127 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * tape device driver for S/390 and zSeries tapes.4 *5 * S390 and zSeries version6 * Copyright IBM Corp. 20017 * 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 Functions12 */13 14#define KMSG_COMPONENT "tape"15#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt16 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_dbf23 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/tapedevices38 */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 else64 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 else69 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 } else76 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 startup110 */111void112tape_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 procfs120 */121void122tape_proc_cleanup(void)123{124 if (tape_proc_devices != NULL)125 remove_proc_entry ("tapedevices", NULL);126}127