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powerpc/xive: Activate StoreEOI on P10

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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 b1f9be9392
("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@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211105102636.1016378-4-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-11-05 11:26:28 +01:00 committed by Michael Ellerman
parent bd5b00c6cf
commit 756c52c632
2 changed files with 3 additions and 0 deletions
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1
arch/powerpc/include/asm/opal-api.h
View file

@ -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 */

2
arch/powerpc/sysdev/xive/native.c
View file

@ -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);