From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D61AF3A4F23; Thu, 20 Aug 2026 19:12:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787253128; cv=none; b=r7q6s9FH+Y+fmfc5W0sk7Fuam9zWoe/+9IwcYxfSKwDJ1iMr+yFHgrV1x4IUcNd5pzcahITFchRaXOHp3sKJcLmMCHiRO7L9TjVBCzAYpKjRUz4PuL8OvvOdaj71vysE+AIulvd4z1sBmycgvWXE9EBdQs3a6QzG+yB5lP8L9wQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787253128; c=relaxed/simple; bh=ksXb9ni7G9dqEx6LwsW4bBnhqCsne0tIy7naRonbgIY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=CGQp0I+sezpn27DwQVE9DfeEHxWaa+eiDNcN40FUI+1T3J/fVji/KfZwawAd/mD9IqIIKymQTE/9rL8bC2Xe2e/n047ExgLwx8DH833we0XtxHSROo23Sw6aBa9NyQHAXzRwwy528fNSzfd4fQxE/ScZitYMMUahcC7A0/m1H90= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jwqXTZF3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jwqXTZF3" Received: by smtp.kernel.org (Postfix) with ESMTPS id 6E8FDC2BCC7; Thu, 20 Aug 2026 19:12:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1787253128; bh=ksXb9ni7G9dqEx6LwsW4bBnhqCsne0tIy7naRonbgIY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=jwqXTZF3KIEQx7y1BPdHwHBcL8P6vtg0jNNIRwLI78V6e6PlRCCWte/vIsoSQAywr hhh9hzwPWcCmBQFAP4sjUF9ZtSQUuvbG/OQEc4fEFV3aRqmDt6nlDPugBshQw6saKf MYf1ZXKGTHwDUR+qxV+WoKq7E8ixwzU5czvH2SoKyR461HqSl0Sa2J/BCQ9PlBSm9Y 0Uoc+46mH9SC82te0MM7ZyOVoBT7cOfvlNnF3IZo8QSFBNc+DPLo5A/3utjSR4iRUs c9TcbL2qUBLHO8OGdrQfwKMDd1i4cuOTZPJ5DQAo21bA71tmQcHz9+KTfYlGVeSO6W 78LL86kt51O6A== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4CAA6C5DF86; Thu, 20 Aug 2026 19:12:08 +0000 (UTC) From: Markuss Broks via B4 Relay Date: Thu, 20 Aug 2026 22:12:05 +0300 Subject: [PATCH 1/4] iommu/exynos: detect SysMMUs without BLOCK mode Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260820-exynos-iommu-fixes-v1-1-6bbcd673bb15@gmail.com> References: <20260820-exynos-iommu-fixes-v1-0-6bbcd673bb15@gmail.com> In-Reply-To: <20260820-exynos-iommu-fixes-v1-0-6bbcd673bb15@gmail.com> To: Marek Szyprowski , "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , Krzysztof Kozlowski , Peter Griffin , Alim Akhtar Cc: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Markuss Broks X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787253126; l=1479; i=markuss.broks@gmail.com; s=20260803; h=from:subject:message-id; bh=mOr89jBc1c/3DemuQ56Wmn7lSeAvv7DoZx+sJdo6D2U=; b=6nEHQ0bpJYt2EXU7sB+pTrh8uM4qqZlYciy0rMZ3uIIw056/blzZCqnEYUw/BlDczramgZk8s D+ueRGcYxxyB9FQi32Q0zQlCTS+8SQDf1EHZSuOANkujC0hVsTMRojF X-Developer-Key: i=markuss.broks@gmail.com; a=ed25519; pk=oKzGUTm30BCDqinRMpiHQqByOx1mp2mwmhg80Mv7Zg4= X-Endpoint-Received: by B4 Relay for markuss.broks@gmail.com/20260803 with auth_id=911 X-Original-From: Markuss Broks Reply-To: markuss.broks@gmail.com From: Markuss Broks Newer SysMMU instances may not implement BLOCK mode: writing CTRL_BLOCK does not stop translation, and MMU_STATUS never reports a blocked state. The hardware advertises this in CAPA1 bit 15, which the vendor driver reads as MMU_CAPA1_NO_BLOCK_MODE; the SysMMUs on Exynos8835 are such instances. Signed-off-by: Markuss Broks --- drivers/iommu/exynos-iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 874d05f4b396..0319da9fd831 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -143,6 +143,7 @@ static u32 lv2ent_offset(sysmmu_iova_t iova) #define CTRL_VM_FAULT_MODE_STALL BIT(3) #define CAPA0_CAPA1_EXIST BIT(11) #define CAPA1_VCR_ENABLED BIT(14) +#define CAPA1_NO_BLOCK_MODE BIT(15) /* common registers */ #define REG_MMU_CTRL 0x000 @@ -306,6 +307,7 @@ struct sysmmu_drvdata { /* v7 fields */ bool has_vcr; /* virtual machine control register */ + bool no_block; /* BLOCK mode not implemented */ }; #define SYSMMU_REG(data, reg) ((data)->sfrbase + (data)->variant->reg) @@ -511,6 +513,7 @@ static void __sysmmu_get_vcr(struct sysmmu_drvdata *data) u32 capa1 = readl(data->sfrbase + REG_V7_CAPA1); data->has_vcr = capa1 & CAPA1_VCR_ENABLED; + data->no_block = capa1 & CAPA1_NO_BLOCK_MODE; } static void __sysmmu_get_version(struct sysmmu_drvdata *data) -- 2.55.0