^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Xen PCI Frontend
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <xen/xenbus.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <xen/events.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <xen/grant_table.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <xen/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/msi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <xen/interface/io/pciif.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/xen/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/ktime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/swiotlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <xen/platform_pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/xen/swiotlb-xen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define INVALID_GRANT_REF (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define INVALID_EVTCHN (-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct pci_bus_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct pci_bus *bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define _PDEVB_op_active (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define PDEVB_op_active (1 << (_PDEVB_op_active))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct pcifront_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct xenbus_device *xdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct list_head root_buses;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int evtchn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) int gnt_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* Lock this when doing any operations in sh_info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) spinlock_t sh_info_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct xen_pci_sharedinfo *sh_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct work_struct op_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct pcifront_sd {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct pci_sysdata sd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct pcifront_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static inline struct pcifront_device *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) pcifront_get_pdev(struct pcifront_sd *sd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return sd->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static inline void pcifront_init_sd(struct pcifront_sd *sd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) unsigned int domain, unsigned int bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* Because we do not expose that information via XenBus. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) sd->sd.node = first_online_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) sd->sd.domain = domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) sd->pdev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static DEFINE_SPINLOCK(pcifront_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static struct pcifront_device *pcifront_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int errno_to_pcibios_err(int errno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) switch (errno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) case XEN_PCI_ERR_success:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return PCIBIOS_SUCCESSFUL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) case XEN_PCI_ERR_dev_not_found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return PCIBIOS_DEVICE_NOT_FOUND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) case XEN_PCI_ERR_invalid_offset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) case XEN_PCI_ERR_op_failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return PCIBIOS_BAD_REGISTER_NUMBER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) case XEN_PCI_ERR_not_implemented:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return PCIBIOS_FUNC_NOT_SUPPORTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) case XEN_PCI_ERR_access_denied:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return PCIBIOS_SET_FAILED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) schedule_work(&pdev->op_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct xen_pci_op *active_op = &pdev->sh_info->op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) unsigned long irq_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) evtchn_port_t port = pdev->evtchn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) unsigned irq = pdev->irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) s64 ns, ns_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) memcpy(active_op, op, sizeof(struct xen_pci_op));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* Go */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) notify_remote_via_evtchn(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * We set a poll timeout of 3 seconds but give up on return after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * 2 seconds. It is better to time out too late rather than too early
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * (in the latter case we end up continually re-executing poll() with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * timeout in the past). 1s difference gives plenty of slack for error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) xen_clear_irq_pending(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) while (test_bit(_XEN_PCIF_active,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) (unsigned long *)&pdev->sh_info->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) xen_poll_irq_timeout(irq, jiffies + 3*HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) xen_clear_irq_pending(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) ns = ktime_get_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (ns > ns_timeout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) dev_err(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) "pciback not responding!!!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) clear_bit(_XEN_PCIF_active,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) (unsigned long *)&pdev->sh_info->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) err = XEN_PCI_ERR_dev_not_found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * We might lose backend service request since we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * reuse same evtchn with pci_conf backend response. So re-schedule
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * aer pcifront service.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (test_bit(_XEN_PCIB_active,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) (unsigned long *)&pdev->sh_info->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) dev_err(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) "schedule aer pcifront service\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) schedule_pcifront_aer_op(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) memcpy(op, active_op, sizeof(struct xen_pci_op));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) err = op->err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* Access to this function is spinlocked in drivers/pci/access.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) int where, int size, u32 *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct xen_pci_op op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) .cmd = XEN_PCI_OP_conf_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) .domain = pci_domain_nr(bus),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) .bus = bus->number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) .devfn = devfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) .offset = where,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) .size = size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) struct pcifront_sd *sd = bus->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct pcifront_device *pdev = pcifront_get_pdev(sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) dev_dbg(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) "read dev=%04x:%02x:%02x.%d - offset %x size %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) PCI_FUNC(devfn), where, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) err = do_pci_op(pdev, &op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (likely(!err)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) dev_dbg(&pdev->xdev->dev, "read got back value %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) op.value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) *val = op.value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) } else if (err == -ENODEV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /* No device here, pretend that it just returned 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) *val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return errno_to_pcibios_err(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /* Access to this function is spinlocked in drivers/pci/access.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) int where, int size, u32 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) struct xen_pci_op op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) .cmd = XEN_PCI_OP_conf_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) .domain = pci_domain_nr(bus),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) .bus = bus->number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) .devfn = devfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) .offset = where,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) .size = size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) .value = val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct pcifront_sd *sd = bus->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct pcifront_device *pdev = pcifront_get_pdev(sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) dev_dbg(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) "write dev=%04x:%02x:%02x.%d - offset %x size %d val %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) pci_domain_nr(bus), bus->number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return errno_to_pcibios_err(do_pci_op(pdev, &op));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static struct pci_ops pcifront_bus_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) .read = pcifront_bus_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) .write = pcifront_bus_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) #ifdef CONFIG_PCI_MSI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static int pci_frontend_enable_msix(struct pci_dev *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) int vector[], int nvec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) struct xen_pci_op op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) .cmd = XEN_PCI_OP_enable_msix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) .domain = pci_domain_nr(dev->bus),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) .bus = dev->bus->number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) .devfn = dev->devfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) .value = nvec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct pcifront_sd *sd = dev->bus->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) struct pcifront_device *pdev = pcifront_get_pdev(sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct msi_desc *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (nvec > SH_INFO_MAX_VEC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) pci_err(dev, "too many vectors (0x%x) for PCI frontend:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) " Increase SH_INFO_MAX_VEC\n", nvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) for_each_pci_msi_entry(entry, dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) op.msix_entries[i].entry = entry->msi_attrib.entry_nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* Vector is useless at this point. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) op.msix_entries[i].vector = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) err = do_pci_op(pdev, &op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (likely(!err)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (likely(!op.value)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /* we get the result */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) for (i = 0; i < nvec; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (op.msix_entries[i].vector <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) pci_warn(dev, "MSI-X entry %d is invalid: %d!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) i, op.msix_entries[i].vector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) vector[i] = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) vector[i] = op.msix_entries[i].vector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) pr_info("enable msix get value %x\n", op.value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) err = op.value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) pci_err(dev, "enable msix get err %x\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static void pci_frontend_disable_msix(struct pci_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct xen_pci_op op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) .cmd = XEN_PCI_OP_disable_msix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) .domain = pci_domain_nr(dev->bus),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) .bus = dev->bus->number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) .devfn = dev->devfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct pcifront_sd *sd = dev->bus->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct pcifront_device *pdev = pcifront_get_pdev(sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) err = do_pci_op(pdev, &op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /* What should do for error ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) pci_err(dev, "pci_disable_msix get err %x\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) struct xen_pci_op op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) .cmd = XEN_PCI_OP_enable_msi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) .domain = pci_domain_nr(dev->bus),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) .bus = dev->bus->number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) .devfn = dev->devfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct pcifront_sd *sd = dev->bus->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct pcifront_device *pdev = pcifront_get_pdev(sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) err = do_pci_op(pdev, &op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (likely(!err)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) vector[0] = op.value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) if (op.value <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) pci_warn(dev, "MSI entry is invalid: %d!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) op.value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) vector[0] = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) pci_err(dev, "pci frontend enable msi failed for dev "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) "%x:%x\n", op.bus, op.devfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) static void pci_frontend_disable_msi(struct pci_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct xen_pci_op op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) .cmd = XEN_PCI_OP_disable_msi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) .domain = pci_domain_nr(dev->bus),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) .bus = dev->bus->number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) .devfn = dev->devfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) struct pcifront_sd *sd = dev->bus->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) struct pcifront_device *pdev = pcifront_get_pdev(sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) err = do_pci_op(pdev, &op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (err == XEN_PCI_ERR_dev_not_found) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) /* XXX No response from backend, what shall we do? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) pr_info("get no response from backend for disable MSI\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) /* how can pciback notify us fail? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) pr_info("get fake response from backend\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) static struct xen_pci_frontend_ops pci_frontend_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) .enable_msi = pci_frontend_enable_msi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) .disable_msi = pci_frontend_disable_msi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) .enable_msix = pci_frontend_enable_msix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) .disable_msix = pci_frontend_disable_msix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) static void pci_frontend_registrar(int enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) xen_pci_frontend = &pci_frontend_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) xen_pci_frontend = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) static inline void pci_frontend_registrar(int enable) { };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) #endif /* CONFIG_PCI_MSI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) /* Claim resources for the PCI frontend as-is, backend won't allow changes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) static int pcifront_claim_resource(struct pci_dev *dev, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct pcifront_device *pdev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) struct resource *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) for (i = 0; i < PCI_NUM_RESOURCES; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) r = &dev->resource[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (!r->parent && r->start && r->flags) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) pci_name(dev), i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (pci_claim_resource(dev, i)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) "Device offline. Try using e820_host=1 in the guest config.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) pci_name(dev), i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) static int pcifront_scan_bus(struct pcifront_device *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) unsigned int domain, unsigned int bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct pci_bus *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) struct pci_dev *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) unsigned int devfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /* Scan the bus for functions and add.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * We omit handling of PCI bridge attachment because pciback prevents
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * bridges from being exported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) for (devfn = 0; devfn < 0x100; devfn++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) d = pci_get_slot(b, devfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (d) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) /* Device is already known. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) pci_dev_put(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) d = pci_scan_single_device(b, devfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) dev_info(&pdev->xdev->dev, "New device on "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) "%04x:%02x:%02x.%d found.\n", domain, bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) PCI_SLOT(devfn), PCI_FUNC(devfn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) static int pcifront_scan_root(struct pcifront_device *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) unsigned int domain, unsigned int bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) struct pci_bus *b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) LIST_HEAD(resources);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) struct pcifront_sd *sd = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) struct pci_bus_entry *bus_entry = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) static struct resource busn_res = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) .start = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) .end = 255,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) .flags = IORESOURCE_BUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) #ifndef CONFIG_PCI_DOMAINS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) if (domain != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) dev_err(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) dev_err(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) "Please compile with CONFIG_PCI_DOMAINS\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) sd = kzalloc(sizeof(*sd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (!bus_entry || !sd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) pci_add_resource(&resources, &ioport_resource);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) pci_add_resource(&resources, &iomem_resource);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) pci_add_resource(&resources, &busn_res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) pcifront_init_sd(sd, domain, bus, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) pci_lock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) b = pci_scan_root_bus(&pdev->xdev->dev, bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) &pcifront_bus_ops, sd, &resources);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (!b) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) dev_err(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) "Error creating PCI Frontend Bus!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) pci_unlock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) pci_free_resource_list(&resources);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) bus_entry->bus = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) list_add(&bus_entry->list, &pdev->root_buses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) /* pci_scan_root_bus skips devices which do not have a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) * devfn==0. The pcifront_scan_bus enumerates all devfn. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) err = pcifront_scan_bus(pdev, domain, bus, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) /* Claim resources before going "live" with our devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) pci_walk_bus(b, pcifront_claim_resource, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) /* Create SysFS and notify udev of the devices. Aka: "going live" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) pci_bus_add_devices(b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) pci_unlock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) err_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) kfree(bus_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) kfree(sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) static int pcifront_rescan_root(struct pcifront_device *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) unsigned int domain, unsigned int bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) struct pci_bus *b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) #ifndef CONFIG_PCI_DOMAINS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) if (domain != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) dev_err(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) dev_err(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) "Please compile with CONFIG_PCI_DOMAINS\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) b = pci_find_bus(domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) if (!b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) /* If the bus is unknown, create it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) return pcifront_scan_root(pdev, domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) err = pcifront_scan_bus(pdev, domain, bus, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) /* Claim resources before going "live" with our devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) pci_walk_bus(b, pcifront_claim_resource, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) /* Create SysFS and notify udev of the devices. Aka: "going live" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) pci_bus_add_devices(b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) static void free_root_bus_devs(struct pci_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) struct pci_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) while (!list_empty(&bus->devices)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) dev = container_of(bus->devices.next, struct pci_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) bus_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) pci_dbg(dev, "removing device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) pci_stop_and_remove_bus_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) static void pcifront_free_roots(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) struct pci_bus_entry *bus_entry, *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) pci_lock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) list_del(&bus_entry->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) free_root_bus_devs(bus_entry->bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) kfree(bus_entry->bus->sysdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) device_unregister(bus_entry->bus->bridge);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) pci_remove_bus(bus_entry->bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) kfree(bus_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) pci_unlock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) static pci_ers_result_t pcifront_common_process(int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) struct pcifront_device *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) pci_channel_state_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) pci_ers_result_t result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) struct pci_driver *pdrv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) int bus = pdev->sh_info->aer_op.bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) int devfn = pdev->sh_info->aer_op.devfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) int domain = pdev->sh_info->aer_op.domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) struct pci_dev *pcidev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) int flag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) dev_dbg(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) "pcifront AER process: cmd %x (bus:%x, devfn%x)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) cmd, bus, devfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) result = PCI_ERS_RESULT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) if (!pcidev || !pcidev->driver) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) pci_dev_put(pcidev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) pdrv = pcidev->driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (pdrv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) if (pdrv->err_handler && pdrv->err_handler->error_detected) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) pci_dbg(pcidev, "trying to call AER service\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (pcidev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) flag = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) case XEN_PCI_OP_aer_detected:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) result = pdrv->err_handler->
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) error_detected(pcidev, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) case XEN_PCI_OP_aer_mmio:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) result = pdrv->err_handler->
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) mmio_enabled(pcidev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) case XEN_PCI_OP_aer_slotreset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) result = pdrv->err_handler->
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) slot_reset(pcidev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) case XEN_PCI_OP_aer_resume:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) pdrv->err_handler->resume(pcidev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) dev_err(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) "bad request in aer recovery "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) "operation!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (!flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) result = PCI_ERS_RESULT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) static void pcifront_do_aer(struct work_struct *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) struct pcifront_device *pdev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) container_of(data, struct pcifront_device, op_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) int cmd = pdev->sh_info->aer_op.cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) pci_channel_state_t state =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) (pci_channel_state_t)pdev->sh_info->aer_op.err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) /*If a pci_conf op is in progress,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) we have to wait until it is done before service aer op*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) dev_dbg(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) "pcifront service aer bus %x devfn %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) /* Post the operation to the guest. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) notify_remote_via_evtchn(pdev->evtchn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) /*in case of we lost an aer request in four lines time_window*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) smp_mb__before_atomic();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) clear_bit(_PDEVB_op_active, &pdev->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) smp_mb__after_atomic();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) schedule_pcifront_aer_op(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) static irqreturn_t pcifront_handler_aer(int irq, void *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) struct pcifront_device *pdev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) schedule_pcifront_aer_op(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) static int pcifront_connect_and_init_dma(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) spin_lock(&pcifront_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) if (!pcifront_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) dev_info(&pdev->xdev->dev, "Installing PCI frontend\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) pcifront_dev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) err = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) spin_unlock(&pcifront_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) if (!err && !swiotlb_nr_tbl()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) err = pci_xen_swiotlb_init_late();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) static void pcifront_disconnect(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) spin_lock(&pcifront_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) if (pdev == pcifront_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) dev_info(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) "Disconnecting PCI Frontend Buses\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) pcifront_dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) spin_unlock(&pcifront_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) struct pcifront_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) if (pdev == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) pdev->sh_info =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) if (pdev->sh_info == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) kfree(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) pdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) pdev->sh_info->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) /*Flag for registering PV AER handler*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) dev_set_drvdata(&xdev->dev, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) pdev->xdev = xdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) INIT_LIST_HEAD(&pdev->root_buses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) spin_lock_init(&pdev->sh_info_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) pdev->evtchn = INVALID_EVTCHN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) pdev->gnt_ref = INVALID_GRANT_REF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) pdev->irq = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) INIT_WORK(&pdev->op_work, pcifront_do_aer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) pdev, pdev->sh_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) return pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) static void free_pdev(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) pcifront_free_roots(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) cancel_work_sync(&pdev->op_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) if (pdev->irq >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) unbind_from_irqhandler(pdev->irq, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (pdev->evtchn != INVALID_EVTCHN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) if (pdev->gnt_ref != INVALID_GRANT_REF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) (unsigned long)pdev->sh_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) free_page((unsigned long)pdev->sh_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) dev_set_drvdata(&pdev->xdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) kfree(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) static int pcifront_publish_info(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) struct xenbus_transaction trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) grant_ref_t gref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) err = xenbus_grant_ring(pdev->xdev, pdev->sh_info, 1, &gref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) pdev->gnt_ref = gref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) 0, "pcifront", pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) pdev->irq = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) do_publish:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) err = xenbus_transaction_start(&trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) "Error writing configuration for backend "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) "(start transaction)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) err = xenbus_printf(trans, pdev->xdev->nodename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) "pci-op-ref", "%u", pdev->gnt_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) err = xenbus_printf(trans, pdev->xdev->nodename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) "event-channel", "%u", pdev->evtchn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) err = xenbus_printf(trans, pdev->xdev->nodename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) "magic", XEN_PCI_MAGIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) xenbus_transaction_end(trans, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) "Error writing configuration for backend");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) err = xenbus_transaction_end(trans, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) if (err == -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) goto do_publish;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) else if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) "Error completing transaction "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) "for backend");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) dev_dbg(&pdev->xdev->dev, "publishing successful!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) static int pcifront_try_connect(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) int err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) int i, num_roots, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) char str[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) unsigned int domain, bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) /* Only connect once */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) if (xenbus_read_driver_state(pdev->xdev->nodename) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) XenbusStateInitialised)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) err = pcifront_connect_and_init_dma(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) if (err && err != -EEXIST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) "Error setting up PCI Frontend");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) "root_num", "%d", &num_roots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) if (err == -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) xenbus_dev_error(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) "No PCI Roots found, trying 0000:00");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) err = pcifront_scan_root(pdev, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) "Error scanning PCI root 0000:00");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) num_roots = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) } else if (err != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) if (err == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) "Error reading number of PCI roots");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) for (i = 0; i < num_roots; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) len = snprintf(str, sizeof(str), "root-%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) if (unlikely(len >= (sizeof(str) - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) "%x:%x", &domain, &bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) if (err != 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) if (err >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) "Error reading PCI root %d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) err = pcifront_scan_root(pdev, domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) "Error scanning PCI root %04x:%02x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) err = xenbus_switch_state(pdev->xdev, XenbusStateConnected);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) static int pcifront_try_disconnect(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) enum xenbus_state prev_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) prev_state = xenbus_read_driver_state(pdev->xdev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) if (prev_state >= XenbusStateClosing)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) if (prev_state == XenbusStateConnected) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) pcifront_free_roots(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) pcifront_disconnect(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) err = xenbus_switch_state(pdev->xdev, XenbusStateClosed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) static int pcifront_attach_devices(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) int err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) int i, num_roots, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) unsigned int domain, bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) char str[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) if (xenbus_read_driver_state(pdev->xdev->nodename) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) XenbusStateReconfiguring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) "root_num", "%d", &num_roots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) if (err == -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) xenbus_dev_error(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) "No PCI Roots found, trying 0000:00");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) err = pcifront_rescan_root(pdev, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) "Error scanning PCI root 0000:00");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) num_roots = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) } else if (err != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) if (err == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) "Error reading number of PCI roots");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) for (i = 0; i < num_roots; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) len = snprintf(str, sizeof(str), "root-%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) if (unlikely(len >= (sizeof(str) - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) "%x:%x", &domain, &bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) if (err != 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) if (err >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) "Error reading PCI root %d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) err = pcifront_rescan_root(pdev, domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) "Error scanning PCI root %04x:%02x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) xenbus_switch_state(pdev->xdev, XenbusStateConnected);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) static int pcifront_detach_devices(struct pcifront_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) int i, num_devs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) unsigned int domain, bus, slot, func;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) struct pci_dev *pci_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) char str[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) if (xenbus_read_driver_state(pdev->xdev->nodename) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) XenbusStateConnected)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) &num_devs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) if (err != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) if (err >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) "Error reading number of PCI devices");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) /* Find devices being detached and remove them. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) for (i = 0; i < num_devs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) int l, state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) l = snprintf(str, sizeof(str), "state-%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) if (unlikely(l >= (sizeof(str) - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) state = xenbus_read_unsigned(pdev->xdev->otherend, str,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) XenbusStateUnknown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) if (state != XenbusStateClosing)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) /* Remove device. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) l = snprintf(str, sizeof(str), "vdev-%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) if (unlikely(l >= (sizeof(str) - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) "%x:%x:%x.%x", &domain, &bus, &slot, &func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) if (err != 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) if (err >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) xenbus_dev_fatal(pdev->xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) "Error reading PCI device %d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) pci_dev = pci_get_domain_bus_and_slot(domain, bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) PCI_DEVFN(slot, func));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) if (!pci_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) dev_dbg(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) "Cannot get PCI device %04x:%02x:%02x.%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) domain, bus, slot, func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) pci_lock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) pci_stop_and_remove_bus_device(pci_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) pci_dev_put(pci_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) pci_unlock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) dev_dbg(&pdev->xdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) "PCI device %04x:%02x:%02x.%d removed.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) domain, bus, slot, func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) static void __ref pcifront_backend_changed(struct xenbus_device *xdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) enum xenbus_state be_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) switch (be_state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) case XenbusStateUnknown:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) case XenbusStateInitialising:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) case XenbusStateInitWait:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) case XenbusStateInitialised:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) case XenbusStateConnected:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) pcifront_try_connect(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) case XenbusStateClosed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) if (xdev->state == XenbusStateClosed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) fallthrough; /* Missed the backend's CLOSING state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) case XenbusStateClosing:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) dev_warn(&xdev->dev, "backend going away!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) pcifront_try_disconnect(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) case XenbusStateReconfiguring:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) pcifront_detach_devices(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) case XenbusStateReconfigured:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) pcifront_attach_devices(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) static int pcifront_xenbus_probe(struct xenbus_device *xdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) const struct xenbus_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) struct pcifront_device *pdev = alloc_pdev(xdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) if (pdev == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) xenbus_dev_fatal(xdev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) "Error allocating pcifront_device struct");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) err = pcifront_publish_info(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) free_pdev(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) static int pcifront_xenbus_remove(struct xenbus_device *xdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) if (pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) free_pdev(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) static const struct xenbus_device_id xenpci_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) {"pci"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) {""},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) static struct xenbus_driver xenpci_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) .name = "pcifront",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) .ids = xenpci_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) .probe = pcifront_xenbus_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) .remove = pcifront_xenbus_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) .otherend_changed = pcifront_backend_changed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) static int __init pcifront_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) if (!xen_pv_domain() || xen_initial_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) if (!xen_has_pv_devices())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) pci_frontend_registrar(1 /* enable */);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) return xenbus_register_frontend(&xenpci_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) static void __exit pcifront_cleanup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) xenbus_unregister_driver(&xenpci_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) pci_frontend_registrar(0 /* disable */);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) module_init(pcifront_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) module_exit(pcifront_cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) MODULE_DESCRIPTION("Xen PCI passthrough frontend.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) MODULE_ALIAS("xen:pci");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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