Hi all, The most relevant change for this round is that all the work done in the fence callback is now moved to a workqueue, that runs with the queue lock held. Although this introduces some latency, it is however needed to take the vb2_queue mutex and safely call vb2 ops. Given the fence callback can be called fully asynchronously, and given it needs to be associated with a vb2_buffer, we now need to refcount vb2_buffer. This allows to safely "attach" the vb2_buffer to the fence callback. To prevent annoying deadlocks, and because the fence callback is called with the fence spinlock, it's best to avoid calling dma_fence_put in the fence callback itself. So the fence is now put in the DQBUF operation (or in cancel paths). Hopefully, I took care of all the feedback provided by Hans and Brian on v9. Please let me know if you guys catch anything else. Thanks! Changes from v9: * Move fence callback to workqueue, and call vb2_start_streaming if needed. * Refcount vb2_buffer. * Check return of get_unused_fd. * Increase seqno for out-fences that reuse the context. * Go back to is_unordered callback. * Mark unordered formats in cobalt driver. * Improve CAP_FENCES check. * Minor documentation changes. Ezequiel Garcia (1): videobuf2: Make struct vb2_buffer refcounted Gustavo Padovan (15): xilinx: regroup caps on querycap hackrf: group device capabilities omap3isp: group device capabilities vb2: move vb2_ops functions to videobuf2-core.[ch] vb2: add is_unordered callback for drivers v4l: add unordered flag to format description ioctl v4l: mark unordered formats cobalt: add .is_unordered() for cobalt vb2: mark codec drivers as unordered vb2: add explicit fence user API vb2: add in-fence support to QBUF vb2: add out-fence support to QBUF v4l: introduce the fences capability v4l: Add V4L2_CAP_FENCES to drivers v4l: Document explicit synchronization behavior Documentation/media/uapi/v4l/buffer.rst | 48 ++- Documentation/media/uapi/v4l/vidioc-enum-fmt.rst | 7 + Documentation/media/uapi/v4l/vidioc-qbuf.rst | 53 ++- Documentation/media/uapi/v4l/vidioc-querybuf.rst | 12 +- Documentation/media/uapi/v4l/vidioc-querycap.rst | 3 + drivers/media/common/videobuf2/Kconfig | 1 + drivers/media/common/videobuf2/videobuf2-core.c | 376 ++++++++++++++++++--- drivers/media/common/videobuf2/videobuf2-v4l2.c | 65 +++- drivers/media/dvb-core/dvb_vb2.c | 2 +- drivers/media/pci/cobalt/cobalt-v4l2.c | 4 + drivers/media/platform/coda/coda-common.c | 1 + drivers/media/platform/exynos-gsc/gsc-m2m.c | 3 +- drivers/media/platform/m2m-deinterlace.c | 3 +- drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c | 3 +- drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c | 1 + .../media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c | 2 +- drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c | 1 + .../media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c | 3 +- drivers/media/platform/mx2_emmaprp.c | 3 +- drivers/media/platform/omap3isp/ispvideo.c | 10 +- drivers/media/platform/qcom/venus/vdec.c | 4 +- drivers/media/platform/qcom/venus/venc.c | 4 +- drivers/media/platform/s5p-mfc/s5p_mfc_dec.c | 1 + drivers/media/platform/s5p-mfc/s5p_mfc_enc.c | 1 + drivers/media/platform/sh_veu.c | 3 +- drivers/media/platform/xilinx/xilinx-dma.c | 10 +- drivers/media/usb/hackrf/hackrf.c | 11 +- drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 4 +- drivers/media/v4l2-core/v4l2-ioctl.c | 98 +++++- include/media/videobuf2-core.h | 76 ++++- include/media/videobuf2-v4l2.h | 18 - include/uapi/linux/videodev2.h | 10 +- 32 files changed, 708 insertions(+), 133 deletions(-) -- 2.16.3
