linux-kernel - [PATCH v6] iommu/arm-smmu-qcom: Request direct mapping for modem device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200511175532.25874-1-sibis@codeaurora.org>
Date:   Mon, 11 May 2020 23:25:32 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     will@...nel.org, robin.murphy@....com, joro@...tes.org,
        swboyd@...omium.org
Cc:     bjorn.andersson@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, dianders@...omium.org,
        evgreen@...omium.org, mka@...omium.org,
        Sibi Sankar <sibis@...eaurora.org>
Subject: [PATCH v6] iommu/arm-smmu-qcom: Request direct mapping for modem device

The modem remote processor has two access paths to DDR. One path is
directly connected to DDR and another path goes through an SMMU. The
SMMU path is configured to be a direct mapping because it's used by
various peripherals in the modem subsystem. Typically this direct
mapping is configured statically at EL2 by QHEE (Qualcomm's Hypervisor
Execution Environment) before the kernel is entered.

In certain firmware configuration, especially when the kernel is already
in full control of the SMMU, defer programming the modem SIDs to the
kernel. Let's add compatibles here so that we can have the kernel
program the SIDs for the modem in these cases.

Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
---

V6
 * Rebased on Will's for-joerg/arm-smmu/updates
 * Reword commit message and add more details [Stephen]

 drivers/iommu/arm-smmu-qcom.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/arm-smmu-qcom.c b/drivers/iommu/arm-smmu-qcom.c
index 5bedf21587a56..cf01d0215a397 100644
--- a/drivers/iommu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm-smmu-qcom.c
@@ -17,7 +17,9 @@ static const struct of_device_id qcom_smmu_client_of_match[] = {
 	{ .compatible = "qcom,mdp4" },
 	{ .compatible = "qcom,mdss" },
 	{ .compatible = "qcom,sc7180-mdss" },
+	{ .compatible = "qcom,sc7180-mss-pil" },
 	{ .compatible = "qcom,sdm845-mdss" },
+	{ .compatible = "qcom,sdm845-mss-pil" },
 	{ }
 };

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project