linux-kernel - [PATCH v2 2/8] iommu: Add attach/detach_dev

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Date:   Mon, 14 Mar 2022 22:07:06 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Christoph Hellwig" <hch@...radead.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     Jacob Pan <jacob.jun.pan@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>
Subject: [PATCH v2 2/8] iommu: Add attach/detach_dev_pasid domain ops

From: Lu Baolu <baolu.lu@...ux.intel.com>

An IOMMU domain represents an address space which can be attached by
devices that perform DMA within a domain. However, for platforms with
PASID capability the domain attachment needs be handled at device+PASID
level. There can be multiple PASIDs within a device and multiple devices
attached to a given domain.
This patch introduces a new IOMMU op which support device, PASID, and
IOMMU domain attachment. The immediate use case is for PASID capable
devices to perform DMA under DMA APIs.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 include/linux/iommu.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 369f05c2a4e2..fde5b933dbe3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -227,6 +227,8 @@ struct iommu_iotlb_gather {
  * @aux_get_pasid: get the pasid given an aux-domain
  * @sva_bind: Bind process address space to device
  * @sva_unbind: Unbind process address space from device
+ * @attach_dev_pasid: attach an iommu domain to a pasid of device
+ * @detach_dev_pasid: detach an iommu domain from a pasid of device
  * @sva_get_pasid: Get PASID associated to a SVA handle
  * @page_response: handle page request response
  * @cache_invalidate: invalidate translation caches
@@ -296,6 +298,10 @@ struct iommu_ops {
 	struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
 				      void *drvdata);
 	void (*sva_unbind)(struct iommu_sva *handle);
+	int (*attach_dev_pasid)(struct iommu_domain *domain,
+				struct device *dev, ioasid_t id);
+	void (*detach_dev_pasid)(struct iommu_domain *domain,
+				 struct device *dev, ioasid_t id);
 	u32 (*sva_get_pasid)(struct iommu_sva *handle);
 
 	int (*page_response)(struct device *dev,
-- 
2.25.1