From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <joro@8bytes.org>,
Thierry Reding <thierry.reding@gmail.com>,
Laurentiu Tudor <laurentiu.tudor@nxp.com>
Cc: Vinod Koul <vkoul@kernel.org>, Jonathan Marek <jonathan@marek.ca>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org,
John Stultz <john.stultz@linaro.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/5] iommu/arm-smmu: Make all valid stream mappings BYPASS
Date: Thu, 16 Jul 2020 17:16:15 -0700 [thread overview]
Message-ID: <20200717001619.325317-2-bjorn.andersson@linaro.org> (raw)
In-Reply-To: <20200717001619.325317-1-bjorn.andersson@linaro.org>
Turn all stream mappings marked as valid into BYPASS. This allows the
platform specific implementation to configure stream mappings to match
the boot loader's configuration for e.g. display to continue to function
through the reset of the SMMU.
Tested-by: John Stultz <john.stultz@linaro.org>
Tested-by: Vinod Koul <vkoul@kernel.org>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
Changes since v1:
- Mark arm_smmu_setup_identity() static
- Picked up tested-by tags
drivers/iommu/arm-smmu.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 243bc4cb2705..fb85e716ae9a 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1924,6 +1924,22 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
return 0;
}
+static int arm_smmu_setup_identity(struct arm_smmu_device *smmu)
+{
+ int i;
+
+ for (i = 0; i < smmu->num_mapping_groups; i++) {
+ if (smmu->smrs[i].valid) {
+ smmu->s2crs[i].type = S2CR_TYPE_BYPASS;
+ smmu->s2crs[i].privcfg = S2CR_PRIVCFG_DEFAULT;
+ smmu->s2crs[i].cbndx = 0xff;
+ smmu->s2crs[i].count++;
+ }
+ }
+
+ return 0;
+}
+
struct arm_smmu_match_data {
enum arm_smmu_arch_version version;
enum arm_smmu_implementation model;
@@ -2181,6 +2197,10 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
if (err)
return err;
+ err = arm_smmu_setup_identity(smmu);
+ if (err)
+ return err;
+
if (smmu->version == ARM_SMMU_V2) {
if (smmu->num_context_banks > smmu->num_context_irqs) {
dev_err(dev,
--
2.26.2
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-07-17 0:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 0:16 [PATCH v2 0/5] iommu/arm-smmu: Support maintaining bootloader mappings Bjorn Andersson
2020-07-17 0:16 ` Bjorn Andersson [this message]
2020-07-17 0:16 ` [PATCH v2 2/5] iommu/arm-smmu: Emulate bypass by using context banks Bjorn Andersson
2020-07-20 8:58 ` Will Deacon
2020-07-20 15:51 ` Jordan Crouse
2020-07-17 0:16 ` [PATCH v2 3/5] iommu/arm-smmu: Move SMR and S2CR definitions to header file Bjorn Andersson
2020-07-17 0:16 ` [PATCH v2 4/5] iommu/arm-smmu-qcom: Consistently initialize stream mappings Bjorn Andersson
2020-07-17 0:16 ` [PATCH v2 5/5] iommu/arm-smmu: Setup identity domain for boot mappings Bjorn Andersson
2020-07-20 9:03 ` Will Deacon
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