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authorJoerg Roedel <joerg.roedel@amd.com>2008-12-10 20:27:25 +0300
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 16:11:55 +0300
commite275a2a0fc9e2168b15f6c7814e30b7ad58b1c7c (patch)
treed9cb9771b53c0d631497eb248667c56e1a6a6deb /arch
parent355bf553edb7fe21ada51f62c849180bec6da877 (diff)
downloadlinux-e275a2a0fc9e2168b15f6c7814e30b7ad58b1c7c.tar.xz
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/amd_iommu.c62
1 files changed, 60 insertions, 2 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 15456a3a18c8..140875b3f6ef 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -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: