Hi David, I love your patch! Yet something to improve: [auto build test ERROR on drm/drm-next] [also build test ERROR on v4.15-rc3 next-20171214] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/David-Rientjes/mm-mmu_notifier-annotate-mmu-notifiers-with-blockable-invalidate-callbacks/20171214-173044 base: git://people.freedesktop.org/~airlied/linux.git drm-next config: powerpc-defconfig (attached as .config) compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=powerpc All errors (new ones prefixed by >>): arch/powerpc/platforms/powernv/npu-dma.c: In function 'pnv_npu2_init_context': >> arch/powerpc/platforms/powernv/npu-dma.c:713:3: error: 'npu_content' undeclared (first use in this function); did you mean 'npu_context'? npu_content->mn.flags = MMU_INVALIDATE_MAY_BLOCK; ^~~~~~~~~~~ npu_context arch/powerpc/platforms/powernv/npu-dma.c:713:3: note: each undeclared identifier is reported only once for each function it appears in vim +713 arch/powerpc/platforms/powernv/npu-dma.c 639 640 /* 641 * Call into OPAL to setup the nmmu context for the current task in 642 * the NPU. This must be called to setup the context tables before the 643 * GPU issues ATRs. pdev should be a pointed to PCIe GPU device. 644 * 645 * A release callback should be registered to allow a device driver to 646 * be notified that it should not launch any new translation requests 647 * as the final TLB invalidate is about to occur. 648 * 649 * Returns an error if there no contexts are currently available or a 650 * npu_context which should be passed to pnv_npu2_handle_fault(). 651 * 652 * mmap_sem must be held in write mode. 653 */ 654 struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev, 655 unsigned long flags, 656 struct npu_context *(*cb)(struct npu_context *, void *), 657 void *priv) 658 { 659 int rc; 660 u32 nvlink_index; 661 struct device_node *nvlink_dn; 662 struct mm_struct *mm = current->mm; 663 struct pnv_phb *nphb; 664 struct npu *npu; 665 struct npu_context *npu_context; 666 667 /* 668 * At present we don't support GPUs connected to multiple NPUs and I'm 669 * not sure the hardware does either. 670 */ 671 struct pci_dev *npdev = pnv_pci_get_npu_dev(gpdev, 0); 672 673 if (!firmware_has_feature(FW_FEATURE_OPAL)) 674 return ERR_PTR(-ENODEV); 675 676 if (!npdev) 677 /* No nvlink associated with this GPU device */ 678 return ERR_PTR(-ENODEV); 679 680 if (!mm || mm->context.id == 0) { 681 /* 682 * Kernel thread contexts are not supported and context id 0 is 683 * reserved on the GPU. 684 */ 685 return ERR_PTR(-EINVAL); 686 } 687 688 nphb = pci_bus_to_host(npdev->bus)->private_data; 689 npu = &nphb->npu; 690 691 /* 692 * Setup the NPU context table for a particular GPU. These need to be 693 * per-GPU as we need the tables to filter ATSDs when there are no 694 * active contexts on a particular GPU. 695 */ 696 rc = opal_npu_init_context(nphb->opal_id, mm->context.id, flags, 697 PCI_DEVID(gpdev->bus->number, gpdev->devfn)); 698 if (rc < 0) 699 return ERR_PTR(-ENOSPC); 700 701 /* 702 * We store the npu pci device so we can more easily get at the 703 * associated npus. 704 */ 705 npu_context = mm->context.npu_context; 706 if (!npu_context) { 707 npu_context = kzalloc(sizeof(struct npu_context), GFP_KERNEL); 708 if (!npu_context) 709 return ERR_PTR(-ENOMEM); 710 711 mm->context.npu_context = npu_context; 712 npu_context->mm = mm; > 713 npu_content->mn.flags = MMU_INVALIDATE_MAY_BLOCK; 714 npu_context->mn.ops = &nv_nmmu_notifier_ops; 715 __mmu_notifier_register(&npu_context->mn, mm); 716 kref_init(&npu_context->kref); 717 } else { 718 kref_get(&npu_context->kref); 719 } 720 721 npu_context->release_cb = cb; 722 npu_context->priv = priv; 723 nvlink_dn = of_parse_phandle(npdev->dev.of_node, "ibm,nvlink", 0); 724 if (WARN_ON(of_property_read_u32(nvlink_dn, "ibm,npu-link-index", 725 &nvlink_index))) 726 return ERR_PTR(-ENODEV); 727 npu_context->npdev[npu->index][nvlink_index] = npdev; 728 729 if (!nphb->npu.nmmu_flush) { 730 /* 731 * If we're not explicitly flushing ourselves we need to mark 732 * the thread for global flushes 733 */ 734 npu_context->nmmu_flush = false; 735 mm_context_add_copro(mm); 736 } else 737 npu_context->nmmu_flush = true; 738 739 return npu_context; 740 } 741 EXPORT_SYMBOL(pnv_npu2_init_context); 742 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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