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AMD IOMMU: add device notifier callback 

Impact: inform IOMMU about state change of a device in the driver core

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-10 18:27:25 +01:00
parent 355bf553ed
commit e275a2a0fc
1 changed files with 60 additions and 2 deletions
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62
arch/x86/kernel/amd_iommu.c
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@ -47,6 +47,8 @@ struct iommu_cmd {
static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
struct unity_map_entry *e);
static struct dma_ops_domain *find_protection_domain(u16 devid);
/* returns !0 if the IOMMU is caching non-present entries in its TLB */
static int iommu_has_npcache(struct amd_iommu *iommu)
@ -844,7 +846,6 @@ static void attach_device(struct amd_iommu *iommu,
iommu_queue_inv_dev_entry(iommu, devid);
}
#ifdef CONFIG_IOMMU_API
/*
* Removes a device from a protection domain (unlocked)
*/
@ -881,7 +882,62 @@ static void detach_device(struct protection_domain *domain, u16 devid)
__detach_device(domain, devid);
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
}
#endif
static int device_change_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
struct pci_dev *pdev = to_pci_dev(dev);
u16 devid = calc_devid(pdev->bus->number, pdev->devfn);
struct protection_domain *domain;
struct dma_ops_domain *dma_domain;
struct amd_iommu *iommu;
if (devid > amd_iommu_last_bdf)
goto out;
devid = amd_iommu_alias_table[devid];
iommu = amd_iommu_rlookup_table[devid];
if (iommu == NULL)
goto out;
domain = domain_for_device(devid);
if (domain && !dma_ops_domain(domain))
WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound "
"to a non-dma-ops domain\n", dev_name(dev));
switch (action) {
case BUS_NOTIFY_BOUND_DRIVER:
if (domain)
goto out;
dma_domain = find_protection_domain(devid);
if (!dma_domain)
dma_domain = iommu->default_dom;
attach_device(iommu, &dma_domain->domain, devid);
printk(KERN_INFO "AMD IOMMU: Using protection domain %d for "
"device %s\n", dma_domain->domain.id, dev_name(dev));
break;
case BUS_NOTIFY_UNBIND_DRIVER:
if (!domain)
goto out;
detach_device(domain, devid);
break;
default:
goto out;
}
iommu_queue_inv_dev_entry(iommu, devid);
iommu_completion_wait(iommu);
out:
return 0;
}
struct notifier_block device_nb = {
.notifier_call = device_change_notifier,
};
/*****************************************************************************
*
@ -1510,6 +1566,8 @@ int __init amd_iommu_init_dma_ops(void)
/* Make the driver finally visible to the drivers */
dma_ops = &amd_iommu_dma_ops;
bus_register_notifier(&pci_bus_type, &device_nb);
return 0;
free_domains: