linux-kernel - [PATCH 3/3] device_isolation: Support isolation on POWER p7ioc (IODA) bridges

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Date:	Wed,  1 Feb 2012 15:46:54 +1100
From:	David Gibson <david@...son.dropbear.id.au>
To:	dwmw2@...radead.org, iommu@...ts.linux-foundation.org
Cc:	aik@...abs.ru, benh@...nel.crashing.org, qemu-devel@...gnu.org,
	alex.williamson@...hat.com, joerg.roedel@....com,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] device_isolation: Support isolation on POWER p7ioc (IODA) bridges

This patch adds code to the code for the powernv platform to create
and populate isolation groups on hardware using the p7ioc (aka IODA) PCI host
bridge used on some IBM POWER systems.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
Signed-off-by: David Gibson <david@...son.dropbear.id.au>
---
 arch/powerpc/platforms/powernv/pci-ioda.c |   18 ++++++++++++++++--
 arch/powerpc/platforms/powernv/pci.h      |    6 ++++++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 5e155df..4648475 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -20,6 +20,7 @@
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/msi.h>
+#include <linux/device_isolation.h>
 
 #include <asm/sections.h>
 #include <asm/io.h>
@@ -877,6 +878,9 @@ static void __devinit pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe,
 		set_iommu_table_base(&dev->dev, &pe->tce32_table);
 		if (dev->subordinate)
 			pnv_ioda_setup_bus_dma(pe, dev->subordinate);
+#ifdef CONFIG_DEVICE_ISOLATION
+		device_isolation_dev_add(&pe->di_group, &dev->dev);
+#endif
 	}
 }
 
@@ -957,11 +961,21 @@ static void __devinit pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
 	}
 	iommu_init_table(tbl, phb->hose->node);
 
-	if (pe->pdev)
+#ifdef CONFIG_DEVICE_ISOLATION
+	BUG_ON(device_isolation_group_init(&pe->di_group, "ioda:rid%x-pe%x",
+					   pe->rid, pe->pe_number) < 0);
+#endif
+
+	if (pe->pdev) {
 		set_iommu_table_base(&pe->pdev->dev, tbl);
-	else
+#ifdef CONFIG_DEVICE_ISOLATION
+		device_isolation_dev_add(&pe->di_group, &pe->pdev->dev);
+#endif
+	} else
 		pnv_ioda_setup_bus_dma(pe, pe->pbus);
 
+
+
 	return;
  fail:
 	/* XXX Failure: Try to fallback to 64-bit only ? */
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index 64ede1e..3e282b7 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -1,6 +1,8 @@
 #ifndef __POWERNV_PCI_H
 #define __POWERNV_PCI_H
 
+#include <linux/device_isolation.h>
+
 struct pci_dn;
 
 enum pnv_phb_type {
@@ -60,6 +62,10 @@ struct pnv_ioda_pe {
 
 	/* Link in list of PE#s */
 	struct list_head	link;
+
+#ifdef CONFIG_DEVICE_ISOLATION
+	struct device_isolation_group di_group;
+#endif
 };
 
 struct pnv_phb {
-- 
1.7.8.3

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