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[34.124.234.44]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-367c2ccfbeasm311186a91.13.2026.05.08.10.17.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 May 2026 10:17:20 -0700 (PDT) Date: Fri, 8 May 2026 17:17:14 +0000 From: Pranjal Shrivastava To: Jason Gunthorpe Cc: iommu@lists.linux.dev, Jonathan Hunter , Joerg Roedel , linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, Robin Murphy , Thierry Reding , Krishna Reddy , Will Deacon , David Matlack , Pasha Tatashin , patches@lists.linux.dev, Samiullah Khawaja , Mostafa Saleh Subject: Re: [PATCH 5/9] iommu/arm-smmu-v3: Remove CMDQ_OP_CFGI_CD_ALL from arm_smmu_cmdq_build_cmd() Message-ID: References: <0-v1-b7dc0a0d4aa0+3723d-smmu_no_cmdq_ent_jgg@nvidia.com> <5-v1-b7dc0a0d4aa0+3723d-smmu_no_cmdq_ent_jgg@nvidia.com> <20260508160236.GG9254@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260508160236.GG9254@nvidia.com> On Fri, May 08, 2026 at 01:02:36PM -0300, Jason Gunthorpe wrote: > On Fri, May 08, 2026 at 09:45:55AM +0000, Pranjal Shrivastava wrote: > > On Fri, May 01, 2026 at 11:29:14AM -0300, Jason Gunthorpe wrote: > > > Nothing uses this, just dead code. > > > > > > Signed-off-by: Jason Gunthorpe > > > --- > > > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 3 --- > > > 1 file changed, 3 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 b3ef001ce80d23..ef0907b1a2204f 100644 > > > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > > > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > > > @@ -290,9 +290,6 @@ static int arm_smmu_cmdq_build_cmd(struct arm_smmu_cmd *cmd_out, > > > cmd[0] |= FIELD_PREP(CMDQ_CFGI_0_SID, ent->cfgi.sid); > > > cmd[1] |= FIELD_PREP(CMDQ_CFGI_1_LEAF, ent->cfgi.leaf); > > > break; > > > - case CMDQ_OP_CFGI_CD_ALL: > > > - cmd[0] |= FIELD_PREP(CMDQ_CFGI_0_SID, ent->cfgi.sid); > > > - break; > > > case CMDQ_OP_CFGI_ALL: > > > /* Cover the entire SID range */ > > > cmd[1] |= FIELD_PREP(CMDQ_CFGI_1_RANGE, 31); > > > > CMDQ_OP_CFGI_CD_ALL is also present in arm-smmu-v3-iommufd.c > > I'm wondering if we should remove this from the iommufd.c file too? > > > This op code seems to be unused since 5.15, if a guest is running the > > same Linux driver, it will never generate this command anyway. > > Yes > > > Unless we care about Guest VMs running non-Linux OSes, > > We certainly do :) > > And who knows, Linux might start using it someday! > > Guest emulation has to cover all the commands a guest is allowed to > execute, and that is what the iommufd code is doing. Alright, it makes sense to keep it in iommufd fir diverse guests. No further concerns. Thanks, Praan