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powerpc/xive: Add interrupt flag to disable automatic EOI

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This will be used by KVM in order to keep escalation interrupts
in the non-EOI (masked) state after they fire. They will be
re-enabled directly in HW by KVM when needed.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2018-01-12 13:39:28 +11:00 committed by Michael Ellerman
parent 12c1f339cd
commit 7f1c410da5
2 changed files with 5 additions and 1 deletions
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3
arch/powerpc/include/asm/xive.h
View file

@ -58,6 +58,9 @@ struct xive_irq_data {
#define XIVE_IRQ_FLAG_EOI_FW 0x10
#define XIVE_IRQ_FLAG_H_INT_ESB 0x20
/* Special flag set by KVM for excalation interrupts */
#define XIVE_IRQ_NO_EOI 0x80
#define XIVE_INVALID_CHIP_ID -1
/* A queue tracking structure in a CPU */

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

@ -367,7 +367,8 @@ static void xive_irq_eoi(struct irq_data *d)
* EOI the source if it hasn't been disabled and hasn't
* been passed-through to a KVM guest
*/
if (!irqd_irq_disabled(d) && !irqd_is_forwarded_to_vcpu(d))
if (!irqd_irq_disabled(d) && !irqd_is_forwarded_to_vcpu(d) &&
!(xd->flags & XIVE_IRQ_NO_EOI))
xive_do_source_eoi(irqd_to_hwirq(d), xd);
/*