| /* |
| * Copyright (C) 2012 Red Hat, Inc. All rights reserved. |
| * Author: Alex Williamson <alex.williamson@redhat.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: |
| * 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 "vfio_pci_private.h" |
| |
| #define DRIVER_VERSION "0.2" |
| #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" |
| #define DRIVER_DESC "VFIO PCI - User Level meta-driver" |
| |
| static char ids[1024] __initdata; |
| module_param_string(ids, ids, sizeof(ids), 0); |
| MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified"); |
| |
| static bool nointxmask; |
| module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(nointxmask, |
| "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag."); |
| |
| #ifdef CONFIG_VFIO_PCI_VGA |
| static bool disable_vga; |
| module_param(disable_vga, bool, S_IRUGO); |
| MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci"); |
| #endif |
| |
| static bool disable_idle_d3; |
| 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 DEFINE_MUTEX(driver_lock); |
| |
| 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_try_bus_reset(struct vfio_pci_device *vdev); |
| |
| static int vfio_pci_enable(struct vfio_pci_device *vdev) |
| { |
| struct pci_dev *pdev = vdev->pdev; |
| int ret; |
| u16 cmd; |
| u8 msix_pos; |
| |
| pci_set_power_state(pdev, 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; |
| |
| vdev->reset_works = (pci_reset_function(pdev) == 0); |
| 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)); |
| |
| ret = vfio_config_init(vdev); |
| if (ret) { |
| kfree(vdev->pci_saved_state); |
| vdev->pci_saved_state = NULL; |
| pci_disable_device(pdev); |
| return ret; |
| } |
| |
| if (likely(!nointxmask)) |
| 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); |
| } |
| |
| 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; |
| |
| return 0; |
| } |
| |
| static void vfio_pci_disable(struct vfio_pci_device *vdev) |
| { |
| struct pci_dev *pdev = vdev->pdev; |
| int 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); |
| |
| vdev->virq_disabled = false; |
| |
| 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; |
| } |
| |
| 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) |
| pci_set_power_state(pdev, PCI_D3hot); |
| } |
| |
| static void vfio_pci_release(void *device_data) |
| { |
| struct vfio_pci_device *vdev = device_data; |
| |
| mutex_lock(&driver_lock); |
| |
| if (!(--vdev->refcnt)) { |
| vfio_spapr_pci_eeh_release(vdev->pdev); |
| vfio_pci_disable(vdev); |
| } |
| |
| mutex_unlock(&driver_lock); |
| |
| module_put(THIS_MODULE); |
| } |
| |
| static int vfio_pci_open(void *device_data) |
| { |
| struct vfio_pci_device *vdev = device_data; |
| int ret = 0; |
| |
| if (!try_module_get(THIS_MODULE)) |
| return -ENODEV; |
| |
| mutex_lock(&driver_lock); |
| |
| if (!vdev->refcnt) { |
| ret = vfio_pci_enable(vdev); |
| if (ret) |
| goto error; |
| |
| vfio_spapr_pci_eeh_open(vdev->pdev); |
| } |
| vdev->refcnt++; |
| error: |
| mutex_unlock(&driver_lock); |
| if (ret) |
| module_put(THIS_MODULE); |
| 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; |
| pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin); |
| if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && pin) |
| return 1; |
| |
| } 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 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; |
| info.num_irqs = VFIO_PCI_NUM_IRQS; |
| |
| return copy_to_user((void __user *)arg, &info, minsz); |
| |
| } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { |
| struct pci_dev *pdev = vdev->pdev; |
| struct vfio_region_info info; |
| |
| 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 (IS_ENABLED(CONFIG_VFIO_PCI_MMAP) && |
| pci_resource_flags(pdev, info.index) & |
| IORESOURCE_MEM && info.size >= PAGE_SIZE) |
| info.flags |= VFIO_REGION_INFO_FLAG_MMAP; |
| break; |
| case VFIO_PCI_ROM_REGION_INDEX: |
| { |
| void __iomem *io; |
| size_t size; |
| |
| 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) |
| break; |
| |
| /* Is it really there? */ |
| io = pci_map_rom(pdev, &size); |
| if (!io || !size) { |
| info.size = 0; |
| break; |
| } |
| pci_unmap_rom(pdev, io); |
| |
| info.flags = VFIO_REGION_INFO_FLAG_READ; |
| 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: |
| return -EINVAL; |
| } |
| |
| return copy_to_user((void __user *)arg, &info, minsz); |
| |
| } 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; |
| /* pass thru to return error */ |
| 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); |
| |
| } else if (cmd == VFIO_DEVICE_SET_IRQS) { |
| struct vfio_irq_set hdr; |
| u8 *data = NULL; |
| int ret = 0; |
| |
| minsz = offsetofend(struct vfio_irq_set, count); |
| |
| if (copy_from_user(&hdr, (void __user *)arg, minsz)) |
| return -EFAULT; |
| |
| if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS || |
| hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK | |
| VFIO_IRQ_SET_ACTION_TYPE_MASK)) |
| return -EINVAL; |
| |
| if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) { |
| size_t size; |
| int max = vfio_pci_get_irq_count(vdev, hdr.index); |
| |
| if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL) |
| size = sizeof(uint8_t); |
| else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD) |
| size = sizeof(int32_t); |
| else |
| return -EINVAL; |
| |
| if (hdr.argsz - minsz < hdr.count * size || |
| hdr.start >= max || hdr.start + hdr.count > max) |
| return -EINVAL; |
| |
| data = memdup_user((void __user *)(arg + minsz), |
| hdr.count * 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 = slot ? pci_try_reset_slot(vdev->pdev->slot) : |
| pci_try_reset_bus(vdev->pdev->bus); |
| |
| hot_reset_release: |
| for (i--; i >= 0; i--) |
| vfio_group_put_external_user(groups[i].group); |
| |
| kfree(groups); |
| return ret; |
| } |
| |
| 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) |
| 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); |
| } |
| |
| 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_ROM_REGION_INDEX) |
| return -EINVAL; |
| if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM)) |
| return -EINVAL; |
| |
| phys_len = 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 (phys_len < PAGE_SIZE || req_start + req_len > phys_len) |
| return -EINVAL; |
| |
| if (index == vdev->msix_bar) { |
| /* |
| * Disallow mmaps overlapping the MSI-X table; users don't |
| * get to touch this directly. We could find somewhere |
| * else to map the overlap, but page granularity is only |
| * a recommendation, not a requirement, so the user needs |
| * to know which bits are real. Requiring them to mmap |
| * around the table makes that clear. |
| */ |
| |
| /* If neither entirely above nor below, then it overlaps */ |
| if (!(req_start >= vdev->msix_offset + vdev->msix_size || |
| req_start + req_len <= vdev->msix_offset)) |
| 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); |
| } |
| |
| 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) { |
| dev_dbg(&vdev->pdev->dev, "Requesting device from user\n"); |
| eventfd_signal(vdev->req_trigger, 1); |
| } |
| |
| mutex_unlock(&vdev->igate); |
| } |
| |
| static const struct vfio_device_ops vfio_pci_ops = { |
| .name = "vfio-pci", |
| .open = vfio_pci_open, |
| .release = vfio_pci_release, |
| .ioctl = vfio_pci_ioctl, |
| .read = vfio_pci_read, |
| .write = vfio_pci_write, |
| .mmap = vfio_pci_mmap, |
| .request = vfio_pci_request, |
| }; |
| |
| static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
| { |
| struct vfio_pci_device *vdev; |
| struct iommu_group *group; |
| int ret; |
| |
| if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) |
| return -EINVAL; |
| |
| group = iommu_group_get(&pdev->dev); |
| if (!group) |
| return -EINVAL; |
| |
| vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); |
| if (!vdev) { |
| iommu_group_put(group); |
| return -ENOMEM; |
| } |
| |
| vdev->pdev = pdev; |
| vdev->irq_type = VFIO_PCI_NUM_IRQS; |
| mutex_init(&vdev->igate); |
| spin_lock_init(&vdev->irqlock); |
| |
| ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); |
| if (ret) { |
| iommu_group_put(group); |
| kfree(vdev); |
| 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 (!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. |
| */ |
| pci_set_power_state(pdev, PCI_D0); |
| pci_set_power_state(pdev, PCI_D3hot); |
| } |
| |
| return ret; |
| } |
| |
| static void vfio_pci_remove(struct pci_dev *pdev) |
| { |
| struct vfio_pci_device *vdev; |
| |
| vdev = vfio_del_group_dev(&pdev->dev); |
| if (!vdev) |
| return; |
| |
| iommu_group_put(pdev->dev.iommu_group); |
| 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); |
| } |
| |
| if (!disable_idle_d3) |
| pci_set_power_state(pdev, PCI_D0); |
| } |
| |
| 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; |
| } |
| |
| static 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 */ |
| .probe = vfio_pci_probe, |
| .remove = vfio_pci_remove, |
| .err_handler = &vfio_err_handlers, |
| }; |
| |
| struct vfio_devices { |
| struct vfio_device **devices; |
| int cur_index; |
| int max_index; |
| }; |
| |
| static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) |
| { |
| struct vfio_devices *devs = data; |
| struct pci_driver *pci_drv = ACCESS_ONCE(pdev->driver); |
| |
| if (pci_drv != &vfio_pci_driver) |
| return -EBUSY; |
| |
| if (devs->cur_index == devs->max_index) |
| return -ENOSPC; |
| |
| devs->devices[devs->cur_index] = vfio_device_get_from_dev(&pdev->dev); |
| if (!devs->devices[devs->cur_index]) |
| return -EINVAL; |
| |
| devs->cur_index++; |
| return 0; |
| } |
| |
| /* |
| * Attempt to do a bus/slot reset if there are devices affected by a reset for |
| * this device that are needs_reset and all of the affected devices are unused |
| * (!refcnt). Callers are required to hold driver_lock when calling this to |
| * prevent device opens and concurrent bus reset attempts. We prevent device |
| * unbinds by acquiring and holding a reference to the vfio_device. |
| * |
| * 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 needs_reset = false, 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_devs, &devs, slot)) |
| goto put_devs; |
| |
| for (i = 0; i < devs.cur_index; i++) { |
| tmp = vfio_device_data(devs.devices[i]); |
| if (tmp->needs_reset) |
| needs_reset = true; |
| if (tmp->refcnt) |
| goto put_devs; |
| } |
| |
| if (needs_reset) |
| ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : |
| pci_try_reset_bus(vdev->pdev->bus); |
| |
| put_devs: |
| for (i = 0; i < devs.cur_index; i++) { |
| tmp = vfio_device_data(devs.devices[i]); |
| if (!ret) |
| tmp->needs_reset = false; |
| |
| if (!tmp->refcnt && !disable_idle_d3) |
| pci_set_power_state(tmp->pdev, 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 [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", |
| vendor, device, subvendor, subdevice, |
| class, class_mask, rc); |
| else |
| pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", |
| vendor, device, subvendor, subdevice, |
| class, class_mask); |
| } |
| } |
| |
| static int __init vfio_pci_init(void) |
| { |
| int ret; |
| |
| /* Allocate shared config space permision data used by all devices */ |
| ret = vfio_pci_init_perm_bits(); |
| if (ret) |
| return ret; |
| |
| /* Register and scan for devices */ |
| ret = pci_register_driver(&vfio_pci_driver); |
| if (ret) |
| goto out_driver; |
| |
| vfio_pci_fill_ids(); |
| |
| return 0; |
| |
| out_driver: |
| vfio_pci_uninit_perm_bits(); |
| return ret; |
| } |
| |
| module_init(vfio_pci_init); |
| module_exit(vfio_pci_cleanup); |
| |
| MODULE_VERSION(DRIVER_VERSION); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |