linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Xen PCI Frontend

 *

 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/mm.h>

#include <xen/xenbus.h>

#include <xen/events.h>

#include <xen/grant_table.h>

#include <xen/page.h>

#include <linux/spinlock.h>

#include <linux/pci.h>

#include <linux/msi.h>

#include <xen/interface/io/pciif.h>

#include <asm/xen/pci.h>

#include <linux/interrupt.h>

#include <linux/atomic.h>

#include <linux/workqueue.h>

#include <linux/bitops.h>

#include <linux/time.h>

#include <linux/ktime.h>

#include <xen/platform_pci.h>

​

#include <asm/xen/swiotlb-xen.h>

#define INVALID_GRANT_REF (0)

#define INVALID_EVTCHN    (-1)

​

struct pci_bus_entry {

    struct list_head list;

    struct pci_bus *bus;

};

​

#define _PDEVB_op_active        (0)

#define PDEVB_op_active         (1 << (_PDEVB_op_active))

​

struct pcifront_device {

    struct xenbus_device *xdev;

    struct list_head root_buses;

​

    int evtchn;

    int gnt_ref;

​

    int irq;

​

    /* Lock this when doing any operations in sh_info */

    spinlock_t sh_info_lock;

    struct xen_pci_sharedinfo *sh_info;

    struct work_struct op_work;

    unsigned long flags;

​

};

​

struct pcifront_sd {

    struct pci_sysdata sd;

    struct pcifront_device *pdev;

};

​

static inline struct pcifront_device *

pcifront_get_pdev(struct pcifront_sd *sd)

{

    return sd->pdev;

}

​

static inline void pcifront_init_sd(struct pcifront_sd *sd,

                    unsigned int domain, unsigned int bus,

                    struct pcifront_device *pdev)

{

    /* Because we do not expose that information via XenBus. */

    sd->sd.node = first_online_node;

    sd->sd.domain = domain;

    sd->pdev = pdev;

}

​

static DEFINE_SPINLOCK(pcifront_dev_lock);

static struct pcifront_device *pcifront_dev;

​

static int verbose_request;

module_param(verbose_request, int, 0644);

​

static int errno_to_pcibios_err(int errno)

{

    switch (errno) {

    case XEN_PCI_ERR_success:

        return PCIBIOS_SUCCESSFUL;

​

    case XEN_PCI_ERR_dev_not_found:

        return PCIBIOS_DEVICE_NOT_FOUND;

​

    case XEN_PCI_ERR_invalid_offset: