// SPDX-License-Identifier: GPL-2.0
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/*
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* tape device driver for S/390 and zSeries tapes.
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*
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* S390 and zSeries version
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* Copyright IBM Corp. 2001
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* Author(s): Carsten Otte <cotte@de.ibm.com>
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* Michael Holzheu <holzheu@de.ibm.com>
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* Tuan Ngo-Anh <ngoanh@de.ibm.com>
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*
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* PROCFS Functions
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*/
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#define KMSG_COMPONENT "tape"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#define TAPE_DBF_AREA tape_core_dbf
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#include "tape.h"
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static const char *tape_med_st_verbose[MS_SIZE] =
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{
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[MS_UNKNOWN] = "UNKNOWN ",
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[MS_LOADED] = "LOADED ",
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[MS_UNLOADED] = "UNLOADED"
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};
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/* our proc tapedevices entry */
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static struct proc_dir_entry *tape_proc_devices;
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/*
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* Show function for /proc/tapedevices
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*/
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static int tape_proc_show(struct seq_file *m, void *v)
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{
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struct tape_device *device;
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struct tape_request *request;
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const char *str;
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unsigned long n;
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n = (unsigned long) v - 1;
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if (!n) {
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seq_printf(m, "TapeNo\tBusID CuType/Model\t"
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"DevType/Model\tBlkSize\tState\tOp\tMedState\n");
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}
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device = tape_find_device(n);
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if (IS_ERR(device))
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return 0;
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spin_lock_irq(get_ccwdev_lock(device->cdev));
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seq_printf(m, "%d\t", (int) n);
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seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev));
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seq_printf(m, "%04X/", device->cdev->id.cu_type);
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seq_printf(m, "%02X\t", device->cdev->id.cu_model);
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seq_printf(m, "%04X/", device->cdev->id.dev_type);
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seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
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if (device->char_data.block_size == 0)
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seq_printf(m, "auto\t");
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else
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seq_printf(m, "%i\t", device->char_data.block_size);
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if (device->tape_state >= 0 &&
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device->tape_state < TS_SIZE)
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str = tape_state_verbose[device->tape_state];
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else
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str = "UNKNOWN";
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seq_printf(m, "%s\t", str);
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if (!list_empty(&device->req_queue)) {
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request = list_entry(device->req_queue.next,
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struct tape_request, list);
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str = tape_op_verbose[request->op];
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} else
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str = "---";
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seq_printf(m, "%s\t", str);
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seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
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spin_unlock_irq(get_ccwdev_lock(device->cdev));
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tape_put_device(device);
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return 0;
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}
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static void *tape_proc_start(struct seq_file *m, loff_t *pos)
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{
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if (*pos >= 256 / TAPE_MINORS_PER_DEV)
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return NULL;
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return (void *)((unsigned long) *pos + 1);
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}
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static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return tape_proc_start(m, pos);
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}
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static void tape_proc_stop(struct seq_file *m, void *v)
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{
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}
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static const struct seq_operations tape_proc_seq = {
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.start = tape_proc_start,
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.next = tape_proc_next,
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.stop = tape_proc_stop,
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.show = tape_proc_show,
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};
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/*
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* Initialize procfs stuff on startup
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*/
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void
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tape_proc_init(void)
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{
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tape_proc_devices = proc_create_seq("tapedevices", 0444, NULL,
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&tape_proc_seq);
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}
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/*
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* Cleanup all stuff registered to the procfs
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*/
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void
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tape_proc_cleanup(void)
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{
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if (tape_proc_devices != NULL)
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remove_proc_entry ("tapedevices", NULL);
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}
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