linux-kernel - [RFC PATCH 2/5] iommu/vt-d: Initialize a PASID consumer

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Message-Id: <20181112064501.2290-3-baolu.lu@linux.intel.com>
Date:   Mon, 12 Nov 2018 14:44:58 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>
Cc:     ashok.raj@...el.com, sanjay.k.kumar@...el.com,
        jacob.jun.pan@...el.com, kevin.tian@...el.com,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        yi.l.liu@...el.com, yi.y.sun@...el.com, peterx@...hat.com,
        tiwei.bie@...el.com, Zeng Xin <xin.zeng@...el.com>,
        iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [RFC PATCH 2/5] iommu/vt-d: Initialize a PASID consumer

This adds the Intel vt-d specific ops to initialize a PASID
consumer.

Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel-iommu.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 49a278a699b0..769b7059d52f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5597,6 +5597,35 @@ static int intel_iommu_domain_get_attr(struct iommu_domain *domain,
 	return ret;
 }
 
+static int intel_iommu_pasid_init(struct iommu_pasid *pasid)
+{
+	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu = NULL, *temp;
+
+	/*
+	 *  Iterate the iommu units and get a scalable mode capable one
+	 *  for virtual command usages. Return failure if scalable mode
+	 *  doesn't support by any unit.
+	 */
+	rcu_read_lock();
+	for_each_active_iommu(temp, drhd) {
+		if (sm_supported(temp)) {
+			iommu = temp;
+			break;
+		}
+	}
+	rcu_read_unlock();
+
+	if (!iommu)
+		return -ENODEV;
+
+	pasid->max = intel_pasid_max_id;
+	pasid->min = PASID_MIN;
+	pasid->priv = iommu;
+
+	return 0;
+}
+
 const struct iommu_ops intel_iommu_ops = {
 	.capable		= intel_iommu_capable,
 	.domain_alloc		= intel_iommu_domain_alloc,
@@ -5616,6 +5645,7 @@ const struct iommu_ops intel_iommu_ops = {
 	.domain_get_attr	= intel_iommu_domain_get_attr,
 	.get_dev_attr		= intel_iommu_get_dev_attr,
 	.set_dev_attr		= intel_iommu_set_dev_attr,
+	.pasid_init		= intel_iommu_pasid_init,
 	.pgsize_bitmap		= INTEL_IOMMU_PGSIZES,
 };
 
-- 
2.17.1