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Subject[PATCH 5/8] PCI / Intel IOMMU: Use syscore_ops instead of sysdev class and sysdev
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

The Intel IOMMU subsystem uses a sysdev class and a sysdev for
executing iommu_suspend() after interrupts have been turned off
on the boot CPU (during system suspend) and for executing
iommu_resume() before turning on interrupts on the boot CPU
(during system resume). However, since both of these functions
ignore their arguments, the entire mechanism may be replaced with a
struct syscore_ops object which is simpler.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/pci/intel-iommu.c | 38 +++++++++-----------------------------
1 file changed, 9 insertions(+), 29 deletions(-)
Index: linux-2.6/drivers/pci/intel-iommu.c
===================================================================
--- linux-2.6.orig/drivers/pci/intel-iommu.c
+++ linux-2.6/drivers/pci/intel-iommu.c
@@ -36,7 +36,7 @@
#include <linux/iova.h>
#include <linux/iommu.h>
#include <linux/intel-iommu.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
#include <linux/tboot.h>
#include <linux/dmi.h>
#include <asm/cacheflush.h>
@@ -3135,7 +3135,7 @@ static void iommu_flush_all(void)
}
}

-static int iommu_suspend(struct sys_device *dev, pm_message_t state)
+static int iommu_suspend(void)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu = NULL;
@@ -3175,7 +3175,7 @@ nomem:
return -ENOMEM;
}

-static int iommu_resume(struct sys_device *dev)
+static void iommu_resume(void)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu = NULL;
@@ -3183,7 +3183,7 @@ static int iommu_resume(struct sys_devic

if (init_iommu_hw()) {
WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
- return -EIO;
+ return;
}

for_each_active_iommu(iommu, drhd) {
@@ -3204,40 +3204,20 @@ static int iommu_resume(struct sys_devic

for_each_active_iommu(iommu, drhd)
kfree(iommu->iommu_state);
-
- return 0;
}

-static struct sysdev_class iommu_sysclass = {
- .name = "iommu",
+static struct syscore_ops iommu_syscore_ops = {
.resume = iommu_resume,
.suspend = iommu_suspend,
};

-static struct sys_device device_iommu = {
- .cls = &iommu_sysclass,
-};
-
-static int __init init_iommu_sysfs(void)
+static void __init init_iommu_pm_ops(void)
{
- int error;
-
- error = sysdev_class_register(&iommu_sysclass);
- if (error)
- return error;
-
- error = sysdev_register(&device_iommu);
- if (error)
- sysdev_class_unregister(&iommu_sysclass);
-
- return error;
+ register_syscore_ops(&iommu_syscore_ops);
}

#else
-static int __init init_iommu_sysfs(void)
-{
- return 0;
-}
+static inline int init_iommu_pm_ops(void) { }
#endif /* CONFIG_PM */

/*
@@ -3320,7 +3300,7 @@ int __init intel_iommu_init(void)
#endif
dma_ops = &intel_dma_ops;

- init_iommu_sysfs();
+ init_iommu_pm_ops();

register_iommu(&intel_iommu_ops);



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