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From: "Liu, Yi L" <yi.l.liu@intel.com>
To: alex.williamson@redhat.com, kwankhede@nvidia.com
Cc: kevin.tian@intel.com, baolu.lu@linux.intel.com,
	yi.l.liu@intel.com, yi.y.sun@intel.com, joro@8bytes.org,
	jean-philippe.brucker@arm.com, peterx@redhat.com,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	yamada.masahiro@socionext.com, iommu@lists.linux-foundation.org,
	Liu@vger.kernel.org
Subject: [RFC v3 1/3] vfio_pci: split vfio_pci.c into two source files
Date: Tue, 23 Apr 2019 20:14:38 +0800	[thread overview]
Message-ID: <1556021680-2911-2-git-send-email-yi.l.liu@intel.com> (raw)
In-Reply-To: <1556021680-2911-1-git-send-email-yi.l.liu@intel.com>

This patch splits the non-module specific codes from original
drivers/vfio/pci/vfio_pci.c into a common.c under drivers/vfio/pci.
This is for potential code sharing. e.g. vfio-mdev-pci driver

Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Liu, Yi L <yi.l.liu@intel.com>
---
 drivers/vfio/pci/Makefile           |    2 +-
 drivers/vfio/pci/common.c           | 1511 +++++++++++++++++++++++++++++++++++
 drivers/vfio/pci/vfio_pci.c         | 1476 +---------------------------------
 drivers/vfio/pci/vfio_pci_private.h |   27 +
 4 files changed, 1551 insertions(+), 1465 deletions(-)
 create mode 100644 drivers/vfio/pci/common.c

diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index 9662c06..813f6b3 100644
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -1,5 +1,5 @@
 
-vfio-pci-y := vfio_pci.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
+vfio-pci-y := vfio_pci.o common.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
 vfio-pci-$(CONFIG_VFIO_PCI_IGD) += vfio_pci_igd.o
 vfio-pci-$(CONFIG_VFIO_PCI_NVLINK2) += vfio_pci_nvlink2.o
 
diff --git a/drivers/vfio/pci/common.c b/drivers/vfio/pci/common.c
new file mode 100644
index 0000000..847e2e4
--- /dev/null
+++ b/drivers/vfio/pci/common.c
@@ -0,0 +1,1511 @@
+/*
+ * Copyright © 2019 Intel Corporation.
+ *     Author: Liu, Yi L <yi.l.liu@intel.com>
+ *
+ * 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.
+ *
+ * Derived from original vfio_pci.c:
+ * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
+ *     Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/eventfd.h>
+#include <linux/file.h>
+#include <linux/interrupt.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/vgaarb.h>
+#include <linux/nospec.h>
+
+#include "vfio_pci_private.h"
+
+inline bool vfio_vga_disabled(struct vfio_pci_device *vdev)
+{
+#ifdef CONFIG_VFIO_PCI_VGA
+	return vdev->disable_vga;
+#else
+	return true;
+#endif
+}
+
+/*
+ * Our VGA arbiter participation is limited since we don't know anything
+ * about the device itself.  However, if the device is the only VGA device
+ * downstream of a bridge and VFIO VGA support is disabled, then we can
+ * safely return legacy VGA IO and memory as not decoded since the user
+ * has no way to get to it and routing can be disabled externally at the
+ * bridge.
+ */
+static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga)
+{
+	struct vfio_pci_device *vdev = opaque;
+	struct pci_dev *tmp = NULL, *pdev = vdev->pdev;
+	unsigned char max_busnr;
+	unsigned int decodes;
+
+	if (single_vga || !vfio_vga_disabled(vdev) ||
+	    pci_is_root_bus(pdev->bus))
+		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
+		       VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+
+	max_busnr = pci_bus_max_busnr(pdev->bus);
+	decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+
+	while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
+		if (tmp == pdev ||
+		    pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
+		    pci_is_root_bus(tmp->bus))
+			continue;
+
+		if (tmp->bus->number >= pdev->bus->number &&
+		    tmp->bus->number <= max_busnr) {
+			pci_dev_put(tmp);
+			decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
+			break;
+		}
+	}
+
+	return decodes;
+}
+
+inline bool vfio_pci_is_vga(struct pci_dev *pdev)
+{
+	return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
+}
+
+void vfio_pci_vga_probe(struct vfio_pci_device *vdev)
+{
+	vga_client_register(vdev->pdev, vdev, NULL, vfio_pci_set_vga_decode);
+	vga_set_legacy_decoding(vdev->pdev,
+				vfio_pci_set_vga_decode(vdev, false));
+}
+
+void vfio_pci_vga_remove(struct vfio_pci_device *vdev)
+{
+	vga_client_register(vdev->pdev, NULL, NULL, NULL);
+	vga_set_legacy_decoding(vdev->pdev,
+			VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
+			VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
+}
+
+static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
+{
+	struct resource *res;
+	int bar;
+	struct vfio_pci_dummy_resource *dummy_res;
+
+	INIT_LIST_HEAD(&vdev->dummy_resources_list);
+
+	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
+		res = vdev->pdev->resource + bar;
+
+		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
+			goto no_mmap;
+
+		if (!(res->flags & IORESOURCE_MEM))
+			goto no_mmap;
+
+		/*
+		 * The PCI core shouldn't set up a resource with a
+		 * type but zero size. But there may be bugs that
+		 * cause us to do that.
+		 */
+		if (!resource_size(res))
+			goto no_mmap;
+
+		if (resource_size(res) >= PAGE_SIZE) {
+			vdev->bar_mmap_supported[bar] = true;
+			continue;
+		}
+
+		if (!(res->start & ~PAGE_MASK)) {
+			/*
+			 * Add a dummy resource to reserve the remainder
+			 * of the exclusive page in case that hot-add
+			 * device's bar is assigned into it.
+			 */
+			dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
+			if (dummy_res == NULL)
+				goto no_mmap;
+
+			dummy_res->resource.name = "vfio sub-page reserved";
+			dummy_res->resource.start = res->end + 1;
+			dummy_res->resource.end = res->start + PAGE_SIZE - 1;
+			dummy_res->resource.flags = res->flags;
+			if (request_resource(res->parent,
+						&dummy_res->resource)) {
+				kfree(dummy_res);
+				goto no_mmap;
+			}
+			dummy_res->index = bar;
+			list_add(&dummy_res->res_next,
+					&vdev->dummy_resources_list);
+			vdev->bar_mmap_supported[bar] = true;
+			continue;
+		}
+		/*
+		 * Here we don't handle the case when the BAR is not page
+		 * aligned because we can't expect the BAR will be
+		 * assigned into the same location in a page in guest
+		 * when we passthrough the BAR. And it's hard to access
+		 * this BAR in userspace because we have no way to get
+		 * the BAR's location in a page.
+		 */
+no_mmap:
+		vdev->bar_mmap_supported[bar] = false;
+	}
+}
+
+static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
+
+/*
+ * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
+ * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
+ * If a device implements the former but not the latter we would typically
+ * expect broken_intx_masking be set and require an exclusive interrupt.
+ * However since we do have control of the device's ability to assert INTx,
+ * we can instead pretend that the device does not implement INTx, virtualizing
+ * the pin register to report zero and maintaining DisINTx set on the host.
+ */
+static bool vfio_pci_nointx(struct pci_dev *pdev)
+{
+	switch (pdev->vendor) {
+	case PCI_VENDOR_ID_INTEL:
+		switch (pdev->device) {
+		/* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
+		case 0x1572:
+		case 0x1574:
+		case 0x1580 ... 0x1581:
+		case 0x1583 ... 0x158b:
+		case 0x37d0 ... 0x37d2:
+			return true;
+		default:
+			return false;
+		}
+	}
+
+	return false;
+}
+
+void vfio_pci_probe_power_state(struct vfio_pci_device *vdev)
+{
+	struct pci_dev *pdev = vdev->pdev;
+	u16 pmcsr;
+
+	if (!pdev->pm_cap)
+		return;
+
+	pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr);
+
+	vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
+}
+
+/*
+ * pci_set_power_state() wrapper handling devices which perform a soft reset on
+ * D3->D0 transition.  Save state prior to D0/1/2->D3, stash it on the vdev,
+ * restore when returned to D0.  Saved separately from pci_saved_state for use
+ * by PM capability emulation and separately from pci_dev internal saved state
+ * to avoid it being overwritten and consumed around other resets.
+ */
+int vfio_pci_set_power_state(struct vfio_pci_device *vdev, pci_power_t state)
+{
+	struct pci_dev *pdev = vdev->pdev;
+	bool needs_restore = false, needs_save = false;
+	int ret;
+
+	if (vdev->needs_pm_restore) {
+		if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) {
+			pci_save_state(pdev);
+			needs_save = true;
+		}
+
+		if (pdev->current_state >= PCI_D3hot && state <= PCI_D0)
+			needs_restore = true;
+	}
+
+	ret = pci_set_power_state(pdev, state);
+
+	if (!ret) {
+		/* D3 might be unsupported via quirk, skip unless in D3 */
+		if (needs_save && pdev->current_state >= PCI_D3hot) {
+			vdev->pm_save = pci_store_saved_state(pdev);
+		} else if (needs_restore) {
+			pci_load_and_free_saved_state(pdev, &vdev->pm_save);
+			pci_restore_state(pdev);
+		}
+	}
+
+	return ret;
+}
+
+void vfio_pci_probe_idle_d3(struct vfio_pci_device *vdev)
+{
+
+	/*
+	 * pci-core sets the device power state to an unknown value at
+	 * bootup and after being removed from a driver.  The only
+	 * transition it allows from this unknown state is to D0, which
+	 * typically happens when a driver calls pci_enable_device().
+	 * We're not ready to enable the device yet, but we do want to
+	 * be able to get to D3.  Therefore first do a D0 transition
+	 * before going to D3.
+	 */
+	vfio_pci_set_power_state(vdev, PCI_D0);
+	vfio_pci_set_power_state(vdev, PCI_D3hot);
+}
+
+int vfio_pci_enable(struct vfio_pci_device *vdev)
+{
+	struct pci_dev *pdev = vdev->pdev;
+	int ret;
+	u16 cmd;
+	u8 msix_pos;
+
+	vfio_pci_set_power_state(vdev, PCI_D0);
+
+	/* Don't allow our initial saved state to include busmaster */
+	pci_clear_master(pdev);
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	/* If reset fails because of the device lock, fail this path entirely */
+	ret = pci_try_reset_function(pdev);
+	if (ret == -EAGAIN) {
+		pci_disable_device(pdev);
+		return ret;
+	}
+
+	vdev->reset_works = !ret;
+	pci_save_state(pdev);
+	vdev->pci_saved_state = pci_store_saved_state(pdev);
+	if (!vdev->pci_saved_state)
+		pr_debug("%s: Couldn't store %s saved state\n",
+			 __func__, dev_name(&pdev->dev));
+
+	if (likely(!vdev->nointxmask)) {
+		if (vfio_pci_nointx(pdev)) {
+			dev_info(&pdev->dev, "Masking broken INTx support\n");
+			vdev->nointx = true;
+			pci_intx(pdev, 0);
+		} else
+			vdev->pci_2_3 = pci_intx_mask_supported(pdev);
+	}
+
+	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+	if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
+		cmd &= ~PCI_COMMAND_INTX_DISABLE;
+		pci_write_config_word(pdev, PCI_COMMAND, cmd);
+	}
+
+	ret = vfio_config_init(vdev);
+	if (ret) {
+		kfree(vdev->pci_saved_state);
+		vdev->pci_saved_state = NULL;
+		pci_disable_device(pdev);
+		return ret;
+	}
+
+	msix_pos = pdev->msix_cap;
+	if (msix_pos) {
+		u16 flags;
+		u32 table;
+
+		pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
+		pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
+
+		vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
+		vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
+		vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
+	} else
+		vdev->msix_bar = 0xFF;
+
+	if (!vfio_vga_disabled(vdev) && vfio_pci_is_vga(pdev))
+		vdev->has_vga = true;
+
+
+	if (vfio_pci_is_vga(pdev) &&
+	    pdev->vendor == PCI_VENDOR_ID_INTEL &&
+	    IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
+		ret = vfio_pci_igd_init(vdev);
+		if (ret) {
+			dev_warn(&vdev->pdev->dev,
+				 "Failed to setup Intel IGD regions\n");
+			goto disable_exit;
+		}
+	}
+
+	if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
+	    IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) {
+		ret = vfio_pci_nvdia_v100_nvlink2_init(vdev);
+		if (ret && ret != -ENODEV) {
+			dev_warn(&vdev->pdev->dev,
+				 "Failed to setup NVIDIA NV2 RAM region\n");
+			goto disable_exit;
+		}
+	}
+
+	if (pdev->vendor == PCI_VENDOR_ID_IBM &&
+	    IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) {
+		ret = vfio_pci_ibm_npu2_init(vdev);
+		if (ret && ret != -ENODEV) {
+			dev_warn(&vdev->pdev->dev,
+					"Failed to setup NVIDIA NV2 ATSD region\n");
+			goto disable_exit;
+		}
+	}
+
+	vfio_pci_probe_mmaps(vdev);
+
+	return 0;
+
+disable_exit:
+	vfio_pci_disable(vdev);
+	return ret;
+}
+
+void vfio_pci_disable(struct vfio_pci_device *vdev)
+{
+	struct pci_dev *pdev = vdev->pdev;
+	struct vfio_pci_dummy_resource *dummy_res, *tmp;
+	struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
+	int i, bar;
+
+	/* Stop the device from further DMA */
+	pci_clear_master(pdev);
+
+	vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
+				VFIO_IRQ_SET_ACTION_TRIGGER,
+				vdev->irq_type, 0, 0, NULL);
+
+	/* Device closed, don't need mutex here */
+	list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
+				 &vdev->ioeventfds_list, next) {
+		vfio_virqfd_disable(&ioeventfd->virqfd);
+		list_del(&ioeventfd->next);
+		kfree(ioeventfd);
+	}
+	vdev->ioeventfds_nr = 0;
+
+	vdev->virq_disabled = false;
+
+	for (i = 0; i < vdev->num_regions; i++)
+		vdev->region[i].ops->release(vdev, &vdev->region[i]);
+
+	vdev->num_regions = 0;
+	kfree(vdev->region);
+	vdev->region = NULL; /* don't krealloc a freed pointer */
+
+	vfio_config_free(vdev);
+
+	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
+		if (!vdev->barmap[bar])
+			continue;
+		pci_iounmap(pdev, vdev->barmap[bar]);
+		pci_release_selected_regions(pdev, 1 << bar);
+		vdev->barmap[bar] = NULL;
+	}
+
+	list_for_each_entry_safe(dummy_res, tmp,
+				 &vdev->dummy_resources_list, res_next) {
+		list_del(&dummy_res->res_next);
+		release_resource(&dummy_res->resource);
+		kfree(dummy_res);
+	}
+
+	vdev->needs_reset = true;
+
+	/*
+	 * If we have saved state, restore it.  If we can reset the device,
+	 * even better.  Resetting with current state seems better than
+	 * nothing, but saving and restoring current state without reset
+	 * is just busy work.
+	 */
+	if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
+		pr_info("%s: Couldn't reload %s saved state\n",
+			__func__, dev_name(&pdev->dev));
+
+		if (!vdev->reset_works)
+			goto out;
+
+		pci_save_state(pdev);
+	}
+
+	/*
+	 * Disable INTx and MSI, presumably to avoid spurious interrupts
+	 * during reset.  Stolen from pci_reset_function()
+	 */
+	pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
+
+	/*
+	 * Try to reset the device.  The success of this is dependent on
+	 * being able to lock the device, which is not always possible.
+	 */
+	if (vdev->reset_works && !pci_try_reset_function(pdev))
+		vdev->needs_reset = false;
+
+	pci_restore_state(pdev);
+out:
+	pci_disable_device(pdev);
+
+	vfio_pci_try_bus_reset(vdev);
+
+	if (!vdev->disable_idle_d3)
+		vfio_pci_set_power_state(vdev, PCI_D3hot);
+}
+
+static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
+{
+	if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
+		u8 pin;
+
+		if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
+		    vdev->nointx || vdev->pdev->is_virtfn)
+			return 0;
+
+		pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
+
+		return pin ? 1 : 0;
+	} else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
+		u8 pos;
+		u16 flags;
+
+		pos = vdev->pdev->msi_cap;
+		if (pos) {
+			pci_read_config_word(vdev->pdev,
+					     pos + PCI_MSI_FLAGS, &flags);
+			return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
+		}
+	} else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
+		u8 pos;
+		u16 flags;
+
+		pos = vdev->pdev->msix_cap;
+		if (pos) {
+			pci_read_config_word(vdev->pdev,
+					     pos + PCI_MSIX_FLAGS, &flags);
+
+			return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
+		}
+	} else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
+		if (pci_is_pcie(vdev->pdev))
+			return 1;
+	} else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
+		return 1;
+	}
+
+	return 0;
+}
+
+static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
+{
+	(*(int *)data)++;
+	return 0;
+}
+
+struct vfio_pci_fill_info {
+	int max;
+	int cur;
+	struct vfio_pci_dependent_device *devices;
+};
+
+static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
+{
+	struct vfio_pci_fill_info *fill = data;
+	struct iommu_group *iommu_group;
+
+	if (fill->cur == fill->max)
+		return -EAGAIN; /* Something changed, try again */
+
+	iommu_group = iommu_group_get(&pdev->dev);
+	if (!iommu_group)
+		return -EPERM; /* Cannot reset non-isolated devices */
+
+	fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
+	fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
+	fill->devices[fill->cur].bus = pdev->bus->number;
+	fill->devices[fill->cur].devfn = pdev->devfn;
+	fill->cur++;
+	iommu_group_put(iommu_group);
+	return 0;
+}
+
+struct vfio_pci_group_entry {
+	struct vfio_group *group;
+	int id;
+};
+
+struct vfio_pci_group_info {
+	int count;
+	struct vfio_pci_group_entry *groups;
+};
+
+static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
+{
+	struct vfio_pci_group_info *info = data;
+	struct iommu_group *group;
+	int id, i;
+
+	group = iommu_group_get(&pdev->dev);
+	if (!group)
+		return -EPERM;
+
+	id = iommu_group_id(group);
+
+	for (i = 0; i < info->count; i++)
+		if (info->groups[i].id == id)
+			break;
+
+	iommu_group_put(group);
+
+	return (i == info->count) ? -EINVAL : 0;
+}
+
+static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
+{
+	for (; pdev; pdev = pdev->bus->self)
+		if (pdev->bus == slot->bus)
+			return (pdev->slot == slot);
+	return false;
+}
+
+struct vfio_pci_walk_info {
+	int (*fn)(struct pci_dev *pdev, void *data);
+	void *data;
+	struct pci_dev *pdev;
+	bool slot;
+	int ret;
+};
+
+static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
+{
+	struct vfio_pci_walk_info *walk = data;
+
+	if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
+		walk->ret = walk->fn(pdev, walk->data);
+
+	return walk->ret;
+}
+
+static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
+					 int (*fn)(struct pci_dev *pdev,
+						   void *data), void *data,
+					 bool slot)
+{
+	struct vfio_pci_walk_info walk = {
+		.fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
+	};
+
+	pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
+
+	return walk.ret;
+}
+
+static int msix_mmappable_cap(struct vfio_pci_device *vdev,
+			      struct vfio_info_cap *caps)
+{
+	struct vfio_info_cap_header header = {
+		.id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE,
+		.version = 1
+	};
+
+	return vfio_info_add_capability(caps, &header, sizeof(header));
+}
+
+int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
+				 unsigned int type, unsigned int subtype,
+				 const struct vfio_pci_regops *ops,
+				 size_t size, u32 flags, void *data)
+{
+	struct vfio_pci_region *region;
+
+	region = krealloc(vdev->region,
+			  (vdev->num_regions + 1) * sizeof(*region),
+			  GFP_KERNEL);
+	if (!region)
+		return -ENOMEM;
+
+	vdev->region = region;
+	vdev->region[vdev->num_regions].type = type;
+	vdev->region[vdev->num_regions].subtype = subtype;
+	vdev->region[vdev->num_regions].ops = ops;
+	vdev->region[vdev->num_regions].size = size;
+	vdev->region[vdev->num_regions].flags = flags;
+	vdev->region[vdev->num_regions].data = data;
+
+	vdev->num_regions++;
+
+	return 0;
+}
+
+long vfio_pci_ioctl(void *device_data,
+		   unsigned int cmd, unsigned long arg)
+{
+	struct vfio_pci_device *vdev = device_data;
+	unsigned long minsz;
+
+	if (cmd == VFIO_DEVICE_GET_INFO) {
+		struct vfio_device_info info;
+
+		minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+		if (copy_from_user(&info, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (info.argsz < minsz)
+			return -EINVAL;
+
+		info.flags = VFIO_DEVICE_FLAGS_PCI;
+
+		if (vdev->reset_works)
+			info.flags |= VFIO_DEVICE_FLAGS_RESET;
+
+		info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
+		info.num_irqs = VFIO_PCI_NUM_IRQS;
+
+		return copy_to_user((void __user *)arg, &info, minsz) ?
+			-EFAULT : 0;
+
+	} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
+		struct pci_dev *pdev = vdev->pdev;
+		struct vfio_region_info info;
+		struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
+		int i, ret;
+
+		minsz = offsetofend(struct vfio_region_info, offset);
+
+		if (copy_from_user(&info, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (info.argsz < minsz)
+			return -EINVAL;
+
+		switch (info.index) {
+		case VFIO_PCI_CONFIG_REGION_INDEX:
+			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+			info.size = pdev->cfg_size;
+			info.flags = VFIO_REGION_INFO_FLAG_READ |
+				     VFIO_REGION_INFO_FLAG_WRITE;
+			break;
+		case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
+			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+			info.size = pci_resource_len(pdev, info.index);
+			if (!info.size) {
+				info.flags = 0;
+				break;
+			}
+
+			info.flags = VFIO_REGION_INFO_FLAG_READ |
+				     VFIO_REGION_INFO_FLAG_WRITE;
+			if (vdev->bar_mmap_supported[info.index]) {
+				info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
+				if (info.index == vdev->msix_bar) {
+					ret = msix_mmappable_cap(vdev, &caps);
+					if (ret)
+						return ret;
+				}
+			}
+
+			break;
+		case VFIO_PCI_ROM_REGION_INDEX:
+		{
+			void __iomem *io;
+			size_t size;
+			u16 orig_cmd;
+
+			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+			info.flags = 0;
+
+			/* Report the BAR size, not the ROM size */
+			info.size = pci_resource_len(pdev, info.index);
+			if (!info.size) {
+				/* Shadow ROMs appear as PCI option ROMs */
+				if (pdev->resource[PCI_ROM_RESOURCE].flags &
+							IORESOURCE_ROM_SHADOW)
+					info.size = 0x20000;
+				else
+					break;
+			}
+
+			/*
+			 * Is it really there?  Enable memory decode for
+			 * implicit access in pci_map_rom().
+			 */
+			pci_read_config_word(pdev, PCI_COMMAND, &orig_cmd);
+			pci_write_config_word(pdev, PCI_COMMAND,
+					      orig_cmd | PCI_COMMAND_MEMORY);
+
+			io = pci_map_rom(pdev, &size);
+			if (io) {
+				info.flags = VFIO_REGION_INFO_FLAG_READ;
+				pci_unmap_rom(pdev, io);
+			} else {
+				info.size = 0;
+			}
+
+			pci_write_config_word(pdev, PCI_COMMAND, orig_cmd);
+			break;
+		}
+		case VFIO_PCI_VGA_REGION_INDEX:
+			if (!vdev->has_vga)
+				return -EINVAL;
+
+			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+			info.size = 0xc0000;
+			info.flags = VFIO_REGION_INFO_FLAG_READ |
+				     VFIO_REGION_INFO_FLAG_WRITE;
+
+			break;
+		default:
+		{
+			struct vfio_region_info_cap_type cap_type = {
+					.header.id = VFIO_REGION_INFO_CAP_TYPE,
+					.header.version = 1 };
+
+			if (info.index >=
+			    VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+				return -EINVAL;
+			info.index = array_index_nospec(info.index,
+							VFIO_PCI_NUM_REGIONS +
+							vdev->num_regions);
+
+			i = info.index - VFIO_PCI_NUM_REGIONS;
+
+			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
+			info.size = vdev->region[i].size;
+			info.flags = vdev->region[i].flags;
+
+			cap_type.type = vdev->region[i].type;
+			cap_type.subtype = vdev->region[i].subtype;
+
+			ret = vfio_info_add_capability(&caps, &cap_type.header,
+						       sizeof(cap_type));
+			if (ret)
+				return ret;
+
+			if (vdev->region[i].ops->add_capability) {
+				ret = vdev->region[i].ops->add_capability(vdev,
+						&vdev->region[i], &caps);
+				if (ret)
+					return ret;
+			}
+		}
+		}
+
+		if (caps.size) {
+			info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
+			if (info.argsz < sizeof(info) + caps.size) {
+				info.argsz = sizeof(info) + caps.size;
+				info.cap_offset = 0;
+			} else {
+				vfio_info_cap_shift(&caps, sizeof(info));
+				if (copy_to_user((void __user *)arg +
+						  sizeof(info), caps.buf,
+						  caps.size)) {
+					kfree(caps.buf);
+					return -EFAULT;
+				}
+				info.cap_offset = sizeof(info);
+			}
+
+			kfree(caps.buf);
+		}
+
+		return copy_to_user((void __user *)arg, &info, minsz) ?
+			-EFAULT : 0;
+
+	} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
+		struct vfio_irq_info info;
+
+		minsz = offsetofend(struct vfio_irq_info, count);
+
+		if (copy_from_user(&info, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
+			return -EINVAL;
+
+		switch (info.index) {
+		case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
+		case VFIO_PCI_REQ_IRQ_INDEX:
+			break;
+		case VFIO_PCI_ERR_IRQ_INDEX:
+			if (pci_is_pcie(vdev->pdev))
+				break;
+		/* fall through */
+		default:
+			return -EINVAL;
+		}
+
+		info.flags = VFIO_IRQ_INFO_EVENTFD;
+
+		info.count = vfio_pci_get_irq_count(vdev, info.index);
+
+		if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
+			info.flags |= (VFIO_IRQ_INFO_MASKABLE |
+				       VFIO_IRQ_INFO_AUTOMASKED);
+		else
+			info.flags |= VFIO_IRQ_INFO_NORESIZE;
+
+		return copy_to_user((void __user *)arg, &info, minsz) ?
+			-EFAULT : 0;
+
+	} else if (cmd == VFIO_DEVICE_SET_IRQS) {
+		struct vfio_irq_set hdr;
+		u8 *data = NULL;
+		int max, ret = 0;
+		size_t data_size = 0;
+
+		minsz = offsetofend(struct vfio_irq_set, count);
+
+		if (copy_from_user(&hdr, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		max = vfio_pci_get_irq_count(vdev, hdr.index);
+
+		ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
+						 VFIO_PCI_NUM_IRQS, &data_size);
+		if (ret)
+			return ret;
+
+		if (data_size) {
+			data = memdup_user((void __user *)(arg + minsz),
+					    data_size);
+			if (IS_ERR(data))
+				return PTR_ERR(data);
+		}
+
+		mutex_lock(&vdev->igate);
+
+		ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
+					      hdr.start, hdr.count, data);
+
+		mutex_unlock(&vdev->igate);
+		kfree(data);
+
+		return ret;
+
+	} else if (cmd == VFIO_DEVICE_RESET) {
+		return vdev->reset_works ?
+			pci_try_reset_function(vdev->pdev) : -EINVAL;
+
+	} else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
+		struct vfio_pci_hot_reset_info hdr;
+		struct vfio_pci_fill_info fill = { 0 };
+		struct vfio_pci_dependent_device *devices = NULL;
+		bool slot = false;
+		int ret = 0;
+
+		minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
+
+		if (copy_from_user(&hdr, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (hdr.argsz < minsz)
+			return -EINVAL;
+
+		hdr.flags = 0;
+
+		/* Can we do a slot or bus reset or neither? */
+		if (!pci_probe_reset_slot(vdev->pdev->slot))
+			slot = true;
+		else if (pci_probe_reset_bus(vdev->pdev->bus))
+			return -ENODEV;
+
+		/* How many devices are affected? */
+		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+						    vfio_pci_count_devs,
+						    &fill.max, slot);
+		if (ret)
+			return ret;
+
+		WARN_ON(!fill.max); /* Should always be at least one */
+
+		/*
+		 * If there's enough space, fill it now, otherwise return
+		 * -ENOSPC and the number of devices affected.
+		 */
+		if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
+			ret = -ENOSPC;
+			hdr.count = fill.max;
+			goto reset_info_exit;
+		}
+
+		devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
+		if (!devices)
+			return -ENOMEM;
+
+		fill.devices = devices;
+
+		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+						    vfio_pci_fill_devs,
+						    &fill, slot);
+
+		/*
+		 * If a device was removed between counting and filling,
+		 * we may come up short of fill.max.  If a device was
+		 * added, we'll have a return of -EAGAIN above.
+		 */
+		if (!ret)
+			hdr.count = fill.cur;
+
+reset_info_exit:
+		if (copy_to_user((void __user *)arg, &hdr, minsz))
+			ret = -EFAULT;
+
+		if (!ret) {
+			if (copy_to_user((void __user *)(arg + minsz), devices,
+					 hdr.count * sizeof(*devices)))
+				ret = -EFAULT;
+		}
+
+		kfree(devices);
+		return ret;
+
+	} else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
+		struct vfio_pci_hot_reset hdr;
+		int32_t *group_fds;
+		struct vfio_pci_group_entry *groups;
+		struct vfio_pci_group_info info;
+		bool slot = false;
+		int i, count = 0, ret = 0;
+
+		minsz = offsetofend(struct vfio_pci_hot_reset, count);
+
+		if (copy_from_user(&hdr, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (hdr.argsz < minsz || hdr.flags)
+			return -EINVAL;
+
+		/* Can we do a slot or bus reset or neither? */
+		if (!pci_probe_reset_slot(vdev->pdev->slot))
+			slot = true;
+		else if (pci_probe_reset_bus(vdev->pdev->bus))
+			return -ENODEV;
+
+		/*
+		 * We can't let userspace give us an arbitrarily large
+		 * buffer to copy, so verify how many we think there
+		 * could be.  Note groups can have multiple devices so
+		 * one group per device is the max.
+		 */
+		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+						    vfio_pci_count_devs,
+						    &count, slot);
+		if (ret)
+			return ret;
+
+		/* Somewhere between 1 and count is OK */
+		if (!hdr.count || hdr.count > count)
+			return -EINVAL;
+
+		group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
+		groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
+		if (!group_fds || !groups) {
+			kfree(group_fds);
+			kfree(groups);
+			return -ENOMEM;
+		}
+
+		if (copy_from_user(group_fds, (void __user *)(arg + minsz),
+				   hdr.count * sizeof(*group_fds))) {
+			kfree(group_fds);
+			kfree(groups);
+			return -EFAULT;
+		}
+
+		/*
+		 * For each group_fd, get the group through the vfio external
+		 * user interface and store the group and iommu ID.  This
+		 * ensures the group is held across the reset.
+		 */
+		for (i = 0; i < hdr.count; i++) {
+			struct vfio_group *group;
+			struct fd f = fdget(group_fds[i]);
+
+			if (!f.file) {
+				ret = -EBADF;
+				break;
+			}
+
+			group = vfio_group_get_external_user(f.file);
+			fdput(f);
+			if (IS_ERR(group)) {
+				ret = PTR_ERR(group);
+				break;
+			}
+
+			groups[i].group = group;
+			groups[i].id = vfio_external_user_iommu_id(group);
+		}
+
+		kfree(group_fds);
+
+		/* release reference to groups on error */
+		if (ret)
+			goto hot_reset_release;
+
+		info.count = hdr.count;
+		info.groups = groups;
+
+		/*
+		 * Test whether all the affected devices are contained
+		 * by the set of groups provided by the user.
+		 */
+		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+						    vfio_pci_validate_devs,
+						    &info, slot);
+		if (!ret)
+			/* User has access, do the reset */
+			ret = pci_reset_bus(vdev->pdev);
+
+hot_reset_release:
+		for (i--; i >= 0; i--)
+			vfio_group_put_external_user(groups[i].group);
+
+		kfree(groups);
+		return ret;
+	} else if (cmd == VFIO_DEVICE_IOEVENTFD) {
+		struct vfio_device_ioeventfd ioeventfd;
+		int count;
+
+		minsz = offsetofend(struct vfio_device_ioeventfd, fd);
+
+		if (copy_from_user(&ioeventfd, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (ioeventfd.argsz < minsz)
+			return -EINVAL;
+
+		if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK)
+			return -EINVAL;
+
+		count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK;
+
+		if (hweight8(count) != 1 || ioeventfd.fd < -1)
+			return -EINVAL;
+
+		return vfio_pci_ioeventfd(vdev, ioeventfd.offset,
+					  ioeventfd.data, count, ioeventfd.fd);
+	}
+
+	return -ENOTTY;
+}
+
+static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
+			   size_t count, loff_t *ppos, bool iswrite)
+{
+	unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
+	struct vfio_pci_device *vdev = device_data;
+
+	if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+		return -EINVAL;
+
+	switch (index) {
+	case VFIO_PCI_CONFIG_REGION_INDEX:
+		return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
+
+	case VFIO_PCI_ROM_REGION_INDEX:
+		if (iswrite)
+			return -EINVAL;
+		return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
+
+	case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
+		return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
+
+	case VFIO_PCI_VGA_REGION_INDEX:
+		return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
+	default:
+		index -= VFIO_PCI_NUM_REGIONS;
+		return vdev->region[index].ops->rw(vdev, buf,
+						   count, ppos, iswrite);
+	}
+
+	return -EINVAL;
+}
+
+ssize_t vfio_pci_read(void *device_data, char __user *buf,
+			     size_t count, loff_t *ppos)
+{
+	if (!count)
+		return 0;
+
+	return vfio_pci_rw(device_data, buf, count, ppos, false);
+}
+
+ssize_t vfio_pci_write(void *device_data, const char __user *buf,
+			      size_t count, loff_t *ppos)
+{
+	if (!count)
+		return 0;
+
+	return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
+}
+
+int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
+{
+	struct vfio_pci_device *vdev = device_data;
+	struct pci_dev *pdev = vdev->pdev;
+	unsigned int index;
+	u64 phys_len, req_len, pgoff, req_start;
+	int ret;
+
+	index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
+
+	if (vma->vm_end < vma->vm_start)
+		return -EINVAL;
+	if ((vma->vm_flags & VM_SHARED) == 0)
+		return -EINVAL;
+	if (index >= VFIO_PCI_NUM_REGIONS) {
+		int regnum = index - VFIO_PCI_NUM_REGIONS;
+		struct vfio_pci_region *region = vdev->region + regnum;
+
+		if (region && region->ops && region->ops->mmap &&
+		    (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
+			return region->ops->mmap(vdev, region, vma);
+		return -EINVAL;
+	}
+	if (index >= VFIO_PCI_ROM_REGION_INDEX)
+		return -EINVAL;
+	if (!vdev->bar_mmap_supported[index])
+		return -EINVAL;
+
+	phys_len = PAGE_ALIGN(pci_resource_len(pdev, index));
+	req_len = vma->vm_end - vma->vm_start;
+	pgoff = vma->vm_pgoff &
+		((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
+	req_start = pgoff << PAGE_SHIFT;
+
+	if (req_start + req_len > phys_len)
+		return -EINVAL;
+
+	/*
+	 * Even though we don't make use of the barmap for the mmap,
+	 * we need to request the region and the barmap tracks that.
+	 */
+	if (!vdev->barmap[index]) {
+		ret = pci_request_selected_regions(pdev,
+						   1 << index,
+						   pci_dev_driver(pdev)->name);
+		if (ret)
+			return ret;
+
+		vdev->barmap[index] = pci_iomap(pdev, index, 0);
+		if (!vdev->barmap[index]) {
+			pci_release_selected_regions(pdev, 1 << index);
+			return -ENOMEM;
+		}
+	}
+
+	vma->vm_private_data = vdev;
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+	vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
+
+	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+			       req_len, vma->vm_page_prot);
+}
+
+void vfio_pci_request(void *device_data, unsigned int count)
+{
+	struct vfio_pci_device *vdev = device_data;
+
+	mutex_lock(&vdev->igate);
+
+	if (vdev->req_trigger) {
+		if (!(count % 10))
+			dev_notice_ratelimited(&vdev->pdev->dev,
+				"Relaying device request to user (#%u)\n",
+				count);
+		eventfd_signal(vdev->req_trigger, 1);
+	} else if (count == 0) {
+		dev_warn(&vdev->pdev->dev,
+			"No device request channel registered, blocked until released by user\n");
+	}
+
+	mutex_unlock(&vdev->igate);
+}
+
+static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
+						  pci_channel_state_t state)
+{
+	struct vfio_pci_device *vdev;
+	struct vfio_device *device;
+
+	device = vfio_device_get_from_dev(&pdev->dev);
+	if (device == NULL)
+		return PCI_ERS_RESULT_DISCONNECT;
+
+	vdev = vfio_device_data(device);
+	if (vdev == NULL) {
+		vfio_device_put(device);
+		return PCI_ERS_RESULT_DISCONNECT;
+	}
+
+	mutex_lock(&vdev->igate);
+
+	if (vdev->err_trigger)
+		eventfd_signal(vdev->err_trigger, 1);
+
+	mutex_unlock(&vdev->igate);
+
+	vfio_device_put(device);
+
+	return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
+const struct pci_error_handlers vfio_err_handlers = {
+	.error_detected = vfio_pci_aer_err_detected,
+};
+
+static DEFINE_MUTEX(reflck_lock);
+
+static struct vfio_pci_reflck *vfio_pci_reflck_alloc(void)
+{
+	struct vfio_pci_reflck *reflck;
+
+	reflck = kzalloc(sizeof(*reflck), GFP_KERNEL);
+	if (!reflck)
+		return ERR_PTR(-ENOMEM);
+
+	kref_init(&reflck->kref);
+	mutex_init(&reflck->lock);
+
+	return reflck;
+}
+
+static void vfio_pci_reflck_get(struct vfio_pci_reflck *reflck)
+{
+	kref_get(&reflck->kref);
+}
+
+static int vfio_pci_reflck_find(struct pci_dev *pdev, void *data)
+{
+	struct vfio_pci_device *vdev = data;
+	struct vfio_pci_reflck **preflck = &vdev->reflck;
+	struct vfio_device *device;
+	struct vfio_pci_device *tmp;
+
+	device = vfio_device_get_from_dev(&pdev->dev);
+	if (!device)
+		return 0;
+
+	if (pci_dev_driver(pdev) != pci_dev_driver(vdev->pdev)) {
+		vfio_device_put(device);
+		return 0;
+	}
+
+	tmp = vfio_device_data(device);
+
+	if (tmp->reflck) {
+		vfio_pci_reflck_get(tmp->reflck);
+		*preflck = tmp->reflck;
+		vfio_device_put(device);
+		return 1;
+	}
+
+	vfio_device_put(device);
+	return 0;
+}
+
+int vfio_pci_reflck_attach(struct vfio_pci_device *vdev)
+{
+	bool slot = !pci_probe_reset_slot(vdev->pdev->slot);
+
+	mutex_lock(&reflck_lock);
+
+	if (pci_is_root_bus(vdev->pdev->bus) ||
+	    vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_reflck_find,
+					  vdev, slot) <= 0)
+		vdev->reflck = vfio_pci_reflck_alloc();
+
+	mutex_unlock(&reflck_lock);
+
+	return PTR_ERR_OR_ZERO(vdev->reflck);
+}
+
+static void vfio_pci_reflck_release(struct kref *kref)
+{
+	struct vfio_pci_reflck *reflck = container_of(kref,
+						      struct vfio_pci_reflck,
+						      kref);
+
+	kfree(reflck);
+	mutex_unlock(&reflck_lock);
+}
+
+void vfio_pci_reflck_put(struct vfio_pci_reflck *reflck)
+{
+	kref_put_mutex(&reflck->kref, vfio_pci_reflck_release, &reflck_lock);
+}
+
+struct vfio_devices {
+	struct vfio_device **devices;
+	struct vfio_pci_device *vdev;
+	int cur_index;
+	int max_index;
+};
+
+static int vfio_pci_get_unused_devs(struct pci_dev *pdev, void *data)
+{
+	struct vfio_devices *devs = data;
+	struct vfio_device *device;
+	struct vfio_pci_device *tmp;
+
+	if (devs->cur_index == devs->max_index)
+		return -ENOSPC;
+
+	device = vfio_device_get_from_dev(&pdev->dev);
+	if (!device)
+		return -EINVAL;
+
+	if (pci_dev_driver(pdev) != pci_dev_driver(devs->vdev->pdev)) {
+		vfio_device_put(device);
+		return -EBUSY;
+	}
+
+	tmp = vfio_device_data(device);
+
+	/* Fault if the device is not unused */
+	if (tmp->refcnt) {
+		vfio_device_put(device);
+		return -EBUSY;
+	}
+
+	devs->devices[devs->cur_index++] = device;
+	return 0;
+}
+
+/*
+ * If a bus or slot reset is available for the provided device and:
+ *  - All of the devices affected by that bus or slot reset are unused
+ *    (!refcnt)
+ *  - At least one of the affected devices is marked dirty via
+ *    needs_reset (such as by lack of FLR support)
+ * Then attempt to perform that bus or slot reset.  Callers are required
+ * to hold vdev->reflck->lock, protecting the bus/slot reset group from
+ * concurrent opens.  A vfio_device reference is acquired for each device
+ * to prevent unbinds during the reset operation.
+ *
+ * NB: vfio-core considers a group to be viable even if some devices are
+ * bound to drivers like pci-stub or pcieport.  Here we require all devices
+ * to be bound to vfio_pci since that's the only way we can be sure they
+ * stay put.
+ */
+static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
+{
+	struct vfio_devices devs = { .cur_index = 0 };
+	int i = 0, ret = -EINVAL;
+	bool slot = false;
+	struct vfio_pci_device *tmp;
+
+	if (!pci_probe_reset_slot(vdev->pdev->slot))
+		slot = true;
+	else if (pci_probe_reset_bus(vdev->pdev->bus))
+		return;
+
+	if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs,
+					  &i, slot) || !i)
+		return;
+
+	devs.max_index = i;
+	devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL);
+	if (!devs.devices)
+		return;
+
+	if (vfio_pci_for_each_slot_or_bus(vdev->pdev,
+					  vfio_pci_get_unused_devs,
+					  &devs, slot))
+		goto put_devs;
+
+	/* Does at least one need a reset? */
+	for (i = 0; i < devs.cur_index; i++) {
+		tmp = vfio_device_data(devs.devices[i]);
+		if (tmp->needs_reset) {
+			ret = pci_reset_bus(vdev->pdev);
+			break;
+		}
+	}
+
+put_devs:
+	for (i = 0; i < devs.cur_index; i++) {
+		tmp = vfio_device_data(devs.devices[i]);
+
+		/*
+		 * If reset was successful, affected devices no longer need
+		 * a reset and we should return all the collateral devices
+		 * to low power.  If not successful, we either didn't reset
+		 * the bus or timed out waiting for it, so let's not touch
+		 * the power state.
+		 */
+		if (!ret) {
+			tmp->needs_reset = false;
+
+			if (tmp != vdev && !vdev->disable_idle_d3)
+				vfio_pci_set_power_state(tmp, PCI_D3hot);
+		}
+
+		vfio_device_put(devs.devices[i]);
+	}
+
+	kfree(devs.devices);
+}
+
+void __init vfio_pci_fill_ids(char *ids, struct pci_driver *driver)
+{
+	char *p, *id;
+	int rc;
+
+	/* no ids passed actually */
+	if (ids[0] == '\0')
+		return;
+
+	/* add ids specified in the module parameter */
+	p = ids;
+	while ((id = strsep(&p, ","))) {
+		unsigned int vendor, device, subvendor = PCI_ANY_ID,
+			subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
+		int fields;
+
+		if (!strlen(id))
+			continue;
+
+		fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
+				&vendor, &device, &subvendor, &subdevice,
+				&class, &class_mask);
+
+		if (fields < 2) {
+			pr_warn("invalid id string \"%s\"\n", id);
+			continue;
+		}
+
+		rc = pci_add_dynid(driver, vendor, device,
+				   subvendor, subdevice, class, class_mask, 0);
+		if (rc)
+			pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
+				vendor, device, subvendor, subdevice,
+				class, class_mask, rc);
+		else
+			pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
+				vendor, device, subvendor, subdevice,
+				class, class_mask);
+	}
+}
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 3fa20e9..6ce1a81 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -56,411 +56,6 @@ module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(disable_idle_d3,
 		 "Disable using the PCI D3 low power state for idle, unused devices");
 
-static inline bool vfio_vga_disabled(void)
-{
-#ifdef CONFIG_VFIO_PCI_VGA
-	return disable_vga;
-#else
-	return true;
-#endif
-}
-
-/*
- * Our VGA arbiter participation is limited since we don't know anything
- * about the device itself.  However, if the device is the only VGA device
- * downstream of a bridge and VFIO VGA support is disabled, then we can
- * safely return legacy VGA IO and memory as not decoded since the user
- * has no way to get to it and routing can be disabled externally at the
- * bridge.
- */
-static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga)
-{
-	struct vfio_pci_device *vdev = opaque;
-	struct pci_dev *tmp = NULL, *pdev = vdev->pdev;
-	unsigned char max_busnr;
-	unsigned int decodes;
-
-	if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
-		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
-		       VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
-
-	max_busnr = pci_bus_max_busnr(pdev->bus);
-	decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
-
-	while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
-		if (tmp == pdev ||
-		    pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
-		    pci_is_root_bus(tmp->bus))
-			continue;
-
-		if (tmp->bus->number >= pdev->bus->number &&
-		    tmp->bus->number <= max_busnr) {
-			pci_dev_put(tmp);
-			decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
-			break;
-		}
-	}
-
-	return decodes;
-}
-
-static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
-{
-	return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
-}
-
-static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
-{
-	struct resource *res;
-	int bar;
-	struct vfio_pci_dummy_resource *dummy_res;
-
-	INIT_LIST_HEAD(&vdev->dummy_resources_list);
-
-	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
-		res = vdev->pdev->resource + bar;
-
-		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
-			goto no_mmap;
-
-		if (!(res->flags & IORESOURCE_MEM))
-			goto no_mmap;
-
-		/*
-		 * The PCI core shouldn't set up a resource with a
-		 * type but zero size. But there may be bugs that
-		 * cause us to do that.
-		 */
-		if (!resource_size(res))
-			goto no_mmap;
-
-		if (resource_size(res) >= PAGE_SIZE) {
-			vdev->bar_mmap_supported[bar] = true;
-			continue;
-		}
-
-		if (!(res->start & ~PAGE_MASK)) {
-			/*
-			 * Add a dummy resource to reserve the remainder
-			 * of the exclusive page in case that hot-add
-			 * device's bar is assigned into it.
-			 */
-			dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
-			if (dummy_res == NULL)
-				goto no_mmap;
-
-			dummy_res->resource.name = "vfio sub-page reserved";
-			dummy_res->resource.start = res->end + 1;
-			dummy_res->resource.end = res->start + PAGE_SIZE - 1;
-			dummy_res->resource.flags = res->flags;
-			if (request_resource(res->parent,
-						&dummy_res->resource)) {
-				kfree(dummy_res);
-				goto no_mmap;
-			}
-			dummy_res->index = bar;
-			list_add(&dummy_res->res_next,
-					&vdev->dummy_resources_list);
-			vdev->bar_mmap_supported[bar] = true;
-			continue;
-		}
-		/*
-		 * Here we don't handle the case when the BAR is not page
-		 * aligned because we can't expect the BAR will be
-		 * assigned into the same location in a page in guest
-		 * when we passthrough the BAR. And it's hard to access
-		 * this BAR in userspace because we have no way to get
-		 * the BAR's location in a page.
-		 */
-no_mmap:
-		vdev->bar_mmap_supported[bar] = false;
-	}
-}
-
-static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
-static void vfio_pci_disable(struct vfio_pci_device *vdev);
-
-/*
- * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
- * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
- * If a device implements the former but not the latter we would typically
- * expect broken_intx_masking be set and require an exclusive interrupt.
- * However since we do have control of the device's ability to assert INTx,
- * we can instead pretend that the device does not implement INTx, virtualizing
- * the pin register to report zero and maintaining DisINTx set on the host.
- */
-static bool vfio_pci_nointx(struct pci_dev *pdev)
-{
-	switch (pdev->vendor) {
-	case PCI_VENDOR_ID_INTEL:
-		switch (pdev->device) {
-		/* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
-		case 0x1572:
-		case 0x1574:
-		case 0x1580 ... 0x1581:
-		case 0x1583 ... 0x158b:
-		case 0x37d0 ... 0x37d2:
-			return true;
-		default:
-			return false;
-		}
-	}
-
-	return false;
-}
-
-static void vfio_pci_probe_power_state(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	u16 pmcsr;
-
-	if (!pdev->pm_cap)
-		return;
-
-	pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr);
-
-	vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
-}
-
-/*
- * pci_set_power_state() wrapper handling devices which perform a soft reset on
- * D3->D0 transition.  Save state prior to D0/1/2->D3, stash it on the vdev,
- * restore when returned to D0.  Saved separately from pci_saved_state for use
- * by PM capability emulation and separately from pci_dev internal saved state
- * to avoid it being overwritten and consumed around other resets.
- */
-int vfio_pci_set_power_state(struct vfio_pci_device *vdev, pci_power_t state)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	bool needs_restore = false, needs_save = false;
-	int ret;
-
-	if (vdev->needs_pm_restore) {
-		if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) {
-			pci_save_state(pdev);
-			needs_save = true;
-		}
-
-		if (pdev->current_state >= PCI_D3hot && state <= PCI_D0)
-			needs_restore = true;
-	}
-
-	ret = pci_set_power_state(pdev, state);
-
-	if (!ret) {
-		/* D3 might be unsupported via quirk, skip unless in D3 */
-		if (needs_save && pdev->current_state >= PCI_D3hot) {
-			vdev->pm_save = pci_store_saved_state(pdev);
-		} else if (needs_restore) {
-			pci_load_and_free_saved_state(pdev, &vdev->pm_save);
-			pci_restore_state(pdev);
-		}
-	}
-
-	return ret;
-}
-
-static int vfio_pci_enable(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	int ret;
-	u16 cmd;
-	u8 msix_pos;
-
-	vfio_pci_set_power_state(vdev, PCI_D0);
-
-	/* Don't allow our initial saved state to include busmaster */
-	pci_clear_master(pdev);
-
-	ret = pci_enable_device(pdev);
-	if (ret)
-		return ret;
-
-	/* If reset fails because of the device lock, fail this path entirely */
-	ret = pci_try_reset_function(pdev);
-	if (ret == -EAGAIN) {
-		pci_disable_device(pdev);
-		return ret;
-	}
-
-	vdev->reset_works = !ret;
-	pci_save_state(pdev);
-	vdev->pci_saved_state = pci_store_saved_state(pdev);
-	if (!vdev->pci_saved_state)
-		pr_debug("%s: Couldn't store %s saved state\n",
-			 __func__, dev_name(&pdev->dev));
-
-	if (likely(!nointxmask)) {
-		if (vfio_pci_nointx(pdev)) {
-			dev_info(&pdev->dev, "Masking broken INTx support\n");
-			vdev->nointx = true;
-			pci_intx(pdev, 0);
-		} else
-			vdev->pci_2_3 = pci_intx_mask_supported(pdev);
-	}
-
-	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
-	if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
-		cmd &= ~PCI_COMMAND_INTX_DISABLE;
-		pci_write_config_word(pdev, PCI_COMMAND, cmd);
-	}
-
-	ret = vfio_config_init(vdev);
-	if (ret) {
-		kfree(vdev->pci_saved_state);
-		vdev->pci_saved_state = NULL;
-		pci_disable_device(pdev);
-		return ret;
-	}
-
-	msix_pos = pdev->msix_cap;
-	if (msix_pos) {
-		u16 flags;
-		u32 table;
-
-		pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
-		pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
-
-		vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
-		vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
-		vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
-	} else
-		vdev->msix_bar = 0xFF;
-
-	if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
-		vdev->has_vga = true;
-
-
-	if (vfio_pci_is_vga(pdev) &&
-	    pdev->vendor == PCI_VENDOR_ID_INTEL &&
-	    IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
-		ret = vfio_pci_igd_init(vdev);
-		if (ret) {
-			dev_warn(&vdev->pdev->dev,
-				 "Failed to setup Intel IGD regions\n");
-			goto disable_exit;
-		}
-	}
-
-	if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
-	    IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) {
-		ret = vfio_pci_nvdia_v100_nvlink2_init(vdev);
-		if (ret && ret != -ENODEV) {
-			dev_warn(&vdev->pdev->dev,
-				 "Failed to setup NVIDIA NV2 RAM region\n");
-			goto disable_exit;
-		}
-	}
-
-	if (pdev->vendor == PCI_VENDOR_ID_IBM &&
-	    IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) {
-		ret = vfio_pci_ibm_npu2_init(vdev);
-		if (ret && ret != -ENODEV) {
-			dev_warn(&vdev->pdev->dev,
-					"Failed to setup NVIDIA NV2 ATSD region\n");
-			goto disable_exit;
-		}
-	}
-
-	vfio_pci_probe_mmaps(vdev);
-
-	return 0;
-
-disable_exit:
-	vfio_pci_disable(vdev);
-	return ret;
-}
-
-static void vfio_pci_disable(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	struct vfio_pci_dummy_resource *dummy_res, *tmp;
-	struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
-	int i, bar;
-
-	/* Stop the device from further DMA */
-	pci_clear_master(pdev);
-
-	vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
-				VFIO_IRQ_SET_ACTION_TRIGGER,
-				vdev->irq_type, 0, 0, NULL);
-
-	/* Device closed, don't need mutex here */
-	list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
-				 &vdev->ioeventfds_list, next) {
-		vfio_virqfd_disable(&ioeventfd->virqfd);
-		list_del(&ioeventfd->next);
-		kfree(ioeventfd);
-	}
-	vdev->ioeventfds_nr = 0;
-
-	vdev->virq_disabled = false;
-
-	for (i = 0; i < vdev->num_regions; i++)
-		vdev->region[i].ops->release(vdev, &vdev->region[i]);
-
-	vdev->num_regions = 0;
-	kfree(vdev->region);
-	vdev->region = NULL; /* don't krealloc a freed pointer */
-
-	vfio_config_free(vdev);
-
-	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
-		if (!vdev->barmap[bar])
-			continue;
-		pci_iounmap(pdev, vdev->barmap[bar]);
-		pci_release_selected_regions(pdev, 1 << bar);
-		vdev->barmap[bar] = NULL;
-	}
-
-	list_for_each_entry_safe(dummy_res, tmp,
-				 &vdev->dummy_resources_list, res_next) {
-		list_del(&dummy_res->res_next);
-		release_resource(&dummy_res->resource);
-		kfree(dummy_res);
-	}
-
-	vdev->needs_reset = true;
-
-	/*
-	 * If we have saved state, restore it.  If we can reset the device,
-	 * even better.  Resetting with current state seems better than
-	 * nothing, but saving and restoring current state without reset
-	 * is just busy work.
-	 */
-	if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
-		pr_info("%s: Couldn't reload %s saved state\n",
-			__func__, dev_name(&pdev->dev));
-
-		if (!vdev->reset_works)
-			goto out;
-
-		pci_save_state(pdev);
-	}
-
-	/*
-	 * Disable INTx and MSI, presumably to avoid spurious interrupts
-	 * during reset.  Stolen from pci_reset_function()
-	 */
-	pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
-
-	/*
-	 * Try to reset the device.  The success of this is dependent on
-	 * being able to lock the device, which is not always possible.
-	 */
-	if (vdev->reset_works && !pci_try_reset_function(pdev))
-		vdev->needs_reset = false;
-
-	pci_restore_state(pdev);
-out:
-	pci_disable_device(pdev);
-
-	vfio_pci_try_bus_reset(vdev);
-
-	if (!disable_idle_d3)
-		vfio_pci_set_power_state(vdev, PCI_D3hot);
-}
-
 static void vfio_pci_release(void *device_data)
 {
 	struct vfio_pci_device *vdev = device_data;
@@ -502,776 +97,6 @@ static int vfio_pci_open(void *device_data)
 	return ret;
 }
 
-static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
-{
-	if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
-		u8 pin;
-
-		if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
-		    vdev->nointx || vdev->pdev->is_virtfn)
-			return 0;
-
-		pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
-
-		return pin ? 1 : 0;
-	} else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
-		u8 pos;
-		u16 flags;
-
-		pos = vdev->pdev->msi_cap;
-		if (pos) {
-			pci_read_config_word(vdev->pdev,
-					     pos + PCI_MSI_FLAGS, &flags);
-			return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
-		}
-	} else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
-		u8 pos;
-		u16 flags;
-
-		pos = vdev->pdev->msix_cap;
-		if (pos) {
-			pci_read_config_word(vdev->pdev,
-					     pos + PCI_MSIX_FLAGS, &flags);
-
-			return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
-		}
-	} else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
-		if (pci_is_pcie(vdev->pdev))
-			return 1;
-	} else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
-		return 1;
-	}
-
-	return 0;
-}
-
-static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
-{
-	(*(int *)data)++;
-	return 0;
-}
-
-struct vfio_pci_fill_info {
-	int max;
-	int cur;
-	struct vfio_pci_dependent_device *devices;
-};
-
-static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
-{
-	struct vfio_pci_fill_info *fill = data;
-	struct iommu_group *iommu_group;
-
-	if (fill->cur == fill->max)
-		return -EAGAIN; /* Something changed, try again */
-
-	iommu_group = iommu_group_get(&pdev->dev);
-	if (!iommu_group)
-		return -EPERM; /* Cannot reset non-isolated devices */
-
-	fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
-	fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
-	fill->devices[fill->cur].bus = pdev->bus->number;
-	fill->devices[fill->cur].devfn = pdev->devfn;
-	fill->cur++;
-	iommu_group_put(iommu_group);
-	return 0;
-}
-
-struct vfio_pci_group_entry {
-	struct vfio_group *group;
-	int id;
-};
-
-struct vfio_pci_group_info {
-	int count;
-	struct vfio_pci_group_entry *groups;
-};
-
-static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
-{
-	struct vfio_pci_group_info *info = data;
-	struct iommu_group *group;
-	int id, i;
-
-	group = iommu_group_get(&pdev->dev);
-	if (!group)
-		return -EPERM;
-
-	id = iommu_group_id(group);
-
-	for (i = 0; i < info->count; i++)
-		if (info->groups[i].id == id)
-			break;
-
-	iommu_group_put(group);
-
-	return (i == info->count) ? -EINVAL : 0;
-}
-
-static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
-{
-	for (; pdev; pdev = pdev->bus->self)
-		if (pdev->bus == slot->bus)
-			return (pdev->slot == slot);
-	return false;
-}
-
-struct vfio_pci_walk_info {
-	int (*fn)(struct pci_dev *, void *data);
-	void *data;
-	struct pci_dev *pdev;
-	bool slot;
-	int ret;
-};
-
-static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
-{
-	struct vfio_pci_walk_info *walk = data;
-
-	if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
-		walk->ret = walk->fn(pdev, walk->data);
-
-	return walk->ret;
-}
-
-static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
-					 int (*fn)(struct pci_dev *,
-						   void *data), void *data,
-					 bool slot)
-{
-	struct vfio_pci_walk_info walk = {
-		.fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
-	};
-
-	pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
-
-	return walk.ret;
-}
-
-static int msix_mmappable_cap(struct vfio_pci_device *vdev,
-			      struct vfio_info_cap *caps)
-{
-	struct vfio_info_cap_header header = {
-		.id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE,
-		.version = 1
-	};
-
-	return vfio_info_add_capability(caps, &header, sizeof(header));
-}
-
-int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
-				 unsigned int type, unsigned int subtype,
-				 const struct vfio_pci_regops *ops,
-				 size_t size, u32 flags, void *data)
-{
-	struct vfio_pci_region *region;
-
-	region = krealloc(vdev->region,
-			  (vdev->num_regions + 1) * sizeof(*region),
-			  GFP_KERNEL);
-	if (!region)
-		return -ENOMEM;
-
-	vdev->region = region;
-	vdev->region[vdev->num_regions].type = type;
-	vdev->region[vdev->num_regions].subtype = subtype;
-	vdev->region[vdev->num_regions].ops = ops;
-	vdev->region[vdev->num_regions].size = size;
-	vdev->region[vdev->num_regions].flags = flags;
-	vdev->region[vdev->num_regions].data = data;
-
-	vdev->num_regions++;
-
-	return 0;
-}
-
-static long vfio_pci_ioctl(void *device_data,
-			   unsigned int cmd, unsigned long arg)
-{
-	struct vfio_pci_device *vdev = device_data;
-	unsigned long minsz;
-
-	if (cmd == VFIO_DEVICE_GET_INFO) {
-		struct vfio_device_info info;
-
-		minsz = offsetofend(struct vfio_device_info, num_irqs);
-
-		if (copy_from_user(&info, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (info.argsz < minsz)
-			return -EINVAL;
-
-		info.flags = VFIO_DEVICE_FLAGS_PCI;
-
-		if (vdev->reset_works)
-			info.flags |= VFIO_DEVICE_FLAGS_RESET;
-
-		info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
-		info.num_irqs = VFIO_PCI_NUM_IRQS;
-
-		return copy_to_user((void __user *)arg, &info, minsz) ?
-			-EFAULT : 0;
-
-	} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
-		struct pci_dev *pdev = vdev->pdev;
-		struct vfio_region_info info;
-		struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
-		int i, ret;
-
-		minsz = offsetofend(struct vfio_region_info, offset);
-
-		if (copy_from_user(&info, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (info.argsz < minsz)
-			return -EINVAL;
-
-		switch (info.index) {
-		case VFIO_PCI_CONFIG_REGION_INDEX:
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.size = pdev->cfg_size;
-			info.flags = VFIO_REGION_INFO_FLAG_READ |
-				     VFIO_REGION_INFO_FLAG_WRITE;
-			break;
-		case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.size = pci_resource_len(pdev, info.index);
-			if (!info.size) {
-				info.flags = 0;
-				break;
-			}
-
-			info.flags = VFIO_REGION_INFO_FLAG_READ |
-				     VFIO_REGION_INFO_FLAG_WRITE;
-			if (vdev->bar_mmap_supported[info.index]) {
-				info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
-				if (info.index == vdev->msix_bar) {
-					ret = msix_mmappable_cap(vdev, &caps);
-					if (ret)
-						return ret;
-				}
-			}
-
-			break;
-		case VFIO_PCI_ROM_REGION_INDEX:
-		{
-			void __iomem *io;
-			size_t size;
-			u16 orig_cmd;
-
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.flags = 0;
-
-			/* Report the BAR size, not the ROM size */
-			info.size = pci_resource_len(pdev, info.index);
-			if (!info.size) {
-				/* Shadow ROMs appear as PCI option ROMs */
-				if (pdev->resource[PCI_ROM_RESOURCE].flags &
-							IORESOURCE_ROM_SHADOW)
-					info.size = 0x20000;
-				else
-					break;
-			}
-
-			/*
-			 * Is it really there?  Enable memory decode for
-			 * implicit access in pci_map_rom().
-			 */
-			pci_read_config_word(pdev, PCI_COMMAND, &orig_cmd);
-			pci_write_config_word(pdev, PCI_COMMAND,
-					      orig_cmd | PCI_COMMAND_MEMORY);
-
-			io = pci_map_rom(pdev, &size);
-			if (io) {
-				info.flags = VFIO_REGION_INFO_FLAG_READ;
-				pci_unmap_rom(pdev, io);
-			} else {
-				info.size = 0;
-			}
-
-			pci_write_config_word(pdev, PCI_COMMAND, orig_cmd);
-			break;
-		}
-		case VFIO_PCI_VGA_REGION_INDEX:
-			if (!vdev->has_vga)
-				return -EINVAL;
-
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.size = 0xc0000;
-			info.flags = VFIO_REGION_INFO_FLAG_READ |
-				     VFIO_REGION_INFO_FLAG_WRITE;
-
-			break;
-		default:
-		{
-			struct vfio_region_info_cap_type cap_type = {
-					.header.id = VFIO_REGION_INFO_CAP_TYPE,
-					.header.version = 1 };
-
-			if (info.index >=
-			    VFIO_PCI_NUM_REGIONS + vdev->num_regions)
-				return -EINVAL;
-			info.index = array_index_nospec(info.index,
-							VFIO_PCI_NUM_REGIONS +
-							vdev->num_regions);
-
-			i = info.index - VFIO_PCI_NUM_REGIONS;
-
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.size = vdev->region[i].size;
-			info.flags = vdev->region[i].flags;
-
-			cap_type.type = vdev->region[i].type;
-			cap_type.subtype = vdev->region[i].subtype;
-
-			ret = vfio_info_add_capability(&caps, &cap_type.header,
-						       sizeof(cap_type));
-			if (ret)
-				return ret;
-
-			if (vdev->region[i].ops->add_capability) {
-				ret = vdev->region[i].ops->add_capability(vdev,
-						&vdev->region[i], &caps);
-				if (ret)
-					return ret;
-			}
-		}
-		}
-
-		if (caps.size) {
-			info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
-			if (info.argsz < sizeof(info) + caps.size) {
-				info.argsz = sizeof(info) + caps.size;
-				info.cap_offset = 0;
-			} else {
-				vfio_info_cap_shift(&caps, sizeof(info));
-				if (copy_to_user((void __user *)arg +
-						  sizeof(info), caps.buf,
-						  caps.size)) {
-					kfree(caps.buf);
-					return -EFAULT;
-				}
-				info.cap_offset = sizeof(info);
-			}
-
-			kfree(caps.buf);
-		}
-
-		return copy_to_user((void __user *)arg, &info, minsz) ?
-			-EFAULT : 0;
-
-	} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
-		struct vfio_irq_info info;
-
-		minsz = offsetofend(struct vfio_irq_info, count);
-
-		if (copy_from_user(&info, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
-			return -EINVAL;
-
-		switch (info.index) {
-		case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
-		case VFIO_PCI_REQ_IRQ_INDEX:
-			break;
-		case VFIO_PCI_ERR_IRQ_INDEX:
-			if (pci_is_pcie(vdev->pdev))
-				break;
-		/* fall through */
-		default:
-			return -EINVAL;
-		}
-
-		info.flags = VFIO_IRQ_INFO_EVENTFD;
-
-		info.count = vfio_pci_get_irq_count(vdev, info.index);
-
-		if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
-			info.flags |= (VFIO_IRQ_INFO_MASKABLE |
-				       VFIO_IRQ_INFO_AUTOMASKED);
-		else
-			info.flags |= VFIO_IRQ_INFO_NORESIZE;
-
-		return copy_to_user((void __user *)arg, &info, minsz) ?
-			-EFAULT : 0;
-
-	} else if (cmd == VFIO_DEVICE_SET_IRQS) {
-		struct vfio_irq_set hdr;
-		u8 *data = NULL;
-		int max, ret = 0;
-		size_t data_size = 0;
-
-		minsz = offsetofend(struct vfio_irq_set, count);
-
-		if (copy_from_user(&hdr, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		max = vfio_pci_get_irq_count(vdev, hdr.index);
-
-		ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
-						 VFIO_PCI_NUM_IRQS, &data_size);
-		if (ret)
-			return ret;
-
-		if (data_size) {
-			data = memdup_user((void __user *)(arg + minsz),
-					    data_size);
-			if (IS_ERR(data))
-				return PTR_ERR(data);
-		}
-
-		mutex_lock(&vdev->igate);
-
-		ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
-					      hdr.start, hdr.count, data);
-
-		mutex_unlock(&vdev->igate);
-		kfree(data);
-
-		return ret;
-
-	} else if (cmd == VFIO_DEVICE_RESET) {
-		return vdev->reset_works ?
-			pci_try_reset_function(vdev->pdev) : -EINVAL;
-
-	} else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
-		struct vfio_pci_hot_reset_info hdr;
-		struct vfio_pci_fill_info fill = { 0 };
-		struct vfio_pci_dependent_device *devices = NULL;
-		bool slot = false;
-		int ret = 0;
-
-		minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
-
-		if (copy_from_user(&hdr, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (hdr.argsz < minsz)
-			return -EINVAL;
-
-		hdr.flags = 0;
-
-		/* Can we do a slot or bus reset or neither? */
-		if (!pci_probe_reset_slot(vdev->pdev->slot))
-			slot = true;
-		else if (pci_probe_reset_bus(vdev->pdev->bus))
-			return -ENODEV;
-
-		/* How many devices are affected? */
-		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
-						    vfio_pci_count_devs,
-						    &fill.max, slot);
-		if (ret)
-			return ret;
-
-		WARN_ON(!fill.max); /* Should always be at least one */
-
-		/*
-		 * If there's enough space, fill it now, otherwise return
-		 * -ENOSPC and the number of devices affected.
-		 */
-		if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
-			ret = -ENOSPC;
-			hdr.count = fill.max;
-			goto reset_info_exit;
-		}
-
-		devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
-		if (!devices)
-			return -ENOMEM;
-
-		fill.devices = devices;
-
-		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
-						    vfio_pci_fill_devs,
-						    &fill, slot);
-
-		/*
-		 * If a device was removed between counting and filling,
-		 * we may come up short of fill.max.  If a device was
-		 * added, we'll have a return of -EAGAIN above.
-		 */
-		if (!ret)
-			hdr.count = fill.cur;
-
-reset_info_exit:
-		if (copy_to_user((void __user *)arg, &hdr, minsz))
-			ret = -EFAULT;
-
-		if (!ret) {
-			if (copy_to_user((void __user *)(arg + minsz), devices,
-					 hdr.count * sizeof(*devices)))
-				ret = -EFAULT;
-		}
-
-		kfree(devices);
-		return ret;
-
-	} else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
-		struct vfio_pci_hot_reset hdr;
-		int32_t *group_fds;
-		struct vfio_pci_group_entry *groups;
-		struct vfio_pci_group_info info;
-		bool slot = false;
-		int i, count = 0, ret = 0;
-
-		minsz = offsetofend(struct vfio_pci_hot_reset, count);
-
-		if (copy_from_user(&hdr, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (hdr.argsz < minsz || hdr.flags)
-			return -EINVAL;
-
-		/* Can we do a slot or bus reset or neither? */
-		if (!pci_probe_reset_slot(vdev->pdev->slot))
-			slot = true;
-		else if (pci_probe_reset_bus(vdev->pdev->bus))
-			return -ENODEV;
-
-		/*
-		 * We can't let userspace give us an arbitrarily large
-		 * buffer to copy, so verify how many we think there
-		 * could be.  Note groups can have multiple devices so
-		 * one group per device is the max.
-		 */
-		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
-						    vfio_pci_count_devs,
-						    &count, slot);
-		if (ret)
-			return ret;
-
-		/* Somewhere between 1 and count is OK */
-		if (!hdr.count || hdr.count > count)
-			return -EINVAL;
-
-		group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
-		groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
-		if (!group_fds || !groups) {
-			kfree(group_fds);
-			kfree(groups);
-			return -ENOMEM;
-		}
-
-		if (copy_from_user(group_fds, (void __user *)(arg + minsz),
-				   hdr.count * sizeof(*group_fds))) {
-			kfree(group_fds);
-			kfree(groups);
-			return -EFAULT;
-		}
-
-		/*
-		 * For each group_fd, get the group through the vfio external
-		 * user interface and store the group and iommu ID.  This
-		 * ensures the group is held across the reset.
-		 */
-		for (i = 0; i < hdr.count; i++) {
-			struct vfio_group *group;
-			struct fd f = fdget(group_fds[i]);
-			if (!f.file) {
-				ret = -EBADF;
-				break;
-			}
-
-			group = vfio_group_get_external_user(f.file);
-			fdput(f);
-			if (IS_ERR(group)) {
-				ret = PTR_ERR(group);
-				break;
-			}
-
-			groups[i].group = group;
-			groups[i].id = vfio_external_user_iommu_id(group);
-		}
-
-		kfree(group_fds);
-
-		/* release reference to groups on error */
-		if (ret)
-			goto hot_reset_release;
-
-		info.count = hdr.count;
-		info.groups = groups;
-
-		/*
-		 * Test whether all the affected devices are contained
-		 * by the set of groups provided by the user.
-		 */
-		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
-						    vfio_pci_validate_devs,
-						    &info, slot);
-		if (!ret)
-			/* User has access, do the reset */
-			ret = pci_reset_bus(vdev->pdev);
-
-hot_reset_release:
-		for (i--; i >= 0; i--)
-			vfio_group_put_external_user(groups[i].group);
-
-		kfree(groups);
-		return ret;
-	} else if (cmd == VFIO_DEVICE_IOEVENTFD) {
-		struct vfio_device_ioeventfd ioeventfd;
-		int count;
-
-		minsz = offsetofend(struct vfio_device_ioeventfd, fd);
-
-		if (copy_from_user(&ioeventfd, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (ioeventfd.argsz < minsz)
-			return -EINVAL;
-
-		if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK)
-			return -EINVAL;
-
-		count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK;
-
-		if (hweight8(count) != 1 || ioeventfd.fd < -1)
-			return -EINVAL;
-
-		return vfio_pci_ioeventfd(vdev, ioeventfd.offset,
-					  ioeventfd.data, count, ioeventfd.fd);
-	}
-
-	return -ENOTTY;
-}
-
-static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
-			   size_t count, loff_t *ppos, bool iswrite)
-{
-	unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
-	struct vfio_pci_device *vdev = device_data;
-
-	if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
-		return -EINVAL;
-
-	switch (index) {
-	case VFIO_PCI_CONFIG_REGION_INDEX:
-		return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
-
-	case VFIO_PCI_ROM_REGION_INDEX:
-		if (iswrite)
-			return -EINVAL;
-		return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
-
-	case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
-		return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
-
-	case VFIO_PCI_VGA_REGION_INDEX:
-		return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
-	default:
-		index -= VFIO_PCI_NUM_REGIONS;
-		return vdev->region[index].ops->rw(vdev, buf,
-						   count, ppos, iswrite);
-	}
-
-	return -EINVAL;
-}
-
-static ssize_t vfio_pci_read(void *device_data, char __user *buf,
-			     size_t count, loff_t *ppos)
-{
-	if (!count)
-		return 0;
-
-	return vfio_pci_rw(device_data, buf, count, ppos, false);
-}
-
-static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
-			      size_t count, loff_t *ppos)
-{
-	if (!count)
-		return 0;
-
-	return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
-}
-
-static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
-{
-	struct vfio_pci_device *vdev = device_data;
-	struct pci_dev *pdev = vdev->pdev;
-	unsigned int index;
-	u64 phys_len, req_len, pgoff, req_start;
-	int ret;
-
-	index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
-
-	if (vma->vm_end < vma->vm_start)
-		return -EINVAL;
-	if ((vma->vm_flags & VM_SHARED) == 0)
-		return -EINVAL;
-	if (index >= VFIO_PCI_NUM_REGIONS) {
-		int regnum = index - VFIO_PCI_NUM_REGIONS;
-		struct vfio_pci_region *region = vdev->region + regnum;
-
-		if (region && region->ops && region->ops->mmap &&
-		    (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
-			return region->ops->mmap(vdev, region, vma);
-		return -EINVAL;
-	}
-	if (index >= VFIO_PCI_ROM_REGION_INDEX)
-		return -EINVAL;
-	if (!vdev->bar_mmap_supported[index])
-		return -EINVAL;
-
-	phys_len = PAGE_ALIGN(pci_resource_len(pdev, index));
-	req_len = vma->vm_end - vma->vm_start;
-	pgoff = vma->vm_pgoff &
-		((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
-	req_start = pgoff << PAGE_SHIFT;
-
-	if (req_start + req_len > phys_len)
-		return -EINVAL;
-
-	/*
-	 * Even though we don't make use of the barmap for the mmap,
-	 * we need to request the region and the barmap tracks that.
-	 */
-	if (!vdev->barmap[index]) {
-		ret = pci_request_selected_regions(pdev,
-						   1 << index, "vfio-pci");
-		if (ret)
-			return ret;
-
-		vdev->barmap[index] = pci_iomap(pdev, index, 0);
-		if (!vdev->barmap[index]) {
-			pci_release_selected_regions(pdev, 1 << index);
-			return -ENOMEM;
-		}
-	}
-
-	vma->vm_private_data = vdev;
-	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-	vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
-
-	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
-			       req_len, vma->vm_page_prot);
-}
-
-static void vfio_pci_request(void *device_data, unsigned int count)
-{
-	struct vfio_pci_device *vdev = device_data;
-
-	mutex_lock(&vdev->igate);
-
-	if (vdev->req_trigger) {
-		if (!(count % 10))
-			dev_notice_ratelimited(&vdev->pdev->dev,
-				"Relaying device request to user (#%u)\n",
-				count);
-		eventfd_signal(vdev->req_trigger, 1);
-	} else if (count == 0) {
-		dev_warn(&vdev->pdev->dev,
-			"No device request channel registered, blocked until released by user\n");
-	}
-
-	mutex_unlock(&vdev->igate);
-}
-
 static const struct vfio_device_ops vfio_pci_ops = {
 	.name		= "vfio-pci",
 	.open		= vfio_pci_open,
@@ -1283,8 +108,6 @@ static const struct vfio_device_ops vfio_pci_ops = {
 	.request	= vfio_pci_request,
 };
 
-static int vfio_pci_reflck_attach(struct vfio_pci_device *vdev);
-static void vfio_pci_reflck_put(struct vfio_pci_reflck *reflck);
 
 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
@@ -1324,6 +147,11 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	spin_lock_init(&vdev->irqlock);
 	mutex_init(&vdev->ioeventfds_lock);
 	INIT_LIST_HEAD(&vdev->ioeventfds_list);
+	vdev->nointxmask = nointxmask;
+#ifdef CONFIG_VFIO_PCI_VGA
+	vdev->disable_vga = disable_vga;
+#endif
+	vdev->disable_idle_d3 = disable_idle_d3;
 
 	ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
 	if (ret) {
@@ -1340,27 +168,13 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return ret;
 	}
 
-	if (vfio_pci_is_vga(pdev)) {
-		vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode);
-		vga_set_legacy_decoding(pdev,
-					vfio_pci_set_vga_decode(vdev, false));
-	}
+	if (vfio_pci_is_vga(pdev))
+		vfio_pci_vga_probe(vdev);
 
 	vfio_pci_probe_power_state(vdev);
 
-	if (!disable_idle_d3) {
-		/*
-		 * pci-core sets the device power state to an unknown value at
-		 * bootup and after being removed from a driver.  The only
-		 * transition it allows from this unknown state is to D0, which
-		 * typically happens when a driver calls pci_enable_device().
-		 * We're not ready to enable the device yet, but we do want to
-		 * be able to get to D3.  Therefore first do a D0 transition
-		 * before going to D3.
-		 */
-		vfio_pci_set_power_state(vdev, PCI_D0);
-		vfio_pci_set_power_state(vdev, PCI_D3hot);
-	}
+	if (!disable_idle_d3)
+		vfio_pci_probe_idle_d3(vdev);
 
 	return ret;
 }
@@ -1383,48 +197,14 @@ static void vfio_pci_remove(struct pci_dev *pdev)
 		vfio_pci_set_power_state(vdev, PCI_D0);
 
 	kfree(vdev->pm_save);
-	kfree(vdev);
 
 	if (vfio_pci_is_vga(pdev)) {
-		vga_client_register(pdev, NULL, NULL, NULL);
-		vga_set_legacy_decoding(pdev,
-				VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
-				VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
-	}
-}
-
-static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
-						  pci_channel_state_t state)
-{
-	struct vfio_pci_device *vdev;
-	struct vfio_device *device;
-
-	device = vfio_device_get_from_dev(&pdev->dev);
-	if (device == NULL)
-		return PCI_ERS_RESULT_DISCONNECT;
-
-	vdev = vfio_device_data(device);
-	if (vdev == NULL) {
-		vfio_device_put(device);
-		return PCI_ERS_RESULT_DISCONNECT;
+		vfio_pci_vga_remove(vdev);
 	}
 
-	mutex_lock(&vdev->igate);
-
-	if (vdev->err_trigger)
-		eventfd_signal(vdev->err_trigger, 1);
-
-	mutex_unlock(&vdev->igate);
-
-	vfio_device_put(device);
-
-	return PCI_ERS_RESULT_CAN_RECOVER;
+	kfree(vdev);
 }
 
-static const struct pci_error_handlers vfio_err_handlers = {
-	.error_detected = vfio_pci_aer_err_detected,
-};
-
 static struct pci_driver vfio_pci_driver = {
 	.name		= "vfio-pci",
 	.id_table	= NULL, /* only dynamic ids */
@@ -1433,244 +213,12 @@ static struct pci_driver vfio_pci_driver = {
 	.err_handler	= &vfio_err_handlers,
 };
 
-static DEFINE_MUTEX(reflck_lock);
-
-static struct vfio_pci_reflck *vfio_pci_reflck_alloc(void)
-{
-	struct vfio_pci_reflck *reflck;
-
-	reflck = kzalloc(sizeof(*reflck), GFP_KERNEL);
-	if (!reflck)
-		return ERR_PTR(-ENOMEM);
-
-	kref_init(&reflck->kref);
-	mutex_init(&reflck->lock);
-
-	return reflck;
-}
-
-static void vfio_pci_reflck_get(struct vfio_pci_reflck *reflck)
-{
-	kref_get(&reflck->kref);
-}
-
-static int vfio_pci_reflck_find(struct pci_dev *pdev, void *data)
-{
-	struct vfio_pci_reflck **preflck = data;
-	struct vfio_device *device;
-	struct vfio_pci_device *vdev;
-
-	device = vfio_device_get_from_dev(&pdev->dev);
-	if (!device)
-		return 0;
-
-	if (pci_dev_driver(pdev) != &vfio_pci_driver) {
-		vfio_device_put(device);
-		return 0;
-	}
-
-	vdev = vfio_device_data(device);
-
-	if (vdev->reflck) {
-		vfio_pci_reflck_get(vdev->reflck);
-		*preflck = vdev->reflck;
-		vfio_device_put(device);
-		return 1;
-	}
-
-	vfio_device_put(device);
-	return 0;
-}
-
-static int vfio_pci_reflck_attach(struct vfio_pci_device *vdev)
-{
-	bool slot = !pci_probe_reset_slot(vdev->pdev->slot);
-
-	mutex_lock(&reflck_lock);
-
-	if (pci_is_root_bus(vdev->pdev->bus) ||
-	    vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_reflck_find,
-					  &vdev->reflck, slot) <= 0)
-		vdev->reflck = vfio_pci_reflck_alloc();
-
-	mutex_unlock(&reflck_lock);
-
-	return PTR_ERR_OR_ZERO(vdev->reflck);
-}
-
-static void vfio_pci_reflck_release(struct kref *kref)
-{
-	struct vfio_pci_reflck *reflck = container_of(kref,
-						      struct vfio_pci_reflck,
-						      kref);
-
-	kfree(reflck);
-	mutex_unlock(&reflck_lock);
-}
-
-static void vfio_pci_reflck_put(struct vfio_pci_reflck *reflck)
-{
-	kref_put_mutex(&reflck->kref, vfio_pci_reflck_release, &reflck_lock);
-}
-
-struct vfio_devices {
-	struct vfio_device **devices;
-	int cur_index;
-	int max_index;
-};
-
-static int vfio_pci_get_unused_devs(struct pci_dev *pdev, void *data)
-{
-	struct vfio_devices *devs = data;
-	struct vfio_device *device;
-	struct vfio_pci_device *vdev;
-
-	if (devs->cur_index == devs->max_index)
-		return -ENOSPC;
-
-	device = vfio_device_get_from_dev(&pdev->dev);
-	if (!device)
-		return -EINVAL;
-
-	if (pci_dev_driver(pdev) != &vfio_pci_driver) {
-		vfio_device_put(device);
-		return -EBUSY;
-	}
-
-	vdev = vfio_device_data(device);
-
-	/* Fault if the device is not unused */
-	if (vdev->refcnt) {
-		vfio_device_put(device);
-		return -EBUSY;
-	}
-
-	devs->devices[devs->cur_index++] = device;
-	return 0;
-}
-
-/*
- * If a bus or slot reset is available for the provided device and:
- *  - All of the devices affected by that bus or slot reset are unused
- *    (!refcnt)
- *  - At least one of the affected devices is marked dirty via
- *    needs_reset (such as by lack of FLR support)
- * Then attempt to perform that bus or slot reset.  Callers are required
- * to hold vdev->reflck->lock, protecting the bus/slot reset group from
- * concurrent opens.  A vfio_device reference is acquired for each device
- * to prevent unbinds during the reset operation.
- *
- * NB: vfio-core considers a group to be viable even if some devices are
- * bound to drivers like pci-stub or pcieport.  Here we require all devices
- * to be bound to vfio_pci since that's the only way we can be sure they
- * stay put.
- */
-static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
-{
-	struct vfio_devices devs = { .cur_index = 0 };
-	int i = 0, ret = -EINVAL;
-	bool slot = false;
-	struct vfio_pci_device *tmp;
-
-	if (!pci_probe_reset_slot(vdev->pdev->slot))
-		slot = true;
-	else if (pci_probe_reset_bus(vdev->pdev->bus))
-		return;
-
-	if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs,
-					  &i, slot) || !i)
-		return;
-
-	devs.max_index = i;
-	devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL);
-	if (!devs.devices)
-		return;
-
-	if (vfio_pci_for_each_slot_or_bus(vdev->pdev,
-					  vfio_pci_get_unused_devs,
-					  &devs, slot))
-		goto put_devs;
-
-	/* Does at least one need a reset? */
-	for (i = 0; i < devs.cur_index; i++) {
-		tmp = vfio_device_data(devs.devices[i]);
-		if (tmp->needs_reset) {
-			ret = pci_reset_bus(vdev->pdev);
-			break;
-		}
-	}
-
-put_devs:
-	for (i = 0; i < devs.cur_index; i++) {
-		tmp = vfio_device_data(devs.devices[i]);
-
-		/*
-		 * If reset was successful, affected devices no longer need
-		 * a reset and we should return all the collateral devices
-		 * to low power.  If not successful, we either didn't reset
-		 * the bus or timed out waiting for it, so let's not touch
-		 * the power state.
-		 */
-		if (!ret) {
-			tmp->needs_reset = false;
-
-			if (tmp != vdev && !disable_idle_d3)
-				vfio_pci_set_power_state(tmp, PCI_D3hot);
-		}
-
-		vfio_device_put(devs.devices[i]);
-	}
-
-	kfree(devs.devices);
-}
-
 static void __exit vfio_pci_cleanup(void)
 {
 	pci_unregister_driver(&vfio_pci_driver);
 	vfio_pci_uninit_perm_bits();
 }
 
-static void __init vfio_pci_fill_ids(void)
-{
-	char *p, *id;
-	int rc;
-
-	/* no ids passed actually */
-	if (ids[0] == '\0')
-		return;
-
-	/* add ids specified in the module parameter */
-	p = ids;
-	while ((id = strsep(&p, ","))) {
-		unsigned int vendor, device, subvendor = PCI_ANY_ID,
-			subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
-		int fields;
-
-		if (!strlen(id))
-			continue;
-
-		fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
-				&vendor, &device, &subvendor, &subdevice,
-				&class, &class_mask);
-
-		if (fields < 2) {
-			pr_warn("invalid id string \"%s\"\n", id);
-			continue;
-		}
-
-		rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
-				   subvendor, subdevice, class, class_mask, 0);
-		if (rc)
-			pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
-				vendor, device, subvendor, subdevice,
-				class, class_mask, rc);
-		else
-			pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
-				vendor, device, subvendor, subdevice,
-				class, class_mask);
-	}
-}
-
 static int __init vfio_pci_init(void)
 {
 	int ret;
@@ -1685,7 +233,7 @@ static int __init vfio_pci_init(void)
 	if (ret)
 		goto out_driver;
 
-	vfio_pci_fill_ids();
+	vfio_pci_fill_ids(&ids[0], &vfio_pci_driver);
 
 	return 0;
 
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index 1812cf2..9bbf22c 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -125,6 +125,11 @@ struct vfio_pci_device {
 	struct list_head	dummy_resources_list;
 	struct mutex		ioeventfds_lock;
 	struct list_head	ioeventfds_list;
+	bool			nointxmask;
+#ifdef CONFIG_VFIO_PCI_VGA
+	bool			disable_vga;
+#endif
+	bool			disable_idle_d3;
 };
 
 #define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
@@ -133,6 +138,8 @@ struct vfio_pci_device {
 #define is_irq_none(vdev) (!(is_intx(vdev) || is_msi(vdev) || is_msix(vdev)))
 #define irq_is(vdev, type) (vdev->irq_type == type)
 
+extern const struct pci_error_handlers vfio_err_handlers;
+
 extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev);
 extern void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);
 
@@ -167,6 +174,26 @@ extern int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
 extern int vfio_pci_set_power_state(struct vfio_pci_device *vdev,
 				    pci_power_t state);
 
+extern int vfio_pci_enable(struct vfio_pci_device *vdev);
+extern void vfio_pci_disable(struct vfio_pci_device *vdev);
+extern long vfio_pci_ioctl(void *device_data,
+			unsigned int cmd, unsigned long arg);
+extern ssize_t vfio_pci_read(void *device_data, char __user *buf,
+			size_t count, loff_t *ppos);
+extern ssize_t vfio_pci_write(void *device_data, const char __user *buf,
+			size_t count, loff_t *ppos);
+extern int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma);
+extern void vfio_pci_request(void *device_data, unsigned int count);
+extern void vfio_pci_fill_ids(char *ids, struct pci_driver *driver);
+extern int vfio_pci_reflck_attach(struct vfio_pci_device *vdev);
+extern void vfio_pci_reflck_put(struct vfio_pci_reflck *reflck);
+extern inline bool vfio_vga_disabled(struct vfio_pci_device *vdev);
+extern void vfio_pci_probe_power_state(struct vfio_pci_device *vdev);
+extern void vfio_pci_probe_idle_d3(struct vfio_pci_device *vdev);
+extern void vfio_pci_vga_probe(struct vfio_pci_device *vdev);
+extern void vfio_pci_vga_remove(struct vfio_pci_device *vdev);
+extern bool vfio_pci_is_vga(struct pci_dev *pdev);
+
 #ifdef CONFIG_VFIO_PCI_IGD
 extern int vfio_pci_igd_init(struct vfio_pci_device *vdev);
 #else
-- 
2.7.4


  reply	other threads:[~2019-04-24 12:31 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-23 12:14 [RFC v3 0/3] vfio_pci: wrap pci device as a mediated device Liu, Yi L
2019-04-23 12:14 ` Liu, Yi L [this message]
2019-05-14 16:21   ` [RFC v3 1/3] vfio_pci: split vfio_pci.c into two source files Alex Williamson
2019-04-23 12:14 ` [RFC v3 2/3] vfio/pci: protect cap/ecap_perm bits alloc/free with atomic op Liu, Yi L
2019-04-23 12:14 ` [RFC v3 3/3] smaples: add vfio-mdev-pci driver Liu, Yi L
2019-05-23  8:44 ` [RFC v3 0/3] vfio_pci: wrap pci device as a mediated device Liu, Yi L
2019-05-23 13:03   ` Alex Williamson
2019-06-09 13:40     ` Liu, Yi L

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