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![Guilherme G. Piccoli](/assets/img/avatar_default.png)
Currently many console drivers for s390 rely on panic/reboot notifiers to invoke callbacks on these events. The panic() function disables local IRQs, secondary CPUs and preemption, so callbacks invoked on panic are effectively running in atomic context. Happens that most of these console callbacks from s390 doesn't take the proper care with regards to atomic context, like taking spinlocks that might be taken in other function/CPU and hence will cause a lockup situation. The goal for this patch is to improve the notifiers reliability, acting on 4 console drivers, as detailed below: (1) con3215: changed a regular spinlock to the trylock alternative. (2) con3270: also changed a regular spinlock to its trylock counterpart, but here we also have another problem: raw3270_activate_view() takes a different spinlock. So, we worked a helper to validate if this other lock is safe to acquire, and if so, raw3270_activate_view() should be safe. Notice though that there is a functional change here: it's now possible to continue the notifier code [reaching con3270_wait_write() and con3270_rebuild_update()] without executing raw3270_activate_view(). (3) sclp: a global lock is used heavily in the functions called from the notifier, so we added a check here - if the lock is taken already, we just bail-out, preventing the lockup. (4) sclp_vt220: same as (3), a lock validation was added to prevent the potential lockup problem. Besides (1)-(4), we also removed useless void functions, adding the code called from the notifier inside its own body, and changed the priority of such notifiers to execute late, since they are "heavyweight" for the panic environment, so we aim to reduce risks here. Changed return values to NOTIFY_DONE as well, the standard one. Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Link: https://lore.kernel.org/r/20220427224924.592546-14-gpiccoli@igalia.com Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
1307 lines
30 KiB
C
1307 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* IBM/3270 Driver - core functions.
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*
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* Author(s):
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* Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
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* Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Copyright IBM Corp. 2003, 2009
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/ebcdic.h>
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#include <asm/diag.h>
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#include "raw3270.h"
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#include <linux/major.h>
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#include <linux/kdev_t.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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struct class *class3270;
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/* The main 3270 data structure. */
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struct raw3270 {
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struct list_head list;
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struct ccw_device *cdev;
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int minor;
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short model, rows, cols;
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unsigned int state;
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unsigned long flags;
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struct list_head req_queue; /* Request queue. */
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struct list_head view_list; /* List of available views. */
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struct raw3270_view *view; /* Active view. */
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struct timer_list timer; /* Device timer. */
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unsigned char *ascebc; /* ascii -> ebcdic table */
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struct raw3270_view init_view;
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struct raw3270_request init_reset;
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struct raw3270_request init_readpart;
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struct raw3270_request init_readmod;
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unsigned char init_data[256];
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};
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/* raw3270->state */
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#define RAW3270_STATE_INIT 0 /* Initial state */
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#define RAW3270_STATE_RESET 1 /* Reset command is pending */
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#define RAW3270_STATE_W4ATTN 2 /* Wait for attention interrupt */
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#define RAW3270_STATE_READMOD 3 /* Read partition is pending */
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#define RAW3270_STATE_READY 4 /* Device is usable by views */
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/* raw3270->flags */
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#define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */
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#define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */
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#define RAW3270_FLAGS_CONSOLE 2 /* Device is the console. */
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/* Semaphore to protect global data of raw3270 (devices, views, etc). */
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static DEFINE_MUTEX(raw3270_mutex);
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/* List of 3270 devices. */
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static LIST_HEAD(raw3270_devices);
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/*
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* Flag to indicate if the driver has been registered. Some operations
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* like waiting for the end of i/o need to be done differently as long
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* as the kernel is still starting up (console support).
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*/
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static int raw3270_registered;
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/* Module parameters */
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static bool tubxcorrect;
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module_param(tubxcorrect, bool, 0);
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/*
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* Wait queue for device init/delete, view delete.
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*/
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DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
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static void __raw3270_disconnect(struct raw3270 *rp);
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/*
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* Encode array for 12 bit 3270 addresses.
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*/
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static unsigned char raw3270_ebcgraf[64] = {
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0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
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0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
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0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
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0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
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0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
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0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
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0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
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};
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static inline int raw3270_state_ready(struct raw3270 *rp)
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{
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return rp->state == RAW3270_STATE_READY;
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}
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static inline int raw3270_state_final(struct raw3270 *rp)
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{
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return rp->state == RAW3270_STATE_INIT ||
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rp->state == RAW3270_STATE_READY;
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}
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void
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raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
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{
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if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
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cp[0] = (addr >> 8) & 0x3f;
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cp[1] = addr & 0xff;
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} else {
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cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
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cp[1] = raw3270_ebcgraf[addr & 0x3f];
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}
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}
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/*
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* Allocate a new 3270 ccw request
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*/
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struct raw3270_request *
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raw3270_request_alloc(size_t size)
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{
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struct raw3270_request *rq;
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/* Allocate request structure */
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rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
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if (!rq)
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return ERR_PTR(-ENOMEM);
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/* alloc output buffer. */
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if (size > 0) {
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rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
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if (!rq->buffer) {
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kfree(rq);
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return ERR_PTR(-ENOMEM);
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}
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}
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rq->size = size;
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INIT_LIST_HEAD(&rq->list);
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/*
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* Setup ccw.
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*/
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rq->ccw.cda = __pa(rq->buffer);
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rq->ccw.flags = CCW_FLAG_SLI;
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return rq;
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}
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/*
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* Free 3270 ccw request
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*/
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void
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raw3270_request_free (struct raw3270_request *rq)
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{
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kfree(rq->buffer);
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kfree(rq);
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}
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/*
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* Reset request to initial state.
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*/
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void
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raw3270_request_reset(struct raw3270_request *rq)
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{
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BUG_ON(!list_empty(&rq->list));
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rq->ccw.cmd_code = 0;
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rq->ccw.count = 0;
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rq->ccw.cda = __pa(rq->buffer);
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rq->ccw.flags = CCW_FLAG_SLI;
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rq->rescnt = 0;
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rq->rc = 0;
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}
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/*
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* Set command code to ccw of a request.
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*/
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void
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raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
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{
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rq->ccw.cmd_code = cmd;
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}
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/*
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* Add data fragment to output buffer.
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*/
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int
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raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
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{
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if (size + rq->ccw.count > rq->size)
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return -E2BIG;
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memcpy(rq->buffer + rq->ccw.count, data, size);
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rq->ccw.count += size;
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return 0;
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}
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/*
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* Set address/length pair to ccw of a request.
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*/
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void
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raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
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{
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rq->ccw.cda = __pa(data);
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rq->ccw.count = size;
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}
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/*
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* Set idal buffer to ccw of a request.
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*/
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void
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raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
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{
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rq->ccw.cda = __pa(ib->data);
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rq->ccw.count = ib->size;
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rq->ccw.flags |= CCW_FLAG_IDA;
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}
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/*
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* Add the request to the request queue, try to start it if the
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* 3270 device is idle. Return without waiting for end of i/o.
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*/
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static int
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__raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
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struct raw3270_request *rq)
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{
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rq->view = view;
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raw3270_get_view(view);
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if (list_empty(&rp->req_queue) &&
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!test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
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/* No other requests are on the queue. Start this one. */
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rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
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(unsigned long) rq, 0, 0);
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if (rq->rc) {
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raw3270_put_view(view);
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return rq->rc;
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}
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}
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list_add_tail(&rq->list, &rp->req_queue);
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return 0;
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}
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int
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raw3270_view_active(struct raw3270_view *view)
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{
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struct raw3270 *rp = view->dev;
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return rp && rp->view == view;
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}
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int
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raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
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{
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unsigned long flags;
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struct raw3270 *rp;
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int rc;
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spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
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rp = view->dev;
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if (!rp || rp->view != view)
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rc = -EACCES;
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else if (!raw3270_state_ready(rp))
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rc = -EBUSY;
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else
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rc = __raw3270_start(rp, view, rq);
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spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
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return rc;
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}
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int
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raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
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{
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struct raw3270 *rp;
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int rc;
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rp = view->dev;
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if (!rp || rp->view != view)
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rc = -EACCES;
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else if (!raw3270_state_ready(rp))
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rc = -EBUSY;
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else
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rc = __raw3270_start(rp, view, rq);
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return rc;
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}
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int
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raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
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{
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struct raw3270 *rp;
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rp = view->dev;
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rq->view = view;
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raw3270_get_view(view);
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list_add_tail(&rq->list, &rp->req_queue);
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return 0;
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}
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/*
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* 3270 interrupt routine, called from the ccw_device layer
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*/
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static void
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raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
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{
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struct raw3270 *rp;
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struct raw3270_view *view;
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struct raw3270_request *rq;
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rp = dev_get_drvdata(&cdev->dev);
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if (!rp)
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return;
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rq = (struct raw3270_request *) intparm;
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view = rq ? rq->view : rp->view;
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if (!IS_ERR(irb)) {
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/* Handle CE-DE-UE and subsequent UDE */
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if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END)
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clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
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if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END |
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DEV_STAT_DEV_END |
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DEV_STAT_UNIT_EXCEP))
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set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
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/* Handle disconnected devices */
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if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
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(irb->ecw[0] & SNS0_INTERVENTION_REQ)) {
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set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
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if (rp->state > RAW3270_STATE_RESET)
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__raw3270_disconnect(rp);
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}
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/* Call interrupt handler of the view */
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if (view)
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view->fn->intv(view, rq, irb);
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}
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if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags))
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/* Device busy, do not start I/O */
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return;
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if (rq && !list_empty(&rq->list)) {
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/* The request completed, remove from queue and do callback. */
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list_del_init(&rq->list);
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if (rq->callback)
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rq->callback(rq, rq->callback_data);
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/* Do put_device for get_device in raw3270_start. */
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raw3270_put_view(view);
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}
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/*
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* Try to start each request on request queue until one is
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* started successful.
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*/
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while (!list_empty(&rp->req_queue)) {
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rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
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rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
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(unsigned long) rq, 0, 0);
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if (rq->rc == 0)
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break;
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/* Start failed. Remove request and do callback. */
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list_del_init(&rq->list);
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if (rq->callback)
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rq->callback(rq, rq->callback_data);
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/* Do put_device for get_device in raw3270_start. */
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raw3270_put_view(view);
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}
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}
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/*
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* To determine the size of the 3270 device we need to do:
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* 1) send a 'read partition' data stream to the device
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* 2) wait for the attn interrupt that precedes the query reply
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* 3) do a read modified to get the query reply
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* To make things worse we have to cope with intervention
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* required (3270 device switched to 'stand-by') and command
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* rejects (old devices that can't do 'read partition').
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*/
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struct raw3270_ua { /* Query Reply structure for Usable Area */
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struct { /* Usable Area Query Reply Base */
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short l; /* Length of this structured field */
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char sfid; /* 0x81 if Query Reply */
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char qcode; /* 0x81 if Usable Area */
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char flags0;
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char flags1;
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short w; /* Width of usable area */
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short h; /* Heigth of usavle area */
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char units; /* 0x00:in; 0x01:mm */
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int xr;
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int yr;
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char aw;
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char ah;
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short buffsz; /* Character buffer size, bytes */
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char xmin;
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char ymin;
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char xmax;
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char ymax;
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} __attribute__ ((packed)) uab;
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struct { /* Alternate Usable Area Self-Defining Parameter */
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char l; /* Length of this Self-Defining Parm */
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char sdpid; /* 0x02 if Alternate Usable Area */
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char res;
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char auaid; /* 0x01 is Id for the A U A */
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short wauai; /* Width of AUAi */
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short hauai; /* Height of AUAi */
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char auaunits; /* 0x00:in, 0x01:mm */
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int auaxr;
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int auayr;
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char awauai;
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char ahauai;
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} __attribute__ ((packed)) aua;
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} __attribute__ ((packed));
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static void
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raw3270_size_device_vm(struct raw3270 *rp)
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{
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int rc, model;
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struct ccw_dev_id dev_id;
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struct diag210 diag_data;
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ccw_device_get_id(rp->cdev, &dev_id);
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diag_data.vrdcdvno = dev_id.devno;
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diag_data.vrdclen = sizeof(struct diag210);
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rc = diag210(&diag_data);
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model = diag_data.vrdccrmd;
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/* Use default model 2 if the size could not be detected */
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if (rc || model < 2 || model > 5)
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model = 2;
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switch (model) {
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case 2:
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rp->model = model;
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rp->rows = 24;
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rp->cols = 80;
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break;
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case 3:
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rp->model = model;
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rp->rows = 32;
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rp->cols = 80;
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break;
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case 4:
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rp->model = model;
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rp->rows = 43;
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rp->cols = 80;
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break;
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case 5:
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rp->model = model;
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rp->rows = 27;
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rp->cols = 132;
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break;
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}
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}
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static void
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raw3270_size_device(struct raw3270 *rp)
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{
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struct raw3270_ua *uap;
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/* Got a Query Reply */
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uap = (struct raw3270_ua *) (rp->init_data + 1);
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/* Paranoia check. */
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if (rp->init_readmod.rc || rp->init_data[0] != 0x88 ||
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uap->uab.qcode != 0x81) {
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/* Couldn't detect size. Use default model 2. */
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rp->model = 2;
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rp->rows = 24;
|
|
rp->cols = 80;
|
|
return;
|
|
}
|
|
/* Copy rows/columns of default Usable Area */
|
|
rp->rows = uap->uab.h;
|
|
rp->cols = uap->uab.w;
|
|
/* Check for 14 bit addressing */
|
|
if ((uap->uab.flags0 & 0x0d) == 0x01)
|
|
set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
|
|
/* Check for Alternate Usable Area */
|
|
if (uap->uab.l == sizeof(struct raw3270_ua) &&
|
|
uap->aua.sdpid == 0x02) {
|
|
rp->rows = uap->aua.hauai;
|
|
rp->cols = uap->aua.wauai;
|
|
}
|
|
/* Try to find a model. */
|
|
rp->model = 0;
|
|
if (rp->rows == 24 && rp->cols == 80)
|
|
rp->model = 2;
|
|
if (rp->rows == 32 && rp->cols == 80)
|
|
rp->model = 3;
|
|
if (rp->rows == 43 && rp->cols == 80)
|
|
rp->model = 4;
|
|
if (rp->rows == 27 && rp->cols == 132)
|
|
rp->model = 5;
|
|
}
|
|
|
|
static void
|
|
raw3270_size_device_done(struct raw3270 *rp)
|
|
{
|
|
struct raw3270_view *view;
|
|
|
|
rp->view = NULL;
|
|
rp->state = RAW3270_STATE_READY;
|
|
/* Notify views about new size */
|
|
list_for_each_entry(view, &rp->view_list, list)
|
|
if (view->fn->resize)
|
|
view->fn->resize(view, rp->model, rp->rows, rp->cols);
|
|
/* Setup processing done, now activate a view */
|
|
list_for_each_entry(view, &rp->view_list, list) {
|
|
rp->view = view;
|
|
if (view->fn->activate(view) == 0)
|
|
break;
|
|
rp->view = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
raw3270_read_modified_cb(struct raw3270_request *rq, void *data)
|
|
{
|
|
struct raw3270 *rp = rq->view->dev;
|
|
|
|
raw3270_size_device(rp);
|
|
raw3270_size_device_done(rp);
|
|
}
|
|
|
|
static void
|
|
raw3270_read_modified(struct raw3270 *rp)
|
|
{
|
|
if (rp->state != RAW3270_STATE_W4ATTN)
|
|
return;
|
|
/* Use 'read modified' to get the result of a read partition. */
|
|
memset(&rp->init_readmod, 0, sizeof(rp->init_readmod));
|
|
memset(&rp->init_data, 0, sizeof(rp->init_data));
|
|
rp->init_readmod.ccw.cmd_code = TC_READMOD;
|
|
rp->init_readmod.ccw.flags = CCW_FLAG_SLI;
|
|
rp->init_readmod.ccw.count = sizeof(rp->init_data);
|
|
rp->init_readmod.ccw.cda = (__u32) __pa(rp->init_data);
|
|
rp->init_readmod.callback = raw3270_read_modified_cb;
|
|
rp->state = RAW3270_STATE_READMOD;
|
|
raw3270_start_irq(&rp->init_view, &rp->init_readmod);
|
|
}
|
|
|
|
static void
|
|
raw3270_writesf_readpart(struct raw3270 *rp)
|
|
{
|
|
static const unsigned char wbuf[] =
|
|
{ 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
|
|
|
|
/* Store 'read partition' data stream to init_data */
|
|
memset(&rp->init_readpart, 0, sizeof(rp->init_readpart));
|
|
memset(&rp->init_data, 0, sizeof(rp->init_data));
|
|
memcpy(&rp->init_data, wbuf, sizeof(wbuf));
|
|
rp->init_readpart.ccw.cmd_code = TC_WRITESF;
|
|
rp->init_readpart.ccw.flags = CCW_FLAG_SLI;
|
|
rp->init_readpart.ccw.count = sizeof(wbuf);
|
|
rp->init_readpart.ccw.cda = (__u32) __pa(&rp->init_data);
|
|
rp->state = RAW3270_STATE_W4ATTN;
|
|
raw3270_start_irq(&rp->init_view, &rp->init_readpart);
|
|
}
|
|
|
|
/*
|
|
* Device reset
|
|
*/
|
|
static void
|
|
raw3270_reset_device_cb(struct raw3270_request *rq, void *data)
|
|
{
|
|
struct raw3270 *rp = rq->view->dev;
|
|
|
|
if (rp->state != RAW3270_STATE_RESET)
|
|
return;
|
|
if (rq->rc) {
|
|
/* Reset command failed. */
|
|
rp->state = RAW3270_STATE_INIT;
|
|
} else if (MACHINE_IS_VM) {
|
|
raw3270_size_device_vm(rp);
|
|
raw3270_size_device_done(rp);
|
|
} else
|
|
raw3270_writesf_readpart(rp);
|
|
memset(&rp->init_reset, 0, sizeof(rp->init_reset));
|
|
}
|
|
|
|
static int
|
|
__raw3270_reset_device(struct raw3270 *rp)
|
|
{
|
|
int rc;
|
|
|
|
/* Check if reset is already pending */
|
|
if (rp->init_reset.view)
|
|
return -EBUSY;
|
|
/* Store reset data stream to init_data/init_reset */
|
|
rp->init_data[0] = TW_KR;
|
|
rp->init_reset.ccw.cmd_code = TC_EWRITEA;
|
|
rp->init_reset.ccw.flags = CCW_FLAG_SLI;
|
|
rp->init_reset.ccw.count = 1;
|
|
rp->init_reset.ccw.cda = (__u32) __pa(rp->init_data);
|
|
rp->init_reset.callback = raw3270_reset_device_cb;
|
|
rc = __raw3270_start(rp, &rp->init_view, &rp->init_reset);
|
|
if (rc == 0 && rp->state == RAW3270_STATE_INIT)
|
|
rp->state = RAW3270_STATE_RESET;
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
raw3270_reset_device(struct raw3270 *rp)
|
|
{
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
|
rc = __raw3270_reset_device(rp);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
raw3270_reset(struct raw3270_view *view)
|
|
{
|
|
struct raw3270 *rp;
|
|
int rc;
|
|
|
|
rp = view->dev;
|
|
if (!rp || rp->view != view)
|
|
rc = -EACCES;
|
|
else if (!raw3270_state_ready(rp))
|
|
rc = -EBUSY;
|
|
else
|
|
rc = raw3270_reset_device(view->dev);
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
__raw3270_disconnect(struct raw3270 *rp)
|
|
{
|
|
struct raw3270_request *rq;
|
|
struct raw3270_view *view;
|
|
|
|
rp->state = RAW3270_STATE_INIT;
|
|
rp->view = &rp->init_view;
|
|
/* Cancel all queued requests */
|
|
while (!list_empty(&rp->req_queue)) {
|
|
rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
|
|
view = rq->view;
|
|
rq->rc = -EACCES;
|
|
list_del_init(&rq->list);
|
|
if (rq->callback)
|
|
rq->callback(rq, rq->callback_data);
|
|
raw3270_put_view(view);
|
|
}
|
|
/* Start from scratch */
|
|
__raw3270_reset_device(rp);
|
|
}
|
|
|
|
static void
|
|
raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
|
|
struct irb *irb)
|
|
{
|
|
struct raw3270 *rp;
|
|
|
|
if (rq) {
|
|
if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
|
|
if (irb->ecw[0] & SNS0_CMD_REJECT)
|
|
rq->rc = -EOPNOTSUPP;
|
|
else
|
|
rq->rc = -EIO;
|
|
}
|
|
}
|
|
if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
|
|
/* Queue read modified after attention interrupt */
|
|
rp = view->dev;
|
|
raw3270_read_modified(rp);
|
|
}
|
|
}
|
|
|
|
static struct raw3270_fn raw3270_init_fn = {
|
|
.intv = raw3270_init_irq
|
|
};
|
|
|
|
/*
|
|
* Setup new 3270 device.
|
|
*/
|
|
static int
|
|
raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
|
|
{
|
|
struct list_head *l;
|
|
struct raw3270 *tmp;
|
|
int minor;
|
|
|
|
memset(rp, 0, sizeof(struct raw3270));
|
|
/* Copy ebcdic -> ascii translation table. */
|
|
memcpy(ascebc, _ascebc, 256);
|
|
if (tubxcorrect) {
|
|
/* correct brackets and circumflex */
|
|
ascebc['['] = 0xad;
|
|
ascebc[']'] = 0xbd;
|
|
ascebc['^'] = 0xb0;
|
|
}
|
|
rp->ascebc = ascebc;
|
|
|
|
/* Set defaults. */
|
|
rp->rows = 24;
|
|
rp->cols = 80;
|
|
|
|
INIT_LIST_HEAD(&rp->req_queue);
|
|
INIT_LIST_HEAD(&rp->view_list);
|
|
|
|
rp->init_view.dev = rp;
|
|
rp->init_view.fn = &raw3270_init_fn;
|
|
rp->view = &rp->init_view;
|
|
|
|
/*
|
|
* Add device to list and find the smallest unused minor
|
|
* number for it. Note: there is no device with minor 0,
|
|
* see special case for fs3270.c:fs3270_open().
|
|
*/
|
|
mutex_lock(&raw3270_mutex);
|
|
/* Keep the list sorted. */
|
|
minor = RAW3270_FIRSTMINOR;
|
|
rp->minor = -1;
|
|
list_for_each(l, &raw3270_devices) {
|
|
tmp = list_entry(l, struct raw3270, list);
|
|
if (tmp->minor > minor) {
|
|
rp->minor = minor;
|
|
__list_add(&rp->list, l->prev, l);
|
|
break;
|
|
}
|
|
minor++;
|
|
}
|
|
if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
|
|
rp->minor = minor;
|
|
list_add_tail(&rp->list, &raw3270_devices);
|
|
}
|
|
mutex_unlock(&raw3270_mutex);
|
|
/* No free minor number? Then give up. */
|
|
if (rp->minor == -1)
|
|
return -EUSERS;
|
|
rp->cdev = cdev;
|
|
dev_set_drvdata(&cdev->dev, rp);
|
|
cdev->handler = raw3270_irq;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_TN3270_CONSOLE
|
|
/* Tentative definition - see below for actual definition. */
|
|
static struct ccw_driver raw3270_ccw_driver;
|
|
|
|
/*
|
|
* Setup 3270 device configured as console.
|
|
*/
|
|
struct raw3270 __init *raw3270_setup_console(void)
|
|
{
|
|
struct ccw_device *cdev;
|
|
unsigned long flags;
|
|
struct raw3270 *rp;
|
|
char *ascebc;
|
|
int rc;
|
|
|
|
cdev = ccw_device_create_console(&raw3270_ccw_driver);
|
|
if (IS_ERR(cdev))
|
|
return ERR_CAST(cdev);
|
|
|
|
rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
|
|
ascebc = kzalloc(256, GFP_KERNEL);
|
|
rc = raw3270_setup_device(cdev, rp, ascebc);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
|
|
|
|
rc = ccw_device_enable_console(cdev);
|
|
if (rc) {
|
|
ccw_device_destroy_console(cdev);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
|
do {
|
|
__raw3270_reset_device(rp);
|
|
while (!raw3270_state_final(rp)) {
|
|
ccw_device_wait_idle(rp->cdev);
|
|
barrier();
|
|
}
|
|
} while (rp->state != RAW3270_STATE_READY);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
|
return rp;
|
|
}
|
|
|
|
void
|
|
raw3270_wait_cons_dev(struct raw3270 *rp)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
|
ccw_device_wait_idle(rp->cdev);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Create a 3270 device structure.
|
|
*/
|
|
static struct raw3270 *
|
|
raw3270_create_device(struct ccw_device *cdev)
|
|
{
|
|
struct raw3270 *rp;
|
|
char *ascebc;
|
|
int rc;
|
|
|
|
rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
|
|
if (!rp)
|
|
return ERR_PTR(-ENOMEM);
|
|
ascebc = kmalloc(256, GFP_KERNEL);
|
|
if (!ascebc) {
|
|
kfree(rp);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
rc = raw3270_setup_device(cdev, rp, ascebc);
|
|
if (rc) {
|
|
kfree(rp->ascebc);
|
|
kfree(rp);
|
|
rp = ERR_PTR(rc);
|
|
}
|
|
/* Get reference to ccw_device structure. */
|
|
get_device(&cdev->dev);
|
|
return rp;
|
|
}
|
|
|
|
/*
|
|
* This helper just validates that it is safe to activate a
|
|
* view in the panic() context, due to locking restrictions.
|
|
*/
|
|
int raw3270_view_lock_unavailable(struct raw3270_view *view)
|
|
{
|
|
struct raw3270 *rp = view->dev;
|
|
|
|
if (!rp)
|
|
return -ENODEV;
|
|
if (spin_is_locked(get_ccwdev_lock(rp->cdev)))
|
|
return -EBUSY;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Activate a view.
|
|
*/
|
|
int
|
|
raw3270_activate_view(struct raw3270_view *view)
|
|
{
|
|
struct raw3270 *rp;
|
|
struct raw3270_view *oldview, *nv;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
rp = view->dev;
|
|
if (!rp)
|
|
return -ENODEV;
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
|
if (rp->view == view)
|
|
rc = 0;
|
|
else if (!raw3270_state_ready(rp))
|
|
rc = -EBUSY;
|
|
else {
|
|
oldview = NULL;
|
|
if (rp->view && rp->view->fn->deactivate) {
|
|
oldview = rp->view;
|
|
oldview->fn->deactivate(oldview);
|
|
}
|
|
rp->view = view;
|
|
rc = view->fn->activate(view);
|
|
if (rc) {
|
|
/* Didn't work. Try to reactivate the old view. */
|
|
rp->view = oldview;
|
|
if (!oldview || oldview->fn->activate(oldview) != 0) {
|
|
/* Didn't work as well. Try any other view. */
|
|
list_for_each_entry(nv, &rp->view_list, list)
|
|
if (nv != view && nv != oldview) {
|
|
rp->view = nv;
|
|
if (nv->fn->activate(nv) == 0)
|
|
break;
|
|
rp->view = NULL;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Deactivate current view.
|
|
*/
|
|
void
|
|
raw3270_deactivate_view(struct raw3270_view *view)
|
|
{
|
|
unsigned long flags;
|
|
struct raw3270 *rp;
|
|
|
|
rp = view->dev;
|
|
if (!rp)
|
|
return;
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
|
if (rp->view == view) {
|
|
view->fn->deactivate(view);
|
|
rp->view = NULL;
|
|
/* Move deactivated view to end of list. */
|
|
list_del_init(&view->list);
|
|
list_add_tail(&view->list, &rp->view_list);
|
|
/* Try to activate another view. */
|
|
if (raw3270_state_ready(rp)) {
|
|
list_for_each_entry(view, &rp->view_list, list) {
|
|
rp->view = view;
|
|
if (view->fn->activate(view) == 0)
|
|
break;
|
|
rp->view = NULL;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
|
}
|
|
|
|
/*
|
|
* Add view to device with minor "minor".
|
|
*/
|
|
int
|
|
raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor, int subclass)
|
|
{
|
|
unsigned long flags;
|
|
struct raw3270 *rp;
|
|
int rc;
|
|
|
|
if (minor <= 0)
|
|
return -ENODEV;
|
|
mutex_lock(&raw3270_mutex);
|
|
rc = -ENODEV;
|
|
list_for_each_entry(rp, &raw3270_devices, list) {
|
|
if (rp->minor != minor)
|
|
continue;
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
|
atomic_set(&view->ref_count, 2);
|
|
view->dev = rp;
|
|
view->fn = fn;
|
|
view->model = rp->model;
|
|
view->rows = rp->rows;
|
|
view->cols = rp->cols;
|
|
view->ascebc = rp->ascebc;
|
|
spin_lock_init(&view->lock);
|
|
lockdep_set_subclass(&view->lock, subclass);
|
|
list_add(&view->list, &rp->view_list);
|
|
rc = 0;
|
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
|
break;
|
|
}
|
|
mutex_unlock(&raw3270_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Find specific view of device with minor "minor".
|
|
*/
|
|
struct raw3270_view *
|
|
raw3270_find_view(struct raw3270_fn *fn, int minor)
|
|
{
|
|
struct raw3270 *rp;
|
|
struct raw3270_view *view, *tmp;
|
|
unsigned long flags;
|
|
|
|
mutex_lock(&raw3270_mutex);
|
|
view = ERR_PTR(-ENODEV);
|
|
list_for_each_entry(rp, &raw3270_devices, list) {
|
|
if (rp->minor != minor)
|
|
continue;
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
|
list_for_each_entry(tmp, &rp->view_list, list) {
|
|
if (tmp->fn == fn) {
|
|
raw3270_get_view(tmp);
|
|
view = tmp;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
|
break;
|
|
}
|
|
mutex_unlock(&raw3270_mutex);
|
|
return view;
|
|
}
|
|
|
|
/*
|
|
* Remove view from device and free view structure via call to view->fn->free.
|
|
*/
|
|
void
|
|
raw3270_del_view(struct raw3270_view *view)
|
|
{
|
|
unsigned long flags;
|
|
struct raw3270 *rp;
|
|
struct raw3270_view *nv;
|
|
|
|
rp = view->dev;
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
|
if (rp->view == view) {
|
|
view->fn->deactivate(view);
|
|
rp->view = NULL;
|
|
}
|
|
list_del_init(&view->list);
|
|
if (!rp->view && raw3270_state_ready(rp)) {
|
|
/* Try to activate another view. */
|
|
list_for_each_entry(nv, &rp->view_list, list) {
|
|
if (nv->fn->activate(nv) == 0) {
|
|
rp->view = nv;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
|
/* Wait for reference counter to drop to zero. */
|
|
atomic_dec(&view->ref_count);
|
|
wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
|
|
if (view->fn->free)
|
|
view->fn->free(view);
|
|
}
|
|
|
|
/*
|
|
* Remove a 3270 device structure.
|
|
*/
|
|
static void
|
|
raw3270_delete_device(struct raw3270 *rp)
|
|
{
|
|
struct ccw_device *cdev;
|
|
|
|
/* Remove from device chain. */
|
|
mutex_lock(&raw3270_mutex);
|
|
list_del_init(&rp->list);
|
|
mutex_unlock(&raw3270_mutex);
|
|
|
|
/* Disconnect from ccw_device. */
|
|
cdev = rp->cdev;
|
|
rp->cdev = NULL;
|
|
dev_set_drvdata(&cdev->dev, NULL);
|
|
cdev->handler = NULL;
|
|
|
|
/* Put ccw_device structure. */
|
|
put_device(&cdev->dev);
|
|
|
|
/* Now free raw3270 structure. */
|
|
kfree(rp->ascebc);
|
|
kfree(rp);
|
|
}
|
|
|
|
static int
|
|
raw3270_probe (struct ccw_device *cdev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Additional attributes for a 3270 device
|
|
*/
|
|
static ssize_t
|
|
raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
return sysfs_emit(buf, "%i\n",
|
|
((struct raw3270 *)dev_get_drvdata(dev))->model);
|
|
}
|
|
static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL);
|
|
|
|
static ssize_t
|
|
raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
return sysfs_emit(buf, "%i\n",
|
|
((struct raw3270 *)dev_get_drvdata(dev))->rows);
|
|
}
|
|
static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL);
|
|
|
|
static ssize_t
|
|
raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
return sysfs_emit(buf, "%i\n",
|
|
((struct raw3270 *)dev_get_drvdata(dev))->cols);
|
|
}
|
|
static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL);
|
|
|
|
static struct attribute * raw3270_attrs[] = {
|
|
&dev_attr_model.attr,
|
|
&dev_attr_rows.attr,
|
|
&dev_attr_columns.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group raw3270_attr_group = {
|
|
.attrs = raw3270_attrs,
|
|
};
|
|
|
|
static int raw3270_create_attributes(struct raw3270 *rp)
|
|
{
|
|
return sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
|
|
}
|
|
|
|
/*
|
|
* Notifier for device addition/removal
|
|
*/
|
|
static LIST_HEAD(raw3270_notifier);
|
|
|
|
int raw3270_register_notifier(struct raw3270_notifier *notifier)
|
|
{
|
|
struct raw3270 *rp;
|
|
|
|
mutex_lock(&raw3270_mutex);
|
|
list_add_tail(¬ifier->list, &raw3270_notifier);
|
|
list_for_each_entry(rp, &raw3270_devices, list)
|
|
notifier->create(rp->minor);
|
|
mutex_unlock(&raw3270_mutex);
|
|
return 0;
|
|
}
|
|
|
|
void raw3270_unregister_notifier(struct raw3270_notifier *notifier)
|
|
{
|
|
struct raw3270 *rp;
|
|
|
|
mutex_lock(&raw3270_mutex);
|
|
list_for_each_entry(rp, &raw3270_devices, list)
|
|
notifier->destroy(rp->minor);
|
|
list_del(¬ifier->list);
|
|
mutex_unlock(&raw3270_mutex);
|
|
}
|
|
|
|
/*
|
|
* Set 3270 device online.
|
|
*/
|
|
static int
|
|
raw3270_set_online (struct ccw_device *cdev)
|
|
{
|
|
struct raw3270_notifier *np;
|
|
struct raw3270 *rp;
|
|
int rc;
|
|
|
|
rp = raw3270_create_device(cdev);
|
|
if (IS_ERR(rp))
|
|
return PTR_ERR(rp);
|
|
rc = raw3270_create_attributes(rp);
|
|
if (rc)
|
|
goto failure;
|
|
raw3270_reset_device(rp);
|
|
mutex_lock(&raw3270_mutex);
|
|
list_for_each_entry(np, &raw3270_notifier, list)
|
|
np->create(rp->minor);
|
|
mutex_unlock(&raw3270_mutex);
|
|
return 0;
|
|
|
|
failure:
|
|
raw3270_delete_device(rp);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Remove 3270 device structure.
|
|
*/
|
|
static void
|
|
raw3270_remove (struct ccw_device *cdev)
|
|
{
|
|
unsigned long flags;
|
|
struct raw3270 *rp;
|
|
struct raw3270_view *v;
|
|
struct raw3270_notifier *np;
|
|
|
|
rp = dev_get_drvdata(&cdev->dev);
|
|
/*
|
|
* _remove is the opposite of _probe; it's probe that
|
|
* should set up rp. raw3270_remove gets entered for
|
|
* devices even if they haven't been varied online.
|
|
* Thus, rp may validly be NULL here.
|
|
*/
|
|
if (rp == NULL)
|
|
return;
|
|
|
|
sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
|
|
|
|
/* Deactivate current view and remove all views. */
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
if (rp->view) {
|
|
if (rp->view->fn->deactivate)
|
|
rp->view->fn->deactivate(rp->view);
|
|
rp->view = NULL;
|
|
}
|
|
while (!list_empty(&rp->view_list)) {
|
|
v = list_entry(rp->view_list.next, struct raw3270_view, list);
|
|
if (v->fn->release)
|
|
v->fn->release(v);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
raw3270_del_view(v);
|
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
|
}
|
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
|
|
mutex_lock(&raw3270_mutex);
|
|
list_for_each_entry(np, &raw3270_notifier, list)
|
|
np->destroy(rp->minor);
|
|
mutex_unlock(&raw3270_mutex);
|
|
|
|
/* Reset 3270 device. */
|
|
raw3270_reset_device(rp);
|
|
/* And finally remove it. */
|
|
raw3270_delete_device(rp);
|
|
}
|
|
|
|
/*
|
|
* Set 3270 device offline.
|
|
*/
|
|
static int
|
|
raw3270_set_offline (struct ccw_device *cdev)
|
|
{
|
|
struct raw3270 *rp;
|
|
|
|
rp = dev_get_drvdata(&cdev->dev);
|
|
if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
|
|
return -EBUSY;
|
|
raw3270_remove(cdev);
|
|
return 0;
|
|
}
|
|
|
|
static struct ccw_device_id raw3270_id[] = {
|
|
{ CCW_DEVICE(0x3270, 0) },
|
|
{ CCW_DEVICE(0x3271, 0) },
|
|
{ CCW_DEVICE(0x3272, 0) },
|
|
{ CCW_DEVICE(0x3273, 0) },
|
|
{ CCW_DEVICE(0x3274, 0) },
|
|
{ CCW_DEVICE(0x3275, 0) },
|
|
{ CCW_DEVICE(0x3276, 0) },
|
|
{ CCW_DEVICE(0x3277, 0) },
|
|
{ CCW_DEVICE(0x3278, 0) },
|
|
{ CCW_DEVICE(0x3279, 0) },
|
|
{ CCW_DEVICE(0x3174, 0) },
|
|
{ /* end of list */ },
|
|
};
|
|
|
|
static struct ccw_driver raw3270_ccw_driver = {
|
|
.driver = {
|
|
.name = "3270",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.ids = raw3270_id,
|
|
.probe = &raw3270_probe,
|
|
.remove = &raw3270_remove,
|
|
.set_online = &raw3270_set_online,
|
|
.set_offline = &raw3270_set_offline,
|
|
.int_class = IRQIO_C70,
|
|
};
|
|
|
|
static int
|
|
raw3270_init(void)
|
|
{
|
|
struct raw3270 *rp;
|
|
int rc;
|
|
|
|
if (raw3270_registered)
|
|
return 0;
|
|
raw3270_registered = 1;
|
|
rc = ccw_driver_register(&raw3270_ccw_driver);
|
|
if (rc == 0) {
|
|
/* Create attributes for early (= console) device. */
|
|
mutex_lock(&raw3270_mutex);
|
|
class3270 = class_create(THIS_MODULE, "3270");
|
|
list_for_each_entry(rp, &raw3270_devices, list) {
|
|
get_device(&rp->cdev->dev);
|
|
raw3270_create_attributes(rp);
|
|
}
|
|
mutex_unlock(&raw3270_mutex);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
raw3270_exit(void)
|
|
{
|
|
ccw_driver_unregister(&raw3270_ccw_driver);
|
|
class_destroy(class3270);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(raw3270_init);
|
|
module_exit(raw3270_exit);
|
|
|
|
EXPORT_SYMBOL(class3270);
|
|
EXPORT_SYMBOL(raw3270_request_alloc);
|
|
EXPORT_SYMBOL(raw3270_request_free);
|
|
EXPORT_SYMBOL(raw3270_request_reset);
|
|
EXPORT_SYMBOL(raw3270_request_set_cmd);
|
|
EXPORT_SYMBOL(raw3270_request_add_data);
|
|
EXPORT_SYMBOL(raw3270_request_set_data);
|
|
EXPORT_SYMBOL(raw3270_request_set_idal);
|
|
EXPORT_SYMBOL(raw3270_buffer_address);
|
|
EXPORT_SYMBOL(raw3270_add_view);
|
|
EXPORT_SYMBOL(raw3270_del_view);
|
|
EXPORT_SYMBOL(raw3270_find_view);
|
|
EXPORT_SYMBOL(raw3270_activate_view);
|
|
EXPORT_SYMBOL(raw3270_deactivate_view);
|
|
EXPORT_SYMBOL(raw3270_start);
|
|
EXPORT_SYMBOL(raw3270_start_locked);
|
|
EXPORT_SYMBOL(raw3270_start_irq);
|
|
EXPORT_SYMBOL(raw3270_reset);
|
|
EXPORT_SYMBOL(raw3270_register_notifier);
|
|
EXPORT_SYMBOL(raw3270_unregister_notifier);
|
|
EXPORT_SYMBOL(raw3270_wait_queue);
|