From: Lu Baolu <baolu.lu@linux.intel.com>
Date: Tue, 12 Jul 2022 08:09:08 +0800
Subject: [PATCH 6/6] iommu/vt-d: Make DMAR_UNITS_SUPPORTED default 1024
Git-commit: 25357900f4e67094dd09b7dcb8a5f47c3f5a159d
Patch-mainline: v6.0-rc1
References: bsc#1200301

If the available hardware exceeds DMAR_UNITS_SUPPORTED (previously set
to MAX_IO_APICS, or 128), it causes these messages: "DMAR: Failed to
allocate seq_id", "DMAR: Parse DMAR table failure.", and "x2apic: IRQ
remapping doesn't support X2APIC mode x2apic disabled"; and the system
fails to boot properly.

To support up to 64 sockets with 10 DMAR units each (640), make the
value of DMAR_UNITS_SUPPORTED default 1024.

Signed-off-by: Steve Wahl<steve.wahl@hpe.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Link: https://lore.kernel.org/linux-iommu/20220615183650.32075-1-steve.wahl@hpe.com/
Link: https://lore.kernel.org/r/20220702015610.2849494-7-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 include/linux/dmar.h |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -18,11 +18,7 @@
 
 struct acpi_dmar_header;
 
-#ifdef	CONFIG_X86
-# define	DMAR_UNITS_SUPPORTED	MAX_IO_APICS
-#else
-# define	DMAR_UNITS_SUPPORTED	64
-#endif
+#define DMAR_UNITS_SUPPORTED	1024
 
 /* DMAR Flags */
 #define DMAR_INTR_REMAP		0x1