1076 lines
26 KiB
C
1076 lines
26 KiB
C
/*
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* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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* Author: Alex Williamson <alex.williamson@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Derived from original vfio:
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* Copyright 2010 Cisco Systems, Inc. All rights reserved.
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* Author: Tom Lyon, pugs@cisco.com
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*/
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#include <linux/device.h>
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#include <linux/eventfd.h>
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#include <linux/file.h>
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#include <linux/interrupt.h>
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#include <linux/iommu.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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#include <linux/pci.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/vfio.h>
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#include "vfio_pci_private.h"
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#define DRIVER_VERSION "0.2"
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#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
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#define DRIVER_DESC "VFIO PCI - User Level meta-driver"
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static bool nointxmask;
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module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(nointxmask,
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"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.");
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static DEFINE_MUTEX(driver_lock);
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static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
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static int vfio_pci_enable(struct vfio_pci_device *vdev)
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{
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struct pci_dev *pdev = vdev->pdev;
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int ret;
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u16 cmd;
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u8 msix_pos;
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/* Don't allow our initial saved state to include busmaster */
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pci_clear_master(pdev);
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ret = pci_enable_device(pdev);
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if (ret)
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return ret;
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vdev->reset_works = (pci_reset_function(pdev) == 0);
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pci_save_state(pdev);
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vdev->pci_saved_state = pci_store_saved_state(pdev);
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if (!vdev->pci_saved_state)
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pr_debug("%s: Couldn't store %s saved state\n",
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__func__, dev_name(&pdev->dev));
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ret = vfio_config_init(vdev);
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if (ret) {
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kfree(vdev->pci_saved_state);
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vdev->pci_saved_state = NULL;
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pci_disable_device(pdev);
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return ret;
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}
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if (likely(!nointxmask))
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vdev->pci_2_3 = pci_intx_mask_supported(pdev);
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pci_read_config_word(pdev, PCI_COMMAND, &cmd);
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if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
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cmd &= ~PCI_COMMAND_INTX_DISABLE;
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pci_write_config_word(pdev, PCI_COMMAND, cmd);
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}
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msix_pos = pdev->msix_cap;
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if (msix_pos) {
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u16 flags;
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u32 table;
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pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
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pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
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vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
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vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
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vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
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} else
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vdev->msix_bar = 0xFF;
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#ifdef CONFIG_VFIO_PCI_VGA
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if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
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vdev->has_vga = true;
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#endif
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return 0;
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}
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static void vfio_pci_disable(struct vfio_pci_device *vdev)
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{
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struct pci_dev *pdev = vdev->pdev;
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int bar;
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/* Stop the device from further DMA */
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pci_clear_master(pdev);
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vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
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VFIO_IRQ_SET_ACTION_TRIGGER,
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vdev->irq_type, 0, 0, NULL);
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vdev->virq_disabled = false;
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vfio_config_free(vdev);
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for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
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if (!vdev->barmap[bar])
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continue;
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pci_iounmap(pdev, vdev->barmap[bar]);
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pci_release_selected_regions(pdev, 1 << bar);
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vdev->barmap[bar] = NULL;
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}
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vdev->needs_reset = true;
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/*
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* If we have saved state, restore it. If we can reset the device,
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* even better. Resetting with current state seems better than
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* nothing, but saving and restoring current state without reset
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* is just busy work.
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*/
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if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
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pr_info("%s: Couldn't reload %s saved state\n",
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__func__, dev_name(&pdev->dev));
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if (!vdev->reset_works)
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goto out;
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pci_save_state(pdev);
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}
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/*
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* Disable INTx and MSI, presumably to avoid spurious interrupts
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* during reset. Stolen from pci_reset_function()
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*/
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pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
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/*
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* Try to reset the device. The success of this is dependent on
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* being able to lock the device, which is not always possible.
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*/
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if (vdev->reset_works) {
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int ret = pci_try_reset_function(pdev);
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if (ret)
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pr_warn("%s: Failed to reset device %s (%d)\n",
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__func__, dev_name(&pdev->dev), ret);
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else
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vdev->needs_reset = false;
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}
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pci_restore_state(pdev);
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out:
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pci_disable_device(pdev);
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vfio_pci_try_bus_reset(vdev);
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}
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static void vfio_pci_release(void *device_data)
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{
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struct vfio_pci_device *vdev = device_data;
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mutex_lock(&driver_lock);
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if (!(--vdev->refcnt)) {
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vfio_spapr_pci_eeh_release(vdev->pdev);
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vfio_pci_disable(vdev);
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}
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mutex_unlock(&driver_lock);
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module_put(THIS_MODULE);
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}
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static int vfio_pci_open(void *device_data)
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{
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struct vfio_pci_device *vdev = device_data;
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int ret = 0;
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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mutex_lock(&driver_lock);
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if (!vdev->refcnt) {
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ret = vfio_pci_enable(vdev);
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if (ret)
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goto error;
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vfio_spapr_pci_eeh_open(vdev->pdev);
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}
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vdev->refcnt++;
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error:
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mutex_unlock(&driver_lock);
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if (ret)
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module_put(THIS_MODULE);
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return ret;
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}
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static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
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{
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if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
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u8 pin;
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pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
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if (pin)
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return 1;
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} else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
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u8 pos;
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u16 flags;
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pos = vdev->pdev->msi_cap;
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if (pos) {
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pci_read_config_word(vdev->pdev,
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pos + PCI_MSI_FLAGS, &flags);
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return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
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}
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} else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
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u8 pos;
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u16 flags;
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pos = vdev->pdev->msix_cap;
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if (pos) {
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pci_read_config_word(vdev->pdev,
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pos + PCI_MSIX_FLAGS, &flags);
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return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
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}
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} else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX)
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if (pci_is_pcie(vdev->pdev))
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return 1;
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return 0;
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}
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static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
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{
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(*(int *)data)++;
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return 0;
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}
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struct vfio_pci_fill_info {
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int max;
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int cur;
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struct vfio_pci_dependent_device *devices;
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};
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static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
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{
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struct vfio_pci_fill_info *fill = data;
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struct iommu_group *iommu_group;
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if (fill->cur == fill->max)
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return -EAGAIN; /* Something changed, try again */
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iommu_group = iommu_group_get(&pdev->dev);
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if (!iommu_group)
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return -EPERM; /* Cannot reset non-isolated devices */
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fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
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fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
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fill->devices[fill->cur].bus = pdev->bus->number;
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fill->devices[fill->cur].devfn = pdev->devfn;
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fill->cur++;
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iommu_group_put(iommu_group);
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return 0;
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}
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struct vfio_pci_group_entry {
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struct vfio_group *group;
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int id;
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};
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struct vfio_pci_group_info {
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int count;
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struct vfio_pci_group_entry *groups;
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};
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static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
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{
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struct vfio_pci_group_info *info = data;
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struct iommu_group *group;
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int id, i;
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group = iommu_group_get(&pdev->dev);
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if (!group)
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return -EPERM;
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id = iommu_group_id(group);
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for (i = 0; i < info->count; i++)
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if (info->groups[i].id == id)
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break;
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iommu_group_put(group);
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return (i == info->count) ? -EINVAL : 0;
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}
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static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
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{
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for (; pdev; pdev = pdev->bus->self)
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if (pdev->bus == slot->bus)
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return (pdev->slot == slot);
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return false;
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}
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struct vfio_pci_walk_info {
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int (*fn)(struct pci_dev *, void *data);
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void *data;
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struct pci_dev *pdev;
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bool slot;
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int ret;
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};
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static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
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{
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struct vfio_pci_walk_info *walk = data;
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if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
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walk->ret = walk->fn(pdev, walk->data);
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return walk->ret;
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}
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static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
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int (*fn)(struct pci_dev *,
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void *data), void *data,
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bool slot)
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{
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struct vfio_pci_walk_info walk = {
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.fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
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};
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pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
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return walk.ret;
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}
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static long vfio_pci_ioctl(void *device_data,
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unsigned int cmd, unsigned long arg)
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{
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struct vfio_pci_device *vdev = device_data;
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unsigned long minsz;
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if (cmd == VFIO_DEVICE_GET_INFO) {
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struct vfio_device_info info;
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minsz = offsetofend(struct vfio_device_info, num_irqs);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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info.flags = VFIO_DEVICE_FLAGS_PCI;
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if (vdev->reset_works)
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info.flags |= VFIO_DEVICE_FLAGS_RESET;
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info.num_regions = VFIO_PCI_NUM_REGIONS;
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info.num_irqs = VFIO_PCI_NUM_IRQS;
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return copy_to_user((void __user *)arg, &info, minsz);
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} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
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struct pci_dev *pdev = vdev->pdev;
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struct vfio_region_info info;
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minsz = offsetofend(struct vfio_region_info, offset);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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switch (info.index) {
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case VFIO_PCI_CONFIG_REGION_INDEX:
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info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
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info.size = pdev->cfg_size;
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info.flags = VFIO_REGION_INFO_FLAG_READ |
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VFIO_REGION_INFO_FLAG_WRITE;
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break;
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case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
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info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
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info.size = pci_resource_len(pdev, info.index);
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if (!info.size) {
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info.flags = 0;
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break;
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}
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info.flags = VFIO_REGION_INFO_FLAG_READ |
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VFIO_REGION_INFO_FLAG_WRITE;
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if (pci_resource_flags(pdev, info.index) &
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IORESOURCE_MEM && info.size >= PAGE_SIZE)
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info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
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break;
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case VFIO_PCI_ROM_REGION_INDEX:
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{
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void __iomem *io;
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size_t size;
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info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
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info.flags = 0;
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/* Report the BAR size, not the ROM size */
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info.size = pci_resource_len(pdev, info.index);
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if (!info.size)
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break;
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/* Is it really there? */
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io = pci_map_rom(pdev, &size);
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if (!io || !size) {
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info.size = 0;
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break;
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}
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pci_unmap_rom(pdev, io);
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info.flags = VFIO_REGION_INFO_FLAG_READ;
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break;
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}
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case VFIO_PCI_VGA_REGION_INDEX:
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if (!vdev->has_vga)
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return -EINVAL;
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info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
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info.size = 0xc0000;
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info.flags = VFIO_REGION_INFO_FLAG_READ |
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VFIO_REGION_INFO_FLAG_WRITE;
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break;
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default:
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return -EINVAL;
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}
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return copy_to_user((void __user *)arg, &info, minsz);
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} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
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struct vfio_irq_info info;
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minsz = offsetofend(struct vfio_irq_info, count);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
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return -EINVAL;
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switch (info.index) {
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case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
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break;
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case VFIO_PCI_ERR_IRQ_INDEX:
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if (pci_is_pcie(vdev->pdev))
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break;
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/* pass thru to return error */
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default:
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return -EINVAL;
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}
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info.flags = VFIO_IRQ_INFO_EVENTFD;
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info.count = vfio_pci_get_irq_count(vdev, info.index);
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if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
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info.flags |= (VFIO_IRQ_INFO_MASKABLE |
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VFIO_IRQ_INFO_AUTOMASKED);
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else
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info.flags |= VFIO_IRQ_INFO_NORESIZE;
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return copy_to_user((void __user *)arg, &info, minsz);
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} else if (cmd == VFIO_DEVICE_SET_IRQS) {
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struct vfio_irq_set hdr;
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u8 *data = NULL;
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int ret = 0;
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minsz = offsetofend(struct vfio_irq_set, count);
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if (copy_from_user(&hdr, (void __user *)arg, minsz))
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return -EFAULT;
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|
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if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS ||
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hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
|
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VFIO_IRQ_SET_ACTION_TYPE_MASK))
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return -EINVAL;
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|
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if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
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size_t size;
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int max = vfio_pci_get_irq_count(vdev, hdr.index);
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|
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if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
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size = sizeof(uint8_t);
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else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
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size = sizeof(int32_t);
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else
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return -EINVAL;
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|
|
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 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,
|
|
};
|
|
|
|
static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
|
{
|
|
u8 type;
|
|
struct vfio_pci_device *vdev;
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
pci_read_config_byte(pdev, PCI_HEADER_TYPE, &type);
|
|
if ((type & PCI_HEADER_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;
|
|
}
|
|
|
|
static void vfio_pci_remove(struct pci_dev *pdev)
|
|
{
|
|
struct vfio_pci_device *vdev;
|
|
|
|
mutex_lock(&driver_lock);
|
|
|
|
vdev = vfio_del_group_dev(&pdev->dev);
|
|
if (vdev) {
|
|
iommu_group_put(pdev->dev.iommu_group);
|
|
kfree(vdev);
|
|
}
|
|
|
|
mutex_unlock(&driver_lock);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
/*
|
|
* Test whether a reset is necessary and possible. We mark devices as
|
|
* needs_reset when they are released, but don't have a function-local reset
|
|
* available. If any of these exist in the affected devices, we want to do
|
|
* a bus/slot reset. We also need all of the affected devices to be unused,
|
|
* so we abort if any device has a non-zero refcnt. driver_lock prevents a
|
|
* device from being opened during the scan or unbound from vfio-pci.
|
|
*/
|
|
static int vfio_pci_test_bus_reset(struct pci_dev *pdev, void *data)
|
|
{
|
|
bool *needs_reset = data;
|
|
struct pci_driver *pci_drv = ACCESS_ONCE(pdev->driver);
|
|
int ret = -EBUSY;
|
|
|
|
if (pci_drv == &vfio_pci_driver) {
|
|
struct vfio_device *device;
|
|
struct vfio_pci_device *vdev;
|
|
|
|
device = vfio_device_get_from_dev(&pdev->dev);
|
|
if (!device)
|
|
return ret;
|
|
|
|
vdev = vfio_device_data(device);
|
|
if (vdev) {
|
|
if (vdev->needs_reset)
|
|
*needs_reset = true;
|
|
|
|
if (!vdev->refcnt)
|
|
ret = 0;
|
|
}
|
|
|
|
vfio_device_put(device);
|
|
}
|
|
|
|
/*
|
|
* TODO: vfio-core considers groups to be viable even if some devices
|
|
* are attached to known drivers, like pci-stub or pcieport. We can't
|
|
* freeze devices from being unbound to those drivers like we can
|
|
* here though, so it would be racy to test for them. We also can't
|
|
* use device_lock() to prevent changes as that would interfere with
|
|
* PCI-core taking device_lock during bus reset. For now, we require
|
|
* devices to be bound to vfio-pci to get a bus/slot reset on release.
|
|
*/
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Clear needs_reset on all affected devices after successful bus/slot reset */
|
|
static int vfio_pci_clear_needs_reset(struct pci_dev *pdev, void *data)
|
|
{
|
|
struct pci_driver *pci_drv = ACCESS_ONCE(pdev->driver);
|
|
|
|
if (pci_drv == &vfio_pci_driver) {
|
|
struct vfio_device *device;
|
|
struct vfio_pci_device *vdev;
|
|
|
|
device = vfio_device_get_from_dev(&pdev->dev);
|
|
if (!device)
|
|
return 0;
|
|
|
|
vdev = vfio_device_data(device);
|
|
if (vdev)
|
|
vdev->needs_reset = false;
|
|
|
|
vfio_device_put(device);
|
|
}
|
|
|
|
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 of this function are required to hold driver_lock such
|
|
* that devices can not be unbound from vfio-pci or opened by a user while we
|
|
* test for and perform a bus/slot reset.
|
|
*/
|
|
static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
|
|
{
|
|
bool needs_reset = false, slot = false;
|
|
int ret;
|
|
|
|
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_test_bus_reset,
|
|
&needs_reset, slot) || !needs_reset)
|
|
return;
|
|
|
|
if (slot)
|
|
ret = pci_try_reset_slot(vdev->pdev->slot);
|
|
else
|
|
ret = pci_try_reset_bus(vdev->pdev->bus);
|
|
|
|
if (ret)
|
|
return;
|
|
|
|
vfio_pci_for_each_slot_or_bus(vdev->pdev,
|
|
vfio_pci_clear_needs_reset, NULL, slot);
|
|
}
|
|
|
|
static void __exit vfio_pci_cleanup(void)
|
|
{
|
|
pci_unregister_driver(&vfio_pci_driver);
|
|
vfio_pci_virqfd_exit();
|
|
vfio_pci_uninit_perm_bits();
|
|
}
|
|
|
|
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;
|
|
|
|
/* Start the virqfd cleanup handler */
|
|
ret = vfio_pci_virqfd_init();
|
|
if (ret)
|
|
goto out_virqfd;
|
|
|
|
/* Register and scan for devices */
|
|
ret = pci_register_driver(&vfio_pci_driver);
|
|
if (ret)
|
|
goto out_driver;
|
|
|
|
return 0;
|
|
|
|
out_driver:
|
|
vfio_pci_virqfd_exit();
|
|
out_virqfd:
|
|
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);
|