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From: Nicolin Chen <nicolinc@nvidia.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: <iommu@lists.linux.dev>, Joerg Roedel <joro@8bytes.org>,
	<linux-arm-kernel@lists.infradead.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Shavit <mshavit@google.com>,
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
Subject: Re: [PATCH v2 09/19] iommu/arm-smmu-v3: Hold arm_smmu_asid_lock during all of attach_dev
Date: Mon, 4 Dec 2023 18:16:43 -0800	[thread overview]
Message-ID: <ZW6IC/gSOViGrGIG@Asurada-Nvidia> (raw)
In-Reply-To: <9-v2-de8b10590bf5+400-smmuv3_newapi_p1_jgg@nvidia.com>

On Mon, Nov 13, 2023 at 01:53:16PM -0400, Jason Gunthorpe wrote:
> The BTM support wants to be able to change the ASID of any smmu_domain.
> When it goes to do this it holds the arm_smmu_asid_lock and iterates over
> the target domain's devices list.
> 
> During attach of a S1 domain we must ensure that the devices list and
> CD are in sync, otherwise we could miss CD updates or a parallel CD update
> could push an out of date CD.
> 
> This is pretty complicated, and works today because arm_smmu_detach_dev()
> remove the CD table from the STE before working on the CD entries.
> 
> The next patch will allow the CD table to remain in the STE so solve this
> racy by holding the lock for a longer period. The lock covers both of the
> changes to the device list and the CD table entries.
> 
> Move arm_smmu_detach_dev() till after we have initialized the domain so
> the lock can be held for less time.
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
 
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

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  parent reply	other threads:[~2023-12-05  2:17 UTC|newest]

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-13 17:53 [PATCH v2 00/19] Update SMMUv3 to the modern iommu API (part 1/3) Jason Gunthorpe
2023-11-13 17:53 ` [PATCH v2 01/19] iommu/arm-smmu-v3: Add a type for the STE Jason Gunthorpe
2023-11-14 15:06   ` Moritz Fischer
2023-11-15 11:52     ` Michael Shavit
2023-11-15 13:35       ` Jason Gunthorpe
2023-11-27 16:03   ` Eric Auger
2023-11-27 17:42     ` Jason Gunthorpe
2023-11-27 17:51       ` Eric Auger
2023-11-27 18:21         ` Jason Gunthorpe
2023-12-05  0:44   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 02/19] iommu/arm-smmu-v3: Master cannot be NULL in arm_smmu_write_strtab_ent() Jason Gunthorpe
2023-11-14 15:17   ` Moritz Fischer
2023-11-15 11:55     ` Michael Shavit
2023-11-27 15:41   ` Eric Auger
2023-12-05  0:45   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 03/19] iommu/arm-smmu-v3: Remove ARM_SMMU_DOMAIN_NESTED Jason Gunthorpe
2023-11-14 15:18   ` Moritz Fischer
2023-11-27 16:35   ` Eric Auger
2023-12-05  0:46   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 04/19] iommu/arm-smmu-v3: Make STE programming independent of the callers Jason Gunthorpe
2023-12-05  1:38   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 05/19] iommu/arm-smmu-v3: Consolidate the STE generation for abort/bypass Jason Gunthorpe
2023-11-15 12:17   ` Michael Shavit
2023-12-05  1:43   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 06/19] iommu/arm-smmu-v3: Move arm_smmu_rmr_install_bypass_ste() Jason Gunthorpe
2023-11-15 13:57   ` Michael Shavit
2023-12-05  1:45   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 07/19] iommu/arm-smmu-v3: Move the STE generation for S1 and S2 domains into functions Jason Gunthorpe
2023-11-14 15:24   ` Moritz Fischer
2023-11-15 14:01   ` Michael Shavit
2023-12-05  1:55   ` Nicolin Chen
2023-12-05 14:35     ` Jason Gunthorpe
2023-11-13 17:53 ` [PATCH v2 08/19] iommu/arm-smmu-v3: Build the whole STE in arm_smmu_make_s2_domain_ste() Jason Gunthorpe
2023-11-15 14:04   ` Michael Shavit
2023-12-05  1:58   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 09/19] iommu/arm-smmu-v3: Hold arm_smmu_asid_lock during all of attach_dev Jason Gunthorpe
2023-11-15 14:12   ` Michael Shavit
2023-12-05  2:16   ` Nicolin Chen [this message]
2023-11-13 17:53 ` [PATCH v2 10/19] iommu/arm-smmu-v3: Compute the STE only once for each master Jason Gunthorpe
2023-11-15 14:16   ` Michael Shavit
2023-12-05  2:13   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 11/19] iommu/arm-smmu-v3: Do not change the STE twice during arm_smmu_attach_dev() Jason Gunthorpe
2023-11-15 15:15   ` Michael Shavit
2023-11-16 16:28     ` Jason Gunthorpe
2023-12-05  2:46   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 12/19] iommu/arm-smmu-v3: Put writing the context descriptor in the right order Jason Gunthorpe
2023-11-15 15:32   ` Michael Shavit
2023-11-16 16:46     ` Jason Gunthorpe
2023-11-17  4:14       ` Michael Shavit
2023-12-05  3:38   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 13/19] iommu/arm-smmu-v3: Pass smmu_domain to arm_enable/disable_ats() Jason Gunthorpe
2023-12-05  3:56   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 14/19] iommu/arm-smmu-v3: Remove arm_smmu_master->domain Jason Gunthorpe
2023-11-27 17:14   ` Eric Auger
2023-11-30 12:03     ` Jason Gunthorpe
2023-12-05 13:25       ` Eric Auger
2023-12-05  4:47   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 15/19] iommu/arm-smmu-v3: Add a global static IDENTITY domain Jason Gunthorpe
2023-11-15 15:50   ` Michael Shavit
2023-12-05  4:28   ` Nicolin Chen
2023-12-05 14:37     ` Jason Gunthorpe
2023-12-05 17:25       ` Nicolin Chen
2023-12-05 17:42         ` Jason Gunthorpe
2023-12-05 18:21           ` Nicolin Chen
2023-12-05 19:03             ` Jason Gunthorpe
2023-11-13 17:53 ` [PATCH v2 16/19] iommu/arm-smmu-v3: Add a global static BLOCKED domain Jason Gunthorpe
2023-11-15 15:57   ` Michael Shavit
2023-11-16 15:44     ` Jason Gunthorpe
2023-12-05  4:05   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 17/19] iommu/arm-smmu-v3: Use the identity/blocked domain during release Jason Gunthorpe
2023-12-05  4:07   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 18/19] iommu/arm-smmu-v3: Pass arm_smmu_domain and arm_smmu_device to finalize Jason Gunthorpe
2023-11-15 16:02   ` Michael Shavit
2023-12-05  4:42   ` Nicolin Chen
2023-11-13 17:53 ` [PATCH v2 19/19] iommu/arm-smmu-v3: Convert to domain_alloc_paging() Jason Gunthorpe
2023-12-05  4:40   ` Nicolin Chen
2023-11-27 16:10 ` [PATCH v2 00/19] Update SMMUv3 to the modern iommu API (part 1/3) Shameerali Kolothum Thodi
2023-11-27 17:48   ` Jason Gunthorpe
2023-12-05  3:54 ` Nicolin Chen

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