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
  21 struct 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
  31 struct 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
  44 struct 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 allow_interrupt_control:1;
  49         unsigned int warned_on_write:1;
  50         unsigned int enable_intx:1;
  51         unsigned int isr_on:1; /* Whether the IRQ handler is installed. */
  52         unsigned int ack_intr:1; /* .. and ACK-ing */
  53         unsigned long handled;
  54         unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */
  55         char irq_name[]; /* xen-pcibk[000:04:00.0] */
  56 };
  57
  58 /* Used by XenBus and xen_pcibk_ops.c */
  59 extern wait_queue_head_t xen_pcibk_aer_wait_queue;
  60 /* Used by pcistub.c and conf_space_quirks.c */
  61 extern struct list_head xen_pcibk_quirks;
  62
  63 /* Get/Put PCI Devices that are hidden from the PCI Backend Domain */
  64 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
  65                                             int domain, int bus,
  66                                             int slot, int func);
  67 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
  68                                     struct pci_dev *dev);
  69 void pcistub_put_pci_dev(struct pci_dev *dev);
  70
  71 /* Ensure a device is turned off or reset */
  72 void xen_pcibk_reset_device(struct pci_dev *pdev);
  73
  74 /* Access a virtual configuration space for a PCI device */
  75 int xen_pcibk_config_init(void);
  76 int xen_pcibk_config_init_dev(struct pci_dev *dev);
  77 void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev);
  78 void xen_pcibk_config_reset_dev(struct pci_dev *dev);
  79 void xen_pcibk_config_free_dev(struct pci_dev *dev);
  80 int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
  81                           u32 *ret_val);
  82 int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size,
  83                            u32 value);
  84
  85 /* Handle requests for specific devices from the frontend */
  86 typedef int (*publish_pci_dev_cb) (struct xen_pcibk_device *pdev,
  87                                    unsigned int domain, unsigned int bus,
  88                                    unsigned int devfn, unsigned int devid);
  89 typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev,
  90                                     unsigned int domain, unsigned int bus);
  91
  92 /* Backend registration for the two types of BDF representation:
  93  *  vpci - BDFs start at 00
  94  *  passthrough - BDFs are exactly like in the host.
  95  */
  96 struct xen_pcibk_backend {
  97         const char *name;
  98         int (*init)(struct xen_pcibk_device *pdev);
  99         void (*free)(struct xen_pcibk_device *pdev);
 100         int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev,
 101                     unsigned int *domain, unsigned int *bus,
 102                     unsigned int *devfn);
 103         int (*publish)(struct xen_pcibk_device *pdev, publish_pci_root_cb cb);
 104         void (*release)(struct xen_pcibk_device *pdev, struct pci_dev *dev,
 105                         bool lock);
 106         int (*add)(struct xen_pcibk_device *pdev, struct pci_dev *dev,
 107                    int devid, publish_pci_dev_cb publish_cb);
 108         struct pci_dev *(*get)(struct xen_pcibk_device *pdev,
 109                                unsigned int domain, unsigned int bus,
 110                                unsigned int devfn);
 111 };
 112
 113 extern const struct xen_pcibk_backend xen_pcibk_vpci_backend;
 114 extern const struct xen_pcibk_backend xen_pcibk_passthrough_backend;
 115 extern const struct xen_pcibk_backend *xen_pcibk_backend;
 116
 117 static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
 118                                         struct pci_dev *dev,
 119                                         int devid,
 120                                         publish_pci_dev_cb publish_cb)
 121 {
 122         if (xen_pcibk_backend && xen_pcibk_backend->add)
 123                 return xen_pcibk_backend->add(pdev, dev, devid, publish_cb);
 124         return -1;
 125 }
 126
 127 static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
 128                                              struct pci_dev *dev, bool lock)
 129 {
 130         if (xen_pcibk_backend && xen_pcibk_backend->release)
 131                 return xen_pcibk_backend->release(pdev, dev, lock);
 132 }
 133
 134 static inline struct pci_dev *
 135 xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain,
 136                       unsigned int bus, unsigned int devfn)
 137 {
 138         if (xen_pcibk_backend && xen_pcibk_backend->get)
 139                 return xen_pcibk_backend->get(pdev, domain, bus, devfn);
 140         return NULL;
 141 }
 142
 143 /**
 144 * Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk
 145 * before sending aer request to pcifront, so that guest could identify
 146 * device, coopearte with xen_pcibk to finish aer recovery job if device driver
 147 * has the capability
 148 */
 149 static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
 150                                              struct xen_pcibk_device *pdev,
 151                                              unsigned int *domain,
 152                                              unsigned int *bus,
 153                                              unsigned int *devfn)
 154 {
 155         if (xen_pcibk_backend && xen_pcibk_backend->find)
 156                 return xen_pcibk_backend->find(pcidev, pdev, domain, bus,
 157                                                devfn);
 158         return -1;
 159 }
 160
 161 static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
 162 {
 163         if (xen_pcibk_backend && xen_pcibk_backend->init)
 164                 return xen_pcibk_backend->init(pdev);
 165         return -1;
 166 }
 167
 168 static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
 169                                               publish_pci_root_cb cb)
 170 {
 171         if (xen_pcibk_backend && xen_pcibk_backend->publish)
 172                 return xen_pcibk_backend->publish(pdev, cb);
 173         return -1;
 174 }
 175
 176 static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
 177 {
 178         if (xen_pcibk_backend && xen_pcibk_backend->free)
 179                 return xen_pcibk_backend->free(pdev);
 180 }
 181
 182 /* Handles events from front-end */
 183 irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id);
 184 void xen_pcibk_do_op(struct work_struct *data);
 185
 186 int xen_pcibk_xenbus_register(void);
 187 void xen_pcibk_xenbus_unregister(void);
 188
 189 extern int verbose_request;
 190
 191 void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev);
 192 #endif
 193
 194 /* Handles shared IRQs that can to device domain and control domain. */
 195 void xen_pcibk_irq_handler(struct pci_dev *dev, int reset);