linux-kernel - [RFC PATCH 3/5] iommu/io-pgtable: Introduce struct vtd

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Message-Id: <20231106071226.9656-4-tina.zhang@intel.com>
Date:   Mon,  6 Nov 2023 02:12:24 -0500
From:   Tina Zhang <tina.zhang@...el.com>
To:     Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>, joro@...tes.org,
        will@...nel.org, Yi Liu <yi.l.liu@...el.com>
Cc:     virtualization@...ts.linux-foundation.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Tina Zhang <tina.zhang@...el.com>
Subject: [RFC PATCH 3/5] iommu/io-pgtable: Introduce struct vtd_cfg

VT-d hardware cap/ecap information is needed for driver to generate VT-d
format IO page table. Add struct vtd_cfg to keep the info.

Signed-off-by: Tina Zhang <tina.zhang@...el.com>
---
 include/linux/io-pgtable.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
index b2857c18f963..ae6a2e44b027 100644
--- a/include/linux/io-pgtable.h
+++ b/include/linux/io-pgtable.h
@@ -147,6 +147,11 @@ struct io_pgtable_cfg {
 			u32 n_ttbrs;
 		} apple_dart_cfg;
 
+		struct {
+			u64 cap_reg;
+			u64 ecap_reg;
+		} vtd_cfg;
+
 		struct {
 			dma_addr_t	pgd;
 		} virt;
-- 
2.39.3