This should ease finding similarities with different platforms,
with the intention of solving problems once in a generic framework
which everyone can use.
Note: to move intel-iommu.c, the declaration of pci_find_upstream_pcie_bridge()
has to move from drivers/pci/pci.h to include/linux/pci.h. This is handled
in this patch, too.
As suggested, also drop DMAR's EXPERIMENTAL tag while we're at it.
Compile-tested on x86_64.
Signed-off-by: Ohad Ben-Cohen <ohad@xxxxxxxxxx>
---
sorry, not tested on ia64 (not even compiled)
arch/ia64/Kconfig | 21 -------------
arch/x86/Kconfig | 50 -------------------------------
drivers/iommu/Kconfig | 49 ++++++++++++++++++++++++++++++
drivers/iommu/Makefile | 2 +
drivers/{pci => iommu}/dmar.c | 0
drivers/{pci => iommu}/intel-iommu.c | 1 -
drivers/{pci => iommu}/intr_remapping.c | 1 -
drivers/{pci => iommu}/intr_remapping.h | 0
drivers/{pci => iommu}/iova.c | 0
drivers/pci/Makefile | 5 ---
drivers/pci/pci.h | 2 -
include/linux/pci.h | 11 +++++++
12 files changed, 62 insertions(+), 80 deletions(-)
rename drivers/{pci => iommu}/dmar.c (100%)
rename drivers/{pci => iommu}/intel-iommu.c (99%)
rename drivers/{pci => iommu}/intr_remapping.c (99%)
rename drivers/{pci => iommu}/intr_remapping.h (100%)
rename drivers/{pci => iommu}/iova.c (100%)
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 9929e4e..7336ba6 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -627,27 +627,6 @@ source "drivers/pci/hotplug/Kconfig"
source "drivers/pcmcia/Kconfig"
-config DMAR
- bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
- depends on IA64_GENERIC && ACPI && EXPERIMENTAL
- help
- DMA remapping (DMAR) devices support enables independent address
- translations for Direct Memory Access (DMA) from devices.
- These DMA remapping devices are reported via ACPI tables
- and include PCI device scope covered by these DMA
- remapping devices.
-
-config DMAR_DEFAULT_ON
- def_bool y
- prompt "Enable DMA Remapping Devices by default"
- depends on DMAR
- help
- Selecting this option will enable a DMAR device at boot time if
- one is found. If this option is not selected, DMAR support can
- be enabled by passing intel_iommu=on to the kernel. It is
- recommended you say N here while the DMAR code remains
- experimental.
-
endmenu
endif
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1b6a2e2..a169573 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1912,56 +1912,6 @@ config PCI_CNB20LE_QUIRK
You should say N unless you know you need this.
-config DMAR
- bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
- depends on PCI_MSI && ACPI && EXPERIMENTAL
- select IOMMU_API
- help
- DMA remapping (DMAR) devices support enables independent address
- translations for Direct Memory Access (DMA) from devices.
- These DMA remapping devices are reported via ACPI tables
- and include PCI device scope covered by these DMA
- remapping devices.
-
-config DMAR_DEFAULT_ON
- def_bool y
- prompt "Enable DMA Remapping Devices by default"
- depends on DMAR
- help
- Selecting this option will enable a DMAR device at boot time if
- one is found. If this option is not selected, DMAR support can
- be enabled by passing intel_iommu=on to the kernel. It is
- recommended you say N here while the DMAR code remains
- experimental.
-
-config DMAR_BROKEN_GFX_WA
- bool "Workaround broken graphics drivers (going away soon)"
- depends on DMAR && BROKEN
- ---help---
- Current Graphics drivers tend to use physical address
- for DMA and avoid using DMA APIs. Setting this config
- option permits the IOMMU driver to set a unity map for
- all the OS-visible memory. Hence the driver can continue
- to use physical addresses for DMA, at least until this
- option is removed in the 2.6.32 kernel.
-
-config DMAR_FLOPPY_WA
- def_bool y
- depends on DMAR
- ---help---
- Floppy disk drivers are known to bypass DMA API calls
- thereby failing to work when IOMMU is enabled. This
- workaround will setup a 1:1 mapping for the first
- 16MiB to make floppy (an ISA device) work.
-
-config INTR_REMAP
- bool "Support for Interrupt Remapping (EXPERIMENTAL)"
- depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
- ---help---
- Supports Interrupt remapping for IO-APIC and MSI devices.
- To use x2apic mode in the CPU's which support x2APIC enhancements or
- to support platforms with CPU's having > 8 bit APIC ID, say Y.
-
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/Kconfig"
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 9246c5b..e2a5f14 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -46,3 +46,52 @@ config AMD_IOMMU_STATS
statistics about whats happening in the driver and exports that
information to userspace via debugfs.
If unsure, say N.
+
+# Intel IOMMU support
+config DMAR
+ bool "Support for DMA Remapping Devices"
+ depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
+ select IOMMU_API
+ help
+ DMA remapping (DMAR) devices support enables independent address
+ translations for Direct Memory Access (DMA) from devices.
+ These DMA remapping devices are reported via ACPI tables
+ and include PCI device scope covered by these DMA
+ remapping devices.
+
+config DMAR_DEFAULT_ON
+ def_bool y
+ prompt "Enable DMA Remapping Devices by default"
+ depends on DMAR
+ help
+ Selecting this option will enable a DMAR device at boot time if
+ one is found. If this option is not selected, DMAR support can
+ be enabled by passing intel_iommu=on to the kernel.
+
+config DMAR_BROKEN_GFX_WA
+ bool "Workaround broken graphics drivers (going away soon)"
+ depends on DMAR && BROKEN && X86
+ ---help---
+ Current Graphics drivers tend to use physical address
+ for DMA and avoid using DMA APIs. Setting this config
+ option permits the IOMMU driver to set a unity map for
+ all the OS-visible memory. Hence the driver can continue
+ to use physical addresses for DMA, at least until this
+ option is removed in the 2.6.32 kernel.
+
+config DMAR_FLOPPY_WA
+ def_bool y
+ depends on DMAR && X86
+ ---help---
+ Floppy disk drivers are known to bypass DMA API calls
+ thereby failing to work when IOMMU is enabled. This
+ workaround will setup a 1:1 mapping for the first
+ 16MiB to make floppy (an ISA device) work.
+
+config INTR_REMAP
+ bool "Support for Interrupt Remapping (EXPERIMENTAL)"
+ depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
+ ---help---
+ Supports Interrupt remapping for IO-APIC and MSI devices.
+ To use x2apic mode in the CPU's which support x2APIC enhancements or
+ to support platforms with CPU's having > 8 bit APIC ID, say Y.
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 4237eaf..49e9c0f 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -1,3 +1,5 @@
obj-$(CONFIG_IOMMU_API) += iommu.o
obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o msm_iommu_dev.o
obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o
+obj-$(CONFIG_DMAR) += dmar.o iova.o intel-iommu.o
+obj-$(CONFIG_INTR_REMAP) += dmar.o intr_remapping.o
diff --git a/drivers/pci/dmar.c b/drivers/iommu/dmar.c
similarity index 100%
rename from drivers/pci/dmar.c
rename to drivers/iommu/dmar.c
diff --git a/drivers/pci/intel-iommu.c b/drivers/iommu/intel-iommu.c
similarity index 99%
rename from drivers/pci/intel-iommu.c
rename to drivers/iommu/intel-iommu.c
index 59f17ac..fd7a055 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -42,7 +42,6 @@
#include <linux/pci-ats.h>
#include <asm/cacheflush.h>
#include <asm/iommu.h>
-#include "pci.h"
#define ROOT_SIZE VTD_PAGE_SIZE
#define CONTEXT_SIZE VTD_PAGE_SIZE
diff --git a/drivers/pci/intr_remapping.c b/drivers/iommu/intr_remapping.c
similarity index 99%
rename from drivers/pci/intr_remapping.c
rename to drivers/iommu/intr_remapping.c
index 3607faf..1a89d4a 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/iommu/intr_remapping.c
@@ -13,7 +13,6 @@
#include "intr_remapping.h"
#include <acpi/acpi.h>
#include <asm/pci-direct.h>
-#include "pci.h"
static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
static struct hpet_scope ir_hpet[MAX_HPET_TBS];
diff --git a/drivers/pci/intr_remapping.h b/drivers/iommu/intr_remapping.h
similarity index 100%
rename from drivers/pci/intr_remapping.h
rename to drivers/iommu/intr_remapping.h
diff --git a/drivers/pci/iova.c b/drivers/iommu/iova.c
similarity index 100%
rename from drivers/pci/iova.c
rename to drivers/iommu/iova.c
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index c85f744..f7739d0 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -29,11 +29,6 @@ obj-$(CONFIG_PCI_MSI) += msi.o
# Build the Hypertransport interrupt support
obj-$(CONFIG_HT_IRQ) += htirq.o
-# Build Intel IOMMU support
-obj-$(CONFIG_DMAR) += dmar.o iova.o intel-iommu.o
-
-obj-$(CONFIG_INTR_REMAP) += dmar.o intr_remapping.o
-
obj-$(CONFIG_PCI_IOV) += iov.o
#
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 731e202..b7bf11d 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -184,8 +184,6 @@ pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
return NULL;
}
-struct pci_dev *pci_find_upstream_pcie_bridge(struct pci_dev *pdev);
-
/* PCI slot sysfs helper code */
#define to_pci_slot(s) container_of(s, struct pci_slot, kobj)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c446b5c..970bfe0 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1589,5 +1589,16 @@ int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt);
int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
unsigned int len, const char *kw);
+/**
+ * pci_find_upstream_pcie_bridge - find upstream PCIe-to-PCI bridge of a device
+ * @pdev: the PCI device
+ *
+ * if the device is PCIE, return NULL
+ * if the device isn't connected to a PCIe bridge (that is its parent is a
+ * legacy PCI bridge and the bridge is directly connected to bus 0), return its
+ * parent
+ */
+struct pci_dev *pci_find_upstream_pcie_bridge(struct pci_dev *pdev);
+
#endif /* __KERNEL__ */
#endif /* LINUX_PCI_H */
--
1.7.1
--
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