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* pci/spdx: PCI: Add SPDX GPL-2.0+ to replace implicit GPL v2 or later statement PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate PCI: Add SPDX GPL-2.0 to replace COPYING boilerplate PCI: Add SPDX GPL-2.0 to replace GPL v2 boilerplate PCI: Add SPDX GPL-2.0 when no license was specified
1189 lines
28 KiB
C
1189 lines
28 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 <xen/platform_pci.h>
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#include <asm/xen/swiotlb-xen.h>
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#define INVALID_GRANT_REF (0)
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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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int 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 verbose_request;
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module_param(verbose_request, int, 0644);
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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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if (verbose_request)
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dev_info(&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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if (verbose_request)
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dev_info(&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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if (verbose_request)
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dev_info(&pdev->xdev->dev,
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"write dev=%04x:%02x:%02x.%d - "
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"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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printk(KERN_DEBUG "enable msix get value %x\n",
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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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printk(KERN_DEBUG "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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printk(KERN_DEBUG "get fake response frombackend\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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|
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return 0;
|
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}
|
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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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|
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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,
|
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"Please compile with CONFIG_PCI_DOMAINS\n");
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err = -EINVAL;
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goto err_out;
|
|
}
|
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#endif
|
|
|
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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;
|
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goto err_out;
|
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}
|
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pci_add_resource(&resources, &ioport_resource);
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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);
|
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if (!b) {
|
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dev_err(&pdev->xdev->dev,
|
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"Error creating PCI Frontend Bus!\n");
|
|
err = -ENOMEM;
|
|
pci_unlock_rescan_remove();
|
|
pci_free_resource_list(&resources);
|
|
goto err_out;
|
|
}
|
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|
|
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;
|
|
/* Missed the backend's CLOSING state -- fallthrough */
|
|
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");
|