linux-kernel - [PATCH RFC v1 04/15] iommu/arm-smmu-v3: Update CD base address info for user-space

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Date:   Fri, 15 Jan 2021 17:43:31 +0530
From:   Vivek Gautam <vivek.gautam@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        virtualization@...ts.linux-foundation.org
Cc:     joro@...tes.org, will.deacon@....com, mst@...hat.com,
        robin.murphy@....com, jean-philippe@...aro.org,
        eric.auger@...hat.com, alex.williamson@...hat.com,
        kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...el.com, lorenzo.pieralisi@....com,
        shameerali.kolothum.thodi@...wei.com, vivek.gautam@....com
Subject: [PATCH RFC v1 04/15] iommu/arm-smmu-v3: Update CD base address info for user-space

Update base address information in vendor pasid table info to pass that
to user-space for stage1 table management.

Signed-off-by: Vivek Gautam <vivek.gautam@....com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Will Deacon <will.deacon@....com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc: Eric Auger <eric.auger@...hat.com>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Kevin Tian <kevin.tian@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Liu Yi L <yi.l.liu@...el.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
index 8a7187534706..ec37476c8d09 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
@@ -55,6 +55,9 @@ static __le64 *arm_smmu_get_cd_ptr(struct iommu_vendor_psdtable_cfg *pst_cfg,
 		if (arm_smmu_alloc_cd_leaf_table(dev, l1_desc))
 			return NULL;
 
+		if (s1cfg->s1fmt == STRTAB_STE_0_S1FMT_LINEAR)
+			pst_cfg->base = l1_desc->l2ptr_dma;
+
 		l1ptr = cdcfg->cdtab + idx * CTXDESC_L1_DESC_DWORDS;
 		arm_smmu_write_cd_l1_desc(l1ptr, l1_desc);
 		/* An invalid L1CD can be cached */
@@ -211,6 +214,9 @@ static int arm_smmu_alloc_cd_tables(struct iommu_vendor_psdtable_cfg *pst_cfg)
 		goto err_free_l1;
 	}
 
+	if (s1cfg->s1fmt == STRTAB_STE_0_S1FMT_64K_L2)
+		pst_cfg->base = cdcfg->cdtab_dma;
+
 	return 0;
 
 err_free_l1:
-- 
2.17.1