LXR linux/drivers/xen/xen-pciback/pciback.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * PCI Backend Common Data Structures & Function Declarations
   4 *
   5 *   Author: Ryan Wilson <hap9@epoch.ncsc.mil>
   6 */
   7#ifndef __XEN_PCIBACK_H__
   8#define __XEN_PCIBACK_H__
   9
  10#include <linux/pci.h>
  11#include <linux/interrupt.h>
  12#include <xen/xenbus.h>
  13#include <linux/list.h>
  14#include <linux/spinlock.h>
  15#include <linux/workqueue.h>
  16#include <linux/atomic.h>
  17#include <xen/interface/io/pciif.h>
  18
  19#define DRV_NAME        "xen-pciback"
  20
  21struct pci_dev_entry {
  22        struct list_head list;
  23        struct pci_dev *dev;
  24};
  25
  26#define _PDEVF_op_active        (0)
  27#define PDEVF_op_active         (1<<(_PDEVF_op_active))
  28#define _PCIB_op_pending        (1)
  29#define PCIB_op_pending         (1<<(_PCIB_op_pending))
  30
  31struct xen_pcibk_device {
  32        void *pci_dev_data;
  33        struct mutex dev_lock;
  34        struct xenbus_device *xdev;
  35        struct xenbus_watch be_watch;
  36        u8 be_watching;
  37        int evtchn_irq;
  38        struct xen_pci_sharedinfo *sh_info;
  39        unsigned long flags;
  40        struct work_struct op_work;
  41        struct xen_pci_op op;
  42};
  43
  44struct xen_pcibk_dev_data {
  45        struct list_head config_fields;
  46        struct pci_saved_state *pci_saved_state;
  47        unsigned int permissive:1;
  48        unsigned int warned_on_write:1;
  49        unsigned int enable_intx:1;
  50        unsigned int isr_on:1; /* Whether the IRQ handler is installed. */
  51        unsigned int ack_intr:1; /* .. and ACK-ing */
  52        unsigned long handled;
  53        unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */
  54        char irq_name[0]; /* xen-pcibk[000:04:00.0] */
  55};
  56
  57/* Used by XenBus and xen_pcibk_ops.c */
  58extern wait_queue_head_t xen_pcibk_aer_wait_queue;
  59/* Used by pcistub.c and conf_space_quirks.c */
  60extern struct list_head xen_pcibk_quirks;
  61
  62/* Get/Put PCI Devices that are hidden from the PCI Backend Domain */
  63struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
  64                                            int domain, int bus,
  65                                            int slot, int func);
  66struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
  67                                    struct pci_dev *dev);
  68void pcistub_put_pci_dev(struct pci_dev *dev);
  69
  70/* Ensure a device is turned off or reset */
  71void xen_pcibk_reset_device(struct pci_dev *pdev);
  72
  73/* Access a virtual configuration space for a PCI device */
  74int xen_pcibk_config_init(void);
  75int xen_pcibk_config_init_dev(struct pci_dev *dev);
  76void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev);
  77void xen_pcibk_config_reset_dev(struct pci_dev *dev);
  78void xen_pcibk_config_free_dev(struct pci_dev *dev);
  79int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
  80                          u32 *ret_val);
  81int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size,
  82                           u32 value);
  83
  84/* Handle requests for specific devices from the frontend */
  85typedef int (*publish_pci_dev_cb) (struct xen_pcibk_device *pdev,
  86                                   unsigned int domain, unsigned int bus,
  87                                   unsigned int devfn, unsigned int devid);
  88typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev,
  89                                    unsigned int domain, unsigned int bus);
  90
  91/* Backend registration for the two types of BDF representation:
  92 *  vpci - BDFs start at 00
  93 *  passthrough - BDFs are exactly like in the host.
  94 */
  95struct xen_pcibk_backend {
  96        const char *name;
  97        int (*init)(struct xen_pcibk_device *pdev);
  98        void (*free)(struct xen_pcibk_device *pdev);
  99        int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev,
 100                    unsigned int *domain, unsigned int *bus,
 101                    unsigned int *devfn);
 102        int (*publish)(struct xen_pcibk_device *pdev, publish_pci_root_cb cb);
 103        void (*release)(struct xen_pcibk_device *pdev, struct pci_dev *dev,
 104                        bool lock);
 105        int (*add)(struct xen_pcibk_device *pdev, struct pci_dev *dev,
 106                   int devid, publish_pci_dev_cb publish_cb);
 107        struct pci_dev *(*get)(struct xen_pcibk_device *pdev,
 108                               unsigned int domain, unsigned int bus,
 109                               unsigned int devfn);
 110};
 111
 112extern const struct xen_pcibk_backend xen_pcibk_vpci_backend;
 113extern const struct xen_pcibk_backend xen_pcibk_passthrough_backend;
 114extern const struct xen_pcibk_backend *xen_pcibk_backend;
 115
 116static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
 117                                        struct pci_dev *dev,
 118                                        int devid,
 119                                        publish_pci_dev_cb publish_cb)
 120{
 121        if (xen_pcibk_backend && xen_pcibk_backend->add)
 122                return xen_pcibk_backend->add(pdev, dev, devid, publish_cb);
 123        return -1;
 124}
 125
 126static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
 127                                             struct pci_dev *dev, bool lock)
 128{
 129        if (xen_pcibk_backend && xen_pcibk_backend->release)
 130                return xen_pcibk_backend->release(pdev, dev, lock);
 131}
 132
 133static inline struct pci_dev *
 134xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain,
 135                      unsigned int bus, unsigned int devfn)
 136{
 137        if (xen_pcibk_backend && xen_pcibk_backend->get)
 138                return xen_pcibk_backend->get(pdev, domain, bus, devfn);
 139        return NULL;
 140}
 141
 142/**
 143* Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk
 144* before sending aer request to pcifront, so that guest could identify
 145* device, coopearte with xen_pcibk to finish aer recovery job if device driver
 146* has the capability
 147*/
 148static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
 149                                             struct xen_pcibk_device *pdev,
 150                                             unsigned int *domain,
 151                                             unsigned int *bus,
 152                                             unsigned int *devfn)
 153{
 154        if (xen_pcibk_backend && xen_pcibk_backend->find)
 155                return xen_pcibk_backend->find(pcidev, pdev, domain, bus,
 156                                               devfn);
 157        return -1;
 158}
 159
 160static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
 161{
 162        if (xen_pcibk_backend && xen_pcibk_backend->init)
 163                return xen_pcibk_backend->init(pdev);
 164        return -1;
 165}
 166
 167static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
 168                                              publish_pci_root_cb cb)
 169{
 170        if (xen_pcibk_backend && xen_pcibk_backend->publish)
 171                return xen_pcibk_backend->publish(pdev, cb);
 172        return -1;
 173}
 174
 175static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
 176{
 177        if (xen_pcibk_backend && xen_pcibk_backend->free)
 178                return xen_pcibk_backend->free(pdev);
 179}
 180
 181/* Handles events from front-end */
 182irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id);
 183void xen_pcibk_do_op(struct work_struct *data);
 184
 185int xen_pcibk_xenbus_register(void);
 186void xen_pcibk_xenbus_unregister(void);
 187
 188extern int verbose_request;
 189
 190void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev);
 191#endif
 192
 193/* Handles shared IRQs that can to device domain and control domain. */
 194void xen_pcibk_irq_handler(struct pci_dev *dev, int reset);
 195