irqchip/gic-v3-its: Don't map the MSI page in its_irq_compose_msi_msg()

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its_irq_compose_msi_msg() may be called from non-preemptible context.
However, on RT, iommu_dma_map_msi_msg requires to be called from a
preemptible context.

A recent change split iommu_dma_map_msi_msg() in two new functions:
one that should be called in preemptible context, the other does
not have any requirement.

The GICv3 ITS driver is reworked to avoid executing preemptible code in
non-preemptible context. This can be achieved by preparing the MSI
mapping when allocating the MSI interrupt.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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Julien Grall 2019-05-01 14:58:21 +01:00 • committed by Marc Zyngier

parent 737be74710

commit 35ae7df21b

1 changed files with 6 additions and 1 deletions

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drivers/irqchip/irq-gic-v3-its.c

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