linux-kernel - [PATCH 4/8] xen: Utilize the restore_msi

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Date:	Thu, 29 Sep 2011 16:16:50 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org, rjw@...k.pl, tglx@...utronix.de,
	hpa@...or.com, x86@...nel.org, len.brown@...el.com,
	joseph.cihula@...el.com, shane.wang@...el.com,
	xen-devel@...ts.xensource.com, linux-pm@...ts.linux-foundation.org,
	tboot-devel@...ts.sourceforge.net, linux-acpi@...r.kernel.org,
	liang.tang@...cle.com, ke.yu@...el.com, kevin.tian@...el.com,
	jeremy@...p.org
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 4/8] xen: Utilize the restore_msi_irqs hook.

to make a hypercall to restore the vectors in the MSI/MSI-X
configuration space.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 arch/x86/pci/xen.c              |   12 ++++++++++++
 include/xen/interface/physdev.h |    7 +++++++
 2 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 1017c7b..9eea4ed 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -304,6 +304,17 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 out:
 	return ret;
 }
+
+static void xen_initdom_restore_msi_irqs(struct pci_dev *dev, int irq)
+{
+	int ret = 0;
+	struct physdev_restore_msi restore;
+
+	restore.bus = dev->bus->number;
+	restore.devfn = dev->devfn;
+	ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
+	WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
+}
 #endif
 
 static void xen_teardown_msi_irqs(struct pci_dev *dev)
@@ -426,6 +437,7 @@ int __init pci_xen_initial_domain(void)
 #ifdef CONFIG_PCI_MSI
 	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
 	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
+	x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
 #endif
 	xen_setup_acpi_sci();
 	__acpi_register_gsi = acpi_register_gsi_xen;
diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h
index 534cac8..44aefa9 100644
--- a/include/xen/interface/physdev.h
+++ b/include/xen/interface/physdev.h
@@ -144,6 +144,13 @@ struct physdev_manage_pci {
 	uint8_t devfn;
 };
 
+#define PHYSDEVOP_restore_msi            19
+struct physdev_restore_msi {
+	/* IN */
+	uint8_t bus;
+	uint8_t devfn;
+};
+
 #define PHYSDEVOP_manage_pci_add_ext	20
 struct physdev_manage_pci_ext {
 	/* IN */
-- 
1.7.4.1

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