From owner-freebsd-arm@freebsd.org Fri Sep 25 20:00:44 2020 Return-Path: Delivered-To: freebsd-arm@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 9FF053E2EC9 for ; Fri, 25 Sep 2020 20:00:44 +0000 (UTC) (envelope-from marklmi@yahoo.com) Received: from sonic315-55.consmr.mail.gq1.yahoo.com (sonic315-55.consmr.mail.gq1.yahoo.com [98.137.65.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4ByjT71kD6z4WCl for ; Fri, 25 Sep 2020 20:00:42 +0000 (UTC) (envelope-from marklmi@yahoo.com) X-YMail-OSG: yPpc3zEVM1n5J6vhPy8hz0cqsrsSJuU1Wpp8fb0cRRhXE9WyEkEapK.qFtsVuxn Do7y5rlJ7LtZv.xfGQdbXUSVqkU6wZY4HP75P__1fKjYhcpuWyHzHPYR1bv7HIjdgc5GxiQZS_wr faftsbuZSrqGPMpnt148oDMeEGWNXDYXPOU8bsTg22Ury8MdwjD8dLSWzqA3TSbpyG0kmeIAyQ.D IgRCisa6VpT73w0ms94nDPP2M.C4doymw9miE7s4jdbCbwOQNTi7ENlpwltKHCTrbj43f630y9im TdfRl_Uu9He_zWcVMnI5JPAgDVPViWhX9GmIhhDLEa0nC8xZG59AkQ8WeiGAbLXou6mvtETtdegi XFL8wSbeQq_YOv5gR7UpzFeX31ipYeuxpBQRoe7UzTi.XIjPM4wLkeycN0QIfxWqpTUT0rFGcSI6 XRp7i6oCx2Gz3UU5u1d0i1Kj2eQLWC3B9c2JMURfaAIYIA2gJq6IDd4uMu_O8Sti_jKSpXIhUec. 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Sep 2020 20:00:44 -0000 On 2020-Sep-19, at 14:49, Robert Crowston = wrote: > . . . >=20 > My question, which may be irrelevant or misguided: The flags field in = the dma tag has an option for specifying if the hardware is cache = coherent (BUS_DMA_COHERENT). Does the UEFI-derived tag passed through to = the xhci driver have this bit set? >=20 > . . . This is answering in a different direction than the prior reply to the overall material: # acpidump -dt | grep -i _CCA Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute Name (_CCA, Zero) // _CCA: Cache Coherency Attribute for a rpi4-uefi-devel v1.20 context. So it appears that code like: if (ACPI_FAILURE(acpi_GetInteger(handle, "_CCA", &coherent))) coherent =3D 0; if (bus_dma_tag_create(NULL, 1, 0, limits.lowaddr, BUS_SPACE_MAXADDR, NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED, = BUS_SPACE_MAXSIZE, coherent ? BUS_DMA_COHERENT : 0, NULL, NULL, result) !=3D 0) return (ENOMEM); will always end up without BUS_DMA_COHERENT as things are currently for uefi/ACPI based RPi4B booting. =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)