[PATCH v1 6/6] iommu/vt-d: Make DMAR_UNITS_SUPPORTED default 1024

From: Lu Baolu
Date: Sat Jun 25 2022 - 08:56:54 EST


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@xxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
include/linux/dmar.h | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index cbd714a198a0..d81a51978d01 100644
--- 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
--
2.25.1