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![Jan Beulich](/assets/img/avatar_default.png)
It's not helpful if every driver has to cook its own. Generalize xenbus'es INVALID_GRANT_HANDLE and pcifront's INVALID_GRANT_REF (which shouldn't have expanded to zero to begin with). Use the constants in p2m.c and gntdev.c right away, and update field types where necessary so they would match with the constants' types (albeit without touching struct ioctl_gntdev_grant_ref's ref field, as that's part of the public interface of the kernel and would require introducing a dependency on Xen's grant_table.h public header). Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/db7c38a5-0d75-d5d1-19de-e5fe9f0b9c48@suse.com Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
1182 lines
27 KiB
C
1182 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Xen PCI Frontend
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*
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* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <xen/xenbus.h>
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#include <xen/events.h>
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#include <xen/grant_table.h>
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#include <xen/page.h>
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#include <linux/spinlock.h>
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#include <linux/pci.h>
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#include <linux/msi.h>
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#include <xen/interface/io/pciif.h>
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#include <asm/xen/pci.h>
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#include <linux/interrupt.h>
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#include <linux/atomic.h>
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#include <linux/workqueue.h>
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#include <linux/bitops.h>
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#include <linux/time.h>
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#include <linux/ktime.h>
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#include <linux/swiotlb.h>
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#include <xen/platform_pci.h>
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#include <asm/xen/swiotlb-xen.h>
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#define INVALID_EVTCHN (-1)
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struct pci_bus_entry {
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struct list_head list;
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struct pci_bus *bus;
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};
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#define _PDEVB_op_active (0)
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#define PDEVB_op_active (1 << (_PDEVB_op_active))
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struct pcifront_device {
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struct xenbus_device *xdev;
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struct list_head root_buses;
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int evtchn;
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grant_ref_t gnt_ref;
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int irq;
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/* Lock this when doing any operations in sh_info */
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spinlock_t sh_info_lock;
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struct xen_pci_sharedinfo *sh_info;
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struct work_struct op_work;
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unsigned long flags;
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};
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struct pcifront_sd {
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struct pci_sysdata sd;
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struct pcifront_device *pdev;
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};
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static inline struct pcifront_device *
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pcifront_get_pdev(struct pcifront_sd *sd)
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{
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return sd->pdev;
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}
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static inline void pcifront_init_sd(struct pcifront_sd *sd,
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unsigned int domain, unsigned int bus,
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struct pcifront_device *pdev)
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{
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/* Because we do not expose that information via XenBus. */
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sd->sd.node = first_online_node;
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sd->sd.domain = domain;
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sd->pdev = pdev;
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}
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static DEFINE_SPINLOCK(pcifront_dev_lock);
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static struct pcifront_device *pcifront_dev;
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static int errno_to_pcibios_err(int errno)
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{
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switch (errno) {
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case XEN_PCI_ERR_success:
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return PCIBIOS_SUCCESSFUL;
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case XEN_PCI_ERR_dev_not_found:
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return PCIBIOS_DEVICE_NOT_FOUND;
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case XEN_PCI_ERR_invalid_offset:
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case XEN_PCI_ERR_op_failed:
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return PCIBIOS_BAD_REGISTER_NUMBER;
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case XEN_PCI_ERR_not_implemented:
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return PCIBIOS_FUNC_NOT_SUPPORTED;
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case XEN_PCI_ERR_access_denied:
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return PCIBIOS_SET_FAILED;
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}
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return errno;
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}
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static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev)
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{
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if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
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&& !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) {
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dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n");
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schedule_work(&pdev->op_work);
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}
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}
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static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
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{
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int err = 0;
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struct xen_pci_op *active_op = &pdev->sh_info->op;
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unsigned long irq_flags;
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evtchn_port_t port = pdev->evtchn;
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unsigned irq = pdev->irq;
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s64 ns, ns_timeout;
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spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
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memcpy(active_op, op, sizeof(struct xen_pci_op));
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/* Go */
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wmb();
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set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
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notify_remote_via_evtchn(port);
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/*
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* We set a poll timeout of 3 seconds but give up on return after
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* 2 seconds. It is better to time out too late rather than too early
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* (in the latter case we end up continually re-executing poll() with a
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* timeout in the past). 1s difference gives plenty of slack for error.
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*/
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ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC;
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xen_clear_irq_pending(irq);
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while (test_bit(_XEN_PCIF_active,
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(unsigned long *)&pdev->sh_info->flags)) {
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xen_poll_irq_timeout(irq, jiffies + 3*HZ);
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xen_clear_irq_pending(irq);
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ns = ktime_get_ns();
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if (ns > ns_timeout) {
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dev_err(&pdev->xdev->dev,
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"pciback not responding!!!\n");
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clear_bit(_XEN_PCIF_active,
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(unsigned long *)&pdev->sh_info->flags);
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err = XEN_PCI_ERR_dev_not_found;
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goto out;
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}
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}
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/*
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* We might lose backend service request since we
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* reuse same evtchn with pci_conf backend response. So re-schedule
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* aer pcifront service.
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*/
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if (test_bit(_XEN_PCIB_active,
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(unsigned long *)&pdev->sh_info->flags)) {
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dev_err(&pdev->xdev->dev,
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"schedule aer pcifront service\n");
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schedule_pcifront_aer_op(pdev);
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}
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memcpy(op, active_op, sizeof(struct xen_pci_op));
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err = op->err;
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out:
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spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags);
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return err;
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}
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/* Access to this function is spinlocked in drivers/pci/access.c */
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static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *val)
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{
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int err = 0;
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struct xen_pci_op op = {
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.cmd = XEN_PCI_OP_conf_read,
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.domain = pci_domain_nr(bus),
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.bus = bus->number,
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.devfn = devfn,
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.offset = where,
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.size = size,
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};
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struct pcifront_sd *sd = bus->sysdata;
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struct pcifront_device *pdev = pcifront_get_pdev(sd);
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dev_dbg(&pdev->xdev->dev,
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"read dev=%04x:%02x:%02x.%d - offset %x size %d\n",
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pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
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PCI_FUNC(devfn), where, size);
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err = do_pci_op(pdev, &op);
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if (likely(!err)) {
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dev_dbg(&pdev->xdev->dev, "read got back value %x\n",
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op.value);
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*val = op.value;
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} else if (err == -ENODEV) {
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/* No device here, pretend that it just returned 0 */
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err = 0;
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*val = 0;
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}
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return errno_to_pcibios_err(err);
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}
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/* Access to this function is spinlocked in drivers/pci/access.c */
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static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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struct xen_pci_op op = {
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.cmd = XEN_PCI_OP_conf_write,
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.domain = pci_domain_nr(bus),
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.bus = bus->number,
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.devfn = devfn,
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.offset = where,
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.size = size,
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.value = val,
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};
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struct pcifront_sd *sd = bus->sysdata;
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struct pcifront_device *pdev = pcifront_get_pdev(sd);
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dev_dbg(&pdev->xdev->dev,
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"write dev=%04x:%02x:%02x.%d - offset %x size %d val %x\n",
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pci_domain_nr(bus), bus->number,
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PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
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return errno_to_pcibios_err(do_pci_op(pdev, &op));
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}
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static struct pci_ops pcifront_bus_ops = {
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.read = pcifront_bus_read,
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.write = pcifront_bus_write,
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};
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#ifdef CONFIG_PCI_MSI
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static int pci_frontend_enable_msix(struct pci_dev *dev,
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int vector[], int nvec)
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{
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int err;
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int i;
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struct xen_pci_op op = {
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.cmd = XEN_PCI_OP_enable_msix,
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.domain = pci_domain_nr(dev->bus),
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.bus = dev->bus->number,
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.devfn = dev->devfn,
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.value = nvec,
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};
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struct pcifront_sd *sd = dev->bus->sysdata;
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struct pcifront_device *pdev = pcifront_get_pdev(sd);
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struct msi_desc *entry;
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if (nvec > SH_INFO_MAX_VEC) {
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pci_err(dev, "too many vectors (0x%x) for PCI frontend:"
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" Increase SH_INFO_MAX_VEC\n", nvec);
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return -EINVAL;
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}
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i = 0;
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for_each_pci_msi_entry(entry, dev) {
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op.msix_entries[i].entry = entry->msi_attrib.entry_nr;
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/* Vector is useless at this point. */
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op.msix_entries[i].vector = -1;
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i++;
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}
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err = do_pci_op(pdev, &op);
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if (likely(!err)) {
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if (likely(!op.value)) {
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/* we get the result */
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for (i = 0; i < nvec; i++) {
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if (op.msix_entries[i].vector <= 0) {
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pci_warn(dev, "MSI-X entry %d is invalid: %d!\n",
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i, op.msix_entries[i].vector);
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err = -EINVAL;
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vector[i] = -1;
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continue;
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}
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vector[i] = op.msix_entries[i].vector;
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}
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} else {
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pr_info("enable msix get value %x\n", op.value);
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err = op.value;
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}
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} else {
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pci_err(dev, "enable msix get err %x\n", err);
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}
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return err;
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}
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static void pci_frontend_disable_msix(struct pci_dev *dev)
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{
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int err;
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struct xen_pci_op op = {
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.cmd = XEN_PCI_OP_disable_msix,
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.domain = pci_domain_nr(dev->bus),
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.bus = dev->bus->number,
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.devfn = dev->devfn,
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};
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struct pcifront_sd *sd = dev->bus->sysdata;
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struct pcifront_device *pdev = pcifront_get_pdev(sd);
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err = do_pci_op(pdev, &op);
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/* What should do for error ? */
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if (err)
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pci_err(dev, "pci_disable_msix get err %x\n", err);
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}
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static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[])
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{
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int err;
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struct xen_pci_op op = {
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.cmd = XEN_PCI_OP_enable_msi,
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.domain = pci_domain_nr(dev->bus),
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.bus = dev->bus->number,
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.devfn = dev->devfn,
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};
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struct pcifront_sd *sd = dev->bus->sysdata;
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struct pcifront_device *pdev = pcifront_get_pdev(sd);
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err = do_pci_op(pdev, &op);
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if (likely(!err)) {
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vector[0] = op.value;
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if (op.value <= 0) {
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pci_warn(dev, "MSI entry is invalid: %d!\n",
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op.value);
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err = -EINVAL;
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vector[0] = -1;
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}
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} else {
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pci_err(dev, "pci frontend enable msi failed for dev "
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"%x:%x\n", op.bus, op.devfn);
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err = -EINVAL;
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}
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return err;
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}
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static void pci_frontend_disable_msi(struct pci_dev *dev)
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{
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int err;
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struct xen_pci_op op = {
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.cmd = XEN_PCI_OP_disable_msi,
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.domain = pci_domain_nr(dev->bus),
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.bus = dev->bus->number,
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.devfn = dev->devfn,
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};
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struct pcifront_sd *sd = dev->bus->sysdata;
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struct pcifront_device *pdev = pcifront_get_pdev(sd);
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err = do_pci_op(pdev, &op);
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if (err == XEN_PCI_ERR_dev_not_found) {
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/* XXX No response from backend, what shall we do? */
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pr_info("get no response from backend for disable MSI\n");
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return;
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}
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if (err)
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/* how can pciback notify us fail? */
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pr_info("get fake response from backend\n");
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}
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static struct xen_pci_frontend_ops pci_frontend_ops = {
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.enable_msi = pci_frontend_enable_msi,
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.disable_msi = pci_frontend_disable_msi,
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.enable_msix = pci_frontend_enable_msix,
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.disable_msix = pci_frontend_disable_msix,
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};
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static void pci_frontend_registrar(int enable)
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{
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if (enable)
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xen_pci_frontend = &pci_frontend_ops;
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else
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xen_pci_frontend = NULL;
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};
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#else
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static inline void pci_frontend_registrar(int enable) { };
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#endif /* CONFIG_PCI_MSI */
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/* Claim resources for the PCI frontend as-is, backend won't allow changes */
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static int pcifront_claim_resource(struct pci_dev *dev, void *data)
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{
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struct pcifront_device *pdev = data;
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int i;
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struct resource *r;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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r = &dev->resource[i];
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if (!r->parent && r->start && r->flags) {
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dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
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pci_name(dev), i);
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if (pci_claim_resource(dev, i)) {
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dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! "
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"Device offline. Try using e820_host=1 in the guest config.\n",
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pci_name(dev), i);
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}
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}
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}
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return 0;
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}
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|
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static int pcifront_scan_bus(struct pcifront_device *pdev,
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unsigned int domain, unsigned int bus,
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struct pci_bus *b)
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{
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struct pci_dev *d;
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unsigned int devfn;
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|
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/* Scan the bus for functions and add.
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* We omit handling of PCI bridge attachment because pciback prevents
|
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* bridges from being exported.
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*/
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for (devfn = 0; devfn < 0x100; devfn++) {
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d = pci_get_slot(b, devfn);
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if (d) {
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/* Device is already known. */
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pci_dev_put(d);
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continue;
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}
|
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|
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d = pci_scan_single_device(b, devfn);
|
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if (d)
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dev_info(&pdev->xdev->dev, "New device on "
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"%04x:%02x:%02x.%d found.\n", domain, bus,
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PCI_SLOT(devfn), PCI_FUNC(devfn));
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}
|
|
|
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return 0;
|
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}
|
|
|
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static int pcifront_scan_root(struct pcifront_device *pdev,
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unsigned int domain, unsigned int bus)
|
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{
|
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struct pci_bus *b;
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LIST_HEAD(resources);
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struct pcifront_sd *sd = NULL;
|
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struct pci_bus_entry *bus_entry = NULL;
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int err = 0;
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static struct resource busn_res = {
|
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.start = 0,
|
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.end = 255,
|
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.flags = IORESOURCE_BUS,
|
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};
|
|
|
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#ifndef CONFIG_PCI_DOMAINS
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if (domain != 0) {
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dev_err(&pdev->xdev->dev,
|
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"PCI Root in non-zero PCI Domain! domain=%d\n", domain);
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|
dev_err(&pdev->xdev->dev,
|
|
"Please compile with CONFIG_PCI_DOMAINS\n");
|
|
err = -EINVAL;
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|
goto err_out;
|
|
}
|
|
#endif
|
|
|
|
dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n",
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domain, bus);
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|
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bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL);
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sd = kzalloc(sizeof(*sd), GFP_KERNEL);
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if (!bus_entry || !sd) {
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err = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
pci_add_resource(&resources, &ioport_resource);
|
|
pci_add_resource(&resources, &iomem_resource);
|
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pci_add_resource(&resources, &busn_res);
|
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pcifront_init_sd(sd, domain, bus, pdev);
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|
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pci_lock_rescan_remove();
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|
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b = pci_scan_root_bus(&pdev->xdev->dev, bus,
|
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&pcifront_bus_ops, sd, &resources);
|
|
if (!b) {
|
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dev_err(&pdev->xdev->dev,
|
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"Error creating PCI Frontend Bus!\n");
|
|
err = -ENOMEM;
|
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pci_unlock_rescan_remove();
|
|
pci_free_resource_list(&resources);
|
|
goto err_out;
|
|
}
|
|
|
|
bus_entry->bus = b;
|
|
|
|
list_add(&bus_entry->list, &pdev->root_buses);
|
|
|
|
/* pci_scan_root_bus skips devices which do not have a
|
|
* devfn==0. The pcifront_scan_bus enumerates all devfn. */
|
|
err = pcifront_scan_bus(pdev, domain, bus, b);
|
|
|
|
/* Claim resources before going "live" with our devices */
|
|
pci_walk_bus(b, pcifront_claim_resource, pdev);
|
|
|
|
/* Create SysFS and notify udev of the devices. Aka: "going live" */
|
|
pci_bus_add_devices(b);
|
|
|
|
pci_unlock_rescan_remove();
|
|
return err;
|
|
|
|
err_out:
|
|
kfree(bus_entry);
|
|
kfree(sd);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pcifront_rescan_root(struct pcifront_device *pdev,
|
|
unsigned int domain, unsigned int bus)
|
|
{
|
|
int err;
|
|
struct pci_bus *b;
|
|
|
|
#ifndef CONFIG_PCI_DOMAINS
|
|
if (domain != 0) {
|
|
dev_err(&pdev->xdev->dev,
|
|
"PCI Root in non-zero PCI Domain! domain=%d\n", domain);
|
|
dev_err(&pdev->xdev->dev,
|
|
"Please compile with CONFIG_PCI_DOMAINS\n");
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n",
|
|
domain, bus);
|
|
|
|
b = pci_find_bus(domain, bus);
|
|
if (!b)
|
|
/* If the bus is unknown, create it. */
|
|
return pcifront_scan_root(pdev, domain, bus);
|
|
|
|
err = pcifront_scan_bus(pdev, domain, bus, b);
|
|
|
|
/* Claim resources before going "live" with our devices */
|
|
pci_walk_bus(b, pcifront_claim_resource, pdev);
|
|
|
|
/* Create SysFS and notify udev of the devices. Aka: "going live" */
|
|
pci_bus_add_devices(b);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void free_root_bus_devs(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
while (!list_empty(&bus->devices)) {
|
|
dev = container_of(bus->devices.next, struct pci_dev,
|
|
bus_list);
|
|
pci_dbg(dev, "removing device\n");
|
|
pci_stop_and_remove_bus_device(dev);
|
|
}
|
|
}
|
|
|
|
static void pcifront_free_roots(struct pcifront_device *pdev)
|
|
{
|
|
struct pci_bus_entry *bus_entry, *t;
|
|
|
|
dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n");
|
|
|
|
pci_lock_rescan_remove();
|
|
list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) {
|
|
list_del(&bus_entry->list);
|
|
|
|
free_root_bus_devs(bus_entry->bus);
|
|
|
|
kfree(bus_entry->bus->sysdata);
|
|
|
|
device_unregister(bus_entry->bus->bridge);
|
|
pci_remove_bus(bus_entry->bus);
|
|
|
|
kfree(bus_entry);
|
|
}
|
|
pci_unlock_rescan_remove();
|
|
}
|
|
|
|
static pci_ers_result_t pcifront_common_process(int cmd,
|
|
struct pcifront_device *pdev,
|
|
pci_channel_state_t state)
|
|
{
|
|
pci_ers_result_t result;
|
|
struct pci_driver *pdrv;
|
|
int bus = pdev->sh_info->aer_op.bus;
|
|
int devfn = pdev->sh_info->aer_op.devfn;
|
|
int domain = pdev->sh_info->aer_op.domain;
|
|
struct pci_dev *pcidev;
|
|
int flag = 0;
|
|
|
|
dev_dbg(&pdev->xdev->dev,
|
|
"pcifront AER process: cmd %x (bus:%x, devfn%x)",
|
|
cmd, bus, devfn);
|
|
result = PCI_ERS_RESULT_NONE;
|
|
|
|
pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
|
|
if (!pcidev || !pcidev->driver) {
|
|
dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
|
|
pci_dev_put(pcidev);
|
|
return result;
|
|
}
|
|
pdrv = pcidev->driver;
|
|
|
|
if (pdrv) {
|
|
if (pdrv->err_handler && pdrv->err_handler->error_detected) {
|
|
pci_dbg(pcidev, "trying to call AER service\n");
|
|
if (pcidev) {
|
|
flag = 1;
|
|
switch (cmd) {
|
|
case XEN_PCI_OP_aer_detected:
|
|
result = pdrv->err_handler->
|
|
error_detected(pcidev, state);
|
|
break;
|
|
case XEN_PCI_OP_aer_mmio:
|
|
result = pdrv->err_handler->
|
|
mmio_enabled(pcidev);
|
|
break;
|
|
case XEN_PCI_OP_aer_slotreset:
|
|
result = pdrv->err_handler->
|
|
slot_reset(pcidev);
|
|
break;
|
|
case XEN_PCI_OP_aer_resume:
|
|
pdrv->err_handler->resume(pcidev);
|
|
break;
|
|
default:
|
|
dev_err(&pdev->xdev->dev,
|
|
"bad request in aer recovery "
|
|
"operation!\n");
|
|
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (!flag)
|
|
result = PCI_ERS_RESULT_NONE;
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static void pcifront_do_aer(struct work_struct *data)
|
|
{
|
|
struct pcifront_device *pdev =
|
|
container_of(data, struct pcifront_device, op_work);
|
|
int cmd = pdev->sh_info->aer_op.cmd;
|
|
pci_channel_state_t state =
|
|
(pci_channel_state_t)pdev->sh_info->aer_op.err;
|
|
|
|
/*If a pci_conf op is in progress,
|
|
we have to wait until it is done before service aer op*/
|
|
dev_dbg(&pdev->xdev->dev,
|
|
"pcifront service aer bus %x devfn %x\n",
|
|
pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn);
|
|
|
|
pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state);
|
|
|
|
/* Post the operation to the guest. */
|
|
wmb();
|
|
clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags);
|
|
notify_remote_via_evtchn(pdev->evtchn);
|
|
|
|
/*in case of we lost an aer request in four lines time_window*/
|
|
smp_mb__before_atomic();
|
|
clear_bit(_PDEVB_op_active, &pdev->flags);
|
|
smp_mb__after_atomic();
|
|
|
|
schedule_pcifront_aer_op(pdev);
|
|
|
|
}
|
|
|
|
static irqreturn_t pcifront_handler_aer(int irq, void *dev)
|
|
{
|
|
struct pcifront_device *pdev = dev;
|
|
schedule_pcifront_aer_op(pdev);
|
|
return IRQ_HANDLED;
|
|
}
|
|
static int pcifront_connect_and_init_dma(struct pcifront_device *pdev)
|
|
{
|
|
int err = 0;
|
|
|
|
spin_lock(&pcifront_dev_lock);
|
|
|
|
if (!pcifront_dev) {
|
|
dev_info(&pdev->xdev->dev, "Installing PCI frontend\n");
|
|
pcifront_dev = pdev;
|
|
} else
|
|
err = -EEXIST;
|
|
|
|
spin_unlock(&pcifront_dev_lock);
|
|
|
|
if (!err && !swiotlb_nr_tbl()) {
|
|
err = pci_xen_swiotlb_init_late();
|
|
if (err)
|
|
dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n");
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void pcifront_disconnect(struct pcifront_device *pdev)
|
|
{
|
|
spin_lock(&pcifront_dev_lock);
|
|
|
|
if (pdev == pcifront_dev) {
|
|
dev_info(&pdev->xdev->dev,
|
|
"Disconnecting PCI Frontend Buses\n");
|
|
pcifront_dev = NULL;
|
|
}
|
|
|
|
spin_unlock(&pcifront_dev_lock);
|
|
}
|
|
static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev)
|
|
{
|
|
struct pcifront_device *pdev;
|
|
|
|
pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL);
|
|
if (pdev == NULL)
|
|
goto out;
|
|
|
|
pdev->sh_info =
|
|
(struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL);
|
|
if (pdev->sh_info == NULL) {
|
|
kfree(pdev);
|
|
pdev = NULL;
|
|
goto out;
|
|
}
|
|
pdev->sh_info->flags = 0;
|
|
|
|
/*Flag for registering PV AER handler*/
|
|
set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags);
|
|
|
|
dev_set_drvdata(&xdev->dev, pdev);
|
|
pdev->xdev = xdev;
|
|
|
|
INIT_LIST_HEAD(&pdev->root_buses);
|
|
|
|
spin_lock_init(&pdev->sh_info_lock);
|
|
|
|
pdev->evtchn = INVALID_EVTCHN;
|
|
pdev->gnt_ref = INVALID_GRANT_REF;
|
|
pdev->irq = -1;
|
|
|
|
INIT_WORK(&pdev->op_work, pcifront_do_aer);
|
|
|
|
dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n",
|
|
pdev, pdev->sh_info);
|
|
out:
|
|
return pdev;
|
|
}
|
|
|
|
static void free_pdev(struct pcifront_device *pdev)
|
|
{
|
|
dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev);
|
|
|
|
pcifront_free_roots(pdev);
|
|
|
|
cancel_work_sync(&pdev->op_work);
|
|
|
|
if (pdev->irq >= 0)
|
|
unbind_from_irqhandler(pdev->irq, pdev);
|
|
|
|
if (pdev->evtchn != INVALID_EVTCHN)
|
|
xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
|
|
|
|
if (pdev->gnt_ref != INVALID_GRANT_REF)
|
|
gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */,
|
|
(unsigned long)pdev->sh_info);
|
|
else
|
|
free_page((unsigned long)pdev->sh_info);
|
|
|
|
dev_set_drvdata(&pdev->xdev->dev, NULL);
|
|
|
|
kfree(pdev);
|
|
}
|
|
|
|
static int pcifront_publish_info(struct pcifront_device *pdev)
|
|
{
|
|
int err = 0;
|
|
struct xenbus_transaction trans;
|
|
grant_ref_t gref;
|
|
|
|
err = xenbus_grant_ring(pdev->xdev, pdev->sh_info, 1, &gref);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
pdev->gnt_ref = gref;
|
|
|
|
err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer,
|
|
0, "pcifront", pdev);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
pdev->irq = err;
|
|
|
|
do_publish:
|
|
err = xenbus_transaction_start(&trans);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error writing configuration for backend "
|
|
"(start transaction)");
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_printf(trans, pdev->xdev->nodename,
|
|
"pci-op-ref", "%u", pdev->gnt_ref);
|
|
if (!err)
|
|
err = xenbus_printf(trans, pdev->xdev->nodename,
|
|
"event-channel", "%u", pdev->evtchn);
|
|
if (!err)
|
|
err = xenbus_printf(trans, pdev->xdev->nodename,
|
|
"magic", XEN_PCI_MAGIC);
|
|
|
|
if (err) {
|
|
xenbus_transaction_end(trans, 1);
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error writing configuration for backend");
|
|
goto out;
|
|
} else {
|
|
err = xenbus_transaction_end(trans, 0);
|
|
if (err == -EAGAIN)
|
|
goto do_publish;
|
|
else if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error completing transaction "
|
|
"for backend");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
|
|
|
|
dev_dbg(&pdev->xdev->dev, "publishing successful!\n");
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int pcifront_try_connect(struct pcifront_device *pdev)
|
|
{
|
|
int err = -EFAULT;
|
|
int i, num_roots, len;
|
|
char str[64];
|
|
unsigned int domain, bus;
|
|
|
|
|
|
/* Only connect once */
|
|
if (xenbus_read_driver_state(pdev->xdev->nodename) !=
|
|
XenbusStateInitialised)
|
|
goto out;
|
|
|
|
err = pcifront_connect_and_init_dma(pdev);
|
|
if (err && err != -EEXIST) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error setting up PCI Frontend");
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
|
|
"root_num", "%d", &num_roots);
|
|
if (err == -ENOENT) {
|
|
xenbus_dev_error(pdev->xdev, err,
|
|
"No PCI Roots found, trying 0000:00");
|
|
err = pcifront_scan_root(pdev, 0, 0);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error scanning PCI root 0000:00");
|
|
goto out;
|
|
}
|
|
num_roots = 0;
|
|
} else if (err != 1) {
|
|
if (err == 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading number of PCI roots");
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < num_roots; i++) {
|
|
len = snprintf(str, sizeof(str), "root-%d", i);
|
|
if (unlikely(len >= (sizeof(str) - 1))) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
|
|
"%x:%x", &domain, &bus);
|
|
if (err != 2) {
|
|
if (err >= 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading PCI root %d", i);
|
|
goto out;
|
|
}
|
|
|
|
err = pcifront_scan_root(pdev, domain, bus);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error scanning PCI root %04x:%02x",
|
|
domain, bus);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
err = xenbus_switch_state(pdev->xdev, XenbusStateConnected);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int pcifront_try_disconnect(struct pcifront_device *pdev)
|
|
{
|
|
int err = 0;
|
|
enum xenbus_state prev_state;
|
|
|
|
|
|
prev_state = xenbus_read_driver_state(pdev->xdev->nodename);
|
|
|
|
if (prev_state >= XenbusStateClosing)
|
|
goto out;
|
|
|
|
if (prev_state == XenbusStateConnected) {
|
|
pcifront_free_roots(pdev);
|
|
pcifront_disconnect(pdev);
|
|
}
|
|
|
|
err = xenbus_switch_state(pdev->xdev, XenbusStateClosed);
|
|
|
|
out:
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pcifront_attach_devices(struct pcifront_device *pdev)
|
|
{
|
|
int err = -EFAULT;
|
|
int i, num_roots, len;
|
|
unsigned int domain, bus;
|
|
char str[64];
|
|
|
|
if (xenbus_read_driver_state(pdev->xdev->nodename) !=
|
|
XenbusStateReconfiguring)
|
|
goto out;
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
|
|
"root_num", "%d", &num_roots);
|
|
if (err == -ENOENT) {
|
|
xenbus_dev_error(pdev->xdev, err,
|
|
"No PCI Roots found, trying 0000:00");
|
|
err = pcifront_rescan_root(pdev, 0, 0);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error scanning PCI root 0000:00");
|
|
goto out;
|
|
}
|
|
num_roots = 0;
|
|
} else if (err != 1) {
|
|
if (err == 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading number of PCI roots");
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < num_roots; i++) {
|
|
len = snprintf(str, sizeof(str), "root-%d", i);
|
|
if (unlikely(len >= (sizeof(str) - 1))) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
|
|
"%x:%x", &domain, &bus);
|
|
if (err != 2) {
|
|
if (err >= 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading PCI root %d", i);
|
|
goto out;
|
|
}
|
|
|
|
err = pcifront_rescan_root(pdev, domain, bus);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error scanning PCI root %04x:%02x",
|
|
domain, bus);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
xenbus_switch_state(pdev->xdev, XenbusStateConnected);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int pcifront_detach_devices(struct pcifront_device *pdev)
|
|
{
|
|
int err = 0;
|
|
int i, num_devs;
|
|
unsigned int domain, bus, slot, func;
|
|
struct pci_dev *pci_dev;
|
|
char str[64];
|
|
|
|
if (xenbus_read_driver_state(pdev->xdev->nodename) !=
|
|
XenbusStateConnected)
|
|
goto out;
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d",
|
|
&num_devs);
|
|
if (err != 1) {
|
|
if (err >= 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading number of PCI devices");
|
|
goto out;
|
|
}
|
|
|
|
/* Find devices being detached and remove them. */
|
|
for (i = 0; i < num_devs; i++) {
|
|
int l, state;
|
|
l = snprintf(str, sizeof(str), "state-%d", i);
|
|
if (unlikely(l >= (sizeof(str) - 1))) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
state = xenbus_read_unsigned(pdev->xdev->otherend, str,
|
|
XenbusStateUnknown);
|
|
|
|
if (state != XenbusStateClosing)
|
|
continue;
|
|
|
|
/* Remove device. */
|
|
l = snprintf(str, sizeof(str), "vdev-%d", i);
|
|
if (unlikely(l >= (sizeof(str) - 1))) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
|
|
"%x:%x:%x.%x", &domain, &bus, &slot, &func);
|
|
if (err != 4) {
|
|
if (err >= 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading PCI device %d", i);
|
|
goto out;
|
|
}
|
|
|
|
pci_dev = pci_get_domain_bus_and_slot(domain, bus,
|
|
PCI_DEVFN(slot, func));
|
|
if (!pci_dev) {
|
|
dev_dbg(&pdev->xdev->dev,
|
|
"Cannot get PCI device %04x:%02x:%02x.%d\n",
|
|
domain, bus, slot, func);
|
|
continue;
|
|
}
|
|
pci_lock_rescan_remove();
|
|
pci_stop_and_remove_bus_device(pci_dev);
|
|
pci_dev_put(pci_dev);
|
|
pci_unlock_rescan_remove();
|
|
|
|
dev_dbg(&pdev->xdev->dev,
|
|
"PCI device %04x:%02x:%02x.%d removed.\n",
|
|
domain, bus, slot, func);
|
|
}
|
|
|
|
err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __ref pcifront_backend_changed(struct xenbus_device *xdev,
|
|
enum xenbus_state be_state)
|
|
{
|
|
struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
|
|
|
|
switch (be_state) {
|
|
case XenbusStateUnknown:
|
|
case XenbusStateInitialising:
|
|
case XenbusStateInitWait:
|
|
case XenbusStateInitialised:
|
|
break;
|
|
|
|
case XenbusStateConnected:
|
|
pcifront_try_connect(pdev);
|
|
break;
|
|
|
|
case XenbusStateClosed:
|
|
if (xdev->state == XenbusStateClosed)
|
|
break;
|
|
fallthrough; /* Missed the backend's CLOSING state */
|
|
case XenbusStateClosing:
|
|
dev_warn(&xdev->dev, "backend going away!\n");
|
|
pcifront_try_disconnect(pdev);
|
|
break;
|
|
|
|
case XenbusStateReconfiguring:
|
|
pcifront_detach_devices(pdev);
|
|
break;
|
|
|
|
case XenbusStateReconfigured:
|
|
pcifront_attach_devices(pdev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int pcifront_xenbus_probe(struct xenbus_device *xdev,
|
|
const struct xenbus_device_id *id)
|
|
{
|
|
int err = 0;
|
|
struct pcifront_device *pdev = alloc_pdev(xdev);
|
|
|
|
if (pdev == NULL) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(xdev, err,
|
|
"Error allocating pcifront_device struct");
|
|
goto out;
|
|
}
|
|
|
|
err = pcifront_publish_info(pdev);
|
|
if (err)
|
|
free_pdev(pdev);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int pcifront_xenbus_remove(struct xenbus_device *xdev)
|
|
{
|
|
struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
|
|
if (pdev)
|
|
free_pdev(pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct xenbus_device_id xenpci_ids[] = {
|
|
{"pci"},
|
|
{""},
|
|
};
|
|
|
|
static struct xenbus_driver xenpci_driver = {
|
|
.name = "pcifront",
|
|
.ids = xenpci_ids,
|
|
.probe = pcifront_xenbus_probe,
|
|
.remove = pcifront_xenbus_remove,
|
|
.otherend_changed = pcifront_backend_changed,
|
|
};
|
|
|
|
static int __init pcifront_init(void)
|
|
{
|
|
if (!xen_pv_domain() || xen_initial_domain())
|
|
return -ENODEV;
|
|
|
|
if (!xen_has_pv_devices())
|
|
return -ENODEV;
|
|
|
|
pci_frontend_registrar(1 /* enable */);
|
|
|
|
return xenbus_register_frontend(&xenpci_driver);
|
|
}
|
|
|
|
static void __exit pcifront_cleanup(void)
|
|
{
|
|
xenbus_unregister_driver(&xenpci_driver);
|
|
pci_frontend_registrar(0 /* disable */);
|
|
}
|
|
module_init(pcifront_init);
|
|
module_exit(pcifront_cleanup);
|
|
|
|
MODULE_DESCRIPTION("Xen PCI passthrough frontend.");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("xen:pci");
|