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https://github.com/edk2-porting/linux-next.git
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89b6b8cd92
- Fix dma-valid return WAITED implementation (Anthony Yznaga) - SPDX license cleanups (Cai Huoqing) - Split vfio-pci-core from vfio-pci and enhance PCI driver matching to support future vendor provided vfio-pci variants (Yishai Hadas, Max Gurtovoy, Jason Gunthorpe) - Replace duplicated reflck with core support for managing first open, last close, and device sets (Jason Gunthorpe, Max Gurtovoy, Yishai Hadas) - Fix non-modular mdev support and don't nag about request callback support (Christoph Hellwig) - Add semaphore to protect instruction intercept handler and replace open-coded locks in vfio-ap driver (Tony Krowiak) - Convert vfio-ap to vfio_register_group_dev() API (Jason Gunthorpe) -----BEGIN PGP SIGNATURE----- iQJPBAABCAA5FiEEQvbATlQL0amee4qQI5ubbjuwiyIFAmEvwWkbHGFsZXgud2ls bGlhbXNvbkByZWRoYXQuY29tAAoJECObm247sIsi+1UP/3CRizghroINVYR+cJ99 Tjz7lB/wlzxmRfX+SL4NAVe1SSB2VeCgU4B0PF6kywELLS8OhCO3HXYXVsz244fW Gk5UIns86+TFTrfCOMpwYBV0P86zuaa1ZnvCnkhMK1i2pTZ+oX8hUH1Yj5clHuU+ YgC7JfEuTIAX73q2bC/llLvNE9ke1QCoDX3+HAH87ttqutnRWcnnq56PTEqwe+EW eMA+glB1UG6JAqXxoJET4155arNOny1/ZMprfBr3YXZTiXDF/lSzuMyUtbp526Sf hsvlnqtE6TCdfKbog0Lxckl+8E9NCq8jzFBKiZhbccrQv3vVaoP6dOsPWcT35Kp1 IjzMLiHIbl4wXOL+Xap/biz3LCM5BMdT/OhW5LUC007zggK71ndRvb9F8ptW83Bv 0Uh9DNv7YIQ0su3JHZEsJ3qPFXQXceP199UiADOGSeV8U1Qig3YKsHUDMuALfFvN t+NleeJ4qCWao+W4VCfyDfKurVnMj/cThXiDEWEeq5gMOO+6YKBIFWJVKFxUYDbf MgGdg0nQTUECuXKXxLD4c1HAWH9xi207OnLvhW1Icywp20MsYqOWt0vhg+PRdMBT DK6STxP18aQxCaOuQN9Vf81LjhXNTeg+xt3mMyViOZPcKfX6/wAC9qLt4MucJDdw FBfOz2UL2F56dhAYT+1vHoUM =nzK7 -----END PGP SIGNATURE----- Merge tag 'vfio-v5.15-rc1' of git://github.com/awilliam/linux-vfio Pull VFIO updates from Alex Williamson: - Fix dma-valid return WAITED implementation (Anthony Yznaga) - SPDX license cleanups (Cai Huoqing) - Split vfio-pci-core from vfio-pci and enhance PCI driver matching to support future vendor provided vfio-pci variants (Yishai Hadas, Max Gurtovoy, Jason Gunthorpe) - Replace duplicated reflck with core support for managing first open, last close, and device sets (Jason Gunthorpe, Max Gurtovoy, Yishai Hadas) - Fix non-modular mdev support and don't nag about request callback support (Christoph Hellwig) - Add semaphore to protect instruction intercept handler and replace open-coded locks in vfio-ap driver (Tony Krowiak) - Convert vfio-ap to vfio_register_group_dev() API (Jason Gunthorpe) * tag 'vfio-v5.15-rc1' of git://github.com/awilliam/linux-vfio: (37 commits) vfio/pci: Introduce vfio_pci_core.ko vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on' vfio: Use select for eventfd PCI / VFIO: Add 'override_only' support for VFIO PCI sub system PCI: Add 'override_only' field to struct pci_device_id vfio/pci: Move module parameters to vfio_pci.c vfio/pci: Move igd initialization to vfio_pci.c vfio/pci: Split the pci_driver code out of vfio_pci_core.c vfio/pci: Include vfio header in vfio_pci_core.h vfio/pci: Rename ops functions to fit core namings vfio/pci: Rename vfio_pci_device to vfio_pci_core_device vfio/pci: Rename vfio_pci_private.h to vfio_pci_core.h vfio/pci: Rename vfio_pci.c to vfio_pci_core.c vfio/ap_ops: Convert to use vfio_register_group_dev() s390/vfio-ap: replace open coded locks for VFIO_GROUP_NOTIFY_SET_KVM notification s390/vfio-ap: r/w lock for PQAP interception handler function pointer vfio/type1: Fix vfio_find_dma_valid return vfio-pci/zdev: Remove repeated verbose license text vfio: platform: reset: Convert to SPDX identifier vfio: Remove struct vfio_device_ops open/release ...
2158 lines
55 KiB
C
2158 lines
55 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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* 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/vgaarb.h>
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#include <linux/nospec.h>
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#include <linux/sched/mm.h>
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#include <linux/vfio_pci_core.h>
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#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
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#define DRIVER_DESC "core driver for VFIO based PCI devices"
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static bool nointxmask;
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static bool disable_vga;
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static bool disable_idle_d3;
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static inline bool vfio_vga_disabled(void)
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{
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#ifdef CONFIG_VFIO_PCI_VGA
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return disable_vga;
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#else
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return true;
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#endif
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}
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/*
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* Our VGA arbiter participation is limited since we don't know anything
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* about the device itself. However, if the device is the only VGA device
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* downstream of a bridge and VFIO VGA support is disabled, then we can
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* safely return legacy VGA IO and memory as not decoded since the user
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* has no way to get to it and routing can be disabled externally at the
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* bridge.
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*/
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static unsigned int vfio_pci_set_decode(struct pci_dev *pdev, bool single_vga)
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{
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struct pci_dev *tmp = NULL;
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unsigned char max_busnr;
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unsigned int decodes;
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if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
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return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
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VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
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max_busnr = pci_bus_max_busnr(pdev->bus);
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decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
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while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
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if (tmp == pdev ||
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pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
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pci_is_root_bus(tmp->bus))
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continue;
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if (tmp->bus->number >= pdev->bus->number &&
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tmp->bus->number <= max_busnr) {
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pci_dev_put(tmp);
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decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
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break;
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}
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}
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return decodes;
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}
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static void vfio_pci_probe_mmaps(struct vfio_pci_core_device *vdev)
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{
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struct resource *res;
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int i;
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struct vfio_pci_dummy_resource *dummy_res;
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for (i = 0; i < PCI_STD_NUM_BARS; i++) {
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int bar = i + PCI_STD_RESOURCES;
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res = &vdev->pdev->resource[bar];
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if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
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goto no_mmap;
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if (!(res->flags & IORESOURCE_MEM))
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goto no_mmap;
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/*
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* The PCI core shouldn't set up a resource with a
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* type but zero size. But there may be bugs that
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* cause us to do that.
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*/
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if (!resource_size(res))
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goto no_mmap;
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if (resource_size(res) >= PAGE_SIZE) {
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vdev->bar_mmap_supported[bar] = true;
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continue;
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}
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if (!(res->start & ~PAGE_MASK)) {
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/*
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* Add a dummy resource to reserve the remainder
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* of the exclusive page in case that hot-add
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* device's bar is assigned into it.
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*/
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dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
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if (dummy_res == NULL)
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goto no_mmap;
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dummy_res->resource.name = "vfio sub-page reserved";
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dummy_res->resource.start = res->end + 1;
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dummy_res->resource.end = res->start + PAGE_SIZE - 1;
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dummy_res->resource.flags = res->flags;
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if (request_resource(res->parent,
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&dummy_res->resource)) {
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kfree(dummy_res);
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goto no_mmap;
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}
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dummy_res->index = bar;
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list_add(&dummy_res->res_next,
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&vdev->dummy_resources_list);
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vdev->bar_mmap_supported[bar] = true;
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continue;
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}
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/*
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* Here we don't handle the case when the BAR is not page
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* aligned because we can't expect the BAR will be
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* assigned into the same location in a page in guest
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* when we passthrough the BAR. And it's hard to access
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* this BAR in userspace because we have no way to get
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* the BAR's location in a page.
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*/
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no_mmap:
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vdev->bar_mmap_supported[bar] = false;
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}
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}
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struct vfio_pci_group_info;
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static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set);
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static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
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struct vfio_pci_group_info *groups);
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/*
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* INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
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* _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
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* If a device implements the former but not the latter we would typically
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* expect broken_intx_masking be set and require an exclusive interrupt.
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* However since we do have control of the device's ability to assert INTx,
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* we can instead pretend that the device does not implement INTx, virtualizing
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* the pin register to report zero and maintaining DisINTx set on the host.
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*/
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static bool vfio_pci_nointx(struct pci_dev *pdev)
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{
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switch (pdev->vendor) {
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case PCI_VENDOR_ID_INTEL:
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switch (pdev->device) {
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/* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
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case 0x1572:
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case 0x1574:
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case 0x1580 ... 0x1581:
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case 0x1583 ... 0x158b:
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case 0x37d0 ... 0x37d2:
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/* X550 */
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case 0x1563:
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return true;
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default:
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return false;
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}
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}
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return false;
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}
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static void vfio_pci_probe_power_state(struct vfio_pci_core_device *vdev)
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{
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struct pci_dev *pdev = vdev->pdev;
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u16 pmcsr;
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if (!pdev->pm_cap)
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return;
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pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr);
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vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
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}
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/*
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* pci_set_power_state() wrapper handling devices which perform a soft reset on
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* D3->D0 transition. Save state prior to D0/1/2->D3, stash it on the vdev,
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* restore when returned to D0. Saved separately from pci_saved_state for use
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* by PM capability emulation and separately from pci_dev internal saved state
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* to avoid it being overwritten and consumed around other resets.
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*/
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int vfio_pci_set_power_state(struct vfio_pci_core_device *vdev, pci_power_t state)
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{
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struct pci_dev *pdev = vdev->pdev;
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bool needs_restore = false, needs_save = false;
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int ret;
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if (vdev->needs_pm_restore) {
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if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) {
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pci_save_state(pdev);
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needs_save = true;
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}
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if (pdev->current_state >= PCI_D3hot && state <= PCI_D0)
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needs_restore = true;
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}
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ret = pci_set_power_state(pdev, state);
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if (!ret) {
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/* D3 might be unsupported via quirk, skip unless in D3 */
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if (needs_save && pdev->current_state >= PCI_D3hot) {
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vdev->pm_save = pci_store_saved_state(pdev);
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} else if (needs_restore) {
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pci_load_and_free_saved_state(pdev, &vdev->pm_save);
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pci_restore_state(pdev);
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}
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}
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return ret;
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}
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int vfio_pci_core_enable(struct vfio_pci_core_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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vfio_pci_set_power_state(vdev, PCI_D0);
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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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/* If reset fails because of the device lock, fail this path entirely */
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ret = pci_try_reset_function(pdev);
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if (ret == -EAGAIN) {
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pci_disable_device(pdev);
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return ret;
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}
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vdev->reset_works = !ret;
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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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pci_dbg(pdev, "%s: Couldn't store saved state\n", __func__);
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if (likely(!nointxmask)) {
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if (vfio_pci_nointx(pdev)) {
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pci_info(pdev, "Masking broken INTx support\n");
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vdev->nointx = true;
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pci_intx(pdev, 0);
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} else
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vdev->pci_2_3 = pci_intx_mask_supported(pdev);
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}
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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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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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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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if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
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vdev->has_vga = true;
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return 0;
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}
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EXPORT_SYMBOL_GPL(vfio_pci_core_enable);
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void vfio_pci_core_disable(struct vfio_pci_core_device *vdev)
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{
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struct pci_dev *pdev = vdev->pdev;
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struct vfio_pci_dummy_resource *dummy_res, *tmp;
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struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
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int i, bar;
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|
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/* For needs_reset */
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lockdep_assert_held(&vdev->vdev.dev_set->lock);
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|
|
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/* Stop the device from further DMA */
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pci_clear_master(pdev);
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|
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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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|
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/* Device closed, don't need mutex here */
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list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
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&vdev->ioeventfds_list, next) {
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vfio_virqfd_disable(&ioeventfd->virqfd);
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list_del(&ioeventfd->next);
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kfree(ioeventfd);
|
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}
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vdev->ioeventfds_nr = 0;
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|
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vdev->virq_disabled = false;
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|
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for (i = 0; i < vdev->num_regions; i++)
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vdev->region[i].ops->release(vdev, &vdev->region[i]);
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|
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vdev->num_regions = 0;
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kfree(vdev->region);
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vdev->region = NULL; /* don't krealloc a freed pointer */
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vfio_config_free(vdev);
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|
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for (i = 0; i < PCI_STD_NUM_BARS; i++) {
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bar = i + PCI_STD_RESOURCES;
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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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list_for_each_entry_safe(dummy_res, tmp,
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&vdev->dummy_resources_list, res_next) {
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list_del(&dummy_res->res_next);
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release_resource(&dummy_res->resource);
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kfree(dummy_res);
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}
|
|
|
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vdev->needs_reset = true;
|
|
|
|
/*
|
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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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if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
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pci_info(pdev, "%s: Couldn't reload saved state\n", __func__);
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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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}
|
|
|
|
/*
|
|
* Disable INTx and MSI, presumably to avoid spurious interrupts
|
|
* during reset. Stolen from pci_reset_function()
|
|
*/
|
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pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
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|
|
|
/*
|
|
* Try to get the locks ourselves to prevent a deadlock. The
|
|
* success of this is dependent on being able to lock the device,
|
|
* which is not always possible.
|
|
* We can not use the "try" reset interface here, which will
|
|
* overwrite the previously restored configuration information.
|
|
*/
|
|
if (vdev->reset_works && pci_dev_trylock(pdev)) {
|
|
if (!__pci_reset_function_locked(pdev))
|
|
vdev->needs_reset = false;
|
|
pci_dev_unlock(pdev);
|
|
}
|
|
|
|
pci_restore_state(pdev);
|
|
out:
|
|
pci_disable_device(pdev);
|
|
|
|
if (!vfio_pci_dev_set_try_reset(vdev->vdev.dev_set) && !disable_idle_d3)
|
|
vfio_pci_set_power_state(vdev, PCI_D3hot);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_disable);
|
|
|
|
static struct vfio_pci_core_device *get_pf_vdev(struct vfio_pci_core_device *vdev)
|
|
{
|
|
struct pci_dev *physfn = pci_physfn(vdev->pdev);
|
|
struct vfio_device *pf_dev;
|
|
|
|
if (!vdev->pdev->is_virtfn)
|
|
return NULL;
|
|
|
|
pf_dev = vfio_device_get_from_dev(&physfn->dev);
|
|
if (!pf_dev)
|
|
return NULL;
|
|
|
|
if (pci_dev_driver(physfn) != pci_dev_driver(vdev->pdev)) {
|
|
vfio_device_put(pf_dev);
|
|
return NULL;
|
|
}
|
|
|
|
return container_of(pf_dev, struct vfio_pci_core_device, vdev);
|
|
}
|
|
|
|
static void vfio_pci_vf_token_user_add(struct vfio_pci_core_device *vdev, int val)
|
|
{
|
|
struct vfio_pci_core_device *pf_vdev = get_pf_vdev(vdev);
|
|
|
|
if (!pf_vdev)
|
|
return;
|
|
|
|
mutex_lock(&pf_vdev->vf_token->lock);
|
|
pf_vdev->vf_token->users += val;
|
|
WARN_ON(pf_vdev->vf_token->users < 0);
|
|
mutex_unlock(&pf_vdev->vf_token->lock);
|
|
|
|
vfio_device_put(&pf_vdev->vdev);
|
|
}
|
|
|
|
void vfio_pci_core_close_device(struct vfio_device *core_vdev)
|
|
{
|
|
struct vfio_pci_core_device *vdev =
|
|
container_of(core_vdev, struct vfio_pci_core_device, vdev);
|
|
|
|
vfio_pci_vf_token_user_add(vdev, -1);
|
|
vfio_spapr_pci_eeh_release(vdev->pdev);
|
|
vfio_pci_core_disable(vdev);
|
|
|
|
mutex_lock(&vdev->igate);
|
|
if (vdev->err_trigger) {
|
|
eventfd_ctx_put(vdev->err_trigger);
|
|
vdev->err_trigger = NULL;
|
|
}
|
|
if (vdev->req_trigger) {
|
|
eventfd_ctx_put(vdev->req_trigger);
|
|
vdev->req_trigger = NULL;
|
|
}
|
|
mutex_unlock(&vdev->igate);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_close_device);
|
|
|
|
void vfio_pci_core_finish_enable(struct vfio_pci_core_device *vdev)
|
|
{
|
|
vfio_pci_probe_mmaps(vdev);
|
|
vfio_spapr_pci_eeh_open(vdev->pdev);
|
|
vfio_pci_vf_token_user_add(vdev, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_finish_enable);
|
|
|
|
static int vfio_pci_get_irq_count(struct vfio_pci_core_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_info {
|
|
int count;
|
|
struct vfio_group **groups;
|
|
};
|
|
|
|
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_core_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_core_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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_register_dev_region);
|
|
|
|
long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct vfio_pci_core_device *vdev =
|
|
container_of(core_vdev, struct vfio_pci_core_device, vdev);
|
|
unsigned long minsz;
|
|
|
|
if (cmd == VFIO_DEVICE_GET_INFO) {
|
|
struct vfio_device_info info;
|
|
struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
|
|
unsigned long capsz;
|
|
int ret;
|
|
|
|
minsz = offsetofend(struct vfio_device_info, num_irqs);
|
|
|
|
/* For backward compatibility, cannot require this */
|
|
capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
|
|
|
|
if (copy_from_user(&info, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
if (info.argsz < minsz)
|
|
return -EINVAL;
|
|
|
|
if (info.argsz >= capsz) {
|
|
minsz = capsz;
|
|
info.cap_offset = 0;
|
|
}
|
|
|
|
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;
|
|
|
|
ret = vfio_pci_info_zdev_add_caps(vdev, &caps);
|
|
if (ret && ret != -ENODEV) {
|
|
pci_warn(vdev->pdev, "Failed to setup zPCI info capabilities\n");
|
|
return ret;
|
|
}
|
|
|
|
if (caps.size) {
|
|
info.flags |= VFIO_DEVICE_FLAGS_CAPS;
|
|
if (info.argsz < sizeof(info) + caps.size) {
|
|
info.argsz = sizeof(info) + caps.size;
|
|
} 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_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 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().
|
|
*/
|
|
cmd = vfio_pci_memory_lock_and_enable(vdev);
|
|
io = pci_map_rom(pdev, &size);
|
|
if (io) {
|
|
info.flags = VFIO_REGION_INFO_FLAG_READ;
|
|
pci_unmap_rom(pdev, io);
|
|
} else {
|
|
info.size = 0;
|
|
}
|
|
vfio_pci_memory_unlock_and_restore(vdev, 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;
|
|
fallthrough;
|
|
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) {
|
|
int ret;
|
|
|
|
if (!vdev->reset_works)
|
|
return -EINVAL;
|
|
|
|
vfio_pci_zap_and_down_write_memory_lock(vdev);
|
|
ret = pci_try_reset_function(vdev->pdev);
|
|
up_write(&vdev->memory_lock);
|
|
|
|
return ret;
|
|
|
|
} 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_group **groups;
|
|
struct vfio_pci_group_info info;
|
|
bool slot = false;
|
|
int group_idx, 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 (group_idx = 0; group_idx < hdr.count; group_idx++) {
|
|
struct vfio_group *group;
|
|
struct fd f = fdget(group_fds[group_idx]);
|
|
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[group_idx] = group;
|
|
}
|
|
|
|
kfree(group_fds);
|
|
|
|
/* release reference to groups on error */
|
|
if (ret)
|
|
goto hot_reset_release;
|
|
|
|
info.count = hdr.count;
|
|
info.groups = groups;
|
|
|
|
ret = vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, &info);
|
|
|
|
hot_reset_release:
|
|
for (group_idx--; group_idx >= 0; group_idx--)
|
|
vfio_group_put_external_user(groups[group_idx]);
|
|
|
|
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);
|
|
} else if (cmd == VFIO_DEVICE_FEATURE) {
|
|
struct vfio_device_feature feature;
|
|
uuid_t uuid;
|
|
|
|
minsz = offsetofend(struct vfio_device_feature, flags);
|
|
|
|
if (copy_from_user(&feature, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
if (feature.argsz < minsz)
|
|
return -EINVAL;
|
|
|
|
/* Check unknown flags */
|
|
if (feature.flags & ~(VFIO_DEVICE_FEATURE_MASK |
|
|
VFIO_DEVICE_FEATURE_SET |
|
|
VFIO_DEVICE_FEATURE_GET |
|
|
VFIO_DEVICE_FEATURE_PROBE))
|
|
return -EINVAL;
|
|
|
|
/* GET & SET are mutually exclusive except with PROBE */
|
|
if (!(feature.flags & VFIO_DEVICE_FEATURE_PROBE) &&
|
|
(feature.flags & VFIO_DEVICE_FEATURE_SET) &&
|
|
(feature.flags & VFIO_DEVICE_FEATURE_GET))
|
|
return -EINVAL;
|
|
|
|
switch (feature.flags & VFIO_DEVICE_FEATURE_MASK) {
|
|
case VFIO_DEVICE_FEATURE_PCI_VF_TOKEN:
|
|
if (!vdev->vf_token)
|
|
return -ENOTTY;
|
|
|
|
/*
|
|
* We do not support GET of the VF Token UUID as this
|
|
* could expose the token of the previous device user.
|
|
*/
|
|
if (feature.flags & VFIO_DEVICE_FEATURE_GET)
|
|
return -EINVAL;
|
|
|
|
if (feature.flags & VFIO_DEVICE_FEATURE_PROBE)
|
|
return 0;
|
|
|
|
/* Don't SET unless told to do so */
|
|
if (!(feature.flags & VFIO_DEVICE_FEATURE_SET))
|
|
return -EINVAL;
|
|
|
|
if (feature.argsz < minsz + sizeof(uuid))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&uuid, (void __user *)(arg + minsz),
|
|
sizeof(uuid)))
|
|
return -EFAULT;
|
|
|
|
mutex_lock(&vdev->vf_token->lock);
|
|
uuid_copy(&vdev->vf_token->uuid, &uuid);
|
|
mutex_unlock(&vdev->vf_token->lock);
|
|
|
|
return 0;
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
return -ENOTTY;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_ioctl);
|
|
|
|
static ssize_t vfio_pci_rw(struct vfio_pci_core_device *vdev, char __user *buf,
|
|
size_t count, loff_t *ppos, bool iswrite)
|
|
{
|
|
unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
|
|
|
|
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_core_read(struct vfio_device *core_vdev, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct vfio_pci_core_device *vdev =
|
|
container_of(core_vdev, struct vfio_pci_core_device, vdev);
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
return vfio_pci_rw(vdev, buf, count, ppos, false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_read);
|
|
|
|
ssize_t vfio_pci_core_write(struct vfio_device *core_vdev, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct vfio_pci_core_device *vdev =
|
|
container_of(core_vdev, struct vfio_pci_core_device, vdev);
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
return vfio_pci_rw(vdev, (char __user *)buf, count, ppos, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_write);
|
|
|
|
/* Return 1 on zap and vma_lock acquired, 0 on contention (only with @try) */
|
|
static int vfio_pci_zap_and_vma_lock(struct vfio_pci_core_device *vdev, bool try)
|
|
{
|
|
struct vfio_pci_mmap_vma *mmap_vma, *tmp;
|
|
|
|
/*
|
|
* Lock ordering:
|
|
* vma_lock is nested under mmap_lock for vm_ops callback paths.
|
|
* The memory_lock semaphore is used by both code paths calling
|
|
* into this function to zap vmas and the vm_ops.fault callback
|
|
* to protect the memory enable state of the device.
|
|
*
|
|
* When zapping vmas we need to maintain the mmap_lock => vma_lock
|
|
* ordering, which requires using vma_lock to walk vma_list to
|
|
* acquire an mm, then dropping vma_lock to get the mmap_lock and
|
|
* reacquiring vma_lock. This logic is derived from similar
|
|
* requirements in uverbs_user_mmap_disassociate().
|
|
*
|
|
* mmap_lock must always be the top-level lock when it is taken.
|
|
* Therefore we can only hold the memory_lock write lock when
|
|
* vma_list is empty, as we'd need to take mmap_lock to clear
|
|
* entries. vma_list can only be guaranteed empty when holding
|
|
* vma_lock, thus memory_lock is nested under vma_lock.
|
|
*
|
|
* This enables the vm_ops.fault callback to acquire vma_lock,
|
|
* followed by memory_lock read lock, while already holding
|
|
* mmap_lock without risk of deadlock.
|
|
*/
|
|
while (1) {
|
|
struct mm_struct *mm = NULL;
|
|
|
|
if (try) {
|
|
if (!mutex_trylock(&vdev->vma_lock))
|
|
return 0;
|
|
} else {
|
|
mutex_lock(&vdev->vma_lock);
|
|
}
|
|
while (!list_empty(&vdev->vma_list)) {
|
|
mmap_vma = list_first_entry(&vdev->vma_list,
|
|
struct vfio_pci_mmap_vma,
|
|
vma_next);
|
|
mm = mmap_vma->vma->vm_mm;
|
|
if (mmget_not_zero(mm))
|
|
break;
|
|
|
|
list_del(&mmap_vma->vma_next);
|
|
kfree(mmap_vma);
|
|
mm = NULL;
|
|
}
|
|
if (!mm)
|
|
return 1;
|
|
mutex_unlock(&vdev->vma_lock);
|
|
|
|
if (try) {
|
|
if (!mmap_read_trylock(mm)) {
|
|
mmput(mm);
|
|
return 0;
|
|
}
|
|
} else {
|
|
mmap_read_lock(mm);
|
|
}
|
|
if (try) {
|
|
if (!mutex_trylock(&vdev->vma_lock)) {
|
|
mmap_read_unlock(mm);
|
|
mmput(mm);
|
|
return 0;
|
|
}
|
|
} else {
|
|
mutex_lock(&vdev->vma_lock);
|
|
}
|
|
list_for_each_entry_safe(mmap_vma, tmp,
|
|
&vdev->vma_list, vma_next) {
|
|
struct vm_area_struct *vma = mmap_vma->vma;
|
|
|
|
if (vma->vm_mm != mm)
|
|
continue;
|
|
|
|
list_del(&mmap_vma->vma_next);
|
|
kfree(mmap_vma);
|
|
|
|
zap_vma_ptes(vma, vma->vm_start,
|
|
vma->vm_end - vma->vm_start);
|
|
}
|
|
mutex_unlock(&vdev->vma_lock);
|
|
mmap_read_unlock(mm);
|
|
mmput(mm);
|
|
}
|
|
}
|
|
|
|
void vfio_pci_zap_and_down_write_memory_lock(struct vfio_pci_core_device *vdev)
|
|
{
|
|
vfio_pci_zap_and_vma_lock(vdev, false);
|
|
down_write(&vdev->memory_lock);
|
|
mutex_unlock(&vdev->vma_lock);
|
|
}
|
|
|
|
u16 vfio_pci_memory_lock_and_enable(struct vfio_pci_core_device *vdev)
|
|
{
|
|
u16 cmd;
|
|
|
|
down_write(&vdev->memory_lock);
|
|
pci_read_config_word(vdev->pdev, PCI_COMMAND, &cmd);
|
|
if (!(cmd & PCI_COMMAND_MEMORY))
|
|
pci_write_config_word(vdev->pdev, PCI_COMMAND,
|
|
cmd | PCI_COMMAND_MEMORY);
|
|
|
|
return cmd;
|
|
}
|
|
|
|
void vfio_pci_memory_unlock_and_restore(struct vfio_pci_core_device *vdev, u16 cmd)
|
|
{
|
|
pci_write_config_word(vdev->pdev, PCI_COMMAND, cmd);
|
|
up_write(&vdev->memory_lock);
|
|
}
|
|
|
|
/* Caller holds vma_lock */
|
|
static int __vfio_pci_add_vma(struct vfio_pci_core_device *vdev,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct vfio_pci_mmap_vma *mmap_vma;
|
|
|
|
mmap_vma = kmalloc(sizeof(*mmap_vma), GFP_KERNEL);
|
|
if (!mmap_vma)
|
|
return -ENOMEM;
|
|
|
|
mmap_vma->vma = vma;
|
|
list_add(&mmap_vma->vma_next, &vdev->vma_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Zap mmaps on open so that we can fault them in on access and therefore
|
|
* our vma_list only tracks mappings accessed since last zap.
|
|
*/
|
|
static void vfio_pci_mmap_open(struct vm_area_struct *vma)
|
|
{
|
|
zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
|
|
}
|
|
|
|
static void vfio_pci_mmap_close(struct vm_area_struct *vma)
|
|
{
|
|
struct vfio_pci_core_device *vdev = vma->vm_private_data;
|
|
struct vfio_pci_mmap_vma *mmap_vma;
|
|
|
|
mutex_lock(&vdev->vma_lock);
|
|
list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
|
|
if (mmap_vma->vma == vma) {
|
|
list_del(&mmap_vma->vma_next);
|
|
kfree(mmap_vma);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&vdev->vma_lock);
|
|
}
|
|
|
|
static vm_fault_t vfio_pci_mmap_fault(struct vm_fault *vmf)
|
|
{
|
|
struct vm_area_struct *vma = vmf->vma;
|
|
struct vfio_pci_core_device *vdev = vma->vm_private_data;
|
|
struct vfio_pci_mmap_vma *mmap_vma;
|
|
vm_fault_t ret = VM_FAULT_NOPAGE;
|
|
|
|
mutex_lock(&vdev->vma_lock);
|
|
down_read(&vdev->memory_lock);
|
|
|
|
if (!__vfio_pci_memory_enabled(vdev)) {
|
|
ret = VM_FAULT_SIGBUS;
|
|
goto up_out;
|
|
}
|
|
|
|
/*
|
|
* We populate the whole vma on fault, so we need to test whether
|
|
* the vma has already been mapped, such as for concurrent faults
|
|
* to the same vma. io_remap_pfn_range() will trigger a BUG_ON if
|
|
* we ask it to fill the same range again.
|
|
*/
|
|
list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
|
|
if (mmap_vma->vma == vma)
|
|
goto up_out;
|
|
}
|
|
|
|
if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot)) {
|
|
ret = VM_FAULT_SIGBUS;
|
|
zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
|
|
goto up_out;
|
|
}
|
|
|
|
if (__vfio_pci_add_vma(vdev, vma)) {
|
|
ret = VM_FAULT_OOM;
|
|
zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
|
|
}
|
|
|
|
up_out:
|
|
up_read(&vdev->memory_lock);
|
|
mutex_unlock(&vdev->vma_lock);
|
|
return ret;
|
|
}
|
|
|
|
static const struct vm_operations_struct vfio_pci_mmap_ops = {
|
|
.open = vfio_pci_mmap_open,
|
|
.close = vfio_pci_mmap_close,
|
|
.fault = vfio_pci_mmap_fault,
|
|
};
|
|
|
|
int vfio_pci_core_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
|
|
{
|
|
struct vfio_pci_core_device *vdev =
|
|
container_of(core_vdev, struct vfio_pci_core_device, vdev);
|
|
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 (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
|
|
return -EINVAL;
|
|
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->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;
|
|
|
|
/*
|
|
* See remap_pfn_range(), called from vfio_pci_fault() but we can't
|
|
* change vm_flags within the fault handler. Set them now.
|
|
*/
|
|
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_ops = &vfio_pci_mmap_ops;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_mmap);
|
|
|
|
void vfio_pci_core_request(struct vfio_device *core_vdev, unsigned int count)
|
|
{
|
|
struct vfio_pci_core_device *vdev =
|
|
container_of(core_vdev, struct vfio_pci_core_device, vdev);
|
|
struct pci_dev *pdev = vdev->pdev;
|
|
|
|
mutex_lock(&vdev->igate);
|
|
|
|
if (vdev->req_trigger) {
|
|
if (!(count % 10))
|
|
pci_notice_ratelimited(pdev,
|
|
"Relaying device request to user (#%u)\n",
|
|
count);
|
|
eventfd_signal(vdev->req_trigger, 1);
|
|
} else if (count == 0) {
|
|
pci_warn(pdev,
|
|
"No device request channel registered, blocked until released by user\n");
|
|
}
|
|
|
|
mutex_unlock(&vdev->igate);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_request);
|
|
|
|
static int vfio_pci_validate_vf_token(struct vfio_pci_core_device *vdev,
|
|
bool vf_token, uuid_t *uuid)
|
|
{
|
|
/*
|
|
* There's always some degree of trust or collaboration between SR-IOV
|
|
* PF and VFs, even if just that the PF hosts the SR-IOV capability and
|
|
* can disrupt VFs with a reset, but often the PF has more explicit
|
|
* access to deny service to the VF or access data passed through the
|
|
* VF. We therefore require an opt-in via a shared VF token (UUID) to
|
|
* represent this trust. This both prevents that a VF driver might
|
|
* assume the PF driver is a trusted, in-kernel driver, and also that
|
|
* a PF driver might be replaced with a rogue driver, unknown to in-use
|
|
* VF drivers.
|
|
*
|
|
* Therefore when presented with a VF, if the PF is a vfio device and
|
|
* it is bound to the vfio-pci driver, the user needs to provide a VF
|
|
* token to access the device, in the form of appending a vf_token to
|
|
* the device name, for example:
|
|
*
|
|
* "0000:04:10.0 vf_token=bd8d9d2b-5a5f-4f5a-a211-f591514ba1f3"
|
|
*
|
|
* When presented with a PF which has VFs in use, the user must also
|
|
* provide the current VF token to prove collaboration with existing
|
|
* VF users. If VFs are not in use, the VF token provided for the PF
|
|
* device will act to set the VF token.
|
|
*
|
|
* If the VF token is provided but unused, an error is generated.
|
|
*/
|
|
if (!vdev->pdev->is_virtfn && !vdev->vf_token && !vf_token)
|
|
return 0; /* No VF token provided or required */
|
|
|
|
if (vdev->pdev->is_virtfn) {
|
|
struct vfio_pci_core_device *pf_vdev = get_pf_vdev(vdev);
|
|
bool match;
|
|
|
|
if (!pf_vdev) {
|
|
if (!vf_token)
|
|
return 0; /* PF is not vfio-pci, no VF token */
|
|
|
|
pci_info_ratelimited(vdev->pdev,
|
|
"VF token incorrectly provided, PF not bound to vfio-pci\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!vf_token) {
|
|
vfio_device_put(&pf_vdev->vdev);
|
|
pci_info_ratelimited(vdev->pdev,
|
|
"VF token required to access device\n");
|
|
return -EACCES;
|
|
}
|
|
|
|
mutex_lock(&pf_vdev->vf_token->lock);
|
|
match = uuid_equal(uuid, &pf_vdev->vf_token->uuid);
|
|
mutex_unlock(&pf_vdev->vf_token->lock);
|
|
|
|
vfio_device_put(&pf_vdev->vdev);
|
|
|
|
if (!match) {
|
|
pci_info_ratelimited(vdev->pdev,
|
|
"Incorrect VF token provided for device\n");
|
|
return -EACCES;
|
|
}
|
|
} else if (vdev->vf_token) {
|
|
mutex_lock(&vdev->vf_token->lock);
|
|
if (vdev->vf_token->users) {
|
|
if (!vf_token) {
|
|
mutex_unlock(&vdev->vf_token->lock);
|
|
pci_info_ratelimited(vdev->pdev,
|
|
"VF token required to access device\n");
|
|
return -EACCES;
|
|
}
|
|
|
|
if (!uuid_equal(uuid, &vdev->vf_token->uuid)) {
|
|
mutex_unlock(&vdev->vf_token->lock);
|
|
pci_info_ratelimited(vdev->pdev,
|
|
"Incorrect VF token provided for device\n");
|
|
return -EACCES;
|
|
}
|
|
} else if (vf_token) {
|
|
uuid_copy(&vdev->vf_token->uuid, uuid);
|
|
}
|
|
|
|
mutex_unlock(&vdev->vf_token->lock);
|
|
} else if (vf_token) {
|
|
pci_info_ratelimited(vdev->pdev,
|
|
"VF token incorrectly provided, not a PF or VF\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define VF_TOKEN_ARG "vf_token="
|
|
|
|
int vfio_pci_core_match(struct vfio_device *core_vdev, char *buf)
|
|
{
|
|
struct vfio_pci_core_device *vdev =
|
|
container_of(core_vdev, struct vfio_pci_core_device, vdev);
|
|
bool vf_token = false;
|
|
uuid_t uuid;
|
|
int ret;
|
|
|
|
if (strncmp(pci_name(vdev->pdev), buf, strlen(pci_name(vdev->pdev))))
|
|
return 0; /* No match */
|
|
|
|
if (strlen(buf) > strlen(pci_name(vdev->pdev))) {
|
|
buf += strlen(pci_name(vdev->pdev));
|
|
|
|
if (*buf != ' ')
|
|
return 0; /* No match: non-whitespace after name */
|
|
|
|
while (*buf) {
|
|
if (*buf == ' ') {
|
|
buf++;
|
|
continue;
|
|
}
|
|
|
|
if (!vf_token && !strncmp(buf, VF_TOKEN_ARG,
|
|
strlen(VF_TOKEN_ARG))) {
|
|
buf += strlen(VF_TOKEN_ARG);
|
|
|
|
if (strlen(buf) < UUID_STRING_LEN)
|
|
return -EINVAL;
|
|
|
|
ret = uuid_parse(buf, &uuid);
|
|
if (ret)
|
|
return ret;
|
|
|
|
vf_token = true;
|
|
buf += UUID_STRING_LEN;
|
|
} else {
|
|
/* Unknown/duplicate option */
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
ret = vfio_pci_validate_vf_token(vdev, vf_token, &uuid);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 1; /* Match */
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_match);
|
|
|
|
static int vfio_pci_bus_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct vfio_pci_core_device *vdev = container_of(nb,
|
|
struct vfio_pci_core_device, nb);
|
|
struct device *dev = data;
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct pci_dev *physfn = pci_physfn(pdev);
|
|
|
|
if (action == BUS_NOTIFY_ADD_DEVICE &&
|
|
pdev->is_virtfn && physfn == vdev->pdev) {
|
|
pci_info(vdev->pdev, "Captured SR-IOV VF %s driver_override\n",
|
|
pci_name(pdev));
|
|
pdev->driver_override = kasprintf(GFP_KERNEL, "%s",
|
|
vdev->vdev.ops->name);
|
|
} else if (action == BUS_NOTIFY_BOUND_DRIVER &&
|
|
pdev->is_virtfn && physfn == vdev->pdev) {
|
|
struct pci_driver *drv = pci_dev_driver(pdev);
|
|
|
|
if (drv && drv != pci_dev_driver(vdev->pdev))
|
|
pci_warn(vdev->pdev,
|
|
"VF %s bound to driver %s while PF bound to driver %s\n",
|
|
pci_name(pdev), drv->name,
|
|
pci_dev_driver(vdev->pdev)->name);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_pci_vf_init(struct vfio_pci_core_device *vdev)
|
|
{
|
|
struct pci_dev *pdev = vdev->pdev;
|
|
int ret;
|
|
|
|
if (!pdev->is_physfn)
|
|
return 0;
|
|
|
|
vdev->vf_token = kzalloc(sizeof(*vdev->vf_token), GFP_KERNEL);
|
|
if (!vdev->vf_token)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&vdev->vf_token->lock);
|
|
uuid_gen(&vdev->vf_token->uuid);
|
|
|
|
vdev->nb.notifier_call = vfio_pci_bus_notifier;
|
|
ret = bus_register_notifier(&pci_bus_type, &vdev->nb);
|
|
if (ret) {
|
|
kfree(vdev->vf_token);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void vfio_pci_vf_uninit(struct vfio_pci_core_device *vdev)
|
|
{
|
|
if (!vdev->vf_token)
|
|
return;
|
|
|
|
bus_unregister_notifier(&pci_bus_type, &vdev->nb);
|
|
WARN_ON(vdev->vf_token->users);
|
|
mutex_destroy(&vdev->vf_token->lock);
|
|
kfree(vdev->vf_token);
|
|
}
|
|
|
|
static int vfio_pci_vga_init(struct vfio_pci_core_device *vdev)
|
|
{
|
|
struct pci_dev *pdev = vdev->pdev;
|
|
int ret;
|
|
|
|
if (!vfio_pci_is_vga(pdev))
|
|
return 0;
|
|
|
|
ret = vga_client_register(pdev, vfio_pci_set_decode);
|
|
if (ret)
|
|
return ret;
|
|
vga_set_legacy_decoding(pdev, vfio_pci_set_decode(pdev, false));
|
|
return 0;
|
|
}
|
|
|
|
static void vfio_pci_vga_uninit(struct vfio_pci_core_device *vdev)
|
|
{
|
|
struct pci_dev *pdev = vdev->pdev;
|
|
|
|
if (!vfio_pci_is_vga(pdev))
|
|
return;
|
|
vga_client_unregister(pdev);
|
|
vga_set_legacy_decoding(pdev, VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
|
|
VGA_RSRC_LEGACY_IO |
|
|
VGA_RSRC_LEGACY_MEM);
|
|
}
|
|
|
|
void vfio_pci_core_init_device(struct vfio_pci_core_device *vdev,
|
|
struct pci_dev *pdev,
|
|
const struct vfio_device_ops *vfio_pci_ops)
|
|
{
|
|
vfio_init_group_dev(&vdev->vdev, &pdev->dev, vfio_pci_ops);
|
|
vdev->pdev = pdev;
|
|
vdev->irq_type = VFIO_PCI_NUM_IRQS;
|
|
mutex_init(&vdev->igate);
|
|
spin_lock_init(&vdev->irqlock);
|
|
mutex_init(&vdev->ioeventfds_lock);
|
|
INIT_LIST_HEAD(&vdev->dummy_resources_list);
|
|
INIT_LIST_HEAD(&vdev->ioeventfds_list);
|
|
mutex_init(&vdev->vma_lock);
|
|
INIT_LIST_HEAD(&vdev->vma_list);
|
|
init_rwsem(&vdev->memory_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_init_device);
|
|
|
|
void vfio_pci_core_uninit_device(struct vfio_pci_core_device *vdev)
|
|
{
|
|
mutex_destroy(&vdev->igate);
|
|
mutex_destroy(&vdev->ioeventfds_lock);
|
|
mutex_destroy(&vdev->vma_lock);
|
|
vfio_uninit_group_dev(&vdev->vdev);
|
|
kfree(vdev->region);
|
|
kfree(vdev->pm_save);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_uninit_device);
|
|
|
|
int vfio_pci_core_register_device(struct vfio_pci_core_device *vdev)
|
|
{
|
|
struct pci_dev *pdev = vdev->pdev;
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Prevent binding to PFs with VFs enabled, the VFs might be in use
|
|
* by the host or other users. We cannot capture the VFs if they
|
|
* already exist, nor can we track VF users. Disabling SR-IOV here
|
|
* would initiate removing the VFs, which would unbind the driver,
|
|
* which is prone to blocking if that VF is also in use by vfio-pci.
|
|
* Just reject these PFs and let the user sort it out.
|
|
*/
|
|
if (pci_num_vf(pdev)) {
|
|
pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
group = vfio_iommu_group_get(&pdev->dev);
|
|
if (!group)
|
|
return -EINVAL;
|
|
|
|
if (pci_is_root_bus(pdev->bus)) {
|
|
ret = vfio_assign_device_set(&vdev->vdev, vdev);
|
|
} else if (!pci_probe_reset_slot(pdev->slot)) {
|
|
ret = vfio_assign_device_set(&vdev->vdev, pdev->slot);
|
|
} else {
|
|
/*
|
|
* If there is no slot reset support for this device, the whole
|
|
* bus needs to be grouped together to support bus-wide resets.
|
|
*/
|
|
ret = vfio_assign_device_set(&vdev->vdev, pdev->bus);
|
|
}
|
|
|
|
if (ret)
|
|
goto out_group_put;
|
|
ret = vfio_pci_vf_init(vdev);
|
|
if (ret)
|
|
goto out_group_put;
|
|
ret = vfio_pci_vga_init(vdev);
|
|
if (ret)
|
|
goto out_vf;
|
|
|
|
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);
|
|
}
|
|
|
|
ret = vfio_register_group_dev(&vdev->vdev);
|
|
if (ret)
|
|
goto out_power;
|
|
return 0;
|
|
|
|
out_power:
|
|
if (!disable_idle_d3)
|
|
vfio_pci_set_power_state(vdev, PCI_D0);
|
|
out_vf:
|
|
vfio_pci_vf_uninit(vdev);
|
|
out_group_put:
|
|
vfio_iommu_group_put(group, &pdev->dev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_register_device);
|
|
|
|
void vfio_pci_core_unregister_device(struct vfio_pci_core_device *vdev)
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{
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struct pci_dev *pdev = vdev->pdev;
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pci_disable_sriov(pdev);
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vfio_unregister_group_dev(&vdev->vdev);
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vfio_pci_vf_uninit(vdev);
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vfio_pci_vga_uninit(vdev);
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vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev);
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if (!disable_idle_d3)
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vfio_pci_set_power_state(vdev, PCI_D0);
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}
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EXPORT_SYMBOL_GPL(vfio_pci_core_unregister_device);
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static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
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pci_channel_state_t state)
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{
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struct vfio_pci_core_device *vdev;
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struct vfio_device *device;
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device = vfio_device_get_from_dev(&pdev->dev);
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if (device == NULL)
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return PCI_ERS_RESULT_DISCONNECT;
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vdev = container_of(device, struct vfio_pci_core_device, vdev);
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mutex_lock(&vdev->igate);
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if (vdev->err_trigger)
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eventfd_signal(vdev->err_trigger, 1);
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mutex_unlock(&vdev->igate);
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vfio_device_put(device);
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return PCI_ERS_RESULT_CAN_RECOVER;
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}
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int vfio_pci_core_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
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{
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struct vfio_device *device;
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int ret = 0;
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device = vfio_device_get_from_dev(&pdev->dev);
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if (!device)
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return -ENODEV;
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if (nr_virtfn == 0)
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pci_disable_sriov(pdev);
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else
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ret = pci_enable_sriov(pdev, nr_virtfn);
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vfio_device_put(device);
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return ret < 0 ? ret : nr_virtfn;
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}
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EXPORT_SYMBOL_GPL(vfio_pci_core_sriov_configure);
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const struct pci_error_handlers vfio_pci_core_err_handlers = {
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.error_detected = vfio_pci_aer_err_detected,
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};
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EXPORT_SYMBOL_GPL(vfio_pci_core_err_handlers);
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static bool vfio_dev_in_groups(struct vfio_pci_core_device *vdev,
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struct vfio_pci_group_info *groups)
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{
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unsigned int i;
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for (i = 0; i < groups->count; i++)
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if (groups->groups[i] == vdev->vdev.group)
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return true;
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return false;
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}
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static int vfio_pci_is_device_in_set(struct pci_dev *pdev, void *data)
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{
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struct vfio_device_set *dev_set = data;
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struct vfio_device *cur;
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list_for_each_entry(cur, &dev_set->device_list, dev_set_list)
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if (cur->dev == &pdev->dev)
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return 0;
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return -EBUSY;
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}
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/*
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* vfio-core considers a group to be viable and will create a vfio_device even
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* if some devices are bound to drivers like pci-stub or pcieport. Here we
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* require all PCI devices to be inside our dev_set since that ensures they stay
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* put and that every driver controlling the device can co-ordinate with the
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* device reset.
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*
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* Returns the pci_dev to pass to pci_reset_bus() if every PCI device to be
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* reset is inside the dev_set, and pci_reset_bus() can succeed. NULL otherwise.
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*/
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static struct pci_dev *
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vfio_pci_dev_set_resettable(struct vfio_device_set *dev_set)
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{
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struct pci_dev *pdev;
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|
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lockdep_assert_held(&dev_set->lock);
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|
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/*
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* By definition all PCI devices in the dev_set share the same PCI
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* reset, so any pci_dev will have the same outcomes for
|
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* pci_probe_reset_*() and pci_reset_bus().
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*/
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pdev = list_first_entry(&dev_set->device_list,
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struct vfio_pci_core_device,
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vdev.dev_set_list)->pdev;
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|
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/* pci_reset_bus() is supported */
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if (pci_probe_reset_slot(pdev->slot) && pci_probe_reset_bus(pdev->bus))
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return NULL;
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if (vfio_pci_for_each_slot_or_bus(pdev, vfio_pci_is_device_in_set,
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dev_set,
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!pci_probe_reset_slot(pdev->slot)))
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return NULL;
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return pdev;
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}
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|
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/*
|
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* We need to get memory_lock for each device, but devices can share mmap_lock,
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* therefore we need to zap and hold the vma_lock for each device, and only then
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* get each memory_lock.
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*/
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static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
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struct vfio_pci_group_info *groups)
|
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{
|
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struct vfio_pci_core_device *cur_mem;
|
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struct vfio_pci_core_device *cur_vma;
|
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struct vfio_pci_core_device *cur;
|
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struct pci_dev *pdev;
|
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bool is_mem = true;
|
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int ret;
|
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|
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mutex_lock(&dev_set->lock);
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cur_mem = list_first_entry(&dev_set->device_list,
|
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struct vfio_pci_core_device,
|
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vdev.dev_set_list);
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pdev = vfio_pci_dev_set_resettable(dev_set);
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if (!pdev) {
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ret = -EINVAL;
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goto err_unlock;
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}
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list_for_each_entry(cur_vma, &dev_set->device_list, vdev.dev_set_list) {
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/*
|
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* Test whether all the affected devices are contained by the
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* set of groups provided by the user.
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*/
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if (!vfio_dev_in_groups(cur_vma, groups)) {
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ret = -EINVAL;
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goto err_undo;
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}
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/*
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* Locking multiple devices is prone to deadlock, runaway and
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* unwind if we hit contention.
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*/
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if (!vfio_pci_zap_and_vma_lock(cur_vma, true)) {
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ret = -EBUSY;
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goto err_undo;
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}
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}
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cur_vma = NULL;
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list_for_each_entry(cur_mem, &dev_set->device_list, vdev.dev_set_list) {
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if (!down_write_trylock(&cur_mem->memory_lock)) {
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ret = -EBUSY;
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goto err_undo;
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}
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mutex_unlock(&cur_mem->vma_lock);
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}
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cur_mem = NULL;
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ret = pci_reset_bus(pdev);
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err_undo:
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list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
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if (cur == cur_mem)
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is_mem = false;
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if (cur == cur_vma)
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break;
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if (is_mem)
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up_write(&cur->memory_lock);
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else
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mutex_unlock(&cur->vma_lock);
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}
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err_unlock:
|
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mutex_unlock(&dev_set->lock);
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return ret;
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}
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static bool vfio_pci_dev_set_needs_reset(struct vfio_device_set *dev_set)
|
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{
|
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struct vfio_pci_core_device *cur;
|
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bool needs_reset = false;
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|
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list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
|
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/* No VFIO device in the set can have an open device FD */
|
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if (cur->vdev.open_count)
|
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return false;
|
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needs_reset |= cur->needs_reset;
|
|
}
|
|
return needs_reset;
|
|
}
|
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|
|
/*
|
|
* If a bus or slot reset is available for the provided dev_set and:
|
|
* - All of the devices affected by that bus or slot reset are unused
|
|
* - 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.
|
|
* Returns true if the dev_set was reset.
|
|
*/
|
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static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set)
|
|
{
|
|
struct vfio_pci_core_device *cur;
|
|
struct pci_dev *pdev;
|
|
int ret;
|
|
|
|
if (!vfio_pci_dev_set_needs_reset(dev_set))
|
|
return false;
|
|
|
|
pdev = vfio_pci_dev_set_resettable(dev_set);
|
|
if (!pdev)
|
|
return false;
|
|
|
|
ret = pci_reset_bus(pdev);
|
|
if (ret)
|
|
return false;
|
|
|
|
list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
|
|
cur->needs_reset = false;
|
|
if (!disable_idle_d3)
|
|
vfio_pci_set_power_state(cur, PCI_D3hot);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void vfio_pci_core_set_params(bool is_nointxmask, bool is_disable_vga,
|
|
bool is_disable_idle_d3)
|
|
{
|
|
nointxmask = is_nointxmask;
|
|
disable_vga = is_disable_vga;
|
|
disable_idle_d3 = is_disable_idle_d3;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_pci_core_set_params);
|
|
|
|
static void vfio_pci_core_cleanup(void)
|
|
{
|
|
vfio_pci_uninit_perm_bits();
|
|
}
|
|
|
|
static int __init vfio_pci_core_init(void)
|
|
{
|
|
/* Allocate shared config space permission data used by all devices */
|
|
return vfio_pci_init_perm_bits();
|
|
}
|
|
|
|
module_init(vfio_pci_core_init);
|
|
module_exit(vfio_pci_core_cleanup);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|