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bh=IRW1uC71joWZcrsE1fj7twP6y+QOF1/7H0nNSSijBHE=; b=BxuuILldvkA+T2BP089Np3g0FMvUtjSBkHSt0YkVHgDiPIvy+PCkjDEy tQdnzQ0JAjyJW24ZwRuYZP4s7uBe9WR0GzOXkIZgipEZPvuontUVL1QJk 0/DIDAUnpUpCHjF48c8aU1tG273a0WwyKb/DJy0pbhaMM5x+PVHg8y3W9 tIQEQoNUxOYwQVGRemEmjT8cHM2x7IIWgsYoCfsg1RvwPYK+iHMriwKHu Kjjoq3jF6gwiT5deQnt83PHhn6BwdZHRvyk6nfEqh4DC6b6QD+RpjGaKw kjLa/bQV/CBEX/QQT0e61mVxm4AIjufDFDZEIyCiK1kzstfdYe8m1JqxX A==; X-IronPort-AV: E=McAfee;i="6600,9927,10991"; a="25264404" X-IronPort-AV: E=Sophos;i="6.06,177,1705392000"; d="scan'208";a="25264404" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2024 01:03:10 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,177,1705392000"; d="scan'208";a="10122584" Received: from unknown (HELO ply01-vm-store.amr.corp.intel.com) ([10.238.153.201]) by orviesa003.jf.intel.com with ESMTP; 22 Feb 2024 01:03:05 -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, dan.carpenter@linaro.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Ethan Zhao Subject: [PATCH v13 0/3] fix vt-d hard lockup when hotplug ATS capable device Date: Thu, 22 Feb 2024 04:02:48 -0500 Message-Id: <20240222090251.2849702-1-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 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791602921721705436 X-GMAIL-MSGID: 1791602921721705436 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 [1-3] passed compiling on stable v6.8-rc4 (Baolu's rbtree branch). change log: v13: - rebased on Baolu's rbtree patchset. - removed refactor patches [3/5][4/5] in v12. - amend commit description of patch[3/3]. v12: - use base-commit tag to format patch. - fix building issue on v6.8-rc2 repported by lkp@intel.com. - https://lkml.org/lkml/2024/1/28/535 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 - https://lkml.org/lkml/2024/1/25/1314 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 (3): 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: improve ITE fault handling if target device isn't valid drivers/iommu/intel/dmar.c | 25 +++++++++++++++++++++++++ drivers/iommu/intel/pasid.c | 3 +++ drivers/pci/pci.h | 5 ----- include/linux/pci.h | 5 +++++ 4 files changed, 33 insertions(+), 5 deletions(-) base-commit: e60bf5aa1a74c0652cd12d0cdc02f5c2b5fe5c74