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Thu, 26 Nov 2020 00:37:28 +0000 Date: Wed, 25 Nov 2020 20:37:26 -0400 From: Jason Gunthorpe To: Jean-Philippe Brucker CC: , , , , , , , , , , , , , Subject: Re: [PATCH v10 12/13] iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind() Message-ID: <20201126003726.GR4800@nvidia.com> References: <20200918101852.582559-1-jean-philippe@linaro.org> <20200918101852.582559-13-jean-philippe@linaro.org> <20201124235800.GA242277@nvidia.com> <20201125092749.GA2445658@myrica> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20201125092749.GA2445658@myrica> X-ClientProxiedBy: MN2PR20CA0043.namprd20.prod.outlook.com (2603:10b6:208:235::12) To BY5PR12MB3827.namprd12.prod.outlook.com (2603:10b6:a03:1ab::16) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (156.34.48.30) by MN2PR20CA0043.namprd20.prod.outlook.com (2603:10b6:208:235::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3611.20 via Frontend Transport; Thu, 26 Nov 2020 00:37:27 +0000 Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1ki5Hq-001Ste-1M; Wed, 25 Nov 2020 20:37:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1606351068; bh=JbzsTp3wxHd9dOviT+Eu4ZEFLammA3l7NwDYpVtYxtU=; h=ARC-Seal:ARC-Message-Signature:ARC-Authentication-Results:Date: From:To:CC:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:X-ClientProxiedBy:MIME-Version: X-MS-Exchange-MessageSentRepresentingType; b=Lb1r96H2PGUQX1q4HjZrOCcGcxSYiNc1NNa4IJdvHR8dW39dbzWxQ2L5Sgaf9NLGm n7wjlh1Slm6hrDAaDUjpPEtXKo8571i5Py9Knr1Q7tF8ZN1UVMYRUsXkVl/p6e1F9Y ivoo1bRG7BCQzwvA9owL4p8A0jJeLvjxRsDyMYI7Ouk6TCBAnrCSCs0BSrLRHPgbIQ Fgf0i7xDPOwtyCx9zcvsqoDAErddqc+M1fmOrcooe24LpgX3pmmAMez9svIZTQJRmQ jQkbjHYfIBxL0YimWEOSPjo4tw29w30FfgQ/+gSVaLnm6gCXfnRPmONCDmez04TbjQ GnxWUOPpGVylw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Nov 25, 2020 at 10:27:49AM +0100, Jean-Philippe Brucker wrote: > > I'm strongly > > trying to discourage static lists matching mm's like smmu_mn is > > doing. This is handled by the core code, don't open code it.. > > We discussed this at v6, which wonkily stored the mn ops in the domain to > obtain a unique notifier per {mm, domain}. A clean solution requires > changing mm_notifier_get() to use an opaque token. Rather than testing > {mm, ops} uniqueness it would compare {mm, ops, token}. I figured it > wasn't worth the effort for a single driver, especially since the SMMU > driver would still have one list matching because it needs to deal with > both {mm, domain} and {mm, device} uniqueness. > https://lore.kernel.org/linux-iommu/20200501121552.GA6012@infradead.org/ Oh, that was a long time ago.. OK Thanks, Jason