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 <c...@kaod.org>
---
arch/powerpc/sysdev/xive/xive-internal.h | 1 +
arch/powerpc/sysdev/xive/common.c | 9 +++------
arch/powerpc/sysdev/xive/native.c | 6 ++++++
3 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/sysdev/xive/xive-internal.h
b/arch/powerpc/sysdev/xive/xive-internal.h
index b3a456fdd3a5..504e7edce358 100644
--- a/arch/powerpc/sysdev/xive/xive-internal.h
+++ b/arch/powerpc/sysdev/xive/xive-internal.h
@@ -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);
diff --git a/arch/powerpc/sysdev/xive/common.c
b/arch/powerpc/sysdev/xive/common.c
index 587738ec4229..5acd76403ee7 100644
--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c
@@ -1414,17 +1414,14 @@ static int xive_prepare_cpu(unsigned int cpu)
xc = per_cpu(xive_cpu, cpu);
if (!xc) {
- struct device_node *np;
-
xc = kzalloc_node(sizeof(struct xive_cpu),
GFP_KERNEL, cpu_to_node(cpu));
if (!xc)
return -ENOMEM;
- np = of_get_cpu_node(cpu, NULL);
- if (np)
- xc->chip_id = of_get_ibm_chip_id(np);
- of_node_put(np);
xc->hw_ipi = XIVE_BAD_IRQ;
+ xc->chip_id = XIVE_INVALID_CHIP_ID;
+ if (xive_ops->prepare_cpu)
+ xive_ops->prepare_cpu(cpu, xc);
per_cpu(xive_cpu, cpu) = xc;
}
diff --git a/arch/powerpc/sysdev/xive/native.c
b/arch/powerpc/sysdev/xive/native.c
index 1bb84febbaee..4fcd2dd1de71 100644
--- a/arch/powerpc/sysdev/xive/native.c
+++ b/arch/powerpc/sysdev/xive/native.c
@@ -382,6 +382,11 @@ static void xive_native_update_pending(struct xive_cpu *xc)
}
}
+static void xive_native_prepare_cpu(unsigned int cpu, struct xive_cpu *xc)
+{
+ xc->chip_id = cpu_to_chip_id(cpu);
+}
+
static void xive_native_setup_cpu(unsigned int cpu, struct xive_cpu *xc)
{
s64 rc;
@@ -464,6 +469,7 @@ static const struct xive_ops xive_native_ops = {
.match = xive_native_match,
.shutdown = xive_native_shutdown,
.update_pending = xive_native_update_pending,
+ .prepare_cpu = xive_native_prepare_cpu,
.setup_cpu = xive_native_setup_cpu,
.teardown_cpu = xive_native_teardown_cpu,
.sync_source = xive_native_sync_source,
--
2.26.3
