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kernel-ark/drivers/iommu/Kconfig
Thomas Petazzoni 0dbc6078c0 x86, build, pci: Fix PCI_MSI build on !SMP 
Commit ebd97be635 ('PCI: remove ARCH_SUPPORTS_MSI kconfig option')
removed the ARCH_SUPPORTS_MSI option which architectures could select
to indicate that they support MSI. Now, all architectures are supposed
to build fine when MSI support is enabled: instead of having the
architecture tell *when* MSI support can be used, it's up to the
architecture code to ensure that MSI support can be enabled.

On x86, commit ebd97be635 removed the following line:

  select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)

Which meant that MSI support was only available when the local APIC
and I/O APIC were enabled. While this is always true on SMP or x86-64,
it is not necessarily the case on i386 !SMP.

The below patch makes sure that the local APIC and I/O APIC support is
always enabled when MSI support is enabled. To do so, it:

 * Ensures the X86_UP_APIC option is not visible when PCI_MSI is
   enabled. This is the option that allows, on UP machines, to enable
   or not the APIC support. It is already not visible on SMP systems,
   or x86-64 systems, for example. We're simply also making it
   invisible on i386 MSI systems.

 * Ensures that the X86_LOCAL_APIC and X86_IO_APIC options are 'y'
   when PCI_MSI is enabled.

Notice that this change requires a change in drivers/iommu/Kconfig to
avoid a recursive Kconfig dependencey. The AMD_IOMMU option selects
PCI_MSI, but was depending on X86_IO_APIC. This dependency is no
longer needed: as soon as PCI_MSI is selected, the presence of
X86_IO_APIC is guaranteed. Moreover, the AMD_IOMMU already depended on
X86_64, which already guaranteed that X86_IO_APIC was enabled, so this
dependency was anyway redundant.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: http://lkml.kernel.org/r/1380794354-9079-1-git-send-email-thomas.petazzoni@free-electrons.com
Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2013-10-04 10:43:34 -07:00

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# IOMMU_API always gets selected by whoever wants it.
config IOMMU_API
bool
menuconfig IOMMU_SUPPORT
bool "IOMMU Hardware Support"
default y
---help---
Say Y here if you want to compile device drivers for IO Memory
Management Units into the kernel. These devices usually allow to
remap DMA requests and/or remap interrupts from other devices on the
system.
if IOMMU_SUPPORT
config OF_IOMMU
def_bool y
depends on OF
config FSL_PAMU
bool "Freescale IOMMU support"
depends on PPC_E500MC
select IOMMU_API
select GENERIC_ALLOCATOR
help
Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
PAMU can authorize memory access, remap the memory address, and remap I/O
transaction types.
# MSM IOMMU support
config MSM_IOMMU
bool "MSM IOMMU Support"
depends on ARCH_MSM8X60 || ARCH_MSM8960
select IOMMU_API
help
Support for the IOMMUs found on certain Qualcomm SOCs.
These IOMMUs allow virtualization of the address space used by most
cores within the multimedia subsystem.
If unsure, say N here.
config IOMMU_PGTABLES_L2
def_bool y
depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
# AMD IOMMU support
config AMD_IOMMU
bool "AMD IOMMU support"
select SWIOTLB
select PCI_MSI
select PCI_ATS
select PCI_PRI
select PCI_PASID
select IOMMU_API
depends on X86_64 && PCI && ACPI
---help---
With this option you can enable support for AMD IOMMU hardware in
your system. An IOMMU is a hardware component which provides
remapping of DMA memory accesses from devices. With an AMD IOMMU you
can isolate the DMA memory of different devices and protect the
system from misbehaving device drivers or hardware.
You can find out if your system has an AMD IOMMU if you look into
your BIOS for an option to enable it or if you have an IVRS ACPI
table.
config AMD_IOMMU_STATS
bool "Export AMD IOMMU statistics to debugfs"
depends on AMD_IOMMU
select DEBUG_FS
---help---
This option enables code in the AMD IOMMU driver to collect various
statistics about whats happening in the driver and exports that
information to userspace via debugfs.
If unsure, say N.
config AMD_IOMMU_V2
tristate "AMD IOMMU Version 2 driver"
depends on AMD_IOMMU && PROFILING
select MMU_NOTIFIER
---help---
This option enables support for the AMD IOMMUv2 features of the IOMMU
hardware. Select this option if you want to use devices that support
the PCI PRI and PASID interface.
# Intel IOMMU support
config DMAR_TABLE
bool
config INTEL_IOMMU
bool "Support for Intel IOMMU using DMA Remapping Devices"
depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
select IOMMU_API
select DMAR_TABLE
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 INTEL_IOMMU_DEFAULT_ON
def_bool y
prompt "Enable Intel DMA Remapping Devices by default"
depends on INTEL_IOMMU
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 INTEL_IOMMU_BROKEN_GFX_WA
bool "Workaround broken graphics drivers (going away soon)"
depends on INTEL_IOMMU && 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 INTEL_IOMMU_FLOPPY_WA
def_bool y
depends on INTEL_IOMMU && 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 IRQ_REMAP
bool "Support for Interrupt Remapping"
depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
select DMAR_TABLE
---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.
# OMAP IOMMU support
config OMAP_IOMMU
bool "OMAP IOMMU Support"
depends on ARCH_OMAP2PLUS
select IOMMU_API
config OMAP_IOVMM
tristate "OMAP IO Virtual Memory Manager Support"
depends on OMAP_IOMMU
config OMAP_IOMMU_DEBUG
tristate "Export OMAP IOMMU/IOVMM internals in DebugFS"
depends on OMAP_IOVMM && DEBUG_FS
help
Select this to see extensive information about
the internal state of OMAP IOMMU/IOVMM in debugfs.
Say N unless you know you need this.
config TEGRA_IOMMU_GART
bool "Tegra GART IOMMU Support"
depends on ARCH_TEGRA_2x_SOC
select IOMMU_API
help
Enables support for remapping discontiguous physical memory
shared with the operating system into contiguous I/O virtual
space through the GART (Graphics Address Relocation Table)
hardware included on Tegra SoCs.
config TEGRA_IOMMU_SMMU
bool "Tegra SMMU IOMMU Support"
depends on ARCH_TEGRA && TEGRA_AHB
select IOMMU_API
help
Enables support for remapping discontiguous physical memory
shared with the operating system into contiguous I/O virtual
space through the SMMU (System Memory Management Unit)
hardware included on Tegra SoCs.
config EXYNOS_IOMMU
bool "Exynos IOMMU Support"
depends on ARCH_EXYNOS && EXYNOS_DEV_SYSMMU
select IOMMU_API
help
Support for the IOMMU(System MMU) of Samsung Exynos application
processor family. This enables H/W multimedia accellerators to see
non-linear physical memory chunks as a linear memory in their
address spaces
If unsure, say N here.
config EXYNOS_IOMMU_DEBUG
bool "Debugging log for Exynos IOMMU"
depends on EXYNOS_IOMMU
help
Select this to see the detailed log message that shows what
happens in the IOMMU driver
Say N unless you need kernel log message for IOMMU debugging
config SHMOBILE_IPMMU
bool
config SHMOBILE_IPMMU_TLB
bool
config SHMOBILE_IOMMU
bool "IOMMU for Renesas IPMMU/IPMMUI"
default n
depends on (ARM && ARCH_SHMOBILE)
select IOMMU_API
select ARM_DMA_USE_IOMMU
select SHMOBILE_IPMMU
select SHMOBILE_IPMMU_TLB
help
Support for Renesas IPMMU/IPMMUI. This option enables
remapping of DMA memory accesses from all of the IP blocks
on the ICB.
Warning: Drivers (including userspace drivers of UIO
devices) of the IP blocks on the ICB *must* use addresses
allocated from the IPMMU (iova) for DMA with this option
enabled.
If unsure, say N.
choice
prompt "IPMMU/IPMMUI address space size"
default SHMOBILE_IOMMU_ADDRSIZE_2048MB
depends on SHMOBILE_IOMMU
help
This option sets IPMMU/IPMMUI address space size by
adjusting the 1st level page table size. The page table size
is calculated as follows:
page table size = number of page table entries * 4 bytes
number of page table entries = address space size / 1 MiB
For example, when the address space size is 2048 MiB, the
1st level page table size is 8192 bytes.
config SHMOBILE_IOMMU_ADDRSIZE_2048MB
bool "2 GiB"
config SHMOBILE_IOMMU_ADDRSIZE_1024MB
bool "1 GiB"
config SHMOBILE_IOMMU_ADDRSIZE_512MB
bool "512 MiB"
config SHMOBILE_IOMMU_ADDRSIZE_256MB
bool "256 MiB"
config SHMOBILE_IOMMU_ADDRSIZE_128MB
bool "128 MiB"
config SHMOBILE_IOMMU_ADDRSIZE_64MB
bool "64 MiB"
config SHMOBILE_IOMMU_ADDRSIZE_32MB
bool "32 MiB"
endchoice
config SHMOBILE_IOMMU_L1SIZE
int
default 8192 if SHMOBILE_IOMMU_ADDRSIZE_2048MB
default 4096 if SHMOBILE_IOMMU_ADDRSIZE_1024MB
default 2048 if SHMOBILE_IOMMU_ADDRSIZE_512MB
default 1024 if SHMOBILE_IOMMU_ADDRSIZE_256MB
default 512 if SHMOBILE_IOMMU_ADDRSIZE_128MB
default 256 if SHMOBILE_IOMMU_ADDRSIZE_64MB
default 128 if SHMOBILE_IOMMU_ADDRSIZE_32MB
config SPAPR_TCE_IOMMU
bool "sPAPR TCE IOMMU Support"
depends on PPC_POWERNV || PPC_PSERIES
select IOMMU_API
help
Enables bits of IOMMU API required by VFIO. The iommu_ops
is not implemented as it is not necessary for VFIO.
config ARM_SMMU
bool "ARM Ltd. System MMU (SMMU) Support"
depends on ARM64 || (ARM_LPAE && OF)
select IOMMU_API
select ARM_DMA_USE_IOMMU if ARM
help
Support for implementations of the ARM System MMU architecture
versions 1 and 2. The driver supports both v7l and v8l table
formats with 4k and 64k page sizes.
Say Y here if your SoC includes an IOMMU device implementing
the ARM SMMU architecture.
endif # IOMMU_SUPPORT
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