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/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*   BSD LICENSE
 *
 *   Copyright 2013-2014 6WIND S.A.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of 6WIND S.A. nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <string.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/queue.h>

#include <rte_interrupts.h>
#include <rte_log.h>
#include <rte_pci.h>
#include <rte_per_lcore.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_tailq.h>
#include <rte_eal.h>
#include <rte_string_fns.h>
#include <rte_common.h>
#include <rte_devargs.h>

#include "eal_private.h"

struct pci_driver_list pci_driver_list;
struct pci_device_list pci_device_list;

static struct rte_devargs *pci_devargs_lookup(struct rte_pci_device *dev)
{
	struct rte_devargs *devargs;

	TAILQ_FOREACH(devargs, &devargs_list, next) {
		if (devargs->type != RTE_DEVTYPE_BLACKLISTED_PCI &&
			devargs->type != RTE_DEVTYPE_WHITELISTED_PCI)
			continue;
		if (!memcmp(&dev->addr, &devargs->pci.addr, sizeof(dev->addr)))
			return devargs;
	}
	return NULL;
}

/*
 * If vendor/device ID match, call the devinit() function of all
 * registered driver for the given device. Return -1 if initialization
 * failed, return 1 if no driver is found for this device.
 * For drivers with the RTE_PCI_DRV_MULTIPLE flag enabled, register
 * the same device multiple times until failure to do so.
 * It is required for non-Intel NIC drivers provided by third-parties such
 * as 6WIND.
 */
static int
pci_probe_all_drivers(struct rte_pci_device *dev)
{
	struct rte_pci_driver *dr = NULL;
	int rc;

	TAILQ_FOREACH(dr, &pci_driver_list, next) {
		rc = rte_eal_pci_probe_one_driver(dr, dev);
		if (rc < 0)
			/* negative value is an error */
			return -1;
		if (rc > 0)
			/* positive value means driver not found */
			continue;
		/* initialize subsequent driver instances for this device */
		if ((dr->drv_flags & RTE_PCI_DRV_MULTIPLE) &&
			(dev->devargs == NULL ||
				dev->devargs->type != RTE_DEVTYPE_BLACKLISTED_PCI))
			while (rte_eal_pci_probe_one_driver(dr, dev) == 0)
				;
		return 0;
	}
	return 1;
}

/*
 * Scan the content of the PCI bus, and call the devinit() function for
 * all registered drivers that have a matching entry in its id_table
 * for discovered devices.
 */
int
rte_eal_pci_probe(void)
{
	struct rte_pci_device *dev = NULL;
	struct rte_devargs *devargs;
	int probe_all = 0;
	int ret = 0;

	if (rte_eal_devargs_type_count(RTE_DEVTYPE_WHITELISTED_PCI) == 0)
		probe_all = 1;

	TAILQ_FOREACH(dev, &pci_device_list, next) {
		/* check if device has already been initialized */
		if (dev->driver != NULL)
			continue;

		/* set devargs in PCI structure */
		devargs = pci_devargs_lookup(dev);
		if (devargs != NULL)
			dev->devargs = devargs;

		/* probe all or only whitelisted devices */
		if (probe_all)
			ret = pci_probe_all_drivers(dev);
		else if (devargs != NULL &&
			devargs->type == RTE_DEVTYPE_WHITELISTED_PCI)
			ret = pci_probe_all_drivers(dev);
		if (ret < 0)
			rte_exit(EXIT_FAILURE, "Requested device " PCI_PRI_FMT
				 " cannot be used\n", dev->addr.domain, dev->addr.bus,
				 dev->addr.devid, dev->addr.function);
	}

	return 0;
}

/* dump one device */
static int
pci_dump_one_device(FILE *f, struct rte_pci_device *dev)
{
	int i;

	fprintf(f, PCI_PRI_FMT, dev->addr.domain, dev->addr.bus,
	       dev->addr.devid, dev->addr.function);
	fprintf(f, " - vendor:%x device:%x\n", dev->id.vendor_id,
	       dev->id.device_id);

	for (i = 0; i != sizeof(dev->mem_resource) /
		sizeof(dev->mem_resource[0]); i++) {
		fprintf(f, "   %16.16"PRIx64" %16.16"PRIx64"\n",
			dev->mem_resource[i].phys_addr,
			dev->mem_resource[i].len);
	}
	return 0;
}

/* dump devices on the bus */
void
rte_eal_pci_dump(FILE *f)
{
	struct rte_pci_device *dev = NULL;

	TAILQ_FOREACH(dev, &pci_device_list, next) {
		pci_dump_one_device(f, dev);
	}
}

/* register a driver */
void
rte_eal_pci_register(struct rte_pci_driver *driver)
{
	TAILQ_INSERT_TAIL(&pci_driver_list, driver, next);
}

/* unregister a driver */
void
rte_eal_pci_unregister(struct rte_pci_driver *driver)
{
	TAILQ_REMOVE(&pci_driver_list, driver, next);
}