From 4db96bfe9d7772d6ddedd62ce478895999043fd7 Mon Sep 17 00:00:00 2001 From: Kan Liang Date: Tue, 31 Jan 2023 15:37:34 +0800 Subject: iommu/vt-d: Support size of the register set in DRHD A new field, which indicates the size of the remapping hardware register set for this remapping unit, is introduced in the DMA-remapping hardware unit definition (DRHD) structure with the VT-d Spec 4.0. With this information, SW doesn't need to 'guess' the size of the register set anymore. Update the struct acpi_dmar_hardware_unit to reflect the field. Store the size of the register set in struct dmar_drhd_unit for each dmar device. The 'size' information is ResvZ for the old BIOS and platforms. Fall back to the old guessing method. There is nothing changed. Signed-off-by: Kan Liang Link: https://lore.kernel.org/r/20230128200428.1459118-2-kan.liang@linux.intel.com Signed-off-by: Lu Baolu Signed-off-by: Joerg Roedel --- include/linux/dmar.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/dmar.h') diff --git a/include/linux/dmar.h b/include/linux/dmar.h index d81a51978d01..725d5e6acec0 100644 --- a/include/linux/dmar.h +++ b/include/linux/dmar.h @@ -39,6 +39,7 @@ struct dmar_drhd_unit { struct list_head list; /* list of drhd units */ struct acpi_dmar_header *hdr; /* ACPI header */ u64 reg_base_addr; /* register base address*/ + unsigned long reg_size; /* size of register set */ struct dmar_dev_scope *devices;/* target device array */ int devices_cnt; /* target device count */ u16 segment; /* PCI domain */ -- cgit v1.2.3-58-ga151