linux/drivers/net/ethernet/intel/ice/ice_adapter.c

// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: Copyright Red Hat

#include <linux/bitfield.h>
#include <linux/cleanup.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/xarray.h>
#include "ice_adapter.h"

static DEFINE_XARRAY(ice_adapters);
static DEFINE_MUTEX(ice_adapters_mutex);

/* PCI bus number is 8 bits. Slot is 5 bits. Domain can have the rest. */
#define INDEX_FIELD_DOMAIN …
#define INDEX_FIELD_BUS …
#define INDEX_FIELD_SLOT …

static unsigned long ice_adapter_index(const struct pci_dev *pdev)
{ … }

static struct ice_adapter *ice_adapter_new(void)
{ … }

static void ice_adapter_free(struct ice_adapter *adapter)
{ … }

/**
 * ice_adapter_get - Get a shared ice_adapter structure.
 * @pdev: Pointer to the pci_dev whose driver is getting the ice_adapter.
 *
 * Gets a pointer to a shared ice_adapter structure. Physical functions (PFs)
 * of the same multi-function PCI device share one ice_adapter structure.
 * The ice_adapter is reference-counted. The PF driver must use ice_adapter_put
 * to release its reference.
 *
 * Context: Process, may sleep.
 * Return:  Pointer to ice_adapter on success.
 *          ERR_PTR() on error. -ENOMEM is the only possible error.
 */
struct ice_adapter *ice_adapter_get(const struct pci_dev *pdev)
{ … }

/**
 * ice_adapter_put - Release a reference to the shared ice_adapter structure.
 * @pdev: Pointer to the pci_dev whose driver is releasing the ice_adapter.
 *
 * Releases the reference to ice_adapter previously obtained with
 * ice_adapter_get.
 *
 * Context: Process, may sleep.
 */
void ice_adapter_put(const struct pci_dev *pdev)
{ … }