merged. Bruce
In message: [linux-yocto][linux-yocto v6.12/standard/bcm-2xxx-rpi & v6.12/standard/preempt-rt/bcm-2xxx-rpi][PATCH] Drivers: IOMMU: set the IOMMU sg limitation segment on 13/11/2025 Xiaolei Wang wrote: > the kernel occasionally reports a segment size mismatch. > This is because 'max_seg_size' is not set. The kernel > defaults to 64K. Based on IOMMU addressing capabilities, > setting 'max_seg_size' to the maximum will prevent > 'debug_dma_map_sg()' from complaining about the over-mapping > of the IOMMU segment length. > > DMA-API: bcm2712-iommu 1000005100.iommu: mapping sg segment longer than > device claims to support [len=2105344] [max=65536] > WARNING: CPU: 0 PID: 59 at /kernel/dma/debug.c:1178 > check_sg_segment+0x190/0x200 > Modules linked in: > CPU: 0 UID: 0 PID: 59 Comm: kworker/u16:1 Tainted: G W > 6.12.55-rt6-yocto-preempt-rt #1 > Call trace: > check_sg_segment+0x190/0x200 > debug_dma_map_sg+0x13c/0x1b0 > dma_alloc_noncontiguous+0x98/0x118 > bcm2712_iommu_probe+0x15c/0x320 > platform_probe+0x70/0xe8 > > Signed-off-by: Xiaolei Wang <[email protected]> > --- > drivers/iommu/bcm2712-iommu.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/iommu/bcm2712-iommu.c b/drivers/iommu/bcm2712-iommu.c > index 4e6aa0352f5a..a9ae51d593ca 100644 > --- a/drivers/iommu/bcm2712-iommu.c > +++ b/drivers/iommu/bcm2712-iommu.c > @@ -607,6 +607,7 @@ static int bcm2712_iommu_probe(struct platform_device > *pdev) > */ > ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(36)); > WARN_ON(ret); > + dma_set_max_seg_size(&pdev->dev, UINT_MAX); > mmu->sgt = dma_alloc_noncontiguous(&pdev->dev, TABLES_ALLOC_SIZE, > DMA_TO_DEVICE, GFP_KERNEL, > DMA_ATTR_ALLOC_SINGLE_PAGES); > -- > 2.43.0 >
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