101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
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/*
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* EEH functionality support for VFIO devices. The feature is only
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* available on sPAPR compatible platforms.
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*
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* Copyright Gavin Shan, IBM Corporation 2014.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/vfio.h>
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#include <asm/eeh.h>
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#define DRIVER_VERSION "0.1"
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#define DRIVER_AUTHOR "Gavin Shan, IBM Corporation"
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#define DRIVER_DESC "VFIO IOMMU SPAPR EEH"
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/* We might build address mapping here for "fast" path later */
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void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
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{
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eeh_dev_open(pdev);
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}
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EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
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void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
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{
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eeh_dev_release(pdev);
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}
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EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
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long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
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unsigned int cmd, unsigned long arg)
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{
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struct eeh_pe *pe;
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struct vfio_eeh_pe_op op;
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unsigned long minsz;
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long ret = -EINVAL;
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switch (cmd) {
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case VFIO_CHECK_EXTENSION:
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if (arg == VFIO_EEH)
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ret = eeh_enabled() ? 1 : 0;
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else
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ret = 0;
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break;
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case VFIO_EEH_PE_OP:
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pe = eeh_iommu_group_to_pe(group);
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if (!pe)
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return -ENODEV;
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minsz = offsetofend(struct vfio_eeh_pe_op, op);
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if (copy_from_user(&op, (void __user *)arg, minsz))
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return -EFAULT;
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if (op.argsz < minsz || op.flags)
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return -EINVAL;
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switch (op.op) {
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case VFIO_EEH_PE_DISABLE:
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ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
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break;
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case VFIO_EEH_PE_ENABLE:
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ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
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break;
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case VFIO_EEH_PE_UNFREEZE_IO:
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ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
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break;
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case VFIO_EEH_PE_UNFREEZE_DMA:
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ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
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break;
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case VFIO_EEH_PE_GET_STATE:
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ret = eeh_pe_get_state(pe);
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break;
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case VFIO_EEH_PE_RESET_DEACTIVATE:
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ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
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break;
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case VFIO_EEH_PE_RESET_HOT:
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ret = eeh_pe_reset(pe, EEH_RESET_HOT);
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break;
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case VFIO_EEH_PE_RESET_FUNDAMENTAL:
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ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
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break;
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case VFIO_EEH_PE_CONFIGURE:
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ret = eeh_pe_configure(pe);
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break;
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default:
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ret = -EINVAL;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
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MODULE_VERSION(DRIVER_VERSION);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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