linux-kernel - [PATCH v2 4/6] iommu/exynos: Implement shutdown driver method

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

Message-Id: <20221103195154.21495-5-semen.protsenko@linaro.org>
Date:   Thu,  3 Nov 2022 20:51:52 +0100
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Janghyuck Kim <janghyuck.kim@...sung.com>,
        Cho KyongHo <pullip.cho@...sung.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        David Virag <virag.david003@...il.com>, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: [PATCH v2 4/6] iommu/exynos: Implement shutdown driver method

While remove method shouldn't be implemented, as it can't be done
reliably, the shutdown method can be useful for performing a kexec.
That was inspired by other IOMMU drivers, see commit 1a4e90f25b2c
("iommu/rockchip: Perform a reset on shutdown") for example.

Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
Changes in v2:
  - New patch

 drivers/iommu/exynos-iommu.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index aad845677bda..cd3f74e638f0 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -753,6 +753,16 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static void exynos_sysmmu_shutdown(struct platform_device *pdev)
+{
+	struct sysmmu_drvdata *data = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	int irq = platform_get_irq(pdev, 0);
+
+	devm_free_irq(dev, irq, data);
+	pm_runtime_force_suspend(dev);
+}
+
 static int __maybe_unused exynos_sysmmu_suspend(struct device *dev)
 {
 	struct sysmmu_drvdata *data = dev_get_drvdata(dev);
@@ -803,6 +813,7 @@ MODULE_DEVICE_TABLE(of, sysmmu_of_match);
 
 static struct platform_driver exynos_sysmmu_driver = {
 	.probe	= exynos_sysmmu_probe,
+	.shutdown = exynos_sysmmu_shutdown,
 	.driver	= {
 		.name		= "exynos-sysmmu",
 		.of_match_table	= sysmmu_of_match,
-- 
2.35.1