From patchwork Mon Oct 28 17:58:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robin Murphy X-Patchwork-Id: 13853812 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 250071DF74C; Mon, 28 Oct 2024 17:58:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730138340; cv=none; b=Gt1S1bBEj2Ecx59Sbj7IRbC4fLeVB7B+XlTKLiWVFwuavlsd3awk+TKEK7wlVk2SNJAKBk/zMvSC52DGA9jZFnJxwFv3so2iqUL4pZ8fxmDz1SdOyfQgRxSPFs9Mu0haqCP2UrAhj1UCJdEiXoCSWP+eDYlWipUOq3OvGMEqPrE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730138340; c=relaxed/simple; bh=rt//uHCkf6lFY54nkpmLvuouPGvdIxO+V4YFqOtr5CU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Dobd1iuOox+CNZNSalLr5JEBiUnqL5L2xxjFkZvRfJsM3b5fWf+gxARLIBNwSiBUmyFRgLbZWDR6mKgPJ63GdRQNv0zCLF66Zq6tcAfZdnMKm8cwkvkJ0egLE6XWsAwcsZr5Txi+fzx7lCI377CSfvhwRxhhMOnC+zfXPVFyeP0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4DA6316F8; Mon, 28 Oct 2024 10:59:27 -0700 (PDT) Received: from e121345-lin.cambridge.arm.com (e121345-lin.cambridge.arm.com [10.1.196.40]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 8D2133F66E; Mon, 28 Oct 2024 10:58:55 -0700 (PDT) From: Robin Murphy To: joro@8bytes.org, will@kernel.org, laurent.pinchart@ideasonboard.com, mchehab@kernel.org, andersson@kernel.org, mathieu.poirier@linaro.org Cc: hns@goldelico.com, b-padhi@ti.com, andreas@kemnade.info, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-media@vger.kernel.org, linux-remoteproc@vger.kernel.org Subject: [PATCH 3/4] iommu/omap: Add minimal fwnode support Date: Mon, 28 Oct 2024 17:58:37 +0000 Message-Id: X-Mailer: git-send-email 2.39.2.101.g768bb238c484.dirty In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-remoteproc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The OMAP driver uses the generic "iommus" DT binding but is the final holdout not implementing a corresponding .of_xlate method. Unfortunately this now results in __iommu_probe_device() failing to find ops due to client devices missing the expected IOMMU fwnode association. The legacy DT parsing in omap_iommu_probe_device() could probably all be delegated to generic code now, but for the sake of an immediate fix, just add a minimal .of_xlate implementation to allow client fwspecs to be created appropriately, and so the ops lookup to work again. This means we also need to register the additional instances on DRA7 so that of_iommu_xlate() doesn't defer indefinitely waiting for their ops either, but we'll continue to hide them from sysfs just in case. This also renders the bus_iommu_probe() call entirely redundant. Reported-by: Beleswar Padhi Link: https://lore.kernel.org/linux-iommu/0dbde87b-593f-4b14-8929-b78e189549ad@ti.com/ Reported-by: H. Nikolaus Schaller Link: https://lore.kernel.org/linux-media/A7C284A9-33A5-4E21-9B57-9C4C213CC13F@goldelico.com/ Fixes: 17de3f5fdd35 ("iommu: Retire bus ops") Signed-off-by: Robin Murphy --- drivers/iommu/omap-iommu.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index c9528065a59a..3f72aef8bd5b 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -1230,25 +1230,24 @@ static int omap_iommu_probe(struct platform_device *pdev) if (err) return err; - err = iommu_device_register(&obj->iommu, &omap_iommu_ops, &pdev->dev); - if (err) - goto out_sysfs; obj->has_iommu_driver = true; } + err = iommu_device_register(&obj->iommu, &omap_iommu_ops, &pdev->dev); + if (err) + goto out_sysfs; + pm_runtime_enable(obj->dev); omap_iommu_debugfs_add(obj); dev_info(&pdev->dev, "%s registered\n", obj->name); - /* Re-probe bus to probe device attached to this IOMMU */ - bus_iommu_probe(&platform_bus_type); - return 0; out_sysfs: - iommu_device_sysfs_remove(&obj->iommu); + if (obj->has_iommu_driver) + iommu_device_sysfs_remove(&obj->iommu); return err; } @@ -1256,10 +1255,10 @@ static void omap_iommu_remove(struct platform_device *pdev) { struct omap_iommu *obj = platform_get_drvdata(pdev); - if (obj->has_iommu_driver) { + if (obj->has_iommu_driver) iommu_device_sysfs_remove(&obj->iommu); - iommu_device_unregister(&obj->iommu); - } + + iommu_device_unregister(&obj->iommu); omap_iommu_debugfs_remove(obj); @@ -1723,12 +1722,19 @@ static void omap_iommu_release_device(struct device *dev) } +static int omap_iommu_of_xlate(struct device *dev, const struct of_phandle_args *args) +{ + /* TODO: collect args->np to save re-parsing in probe above */ + return 0; +} + static const struct iommu_ops omap_iommu_ops = { .identity_domain = &omap_iommu_identity_domain, .domain_alloc_paging = omap_iommu_domain_alloc_paging, .probe_device = omap_iommu_probe_device, .release_device = omap_iommu_release_device, .device_group = generic_single_device_group, + .of_xlate = omap_iommu_of_xlate, .pgsize_bitmap = OMAP_IOMMU_PGSIZES, .default_domain_ops = &(const struct iommu_domain_ops) { .attach_dev = omap_iommu_attach_dev,