From 763fe0addb8fe15ccea67c0aebddc06f4bb25439 Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Wed, 6 Aug 2014 17:10:16 +1000 Subject: [PATCH] powerpc/powernv: Fix IOMMU group lost When we take full hotplug to recover from EEH errors, PCI buses could be involved. For the case, the child devices of involved PCI buses can't be attached to IOMMU group properly, which is caused by commit 3f28c5a ("powerpc/powernv: Reduce multi-hit of iommu_add_device()"). When adding the PCI devices of the newly created PCI buses to the system, the IOMMU group is expected to be added in (C). (A) fails to bind the IOMMU group because bus->is_added is false. (B) fails because the device doesn't have binding IOMMU table yet. bus->is_added is set to true at end of (C) and pdev->is_added is set to true at (D). pcibios_add_pci_devices() pci_scan_bridge() pci_scan_child_bus() pci_scan_slot() pci_scan_single_device() pci_scan_device() pci_device_add() pcibios_add_device() A: Ignore device_add() B: Ignore pcibios_fixup_bus() pcibios_setup_bus_devices() pcibios_setup_device() C: Hit pcibios_finish_adding_to_bus() pci_bus_add_devices() pci_bus_add_device() D: Add device If the parent PCI bus isn't involved in hotplug, the IOMMU group is expected to be bound in (B). (A) should fail as the sysfs entries aren't populated. The patch fixes the issue by reverting commit 3f28c5a and remove WARN_ON() in iommu_add_device() to allow calling the function even the specified device already has associated IOMMU group. Cc: # 3.16+ Reported-by: Thadeu Lima de Souza Cascardo Signed-off-by: Gavin Shan Acked-by: Wei Yang Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/iommu.c | 38 +++++++++++++---------- arch/powerpc/platforms/powernv/pci-ioda.c | 2 +- 2 files changed, 22 insertions(+), 18 deletions(-) diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index f84f799babb1..a10642a0d861 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -1120,37 +1120,41 @@ EXPORT_SYMBOL_GPL(iommu_release_ownership); int iommu_add_device(struct device *dev) { struct iommu_table *tbl; - int ret = 0; - if (WARN_ON(dev->iommu_group)) { - pr_warn("iommu_tce: device %s is already in iommu group %d, skipping\n", - dev_name(dev), - iommu_group_id(dev->iommu_group)); + /* + * The sysfs entries should be populated before + * binding IOMMU group. If sysfs entries isn't + * ready, we simply bail. + */ + if (!device_is_registered(dev)) + return -ENOENT; + + if (dev->iommu_group) { + pr_debug("%s: Skipping device %s with iommu group %d\n", + __func__, dev_name(dev), + iommu_group_id(dev->iommu_group)); return -EBUSY; } tbl = get_iommu_table_base(dev); if (!tbl || !tbl->it_group) { - pr_debug("iommu_tce: skipping device %s with no tbl\n", - dev_name(dev)); + pr_debug("%s: Skipping device %s with no tbl\n", + __func__, dev_name(dev)); return 0; } - pr_debug("iommu_tce: adding %s to iommu group %d\n", - dev_name(dev), iommu_group_id(tbl->it_group)); + pr_debug("%s: Adding %s to iommu group %d\n", + __func__, dev_name(dev), + iommu_group_id(tbl->it_group)); if (PAGE_SIZE < IOMMU_PAGE_SIZE(tbl)) { - pr_err("iommu_tce: unsupported iommu page size."); - pr_err("%s has not been added\n", dev_name(dev)); + pr_err("%s: Invalid IOMMU page size %lx (%lx) on %s\n", + __func__, IOMMU_PAGE_SIZE(tbl), + PAGE_SIZE, dev_name(dev)); return -EINVAL; } - ret = iommu_group_add_device(tbl->it_group, dev); - if (ret < 0) - pr_err("iommu_tce: %s has not been added, ret=%d\n", - dev_name(dev), ret); - - return ret; + return iommu_group_add_device(tbl->it_group, dev); } EXPORT_SYMBOL_GPL(iommu_add_device); diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index b136108ddc99..df241b11d4f7 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -857,7 +857,7 @@ static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev pe = &phb->ioda.pe_array[pdn->pe_number]; WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops); - set_iommu_table_base(&pdev->dev, &pe->tce32_table); + set_iommu_table_base_and_group(&pdev->dev, &pe->tce32_table); } static int pnv_pci_ioda_dma_set_mask(struct pnv_phb *phb, -- 2.34.1