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[34.140.83.185]) by smtp.gmail.com with ESMTPSA id n40-20020a05600c3ba800b00411c724fa10sm1694378wms.2.2024.02.13.07.37.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Feb 2024 07:37:47 -0800 (PST) Date: Tue, 13 Feb 2024 15:37:43 +0000 From: Mostafa Saleh To: Jason Gunthorpe Cc: iommu@lists.linux.dev, Joerg Roedel , linux-arm-kernel@lists.infradead.org, Robin Murphy , Will Deacon , Lu Baolu , Jean-Philippe Brucker , Joerg Roedel , Moritz Fischer , Moritz Fischer , Michael Shavit , Nicolin Chen , patches@lists.linux.dev, Shameer Kolothum , Zhangfei Gao Subject: Re: [PATCH v5 03/17] iommu/arm-smmu-v3: Move arm_smmu_rmr_install_bypass_ste() Message-ID: References: <0-v5-cd1be8dd9c71+3fa-smmuv3_newapi_p1_jgg@nvidia.com> <3-v5-cd1be8dd9c71+3fa-smmuv3_newapi_p1_jgg@nvidia.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3-v5-cd1be8dd9c71+3fa-smmuv3_newapi_p1_jgg@nvidia.com> Hi Jason, On Tue, Feb 06, 2024 at 11:12:40AM -0400, Jason Gunthorpe wrote: > Logically arm_smmu_init_strtab() is the function that allocates and > populates the stream table with the initial value of the STEs. After this > function returns the stream table should be fully ready. > > arm_smmu_rmr_install_bypass_ste() adjusts the initial stream table to force > any SIDs that the FW says have IOMMU_RESV_DIRECT to use bypass. This > ensures there is no disruption to the identity mapping during boot. > > Put arm_smmu_rmr_install_bypass_ste() into arm_smmu_init_strtab(), it > already executes immediately after arm_smmu_init_strtab(). > > No functional change intended. I think arm_smmu_init_strtab is quite low level to abstract FW configuration in it. For example in KVM[1] we'd re-use a big part of this driver and rely on similar low-level functions. But no strong opinion. [1] https://lore.kernel.org/kvmarm/20230201125328.2186498-1-jean-philippe@linaro.org/ Thanks, Mostafa > Tested-by: Shameer Kolothum > Tested-by: Nicolin Chen > Tested-by: Moritz Fischer > Signed-off-by: Jason Gunthorpe > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 +++++--- > 1 file changed, 5 insertions(+), 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 6123e5ad95822c..2ab36dcf7c61f5 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > @@ -101,6 +101,8 @@ static struct arm_smmu_option_prop arm_smmu_options[] = { > { 0, NULL}, > }; > > +static void arm_smmu_rmr_install_bypass_ste(struct arm_smmu_device *smmu); > + > static void parse_driver_options(struct arm_smmu_device *smmu) > { > int i = 0; > @@ -3256,6 +3258,7 @@ static int arm_smmu_init_strtab_linear(struct arm_smmu_device *smmu) > cfg->strtab_base_cfg = reg; > > arm_smmu_init_bypass_stes(strtab, cfg->num_l1_ents); > + > return 0; > } > > @@ -3279,6 +3282,8 @@ static int arm_smmu_init_strtab(struct arm_smmu_device *smmu) > > ida_init(&smmu->vmid_map); > > + /* Check for RMRs and install bypass STEs if any */ > + arm_smmu_rmr_install_bypass_ste(smmu); > return 0; > } > > @@ -4073,9 +4078,6 @@ static int arm_smmu_device_probe(struct platform_device *pdev) > /* Record our private device structure */ > platform_set_drvdata(pdev, smmu); > > - /* Check for RMRs and install bypass STEs if any */ > - arm_smmu_rmr_install_bypass_ste(smmu); > - > /* Reset the device */ > ret = arm_smmu_device_reset(smmu, bypass); > if (ret) > -- > 2.43.0 > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DEF6FC48260 for ; 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[34.140.83.185]) by smtp.gmail.com with ESMTPSA id n40-20020a05600c3ba800b00411c724fa10sm1694378wms.2.2024.02.13.07.37.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Feb 2024 07:37:47 -0800 (PST) Date: Tue, 13 Feb 2024 15:37:43 +0000 From: Mostafa Saleh To: Jason Gunthorpe Cc: iommu@lists.linux.dev, Joerg Roedel , linux-arm-kernel@lists.infradead.org, Robin Murphy , Will Deacon , Lu Baolu , Jean-Philippe Brucker , Joerg Roedel , Moritz Fischer , Moritz Fischer , Michael Shavit , Nicolin Chen , patches@lists.linux.dev, Shameer Kolothum , Zhangfei Gao Subject: Re: [PATCH v5 03/17] iommu/arm-smmu-v3: Move arm_smmu_rmr_install_bypass_ste() Message-ID: References: <0-v5-cd1be8dd9c71+3fa-smmuv3_newapi_p1_jgg@nvidia.com> <3-v5-cd1be8dd9c71+3fa-smmuv3_newapi_p1_jgg@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <3-v5-cd1be8dd9c71+3fa-smmuv3_newapi_p1_jgg@nvidia.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240213_073750_560233_1967180C X-CRM114-Status: GOOD ( 23.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Jason, On Tue, Feb 06, 2024 at 11:12:40AM -0400, Jason Gunthorpe wrote: > Logically arm_smmu_init_strtab() is the function that allocates and > populates the stream table with the initial value of the STEs. After this > function returns the stream table should be fully ready. > > arm_smmu_rmr_install_bypass_ste() adjusts the initial stream table to force > any SIDs that the FW says have IOMMU_RESV_DIRECT to use bypass. This > ensures there is no disruption to the identity mapping during boot. > > Put arm_smmu_rmr_install_bypass_ste() into arm_smmu_init_strtab(), it > already executes immediately after arm_smmu_init_strtab(). > > No functional change intended. I think arm_smmu_init_strtab is quite low level to abstract FW configuration in it. For example in KVM[1] we'd re-use a big part of this driver and rely on similar low-level functions. But no strong opinion. [1] https://lore.kernel.org/kvmarm/20230201125328.2186498-1-jean-philippe@linaro.org/ Thanks, Mostafa > Tested-by: Shameer Kolothum > Tested-by: Nicolin Chen > Tested-by: Moritz Fischer > Signed-off-by: Jason Gunthorpe > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 +++++--- > 1 file changed, 5 insertions(+), 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 6123e5ad95822c..2ab36dcf7c61f5 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > @@ -101,6 +101,8 @@ static struct arm_smmu_option_prop arm_smmu_options[] = { > { 0, NULL}, > }; > > +static void arm_smmu_rmr_install_bypass_ste(struct arm_smmu_device *smmu); > + > static void parse_driver_options(struct arm_smmu_device *smmu) > { > int i = 0; > @@ -3256,6 +3258,7 @@ static int arm_smmu_init_strtab_linear(struct arm_smmu_device *smmu) > cfg->strtab_base_cfg = reg; > > arm_smmu_init_bypass_stes(strtab, cfg->num_l1_ents); > + > return 0; > } > > @@ -3279,6 +3282,8 @@ static int arm_smmu_init_strtab(struct arm_smmu_device *smmu) > > ida_init(&smmu->vmid_map); > > + /* Check for RMRs and install bypass STEs if any */ > + arm_smmu_rmr_install_bypass_ste(smmu); > return 0; > } > > @@ -4073,9 +4078,6 @@ static int arm_smmu_device_probe(struct platform_device *pdev) > /* Record our private device structure */ > platform_set_drvdata(pdev, smmu); > > - /* Check for RMRs and install bypass STEs if any */ > - arm_smmu_rmr_install_bypass_ste(smmu); > - > /* Reset the device */ > ret = arm_smmu_device_reset(smmu, bypass); > if (ret) > -- > 2.43.0 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel