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Sat, 12 Sep 2020 20:26:02 -0700 (PDT) Date: Sat, 12 Sep 2020 22:25:59 -0500 From: Bjorn Andersson To: Robin Murphy Subject: Re: [PATCH v3 6/8] iommu/arm-smmu: Add impl hook for inherit boot mappings Message-ID: <20200913032559.GT3715@yoga> References: <20200904155513.282067-1-bjorn.andersson@linaro.org> <20200904155513.282067-7-bjorn.andersson@linaro.org> <0bfcc8f7-d054-616b-834b-319461b1ecb9@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <0bfcc8f7-d054-616b-834b-319461b1ecb9@arm.com> Cc: Rob Clark , linux-arm-msm@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Sibi Sankar , Will Deacon , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Fri 11 Sep 12:13 CDT 2020, Robin Murphy wrote: > On 2020-09-04 16:55, Bjorn Andersson wrote: > > Add a new operation to allow platform implementations to inherit any > > stream mappings from the boot loader. > > Is there a reason we need an explicit step for this? The aim of the > cfg_probe hook is that the SMMU software state should all be set up by then, > and you can mess about with it however you like before arm_smmu_reset() > actually commits anything to hardware. I would have thought you could > permanently steal a context bank, configure it as your bypass hole, read out > the previous SME configuration and tweak smmu->smrs and smmu->s2crs > appropriately all together "invisibly" at that point. I did this because as of 6a79a5a3842b ("iommu/arm-smmu: Call configuration impl hook before consuming features") we no longer have setup pgsize_bitmap as we hit cfg_probe, which means that I need to replicate this logic to set up the iommu_domain. If I avoid setting up an iommu_domain for the identity context, as you request in patch 8, this shouldn't be needed anymore. > If that can't work, I'm very curious as to what I've overlooked. > I believe that will work, I will rework the patches and try it out. Thanks, Bjorn > Robin. > > > Signed-off-by: Bjorn Andersson > > --- > > > > Changes since v2: > > - New patch/interface > > > > drivers/iommu/arm/arm-smmu/arm-smmu.c | 11 ++++++----- > > drivers/iommu/arm/arm-smmu/arm-smmu.h | 6 ++++++ > > 2 files changed, 12 insertions(+), 5 deletions(-) > > > > diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c > > index eb5c6ca5c138..4c4d302cd747 100644 > > --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c > > +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c > > @@ -85,11 +85,6 @@ static inline void arm_smmu_rpm_put(struct arm_smmu_device *smmu) > > pm_runtime_put_autosuspend(smmu->dev); > > } > > -static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom) > > -{ > > - return container_of(dom, struct arm_smmu_domain, domain); > > -} > > - > > static struct platform_driver arm_smmu_driver; > > static struct iommu_ops arm_smmu_ops; > > @@ -2188,6 +2183,12 @@ static int arm_smmu_device_probe(struct platform_device *pdev) > > if (err) > > return err; > > + if (smmu->impl->inherit_mappings) { > > + err = smmu->impl->inherit_mappings(smmu); > > + if (err) > > + return err; > > + } > > + > > if (smmu->version == ARM_SMMU_V2) { > > if (smmu->num_context_banks > smmu->num_context_irqs) { > > dev_err(dev, > > diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h > > index 235d9a3a6ab6..f58164976e74 100644 > > --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h > > +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h > > @@ -378,6 +378,11 @@ struct arm_smmu_domain { > > struct iommu_domain domain; > > }; > > +static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom) > > +{ > > + return container_of(dom, struct arm_smmu_domain, domain); > > +} > > + > > struct arm_smmu_master_cfg { > > struct arm_smmu_device *smmu; > > s16 smendx[]; > > @@ -442,6 +447,7 @@ struct arm_smmu_impl { > > int (*alloc_context_bank)(struct arm_smmu_domain *smmu_domain, > > struct arm_smmu_device *smmu, > > struct device *dev, int start); > > + int (*inherit_mappings)(struct arm_smmu_device *smmu); > > }; > > #define INVALID_SMENDX -1 > > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu