From 756c52c632f5c2b054bb54b1ea9177329e4b8ce5 Mon Sep 17 00:00:00 2001 From: Cédric Le Goater Date: Fri, 5 Nov 2021 11:26:28 +0100 Subject: powerpc/xive: Activate StoreEOI on P10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211105102636.1016378-4-clg@kaod.org --- arch/powerpc/sysdev/xive/native.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/powerpc/sysdev/xive') 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); -- cgit v1.2.3