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Date: Mon, 17 Feb 2020 20:38:56 +0100 From: Joerg Roedel <joro@...tes.org> To: Lu Baolu <baolu.lu@...ux.intel.com>, David Woodhouse <dwmw2@...radead.org> Cc: Joerg Roedel <joro@...tes.org>, jroedel@...e.de, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org Subject: [PATCH 3/5] iommu/vt-d: Do deferred attachment in iommu_need_mapping() From: Joerg Roedel <jroedel@...e.de> The attachment of deferred devices needs to happen before the check whether the device is identity mapped or not. Otherwise the check will return wrong results, cause warnings boot failures in kdump kernels, like WARNING: CPU: 0 PID: 318 at ../drivers/iommu/intel-iommu.c:592 domain_get_iommu+0x61/0x70 [...] Call Trace: __intel_map_single+0x55/0x190 intel_alloc_coherent+0xac/0x110 dmam_alloc_attrs+0x50/0xa0 ahci_port_start+0xfb/0x1f0 [libahci] ata_host_start.part.39+0x104/0x1e0 [libata] With the earlier check the kdump boot succeeds and a crashdump is written. Signed-off-by: Joerg Roedel <jroedel@...e.de> --- drivers/iommu/intel-iommu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 42cdcce1602e..32f43695a22b 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2541,9 +2541,6 @@ static void do_deferred_attach(struct device *dev) static struct dmar_domain *deferred_attach_domain(struct device *dev) { - if (unlikely(attach_deferred(dev))) - do_deferred_attach(dev); - return find_domain(dev); } @@ -3595,6 +3592,9 @@ static bool iommu_need_mapping(struct device *dev) if (iommu_dummy(dev)) return false; + if (unlikely(attach_deferred(dev))) + do_deferred_attach(dev); + ret = identity_mapping(dev); if (ret) { u64 dma_mask = *dev->dma_mask; -- 2.17.1
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