^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * SCLP line mode console driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 1999, 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author(s): Martin Peschke <mpeschke@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Martin Schwidefsky <schwidefsky@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kmod.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/termios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "sclp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "sclp_rw.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "sclp_tty.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define sclp_console_major 4 /* TTYAUX_MAJOR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define sclp_console_minor 64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define sclp_console_name "ttyS"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* Lock to guard over changes to global variables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static spinlock_t sclp_con_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* List of free pages that can be used for console output buffering */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static struct list_head sclp_con_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /* List of full struct sclp_buffer structures ready for output */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static struct list_head sclp_con_outqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* Pointer to current console buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static struct sclp_buffer *sclp_conbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /* Timer for delayed output of console messages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static struct timer_list sclp_con_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /* Suspend mode flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int sclp_con_suspended;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /* Flag that output queue is currently running */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static int sclp_con_queue_running;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* Output format for console messages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static unsigned short sclp_con_columns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static unsigned short sclp_con_width_htab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) sclp_conbuf_callback(struct sclp_buffer *buffer, int rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) void *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) page = sclp_unmake_buffer(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /* Remove buffer from outqueue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) list_del(&buffer->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) list_add_tail((struct list_head *) page, &sclp_con_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /* Check if there is a pending buffer on the out queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) buffer = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (!list_empty(&sclp_con_outqueue))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) buffer = list_first_entry(&sclp_con_outqueue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct sclp_buffer, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (!buffer || sclp_con_suspended) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) sclp_con_queue_running = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) } while (sclp_emit_buffer(buffer, sclp_conbuf_callback));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * Finalize and emit first pending buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static void sclp_conbuf_emit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct sclp_buffer* buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (sclp_conbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) list_add_tail(&sclp_conbuf->list, &sclp_con_outqueue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) sclp_conbuf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (sclp_con_queue_running || sclp_con_suspended)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (list_empty(&sclp_con_outqueue))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) buffer = list_first_entry(&sclp_con_outqueue, struct sclp_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) sclp_con_queue_running = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) rc = sclp_emit_buffer(buffer, sclp_conbuf_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) sclp_conbuf_callback(buffer, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * Wait until out queue is empty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static void sclp_console_sync_queue(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (timer_pending(&sclp_con_timer))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) del_timer(&sclp_con_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) while (sclp_con_queue_running) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) sclp_sync_wait();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * When this routine is called from the timer then we flush the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * temporary write buffer without further waiting on a final new line.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) sclp_console_timeout(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) sclp_conbuf_emit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * Drop oldest console buffer if sclp_con_drop is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) sclp_console_drop_buffer(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) struct list_head *list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct sclp_buffer *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) void *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (!sclp_console_drop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) list = sclp_con_outqueue.next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (sclp_con_queue_running)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /* The first element is in I/O */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) list = list->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (list == &sclp_con_outqueue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) list_del(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) buffer = list_entry(list, struct sclp_buffer, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) page = sclp_unmake_buffer(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) list_add_tail((struct list_head *) page, &sclp_con_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * Writes the given message to S390 system console
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) sclp_console_write(struct console *console, const char *message,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) unsigned int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) void *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * process escape characters, write message into buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * send buffer to SCLP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /* make sure we have a console output buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (sclp_conbuf == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (list_empty(&sclp_con_pages))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) sclp_console_full++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) while (list_empty(&sclp_con_pages)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (sclp_con_suspended)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (sclp_console_drop_buffer())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) sclp_sync_wait();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) page = sclp_con_pages.next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) list_del((struct list_head *) page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) sclp_conbuf = sclp_make_buffer(page, sclp_con_columns,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) sclp_con_width_htab);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* try to write the string to the current output buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) written = sclp_write(sclp_conbuf, (const unsigned char *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) message, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (written == count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * Not all characters could be written to the current
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * output buffer. Emit the buffer, create a new buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * and then output the rest of the string.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) sclp_conbuf_emit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) message += written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) count -= written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) } while (count > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /* Setup timer to output current console buffer after 1/10 second */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (sclp_conbuf != NULL && sclp_chars_in_buffer(sclp_conbuf) != 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) !timer_pending(&sclp_con_timer)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) mod_timer(&sclp_con_timer, jiffies + HZ / 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static struct tty_driver *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) sclp_console_device(struct console *c, int *index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) *index = c->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return sclp_tty_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * Make sure that all buffers will be flushed to the SCLP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) sclp_console_flush(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) sclp_conbuf_emit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) sclp_console_sync_queue();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * Resume console: If there are cached messages, emit them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static void sclp_console_resume(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) sclp_con_suspended = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) sclp_conbuf_emit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * Suspend console: Set suspend flag and flush console
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static void sclp_console_suspend(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) spin_lock_irqsave(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) sclp_con_suspended = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) spin_unlock_irqrestore(&sclp_con_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) sclp_console_flush();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) static int sclp_console_notify(struct notifier_block *self,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) unsigned long event, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) sclp_console_flush();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static struct notifier_block on_panic_nb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) .notifier_call = sclp_console_notify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) .priority = SCLP_PANIC_PRIO_CLIENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static struct notifier_block on_reboot_nb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) .notifier_call = sclp_console_notify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) .priority = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * used to register the SCLP console to the kernel and to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * give printk necessary information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static struct console sclp_console =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) .name = sclp_console_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) .write = sclp_console_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) .device = sclp_console_device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) .flags = CON_PRINTBUFFER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) .index = 0 /* ttyS0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * This function is called for SCLP suspend and resume events.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) switch (sclp_pm_event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) case SCLP_PM_EVENT_FREEZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) sclp_console_suspend();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) case SCLP_PM_EVENT_RESTORE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) case SCLP_PM_EVENT_THAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) sclp_console_resume();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * called by console_init() in drivers/char/tty_io.c at boot-time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static int __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) sclp_console_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) void *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) /* SCLP consoles are handled together */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (!(CONSOLE_IS_SCLP || CONSOLE_IS_VT220))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) rc = sclp_rw_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /* Allocate pages for output buffering */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) INIT_LIST_HEAD(&sclp_con_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) for (i = 0; i < sclp_console_pages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) list_add_tail(page, &sclp_con_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) INIT_LIST_HEAD(&sclp_con_outqueue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) spin_lock_init(&sclp_con_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) sclp_conbuf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) timer_setup(&sclp_con_timer, sclp_console_timeout, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) /* Set output format */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (MACHINE_IS_VM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * save 4 characters for the CPU number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * written at start of each line by VM/CP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) sclp_con_columns = 76;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) sclp_con_columns = 80;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) sclp_con_width_htab = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /* enable printk-access to this driver */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) register_reboot_notifier(&on_reboot_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) register_console(&sclp_console);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) console_initcall(sclp_console_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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