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126 lines
3.0 KiB
126 lines
3.0 KiB
// 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 <[email protected]> |
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* Michael Holzheu <[email protected]> |
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* Tuan Ngo-Anh <[email protected]> |
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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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