From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f197.google.com (mail-pg1-f197.google.com [209.85.215.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5409B41F35A for ; Tue, 29 Sep 2026 03:45:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790653544; cv=none; b=DRhn9b0B0KoDsLIVmPt/RZPb53u4RGNo/9bdYKRn4zlCvEalMS61kq8m/oj/eCByRNUrfzppZAfn958SO07ptxR99bwsj06ZtPanJLnoV63C97327OsTuFSOZ6vfRUXFVwCvre3PDmDo2o6vY4bWBzNQ+adx7yZuOrRX4gw7yPY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790653544; c=relaxed/simple; bh=rAWcJCCi9A6gOKRWLlYQUftC1yte/SSOlRW13UF9bXE=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=boxdEvYzecF9ohfB5BVLIUePWyXWqJOsEchG1vEYK9X49yQfkYMtqR+xZIYPpD0t2r+jK426uj3PiOjMm1Tk1Dul26AfOTaKIL0pshTnsYcNjbc4vh2OY44FLSkJjTe4dlDV6cLXVdgWUAm+ZIejTx6ZBS7Dyfa/koXH0Ng5kWU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--praan.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=c3xOJAiY; arc=none smtp.client-ip=209.85.215.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--praan.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="c3xOJAiY" Received: by mail-pg1-f197.google.com with SMTP id 41be03b00d2f7-cc11b5dd54dso5561279a12.3 for ; Mon, 28 Sep 2026 20:45:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1790653541; x=1791258341; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=HWQbzPnJHI/UQ6xRoFaSMFgVnf7una/rhjMJI3MVJUs=; b=c3xOJAiYJn/H0KP2MbTzcwR/RMumzuNPOvcaY/FB93FIUN/wkwX7+ZQiS0HmCTRnog oVOTEn6bdub4oenhg+T4SAhVVfRs7mxE6hSEKj5St4CQpp12ejyXccnBVy/CTBhU80D3 AKrj2vtgYLtnhSVyamqSooPALVCzrpLUe7MeuLdqAd+fDAZSUJhjxeISOHILpzowc/1f sPu9s6CO1w1dSOKIyAB9LEdCEXdE13DHMxq2chPXrDe9QzMTsA5Q3HBSN4CndVhKWGMU NQ7+ZJFU9d87RsHnS6Mwos8Sm+h6L408C7ONZSDIjui3RZJjXKV/TCnhCiLdevEkwahY b9kg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790653541; x=1791258341; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=HWQbzPnJHI/UQ6xRoFaSMFgVnf7una/rhjMJI3MVJUs=; b=ygXP1HIKoKM7dhjPGb5UUafc/WNK4WTbCMjm+aCthsMgyGKJRcl5LXsAbcuYJOcuoz 3btdtb41TyAe5p8V2VLJsSN4aDu+qApkskKxjId3MNrgCFiYdiQufD4wwzYFSxxOOlgF DPevpBUbnhWEWc/hwaDOc0Znqeu0FumD8QIwWrvyM7oT82I2wEQVbM3fyNrkTo6TXddw NzH4ZID9txY9avmg0NmdGZnePzd0rI6vroL/DBqNbtHKwXY9K/CiJCSE9JXCO8nqVtEF U++2vJgI9MdCGWc0RU+Tv+RpKClof2AZYzUR8BeY64v6zYeDx88BhuYh8A964zUFiaDc MT+Q== X-Forwarded-Encrypted: i=1; AKwUvBx09DVbkbhB0ofa+3BWNDXSOr2RZtvu5qagQDEW3DJYysJ1I+uKSznGX4a5Cj3iW8IzP1cCP/22d5A=@vger.kernel.org X-Gm-Message-State: AFuF++kpnMfRQCWHdTOginAZd+a6ZhZm7bbS5Ej0W4056+Q0C/mUQmQM uzAeUtPGOhg0zjWPTKdMmsyNztpRzzotBLcREQxl1imNQVKNJq5booJ3iKtJcIuno599ZHJJqdm /2A== X-Received: from pgc13.prod.google.com ([2002:a05:6a02:2f8d:b0:cc7:4d12:8a9a]) (user=praan job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:4324:b0:3d1:e510:9052 with SMTP id adf61e73a8af0-3de0e6f3973mr13463950637.7.1790653541112; Mon, 28 Sep 2026 20:45:41 -0700 (PDT) Date: Tue, 29 Sep 2026 03:45:03 +0000 In-Reply-To: <20260929034510.2023173-1-praan@google.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260929034510.2023173-1-praan@google.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog Message-ID: <20260929034510.2023173-10-praan@google.com> Subject: [PATCH v11 09/16] iommu/arm-smmu-v3: Restore MSI config on resume From: Pranjal Shrivastava To: iommu@lists.linux.dev Cc: Will Deacon , Joerg Roedel , Robin Murphy , Jason Gunthorpe , Mostafa Saleh , Nicolin Chen , Daniel Mentz , Ashish Mhetre , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Radu Rendec , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , rafael@kernel.org, Danilo Krummrich , driver-core@lists.linux.dev, Pranjal Shrivastava Content-Type: text/plain; charset="UTF-8" The SMMU's MSI configuration registers (*_IRQ_CFGn) containing target address, data and memory attributes lose their state when the SMMU is powered down. Introduce arm_smmu_resume_msis() to zero the *_IRQ_CFG0 registers (which reset to unknown values) and restore the cached MSI messages across the device's MSI domain via msi_device_domain_restore_msi_msgs(). In addition, clear ARM_SMMU_FEAT_MSI if MSI setup fails and the driver falls back to wired IRQs, preventing spurious MSI resume attempts. Reviewed-by: Nicolin Chen Reviewed-by: Mostafa Saleh Signed-off-by: Pranjal Shrivastava --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index dc2fc02b5163..7347d3ecdae8 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -4779,6 +4779,19 @@ static void arm_smmu_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg) writel_relaxed(ARM_SMMU_MEMATTR_DEVICE_nGnRE, smmu->base + cfg[2]); } +static void __maybe_unused arm_smmu_resume_msis(struct arm_smmu_device *smmu) +{ + /* Clear the MSI address regs as they reset to unknown value */ + writeq_relaxed(0, smmu->base + ARM_SMMU_GERROR_IRQ_CFG0); + writeq_relaxed(0, smmu->base + ARM_SMMU_EVTQ_IRQ_CFG0); + + if (smmu->features & ARM_SMMU_FEAT_PRI) + writeq_relaxed(0, smmu->base + ARM_SMMU_PRIQ_IRQ_CFG0); + + /* No-op if no MSI device domain was instantiated (e.g. wired IRQs) */ + msi_device_domain_restore_msi_msgs(smmu->dev, MSI_DEFAULT_DOMAIN); +} + static void arm_smmu_setup_msis(struct arm_smmu_device *smmu) { int ret, nvec = ARM_SMMU_MAX_MSIS; -- 2.56.0.rc1.315.gc6ed9934b7-goog