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Message-Id: <1556021680-2911-2-git-send-email-yi.l.liu@intel.com>
Date: Tue, 23 Apr 2019 20:14:38 +0800
From: "Liu, Yi L" <yi.l.liu@...el.com>
To: alex.williamson@...hat.com, kwankhede@...dia.com
Cc: kevin.tian@...el.com, baolu.lu@...ux.intel.com, yi.l.liu@...el.com,
yi.y.sun@...el.com, joro@...tes.org, jean-philippe.brucker@....com,
peterx@...hat.com, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org, yamada.masahiro@...ionext.com,
iommu@...ts.linux-foundation.org, Liu@...r.kernel.org
Subject: [RFC v3 1/3] vfio_pci: split vfio_pci.c into two source files
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@...el.com>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Liu, Yi L <yi.l.liu@...el.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@...el.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@...hat.com>
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@...co.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
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