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PCI / Intel IOMMU: Use syscore_ops instead of sysdev class and sysdev 

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>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Rafael J. Wysocki 2011-03-23 22:16:14 +01:00
parent e1a85b2c51
commit 134fac3f45
1 changed files with 9 additions and 29 deletions
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38
drivers/pci/intel-iommu.c
View File

@ -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_device *dev)
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_device *dev)
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);