From: Joerg Roedel <joerg.roedel@amd.com>
Date: Thu, 10 Dec 2009 10:03:39 +0000 (+0100)
Subject: x86/amd-iommu: Fix passthrough mode
X-Git-Tag: v3.0~6183^2~58^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b7cc9554bc73641c9ed4d7eb74b2d6e78f20abea;p=platform%2Fkernel%2Flinux-amlogic.git

x86/amd-iommu: Fix passthrough mode

The data structure changes to use dev->archdata.iommu field
broke the iommu=pt mode because in this case the
dev->archdata.iommu was left uninitialized. This moves the
inititalization of the devices into the main init function
and fixes the problem.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---

diff --git a/arch/x86/include/asm/amd_iommu_proto.h b/arch/x86/include/asm/amd_iommu_proto.h
index 84786fb..2566e26 100644
--- a/arch/x86/include/asm/amd_iommu_proto.h
+++ b/arch/x86/include/asm/amd_iommu_proto.h
@@ -28,7 +28,8 @@ extern void amd_iommu_flush_all_domains(void);
 extern void amd_iommu_flush_all_devices(void);
 extern void amd_iommu_apply_erratum_63(u16 devid);
 extern void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu);
-
+extern int amd_iommu_init_devices(void);
+extern void amd_iommu_uninit_devices(void);
 #ifndef CONFIG_AMD_IOMMU_STATS
 
 static inline void amd_iommu_stats_init(void) { }
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 32fb091..450dd6a 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -166,6 +166,43 @@ static void iommu_uninit_device(struct device *dev)
 {
 	kfree(dev->archdata.iommu);
 }
+
+void __init amd_iommu_uninit_devices(void)
+{
+	struct pci_dev *pdev = NULL;
+
+	for_each_pci_dev(pdev) {
+
+		if (!check_device(&pdev->dev))
+			continue;
+
+		iommu_uninit_device(&pdev->dev);
+	}
+}
+
+int __init amd_iommu_init_devices(void)
+{
+	struct pci_dev *pdev = NULL;
+	int ret = 0;
+
+	for_each_pci_dev(pdev) {
+
+		if (!check_device(&pdev->dev))
+			continue;
+
+		ret = iommu_init_device(&pdev->dev);
+		if (ret)
+			goto out_free;
+	}
+
+	return 0;
+
+out_free:
+
+	amd_iommu_uninit_devices();
+
+	return ret;
+}
 #ifdef CONFIG_AMD_IOMMU_STATS
 
 /*
@@ -2145,8 +2182,6 @@ static void prealloc_protection_domains(void)
 		if (!check_device(&dev->dev))
 			continue;
 
-		iommu_init_device(&dev->dev);
-
 		/* Is there already any domain for it? */
 		if (domain_for_device(&dev->dev))
 			continue;
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 7ffc399..df01c69 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -1274,6 +1274,10 @@ static int __init amd_iommu_init(void)
 	if (ret)
 		goto free;
 
+	ret = amd_iommu_init_devices();
+	if (ret)
+		goto free;
+
 	if (iommu_pass_through)
 		ret = amd_iommu_init_passthrough();
 	else
@@ -1296,6 +1300,9 @@ out:
 	return ret;
 
 free:
+
+	amd_iommu_uninit_devices();
+
 	free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
 		   get_order(MAX_DOMAIN_ID/8));