From nobody Tue Feb 10 10:54:56 2026 Received: from out-176.mta0.migadu.com (out-176.mta0.migadu.com [91.218.175.176]) (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 B16482580D4 for ; Mon, 10 Feb 2025 19:40:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739216432; cv=none; b=lj1J0IEXfdt+lHmQvAQMP/r4L8s1iBfQFrrpEcLcLJGaSfOShS6do9XLOpuYJgAg25T1+6HPlBr6ktlnpmbB/ntZzfuK3Slre+Ztlqdam3UVpeyaWVi7HdibAQe8m+cT1nLSj7faFPoYB58xZsJM66IaK9R5EKA1Q1WyJMHwKPw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739216432; c=relaxed/simple; bh=apwlrHK+NFmUFcATPM4IEl3yfbQ24a1UqxWS9zc+/wc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=QCynVTdEIbmv61uzwM7AllouZf5MyaXtbkbFNJ0xEjqkl430SZLPcEClniVBIfG2zku6v9vHy2XIDy5xzboqEAIyVzodUGYl9apnDHrEGSoCM6yBA/3AX3mfEBYAhav1lZiVJP1KxsuEBg60uGPK7YIudz7QIGaSkStLPUunMJs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=rosenzweig.io; spf=pass smtp.mailfrom=rosenzweig.io; dkim=pass (2048-bit key) header.d=rosenzweig.io header.i=@rosenzweig.io header.b=mEB+Xkj8; arc=none smtp.client-ip=91.218.175.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=rosenzweig.io Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rosenzweig.io Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rosenzweig.io header.i=@rosenzweig.io header.b="mEB+Xkj8" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rosenzweig.io; s=key1; t=1739216428; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lOD2Sq5+ZH4AcnNDOmSUoO/ljPGq1eIifxgBsdfQLiY=; b=mEB+Xkj8T8zGigBKiyv7FB06VJrCxIGpILs21+CpcutU5jlc0MWNb1aUfNlgnvwcp5Zwub psyi+BgX8tRe1LYfw35T0eLHelVndz55BfAqxCuXw8Ecyw0yPUbJcHTsJmD9mZhEfT9DdP bIEZWiNNb4U52rCnloNeb9NjZMv1yOVQTL5x3mbfRvc+Mc+xFEwZJkf8kk25clMtRcvDa9 IRYHl+O2rWr+dmA452gcgDFHawO8b09IezIHm3NA553dfTGiaPHi47vRE5ObJdaO0iIQVI T45sAe5S5uPg7yezUVNN8zVAS4XMYpOxL9Fw2Ebw1edHwxE2E2qT4Jho5N5uyA== From: Alyssa Rosenzweig Date: Mon, 10 Feb 2025 14:39:57 -0500 Subject: [PATCH 5/5] iommu/dart: Assert !locked when configuring 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: quoted-printable Message-Id: <20250210-locked-dart-v1-5-5d97fe247f35@rosenzweig.io> References: <20250210-locked-dart-v1-0-5d97fe247f35@rosenzweig.io> In-Reply-To: <20250210-locked-dart-v1-0-5d97fe247f35@rosenzweig.io> To: Sven Peter , Janne Grunau , Joerg Roedel , Will Deacon , Robin Murphy Cc: asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Alyssa Rosenzweig X-Developer-Signature: v=1; a=openpgp-sha256; l=2308; i=alyssa@rosenzweig.io; h=from:subject:message-id; bh=apwlrHK+NFmUFcATPM4IEl3yfbQ24a1UqxWS9zc+/wc=; b=owEBbQKS/ZANAwAIAf7+UFoK9VgNAcsmYgBnqlYZdwU6iimgUcyo61wE4/xA3zJtr53OpF+Dx ctCIBx48SSJAjMEAAEIAB0WIQRDXuCbsK8A0B2q9jj+/lBaCvVYDQUCZ6pWGQAKCRD+/lBaCvVY DVycD/49tr1weIxdnNGNmj3jpsXXmZOfwks2OSyN89yavv1Na4aT4E+O2fNw3BRnk1VspirBigp ll9E48WekXnXMa8kQxS/2I1/aYigRPd2T4L2iiKbxPEi8UCNQgbAqGlHGxvqhCLvvYh+2aiDLpv xH2nW+kMVzdMlunP7GVyAZZvOyCG2RtlbboG0Qj5J4G3nZpDU6AaDXYbHX1a4FzTsPS0LqiTnpt qUqjp6NjnCOMaQlHvKIjhf83bVlSMr7tzYIhdzb80lX/ZAJGtOhM5feKQyeF9wkfVhaFtU/pN4V 35/in4R1dTefaMz6tsoF3MBj/m44M8slSaK86gCIePgTWDpr+e6z8wqy8fjqgghaxlNuV7f1wMz 34yVh6f/hp1tQn0C7xlKfF1rhCAk+LblHY9/U2CLdt85dWhLBFnANsyPpPgMCqqp0z6G2pqYGOB qz1a1oPkM8XMYzed6vENNWVflXNkAYPcHfY1/tXCck/4jWHVdfp7ZUaCDX6wTFBOMHKy9LVPJsl UBZX50SMZJhbfMPNyhvJFTuPc3c0W4HFibXi+NA2Pw92klqA2ja8fy8CQ6hOMYf+PvjKayDLUZv lil/vSW3MdZk8Hee4FrkwJv+iftK+Js8/p9i3HQRHdzCNRXjNkiTXHTc6x/iYwiWIWIM3oaGoWz T6IiGUagk+V8YCw== X-Developer-Key: i=alyssa@rosenzweig.io; a=openpgp; fpr=435EE09BB0AF00D01DAAF638FEFE505A0AF5580D X-Migadu-Flow: FLOW_OUT Configuration is only possible and needed for non-locked DARTs and will fail for locked DARTs. We cannot try -- assert that we do not. Signed-off-by: Alyssa Rosenzweig --- drivers/iommu/apple-dart.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 29b627b38e8c37afd2b6a72865f43d24b633834a..87eb87bb2f5158d000a2c2fc801= b722a2262c941 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -309,6 +309,7 @@ apple_dart_hw_enable_translation(struct apple_dart_stre= am_map *stream_map) struct apple_dart *dart =3D stream_map->dart; int sid; =20 + WARN_ON(stream_map->dart->locked); for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) writel(dart->hw->tcr_enabled, dart->regs + DART_TCR(dart, sid)); } @@ -318,6 +319,7 @@ static void apple_dart_hw_disable_dma(struct apple_dart= _stream_map *stream_map) struct apple_dart *dart =3D stream_map->dart; int sid; =20 + WARN_ON(stream_map->dart->locked); for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) writel(dart->hw->tcr_disabled, dart->regs + DART_TCR(dart, sid)); } @@ -328,7 +330,7 @@ apple_dart_hw_enable_bypass(struct apple_dart_stream_ma= p *stream_map) struct apple_dart *dart =3D stream_map->dart; int sid; =20 - WARN_ON(!stream_map->dart->supports_bypass); + WARN_ON(stream_map->dart->locked || !stream_map->dart->supports_bypass); for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) writel(dart->hw->tcr_bypass, dart->regs + DART_TCR(dart, sid)); @@ -340,6 +342,7 @@ static void apple_dart_hw_set_ttbr(struct apple_dart_st= ream_map *stream_map, struct apple_dart *dart =3D stream_map->dart; int sid; =20 + WARN_ON(stream_map->dart->locked); WARN_ON(paddr & ((1 << dart->hw->ttbr_shift) - 1)); for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) writel(dart->hw->ttbr_valid | @@ -353,6 +356,7 @@ static void apple_dart_hw_clear_ttbr(struct apple_dart_= stream_map *stream_map, struct apple_dart *dart =3D stream_map->dart; int sid; =20 + WARN_ON(stream_map->dart->locked); for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) writel(0, dart->regs + DART_TTBR(dart, sid, idx)); } --=20 2.48.1