From: Jon Mason <jdmason@us.ibm.com>
Date: Fri, 3 Feb 2006 20:51:59 +0000 (+0100)
Subject: [PATCH] x86_64: IOMMU printk cleanup
X-Git-Tag: v3.12-rc1~38640
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5b7b644ca9a12396a46fad825a973fb8bed17102;p=kernel%2Fkernel-generic.git

[PATCH] x86_64: IOMMU printk cleanup

This patch contains a printk reorder to remove the current problem of
displaying "PCI-DMA: Disabling IOMMU." and then "PCI-DMA: using GART
IOMMU" 20 lines later in dmesg.

It also constains a printk reorder in swiotlb to state swiotlb
enablement prior to describing the location of the bounce buffers, and a
printk reorder to state gart enablement prior to describing the
aperature.

Also constains a whitespace cleanup in arch/x86_64/kernel/setup.c

Tested (along with patch 2/2) on dual opteron with gart enabled,
iommu=soft, and iommu=off.

Signed-off-by: Jon Mason <jdmason@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index 9188b25f..2fe23a6 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -645,9 +645,18 @@ static int __init pci_iommu_init(void)
 	    (no_agp && init_k8_gatt(&info) < 0)) {
 		no_iommu = 1;
 		no_iommu_init();
+		printk(KERN_INFO "PCI-DMA: Disabling IOMMU.\n");
+		if (end_pfn > MAX_DMA32_PFN) {
+			printk(KERN_ERR "WARNING more than 4GB of memory "
+					"but IOMMU not compiled in.\n"
+			       KERN_ERR "WARNING 32bit PCI may malfunction.\n"
+			       KERN_ERR "You might want to enable "
+					"CONFIG_GART_IOMMU\n");
+		}
 		return -1;
 	}
 
+	printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
 	aper_size = info.aper_size * 1024 * 1024;	
 	iommu_size = check_iommu_size(info.aper_base, aper_size); 
 	iommu_pages = iommu_size >> PAGE_SHIFT; 
@@ -721,7 +730,6 @@ static int __init pci_iommu_init(void)
 		     
 	flush_gart(NULL);
 
-	printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
 	dma_ops = &gart_dma_ops;
 
 	return 0;
diff --git a/arch/x86_64/kernel/pci-nommu.c b/arch/x86_64/kernel/pci-nommu.c
index e415649..44adcc2 100644
--- a/arch/x86_64/kernel/pci-nommu.c
+++ b/arch/x86_64/kernel/pci-nommu.c
@@ -88,12 +88,5 @@ void __init no_iommu_init(void)
 {
 	if (dma_ops)
 		return;
-	printk(KERN_INFO "PCI-DMA: Disabling IOMMU.\n");
 	dma_ops = &nommu_dma_ops;
-	if (end_pfn > MAX_DMA32_PFN) {
-		printk(KERN_ERR
-		       "WARNING more than 4GB of memory but IOMMU not compiled in.\n"
-		       KERN_ERR "WARNING 32bit PCI may malfunction.\n"
-		       KERN_ERR "You might want to enable CONFIG_GART_IOMMU\n");
-	}
 }
diff --git a/arch/x86_64/kernel/pci-swiotlb.c b/arch/x86_64/kernel/pci-swiotlb.c
index 3569a25..990ed67 100644
--- a/arch/x86_64/kernel/pci-swiotlb.c
+++ b/arch/x86_64/kernel/pci-swiotlb.c
@@ -35,8 +35,8 @@ void pci_swiotlb_init(void)
 	    (end_pfn > MAX_DMA32_PFN || force_iommu))
 	       swiotlb = 1;
 	if (swiotlb) {
-		swiotlb_init();
 		printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
+		swiotlb_init();
 		dma_ops = &swiotlb_dma_ops;
 	}
 }
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 506f152..363db5a 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -741,7 +741,7 @@ void __init setup_arch(char **cmdline_p)
 	e820_setup_gap();
 
 #ifdef CONFIG_GART_IOMMU
-       iommu_hole_init();
+	iommu_hole_init();
 #endif
 
 #ifdef CONFIG_VT