[PATCH 3/8] drivers/vfio: New IOCTL command VFIO_EEH_INFO
Gavin Shan
gwshan at linux.vnet.ibm.com
Wed May 14 14:11:57 EST 2014
The patch adds new IOCTL command VFIO_EEH_INFO to VFIO container
to support EEH functionality for PCI devices, which have been
passed from host to guest via VFIO.
Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/Makefile | 1 +
arch/powerpc/platforms/powernv/eeh-vfio.c | 593 ++++++++++++++++++++++++++++++
drivers/vfio/vfio_iommu_spapr_tce.c | 12 +
include/uapi/linux/vfio.h | 57 +++
4 files changed, 663 insertions(+)
create mode 100644 arch/powerpc/platforms/powernv/eeh-vfio.c
diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 63cebb9..2b15a03 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -6,5 +6,6 @@ obj-y += opal-msglog.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o
obj-$(CONFIG_EEH) += eeh-ioda.o eeh-powernv.o
+obj-$(CONFIG_VFIO_EEH) += eeh-vfio.o
obj-$(CONFIG_PPC_SCOM) += opal-xscom.o
obj-$(CONFIG_MEMORY_FAILURE) += opal-memory-errors.o
diff --git a/arch/powerpc/platforms/powernv/eeh-vfio.c b/arch/powerpc/platforms/powernv/eeh-vfio.c
new file mode 100644
index 0000000..69d5f2d
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/eeh-vfio.c
@@ -0,0 +1,593 @@
+/*
+ * The file intends to support EEH funtionality for those PCI devices,
+ * which have been passed through from host to guest via VFIO. So this
+ * file is naturally part of VFIO implementation on PowerNV platform.
+ *
+ * Copyright Benjamin Herrenschmidt & 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/kvm_host.h>
+#include <linux/msi.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/vfio.h>
+
+#include <asm/eeh.h>
+#include <asm/eeh_event.h>
+#include <asm/io.h>
+#include <asm/iommu.h>
+#include <asm/opal.h>
+#include <asm/msi_bitmap.h>
+#include <asm/pci-bridge.h>
+#include <asm/ppc-pci.h>
+#include <asm/tce.h>
+#include <asm/uaccess.h>
+
+#include "powernv.h"
+#include "pci.h"
+
+static int powernv_eeh_vfio_map(struct vfio_eeh_info *info)
+{
+ struct pci_bus *bus, *pe_bus;
+ struct pci_dev *pdev;
+ struct eeh_dev *edev;
+ struct eeh_pe *pe;
+ int domain, bus_no, devfn;
+
+ /* Host address */
+ domain = info->map.host_domain;
+ bus_no = (info->map.host_cfg_addr >> 8) & 0xff;
+ devfn = info->map.host_cfg_addr & 0xff;
+
+ /* Find PCI bus */
+ bus = pci_find_bus(domain, bus_no);
+ if (!bus) {
+ pr_warn("%s: PCI bus %04x:%02x not found\n",
+ __func__, domain, bus_no);
+ return -ENODEV;
+ }
+
+ /* Find PCI device */
+ pdev = pci_get_slot(bus, devfn);
+ if (!pdev) {
+ pr_warn("%s: PCI device %04x:%02x:%02x.%01x not found\n",
+ __func__, domain, bus_no,
+ PCI_SLOT(devfn), PCI_FUNC(devfn));
+ return -ENODEV;
+ }
+
+ /* No EEH device - almost impossible */
+ edev = pci_dev_to_eeh_dev(pdev);
+ if (unlikely(!edev)) {
+ pci_dev_put(pdev);
+ pr_warn("%s: No EEH dev for PCI device %s\n",
+ __func__, pci_name(pdev));
+ return -ENODEV;
+ }
+
+ /* Doesn't support PE migration between different PHBs */
+ pe = edev->pe;
+ if (!eeh_pe_passed(pe)) {
+ pe_bus = eeh_pe_bus_get(pe);
+ BUG_ON(!pe_bus);
+
+ /* PE# has format 00BBSS00 */
+ pe->guest_addr.buid = info->map.guest_buid;
+ pe->guest_addr.pe_addr = pe_bus->number << 16;
+ eeh_pe_set_passed(pe, true);
+ } else if (pe->guest_addr.buid != info->map.guest_buid) {
+ pci_dev_put(pdev);
+ pr_warn("%s: Mismatched PHB BUID (0x%llx, 0x%llx)\n",
+ __func__, pe->guest_addr.buid, info->map.guest_buid);
+ return -EINVAL;
+ }
+
+ edev->guest_addr.buid = info->map.guest_buid;
+ edev->guest_addr.config_addr = info->map.guest_cfg_addr;
+ eeh_dev_set_passed(edev, true);
+
+ pr_debug("EEH: Host PCI dev %s to %llx-%02x:%02x.%01x\n",
+ pci_name(pdev), info->map.guest_buid,
+ (info->map.guest_cfg_addr >> 8) & 0xFF,
+ PCI_SLOT(info->map.guest_cfg_addr & 0xFF),
+ PCI_FUNC(info->map.guest_cfg_addr & 0xFF));
+
+ pci_dev_put(pdev);
+ return 0;
+}
+
+static int powernv_eeh_vfio_unmap(struct vfio_eeh_info *info)
+{
+ struct eeh_vfio_pci_addr addr;
+ struct pci_dev *pdev;
+ struct eeh_dev *edev, *tmp;
+ struct eeh_pe *pe;
+ bool passed;
+
+ /* Get EEH device */
+ addr.buid = info->unmap.buid;
+ addr.config_addr = info->unmap.cfg_addr;
+ edev = eeh_vfio_dev_get(&addr);
+ if (!edev) {
+ pr_warn("%s: Cannot find %llx:%02x:%02x.%01x\n",
+ __func__, info->unmap.buid,
+ (info->unmap.cfg_addr >> 8) & 0xFF,
+ PCI_SLOT(info->unmap.cfg_addr & 0xFF),
+ PCI_FUNC(info->unmap.cfg_addr & 0xFF));
+ return -ENODEV;
+ }
+
+ /* Return EEH device */
+ memset(&edev->guest_addr, 0, sizeof(edev->guest_addr));
+ eeh_dev_set_passed(edev, false);
+ pdev = eeh_dev_to_pci_dev(edev);
+ pr_debug("EEH: Host PCI dev %s returned\n",
+ pdev ? pci_name(pdev) : "NULL");
+
+ /* Return PE if no EEH device is owned by guest */
+ pe = edev->pe;
+ passed = false;
+ eeh_pe_for_each_dev(pe, edev, tmp) {
+ pdev = eeh_dev_to_pci_dev(edev);
+ if (pdev && pdev->subordinate)
+ continue;
+
+ if (eeh_dev_passed(edev)) {
+ passed = true;
+ break;
+ }
+ }
+
+ if (!passed) {
+ memset(&pe->guest_addr, 0, sizeof(pe->guest_addr));
+ eeh_pe_set_passed(pe, false);
+ pr_debug("EEH: PHB#%x-PE#%x returned to host\n",
+ pe->phb->global_number, pe->addr);
+ }
+
+ return 0;
+}
+
+static int powernv_eeh_vfio_set_option(struct vfio_eeh_info *info)
+{
+ struct pnv_phb *phb;
+ struct eeh_dev *edev;
+ struct eeh_pe *pe;
+ struct eeh_vfio_pci_addr addr;
+ int opcode = info->option.option;
+ int ret = 0;
+
+ /* Check opcode */
+ if (opcode < EEH_OPT_DISABLE || opcode > EEH_OPT_THAW_DMA) {
+ pr_warn("%s: opcode %d out of range (%d, %d)\n",
+ __func__, opcode, EEH_OPT_DISABLE, EEH_OPT_THAW_DMA);
+ ret = 3;
+ goto out;
+ }
+
+ /* Option "enable" uses PCI config address */
+ if (opcode == EEH_OPT_ENABLE) {
+ addr.buid = info->option.buid;
+ addr.config_addr = (info->option.addr >> 8) & 0xFFFF;
+ edev = eeh_vfio_dev_get(&addr);
+ if (!edev) {
+ pr_warn("%s: Cannot find %llx:%02x:%02x.%01x\n",
+ __func__, addr.buid,
+ (addr.config_addr >> 8) & 0xFF,
+ PCI_SLOT(addr.config_addr & 0xFF),
+ PCI_FUNC(addr.config_addr & 0xFF));
+ ret = 7;
+ goto out;
+ }
+ phb = edev->phb->private_data;
+ } else {
+ addr.buid = info->option.buid;
+ addr.pe_addr = info->option.addr;
+ pe = eeh_vfio_pe_get(&addr);
+ if (!pe) {
+ pr_warn("%s: Cannot find PE %llx:%x\n",
+ __func__, addr.buid, addr.pe_addr);
+ ret = 7;
+ goto out;
+ }
+ phb = pe->phb->private_data;
+ }
+
+ /* Insure that the EEH stuff has been initialized */
+ if (!(phb->flags & PNV_PHB_FLAG_EEH)) {
+ pr_warn("%s: EEH disabled on PHB#%d\n",
+ __func__, phb->hose->global_number);
+ ret = 7;
+ goto out;
+ }
+
+ /*
+ * The EEH functionality has been enabled on all PEs
+ * by default. So just return success. The same situation
+ * would be applied while we disable EEH functionality.
+ * However, the guest isn't expected to disable that
+ * at all.
+ */
+ if (opcode == EEH_OPT_DISABLE ||
+ opcode == EEH_OPT_ENABLE) {
+ ret = 0;
+ goto out;
+ }
+
+ /*
+ * Call into the IODA dependent backend in order
+ * to enable DMA or MMIO for the indicated PE.
+ */
+ if (phb->eeh_ops && phb->eeh_ops->set_option) {
+ if (phb->eeh_ops->set_option(pe, opcode)) {
+ pr_warn("%s: Failure from backend\n",
+ __func__);
+ ret = 1;
+ }
+ } else {
+ pr_warn("%s: Unsupported request\n",
+ __func__);
+ ret = 7;
+ }
+
+out:
+ return ret;
+}
+
+static int powernv_eeh_vfio_get_addr(struct vfio_eeh_info *info)
+{
+ struct pnv_phb *phb;
+ struct eeh_dev *edev;
+ struct eeh_vfio_pci_addr addr;
+ int opcode = info->addr.option;
+ int ret = 0;
+
+ /* Check opcode */
+ if (opcode != 0 && opcode != 1) {
+ pr_warn("%s: opcode %d out of range (0, 1)\n",
+ __func__, opcode);
+ ret = 3;
+ goto out;
+ }
+
+ /* Find EEH device */
+ addr.buid = info->addr.buid;
+ addr.config_addr = (info->addr.cfg_addr >> 8 ) & 0xFFFF;
+ edev = eeh_vfio_dev_get(&addr);
+ if (!edev) {
+ pr_warn("%s: Cannot find %llx:%02x:%02x.%01x\n",
+ __func__, addr.buid,
+ (addr.config_addr >> 8) & 0xFF,
+ PCI_SLOT(addr.config_addr & 0xFF),
+ PCI_FUNC(addr.config_addr & 0xFF));
+ ret = 7;
+ goto out;
+ }
+ phb = edev->phb->private_data;
+
+ /* EEH enabled ? */
+ if (!(phb->flags & PNV_PHB_FLAG_EEH)) {
+ pr_warn("%s: EEH disabled on PHB#%d\n",
+ __func__, phb->hose->global_number);
+ ret = 3;
+ goto out;
+ }
+
+ /* EEH device passed ? */
+ if (!eeh_dev_passed(edev)) {
+ pr_warn("%s: EEH dev %llx:%02x:%02x.%01x owned by host\n",
+ __func__, addr.buid,
+ (addr.config_addr >> 8) & 0xFF,
+ PCI_SLOT(addr.config_addr & 0xFF),
+ PCI_FUNC(addr.config_addr & 0xFF));
+ ret = 3;
+ goto out;
+ }
+
+ /*
+ * Fill result according to opcode. We don't differentiate
+ * PCI bus and device sensitive PE here.
+ */
+ if (opcode == 0)
+ info->addr.ret = edev->pe->guest_addr.pe_addr;
+ else
+ info->addr.ret = 1;
+out:
+ return ret;
+}
+
+static int powernv_eeh_vfio_get_state(struct vfio_eeh_info *info)
+{
+ struct pnv_phb *phb;
+ struct eeh_pe *pe;
+ struct eeh_vfio_pci_addr addr;
+ int result, ret = 0;
+
+ /* Locate the PE */
+ addr.buid = info->state.buid;
+ addr.pe_addr = info->state.pe_addr;
+ pe = eeh_vfio_pe_get(&addr);
+ if (!pe) {
+ pr_warn("%s: Cannot locate %llx:%x\n",
+ __func__, addr.buid, addr.pe_addr);
+ ret = 3;
+ goto out;
+ }
+ phb = pe->phb->private_data;
+
+ /* EEH enabled ? */
+ if (!(phb->flags & PNV_PHB_FLAG_EEH)) {
+ pr_warn("%s: EEH disabled on PHB#%d\n",
+ __func__, phb->hose->global_number);
+ ret = 3;
+ goto out;
+ }
+
+ /* Call to the IOC dependent function */
+ if (phb->eeh_ops && phb->eeh_ops->get_state) {
+ result = phb->eeh_ops->get_state(pe);
+
+ if (!(result & EEH_STATE_RESET_ACTIVE) &&
+ (result & EEH_STATE_DMA_ENABLED) &&
+ (result & EEH_STATE_MMIO_ENABLED))
+ info->state.state = 0;
+ else if (result & EEH_STATE_RESET_ACTIVE)
+ info->state.state = 1;
+ else if (!(result & EEH_STATE_RESET_ACTIVE) &&
+ !(result & EEH_STATE_DMA_ENABLED) &&
+ !(result & EEH_STATE_MMIO_ENABLED))
+ info->state.state = 2;
+ else if (!(result & EEH_STATE_RESET_ACTIVE) &&
+ (result & EEH_STATE_DMA_ENABLED) &&
+ !(result & EEH_STATE_MMIO_ENABLED))
+ info->state.state = 4;
+ else
+ info->state.state = 5;
+
+ ret = 0;
+ } else {
+ pr_warn("%s: Unsupported request\n", __func__);
+ ret = 3;
+ }
+
+out:
+ return ret;
+}
+
+static int powernv_eeh_vfio_pe_reset(struct vfio_eeh_info *info)
+{
+ struct pnv_phb *phb;
+ struct eeh_pe *pe;
+ struct eeh_vfio_pci_addr addr;
+ int opcode = info->reset.option;
+ int ret = 0;
+
+ /* Check opcode */
+ if (opcode != EEH_RESET_DEACTIVATE &&
+ opcode != EEH_RESET_HOT &&
+ opcode != EEH_RESET_FUNDAMENTAL) {
+ pr_warn("%s: Unsupported opcode %d\n",
+ __func__, opcode);
+ ret = 3;
+ goto out;
+ }
+
+ /* Locate the PE */
+ addr.buid = info->reset.buid;
+ addr.pe_addr = info->reset.pe_addr;
+ pe = eeh_vfio_pe_get(&addr);
+ if (!pe) {
+ pr_warn("%s: Cannot locate %llx:%x\n",
+ __func__, addr.buid, addr.pe_addr);
+ ret = 3;
+ goto out;
+ }
+ phb = pe->phb->private_data;
+
+ /* EEH enabled ? */
+ if (!(phb->flags & PNV_PHB_FLAG_EEH)) {
+ pr_warn("%s: EEH disabled on PHB#%d\n",
+ __func__, phb->hose->global_number);
+ ret = 3;
+ goto out;
+ }
+
+ /* Call into the IODA dependent backend to do the reset */
+ if (!phb->eeh_ops ||
+ !phb->eeh_ops->set_option ||
+ !phb->eeh_ops->reset) {
+ pr_warn("%s: Unsupported request\n",
+ __func__);
+ ret = 7;
+ } else {
+ /*
+ * The frozen PE might be caused by the mechanism called
+ * PAPR error injection, which is supposed to be one-shot
+ * without "sticky" bit as being stated by the spec. But
+ * the reality isn't that, at least on P7IOC. So we have
+ * to clear that to avoid recrusive error, which fails the
+ * recovery eventually.
+ */
+ if (opcode == EEH_RESET_DEACTIVATE)
+ opal_pci_reset(phb->opal_id,
+ OPAL_PHB_ERROR,
+ OPAL_ASSERT_RESET);
+
+ if (phb->eeh_ops->reset(pe, opcode)) {
+ pr_warn("%s: Failure from backend\n", __func__);
+ ret = 1;
+ goto out;
+ }
+
+ /*
+ * The PE is still in frozen state and we need clear that.
+ * It's good to clear frozen state after deassert to avoid
+ * messy IO access during reset, which might cause recrusive
+ * frozen PE.
+ */
+ if (opcode == EEH_RESET_DEACTIVATE) {
+ if (phb->eeh_ops->set_option(pe, EEH_OPT_THAW_MMIO) ||
+ phb->eeh_ops->set_option(pe, EEH_OPT_THAW_DMA)) {
+ pr_warn("%s: Cannot clear frozen state\n",
+ __func__);
+ ret = 1;
+ }
+
+ eeh_pe_state_clear(pe, EEH_PE_ISOLATED);
+ }
+ }
+
+out:
+ return ret;
+}
+
+static int powernv_eeh_vfio_pe_config(struct vfio_eeh_info *info)
+{
+ struct pnv_phb *phb;
+ struct eeh_pe *pe;
+ struct eeh_vfio_pci_addr addr;
+ int ret = 0;
+
+ /* Locate the PE */
+ addr.buid = info->config.buid;
+ addr.pe_addr = info->config.pe_addr;
+ pe = eeh_vfio_pe_get(&addr);
+ if (!pe) {
+ pr_warn("%s: Cannot locate %llx:%x\n",
+ __func__, addr.buid, addr.pe_addr);
+ ret = 3;
+ goto out;
+ }
+ phb = pe->phb->private_data;
+
+ /* EEH enabled ? */
+ if (!(phb->flags & PNV_PHB_FLAG_EEH)) {
+ pr_warn("%s: EEH disabled on PHB#%d\n",
+ __func__, phb->hose->global_number);
+ ret = 3;
+ goto out;
+ }
+
+ /*
+ * The access to PCI config space on VFIO device has some
+ * limitations. Part of PCI config space, including BAR
+ * registers are not readable and writable. So the guest
+ * should have stale values for those registers and we have
+ * to restore them in host side.
+ */
+ eeh_pe_restore_bars(pe);
+out:
+ return ret;
+}
+
+void eeh_vfio_release(struct iommu_table *tbl)
+{
+ struct pnv_ioda_pe *pnv_pe = container_of(tbl, struct pnv_ioda_pe,
+ tce32_table);
+ struct pnv_phb *phb = pnv_pe->phb;
+ struct eeh_pe *phb_pe, *pe;
+ struct eeh_dev dev, *edev, *tmp;
+
+ /* Find PHB PE */
+ phb_pe = eeh_phb_pe_get(phb->hose);
+ if (unlikely(!phb_pe)) {
+ pr_warn("%s: Cannot find PHB#%d PE\n",
+ __func__, phb->hose->global_number);
+ return;
+ }
+
+ /* Find PE */
+ memset(&dev, 0, sizeof(struct eeh_dev));
+ dev.phb = phb->hose;
+ dev.pe_config_addr = pnv_pe->pe_number;
+ pe = eeh_pe_get(&dev);
+ if (unlikely(!pe)) {
+ pr_warn("%s: Cannot find PE instance for PHB#%d-PE#%d\n",
+ __func__, phb->hose->global_number,
+ pnv_pe->pe_number);
+ return;
+ }
+
+ /* Release it to host */
+ if (!eeh_pe_passed(pe))
+ return;
+
+ eeh_pe_for_each_dev(pe, edev, tmp) {
+ if (!eeh_dev_passed(edev))
+ continue;
+
+ memset(&edev->guest_addr, 0, sizeof(edev->guest_addr));
+ eeh_dev_set_passed(edev, false);
+ }
+
+ memset(&pe->guest_addr, 0, sizeof(pe->guest_addr));
+ eeh_pe_set_passed(pe, false);
+}
+EXPORT_SYMBOL(eeh_vfio_release);
+
+int eeh_vfio_ioctl(unsigned long arg)
+{
+ struct vfio_eeh_info info;
+ int ret = -EINVAL;
+
+ /* Copy over user argument */
+ if (copy_from_user(&info, (void __user *)arg, sizeof(info))) {
+ pr_warn("%s: Cannot copy user argument 0x%lx\n",
+ __func__, arg);
+ return -EFAULT;
+ }
+
+ /* Sanity check */
+ if (info.argsz != sizeof(info)) {
+ pr_warn("%s: Invalid argument size (%d, %ld)\n",
+ __func__, info.argsz, sizeof(info));
+ return -EINVAL;
+ }
+
+ /* Route according to operation */
+ switch (info.op) {
+ case VFIO_EEH_OP_MAP:
+ ret = powernv_eeh_vfio_map(&info);
+ break;
+ case VFIO_EEH_OP_UNMAP:
+ ret = powernv_eeh_vfio_unmap(&info);
+ break;
+ case VFIO_EEH_OP_SET_OPTION:
+ ret = powernv_eeh_vfio_set_option(&info);
+ break;
+ case VFIO_EEH_OP_GET_ADDR:
+ ret = powernv_eeh_vfio_get_addr(&info);
+ break;
+ case VFIO_EEH_OP_GET_STATE:
+ ret = powernv_eeh_vfio_get_state(&info);
+ break;
+ case VFIO_EEH_OP_PE_RESET:
+ ret = powernv_eeh_vfio_pe_reset(&info);
+ break;
+ case VFIO_EEH_OP_PE_CONFIG:
+ ret = powernv_eeh_vfio_pe_config(&info);
+ break;
+ default:
+ pr_info("%s: Cannot handle op#%d\n",
+ __func__, info.op);
+ }
+
+ /* Copy data back */
+ if (!ret && copy_to_user((void __user *)arg, &info, sizeof(info))) {
+ pr_warn("%s: Cannot copy to user 0x%lx\n",
+ __func__, arg);
+ return -EFAULT;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(eeh_vfio_ioctl);
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index a84788b..c45dece 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -26,6 +26,11 @@
#define DRIVER_AUTHOR "aik at ozlabs.ru"
#define DRIVER_DESC "VFIO IOMMU SPAPR TCE"
+#ifdef CONFIG_VFIO_EEH
+extern void eeh_vfio_release(struct iommu_table *tbl);
+extern int eeh_vfio_ioctl(unsigned long arg);
+#endif
+
static void tce_iommu_detach_group(void *iommu_data,
struct iommu_group *iommu_group);
@@ -283,6 +288,10 @@ static long tce_iommu_ioctl(void *iommu_data,
tce_iommu_disable(container);
mutex_unlock(&container->lock);
return 0;
+#ifdef CONFIG_VFIO_EEH
+ case VFIO_EEH_INFO:
+ return eeh_vfio_ioctl(arg);
+#endif
}
return -ENOTTY;
@@ -342,6 +351,9 @@ static void tce_iommu_detach_group(void *iommu_data,
/* pr_debug("tce_vfio: detaching group #%u from iommu %p\n",
iommu_group_id(iommu_group), iommu_group); */
container->tbl = NULL;
+#ifdef CONFIG_VFIO_EEH
+ eeh_vfio_release(tbl);
+#endif
iommu_release_ownership(tbl);
}
mutex_unlock(&container->lock);
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index cb9023d..1fd1bfb 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -455,6 +455,63 @@ struct vfio_iommu_spapr_tce_info {
#define VFIO_IOMMU_SPAPR_TCE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
+/*
+ * The VFIO EEH info struct provides way to support EEH functionality
+ * for PCI device that is passed from host to guest via VFIO.
+ */
+#define VFIO_EEH_OP_MAP 0
+#define VFIO_EEH_OP_UNMAP 1
+#define VFIO_EEH_OP_SET_OPTION 2
+#define VFIO_EEH_OP_GET_ADDR 3
+#define VFIO_EEH_OP_GET_STATE 4
+#define VFIO_EEH_OP_PE_RESET 5
+#define VFIO_EEH_OP_PE_CONFIG 6
+
+struct vfio_eeh_info {
+ __u32 argsz;
+ __u32 op;
+
+ union {
+ struct vfio_eeh_map {
+ __u32 host_domain;
+ __u16 host_cfg_addr;
+ __u64 guest_buid;
+ __u16 guest_cfg_addr;
+ } map;
+ struct vfio_eeh_unmap {
+ __u64 buid;
+ __u16 cfg_addr;
+ } unmap;
+ struct vfio_eeh_set_option {
+ __u64 buid;
+ __u32 addr;
+ __u32 option;
+ } option;
+ struct vfio_eeh_pe_addr {
+ __u64 buid;
+ __u32 cfg_addr;
+ __u32 option;
+ __u32 ret;
+ } addr;
+ struct vfio_eeh_state {
+ __u64 buid;
+ __u32 pe_addr;
+ __u32 state;
+ } state;
+ struct vfio_eeh_reset {
+ __u64 buid;
+ __u32 pe_addr;
+ __u32 option;
+ } reset;
+ struct vfio_eeh_config {
+ __u64 buid;
+ __u32 pe_addr;
+ } config;
+ };
+};
+
+#define VFIO_EEH_INFO _IO(VFIO_TYPE, VFIO_BASE + 21)
+
/* ***************************************************************** */
#endif /* _UAPIVFIO_H */
--
1.8.3.2
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