LXR linux/drivers/pci/hotplug/shpchp

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Compaq Hot Plug Controller Driver
   4 *
   5 * Copyright (c) 1995,2001 Compaq Computer Corporation
   6 * Copyright (c) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
   7 * Copyright (c) 2001 IBM Corp.
   8 *
   9 * All rights reserved.
  10 *
  11 * Send feedback to <greg@kroah.com>
  12 *
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/kernel.h>
  17#include <linux/types.h>
  18#include <linux/pci.h>
  19#include "shpchp.h"
  20
  21
  22/* A few routines that create sysfs entries for the hot plug controller */
  23
  24static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
  25{
  26        struct pci_dev *pdev;
  27        int index, busnr;
  28        struct resource *res;
  29        struct pci_bus *bus;
  30        size_t len = 0;
  31
  32        pdev = to_pci_dev(dev);
  33        bus = pdev->subordinate;
  34
  35        len += sysfs_emit_at(buf, len, "Free resources: memory\n");
  36        pci_bus_for_each_resource(bus, res, index) {
  37                if (res && (res->flags & IORESOURCE_MEM) &&
  38                                !(res->flags & IORESOURCE_PREFETCH)) {
  39                        len += sysfs_emit_at(buf, len,
  40                                             "start = %8.8llx, length = %8.8llx\n",
  41                                             (unsigned long long)res->start,
  42                                             (unsigned long long)resource_size(res));
  43                }
  44        }
  45        len += sysfs_emit_at(buf, len, "Free resources: prefetchable memory\n");
  46        pci_bus_for_each_resource(bus, res, index) {
  47                if (res && (res->flags & IORESOURCE_MEM) &&
  48                               (res->flags & IORESOURCE_PREFETCH)) {
  49                        len += sysfs_emit_at(buf, len,
  50                                             "start = %8.8llx, length = %8.8llx\n",
  51                                             (unsigned long long)res->start,
  52                                             (unsigned long long)resource_size(res));
  53                }
  54        }
  55        len += sysfs_emit_at(buf, len, "Free resources: IO\n");
  56        pci_bus_for_each_resource(bus, res, index) {
  57                if (res && (res->flags & IORESOURCE_IO)) {
  58                        len += sysfs_emit_at(buf, len,
  59                                             "start = %8.8llx, length = %8.8llx\n",
  60                                             (unsigned long long)res->start,
  61                                             (unsigned long long)resource_size(res));
  62                }
  63        }
  64        len += sysfs_emit_at(buf, len, "Free resources: bus numbers\n");
  65        for (busnr = bus->busn_res.start; busnr <= bus->busn_res.end; busnr++) {
  66                if (!pci_find_bus(pci_domain_nr(bus), busnr))
  67                        break;
  68        }
  69        if (busnr < bus->busn_res.end)
  70                len += sysfs_emit_at(buf, len,
  71                                     "start = %8.8x, length = %8.8x\n",
  72                                     busnr, (int)(bus->busn_res.end - busnr));
  73
  74        return len;
  75}
  76static DEVICE_ATTR(ctrl, S_IRUGO, show_ctrl, NULL);
  77
  78int shpchp_create_ctrl_files(struct controller *ctrl)
  79{
  80        return device_create_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
  81}
  82
  83void shpchp_remove_ctrl_files(struct controller *ctrl)
  84{
  85        device_remove_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
  86}
  87