Date: Thu, 19 Oct 2023 11:07:33 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-arm@FreeBSD.org Subject: [Bug 274592] bus_dmamem_alloc()/bus_dmamap_load returns physical address outside the tag low/high bounds Message-ID: <bug-274592-7@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D274592 Bug ID: 274592 Summary: bus_dmamem_alloc()/bus_dmamap_load returns physical address outside the tag low/high bounds Product: Base System Version: 15.0-CURRENT Hardware: arm64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: arm Assignee: freebsd-arm@FreeBSD.org Reporter: shafaisal.us@gmail.com Hello Team,=20 We are using the below 3 routines to alloc DMA memory for one of our devices connected through PCIe interface. Out of 10 rebooted 4-5 times we get the address outside greated 32G range of addresses, due to which our device functionality is effected and there is a crash seen. error =3D bus_dma_tag_create(bus_get_dma_tag(dev), PAGE_SIZE, 0, BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL, 128*1024*1024, 1, 128*1024*1024, BUS_DMA_COHERENT, NULL, NULL, &dma_tag); error =3D bus_dmamem_alloc(dma_tag, &vaddr, BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_COHERE= NT, &dma_map); error =3D bus_dmamap_load(dma_tag, dma_map, vaddr, 128*1024*1024, dma_mem_callback,=20 &dma_paddr, BUS_DMA_NOWAIT);=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Below are the addresses we get for Working and non-working case Working case vaddr and dma_paddr: DMA phys addr with arm64_address_translate is 0xff000000cf000b80 for vaddr 0xffff00007ec00000 DMA phys addr with vtophys is 0xcf000000 for vaddr 0xffff00007ec00000 Non-Working case vaddr and dma_paddr: DMA phys addr with arm64_address_translate is 0xff00000163000b80 for vaddr 0xffff00007ec00000 DMA phys addr with vtophys is 0x163000000 for vaddr 0xffff00007ec00000 --=20 You are receiving this mail because: You are the assignee for the bug.=
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