From: Tianyu Lan <tianyu....@microsoft.com>
When initialize swiotlb bounce buffer, smp_init() has not been
called and cpu number can not be got from num_online_cpus().
Use the number of lapic entry to set swiotlb area number and
keep swiotlb area number equal to cpu number on the x86 platform.
Based-on-idea-by: Andi Kleen <a...@linux.intel.com>
Signed-off-by: Tianyu Lan <tianyu....@microsoft.com>
---
arch/x86/kernel/acpi/boot.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 907cc98b1938..7e13499f2c10 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -22,6 +22,7 @@
#include <linux/efi-bgrt.h>
#include <linux/serial_core.h>
#include <linux/pgtable.h>
+#include <linux/swiotlb.h>
#include <asm/e820/api.h>
#include <asm/irqdomain.h>
@@ -1131,6 +1132,8 @@ static int __init acpi_parse_madt_lapic_entries(void)
return count;
}
+ swiotlb_adjust_nareas(max(count, x2count));
+
x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
acpi_parse_x2apic_nmi, 0);
count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
--
2.25.1
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
