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bh=L8S0ZnqopWvxV0k41s69onli9Jnj8oBzZN6pErAOoLQ=; b=dmj/H8eEzwhqLXzLH++9F6wUPVr6PmvIxHghUSHivzgkQ5Kx48gBkSeC NlmbyP+s5AFS5EAjtvZBAbK/5faOnG0wo+e5tORrlfSUHHestk4eQzagF HIJSeRzD1NOAwhUazgRxk+6o1v7+u2Y28bKLh7VI0aQjaRfn1lPhsurbX TcMO9j1tcdk4rIZ73yKAhtS6w5KwQVUk50aNueODxcQmfbFkFp4l2CuJL mQBrtyS9kqBl0TMs1oB8oJIEsPJTIboEuWJe40+RrtCZ31sUnKgVJWGAd lmfM7v/T4+PSk8tLK4MUjXv7ekP1awife40hm9Eaidak/5HaLTjtw0XG3 g==; X-IronPort-AV: E=McAfee;i="6600,9927,10967"; a="406566875" X-IronPort-AV: E=Sophos;i="6.05,226,1701158400"; d="scan'208";a="406566875" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jan 2024 19:49:32 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10967"; a="960775175" X-IronPort-AV: E=Sophos;i="6.05,226,1701158400"; d="scan'208";a="960775175" Received: from unknown (HELO ply01-vm-store.amr.corp.intel.com) ([10.238.153.201]) by orsmga005.jf.intel.com with ESMTP; 28 Jan 2024 19:49:28 -0800 From: Ethan Zhao To: baolu.lu@linux.intel.com, bhelgaas@google.com, robin.murphy@arm.com, jgg@ziepe.ca Cc: kevin.tian@intel.com, dwmw2@infradead.org, will@kernel.org, lukas@wunner.de, yi.l.liu@intel.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Ethan Zhao Subject: [PATCH v12 0/5] fix vt-d hard lockup when hotplug ATS capable device Date: Sun, 28 Jan 2024 22:49:19 -0500 Message-Id: <20240129034924.817005-1-haifeng.zhao@linux.intel.com> X-Mailer: git-send-email 2.31.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patchset is used to fix vt-d hard lockup reported when surprise unplug ATS capable endpoint device connects to system via PCIe switch as following topology. +-[0000:15]-+-00.0 Intel Corporation Ice Lake Memory Map/VT-d | +-00.1 Intel Corporation Ice Lake Mesh 2 PCIe | +-00.2 Intel Corporation Ice Lake RAS | +-00.4 Intel Corporation Device 0b23 | \-01.0-[16-1b]----00.0-[17-1b]--+-00.0-[18]----00.0 NVIDIA Corporation Device 2324 | +-01.0-[19]----00.0 Mellanox Technologies MT2910 Family [ConnectX-7] User brought endpoint device 19:00.0's link down by flapping it's hotplug capable slot 17:01.0 link control register, as sequence DLLSC response, pciehp_ist() will unload device driver and power it off, durning device driver is unloading an iommu device-TLB invalidation (Intel VT-d spec, or 'ATS Invalidation' in PCIe spec) request issued to that link down device, thus a long time completion/timeout waiting in interrupt context causes continuous hard lockup warnning and system hang. Other detail, see every patch commit log. patch [1&2] were tested by yehaorong@bytedance.com on stable v6.7-rc4. patch [1-5] passed compiling on stable v6.8-rc2. change log: v12: - use base-commit tag to format patch. - fix building issue on v6.8-rc2 repported by lkp@intel.com. v11: - update per latest comment and suggestion from Baolu and YiLiu. - split refactoring patch into two patches, [3/5] for simplify parameters and [4/5] for pdev parameter passing. - re-order patches. - fold target device presence check into qi_check_fault(). - combine patch[2][5] in v10 into one patch[5]. - some commit description correctness. - add fixes tag to patch[2/5]. - rebased on 6.8rc1 v10: - refactor qi_submit_sync() and its callers to get pci_dev instance, as Kevin pointed out add target_flush_dev to iommu is not right. v9: - unify all spelling of ATS Invalidation adhere to PCIe spec per Bjorn's suggestion. v8: - add a patch to break the loop for timeout device-TLB invalidation, as Bjorn said there is possibility device just no response but not gone. v7: - reorder patches and revise commit log per Bjorn's guide. - other code and commit log revise per Lukas' suggestion. - rebased to stable v6.7-rc6. v6: - add two patches to break out device-TLB invalidation if device is gone. v5: - add a patch try to fix the rare case (surprise remove a device in safe removal process). not work because surprise removal handling can't re-enter when another safe removal is in process. v4: - move the PCI device state checking after ATS per Baolu's suggestion. v3: - fix commit description typo. v2: - revise commit[1] description part according to Lukas' suggestion. - revise commit[2] description to clarify the issue's impact. v1: - https://lore.kernel.org/lkml/20231213034637.2603013-1-haifeng.zhao@ linux.intel.com/T/ Thanks, Ethan Ethan Zhao (5): PCI: make pci_dev_is_disconnected() helper public for other drivers iommu/vt-d: don't issue ATS Invalidation request when device is disconnected iommu/vt-d: simplify parameters of qi_submit_sync() ATS invalidation callers iommu/vt-d: pass pdev parameter for qi_check_fault() and refactor callers iommu/vt-d: improve ITE fault handling if target device isn't present drivers/iommu/intel/dmar.c | 71 +++++++++++++++++++++++------ drivers/iommu/intel/iommu.c | 29 +++--------- drivers/iommu/intel/iommu.h | 20 ++++---- drivers/iommu/intel/irq_remapping.c | 2 +- drivers/iommu/intel/nested.c | 9 +--- drivers/iommu/intel/pasid.c | 12 ++--- drivers/iommu/intel/svm.c | 23 +++++----- drivers/pci/pci.h | 5 -- include/linux/pci.h | 5 ++ 9 files changed, 98 insertions(+), 78 deletions(-) base-commit: 41bccc98fb7931d63d03f326a746ac4d429c1dd3 -- 2.31.1