Re: [PATCH] vb2: replace VIDEO_MAX_FRAME with VB2_MAX_FRAME

Hans Verkuil Sat, 11 Oct 2014 13:46:39 -0700

Hi Laurent,

On 10/11/2014 07:21 PM, Laurent Pinchart wrote:

Hi Hans,


On Friday 10 October 2014 10:04:58 Hans Verkuil wrote:

(This patch is from Divneil except for the vivid changes which I added. He
had difficulties posting the patch without the mailer mangling it, so I'm
reposting it for him)

- vb2 drivers to rely on VB2_MAX_FRAME.

- VB2_MAX_FRAME bumps the value to 64 from current 32


Just curious, in which use case(s) is 32 frames too little ?


See http://www.spinics.net/lists/linux-media/msg76316.html.


By the way, should we discuss at some point a way to remove that limitation
and manage buffers fully dynamically ? That's something we would need for a
VIDIOC_DELETE_BUFS ioctl.


It would be sufficient for this if the driver can pass on how many buffers
should be allocated, rather than it being a vb2 hardcoded size. It's not a
real issue yet, but the next time we need to increase, then we certainly
need to go for a better solution.

Regards,

        Hans

Signed-off-by: Divneil Wadhawan <divneil.wadha...@st.com>
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
   drivers/media/pci/saa7134/saa7134-ts.c       | 4 ++--
   drivers/media/pci/saa7134/saa7134-vbi.c      | 4 ++--
   drivers/media/pci/saa7134/saa7134-video.c    | 2 +-
   drivers/media/platform/mem2mem_testdev.c     | 2 +-
   drivers/media/platform/ti-vpe/vpe.c          | 2 +-
   drivers/media/platform/vivid/vivid-core.h    | 2 +-
   drivers/media/platform/vivid/vivid-ctrls.c   | 2 +-
   drivers/media/platform/vivid/vivid-vid-cap.c | 2 +-
   drivers/media/v4l2-core/videobuf2-core.c     | 8 ++++----
   include/media/videobuf2-core.h               | 4 +++-
   10 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/media/pci/saa7134/saa7134-ts.c
b/drivers/media/pci/saa7134/saa7134-ts.c index bd25323..0d04995 100644
--- a/drivers/media/pci/saa7134/saa7134-ts.c
+++ b/drivers/media/pci/saa7134/saa7134-ts.c
@@ -227,8 +227,8 @@ int saa7134_ts_init1(struct saa7134_dev *dev)
        /* sanitycheck insmod options */
        if (tsbufs < 2)
                tsbufs = 2;
-       if (tsbufs > VIDEO_MAX_FRAME)
-               tsbufs = VIDEO_MAX_FRAME;
+       if (tsbufs > VB2_MAX_FRAME)
+               tsbufs = VB2_MAX_FRAME;
        if (ts_nr_packets < 4)
                ts_nr_packets = 4;
        if (ts_nr_packets > 312)
diff --git a/drivers/media/pci/saa7134/saa7134-vbi.c
b/drivers/media/pci/saa7134/saa7134-vbi.c index 4f0b101..2269837 100644
--- a/drivers/media/pci/saa7134/saa7134-vbi.c
+++ b/drivers/media/pci/saa7134/saa7134-vbi.c
@@ -203,8 +203,8 @@ int saa7134_vbi_init1(struct saa7134_dev *dev)

        if (vbibufs < 2)
                vbibufs = 2;
-       if (vbibufs > VIDEO_MAX_FRAME)
-               vbibufs = VIDEO_MAX_FRAME;
+       if (vbibufs > VB2_MAX_FRAME)
+               vbibufs = VB2_MAX_FRAME;
        return 0;
   }

diff --git a/drivers/media/pci/saa7134/saa7134-video.c
b/drivers/media/pci/saa7134/saa7134-video.c index fc4a427..c7f39be 100644
--- a/drivers/media/pci/saa7134/saa7134-video.c
+++ b/drivers/media/pci/saa7134/saa7134-video.c
@@ -2030,7 +2030,7 @@ int saa7134_video_init1(struct saa7134_dev *dev)
        int ret;

        /* sanitycheck insmod options */
-       if (gbuffers < 2 || gbuffers > VIDEO_MAX_FRAME)
+       if (gbuffers < 2 || gbuffers > VB2_MAX_FRAME)
                gbuffers = 2;
        if (gbufsize > gbufsize_max)
                gbufsize = gbufsize_max;
diff --git a/drivers/media/platform/mem2mem_testdev.c
b/drivers/media/platform/mem2mem_testdev.c index c1b03cf..e1ff7e0 100644
--- a/drivers/media/platform/mem2mem_testdev.c
+++ b/drivers/media/platform/mem2mem_testdev.c
@@ -55,7 +55,7 @@ MODULE_PARM_DESC(debug, "activates debug info");
   #define MEM2MEM_NAME         "m2m-testdev"

   /* Per queue */
-#define MEM2MEM_DEF_NUM_BUFS   VIDEO_MAX_FRAME
+#define MEM2MEM_DEF_NUM_BUFS   VB2_MAX_FRAME
   /* In bytes, per queue */
   #define MEM2MEM_VID_MEM_LIMIT        (16 * 1024 * 1024)

diff --git a/drivers/media/platform/ti-vpe/vpe.c
b/drivers/media/platform/ti-vpe/vpe.c index 9a081c2..04e37c0 100644
--- a/drivers/media/platform/ti-vpe/vpe.c
+++ b/drivers/media/platform/ti-vpe/vpe.c
@@ -1971,7 +1971,7 @@ static const struct v4l2_ctrl_config vpe_bufs_per_job
= { .type = V4L2_CTRL_TYPE_INTEGER,
        .def = VPE_DEF_BUFS_PER_JOB,
        .min = 1,
-       .max = VIDEO_MAX_FRAME,
+       .max = VB2_MAX_FRAME,
        .step = 1,
   };

diff --git a/drivers/media/platform/vivid/vivid-core.h
b/drivers/media/platform/vivid/vivid-core.h index 811c286..c0375a1 100644
--- a/drivers/media/platform/vivid/vivid-core.h
+++ b/drivers/media/platform/vivid/vivid-core.h
@@ -346,7 +346,7 @@ struct vivid_dev {
        /* video capture */
        struct tpg_data                 tpg;
        unsigned                        ms_vid_cap;
-       bool                            must_blank[VIDEO_MAX_FRAME];
+       bool                            must_blank[VB2_MAX_FRAME];

        const struct vivid_fmt          *fmt_cap;
        struct v4l2_fract               timeperframe_vid_cap;
diff --git a/drivers/media/platform/vivid/vivid-ctrls.c
b/drivers/media/platform/vivid/vivid-ctrls.c index d5cbf00..7162f97 100644
--- a/drivers/media/platform/vivid/vivid-ctrls.c
+++ b/drivers/media/platform/vivid/vivid-ctrls.c
@@ -332,7 +332,7 @@ static int vivid_vid_cap_s_ctrl(struct v4l2_ctrl *ctrl)
                break;
        case VIVID_CID_PERCENTAGE_FILL:
                tpg_s_perc_fill(&dev->tpg, ctrl->val);
-               for (i = 0; i < VIDEO_MAX_FRAME; i++)
+               for (i = 0; i < VB2_MAX_FRAME; i++)
                        dev->must_blank[i] = ctrl->val < 100;
                break;
        case VIVID_CID_INSERT_SAV:
diff --git a/drivers/media/platform/vivid/vivid-vid-cap.c
b/drivers/media/platform/vivid/vivid-vid-cap.c index 331c544..55e8158
100644
--- a/drivers/media/platform/vivid/vivid-vid-cap.c
+++ b/drivers/media/platform/vivid/vivid-vid-cap.c
@@ -252,7 +252,7 @@ static int vid_cap_start_streaming(struct vb2_queue *vq,
unsigned count)

        dev->vid_cap_seq_count = 0;
        dprintk(dev, 1, "%s\n", __func__);
-       for (i = 0; i < VIDEO_MAX_FRAME; i++)
+       for (i = 0; i < VB2_MAX_FRAME; i++)
                dev->must_blank[i] = tpg_g_perc_fill(&dev->tpg) < 100;
        if (dev->start_streaming_error) {
                dev->start_streaming_error = false;
diff --git a/drivers/media/v4l2-core/videobuf2-core.c
b/drivers/media/v4l2-core/videobuf2-core.c index 15b02f9..60354b4 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -911,7 +911,7 @@ static int __reqbufs(struct vb2_queue *q, struct
v4l2_requestbuffers *req) /*
         * Make sure the requested values and current defaults are sane.
         */
-       num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME);
+       num_buffers = min_t(unsigned int, req->count, VB2_MAX_FRAME);
        num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed);
        memset(q->plane_sizes, 0, sizeof(q->plane_sizes));
        memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx));
@@ -1015,7 +1015,7 @@ static int __create_bufs(struct vb2_queue *q, struct
v4l2_create_buffers *create unsigned int num_planes = 0, num_buffers,
allocated_buffers;
        int ret;

-       if (q->num_buffers == VIDEO_MAX_FRAME) {
+       if (q->num_buffers == VB2_MAX_FRAME) {
                dprintk(1, "maximum number of buffers already allocated\n");
                return -ENOBUFS;
        }
@@ -1026,7 +1026,7 @@ static int __create_bufs(struct vb2_queue *q, struct
v4l2_create_buffers *create q->memory = create->memory;
        }

-       num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers);
+       num_buffers = min(create->count, VB2_MAX_FRAME - q->num_buffers);

        /*
         * Ask the driver, whether the requested number of buffers, planes per
@@ -2725,7 +2725,7 @@ struct vb2_fileio_data {
        struct v4l2_requestbuffers req;
        struct v4l2_plane p;
        struct v4l2_buffer b;
-       struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME];
+       struct vb2_fileio_buf bufs[VB2_MAX_FRAME];
        unsigned int cur_index;
        unsigned int initial_index;
        unsigned int q_count;
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index a8608ce..66dcc40 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -18,6 +18,8 @@
   #include <linux/videodev2.h>
   #include <linux/dma-buf.h>

+#define VB2_MAX_FRAME          64
+
   struct vb2_alloc_ctx;
   struct vb2_fileio_data;
   struct vb2_threadio_data;
@@ -402,7 +404,7 @@ struct vb2_queue {
   /* private: internal use only */
        struct mutex                    mmap_lock;
        enum v4l2_memory                memory;
-       struct vb2_buffer               *bufs[VIDEO_MAX_FRAME];
+       struct vb2_buffer               *bufs[VB2_MAX_FRAME];
        unsigned int                    num_buffers;

        struct list_head                queued_list;

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Re: [PATCH] vb2: replace VIDEO_MAX_FRAME with VB2_MAX_FRAME

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