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| author | Muli Ben-Yehuda <muli@il.ibm.com> | 2006-12-07 01:14:07 (GMT) |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 01:14:07 (GMT) |
| commit | bff6547bb6a4e82c399d74e7fba78b12d2f162ed (patch) | |
| tree | faeb4e95d243b0eb5cd6337739e4c14d154b282f /arch/x86_64 | |
| parent | eae93755540bae18aff46b8a0e621b5d65bd5380 (diff) | |
| download | linux-bff6547bb6a4e82c399d74e7fba78b12d2f162ed.tar.xz | |
[PATCH] Calgary: allow compiling Calgary in but not using it by default
This patch makes it possible to compile Calgary in but not use it by
default. In this mode, use 'iommu=calgary' to activate it.
Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64')
| -rw-r--r-- | arch/x86_64/Kconfig | 11 | ||||
| -rw-r--r-- | arch/x86_64/kernel/pci-calgary.c | 9 | ||||
| -rw-r--r-- | arch/x86_64/kernel/pci-dma.c | 5 |
3 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index 010d226..5cb509d 100644 --- a/arch/x86_64/Kconfig +++ b/arch/x86_64/Kconfig @@ -455,6 +455,17 @@ config CALGARY_IOMMU Normally the kernel will make the right choice by itself. If unsure, say Y. +config CALGARY_IOMMU_ENABLED_BY_DEFAULT + bool "Should Calgary be enabled by default?" + default y + depends on CALGARY_IOMMU + help + Should Calgary be enabled by default? if you choose 'y', Calgary + will be used (if it exists). If you choose 'n', Calgary will not be + used even if it exists. If you choose 'n' and would like to use + Calgary anyway, pass 'iommu=calgary' on the kernel command line. + If unsure, say Y. + # need this always selected by IOMMU for the VIA workaround config SWIOTLB bool diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c index 8a1e4f3..0ddf29d 100644 --- a/arch/x86_64/kernel/pci-calgary.c +++ b/arch/x86_64/kernel/pci-calgary.c @@ -43,6 +43,12 @@ #include <asm/dma.h> #include <asm/rio.h> +#ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT +int use_calgary __read_mostly = 1; +#else +int use_calgary __read_mostly = 0; +#endif /* CONFIG_CALGARY_DEFAULT_ENABLED */ + #define PCI_DEVICE_ID_IBM_CALGARY 0x02a1 #define PCI_VENDOR_DEVICE_ID_CALGARY \ (PCI_VENDOR_ID_IBM | PCI_DEVICE_ID_IBM_CALGARY << 16) @@ -1061,6 +1067,9 @@ void __init detect_calgary(void) if (swiotlb || no_iommu || iommu_detected) return; + if (!use_calgary) + return; + if (!early_pci_allowed()) return; diff --git a/arch/x86_64/kernel/pci-dma.c b/arch/x86_64/kernel/pci-dma.c index f8d8574..683b7a5 100644 --- a/arch/x86_64/kernel/pci-dma.c +++ b/arch/x86_64/kernel/pci-dma.c @@ -296,6 +296,11 @@ __init int iommu_setup(char *p) gart_parse_options(p); #endif +#ifdef CONFIG_CALGARY_IOMMU + if (!strncmp(p, "calgary", 7)) + use_calgary = 1; +#endif /* CONFIG_CALGARY_IOMMU */ + p += strcspn(p, ","); if (*p == ',') ++p; |