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authorJulien Grall <julien.grall@arm.com>2019-05-01 14:58:18 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2019-05-03 15:19:20 +0100
commitaaebdf8d68479f78d9f72b239684f70fbb0722c6 (patch)
tree3e230716bc5a5db48c10f4241c58f752e4e9fb44 /kernel/irq/Kconfig
parent009669e7481361470f7667c96a96893c8ba5f461 (diff)
downloadlinux-stericsson-aaebdf8d68479f78d9f72b239684f70fbb0722c6.tar.gz
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/irq/Kconfig')
-rw-r--r--kernel/irq/Kconfig3
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