File: linux-pci-root.c

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/*
 * libefiboot - library for the manipulation of EFI boot variables
 * Copyright 2012-2018 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see
 * <http://www.gnu.org/licenses/>.
 *
 */

#include "fix_coverity.h"

#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdint.h>
#include <unistd.h>

#include "efiboot.h"

/*
 * support for PCI root hub and devices
 *
 * various devices /sys/dev/block/$major:$minor start with:
 * maj:min -> ../../devices/pci$PCIROOT/$PCI_DEVICES/$BLOCKDEV_STUFF/block/$DISK/$PART
 * i.e.:                    pci0000:00/0000:00:1d.0/0000:05:00.0/
 *                          ^ root hub ^device      ^device
 *
 * for network devices, we also get:
 * /sys/class/net/$IFACE -> ../../devices/$PCI_STUFF/net/$IFACE
 *
 */
static ssize_t
parse_pci_root(struct device *dev, const char *current, const char *root UNUSED)
{
        int rc;
        int pos = 0;
        uint16_t root_domain;
        uint8_t root_bus;
        const char *devpart = current;

        debug("entry");

        /*
         * find the pci root domain and port; they basically look like:
         * pci0000:00/
         *    ^d   ^p
         */
        rc = sscanf(devpart, "../../devices/pci%hx:%hhx/%n", &root_domain, &root_bus, &pos);
        /*
         * If we can't find that, it's not a PCI device.
         */
        if (rc != 2)
                return 0;
        devpart += pos;

        dev->pci_root.pci_domain = root_domain;
        dev->pci_root.pci_bus = root_bus;

        rc = parse_acpi_hid_uid(dev, "devices/pci%04hx:%02hhx",
                                root_domain, root_bus);
        if (rc < 0)
                return -1;

        errno = 0;
        return devpart - current;
}

static ssize_t
dp_create_pci_root(struct device *dev UNUSED,
                   uint8_t *buf, ssize_t size, ssize_t off)
{
        ssize_t new = 0, sz = 0;
        debug("entry buf:%p size:%zd off:%zd", buf, size, off);
        debug("returning 0");
        if (dev->acpi_root.acpi_uid_str) {
                debug("creating acpi_hid_ex dp hid:0x%08x uid:\"%s\"",
                      dev->acpi_root.acpi_hid,
                      dev->acpi_root.acpi_uid_str);
                new = efidp_make_acpi_hid_ex(buf + off, size ? size - off : 0,
                                            dev->acpi_root.acpi_hid,
                                            0, 0, "",
                                            dev->acpi_root.acpi_uid_str,
                                            "");
                if (new < 0) {
                        efi_error("efidp_make_acpi_hid_ex() failed");
                        return new;
                }
        } else {
                debug("creating acpi_hid dp hid:0x%08x uid:0x%0"PRIx64,
                      dev->acpi_root.acpi_hid,
                      dev->acpi_root.acpi_uid);
                new = efidp_make_acpi_hid(buf + off, size ? size - off : 0,
                                         dev->acpi_root.acpi_hid,
                                         dev->acpi_root.acpi_uid);
                if (new < 0) {
                        efi_error("efidp_make_acpi_hid() failed");
                        return new;
                }
        }
        off += new;
        sz += new;

        debug("returning %zd", sz);
        return sz;
}

enum interface_type pci_root_iftypes[] = { pci_root, unknown };

struct dev_probe HIDDEN pci_root_parser = {
        .name = "pci_root",
        .iftypes = pci_root_iftypes,
        .flags = DEV_PROVIDES_ROOT,
        .parse = parse_pci_root,
        .create = dp_create_pci_root,
};