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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tape_proc.c (3045B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *    tape device driver for S/390 and zSeries tapes.
      4 *
      5 *  S390 and zSeries version
      6 *    Copyright IBM Corp. 2001
      7 *    Author(s): Carsten Otte <cotte@de.ibm.com>
      8 *		 Michael Holzheu <holzheu@de.ibm.com>
      9 *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>
     10 *
     11 * PROCFS Functions
     12 */
     13
     14#define KMSG_COMPONENT "tape"
     15#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
     16
     17#include <linux/module.h>
     18#include <linux/vmalloc.h>
     19#include <linux/seq_file.h>
     20#include <linux/proc_fs.h>
     21
     22#define TAPE_DBF_AREA	tape_core_dbf
     23
     24#include "tape.h"
     25
     26static const char *tape_med_st_verbose[MS_SIZE] =
     27{
     28	[MS_UNKNOWN] = "UNKNOWN ",
     29	[MS_LOADED] = "LOADED  ",
     30	[MS_UNLOADED] = "UNLOADED"
     31};
     32
     33/* our proc tapedevices entry */
     34static struct proc_dir_entry *tape_proc_devices;
     35
     36/*
     37 * Show function for /proc/tapedevices
     38 */
     39static int tape_proc_show(struct seq_file *m, void *v)
     40{
     41	struct tape_device *device;
     42	struct tape_request *request;
     43	const char *str;
     44	unsigned long n;
     45
     46	n = (unsigned long) v - 1;
     47	if (!n) {
     48		seq_printf(m, "TapeNo\tBusID      CuType/Model\t"
     49			"DevType/Model\tBlkSize\tState\tOp\tMedState\n");
     50	}
     51	device = tape_find_device(n);
     52	if (IS_ERR(device))
     53		return 0;
     54	spin_lock_irq(get_ccwdev_lock(device->cdev));
     55	seq_printf(m, "%d\t", (int) n);
     56	seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev));
     57	seq_printf(m, "%04X/", device->cdev->id.cu_type);
     58	seq_printf(m, "%02X\t", device->cdev->id.cu_model);
     59	seq_printf(m, "%04X/", device->cdev->id.dev_type);
     60	seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
     61	if (device->char_data.block_size == 0)
     62		seq_printf(m, "auto\t");
     63	else
     64		seq_printf(m, "%i\t", device->char_data.block_size);
     65	if (device->tape_state >= 0 &&
     66	    device->tape_state < TS_SIZE)
     67		str = tape_state_verbose[device->tape_state];
     68	else
     69		str = "UNKNOWN";
     70	seq_printf(m, "%s\t", str);
     71	if (!list_empty(&device->req_queue)) {
     72		request = list_entry(device->req_queue.next,
     73				     struct tape_request, list);
     74		str = tape_op_verbose[request->op];
     75	} else
     76		str = "---";
     77	seq_printf(m, "%s\t", str);
     78	seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
     79	spin_unlock_irq(get_ccwdev_lock(device->cdev));
     80	tape_put_device(device);
     81        return 0;
     82}
     83
     84static void *tape_proc_start(struct seq_file *m, loff_t *pos)
     85{
     86	if (*pos >= 256 / TAPE_MINORS_PER_DEV)
     87		return NULL;
     88	return (void *)((unsigned long) *pos + 1);
     89}
     90
     91static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
     92{
     93	++*pos;
     94	return tape_proc_start(m, pos);
     95}
     96
     97static void tape_proc_stop(struct seq_file *m, void *v)
     98{
     99}
    100
    101static const struct seq_operations tape_proc_seq = {
    102	.start		= tape_proc_start,
    103	.next		= tape_proc_next,
    104	.stop		= tape_proc_stop,
    105	.show		= tape_proc_show,
    106};
    107
    108/*
    109 * Initialize procfs stuff on startup
    110 */
    111void
    112tape_proc_init(void)
    113{
    114	tape_proc_devices = proc_create_seq("tapedevices", 0444, NULL,
    115					    &tape_proc_seq);
    116}
    117
    118/*
    119 * Cleanup all stuff registered to the procfs
    120 */
    121void
    122tape_proc_cleanup(void)
    123{
    124	if (tape_proc_devices != NULL)
    125		remove_proc_entry ("tapedevices", NULL);
    126}