[PATCH v5 09/13] iommu/arm-smmu-v3: Prepare for handling arm_smmu_write_ctx_desc() failure

Jean-Philippe Brucker jean-philippe at linaro.org
Wed Jan 15 04:52:35 PST 2020


Second-level context descriptor tables will be allocated lazily in
arm_smmu_write_ctx_desc(). Help with handling allocation failure by
moving the CD write into arm_smmu_domain_finalise_s1().

Reviewed-by: Eric Auger <eric.auger at redhat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron at huawei.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe at linaro.org>
---
 drivers/iommu/arm-smmu-v3.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 7b7dea596f60..c35863073ab3 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2299,8 +2299,15 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
 	cfg->cd.ttbr	= pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0];
 	cfg->cd.tcr	= pgtbl_cfg->arm_lpae_s1_cfg.tcr;
 	cfg->cd.mair	= pgtbl_cfg->arm_lpae_s1_cfg.mair;
+
+	ret = arm_smmu_write_ctx_desc(smmu_domain, 0, &cfg->cd);
+	if (ret)
+		goto out_free_cd_tables;
+
 	return 0;
 
+out_free_cd_tables:
+	arm_smmu_free_cd_tables(smmu_domain);
 out_free_asid:
 	arm_smmu_bitmap_free(smmu->asid_map, asid);
 	return ret;
@@ -2567,10 +2574,6 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	if (smmu_domain->stage != ARM_SMMU_DOMAIN_BYPASS)
 		master->ats_enabled = arm_smmu_ats_supported(master);
 
-	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1)
-		arm_smmu_write_ctx_desc(smmu_domain, 0,
-					&smmu_domain->s1_cfg.cd);
-
 	arm_smmu_install_ste_for_dev(master);
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-- 
2.24.1




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