Now that ghes notification helpers provide the fixmap slots and
take the lock themselves, multiple NMI-like notifications can
be used on arm64.

These should be named after their notification method as they can't
all be called 'NMI'. x86's NOTIFY_NMI already is, change the SEA
fixmap entry to be called FIX_APEI_GHES_SEA.

Future patches can add support for FIX_APEI_GHES_SEI and
FIX_APEI_GHES_SDEI_{NORMAL,CRITICAL}.

Because all of ghes.c builds on both architectures, provide a
constant for each fixmap entry that the architecture will never
use.

Signed-off-by: James Morse <james.morse@arm.com>

---
Changes since v7:
 * Removed v6's #ifdefs, these aren't needed now that SEA/NMI can't be
   turned off on their respective architectures.

Changes since v6:
 * Added #ifdef definitions of each missing fixmap entry.

Changes since v3:
 * idx/lock are now in a separate struct.
 * Add to the comment above ghes_fixmap_lock_irq so that it makes more
   sense in isolation.
---
 arch/arm64/include/asm/fixmap.h | 2 +-
 drivers/acpi/apei/ghes.c        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
index ec1e6d6fa14c..966dd4bb23f2 100644
--- a/arch/arm64/include/asm/fixmap.h
+++ b/arch/arm64/include/asm/fixmap.h

@@ -55,7 +55,7 @@ enum fixed_addresses {
 #ifdef CONFIG_ACPI_APEI_GHES
 	/* Used for GHES mapping from assorted contexts */
 	FIX_APEI_GHES_IRQ,
-	FIX_APEI_GHES_NMI,
+	FIX_APEI_GHES_SEA,
 #endif /* CONFIG_ACPI_APEI_GHES */
 
 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 957c1559ebf5..e6f0d176b245 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c

@@ -958,7 +958,7 @@ int ghes_notify_sea(void)
 	int rv;
 
 	raw_spin_lock(&ghes_notify_lock_sea);
-	rv = ghes_in_nmi_spool_from_list(&ghes_sea, FIX_APEI_GHES_NMI);
+	rv = ghes_in_nmi_spool_from_list(&ghes_sea, FIX_APEI_GHES_SEA);
 	raw_spin_unlock(&ghes_notify_lock_sea);
 
 	return rv;

-- 
2.20.1


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