[linux.git] / drivers / vfio / vfio_spapr_eeh.c

/*
 * EEH functionality support for VFIO devices. The feature is only
 * available on sPAPR compatible platforms.
 *
 * Copyright Gavin Shan, IBM Corporation 2014.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include <asm/eeh.h>

#define DRIVER_VERSION	"0.1"
#define DRIVER_AUTHOR	"Gavin Shan, IBM Corporation"
#define DRIVER_DESC	"VFIO IOMMU SPAPR EEH"

/* We might build address mapping here for "fast" path later */
void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
{
	eeh_dev_open(pdev);
}
EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);

void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
{
	eeh_dev_release(pdev);
}
EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);

long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
				unsigned int cmd, unsigned long arg)
{
	struct eeh_pe *pe;
	struct vfio_eeh_pe_op op;
	unsigned long minsz;
	long ret = -EINVAL;

	switch (cmd) {
	case VFIO_CHECK_EXTENSION:
		if (arg == VFIO_EEH)
			ret = eeh_enabled() ? 1 : 0;
		else
			ret = 0;
		break;
	case VFIO_EEH_PE_OP:
		pe = eeh_iommu_group_to_pe(group);
		if (!pe)
			return -ENODEV;

		minsz = offsetofend(struct vfio_eeh_pe_op, op);
		if (copy_from_user(&op, (void __user *)arg, minsz))
			return -EFAULT;
		if (op.argsz < minsz || op.flags)
			return -EINVAL;

		switch (op.op) {
		case VFIO_EEH_PE_DISABLE:
			ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
			break;
		case VFIO_EEH_PE_ENABLE:
			ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
			break;
		case VFIO_EEH_PE_UNFREEZE_IO:
			ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
			break;
		case VFIO_EEH_PE_UNFREEZE_DMA:
			ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
			break;
		case VFIO_EEH_PE_GET_STATE:
			ret = eeh_pe_get_state(pe);
			break;
		case VFIO_EEH_PE_RESET_DEACTIVATE:
			ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
			break;
		case VFIO_EEH_PE_RESET_HOT:
			ret = eeh_pe_reset(pe, EEH_RESET_HOT);
			break;
		case VFIO_EEH_PE_RESET_FUNDAMENTAL:
			ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
			break;
		case VFIO_EEH_PE_CONFIGURE:
			ret = eeh_pe_configure(pe);
			break;
		case VFIO_EEH_PE_INJECT_ERR:
			minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
			if (op.argsz < minsz)
				return -EINVAL;
			if (copy_from_user(&op, (void __user *)arg, minsz))
				return -EFAULT;

			ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
						op.err.addr, op.err.mask);
			break;
		default:
			ret = -EINVAL;
		}
	}

	return ret;
}
EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);

MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
Commit	Line	Data
1b69be5e GS	1	/*
	2	* EEH functionality support for VFIO devices. The feature is only
	3	* available on sPAPR compatible platforms.
	4	*
	5	* Copyright Gavin Shan, IBM Corporation 2014.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
89a2edd6	12	#include <linux/module.h>
1b69be5e GS	13	#include <linux/uaccess.h>
	14	#include <linux/vfio.h>
	15	#include <asm/eeh.h>
	16
89a2edd6 AK	17	#define DRIVER_VERSION "0.1"
	18	#define DRIVER_AUTHOR "Gavin Shan, IBM Corporation"
	19	#define DRIVER_DESC "VFIO IOMMU SPAPR EEH"
	20
1b69be5e	21	/* We might build address mapping here for "fast" path later */
9b936c96	22	void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
1b69be5e	23	{
9b936c96	24	eeh_dev_open(pdev);
1b69be5e	25	}
92d18a68	26	EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
1b69be5e GS	27
	28	void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
	29	{
	30	eeh_dev_release(pdev);
	31	}
92d18a68	32	EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
1b69be5e GS	33
	34	long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
	35	unsigned int cmd, unsigned long arg)
	36	{
	37	struct eeh_pe *pe;
	38	struct vfio_eeh_pe_op op;
	39	unsigned long minsz;
	40	long ret = -EINVAL;
	41
	42	switch (cmd) {
	43	case VFIO_CHECK_EXTENSION:
	44	if (arg == VFIO_EEH)
	45	ret = eeh_enabled() ? 1 : 0;
	46	else
	47	ret = 0;
	48	break;
	49	case VFIO_EEH_PE_OP:
	50	pe = eeh_iommu_group_to_pe(group);
	51	if (!pe)
	52	return -ENODEV;
	53
	54	minsz = offsetofend(struct vfio_eeh_pe_op, op);
	55	if (copy_from_user(&op, (void __user *)arg, minsz))
	56	return -EFAULT;
	57	if (op.argsz < minsz \|\| op.flags)
	58	return -EINVAL;
	59
	60	switch (op.op) {
	61	case VFIO_EEH_PE_DISABLE:
	62	ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
	63	break;
	64	case VFIO_EEH_PE_ENABLE:
	65	ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
	66	break;
	67	case VFIO_EEH_PE_UNFREEZE_IO:
	68	ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
	69	break;
	70	case VFIO_EEH_PE_UNFREEZE_DMA:
	71	ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
	72	break;
	73	case VFIO_EEH_PE_GET_STATE:
	74	ret = eeh_pe_get_state(pe);
	75	break;
	76	case VFIO_EEH_PE_RESET_DEACTIVATE:
	77	ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
	78	break;
	79	case VFIO_EEH_PE_RESET_HOT:
	80	ret = eeh_pe_reset(pe, EEH_RESET_HOT);
	81	break;
	82	case VFIO_EEH_PE_RESET_FUNDAMENTAL:
	83	ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
	84	break;
	85	case VFIO_EEH_PE_CONFIGURE:
	86	ret = eeh_pe_configure(pe);
	87	break;
68cbbc3a GS	88	case VFIO_EEH_PE_INJECT_ERR:
	89	minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
	90	if (op.argsz < minsz)
	91	return -EINVAL;
	92	if (copy_from_user(&op, (void __user *)arg, minsz))
	93	return -EFAULT;
	94
	95	ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
	96	op.err.addr, op.err.mask);
	97	break;
1b69be5e GS	98	default:
	99	ret = -EINVAL;
	100	}
	101	}
	102
	103	return ret;
	104	}
0f905ce2	105	EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
89a2edd6 AK	106
	107	MODULE_VERSION(DRIVER_VERSION);
	108	MODULE_LICENSE("GPL v2");
	109	MODULE_AUTHOR(DRIVER_AUTHOR);
	110	MODULE_DESCRIPTION(DRIVER_DESC);