From: Auger Eric <eric.auger@redhat.com> To: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>, will.deacon@arm.com Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, jacob.jun.pan@linux.intel.com, joro@8bytes.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, robh+dt@kernel.org, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 8/8] iommu/arm-smmu-v3: Add support for PCI PASID Date: Mon, 8 Jul 2019 09:58:16 +0200 Message-ID: <b0e3d9a9-6085-b393-1982-3dd95bf5d100@redhat.com> (raw) In-Reply-To: <20190610184714.6786-9-jean-philippe.brucker@arm.com> Hi Jean, On 6/10/19 8:47 PM, Jean-Philippe Brucker wrote: > Enable PASID for PCI devices that support it. Since the SSID tables are > allocated by arm_smmu_attach_dev(), PASID has to be enabled early enough. > arm_smmu_dev_feature_enable() would be too late, since by that time the > main DMA domain has already been attached. Do it in add_device() instead. > > Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> > --- > drivers/iommu/arm-smmu-v3.c | 51 ++++++++++++++++++++++++++++++++++++- > 1 file changed, 50 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c > index 972bfb80f964..a8a516d9ff10 100644 > --- a/drivers/iommu/arm-smmu-v3.c > +++ b/drivers/iommu/arm-smmu-v3.c > @@ -2197,6 +2197,49 @@ static void arm_smmu_disable_ats(struct arm_smmu_master *master) > master->ats_enabled = false; > } > > +static int arm_smmu_enable_pasid(struct arm_smmu_master *master) > +{ > + int ret; > + int features; > + int num_pasids; > + struct pci_dev *pdev; > + > + if (!dev_is_pci(master->dev)) > + return -ENOSYS; > + > + pdev = to_pci_dev(master->dev); > + > + features = pci_pasid_features(pdev); > + if (features < 0) > + return -ENOSYS; > + > + num_pasids = pci_max_pasids(pdev); > + if (num_pasids <= 0) > + return -ENOSYS; > + > + ret = pci_enable_pasid(pdev, features); > + if (!ret) > + master->ssid_bits = min_t(u8, ilog2(num_pasids), > + master->smmu->ssid_bits); I don't really get why this setting is conditional to the success of pci_enabled_pasid and not num_pasids > 0. If it fails the ssid_bits is set to min(smmu->ssid_bits, fwspec->num_pasid_bits) anyway. > + return ret; > +} > + > +static void arm_smmu_disable_pasid(struct arm_smmu_master *master) > +{ > + struct pci_dev *pdev; > + > + if (!dev_is_pci(master->dev)) > + return; > + > + pdev = to_pci_dev(master->dev); > + > + if (!pdev->pasid_enabled) > + return; > + > + pci_disable_pasid(pdev); > + master->ssid_bits = 0; in case of a platform device you leave the ssid_bits to a value != 0. Is that what you want? > +} > + > static void arm_smmu_detach_dev(struct arm_smmu_master *master) > { > unsigned long flags; > @@ -2413,6 +2456,9 @@ static int arm_smmu_add_device(struct device *dev) > > master->ssid_bits = min(smmu->ssid_bits, fwspec->num_pasid_bits); > > + /* Note that PASID must be enabled before, and disabled after ATS */ > + arm_smmu_enable_pasid(master); In case the call fails, don't you want to handle the error and reset the ssid_bits? > + > /* > * If the SMMU doesn't support 2-stage CD, limit the linear > * tables to a reasonable number of contexts, let's say > @@ -2423,7 +2469,7 @@ static int arm_smmu_add_device(struct device *dev) > > ret = iommu_device_link(&smmu->iommu, dev); > if (ret) > - goto err_free_master; > + goto err_disable_pasid; > > group = iommu_group_get_for_dev(dev); > if (IS_ERR(group)) { > @@ -2436,6 +2482,8 @@ static int arm_smmu_add_device(struct device *dev) > > err_unlink: > iommu_device_unlink(&smmu->iommu, dev); > +err_disable_pasid: > + arm_smmu_disable_pasid(master); > err_free_master: > kfree(master); > fwspec->iommu_priv = NULL; > @@ -2456,6 +2504,7 @@ static void arm_smmu_remove_device(struct device *dev) > arm_smmu_detach_dev(master); > iommu_group_remove_device(dev); > iommu_device_unlink(&smmu->iommu, dev); > + arm_smmu_disable_pasid(master); > kfree(master); > iommu_fwspec_free(dev); > } > Thanks Eric _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply index Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-06-10 18:47 [PATCH 0/8] iommu: Add auxiliary domain and PASID support to Arm SMMUv3 Jean-Philippe Brucker 2019-06-10 18:47 ` [PATCH 1/8] iommu: Add I/O ASID allocator Jean-Philippe Brucker 2019-06-11 9:36 ` Jonathan Cameron 2019-06-11 14:35 ` Jean-Philippe Brucker 2019-06-11 18:13 ` Jacob Pan 2019-06-18 14:22 ` Jean-Philippe Brucker 2019-06-18 17:05 ` Jacob Pan 2019-06-19 14:26 ` Jean-Philippe Brucker 2019-06-11 12:26 ` Jacob Pan 2019-06-11 14:37 ` Jean-Philippe Brucker 2019-06-11 17:10 ` Jacob Pan 2019-06-12 11:30 ` Jean-Philippe Brucker 2019-06-10 18:47 ` [PATCH 2/8] dt-bindings: document PASID property for IOMMU masters Jean-Philippe Brucker 2019-07-08 7:58 ` Auger Eric 2019-06-10 18:47 ` [PATCH 3/8] iommu/arm-smmu-v3: Support platform SSID Jean-Philippe Brucker 2019-06-11 9:42 ` Jonathan Cameron 2019-06-11 14:35 ` Jean-Philippe Brucker 2019-06-18 18:08 ` Will Deacon 2019-06-19 11:53 ` Jean-Philippe Brucker 2019-07-08 7:58 ` Auger Eric 2019-09-19 14:51 ` Jean-Philippe Brucker 2019-06-10 18:47 ` [PATCH 4/8] iommu/arm-smmu-v3: Add support for Substream IDs Jean-Philippe Brucker 2019-06-11 10:19 ` Jonathan Cameron 2019-06-11 14:35 ` Jean-Philippe Brucker 2019-06-26 18:00 ` Will Deacon 2019-07-04 9:33 ` Jean-Philippe Brucker 2019-09-19 14:57 ` Jean-Philippe Brucker 2019-07-08 15:31 ` Auger Eric 2019-09-19 15:01 ` Jean-Philippe Brucker 2019-06-10 18:47 ` [PATCH 5/8] iommu/arm-smmu-v3: Add second level of context descriptor table Jean-Philippe Brucker 2019-06-11 10:24 ` Jonathan Cameron 2019-07-08 15:13 ` Auger Eric 2019-06-10 18:47 ` [PATCH 6/8] iommu/arm-smmu-v3: Support auxiliary domains Jean-Philippe Brucker 2019-06-26 17:59 ` Will Deacon 2019-07-05 16:29 ` Jean-Philippe Brucker 2019-09-19 15:06 ` Jean-Philippe Brucker 2019-06-10 18:47 ` [PATCH 7/8] iommu/arm-smmu-v3: Improve add_device() error handling Jean-Philippe Brucker 2019-07-08 7:58 ` Auger Eric 2019-06-10 18:47 ` [PATCH 8/8] iommu/arm-smmu-v3: Add support for PCI PASID Jean-Philippe Brucker 2019-06-11 10:45 ` Jonathan Cameron 2019-06-11 14:35 ` Jean-Philippe Brucker 2019-07-08 7:58 ` Auger Eric [this message] 2019-09-19 15:10 ` Jean-Philippe Brucker
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