linux-kernel - [RFC PATCH v5 2/5] iommu: Set IOMMU_GROUP_CAP_ISOLATE_MSIX if MSI controller enables IRQ remapping

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Date:   Mon,  7 Aug 2017 17:25:45 +1000
From:   Alexey Kardashevskiy <aik@...abs.ru>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     Alexey Kardashevskiy <aik@...abs.ru>,
        David Gibson <david@...son.dropbear.id.au>,
        kvm-ppc@...r.kernel.org, kvm@...r.kernel.org,
        Yongji Xie <elohimes@...il.com>,
        Eric Auger <eric.auger@...hat.com>,
        Kyle Mahlkuch <Kyle.Mahlkuch@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jike Song <jike.song@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
        Neo Jia <cjia@...dia.com>, Paul Mackerras <paulus@...ba.org>,
        Vlad Tsyrklevich <vlad@...rklevich.net>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v5 2/5] iommu: Set IOMMU_GROUP_CAP_ISOLATE_MSIX if MSI controller enables IRQ remapping

This sets IOMMU_GROUP_CAP_ISOLATE_MSIX to a group if MSI remapping is
enabled on an IRQ domain; this is expected to set the capability
on ARM.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
---
 drivers/iommu/iommu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 6b2c34fe2c3d..e720e90fa93c 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -32,6 +32,7 @@
 #include <linux/pci.h>
 #include <linux/bitops.h>
 #include <linux/property.h>
+#include <linux/irqdomain.h>
 #include <trace/events/iommu.h>
 
 static struct kset *iommu_group_kset;
@@ -1028,6 +1029,7 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
 	struct iommu_group *group;
 	int ret;
+	struct irq_domain *d = dev_get_msi_domain(dev);
 
 	group = iommu_group_get(dev);
 	if (group)
@@ -1070,6 +1072,11 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
 		return ERR_PTR(ret);
 	}
 
+	if (d && irq_domain_is_msi(d) &&
+			irq_domain_hierarchical_is_msi_remap(d))
+		iommu_group_set_caps(group, 0,
+				IOMMU_GROUP_CAP_ISOLATE_MSIX);
+
 	return group;
 }
 
-- 
2.11.0