[PATCH 03/11] powerpc/xive: Activate StoreEOI on P10

[Cédric Le Goater]

StoreEOI (the capability to EOI with a store) requires load-after-store
ordering in some cases to be reliable. P10 introduced a new offset for
load operations to enforce correct ordering and the XIVE driver has
the required support since kernel 5.8, commit b1f9be9392f0
("powerpc/xive: Enforce load-after-store ordering when StoreEOI is active")

Since skiboot v7, StoreEOI support is advertised on P10 with a new flag
on the PowerNV platform. See skiboot commit 4bd7d84afe46 ("xive/p10:
Introduce a new OPAL_XIVE_IRQ_STORE_EOI2 flag"). When detected,
activate the feature.

Signed-off-by: Cédric Le Goater <clg at kaod.org>
---
 arch/powerpc/include/asm/opal-api.h | 1 +
 arch/powerpc/sysdev/xive/native.c   | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 0b63ba7d5917..a2bc4b95e703 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -1094,6 +1094,7 @@ enum {
 	OPAL_XIVE_IRQ_SHIFT_BUG		= 0x00000008, /* P9 DD1.0 workaround */
 	OPAL_XIVE_IRQ_MASK_VIA_FW	= 0x00000010, /* P9 DD1.0 workaround */
 	OPAL_XIVE_IRQ_EOI_VIA_FW	= 0x00000020, /* P9 DD1.0 workaround */
+	OPAL_XIVE_IRQ_STORE_EOI2	= 0x00000040,
 };
 
 /* Flags for OPAL_XIVE_GET/SET_QUEUE_INFO */
diff --git a/arch/powerpc/sysdev/xive/native.c b/arch/powerpc/sysdev/xive/native.c
index 1aec282cd650..7ec8911dad57 100644
--- a/arch/powerpc/sysdev/xive/native.c
+++ b/arch/powerpc/sysdev/xive/native.c
@@ -63,6 +63,8 @@ int xive_native_populate_irq_data(u32 hw_irq, struct xive_irq_data *data)
 	opal_flags = be64_to_cpu(flags);
 	if (opal_flags & OPAL_XIVE_IRQ_STORE_EOI)
 		data->flags |= XIVE_IRQ_FLAG_STORE_EOI;
+	if (opal_flags & OPAL_XIVE_IRQ_STORE_EOI2)
+		data->flags |= XIVE_IRQ_FLAG_STORE_EOI;
 	if (opal_flags & OPAL_XIVE_IRQ_LSI)
 		data->flags |= XIVE_IRQ_FLAG_LSI;
 	data->eoi_page = be64_to_cpu(eoi_page);
-- 
2.31.1