drivers/xen/xen-pciback/pciback.h

   1 /*
   2  * PCI Backend Common Data Structures & Function Declarations
   3  *
   4  *   Author: Ryan Wilson <hap9@epoch.ncsc.mil>
   5  */
   6 #ifndef __XEN_PCIBACK_H__
   7 #define __XEN_PCIBACK_H__
   8
   9 #include <linux/pci.h>
  10 #include <linux/interrupt.h>
  11 #include <xen/xenbus.h>
  12 #include <linux/list.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/workqueue.h>
  15 #include <linux/atomic.h>
  16 #include <xen/interface/io/pciif.h>
  17
  18 struct pci_dev_entry {
  19         struct list_head list;
  20         struct pci_dev *dev;
  21 };
  22
  23 #define _PDEVF_op_active        (0)
  24 #define PDEVF_op_active         (1<<(_PDEVF_op_active))
  25 #define _PCIB_op_pending        (1)
  26 #define PCIB_op_pending         (1<<(_PCIB_op_pending))
  27
  28 struct pciback_device {
  29         void *pci_dev_data;
  30         spinlock_t dev_lock;
  31
  32         struct xenbus_device *xdev;
  33
  34         struct xenbus_watch be_watch;
  35         u8 be_watching;
  36
  37         int evtchn_irq;
  38
  39         struct xen_pci_sharedinfo *sh_info;
  40
  41         unsigned long flags;
  42
  43         struct work_struct op_work;
  44 };
  45
  46 struct pciback_dev_data {
  47         struct list_head config_fields;
  48         unsigned int permissive: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[0]; /* pciback[000:04:00.0] */
  56 };
  57
  58 /* Used by XenBus and pciback_ops.c */
  59 extern wait_queue_head_t aer_wait_queue;
  60 extern struct workqueue_struct *pciback_wq;
  61 /* Used by pcistub.c and conf_space_quirks.c */
  62 extern struct list_head pciback_quirks;
  63
  64 /* Get/Put PCI Devices that are hidden from the PCI Backend Domain */
  65 struct pci_dev *pcistub_get_pci_dev_by_slot(struct pciback_device *pdev,
  66                                             int domain, int bus,
  67                                             int slot, int func);
  68 struct pci_dev *pcistub_get_pci_dev(struct pciback_device *pdev,
  69                                     struct pci_dev *dev);
  70 void pcistub_put_pci_dev(struct pci_dev *dev);
  71
  72 /* Ensure a device is turned off or reset */
  73 void pciback_reset_device(struct pci_dev *pdev);
  74
  75 /* Access a virtual configuration space for a PCI device */
  76 int pciback_config_init(void);
  77 int pciback_config_init_dev(struct pci_dev *dev);
  78 void pciback_config_free_dyn_fields(struct pci_dev *dev);
  79 void pciback_config_reset_dev(struct pci_dev *dev);
  80 void pciback_config_free_dev(struct pci_dev *dev);
  81 int pciback_config_read(struct pci_dev *dev, int offset, int size,
  82                         u32 *ret_val);
  83 int pciback_config_write(struct pci_dev *dev, int offset, int size, u32 value);
  84
  85 /* Handle requests for specific devices from the frontend */
  86 typedef int (*publish_pci_dev_cb) (struct pciback_device *pdev,
  87                                    unsigned int domain, unsigned int bus,
  88                                    unsigned int devfn, unsigned int devid);
  89 typedef int (*publish_pci_root_cb) (struct pciback_device *pdev,
  90                                     unsigned int domain, unsigned int bus);
  91 int pciback_add_pci_dev(struct pciback_device *pdev, struct pci_dev *dev,
  92                         int devid, publish_pci_dev_cb publish_cb);
  93 void pciback_release_pci_dev(struct pciback_device *pdev, struct pci_dev *dev);
  94 struct pci_dev *pciback_get_pci_dev(struct pciback_device *pdev,
  95                                     unsigned int domain, unsigned int bus,
  96                                     unsigned int devfn);
  97
  98 /**
  99 * Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in pciback
 100 * before sending aer request to pcifront, so that guest could identify
 101 * device, coopearte with pciback to finish aer recovery job if device driver
 102 * has the capability
 103 */
 104
 105 int pciback_get_pcifront_dev(struct pci_dev *pcidev,
 106                              struct pciback_device *pdev,
 107                              unsigned int *domain, unsigned int *bus,
 108                              unsigned int *devfn);
 109 int pciback_init_devices(struct pciback_device *pdev);
 110 int pciback_publish_pci_roots(struct pciback_device *pdev,
 111                               publish_pci_root_cb cb);
 112 void pciback_release_devices(struct pciback_device *pdev);
 113
 114 /* Handles events from front-end */
 115 irqreturn_t pciback_handle_event(int irq, void *dev_id);
 116 void pciback_do_op(struct work_struct *data);
 117
 118 int pciback_xenbus_register(void);
 119 void pciback_xenbus_unregister(void);
 120
 121 #ifdef CONFIG_PCI_MSI
 122 int pciback_enable_msi(struct pciback_device *pdev,
 123                         struct pci_dev *dev, struct xen_pci_op *op);
 124
 125 int pciback_disable_msi(struct pciback_device *pdev,
 126                         struct pci_dev *dev, struct xen_pci_op *op);
 127
 128
 129 int pciback_enable_msix(struct pciback_device *pdev,
 130                         struct pci_dev *dev, struct xen_pci_op *op);
 131
 132 int pciback_disable_msix(struct pciback_device *pdev,
 133                         struct pci_dev *dev, struct xen_pci_op *op);
 134 #endif
 135 extern int verbose_request;
 136
 137 void test_and_schedule_op(struct pciback_device *pdev);
 138 #endif
 139
 140 /* Handles shared IRQs that can to device domain and control domain. */
 141 void pciback_irq_handler(struct pci_dev *dev, int reset);
 142 irqreturn_t pciback_guest_interrupt(int irq, void *dev_id);