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         char *out = buf;
  28         int index, busnr;
  29         struct resource *res;
  30         struct pci_bus *bus;
  31
  32         pdev = to_pci_dev(dev);
  33         bus = pdev->subordinate;
  34
  35         out += sprintf(buf, "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                         out += sprintf(out, "start = %8.8llx, length = %8.8llx\n",
  40                                        (unsigned long long)res->start,
  41                                        (unsigned long long)resource_size(res));
  42                 }
  43         }
  44         out += sprintf(out, "Free resources: prefetchable memory\n");
  45         pci_bus_for_each_resource(bus, res, index) {
  46                 if (res && (res->flags & IORESOURCE_MEM) &&
  47                                (res->flags & IORESOURCE_PREFETCH)) {
  48                         out += sprintf(out, "start = %8.8llx, length = %8.8llx\n",
  49                                        (unsigned long long)res->start,
  50                                        (unsigned long long)resource_size(res));
  51                 }
  52         }
  53         out += sprintf(out, "Free resources: IO\n");
  54         pci_bus_for_each_resource(bus, res, index) {
  55                 if (res && (res->flags & IORESOURCE_IO)) {
  56                         out += sprintf(out, "start = %8.8llx, length = %8.8llx\n",
  57                                        (unsigned long long)res->start,
  58                                        (unsigned long long)resource_size(res));
  59                 }
  60         }
  61         out += sprintf(out, "Free resources: bus numbers\n");
  62         for (busnr = bus->busn_res.start; busnr <= bus->busn_res.end; busnr++) {
  63                 if (!pci_find_bus(pci_domain_nr(bus), busnr))
  64                         break;
  65         }
  66         if (busnr < bus->busn_res.end)
  67                 out += sprintf(out, "start = %8.8x, length = %8.8x\n",
  68                                 busnr, (int)(bus->busn_res.end - busnr));
  69
  70         return out - buf;
  71 }
  72 static DEVICE_ATTR(ctrl, S_IRUGO, show_ctrl, NULL);
  73
  74 int shpchp_create_ctrl_files(struct controller *ctrl)
  75 {
  76         return device_create_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
  77 }
  78
  79 void shpchp_remove_ctrl_files(struct controller *ctrl)
  80 {
  81         device_remove_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
  82 }