commit 5fc24d8cb9d43e0db335137051092da03a6845dc
author Yijing Wang <wangyijing@huawei.com> Wed Sep 17 17:32:19 2014 +0800
committer Joerg Roedel <jroedel@suse.de> Thu Sep 25 19:11:47 2014 +0200
tree c476b207814a1409d74fffe7b0837ef372dc7f9a
parent fb3e306515ba6a012364b698b8ca71c337424ed3

iommu/irq_remapping: Fix the regression of hpet irq remapping

Commit 71054d8841b4 ("x86, hpet: Introduce x86_msi_ops.setup_hpet_msi")
introduced x86_msi_ops.setup_hpet_msi to setup hpet MSI irq
when irq remapping enabled. This caused a regression of
hpet MSI irq remapping.

Original code flow before commit 71054d8841b4:
hpet_setup_msi_irq()
	arch_setup_hpet_msi()
		setup_hpet_msi_remapped()
			remap_ops->setup_hpet_msi()
				alloc_irte()
		msi_compose_msg()
		hpet_msi_write()
		...

Current code flow after commit 71054d8841b4:
hpet_setup_msi_irq()
	x86_msi.setup_hpet_msi()
		setup_hpet_msi_remapped()
			intel_setup_hpet_msi()
				alloc_irte()

Currently, we only call alloc_irte() for hpet MSI, but
do not composed and wrote its msg...

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/irq_remapping.c

diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 33c43952..74a1767 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -12,6 +12,7 @@
 #include <asm/processor.h>
 #include <asm/x86_init.h>
 #include <asm/apic.h>
+#include <asm/hpet.h>
 
 #include "irq_remapping.h"
 
@@ -345,10 +346,16 @@
 
 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 {
-	if (!remap_ops || !remap_ops->setup_hpet_msi)
+	int ret;
+
+	if (!remap_ops || !remap_ops->alloc_hpet_msi)
 		return -ENODEV;
 
-	return remap_ops->setup_hpet_msi(irq, id);
+	ret = remap_ops->alloc_hpet_msi(irq, id);
+	if (ret)
+		return -EINVAL;
+
+	return default_setup_hpet_msi(irq, id);
 }
 
 void panic_if_irq_remap(const char *msg)