多路视频编码同时录制会导致设备死机

[Shine6Z]

• 录制命令

gst-launch-1.0 -e v4l2src device=/dev/video11 io-mode=2 ! 'video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1' ! mpph264enc ! h264parse ! mp4mux ! filesink location=/data/output_11.mp4
gst-launch-1.0 -e v4l2src device=/dev/video10 io-mode=2 ! 'video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1' ! mpph264enc ! h264parse ! mp4mux ! filesink location=/data/output_10.mp4
gst-launch-1.0 -e v4l2src device=/dev/video9 io-mode=2 ! 'video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1' ! mpph264enc ! h264parse ! mp4mux ! filesink location=/data/output_9.mp4
gst-launch-1.0 -e v4l2src device=/dev/video8 io-mode=2 ! 'video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1' ! mpph264enc ! h264parse ! mp4mux ! filesink location=/data/output_8.mp4
gst-launch-1.0 -e v4l2src device=/dev/video3 io-mode=2 ! 'video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1' ! mpph264enc ! h264parse ! mp4mux ! filesink location=/data/output_3.mp4
gst-launch-1.0 -e v4l2src device=/dev/video2 io-mode=2 ! 'video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1' ! mpph264enc ! h264parse ! mp4mux ! filesink location=/data/output_2.mp4
gst-launch-1.0 -e v4l2src device=/dev/video1 io-mode=2 ! 'video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1' ! mpph264enc ! h264parse ! mp4mux ! filesink location=/data/output_1.mp4
gst-launch-1.0 -e v4l2src device=/dev/video0 io-mode=2 ! 'video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1' ! mpph264enc ! h264parse ! mp4mux ! filesink location=/data/output_0.mp4

• 死机前内核崩溃栈

[ 2267.776471] rga: 97433  97442 : RGA_MMU unsupported memory larger than 4G!
[ 2267.776504] rga: 97433  97442 : scheduler core[4] unsupported mm_flag[0x0]!
[ 2267.776516] rga: 97433  97442 : ID[3675]: job buffer map failed!
[ 2267.776525] rga: 97433  97442 : ID[3675]: dst channel map job buffer failed!
[ 2267.776709] rga: 97433  97442 : ID[3675]: failed to map buffer
[ 2267.776721] rga: 97433  97442 : ID[3675]: rga_job_commit: failed to map job info
[ 2267.776799] rga: 97433  97442 : ID[3675]: task[0] job_commit failed.
[ 2267.776810] rga: 97433  97442 : ID[3675]: request commit failed!
[ 2267.776823] ------------[ cut here ]------------
[ 2267.776830] WARNING: CPU: 2 PID: 97442 at kernel/fork.c:790 __mmdrop+0x124/0x160
[ 2267.776849] Modules linked in: bcmdhd(O)
[ 2267.776863] CPU: 2 PID: 97442 Comm: v4l2src0:src Tainted: G           O       6.1.99 #1
[ 2267.776873] Hardware name: CPdevice Mega1 Board (DT)
[ 2267.776880] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 2267.776890] pc : __mmdrop+0x124/0x160
[ 2267.776900] lr : rga_request_put_current_mm.part.0+0x6c/0x7c
[ 2267.776912] sp : ffffffc00d59bae0
[ 2267.776918] x29: ffffffc00d59bae0 x28: ffffff8142085700 x27: 0000000000000000
[ 2267.776933] x26: 0000000000000000 x25: 0000000000000000 x24: ffffff8125988600
[ 2267.776946] x23: ffffff812ae19200 x22: ffffff81078ed088 x21: ffffff810d1d2d80
[ 2267.776960] x20: ffffff810d1d2d80 x19: ffffff810d1d2d80 x18: 0000000000000030
[ 2267.776974] x17: 6c6961662074696d x16: 6d6f632074736575 x15: ffffffffffffffff
[ 2267.776987] x14: 0000000000000000 x13: 2164656c69616620 x12: 74696d6d6f632074
[ 2267.777001] x11: 736575716572203a x10: ffffffc00a7682e8 x9 : ffffffc008897cc0
[ 2267.777014] x8 : ffffffc00a6b82e8 x7 : ffffffc00a7682e8 x6 : 0000000000000000
[ 2267.777028] x5 : 0000000000017ff4 x4 : 0000000000000000 x3 : ffffff81078ed088
[ 2267.777041] x2 : 0000000000000001 x1 : ffffffc00a7be3e0 x0 : ffffff810d1d2d80
[ 2267.777054] Call trace:
[ 2267.777061]  __mmdrop+0x124/0x160
[ 2267.777071]  rga_request_put_current_mm.part.0+0x6c/0x7c
[ 2267.777081]  rga_request_submit+0x434/0x690
[ 2267.777090]  rga_ioctl_blit+0xb8/0x2b0
[ 2267.777101]  rga_ioctl+0x410/0xe8c
[ 2267.777111]  __arm64_sys_ioctl+0xb4/0xdc
[ 2267.777124]  invoke_syscall+0x4c/0x114
[ 2267.777134]  el0_svc_common.constprop.0+0x54/0x180
[ 2267.777144]  do_el0_svc+0x20/0x2c
[ 2267.777154]  el0_svc+0x24/0xa4
[ 2267.777164]  el0t_64_sync_handler+0xb0/0xb4
[ 2267.777173]  el0t_64_sync+0x174/0x178
[ 2267.777183] 
               PC: 0xffffffc008046af4:

[Shine6Z]

RGA要求操作的数据要在4G以下内存空间，但是MPP似乎并未遵守该规则导致在Linux平台调用MPP的应用均面临死机风险
在标准C++开发为GST数据分配了有效内存空间依旧报错，所以问题应该是MPP内部引发的：

    int dma_fd;
    void* dma_va;
    int ret = dma_buf_alloc(DMA_HEAP_DMA32_PATH, size, &dma_fd, &dma_va);
    if (ret < 0) {
        std::cerr << "Failed to allocate DMA buffer" << std::endl;
        return;
    }

    // 将帧数据复制到DMA缓冲区
    memcpy(dma_va, frame_data, size);

    // 创建GstBuffer from DMA buffer
    GstAllocator *allocator = gst_dmabuf_allocator_new();
    if (!allocator) {
        std::cerr << "Failed to create DMA buffer allocator" << std::endl;
        dma_buf_free(size, &dma_fd, dma_va);
        return;
    }

    // 使用正确的API - gst_dmabuf_allocator_alloc只需要3个参数
    GstMemory *mem = gst_dmabuf_allocator_alloc(allocator, dma_fd, size);
    if (!mem) {
        std::cerr << "Failed to create GstMemory from DMA buffer" << std::endl;
        gst_object_unref(allocator);
        dma_buf_free(size, &dma_fd, dma_va);
        return;
    }

    GstBuffer *buffer = gst_buffer_new();
    gst_buffer_append_memory(buffer, mem);
    gst_object_unref(allocator);