pci/hotplug/shpchp_sysfs.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Compaq Hot Plug Controller Driver
0004  *
0005  * Copyright (c) 1995,2001 Compaq Computer Corporation
0006  * Copyright (c) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
0007  * Copyright (c) 2001 IBM Corp.
0008  *
0009  * All rights reserved.
0010  *
0011  * Send feedback to <greg@kroah.com>
0012  *
0013  */
0014
0015 #include <linux/module.h>
0016 #include <linux/kernel.h>
0017 #include <linux/types.h>
0018 #include <linux/pci.h>
0019 #include "shpchp.h"
0020
0021
0022 /* A few routines that create sysfs entries for the hot plug controller */
0023
0024 static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
0025 {
0026     struct pci_dev *pdev;
0027     int index, busnr;
0028     struct resource *res;
0029     struct pci_bus *bus;
0030     size_t len = 0;
0031
0032     pdev = to_pci_dev(dev);
0033     bus = pdev->subordinate;
0034
0035     len += sysfs_emit_at(buf, len, "Free resources: memory\n");
0036     pci_bus_for_each_resource(bus, res, index) {
0037         if (res && (res->flags & IORESOURCE_MEM) &&
0038                 !(res->flags & IORESOURCE_PREFETCH)) {
0039             len += sysfs_emit_at(buf, len,
0040                          "start = %8.8llx, length = %8.8llx\n",
0041                          (unsigned long long)res->start,
0042                          (unsigned long long)resource_size(res));
0043         }
0044     }
0045     len += sysfs_emit_at(buf, len, "Free resources: prefetchable memory\n");
0046     pci_bus_for_each_resource(bus, res, index) {
0047         if (res && (res->flags & IORESOURCE_MEM) &&
0048                    (res->flags & IORESOURCE_PREFETCH)) {
0049             len += sysfs_emit_at(buf, len,
0050                          "start = %8.8llx, length = %8.8llx\n",
0051                          (unsigned long long)res->start,
0052                          (unsigned long long)resource_size(res));
0053         }
0054     }
0055     len += sysfs_emit_at(buf, len, "Free resources: IO\n");
0056     pci_bus_for_each_resource(bus, res, index) {
0057         if (res && (res->flags & IORESOURCE_IO)) {
0058             len += sysfs_emit_at(buf, len,
0059                          "start = %8.8llx, length = %8.8llx\n",
0060                          (unsigned long long)res->start,
0061                          (unsigned long long)resource_size(res));
0062         }
0063     }
0064     len += sysfs_emit_at(buf, len, "Free resources: bus numbers\n");
0065     for (busnr = bus->busn_res.start; busnr <= bus->busn_res.end; busnr++) {
0066         if (!pci_find_bus(pci_domain_nr(bus), busnr))
0067             break;
0068     }
0069     if (busnr < bus->busn_res.end)
0070         len += sysfs_emit_at(buf, len,
0071                      "start = %8.8x, length = %8.8x\n",
0072                      busnr, (int)(bus->busn_res.end - busnr));
0073
0074     return len;
0075 }
0076 static DEVICE_ATTR(ctrl, S_IRUGO, show_ctrl, NULL);
0077
0078 int shpchp_create_ctrl_files(struct controller *ctrl)
0079 {
0080     return device_create_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
0081 }
0082
0083 void shpchp_remove_ctrl_files(struct controller *ctrl)
0084 {
0085     device_remove_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
0086 }