drivers/pci/hotplug/shpchp_sysfs.c

   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
  24 static 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 }
  76 static DEVICE_ATTR(ctrl, S_IRUGO, show_ctrl, NULL);
  77
  78 int shpchp_create_ctrl_files(struct controller *ctrl)
  79 {
  80         return device_create_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
  81 }
  82
  83 void shpchp_remove_ctrl_files(struct controller *ctrl)
  84 {
  85         device_remove_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
  86 }