|
||||
#endif
|
||||
|
||||
y=TO_Y(r,g,b);
|
||||
|
||||
|
|
@ -380,19 +402,27 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
|
|||
|
||||
|
||||
end:
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
kunmap_atomic(basep, KM_BOUNCE_READ);
|
||||
spin_unlock_irqrestore(&spinlock,flags);
|
||||
|
||||
#else
|
||||
return;
|
||||
#endif
|
||||
}
|
||||
static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
|
||||
{
|
||||
int h,pos=0;
|
||||
int hmax = buf->vb.height;
|
||||
int wmax = buf->vb.width;
|
||||
struct videobuf_buffer *vb=&buf->vb;
|
||||
struct sg_to_addr *to_addr=buf->to_addr;
|
||||
struct timeval ts;
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
struct sg_to_addr *to_addr=buf->to_addr;
|
||||
struct videobuf_buffer *vb=&buf->vb;
|
||||
#else
|
||||
char *tmpbuf;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
/* Test if DMA mapping is ready */
|
||||
if (!sg_dma_address(&vb->dma.sglist[0]))
|
||||
return;
|
||||
|
|
@ -401,9 +431,27 @@ static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
|
|||
|
||||
/* Check if there is enough memory */
|
||||
BUG_ON(buf->vb.dma.nr_pages << PAGE_SHIFT < (buf->vb.width*buf->vb.height)*2);
|
||||
#else
|
||||
if (buf->vb.dma.varea) {
|
||||
tmpbuf=kmalloc (wmax*2, GFP_KERNEL);
|
||||
} else {
|
||||
tmpbuf=buf->vb.dma.vmalloc;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
for (h=0;h<hmax;h++) {
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
gen_line(to_addr,pos,vb->dma.nr_pages,wmax,hmax,h,dev->timestr);
|
||||
#else
|
||||
if (buf->vb.dma.varea) {
|
||||
gen_line(tmpbuf,0,wmax,hmax,h,dev->timestr);
|
||||
/* FIXME: replacing to __copy_to_user */
|
||||
copy_to_user(buf->vb.dma.varea+pos,tmpbuf,wmax*2);
|
||||
} else {
|
||||
gen_line(tmpbuf,pos,wmax,hmax,h,dev->timestr);
|
||||
}
|
||||
#endif
|
||||
pos += wmax*2;
|
||||
}
|
||||
|
||||
|
|
@ -429,7 +477,7 @@ static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
|
|||
dev->h,dev->m,dev->s,(dev->us+500)/1000);
|
||||
|
||||
dprintk(2,"vivifill at %s: Buffer 0x%08lx size= %d\n",dev->timestr,
|
||||
(unsigned long)buf->vb.dma.vmalloc,pos);
|
||||
(unsigned long)buf->vb.dma.varea,pos);
|
||||
|
||||
/* Advice that buffer was filled */
|
||||
buf->vb.state = STATE_DONE;
|
||||
|
|
@ -668,9 +716,11 @@ static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
|
|||
if (in_interrupt())
|
||||
BUG();
|
||||
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
/*FIXME: Maybe a spinlock is required here */
|
||||
kfree(buf->to_addr);
|
||||
buf->to_addr=NULL;
|
||||
#endif
|
||||
|
||||
videobuf_waiton(&buf->vb,0,0);
|
||||
videobuf_dma_unmap(vq, &buf->vb.dma);
|
||||
|
|
@ -716,11 +766,12 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
|
|||
|
||||
buf->vb.state = STATE_PREPARED;
|
||||
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
if (NULL == (buf->to_addr = kmalloc(sizeof(*buf->to_addr) * vb->dma.nr_pages,GFP_KERNEL))) {
|
||||
rc=-ENOMEM;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
#endif
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
|
|
@ -785,6 +836,7 @@ static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb
|
|||
free_buffer(vq,buf);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
static int vivi_map_sg(void *dev, struct scatterlist *sg, int nents,
|
||||
int direction)
|
||||
{
|
||||
|
|
@ -817,6 +869,7 @@ static int vivi_dma_sync_sg(void *dev,struct scatterlist *sglist, int nr_pages,
|
|||
// flush_write_buffers();
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static struct videobuf_queue_ops vivi_video_qops = {
|
||||
.buf_setup = buffer_setup,
|
||||
|
|
@ -825,9 +878,9 @@ static struct videobuf_queue_ops vivi_video_qops = {
|
|||
.buf_release = buffer_release,
|
||||
|
||||
/* Non-pci handling routines */
|
||||
.vb_map_sg = vivi_map_sg,
|
||||
.vb_dma_sync_sg = vivi_dma_sync_sg,
|
||||
.vb_unmap_sg = vivi_unmap_sg,
|
||||
// .vb_map_sg = vivi_map_sg,
|
||||
// .vb_dma_sync_sg = vivi_dma_sync_sg,
|
||||
// .vb_unmap_sg = vivi_unmap_sg,
|
||||
};
|
||||
|
||||
/* ------------------------------------------------------------------
|
||||
|
|
@ -1205,11 +1258,19 @@ static int vivi_open(struct inode *inode, struct file *file)
|
|||
sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
|
||||
dev->h,dev->m,dev->s,(dev->us+500)/1000);
|
||||
|
||||
#ifdef CONFIG_VIVI_SCATTER
|
||||
videobuf_queue_init(&fh->vb_vidq,VIDEOBUF_DMA_SCATTER, &vivi_video_qops,
|
||||
NULL, NULL,
|
||||
fh->type,
|
||||
V4L2_FIELD_INTERLACED,
|
||||
sizeof(struct vivi_buffer),fh);
|
||||
#else
|
||||
videobuf_queue_init(&fh->vb_vidq, &vivi_video_qops,
|
||||
NULL, NULL,
|
||||
fh->type,
|
||||
V4L2_FIELD_INTERLACED,
|
||||
sizeof(struct vivi_buffer),fh);
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -78,6 +78,9 @@ struct videobuf_dmabuf {
|
|||
/* for kernel buffers */
|
||||
void *vmalloc;
|
||||
|
||||
/* Stores the userspace pointer to vmalloc area */
|
||||
void *varea;
|
||||
|
||||
/* for overlay buffers (pci-pci dma) */
|
||||
dma_addr_t bus_addr;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue