From: Lu Baolu <baolu.lu@linux.intel.com> To: Joerg Roedel <joro@8bytes.org>, Alex Williamson <alex.williamson@redhat.com> Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>, Kevin Tian <kevin.tian@intel.com>, Dave Jiang <dave.jiang@intel.com>, Ashok Raj <ashok.raj@intel.com>, kvm@vger.kernel.org, Cornelia Huck <cohuck@redhat.com>, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Robin Murphy <robin.murphy@arm.com> Subject: [PATCH v3 3/4] iommu: Add iommu_aux_get_domain_for_dev() Date: Tue, 14 Jul 2020 13:57:02 +0800 [thread overview] Message-ID: <20200714055703.5510-4-baolu.lu@linux.intel.com> (raw) In-Reply-To: <20200714055703.5510-1-baolu.lu@linux.intel.com> The device driver needs an API to get its aux-domain. A typical usage scenario is: unsigned long pasid; struct iommu_domain *domain; struct device *dev = mdev_dev(mdev); struct device *iommu_device = vfio_mdev_get_iommu_device(dev); domain = iommu_aux_get_domain_for_dev(dev); if (!domain) return -ENODEV; pasid = iommu_aux_get_pasid(domain, iommu_device); if (pasid <= 0) return -EINVAL; /* Program the device context */ .... This adds an API for such use case. Suggested-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> --- drivers/iommu/iommu.c | 18 ++++++++++++++++++ include/linux/iommu.h | 7 +++++++ 2 files changed, 25 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index cad5a19ebf22..434bf42b6b9b 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2817,6 +2817,24 @@ void iommu_aux_detach_group(struct iommu_domain *domain, } EXPORT_SYMBOL_GPL(iommu_aux_detach_group); +struct iommu_domain *iommu_aux_get_domain_for_dev(struct device *dev) +{ + struct iommu_domain *domain = NULL; + struct iommu_group *group; + + group = iommu_group_get(dev); + if (!group) + return NULL; + + if (group->aux_domain_attached) + domain = group->domain; + + iommu_group_put(group); + + return domain; +} +EXPORT_SYMBOL_GPL(iommu_aux_get_domain_for_dev); + /** * iommu_sva_bind_device() - Bind a process address space to a device * @dev: the device diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 9506551139ab..cda6cef7579e 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -639,6 +639,7 @@ int iommu_aux_attach_group(struct iommu_domain *domain, struct iommu_group *group, struct device *dev); void iommu_aux_detach_group(struct iommu_domain *domain, struct iommu_group *group, struct device *dev); +struct iommu_domain *iommu_aux_get_domain_for_dev(struct device *dev); struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, @@ -1040,6 +1041,12 @@ iommu_aux_detach_group(struct iommu_domain *domain, { } +static inline struct iommu_domain * +iommu_aux_get_domain_for_dev(struct device *dev) +{ + return NULL; +} + static inline struct iommu_sva * iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) { -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-07-14 6:02 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-14 5:56 [PATCH v3 0/4] iommu aux-domain APIs extensions Lu Baolu 2020-07-14 5:57 ` [PATCH v3 1/4] iommu: Check IOMMU_DEV_FEAT_AUX feature in aux api's Lu Baolu 2020-07-29 20:03 ` Alex Williamson 2020-07-30 1:46 ` Lu Baolu 2020-07-14 5:57 ` [PATCH v3 2/4] iommu: Add iommu_aux_at(de)tach_group() Lu Baolu 2020-07-14 16:39 ` Jacob Pan 2020-07-15 0:47 ` Lu Baolu 2020-07-15 16:01 ` Jacob Pan 2020-07-16 1:07 ` Lu Baolu 2020-07-29 20:03 ` Alex Williamson 2020-07-29 23:34 ` Tian, Kevin 2020-07-30 19:46 ` Alex Williamson 2020-07-31 5:47 ` Lu Baolu 2020-07-31 18:05 ` Alex Williamson 2020-08-03 1:57 ` Lu Baolu 2020-07-14 5:57 ` Lu Baolu [this message] 2020-07-29 20:25 ` [PATCH v3 3/4] iommu: Add iommu_aux_get_domain_for_dev() Alex Williamson 2020-07-29 23:49 ` Tian, Kevin 2020-07-30 20:17 ` Alex Williamson 2020-07-31 0:26 ` Tian, Kevin 2020-07-31 2:17 ` Tian, Kevin 2020-07-31 6:30 ` Lu Baolu 2020-07-31 18:14 ` Alex Williamson 2020-08-03 2:15 ` Lu Baolu 2020-07-14 5:57 ` [PATCH v3 4/4] vfio/type1: Use iommu_aux_at(de)tach_group() APIs Lu Baolu 2020-07-14 8:25 ` Christoph Hellwig 2020-07-14 16:29 ` Jacob Pan 2020-07-15 1:00 ` Lu Baolu 2020-07-15 1:23 ` Tian, Kevin 2020-07-29 20:32 ` Alex Williamson 2020-07-30 2:41 ` Lu Baolu 2020-07-30 21:17 ` Alex Williamson 2020-07-31 1:37 ` Lu Baolu 2020-07-30 9:36 ` Liu, Yi L 2020-07-31 1:39 ` Lu Baolu 2020-07-23 13:55 ` [PATCH v3 0/4] iommu aux-domain APIs extensions Lu Baolu
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