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/*
* PCI Backend Common Data Structures & Function Declarations
*
* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
*/
#ifndef __XEN_PCIBACK_H__
#define __XEN_PCIBACK_H__
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <xen/xenbus.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/atomic.h>
#include <xen/interface/io/pciif.h>
struct pci_dev_entry {
struct list_head list;
struct pci_dev *dev;
};
#define _PDEVF_op_active (0)
#define PDEVF_op_active (1<<(_PDEVF_op_active))
#define _PCIB_op_pending (1)
#define PCIB_op_pending (1<<(_PCIB_op_pending))
struct pciback_device {
void *pci_dev_data;
spinlock_t dev_lock;
struct xenbus_device *xdev;
struct xenbus_watch be_watch;
u8 be_watching;
int evtchn_irq;
struct xen_pci_sharedinfo *sh_info;
unsigned long flags;
struct work_struct op_work;
};
struct pciback_dev_data {
struct list_head config_fields;
unsigned int permissive:1;
unsigned int warned_on_write:1;
unsigned int enable_intx:1;
unsigned int isr_on:1; /* Whether the IRQ handler is installed. */
unsigned int ack_intr:1; /* .. and ACK-ing */
unsigned long handled;
unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */
char irq_name[0]; /* pciback[000:04:00.0] */
};
/* Used by XenBus and pciback_ops.c */
extern wait_queue_head_t aer_wait_queue;
extern struct workqueue_struct *pciback_wq;
/* Used by pcistub.c and conf_space_quirks.c */
extern struct list_head pciback_quirks;
/* Get/Put PCI Devices that are hidden from the PCI Backend Domain */
struct pci_dev *pcistub_get_pci_dev_by_slot(struct pciback_device *pdev,
int domain, int bus,
int slot, int func);
struct pci_dev *pcistub_get_pci_dev(struct pciback_device *pdev,
struct pci_dev *dev);
void pcistub_put_pci_dev(struct pci_dev *dev);
/* Ensure a device is turned off or reset */
void pciback_reset_device(struct pci_dev *pdev);
/* Access a virtual configuration space for a PCI device */
int pciback_config_init(void);
int pciback_config_init_dev(struct pci_dev *dev);
void pciback_config_free_dyn_fields(struct pci_dev *dev);
void pciback_config_reset_dev(struct pci_dev *dev);
void pciback_config_free_dev(struct pci_dev *dev);
int pciback_config_read(struct pci_dev *dev, int offset, int size,
u32 *ret_val);
int pciback_config_write(struct pci_dev *dev, int offset, int size, u32 value);
/* Handle requests for specific devices from the frontend */
typedef int (*publish_pci_dev_cb) (struct pciback_device *pdev,
unsigned int domain, unsigned int bus,
unsigned int devfn, unsigned int devid);
typedef int (*publish_pci_root_cb) (struct pciback_device *pdev,
unsigned int domain, unsigned int bus);
int pciback_add_pci_dev(struct pciback_device *pdev, struct pci_dev *dev,
int devid, publish_pci_dev_cb publish_cb);
void pciback_release_pci_dev(struct pciback_device *pdev, struct pci_dev *dev);
struct pci_dev *pciback_get_pci_dev(struct pciback_device *pdev,
unsigned int domain, unsigned int bus,
unsigned int devfn);
/**
* Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in pciback
* before sending aer request to pcifront, so that guest could identify
* device, coopearte with pciback to finish aer recovery job if device driver
* has the capability
*/
int pciback_get_pcifront_dev(struct pci_dev *pcidev,
struct pciback_device *pdev,
unsigned int *domain, unsigned int *bus,
unsigned int *devfn);
int pciback_init_devices(struct pciback_device *pdev);
int pciback_publish_pci_roots(struct pciback_device *pdev,
publish_pci_root_cb cb);
void pciback_release_devices(struct pciback_device *pdev);
/* Handles events from front-end */
irqreturn_t pciback_handle_event(int irq, void *dev_id);
void pciback_do_op(struct work_struct *data);
int pciback_xenbus_register(void);
void pciback_xenbus_unregister(void);
#ifdef CONFIG_PCI_MSI
int pciback_enable_msi(struct pciback_device *pdev,
struct pci_dev *dev, struct xen_pci_op *op);
int pciback_disable_msi(struct pciback_device *pdev,
struct pci_dev *dev, struct xen_pci_op *op);
int pciback_enable_msix(struct pciback_device *pdev,
struct pci_dev *dev, struct xen_pci_op *op);
int pciback_disable_msix(struct pciback_device *pdev,
struct pci_dev *dev, struct xen_pci_op *op);
#endif
extern int verbose_request;
void test_and_schedule_op(struct pciback_device *pdev);
#endif
/* Handles shared IRQs that can to device domain and control domain. */
void pciback_irq_handler(struct pci_dev *dev, int reset);
irqreturn_t pciback_guest_interrupt(int irq, void *dev_id);
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