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| author | Julien Grall <julien.grall@arm.com> | 2019-05-01 14:58:18 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2019-05-03 15:19:20 +0100 |
| commit | aaebdf8d68479f78d9f72b239684f70fbb0722c6 (patch) | |
| tree | 3e230716bc5a5db48c10f4241c58f752e4e9fb44 /kernel | |
| parent | 009669e7481361470f7667c96a96893c8ba5f461 (diff) | |
| download | linux-aaebdf8d68479f78d9f72b239684f70fbb0722c6.tar.gz linux-aaebdf8d68479f78d9f72b239684f70fbb0722c6.tar.bz2 linux-aaebdf8d68479f78d9f72b239684f70fbb0722c6.zip | |
genirq/msi: Add a new field in msi_desc to store an IOMMU cookie
When an MSI doorbell is located downstream of an IOMMU, it is required
to swizzle the physical address with an appropriately-mapped IOVA for any
device attached to one of our DMA ops domain.
At the moment, the allocation of the mapping may be done when composing
the message. However, the composing may be done in non-preemtible
context while the allocation requires to be called from preemptible
context.
A follow-up change will split the current logic in two functions
requiring to keep an IOMMU cookie per MSI.
A new field is introduced in msi_desc to store an IOMMU cookie. As the
cookie may not be required in some configuration, the field is protected
under a new config CONFIG_IRQ_MSI_IOMMU.
A pair of helpers has also been introduced to access the field.
Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 5f3e2baefca9..8fee06625c37 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -91,6 +91,9 @@ config GENERIC_MSI_IRQ_DOMAIN select IRQ_DOMAIN_HIERARCHY select GENERIC_MSI_IRQ +config IRQ_MSI_IOMMU + bool + config HANDLE_DOMAIN_IRQ bool |