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>, <patches@lists.linux.dev>,
Ryan Roberts <ryan.roberts@arm.com>,
Mostafa Saleh <smostafa@google.com>
Subject: Re: [PATCH v2 08/10] iommu/arm-smmu-v3: Shrink the cdtab l1_desc array
Date: Mon, 10 Jun 2024 20:02:38 -0700 [thread overview]
Message-ID: <Zme+TrcsIMtMmdUf@Asurada-Nvidia> (raw)
In-Reply-To: <8-v2-318ed5f6983b+198f-smmuv3_tidy_jgg@nvidia.com>
On Mon, Jun 10, 2024 at 09:31:17PM -0300, Jason Gunthorpe wrote:
> The top of the 2 level CD table is (at most) 1024 entries big, and two
> high order allocations are required. One of __le64 which is programmed
> into the HW (8k) and one of struct arm_smmu_l1_ctx_desc which holds the
> CPU pointer (16k).
>
> There are two copies of the l2ptr_dma, one is stored in the struct
> arm_smmu_l1_ctx_desc, and another is encoded in the __le64 for the HW to
> use. Instead of storing two copies just decode the value from the __le64.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
WARNING: multiple messages have this Message-ID (diff)
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>, <patches@lists.linux.dev>,
Ryan Roberts <ryan.roberts@arm.com>,
Mostafa Saleh <smostafa@google.com>
Subject: Re: [PATCH v2 08/10] iommu/arm-smmu-v3: Shrink the cdtab l1_desc array
Date: Mon, 10 Jun 2024 20:02:38 -0700 [thread overview]
Message-ID: <Zme+TrcsIMtMmdUf@Asurada-Nvidia> (raw)
In-Reply-To: <8-v2-318ed5f6983b+198f-smmuv3_tidy_jgg@nvidia.com>
On Mon, Jun 10, 2024 at 09:31:17PM -0300, Jason Gunthorpe wrote:
> The top of the 2 level CD table is (at most) 1024 entries big, and two
> high order allocations are required. One of __le64 which is programmed
> into the HW (8k) and one of struct arm_smmu_l1_ctx_desc which holds the
> CPU pointer (16k).
>
> There are two copies of the l2ptr_dma, one is stored in the struct
> arm_smmu_l1_ctx_desc, and another is encoded in the __le64 for the HW to
> use. Instead of storing two copies just decode the value from the __le64.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
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next prev parent reply other threads:[~2024-06-11 3:02 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-11 0:31 [PATCH v2 00/10] Tidy some minor things in the stream table/cd table area Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 0:31 ` [PATCH v2 01/10] iommu/arm-smmu-v3: Do not zero the strtab twice Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 0:50 ` Nicolin Chen
2024-06-11 0:50 ` Nicolin Chen
2024-06-11 23:52 ` Daniel Mentz
2024-06-12 11:46 ` Jason Gunthorpe
2024-06-11 0:31 ` [PATCH v2 02/10] iommu/arm-smmu-v3: Shrink the strtab l1_desc array Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 0:55 ` Nicolin Chen
2024-06-11 0:55 ` Nicolin Chen
2024-06-11 0:31 ` [PATCH v2 03/10] iommu/arm-smmu-v3: Add arm_smmu_strtab_l1/2_idx() Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 2:00 ` Nicolin Chen
2024-06-11 2:00 ` Nicolin Chen
2024-06-12 0:30 ` Daniel Mentz
2024-06-12 12:09 ` Jason Gunthorpe
2024-06-12 0:37 ` Daniel Mentz
2024-06-12 11:49 ` Jason Gunthorpe
2024-06-11 0:31 ` [PATCH v2 04/10] iommu/arm-smmu-v3: Add types for each level of the 2 level stream table Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 2:13 ` Nicolin Chen
2024-06-11 2:13 ` Nicolin Chen
2024-06-11 0:31 ` [PATCH v2 05/10] iommu/arm-smmu-v3: Reorganize struct arm_smmu_strtab_cfg Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 2:31 ` Nicolin Chen
2024-06-11 2:31 ` Nicolin Chen
2024-07-02 18:46 ` Will Deacon
2024-07-09 19:42 ` Jason Gunthorpe
2024-06-11 0:31 ` [PATCH v2 06/10] iommu/arm-smmu-v3: Remove strtab_base/cfg Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 2:36 ` Nicolin Chen
2024-06-11 2:36 ` Nicolin Chen
2024-06-11 0:31 ` [PATCH v2 07/10] iommu/arm-smmu-v3: Do not use devm for the cd table allocations Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 2:39 ` Nicolin Chen
2024-06-11 2:39 ` Nicolin Chen
2024-06-11 0:31 ` [PATCH v2 08/10] iommu/arm-smmu-v3: Shrink the cdtab l1_desc array Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 3:02 ` Nicolin Chen [this message]
2024-06-11 3:02 ` Nicolin Chen
2024-07-02 18:46 ` Will Deacon
2024-07-09 19:52 ` Jason Gunthorpe
2024-07-09 23:53 ` Jason Gunthorpe
2024-06-11 0:31 ` [PATCH v2 09/10] iommu/arm-smmu-v3: Add types for each level of the CD table Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 3:12 ` Nicolin Chen
2024-06-11 3:12 ` Nicolin Chen
2024-06-11 0:31 ` [PATCH v2 10/10] iommu/arm-smmu-v3: Reorganize struct arm_smmu_ctx_desc_cfg Jason Gunthorpe
2024-06-11 0:31 ` Jason Gunthorpe
2024-06-11 3:25 ` Nicolin Chen
2024-06-11 3:25 ` Nicolin Chen
2024-06-11 3:27 ` [PATCH v2 00/10] Tidy some minor things in the stream table/cd table area Nicolin Chen
2024-06-11 3:27 ` Nicolin Chen
2024-07-02 18:43 ` Will Deacon
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