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powerpc/xive: Use the "ibm, chip-id" property only under PowerNV

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The 'chip_id' field of the XIVE CPU structure is used to choose a
target for a source located on the same chip. For that, the XIVE
driver queries the chip identifier from the "ibm,chip-id" property
and compares it to a 'src_chip' field identifying the chip of a
source. This information is only available on the PowerNV platform,
'src_chip' being assigned to XIVE_INVALID_CHIP_ID under pSeries.

The "ibm,chip-id" property is also not available on all platforms. It
was first introduced on PowerNV and later, under QEMU for pSeries/KVM.
However, the property is not part of PAPR and does not exist under
pSeries/PowerVM.

Assign 'chip_id' to XIVE_INVALID_CHIP_ID by default and let the
PowerNV platform override the value with the "ibm,chip-id" property.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210413130352.1183267-1-clg@kaod.org
This commit is contained in:
Cédric Le Goater
2021-04-13 15:03:52 +02:00
committed by Michael Ellerman
parent 38d0b1c9ce
commit e9e16917bc
3 changed files with 10 additions and 6 deletions
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1
arch/powerpc/sysdev/xive/xive-internal.h
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@@ -44,6 +44,7 @@ struct xive_ops {
u32 *sw_irq);
int (*setup_queue)(unsigned int cpu, struct xive_cpu *xc, u8 prio);
void (*cleanup_queue)(unsigned int cpu, struct xive_cpu *xc, u8 prio);
void (*prepare_cpu)(unsigned int cpu, struct xive_cpu *xc);
void (*setup_cpu)(unsigned int cpu, struct xive_cpu *xc);
void (*teardown_cpu)(unsigned int cpu, struct xive_cpu *xc);
bool (*match)(struct device_node *np);