From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D298ACAC5B8 for ; Sun, 5 Oct 2025 14:32:23 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4cflGt2d2Nz3cDN; Mon, 6 Oct 2025 01:32:22 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2604:f440:8:8::2" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1759674742; cv=none; b=WqG3ccjk4YErENbJMi1lIz4pMguEYtcVyAA68gCsi04wt81fADFPTF9OtZ30NyNwmxgDpNExkp+sIgppoLzpipOW7t1vLXkOH9vaNthg9Uq74U6d8SNP6BPbupP1vvzxcjq3HcV9YcnxC3iN5xW1lhoZ3KexM34DI7bOpcQU4UnDdxJ12jZuZQLhtMegK5vVf+ggPzky1v0iH5KznbyBoCHuf035A4An94IYEoK181mLq6d/5MqAHbjMic3WDHmPDZkEWbdjQjaxGYHyNaIFsOKr69KE8vI1qu1IdSlY4qf5aKu+BSfKGbA8x0zYwjQsEJCzNZlin7eWEyDOPCWD3Q== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1759674742; c=relaxed/relaxed; bh=3zvbBGGUPbtrhxdquNh9U133x3leWCTDaD1EW1tXO3k=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=GO6iowdED9iy4KMETEAytj63DXWhgHl6m4wkAS59PPa5duF4DkQLeiNLxO8u3QUbXqNHI35Tpf5NDPslpvzpNX8RSFnvRQ3SjL8dDRkudCpscbtfKTUHYg0fl1wAnIL2C3DkPWzDahTy4TEyvk3MKfjhQAVuctwlcrd/hEP46MCrLUrl5qAmSOtTGjmLYtRQPMnr8YMkPhO15w4eW2T6C7qooH8h/D+EPc0Go99je1SHritTp2T/xpzAoo66/hvZgujVzbBEjxH+GkRPYZuy1MHTbRkFblw6JNRwpgkzekLT2lcL1yIo0eenDK30MXNucIdociyB0WGNdgMLNVeiOA== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; dkim=pass (1024-bit key; secure) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.a=rsa-sha256 header.s=20151216 header.b=dCWCKQas; dkim-atps=neutral; spf=pass (client-ip=2604:f440:8:8::2; helo=lamorak.hansenpartnership.com; envelope-from=james.bottomley@hansenpartnership.com; receiver=lists.ozlabs.org) smtp.mailfrom=hansenpartnership.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.a=rsa-sha256 header.s=20151216 header.b=dCWCKQas; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=hansenpartnership.com (client-ip=2604:f440:8:8::2; helo=lamorak.hansenpartnership.com; envelope-from=james.bottomley@hansenpartnership.com; receiver=lists.ozlabs.org) Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [IPv6:2604:f440:8:8::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4cflGs0Ykkz30M0 for ; Mon, 6 Oct 2025 01:32:20 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1759674176; bh=h8/0VfnLYGz2U7csWzqwHZseTDljgEdp48luuBTRQD0=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=dCWCKQasDDmqK86YFHFQ06W4cUGxZdmuJQrtlZTwnNAcPEgK5AX1S/RG1yah/ME4B 4ebSHYdCfn1lQa6cKNMnNG7E7Uhi4QcETyWOUnWc05NIdbLWDBSKArRXntDtwJ5mol DZoaJC/udVyI3wt1O8PjwADf3RJ8EaBAdgp2DZZM= Received: from lingrow.int.hansenpartnership.com (unknown [IPv6:2601:5c4:4302:c21::a774]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lamorak.hansenpartnership.com (Postfix) with ESMTPSA id 33EB71C0014; Sun, 05 Oct 2025 10:22:55 -0400 (EDT) Message-ID: Subject: Re: [PATCH v1 3/9] parisc: Convert DMA map_page to map_phys interface From: James Bottomley To: Jason Gunthorpe , Leon Romanovsky Cc: Marek Szyprowski , Leon Romanovsky , Andreas Larsson , Borislav Petkov , Dave Hansen , "David S. Miller" , Geoff Levand , Helge Deller , Ingo Molnar , iommu@lists.linux.dev, Jason Wang , Juergen Gross , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Madhavan Srinivasan , Matt Turner , Michael Ellerman , "Michael S. Tsirkin" , Richard Henderson , sparclinux@vger.kernel.org, Stefano Stabellini , Thomas Bogendoerfer , Thomas Gleixner , virtualization@lists.linux.dev, x86@kernel.org, xen-devel@lists.xenproject.org, Magnus Lindholm Date: Sun, 05 Oct 2025 10:22:54 -0400 In-Reply-To: <20251003150144.GC3360665@nvidia.com> References: <333ec4dabec16d3d913a93780bc6e7ddb5240fcf.1759071169.git.leon@kernel.org> <20251003150144.GC3360665@nvidia.com> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; 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 8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 On Fri, 2025-10-03 at 12:01 -0300, Jason Gunthorpe wrote: > On Sun, Sep 28, 2025 at 06:02:23PM +0300, Leon Romanovsky wrote: > > +ccio_map_phys(struct device *dev, phys_addr_t phys, size_t size, > > + =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 enum dma_data_direction direction, uns= igned long > > attrs) > > =C2=A0{ > > - return ccio_map_single(dev, page_address(page) + offset, > > size, > > - direction); > > + if (attrs & DMA_ATTR_MMIO) > > + return DMA_MAPPING_ERROR; > > + > > + return ccio_map_single(dev, phys_to_virt(phys), size, > > direction); >=20 > This doesn't actually use the virt at all: >=20 > offset =3D ((unsigned long) addr) & ~IOVP_MASK; > if((size % L1_CACHE_BYTES) || ((unsigned long)addr % > L1_CACHE_BYTES)) > ccio_io_pdir_entry(pdir_start, KERNEL_SPACE, > (unsigned long)addr, hint); Actually, it does: it has to; parisc caches are VIPT. The iommu needs to know both the physical address and the virtual tag (also called the coherence index) to instruct the CPU to flush its cache. The sole use of the vba is in ccio_io_pdir_entry() which programs the IOMMU page table. The coherence index is pretty small because the largest VIPT cache stride parisc has is 4MB and obviously the lower 12 bits (page offset) are the same for both physical and virtual, so it's only the 10 bits between 4k and 4M that the iommu needs (the entry is 12 bits because architecturally there were chips with a 16M stride planned for but never produced). >=20 > And ccio_io_pdir_entry(): > pa =3D lpa(vba); >=20 > Is a special instruction that uses virt but AI tells me that special > LPA instruction is returning phys. Not sure if that is a different > value than virt_to_phys().. That's right, so if you want to pass both phys and virt addresses to the function, this could be dropped. Regards, James