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From: Jason Gunthorpe <jgg@nvidia.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: fenghua.yu@intel.com, catalin.marinas@arm.com,
	robin.murphy@arm.com, linux-mm@kvack.org,
	iommu@lists.linux-foundation.org, zhangfei.gao@linaro.org,
	will@kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v10 12/13] iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind()
Date: Tue, 24 Nov 2020 19:58:00 -0400	[thread overview]
Message-ID: <20201124235800.GA242277@nvidia.com> (raw)
In-Reply-To: <20200918101852.582559-13-jean-philippe@linaro.org>

On Fri, Sep 18, 2020 at 12:18:52PM +0200, Jean-Philippe Brucker wrote:

> +/* Allocate or get existing MMU notifier for this {domain, mm} pair */
> +static struct arm_smmu_mmu_notifier *
> +arm_smmu_mmu_notifier_get(struct arm_smmu_domain *smmu_domain,
> +			  struct mm_struct *mm)
> +{
> +	int ret;
> +	struct arm_smmu_ctx_desc *cd;
> +	struct arm_smmu_mmu_notifier *smmu_mn;
> +
> +	list_for_each_entry(smmu_mn, &smmu_domain->mmu_notifiers, list) {
> +		if (smmu_mn->mn.mm == mm) {
> +			refcount_inc(&smmu_mn->refs);
> +			return smmu_mn;
> +		}
> +	}
> +
> +	cd = arm_smmu_alloc_shared_cd(mm);
> +	if (IS_ERR(cd))
> +		return ERR_CAST(cd);
> +
> +	smmu_mn = kzalloc(sizeof(*smmu_mn), GFP_KERNEL);
> +	if (!smmu_mn) {
> +		ret = -ENOMEM;
> +		goto err_free_cd;
> +	}
> +
> +	refcount_set(&smmu_mn->refs, 1);
> +	smmu_mn->cd = cd;
> +	smmu_mn->domain = smmu_domain;
> +	smmu_mn->mn.ops = &arm_smmu_mmu_notifier_ops;
> +
> +	ret = mmu_notifier_register(&smmu_mn->mn, mm);
> +	if (ret) {
> +		kfree(smmu_mn);
> +		goto err_free_cd;
> +	}

I suppose this hasn't been applied yet, but someone asked me to look
at this series..

Why did you drop the change to mmu_notifier_get here? 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..

Thanks,
Jason
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  reply	other threads:[~2020-11-24 23:58 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-18 10:18 [PATCH v10 00/13] iommu: Shared Virtual Addressing for SMMUv3 (PT sharing part) Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 01/13] mm: Define pasid in mm Jean-Philippe Brucker
2020-09-28 22:22   ` Will Deacon
2020-09-28 22:43     ` Fenghua Yu
2020-09-30  9:13       ` Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 02/13] iommu/ioasid: Add ioasid references Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 03/13] iommu/sva: Add PASID helpers Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 04/13] arm64: mm: Pin down ASIDs for sharing mm with devices Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 05/13] iommu/io-pgtable-arm: Move some definitions to a header Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 06/13] arm64: cpufeature: Export symbol read_sanitised_ftr_reg() Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 07/13] iommu/arm-smmu-v3: Move definitions to a header Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 08/13] iommu/arm-smmu-v3: Share process page tables Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 09/13] iommu/arm-smmu-v3: Seize private ASID Jean-Philippe Brucker
2020-09-18 13:07   ` Jonathan Cameron
2020-09-18 10:18 ` [PATCH v10 10/13] iommu/arm-smmu-v3: Check for SVA features Jean-Philippe Brucker
2020-09-21  8:59   ` Shameerali Kolothum Thodi
2020-09-24 10:13     ` Jean-Philippe Brucker
2020-09-24 11:13       ` Shameerali Kolothum Thodi
2020-12-09 19:49         ` Krishna Reddy
2020-12-09 20:07           ` Will Deacon
2020-12-09 20:38             ` Krishna Reddy
2020-12-14  9:32           ` Jean-Philippe Brucker
2020-12-14 23:23             ` Krishna Reddy
2020-09-18 10:18 ` [PATCH v10 11/13] iommu/arm-smmu-v3: Add SVA device feature Jean-Philippe Brucker
2020-12-15  1:09   ` Krishna Reddy
2021-01-06 10:09     ` Jean-Philippe Brucker
2021-01-06 17:23       ` Krishna Reddy
2020-09-18 10:18 ` [PATCH v10 12/13] iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind() Jean-Philippe Brucker
2020-11-24 23:58   ` Jason Gunthorpe [this message]
2020-11-25  9:27     ` Jean-Philippe Brucker
2020-11-26  0:37       ` Jason Gunthorpe
2020-09-18 10:18 ` [PATCH v10 13/13] iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops Jean-Philippe Brucker
2020-09-18 13:15 ` [PATCH v10 00/13] iommu: Shared Virtual Addressing for SMMUv3 (PT sharing part) Jonathan Cameron
2020-09-28 16:47 ` Jean-Philippe Brucker
2020-09-28 17:23   ` Will Deacon
2020-09-28 22:39     ` Will Deacon
2020-09-30  9:12       ` Jean-Philippe Brucker

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