xref: /linux/drivers/pci/hotplug/shpchp_sysfs.c (revision 34dc1baba215b826e454b8d19e4f24adbeb7d00d)
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 	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, len, "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, 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) {
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) {
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 }
87