Messages in this thread Patch in this message | | | Date | Thu, 30 Apr 2009 17:57:11 -0700 | From | Fenghua Yu <> | Subject | Re: [PATCH] Intel IOMMU Pass Through Support |
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On Thu, Apr 30, 2009 at 05:00:34PM -0700, Andrew Morton wrote: > On Thu, 30 Apr 2009 16:37:52 -0700 > Randy Dunlap <rdunlap@xenotime.net> wrote: > > > > > > > arch/x86/built-in.o: In function `iommu_setup': > > > arch/x86/kernel/pci-dma.c:215: undefined reference to `iommu_pass_through' > > > arch/x86/built-in.o: In function `pci_swiotlb_init': > > > arch/x86/kernel/pci-swiotlb.c:74: undefined reference to `iommu_pass_through' > > > > > > Because iommu_pass_through is defined in drivers/pci/intel-iommu.c and > > > > > > # CONFIG_DMAR is not set > > > > > > I'll need to cook up some local hack to work around that. > > > > > > > Patch just went to linux-next mailing list (but should have also > > gone to lkml): > > > > http://marc.info/?l=linux-next&m=124113213400748&w=2 > > OK, thanks. My linux-next feed seems to have broken. > > That patch modifies > > arch/ia64/kernel/dma-mapping.c > arch/x86/kernel/pci-dma.c > > but it would be more logical to modify > > arch/ia64/kernel/pci-dma.c > arch/x86/kernel/pci-dma.c > > is there a reason why that cannot be done?
No particular reason. I just follow iommu_detected definition which is arch/ia64 kernel/dma-mapping.c.
Now I updated the compiling error fix patch as follows:
This updated patch should fix the compiling errors and remove the extern iommu_pass_through from drivers/pci/intel-iommu.c file.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
arch/ia64/kernel/pci-dma.c | 2 ++ arch/x86/kernel/pci-dma.c | 4 ++-- drivers/pci/intel-iommu.c | 1 - 3 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c index eb98738..ecdde25 100644 --- a/arch/ia64/kernel/pci-dma.c +++ b/arch/ia64/kernel/pci-dma.c @@ -32,6 +32,8 @@ int force_iommu __read_mostly = 1; int force_iommu __read_mostly; #endif +int iommu_pass_through; + /* Dummy device used for NULL arguments (normally ISA). Better would be probably a smaller DMA mask, but this is bug-to-bug compatible to i386. */ diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 8cad0d8..049005e 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -32,6 +32,8 @@ int no_iommu __read_mostly; /* Set this to 1 if there is a HW IOMMU in the system */ int iommu_detected __read_mostly = 0; +int iommu_pass_through; + dma_addr_t bad_dma_address __read_mostly = 0; EXPORT_SYMBOL(bad_dma_address); @@ -160,8 +162,6 @@ again: return page_address(page); } -extern int iommu_pass_through; - /* * See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter * documentation. diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index d3ac5e5..66a9cba 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -288,7 +288,6 @@ int dmar_disabled = 1; static int __initdata dmar_map_gfx = 1; static int dmar_forcedac; static int intel_iommu_strict; -int iommu_pass_through; #define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1)) static DEFINE_SPINLOCK(device_domain_lock);
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