Dear Hsin-Yi,
because this Warning is occured with config CONFIG_DMA_API_DEBUG_SG=y,
how about add these modifications with this configuration as well?
On Fri, 2020-08-21 at 12:14 +0800, Hsin-Yi Wang wrote:
> Set dma max segment size for encoder and decoder driver.
>
> Fix following warning with CONFIG_DMA_API_DEBUG_SG=y
>
> [ 75.147825] ------------[ cut here ]------------
> [ 75.147844] mtk-vcodec-enc 19002000.vcodec: DMA-API: mapping sg segment longer than device claims to support [len=983040] [max=65536]
> [ 75.147876] WARNING: CPU: 2 PID: 4069 at kernel/dma/debug.c:1302 debug_dma_map_sg+0x1a8/0x2c4
> ...
> [ 75.148139] Call trace:
> [ 75.148149] debug_dma_map_sg+0x1a8/0x2c4
> [ 75.148165] vb2_dc_get_userptr+0x228/0x364 [videobuf2_dma_contig]
> [ 75.148178] __buf_prepare+0x3ac/0x8c0 [videobuf2_common]
> [ 75.148188] vb2_core_qbuf+0xa4/0x58c [videobuf2_common]
> [ 75.148199] vb2_qbuf+0x88/0xe4 [videobuf2_v4l2]
> [ 75.148211] v4l2_m2m_qbuf+0x80/0xf8 [v4l2_mem2mem]
> [ 75.148221] vidioc_venc_qbuf+0x3c/0x70 [mtk_vcodec_enc]
> [ 75.148234] v4l_qbuf+0x48/0x58
> [ 75.148242] __video_do_ioctl+0x200/0x37c
> [ 75.148250] video_usercopy+0x360/0x834
> [ 75.148259] video_ioctl2+0x38/0x48
> [ 75.148267] v4l2_ioctl+0x6c/0x80
> [ 75.148276] do_video_ioctl+0xefc/0x4b70
> [ 75.148284] v4l2_compat_ioctl32+0x5c/0xcc
> [ 75.148294] __arm64_compat_sys_ioctl+0xf4/0x240
> [ 75.148304] el0_svc_common+0xac/0x198
> [ 75.148312] el0_svc_compat_handler+0x2c/0x40
> [ 75.148321] el0_svc_compat+0x8/0x18
> [ 75.148328] irq event stamp: 0
> [ 75.148337] hardirqs last enabled at (0): [<0000000000000000>] (null)
> [ 75.148347] hardirqs last disabled at (0): [<ffffff90080e65c0>] copy_process+0x380/0x115c
> [ 75.148356] softirqs last enabled at (0): [<ffffff90080e65d8>] copy_process+0x398/0x115c
> [ 75.148364] softirqs last disabled at (0): [<0000000000000000>] (null)
> [ 75.148372] ---[ end trace 588bf529451e3531 ]---
>
> Reported-by: Anand K Mistry <amistry@xxxxxxxxxxxx>
> Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
> ---
> drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c | 8 ++++++++
> drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c | 8 ++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> index 97a1b6664c20..3bbd0bac56d6 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> @@ -242,6 +242,14 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
> mtk_v4l2_err("[VPU] vpu device in not ready");
> return -EPROBE_DEFER;
> }
> + if (!pdev->dev.dma_parms) {
> + pdev->dev.dma_parms = devm_kzalloc(&pdev->dev,
> + sizeof(*pdev->dev.dma_parms),
> + GFP_KERNEL);
> + if (!pdev->dev.dma_parms)
> + return -ENOMEM;
> + }
> + dma_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
>
> vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_dec_reset_handler,
> dev, VPU_RST_DEC);
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> index 4d31f1ed113f..ff4a87485d69 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> @@ -249,6 +249,14 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
> mtk_v4l2_err("[VPU] vpu device in not ready");
> return -EPROBE_DEFER;
> }
> + if (!pdev->dev.dma_parms) {
> + pdev->dev.dma_parms = devm_kzalloc(&pdev->dev,
> + sizeof(*pdev->dev.dma_parms),
> + GFP_KERNEL);
> + if (!pdev->dev.dma_parms)
> + return -ENOMEM;
> + }
> + dma_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
>
> vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_enc_reset_handler,
> dev, VPU_RST_ENC);
