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 struct resource *res;
28 struct pci_bus *bus;
29 size_t len = 0;
30 int busnr;
31
32 pdev = to_pci_dev(dev);
33 bus = pdev->subordinate;
34
35 len += sysfs_emit_at(buf, at: len, fmt: "Free resources: memory\n");
36 pci_bus_for_each_resource(bus, res) {
37 if (res && (res->flags & IORESOURCE_MEM) &&
38 !(res->flags & IORESOURCE_PREFETCH)) {
39 len += sysfs_emit_at(buf, at: len,
40 fmt: "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, at: len, fmt: "Free resources: prefetchable memory\n");
46 pci_bus_for_each_resource(bus, res) {
47 if (res && (res->flags & IORESOURCE_MEM) &&
48 (res->flags & IORESOURCE_PREFETCH)) {
49 len += sysfs_emit_at(buf, at: len,
50 fmt: "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, at: len, fmt: "Free resources: IO\n");
56 pci_bus_for_each_resource(bus, res) {
57 if (res && (res->flags & IORESOURCE_IO)) {
58 len += sysfs_emit_at(buf, at: len,
59 fmt: "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, at: len, fmt: "Free resources: bus numbers\n");
65 for (busnr = bus->busn_res.start; busnr <= bus->busn_res.end; busnr++) {
66 if (!pci_find_bus(domain: pci_domain_nr(bus), busnr))
67 break;
68 }
69 if (busnr < bus->busn_res.end)
70 len += sysfs_emit_at(buf, at: len,
71 fmt: "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(device: &ctrl->pci_dev->dev, entry: &dev_attr_ctrl);
81}
82
83void shpchp_remove_ctrl_files(struct controller *ctrl)
84{
85 device_remove_file(dev: &ctrl->pci_dev->dev, attr: &dev_attr_ctrl);
86}
87

source code of linux/drivers/pci/hotplug/shpchp_sysfs.c