linux-kernel - Re: [PATCH v4 20/23] iommu/tegra241-cmdqv: Simplify deinit flow in tegra241_cmdqv_remove

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Message-ID: <20250515172708.GQ382960@nvidia.com>
Date: Thu, 15 May 2025 14:27:08 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, corbet@....net, will@...nel.org,
	bagasdotme@...il.com, robin.murphy@....com, joro@...tes.org,
	thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
	shuah@...nel.org, jsnitsel@...hat.com, nathan@...nel.org,
	peterz@...radead.org, yi.l.liu@...el.com, mshavit@...gle.com,
	praan@...gle.com, zhangzekun11@...wei.com, iommu@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kselftest@...r.kernel.org, patches@...ts.linux.dev,
	mochs@...dia.com, alok.a.tiwari@...cle.com, vasant.hegde@....com
Subject: Re: [PATCH v4 20/23] iommu/tegra241-cmdqv: Simplify deinit flow in
 tegra241_cmdqv_remove_vintf()

On Thu, May 08, 2025 at 08:02:41PM -0700, Nicolin Chen wrote:
> The current flow of tegra241_cmdqv_remove_vintf() is:
>  1. For each LVCMDQ, tegra241_vintf_remove_lvcmdq():
>     a. Disable the LVCMDQ HW
>     b. Release the LVCMDQ SW resource
>  2. For current VINTF, tegra241_vintf_hw_deinit():
>     c. Disable all LVCMDQ HWs
>     d. Disable VINTF HW
> 
> Obviously, the step 1.a and the step 2.c are redundant.
> 
> Since tegra241_vintf_hw_deinit() disables all of its LVCMDQ HWs, it could
> simplify the flow in tegra241_cmdqv_remove_vintf() by calling that first:
>  1. For current VINTF, tegra241_vintf_hw_deinit():
>     a. Disable all LVCMDQ HWs
>     b. Disable VINTF HW
>  2. Release all LVCMDQ SW resources
> 
> Drop tegra241_vintf_remove_lvcmdq(), and move tegra241_vintf_free_lvcmdq()
> as the new step 2.
> 
> Acked-by: Pranjal Shrivastava <praan@...gle.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 13 +++----------
>  1 file changed, 3 insertions(+), 10 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason