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iommu/vt-d: Improve ITE fault handling if target device isn't present
[ Upstream commit 80a9b50c0b9e297669a8a400eb35468cd87a9aed ] Because surprise removal could happen anytime, e.g. user could request safe removal to EP(endpoint device) via sysfs and brings its link down to do surprise removal cocurrently. such aggressive cases would cause ATS invalidation request issued to non-existence target device, then deadly loop to retry that request after ITE fault triggered in interrupt context. this patch aims to optimize the ITE handling by checking the target device presence state to avoid retrying the timeout request blindly, thus avoid hard lockup or system hang. Devices TLB should only be invalidated when devices are in the iommu->device_rbtree (probed, not released) and present. Fixes: 6ba6c3a ("VT-d: add device IOTLB invalidation support") Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org> Signed-off-by: Ethan Zhao <haifeng.zhao@linux.intel.com> Link: https://lore.kernel.org/r/20240301080727.3529832-4-haifeng.zhao@linux.intel.com Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
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