cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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shpchp_sysfs.c (2527B)

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