From: Jean-Francois Moine Date: Tue, 8 Jul 2008 09:58:15 +0000 (-0300) Subject: V4L/DVB (8232): gspca: Change the USERPTR mechanism. X-Git-Tag: firefly_0821_release~19561^2~129 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ac0d6df69bc72eabda944fd14a958074dc08ca0c;p=firefly-linux-kernel-4.4.55.git V4L/DVB (8232): gspca: Change the USERPTR mechanism. main: Change the packet copy mechanism for userptr. Cannot do reqbufs ioctl when already done and count != 0. Accept count < frame size in read(). Signed-off-by: Jean-Francois Moine Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c index cb0aeb0c0a45..77e5e4f4335b 100644 --- a/drivers/media/video/gspca/gspca.c +++ b/drivers/media/video/gspca/gspca.c @@ -36,15 +36,14 @@ #include "gspca.h" /* global values */ -#define DEF_NURBS 2 /* default number of URBs (mmap) */ -#define USR_NURBS 5 /* default number of URBs (userptr) */ +#define DEF_NURBS 2 /* default number of URBs */ MODULE_AUTHOR("Jean-Francois Moine "); MODULE_DESCRIPTION("GSPCA USB Camera Driver"); MODULE_LICENSE("GPL"); -#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 1, 5) -static const char version[] = "2.1.5"; +#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 1, 6) +static const char version[] = "2.1.6"; static int video_nr = -1; @@ -153,7 +152,6 @@ static void fill_frame(struct gspca_dev *gspca_dev, } /* resubmit the URB */ -/*fixme: don't do that when userptr and too many URBs sent*/ urb->status = 0; st = usb_submit_urb(urb, GFP_ATOMIC); if (st < 0) @@ -163,18 +161,9 @@ static void fill_frame(struct gspca_dev *gspca_dev, /* * ISOC message interrupt from the USB device * - * Analyse each packet and call the subdriver for copy - * to the frame buffer. - * - * There are 2 functions: - * - the first one (isoc_irq_mmap) is used when the application - * buffers are mapped. The frame detection and copy is done - * at interrupt level. - * - the second one (isoc_irq_user) is used when the application - * buffers are in user space (userptr). The frame detection - * and copy is done by the application. + * Analyse each packet and call the subdriver for copy to the frame buffer. */ -static void isoc_irq_mmap(struct urb *urb +static void isoc_irq(struct urb *urb ) { struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context; @@ -185,56 +174,11 @@ static void isoc_irq_mmap(struct urb *urb fill_frame(gspca_dev, urb); } -static void isoc_irq_user(struct urb *urb -) -{ - struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context; - int i; - - PDEBUG(D_PACK, "isoc irq user"); - if (!gspca_dev->streaming) - return; - - i = gspca_dev->urb_in % gspca_dev->nurbs; - if (urb != gspca_dev->urb[i]) { - PDEBUG(D_ERR|D_PACK, "urb out of sequence"); - return; /* should never occur */ - } - - gspca_dev->urb_in++; - atomic_inc(&gspca_dev->nevent); /* new event */ - wake_up_interruptible(&gspca_dev->wq); -/*fixme: submit a new URBs until urb_in == urb_out (% nurbs)*/ -} - -/* - * treat the isoc messages - * - * This routine is called by the application (case userptr). - */ -static void isoc_transfer(struct gspca_dev *gspca_dev) -{ - struct urb *urb; - int i; - - for (;;) { - i = gspca_dev->urb_out; - PDEBUG(D_PACK, "isoc transf i:%d o:%d", gspca_dev->urb_in, i); - if (i == gspca_dev->urb_in) /* isoc message to read */ - break; /* no (more) message */ - atomic_dec(&gspca_dev->nevent); -/*PDEBUG(D_PACK, "isoc_trf nevent: %d", atomic_read(&gspca_dev->nevent));*/ - gspca_dev->urb_out = i + 1; /* message treated */ - urb = gspca_dev->urb[i % gspca_dev->nurbs]; - fill_frame(gspca_dev, urb); - } -} - /* * add data to the current frame * - * This function is called by the subdrivers at interrupt level - * or user level. + * This function is called by the subdrivers at interrupt level. + * * To build a frame, these ones must add * - one FIRST_PACKET * - 0 or many INTER_PACKETs @@ -277,16 +221,7 @@ struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev, frame->v4l2_buf.length); packet_type = DISCARD_PACKET; } else { - if (frame->v4l2_buf.memory != V4L2_MEMORY_USERPTR) { - memcpy(frame->data_end, data, len); - } else { - if (copy_to_user(frame->data_end, - data, len) != 0) { - PDEBUG(D_ERR|D_PACK, - "copy to user failed"); - packet_type = DISCARD_PACKET; - } - } + memcpy(frame->data_end, data, len); frame->data_end += len; } } @@ -333,7 +268,6 @@ static void *rvmalloc(unsigned long size) /* size = PAGE_ALIGN(size); (already done) */ mem = vmalloc_32(size); if (mem != NULL) { - memset(mem, 0, size); adr = (unsigned long) mem; while ((long) size > 0) { SetPageReserved(vmalloc_to_page((void *) adr)); @@ -344,14 +278,12 @@ static void *rvmalloc(unsigned long size) return mem; } -static void rvfree(void *mem, unsigned long size) +static void rvfree(void *mem, long size) { unsigned long adr; - if (!mem) - return; adr = (unsigned long) mem; - while ((long) size > 0) { + while (size > 0) { ClearPageReserved(vmalloc_to_page((void *) adr)); adr += PAGE_SIZE; size -= PAGE_SIZE; @@ -370,16 +302,13 @@ static int frame_alloc(struct gspca_dev *gspca_dev, frsz = gspca_dev->cam.cam_mode[i].sizeimage; PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz); frsz = PAGE_ALIGN(frsz); - PDEBUG(D_STREAM, "new fr_sz: %d", frsz); gspca_dev->frsz = frsz; if (count > GSPCA_MAX_FRAMES) count = GSPCA_MAX_FRAMES; - if (gspca_dev->memory == V4L2_MEMORY_MMAP) { - gspca_dev->frbuf = rvmalloc(frsz * count); - if (!gspca_dev->frbuf) { - err("frame alloc failed"); - return -ENOMEM; - } + gspca_dev->frbuf = rvmalloc(frsz * count); + if (!gspca_dev->frbuf) { + err("frame alloc failed"); + return -ENOMEM; } gspca_dev->nframes = count; for (i = 0; i < count; i++) { @@ -391,11 +320,9 @@ static int frame_alloc(struct gspca_dev *gspca_dev, frame->v4l2_buf.length = frsz; frame->v4l2_buf.memory = gspca_dev->memory; frame->v4l2_buf.sequence = 0; - if (gspca_dev->memory == V4L2_MEMORY_MMAP) { - frame->data = frame->data_end = + frame->data = frame->data_end = gspca_dev->frbuf + i * frsz; - frame->v4l2_buf.m.offset = i * frsz; - } + frame->v4l2_buf.m.offset = i * frsz; } gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0; gspca_dev->last_packet_type = DISCARD_PACKET; @@ -509,7 +436,6 @@ static int create_urbs(struct gspca_dev *gspca_dev, { struct urb *urb; int n, nurbs, i, psize, npkt, bsize; - usb_complete_t usb_complete; /* calculate the packet size and the number of packets */ psize = le16_to_cpu(ep->desc.wMaxPacketSize); @@ -522,14 +448,7 @@ static int create_urbs(struct gspca_dev *gspca_dev, bsize = psize * npkt; PDEBUG(D_STREAM, "isoc %d pkts size %d (bsize:%d)", npkt, psize, bsize); -/*fixme:don't submit all URBs when userptr*/ - if (gspca_dev->memory != V4L2_MEMORY_USERPTR) { - usb_complete = isoc_irq_mmap; - nurbs = DEF_NURBS; - } else { - usb_complete = isoc_irq_user; - nurbs = USR_NURBS; - } + nurbs = DEF_NURBS; gspca_dev->nurbs = nurbs; for (n = 0; n < nurbs; n++) { urb = usb_alloc_urb(npkt, GFP_KERNEL); @@ -556,7 +475,7 @@ static int create_urbs(struct gspca_dev *gspca_dev, urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; urb->interval = ep->desc.bInterval; - urb->complete = usb_complete; + urb->complete = isoc_irq; urb->number_of_packets = npkt; urb->transfer_buffer_length = bsize; for (i = 0; i < npkt; i++) { @@ -564,7 +483,6 @@ static int create_urbs(struct gspca_dev *gspca_dev, urb->iso_frame_desc[i].offset = psize * i; } } - gspca_dev->urb_in = gspca_dev->urb_out = 0; return 0; } @@ -1063,6 +981,7 @@ static int vidioc_reqbufs(struct file *file, void *priv, if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; switch (rb->memory) { + case GSPCA_MEMORY_READ: case V4L2_MEMORY_MMAP: case V4L2_MEMORY_USERPTR: break; @@ -1072,13 +991,6 @@ static int vidioc_reqbufs(struct file *file, void *priv, if (mutex_lock_interruptible(&gspca_dev->queue_lock)) return -ERESTARTSYS; - for (i = 0; i < gspca_dev->nframes; i++) { - if (gspca_dev->frame[i].vma_use_count) { - ret = -EBUSY; - goto out; - } - } - /* only one file may do capture */ if ((gspca_dev->capt_file != NULL && gspca_dev->capt_file != file) || gspca_dev->streaming) { @@ -1086,10 +998,20 @@ static int vidioc_reqbufs(struct file *file, void *priv, goto out; } - if (rb->count == 0) { /* unrequest? */ + if (rb->count == 0) { /* unrequest */ + for (i = 0; i < gspca_dev->nframes; i++) { + if (gspca_dev->frame[i].vma_use_count) { + ret = -EBUSY; + goto out; + } + } frame_free(gspca_dev); gspca_dev->capt_file = NULL; } else { + if (gspca_dev->nframes != 0) { + ret = -EBUSY; + goto out; + } gspca_dev->memory = rb->memory; ret = frame_alloc(gspca_dev, rb->count); if (ret == 0) { @@ -1301,9 +1223,6 @@ static int dev_mmap(struct file *file, struct vm_area_struct *vma) struct page *page; unsigned long addr, start, size; int i, ret; -#ifdef CONFIG_VIDEO_V4L1_COMPAT - int compat = 0; -#endif start = vma->vm_start; size = vma->vm_end - vma->vm_start; @@ -1338,11 +1257,11 @@ static int dev_mmap(struct file *file, struct vm_area_struct *vma) goto out; } #ifdef CONFIG_VIDEO_V4L1_COMPAT - if (i == 0 && size == frame->v4l2_buf.length * gspca_dev->nframes) - compat = 1; - else + /* v4l1 maps all the buffers */ + if (i != 0 + || size != frame->v4l2_buf.length * gspca_dev->nframes) #endif - if (size != frame->v4l2_buf.length) { + if (size != frame->v4l2_buf.length) { PDEBUG(D_STREAM, "mmap bad size"); ret = -EINVAL; goto out; @@ -1368,14 +1287,6 @@ static int dev_mmap(struct file *file, struct vm_area_struct *vma) vma->vm_ops = &gspca_vm_ops; vma->vm_private_data = frame; gspca_vm_open(vma); -#ifdef CONFIG_VIDEO_V4L1_COMPAT - if (compat) { -/*fixme: ugly*/ - for (i = 1; i < gspca_dev->nframes; ++i) - gspca_dev->frame[i].v4l2_buf.flags |= - V4L2_BUF_FLAG_MAPPED; - } -#endif ret = 0; out: mutex_unlock(&gspca_dev->queue_lock); @@ -1393,10 +1304,6 @@ static int frame_wait(struct gspca_dev *gspca_dev, struct gspca_frame *frame; int i, j, ret; - /* if userptr, treat the awaiting URBs */ - if (gspca_dev->memory == V4L2_MEMORY_USERPTR) - isoc_transfer(gspca_dev); - /* check if a frame is ready */ i = gspca_dev->fr_o; j = gspca_dev->fr_queue[i]; @@ -1421,8 +1328,6 @@ static int frame_wait(struct gspca_dev *gspca_dev, atomic_dec(&gspca_dev->nevent); if (!gspca_dev->streaming || !gspca_dev->present) return -EIO; - if (gspca_dev->memory == V4L2_MEMORY_USERPTR) - isoc_transfer(gspca_dev); i = gspca_dev->fr_o; j = gspca_dev->fr_queue[i]; frame = &gspca_dev->frame[j]; @@ -1455,9 +1360,9 @@ static int vidioc_dqbuf(struct file *file, void *priv, int i, ret; PDEBUG(D_FRAM, "dqbuf"); - if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE - || (v4l2_buf->memory != V4L2_MEMORY_MMAP - && v4l2_buf->memory != V4L2_MEMORY_USERPTR)) + if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + if (v4l2_buf->memory != gspca_dev->memory) return -EINVAL; if (!gspca_dev->streaming) return -EINVAL; @@ -1475,6 +1380,16 @@ static int vidioc_dqbuf(struct file *file, void *priv, goto out; i = ret; /* frame index */ frame = &gspca_dev->frame[i]; + if (gspca_dev->memory == V4L2_MEMORY_USERPTR) { + if (copy_to_user((__u8 *) frame->v4l2_buf.m.userptr, + frame->data, + frame->v4l2_buf.bytesused)) { + PDEBUG(D_ERR|D_STREAM, + "dqbuf cp to user failed"); + ret = -EFAULT; + goto out; + } + } frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf); PDEBUG(D_FRAM, "dqbuf %d", i); @@ -1529,8 +1444,6 @@ static int vidioc_qbuf(struct file *file, void *priv, /* frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */ if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) { - frame->data = frame->data_end = - (__u8 *) v4l2_buf->m.userptr; frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr; frame->v4l2_buf.length = v4l2_buf->length; } @@ -1568,7 +1481,7 @@ static int read_alloc(struct gspca_dev *gspca_dev, memset(&rb, 0, sizeof rb); rb.count = gspca_dev->nbufread; rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - rb.memory = V4L2_MEMORY_MMAP; + rb.memory = GSPCA_MEMORY_READ; ret = vidioc_reqbufs(file, gspca_dev, &rb); if (ret != 0) { PDEBUG(D_STREAM, "read reqbuf err %d", ret); @@ -1576,7 +1489,7 @@ static int read_alloc(struct gspca_dev *gspca_dev, } memset(&v4l2_buf, 0, sizeof v4l2_buf); v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - v4l2_buf.memory = V4L2_MEMORY_MMAP; + v4l2_buf.memory = GSPCA_MEMORY_READ; for (i = 0; i < gspca_dev->nbufread; i++) { v4l2_buf.index = i; /*fixme: ugly!*/ @@ -1629,11 +1542,6 @@ static unsigned int dev_poll(struct file *file, poll_table *wait) goto out; } - /* if userptr, treat the awaiting URBs */ - if (gspca_dev->memory == V4L2_MEMORY_USERPTR - && gspca_dev->capt_file == file) - isoc_transfer(gspca_dev); - i = gspca_dev->fr_o; i = gspca_dev->fr_queue[i]; if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE) @@ -1678,7 +1586,7 @@ static ssize_t dev_read(struct file *file, char __user *data, for (;;) { memset(&v4l2_buf, 0, sizeof v4l2_buf); v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - v4l2_buf.memory = V4L2_MEMORY_MMAP; + v4l2_buf.memory = GSPCA_MEMORY_READ; ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf); if (ret != 0) { PDEBUG(D_STREAM, "read dqbuf err %d", ret); @@ -1700,14 +1608,8 @@ static ssize_t dev_read(struct file *file, char __user *data, } /* copy the frame */ - if (count < frame->v4l2_buf.bytesused) { - PDEBUG(D_STREAM, "read bad count: %d < %d", - count, frame->v4l2_buf.bytesused); -/*fixme: special errno?*/ - ret = -EINVAL; - goto out; - } - count = frame->v4l2_buf.bytesused; + if (count > frame->v4l2_buf.bytesused) + count = frame->v4l2_buf.bytesused; ret = copy_to_user(data, frame->data, count); if (ret != 0) { PDEBUG(D_ERR|D_STREAM, diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h index 945f1ab4c9eb..9b645af81a07 100644 --- a/drivers/media/video/gspca/gspca.h +++ b/drivers/media/video/gspca/gspca.h @@ -156,8 +156,6 @@ struct gspca_dev { char nbufread; /* number of buffers for read() */ char nurbs; /* number of allocated URBs */ char memory; /* memory type (V4L2_MEMORY_xxx) */ - __u8 urb_in; /* URB pointers - used when !mmap */ - __u8 urb_out; __u8 nbalt; /* number of USB alternate settings */ };