mirror of https://gitee.com/openkylin/linux.git
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
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@ -148,6 +148,8 @@ int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
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dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
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data,size,dma->nr_pages);
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dma->varea = (void *) data;
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down_read(¤t->mm->mmap_sem);
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err = get_user_pages(current,current->mm,
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data & PAGE_MASK, dma->nr_pages,
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@ -285,6 +287,7 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma)
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vfree(dma->vmalloc);
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dma->vmalloc = NULL;
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dma->varea = NULL;
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if (dma->bus_addr) {
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dma->bus_addr = 0;
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@ -145,7 +145,9 @@ struct vivi_buffer {
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struct vivi_fmt *fmt;
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#ifdef CONFIG_VIVI_SCATTER
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struct sg_to_addr *to_addr;
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#endif
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};
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struct vivi_dmaqueue {
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@ -230,6 +232,7 @@ static u8 bars[8][3] = {
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#define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
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#define TSTAMP_MIN_X 64
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#ifdef CONFIG_VIVI_SCATTER
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static void prep_to_addr(struct sg_to_addr to_addr[],
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struct videobuf_buffer *vb)
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{
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@ -262,14 +265,24 @@ static int get_addr_pos(int pos, int pages, struct sg_to_addr to_addr[])
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return (p1);
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}
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#endif
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#ifdef CONFIG_VIVI_SCATTER
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static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
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int hmax, int line, char *timestr)
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#else
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static void gen_line(char *basep,int inipos,int wmax,
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int hmax, int line, char *timestr)
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#endif
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{
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int w,i,j,pos=inipos,pgpos,oldpg,y;
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char *p,*s,*basep;
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struct page *pg;
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int w,i,j,pos=inipos,y;
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char *p,*s;
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u8 chr,r,g,b,color;
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#ifdef CONFIG_VIVI_SCATTER
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int pgpos,oldpg;
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char *basep;
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struct page *pg;
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unsigned long flags;
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spinlock_t spinlock;
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@ -280,6 +293,7 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
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pg=pfn_to_page(sg_dma_address(to_addr[oldpg].sg) >> PAGE_SHIFT);
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spin_lock_irqsave(&spinlock,flags);
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basep = kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[oldpg].sg->offset;
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#endif
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/* We will just duplicate the second pixel at the packet */
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wmax/=2;
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@ -291,6 +305,7 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
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b=bars[w*7/wmax][2];
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for (color=0;color<4;color++) {
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#ifdef CONFIG_VIVI_SCATTER
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pgpos=get_addr_pos(pos,pages,to_addr);
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if (pgpos!=oldpg) {
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pg=pfn_to_page(sg_dma_address(to_addr[pgpos].sg) >> PAGE_SHIFT);
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@ -299,6 +314,9 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
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oldpg=pgpos;
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}
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p=basep+pos-to_addr[pgpos].pos;
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#else
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p=basep+pos;
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#endif
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switch (color) {
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case 0:
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@ -343,6 +361,7 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
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pos=inipos+j*2;
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for (color=0;color<4;color++) {
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#ifdef CONFIG_VIVI_SCATTER
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pgpos=get_addr_pos(pos,pages,to_addr);
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if (pgpos!=oldpg) {
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pg=pfn_to_page(sg_dma_address(
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@ -356,6 +375,9 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
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oldpg=pgpos;
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}
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p=basep+pos-to_addr[pgpos].pos;
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#else
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p=basep+pos;
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#endif
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y=TO_Y(r,g,b);
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@ -380,19 +402,27 @@ static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
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end:
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#ifdef CONFIG_VIVI_SCATTER
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kunmap_atomic(basep, KM_BOUNCE_READ);
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spin_unlock_irqrestore(&spinlock,flags);
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#else
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return;
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#endif
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}
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static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
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{
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int h,pos=0;
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int hmax = buf->vb.height;
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int wmax = buf->vb.width;
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struct videobuf_buffer *vb=&buf->vb;
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struct sg_to_addr *to_addr=buf->to_addr;
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struct timeval ts;
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#ifdef CONFIG_VIVI_SCATTER
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struct sg_to_addr *to_addr=buf->to_addr;
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struct videobuf_buffer *vb=&buf->vb;
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#else
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char *tmpbuf;
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#endif
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#ifdef CONFIG_VIVI_SCATTER
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/* Test if DMA mapping is ready */
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if (!sg_dma_address(&vb->dma.sglist[0]))
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return;
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@ -401,9 +431,27 @@ static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
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/* Check if there is enough memory */
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BUG_ON(buf->vb.dma.nr_pages << PAGE_SHIFT < (buf->vb.width*buf->vb.height)*2);
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#else
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if (buf->vb.dma.varea) {
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tmpbuf=kmalloc (wmax*2, GFP_KERNEL);
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} else {
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tmpbuf=buf->vb.dma.vmalloc;
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}
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#endif
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for (h=0;h<hmax;h++) {
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#ifdef CONFIG_VIVI_SCATTER
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gen_line(to_addr,pos,vb->dma.nr_pages,wmax,hmax,h,dev->timestr);
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#else
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if (buf->vb.dma.varea) {
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gen_line(tmpbuf,0,wmax,hmax,h,dev->timestr);
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/* FIXME: replacing to __copy_to_user */
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copy_to_user(buf->vb.dma.varea+pos,tmpbuf,wmax*2);
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} else {
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gen_line(tmpbuf,pos,wmax,hmax,h,dev->timestr);
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}
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#endif
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pos += wmax*2;
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}
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@ -429,7 +477,7 @@ static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
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dev->h,dev->m,dev->s,(dev->us+500)/1000);
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dprintk(2,"vivifill at %s: Buffer 0x%08lx size= %d\n",dev->timestr,
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(unsigned long)buf->vb.dma.vmalloc,pos);
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(unsigned long)buf->vb.dma.varea,pos);
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/* Advice that buffer was filled */
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buf->vb.state = STATE_DONE;
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@ -668,9 +716,11 @@ static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
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if (in_interrupt())
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BUG();
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#ifdef CONFIG_VIVI_SCATTER
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/*FIXME: Maybe a spinlock is required here */
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kfree(buf->to_addr);
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buf->to_addr=NULL;
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#endif
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videobuf_waiton(&buf->vb,0,0);
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videobuf_dma_unmap(vq, &buf->vb.dma);
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@ -716,11 +766,12 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
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buf->vb.state = STATE_PREPARED;
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#ifdef CONFIG_VIVI_SCATTER
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if (NULL == (buf->to_addr = kmalloc(sizeof(*buf->to_addr) * vb->dma.nr_pages,GFP_KERNEL))) {
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rc=-ENOMEM;
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goto fail;
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}
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#endif
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return 0;
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fail:
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@ -785,6 +836,7 @@ static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb
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free_buffer(vq,buf);
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}
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#ifdef CONFIG_VIVI_SCATTER
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static int vivi_map_sg(void *dev, struct scatterlist *sg, int nents,
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int direction)
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{
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@ -817,6 +869,7 @@ static int vivi_dma_sync_sg(void *dev,struct scatterlist *sglist, int nr_pages,
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// flush_write_buffers();
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return 0;
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}
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#endif
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static struct videobuf_queue_ops vivi_video_qops = {
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.buf_setup = buffer_setup,
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@ -825,9 +878,9 @@ static struct videobuf_queue_ops vivi_video_qops = {
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.buf_release = buffer_release,
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/* Non-pci handling routines */
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.vb_map_sg = vivi_map_sg,
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.vb_dma_sync_sg = vivi_dma_sync_sg,
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.vb_unmap_sg = vivi_unmap_sg,
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// .vb_map_sg = vivi_map_sg,
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// .vb_dma_sync_sg = vivi_dma_sync_sg,
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// .vb_unmap_sg = vivi_unmap_sg,
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};
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/* ------------------------------------------------------------------
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@ -1205,11 +1258,19 @@ static int vivi_open(struct inode *inode, struct file *file)
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sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
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dev->h,dev->m,dev->s,(dev->us+500)/1000);
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#ifdef CONFIG_VIVI_SCATTER
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videobuf_queue_init(&fh->vb_vidq,VIDEOBUF_DMA_SCATTER, &vivi_video_qops,
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NULL, NULL,
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fh->type,
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V4L2_FIELD_INTERLACED,
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sizeof(struct vivi_buffer),fh);
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#else
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videobuf_queue_init(&fh->vb_vidq, &vivi_video_qops,
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NULL, NULL,
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fh->type,
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V4L2_FIELD_INTERLACED,
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sizeof(struct vivi_buffer),fh);
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#endif
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return 0;
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}
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@ -78,6 +78,9 @@ struct videobuf_dmabuf {
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/* for kernel buffers */
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void *vmalloc;
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/* Stores the userspace pointer to vmalloc area */
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void *varea;
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/* for overlay buffers (pci-pci dma) */
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dma_addr_t bus_addr;
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