linux/drivers/char/agp/isoch.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Setup routines for AGP 3.5 compliant bridges.
 */

#include <linux/list.h>
#include <linux/pci.h>
#include <linux/agp_backend.h>
#include <linux/module.h>
#include <linux/slab.h>

#include "agp.h"

/* Generic AGP 3.5 enabling routines */

struct agp_3_5_dev { … };

static void agp_3_5_dev_list_insert(struct list_head *head, struct list_head *new)
{ … }

static void agp_3_5_dev_list_sort(struct agp_3_5_dev *list, unsigned int ndevs)
{ … }

/*
 * Initialize all isochronous transfer parameters for an AGP 3.0
 * node (i.e. a host bridge in combination with the adapters
 * lying behind it...)
 */

static int agp_3_5_isochronous_node_enable(struct agp_bridge_data *bridge,
		struct agp_3_5_dev *dev_list, unsigned int ndevs)
{ … }

/*
 * This function basically allocates request queue slots among the
 * AGP 3.0 systems in nonisochronous nodes.  The algorithm is
 * pretty stupid, divide the total number of RQ slots provided by the
 * target by ndevs.  Distribute this many slots to each AGP 3.0 device,
 * giving any left over slots to the last device in dev_list.
 */
static void agp_3_5_nonisochronous_node_enable(struct agp_bridge_data *bridge,
		struct agp_3_5_dev *dev_list, unsigned int ndevs)
{ … }

/*
 * Fully configure and enable an AGP 3.0 host bridge and all the devices
 * lying behind it.
 */
int agp_3_5_enable(struct agp_bridge_data *bridge)
{ … }