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From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Joerg Roedel <joro@8bytes.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
	Jordan Crouse <jcrouse@codeaurora.org>,
	Rob Clark <robdclark@chromium.org>
Cc: linux-arm-msm@vger.kernel.org, iommu@lists.linux-foundation.org,
	Sibi Sankar <sibis@codeaurora.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v3 7/8] iommu/arm-smmu: Provide helper for allocating identity domain
Date: Fri,  4 Sep 2020 15:55:12 +0000	[thread overview]
Message-ID: <20200904155513.282067-8-bjorn.andersson@linaro.org> (raw)
In-Reply-To: <20200904155513.282067-1-bjorn.andersson@linaro.org>

Some platform implementations needs to be able to allocate a domain for
emulating identity mappings using a context bank without translation.
Provide a helper function to allocate such a domain.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

Changes since v2:
- Extracted from previous arm_smmu_setup_identity() implementation

 drivers/iommu/arm/arm-smmu/arm-smmu.c | 25 +++++++++++++++++++++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.h |  2 ++
 2 files changed, 27 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 4c4d302cd747..3c06146dfdb9 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1924,6 +1924,31 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
 	return 0;
 }
 
+struct iommu_domain *arm_smmu_alloc_identity_domain(struct arm_smmu_device *smmu)
+{
+	struct iommu_domain *identity;
+	int ret;
+
+	/* Create a IDENTITY domain to use for all inherited streams */
+	identity = arm_smmu_domain_alloc(IOMMU_DOMAIN_IDENTITY);
+	if (!identity) {
+		dev_err(smmu->dev, "failed to create identity domain\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	identity->pgsize_bitmap = smmu->pgsize_bitmap;
+	identity->type = IOMMU_DOMAIN_IDENTITY;
+	identity->ops = &arm_smmu_ops;
+
+	ret = arm_smmu_init_domain_context(identity, smmu, NULL);
+	if (ret < 0) {
+		dev_err(smmu->dev, "failed to initialize identity domain: %d\n", ret);
+		return ERR_PTR(ret);
+	}
+
+	return identity;
+}
+
 struct arm_smmu_match_data {
 	enum arm_smmu_arch_version version;
 	enum arm_smmu_implementation model;
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index f58164976e74..fbdf3d7ca70d 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -537,4 +537,6 @@ struct arm_smmu_device *qcom_adreno_smmu_impl_init(struct arm_smmu_device *smmu)
 void arm_smmu_write_context_bank(struct arm_smmu_device *smmu, int idx);
 int arm_mmu500_reset(struct arm_smmu_device *smmu);
 
+struct iommu_domain *arm_smmu_alloc_identity_domain(struct arm_smmu_device *smmu);
+
 #endif /* _ARM_SMMU_H */
-- 
2.28.0

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  parent reply	other threads:[~2020-09-04 16:01 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-04 15:55 [PATCH v3 0/8] iommu/arm-smmu: Support maintaining bootloader mappings Bjorn Andersson
2020-09-04 15:55 ` [PATCH v3 1/8] iommu/arm-smmu: Refactor context bank allocation Bjorn Andersson
2020-09-08 18:42   ` Jordan Crouse
2020-09-08 18:46     ` Jordan Crouse
2020-09-11  8:18   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 2/8] iommu/arm-smmu: Delay modifying domain during init Bjorn Andersson
2020-09-11  8:20   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 3/8] iommu/arm-smmu: Consult context bank allocator for identify domains Bjorn Andersson
2020-09-11  8:21   ` Sai Prakash Ranjan
2020-09-11  8:24   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 4/8] iommu/arm-smmu-qcom: Emulate bypass by using context banks Bjorn Andersson
2020-09-11  8:25   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 5/8] iommu/arm-smmu-qcom: Consistently initialize stream mappings Bjorn Andersson
2020-09-11  8:26   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 6/8] iommu/arm-smmu: Add impl hook for inherit boot mappings Bjorn Andersson
2020-09-11  8:27   ` Sai Prakash Ranjan
2020-09-11 17:13   ` Robin Murphy
2020-09-13  3:25     ` Bjorn Andersson
2020-09-21 21:08       ` Will Deacon
2020-09-24 15:55         ` Bjorn Andersson
2020-10-12  7:31         ` Bjorn Andersson
2020-10-13 16:47           ` Robin Murphy
2020-09-04 15:55 ` Bjorn Andersson [this message]
2020-09-11  8:28   ` [PATCH v3 7/8] iommu/arm-smmu: Provide helper for allocating identity domain Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 8/8] iommu/arm-smmu-qcom: Setup identity domain for boot mappings Bjorn Andersson
2020-09-11  8:29   ` Sai Prakash Ranjan
2020-09-11 17:29   ` Robin Murphy
2020-09-05 22:27 ` [PATCH v3 0/8] iommu/arm-smmu: Support maintaining bootloader mappings Rob Clark
2020-09-09 14:46 ` Laurentiu Tudor
2020-09-10 22:56 ` John Stultz
2020-09-11  8:16 ` Sai Prakash Ranjan
2020-09-11 16:10 ` Amit Pundir
2020-09-16 10:09 ` Laurentiu Tudor

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