diff options
Diffstat (limited to 'drivers/s390/char/tape_proc.c')
| -rw-r--r-- | drivers/s390/char/tape_proc.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/s390/char/tape_proc.c b/drivers/s390/char/tape_proc.c new file mode 100644 index 000000000..32a14ee31 --- /dev/null +++ b/drivers/s390/char/tape_proc.c @@ -0,0 +1,129 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * tape device driver for S/390 and zSeries tapes. + * + * S390 and zSeries version + * Copyright IBM Corp. 2001 + * Author(s): Carsten Otte <cotte@de.ibm.com> + * Michael Holzheu <holzheu@de.ibm.com> + * Tuan Ngo-Anh <ngoanh@de.ibm.com> + * + * PROCFS Functions + */ + +#define KMSG_COMPONENT "tape" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/module.h> +#include <linux/vmalloc.h> +#include <linux/seq_file.h> +#include <linux/proc_fs.h> + +#define TAPE_DBF_AREA tape_core_dbf + +#include "tape.h" + +static const char *tape_med_st_verbose[MS_SIZE] = +{ + [MS_UNKNOWN] = "UNKNOWN ", + [MS_LOADED] = "LOADED ", + [MS_UNLOADED] = "UNLOADED" +}; + +/* our proc tapedevices entry */ +static struct proc_dir_entry *tape_proc_devices; + +/* + * Show function for /proc/tapedevices + */ +static int tape_proc_show(struct seq_file *m, void *v) +{ + struct tape_device *device; + struct tape_request *request; + const char *str; + unsigned long n; + + n = (unsigned long) v - 1; + if (!n) { + seq_printf(m, "TapeNo\tBusID CuType/Model\t" + "DevType/Model\tBlkSize\tState\tOp\tMedState\n"); + } + device = tape_find_device(n); + if (IS_ERR(device)) + return 0; + spin_lock_irq(get_ccwdev_lock(device->cdev)); + seq_printf(m, "%d\t", (int) n); + seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev)); + seq_printf(m, "%04X/", device->cdev->id.cu_type); + seq_printf(m, "%02X\t", device->cdev->id.cu_model); + seq_printf(m, "%04X/", device->cdev->id.dev_type); + seq_printf(m, "%02X\t\t", device->cdev->id.dev_model); + if (device->char_data.block_size == 0) + seq_printf(m, "auto\t"); + else + seq_printf(m, "%i\t", device->char_data.block_size); + if (device->tape_state >= 0 && + device->tape_state < TS_SIZE) + str = tape_state_verbose[device->tape_state]; + else + str = "UNKNOWN"; + seq_printf(m, "%s\t", str); + if (!list_empty(&device->req_queue)) { + request = list_entry(device->req_queue.next, + struct tape_request, list); + str = tape_op_verbose[request->op]; + } else + str = "---"; + seq_printf(m, "%s\t", str); + seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + tape_put_device(device); + return 0; +} + +static void *tape_proc_start(struct seq_file *m, loff_t *pos) +{ + if (*pos >= 256 / TAPE_MINORS_PER_DEV) + return NULL; + return (void *)((unsigned long) *pos + 1); +} + +static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return tape_proc_start(m, pos); +} + +static void tape_proc_stop(struct seq_file *m, void *v) +{ +} + +static const struct seq_operations tape_proc_seq = { + .start = tape_proc_start, + .next = tape_proc_next, + .stop = tape_proc_stop, + .show = tape_proc_show, +}; + +/* + * Initialize procfs stuff on startup + */ +void +tape_proc_init(void) +{ + tape_proc_devices = proc_create_seq("tapedevices", + S_IFREG | S_IRUGO | S_IWUSR, NULL, &tape_proc_seq); + if (tape_proc_devices == NULL) { + return; + } +} + +/* + * Cleanup all stuff registered to the procfs + */ +void +tape_proc_cleanup(void) +{ + if (tape_proc_devices != NULL) + remove_proc_entry ("tapedevices", NULL); +} |