[linux-2.6-block.git] / drivers / vfio / vfio_spapr_eeh.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * EEH functionality support for VFIO devices. The feature is only
 * available on sPAPR compatible platforms.
 *
 * Copyright Gavin Shan, IBM Corporation 2014.
 */

#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, true);
			break;
		case VFIO_EEH_PE_RESET_HOT:
			ret = eeh_pe_reset(pe, EEH_RESET_HOT, true);
			break;
		case VFIO_EEH_PE_RESET_FUNDAMENTAL:
			ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL, true);
			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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
1b69be5e GS	2	/*
	3	* EEH functionality support for VFIO devices. The feature is only
	4	* available on sPAPR compatible platforms.
	5	*
	6	* Copyright Gavin Shan, IBM Corporation 2014.
1b69be5e GS	7	*/
1b69be5e GS	8
89a2edd6	9	#include <linux/module.h>
1b69be5e GS	10	#include <linux/uaccess.h>
	11	#include <linux/vfio.h>
	12	#include <asm/eeh.h>
	13
89a2edd6 AK	14	#define DRIVER_VERSION "0.1"
	15	#define DRIVER_AUTHOR "Gavin Shan, IBM Corporation"
	16	#define DRIVER_DESC "VFIO IOMMU SPAPR EEH"
	17
1b69be5e	18	/* We might build address mapping here for "fast" path later */
9b936c96	19	void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
1b69be5e	20	{
9b936c96	21	eeh_dev_open(pdev);
1b69be5e	22	}
92d18a68	23	EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
1b69be5e GS	24
	25	void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
	26	{
	27	eeh_dev_release(pdev);
	28	}
92d18a68	29	EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
1b69be5e GS	30
	31	long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
	32	unsigned int cmd, unsigned long arg)
	33	{
	34	struct eeh_pe *pe;
	35	struct vfio_eeh_pe_op op;
	36	unsigned long minsz;
	37	long ret = -EINVAL;
	38
	39	switch (cmd) {
	40	case VFIO_CHECK_EXTENSION:
	41	if (arg == VFIO_EEH)
	42	ret = eeh_enabled() ? 1 : 0;
	43	else
	44	ret = 0;
	45	break;
	46	case VFIO_EEH_PE_OP:
	47	pe = eeh_iommu_group_to_pe(group);
	48	if (!pe)
	49	return -ENODEV;
	50
	51	minsz = offsetofend(struct vfio_eeh_pe_op, op);
	52	if (copy_from_user(&op, (void __user *)arg, minsz))
	53	return -EFAULT;
	54	if (op.argsz < minsz \|\| op.flags)
	55	return -EINVAL;
	56
	57	switch (op.op) {
	58	case VFIO_EEH_PE_DISABLE:
	59	ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
	60	break;
	61	case VFIO_EEH_PE_ENABLE:
	62	ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
	63	break;
	64	case VFIO_EEH_PE_UNFREEZE_IO:
	65	ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
	66	break;
	67	case VFIO_EEH_PE_UNFREEZE_DMA:
	68	ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
	69	break;
	70	case VFIO_EEH_PE_GET_STATE:
	71	ret = eeh_pe_get_state(pe);
	72	break;
	73	case VFIO_EEH_PE_RESET_DEACTIVATE:
1ef52073	74	ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, true);
1b69be5e GS	75	break;
1b69be5e GS	76	case VFIO_EEH_PE_RESET_HOT:
1ef52073	77	ret = eeh_pe_reset(pe, EEH_RESET_HOT, true);
1b69be5e GS	78	break;
1b69be5e GS	79	case VFIO_EEH_PE_RESET_FUNDAMENTAL:
1ef52073	80	ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL, true);
1b69be5e GS	81	break;
	82	case VFIO_EEH_PE_CONFIGURE:
	83	ret = eeh_pe_configure(pe);
	84	break;
68cbbc3a GS	85	case VFIO_EEH_PE_INJECT_ERR:
	86	minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
	87	if (op.argsz < minsz)
	88	return -EINVAL;
	89	if (copy_from_user(&op, (void __user *)arg, minsz))
	90	return -EFAULT;
	91
	92	ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
	93	op.err.addr, op.err.mask);
	94	break;
1b69be5e GS	95	default:
	96	ret = -EINVAL;
	97	}
	98	}
	99
	100	return ret;
	101	}
0f905ce2	102	EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
89a2edd6 AK	103
	104	MODULE_VERSION(DRIVER_VERSION);
	105	MODULE_LICENSE("GPL v2");
	106	MODULE_AUTHOR(DRIVER_AUTHOR);
	107	MODULE_DESCRIPTION(DRIVER_DESC);