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Message-ID: <ZMiJ9Cg5wfbxMZ+W@Asurada-Nvidia>
Date: Mon, 31 Jul 2023 21:28:36 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Michael Shavit <mshavit@...gle.com>
CC: <iommu@...ts.linux.dev>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <will@...nel.org>,
<robin.murphy@....com>, <jgg@...dia.com>,
<jean-philippe@...aro.org>
Subject: Re: [PATCH v2 4/8] iommu/arm-smmu-v3: move stall_enabled to the cd
table
On Mon, Jul 31, 2023 at 06:48:14PM +0800, Michael Shavit wrote:
> This controls whether CD entries will have the stall bit set when
> writing entries into the table.
>
> Signed-off-by: Michael Shavit <mshavit@...gle.com>
> ---
>
> Changes in v2:
> - Use a bitfield instead of a bool for stall_enabled
>
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 ++++----
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 3 ++-
> 2 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 8a286e3838d70..654acf6002bf3 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -1114,7 +1114,7 @@ int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
> FIELD_PREP(CTXDESC_CD_0_ASID, cd->asid) |
> CTXDESC_CD_0_V;
>
> - if (smmu_domain->stall_enabled)
> + if (smmu_domain->cd_table.stall_enabled)
> val |= CTXDESC_CD_0_S;
This cd_table->stall_enabled comes from master->stall_enabled, and
cd_table will be in master structure. Also, struct arm_smmu_master
pointer will be passed in to arm_smmu_write_ctx_desc(). So, there
seems to be no need of master->cd_table.stall_enabled in the end;
just use master->stall_enabled directly?
Thanks
Nicolin
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