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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2010-08-26 19:57:59 +0200
committerH. Peter Anvin <hpa@linux.intel.com>2010-08-27 00:13:29 +0200
commitefa631c26d3bb1162b8f95008801db602217f52b (patch)
treebc2b88fa3a08be9c96b663f37ed425a7b3be15f5 /arch/x86/kernel/pci-swiotlb.c
parentx86, iommu: Add proper dependency sort routine (and sanity check). (diff)
downloadlinux-efa631c26d3bb1162b8f95008801db602217f52b.tar.xz
linux-efa631c26d3bb1162b8f95008801db602217f52b.zip
x86, swiotlb: Simplify SWIOTLB pci_swiotlb_detect routine.
In 'pci_swiotlb_detect' we used to do two different things: a). If user provided 'iommu=soft' or 'swiotlb=force' we would set swiotlb=1 and return 1 (and forcing pci-dma.c to call pci_swiotlb_init() immediately). b). If 4GB or more would be detected and if user did not specify iommu=off, we would set 'swiotlb=1' and return whatever 'a)' figured out. We simplify this by splitting a) and b) in two different routines. CC: Fujita Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> LKML-Reference: <1282845485-8991-5-git-send-email-konrad.wilk@oracle.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/pci-swiotlb.c')
-rw-r--r--arch/x86/kernel/pci-swiotlb.c33
1 files changed, 27 insertions, 6 deletions
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index a5bc528d4328..c7a72faeb146 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -41,24 +41,33 @@ static struct dma_map_ops swiotlb_dma_ops = {
};
/*
- * pci_swiotlb_detect - set swiotlb to 1 if necessary
+ * pci_swiotlb_detect_override - set swiotlb to 1 if necessary
*
* This returns non-zero if we are forced to use swiotlb (by the boot
* option).
*/
-int __init pci_swiotlb_detect(void)
+int __init pci_swiotlb_detect_override(void)
{
int use_swiotlb = swiotlb | swiotlb_force;
+ if (swiotlb_force)
+ swiotlb = 1;
+
+ return use_swiotlb;
+}
+
+/*
+ * if 4GB or more detected (and iommu=off not set) return 1
+ * and set swiotlb to 1.
+ */
+int __init pci_swiotlb_detect_4gb(void)
+{
/* don't initialize swiotlb if iommu=off (no_iommu=1) */
#ifdef CONFIG_X86_64
if (!no_iommu && max_pfn > MAX_DMA32_PFN)
swiotlb = 1;
#endif
- if (swiotlb_force)
- swiotlb = 1;
-
- return use_swiotlb;
+ return swiotlb;
}
void __init pci_swiotlb_init(void)
@@ -68,3 +77,15 @@ void __init pci_swiotlb_init(void)
dma_ops = &swiotlb_dma_ops;
}
}
+
+void __init pci_swiotlb_late_init(void)
+{
+ /* An IOMMU turned us off. */
+ if (!swiotlb)
+ swiotlb_free();
+ else {
+ printk(KERN_INFO "PCI-DMA: "
+ "Using software bounce buffering for IO (SWIOTLB)\n");
+ swiotlb_print_info();
+ }
+}