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powerpc/xive: Change IRQ domain to a tree domain

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Commit 4f86a06e2d ("irqdomain: Make normal and nomap irqdomains
exclusive") introduced an IRQ_DOMAIN_FLAG_NO_MAP flag to isolate the
'nomap' domains still in use under the powerpc arch. With this new
flag, the revmap_tree of the IRQ domain is not used anymore. This
change broke the support of shared LSIs [1] in the XIVE driver because
it was relying on a lookup in the revmap_tree to query previously
mapped interrupts. Linux now creates two distinct IRQ mappings on the
same HW IRQ which can lead to unexpected behavior in the drivers.

The XIVE IRQ domain is not a direct mapping domain and its HW IRQ
interrupt number space is rather large : 1M/socket on POWER9 and
POWER10, change the XIVE driver to use a 'tree' domain type instead.

[1] For instance, a linux KVM guest with virtio-rng and virtio-balloon
    devices.

Fixes: 4f86a06e2d ("irqdomain: Make normal and nomap irqdomains exclusive")
Cc: stable@vger.kernel.org # v5.14+
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Greg Kurz <groug@kaod.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211116134022.420412-1-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-11-16 14:40:22 +01:00 committed by Michael Ellerman
parent 1e35eba405
commit 8e80a73fa9
2 changed files with 1 additions and 3 deletions
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1
arch/powerpc/sysdev/xive/Kconfig
View File

@ -3,7 +3,6 @@ config PPC_XIVE
bool
select PPC_SMP_MUXED_IPI
select HARDIRQS_SW_RESEND
select IRQ_DOMAIN_NOMAP
config PPC_XIVE_NATIVE
bool

3
arch/powerpc/sysdev/xive/common.c
View File

@ -1443,8 +1443,7 @@ static const struct irq_domain_ops xive_irq_domain_ops = {
static void __init xive_init_host(struct device_node *np)
{
xive_irq_domain = irq_domain_add_nomap(np, XIVE_MAX_IRQ,
&xive_irq_domain_ops, NULL);
xive_irq_domain = irq_domain_add_tree(np, &xive_irq_domain_ops, NULL);
if (WARN_ON(xive_irq_domain == NULL))
return;
irq_set_default_host(xive_irq_domain);