Commit 132fab13 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[S390] modular 3270 driver. 



The initial i/o to a 3270 device is done using the static module variables
raw3270_init_data and raw3270_init_request. If the 3270 device driver is
built as a module and gets loaded above 2GB, the initial i/o will fail
because these variables will get addresses > 2GB. To make it work the
two variables are moved to struct raw3270 and the data structure is
allocated with GFP_DMA.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 06fa46a2

drivers/s390/char/raw3270.c

+34 −33
Original line number Diff line number Diff line
@@ -50,6 +50,9 @@ struct raw3270 { 
	unsigned char *ascebc;		/* ascii -> ebcdic table */

	struct class_device *clttydev;	/* 3270-class tty device ptr */

	struct class_device *cltubdev;	/* 3270-class tub device ptr */



	struct raw3270_request init_request;

	unsigned char init_data[256];

};



/* raw3270->flags */
@@ -484,8 +487,6 @@ struct raw3270_ua { /* Query Reply structure for Usable Area */ 
	} __attribute__ ((packed)) aua;

} __attribute__ ((packed));



static unsigned char raw3270_init_data[256];

static struct raw3270_request raw3270_init_request;

static struct diag210 raw3270_init_diag210;

static DECLARE_MUTEX(raw3270_init_sem);
@@ -644,17 +645,17 @@ __raw3270_size_device(struct raw3270 *rp) 
	 * required (3270 device switched to 'stand-by') and command

	 * rejects (old devices that can't do 'read partition').

	 */

	memset(&raw3270_init_request, 0, sizeof(raw3270_init_request));

	memset(raw3270_init_data, 0, sizeof(raw3270_init_data));

	/* Store 'read partition' data stream to raw3270_init_data */

	memcpy(raw3270_init_data, wbuf, sizeof(wbuf));

	INIT_LIST_HEAD(&raw3270_init_request.list);

	raw3270_init_request.ccw.cmd_code = TC_WRITESF;

	raw3270_init_request.ccw.flags = CCW_FLAG_SLI;

	raw3270_init_request.ccw.count = sizeof(wbuf);

	raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data);



	rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request);

	memset(&rp->init_request, 0, sizeof(rp->init_request));

	memset(&rp->init_data, 0, 256);

	/* Store 'read partition' data stream to init_data */

	memcpy(&rp->init_data, wbuf, sizeof(wbuf));

	INIT_LIST_HEAD(&rp->init_request.list);

	rp->init_request.ccw.cmd_code = TC_WRITESF;

	rp->init_request.ccw.flags = CCW_FLAG_SLI;

	rp->init_request.ccw.count = sizeof(wbuf);

	rp->init_request.ccw.cda = (__u32) __pa(&rp->init_data);



	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);

	if (rc)

		/* Check error cases: -ERESTARTSYS, -EIO and -EOPNOTSUPP */

		return rc;
@@ -679,18 +680,18 @@ __raw3270_size_device(struct raw3270 *rp) 
	 * The device accepted the 'read partition' command. Now

	 * set up a read ccw and issue it.

	 */

	raw3270_init_request.ccw.cmd_code = TC_READMOD;

	raw3270_init_request.ccw.flags = CCW_FLAG_SLI;

	raw3270_init_request.ccw.count = sizeof(raw3270_init_data);

	raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data);

	rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request);

	rp->init_request.ccw.cmd_code = TC_READMOD;

	rp->init_request.ccw.flags = CCW_FLAG_SLI;

	rp->init_request.ccw.count = sizeof(rp->init_data);

	rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);

	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);

	if (rc)

		return rc;

	/* Got a Query Reply */

	count = sizeof(raw3270_init_data) - raw3270_init_request.rescnt;

	uap = (struct raw3270_ua *) (raw3270_init_data + 1);

	count = sizeof(rp->init_data) - rp->init_request.rescnt;

	uap = (struct raw3270_ua *) (rp->init_data + 1);

	/* Paranoia check. */

	if (raw3270_init_data[0] != 0x88 || uap->uab.qcode != 0x81)

	if (rp->init_data[0] != 0x88 || uap->uab.qcode != 0x81)

		return -EOPNOTSUPP;

	/* Copy rows/columns of default Usable Area */

	rp->rows = uap->uab.h;
@@ -749,18 +750,18 @@ raw3270_reset_device(struct raw3270 *rp) 
	int rc;



	down(&raw3270_init_sem);

	memset(&raw3270_init_request, 0, sizeof(raw3270_init_request));

	memset(raw3270_init_data, 0, sizeof(raw3270_init_data));

	/* Store reset data stream to raw3270_init_data/raw3270_init_request */

	raw3270_init_data[0] = TW_KR;

	INIT_LIST_HEAD(&raw3270_init_request.list);

	raw3270_init_request.ccw.cmd_code = TC_EWRITEA;

	raw3270_init_request.ccw.flags = CCW_FLAG_SLI;

	raw3270_init_request.ccw.count = 1;

	raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data);

	memset(&rp->init_request, 0, sizeof(rp->init_request));

	memset(&rp->init_data, 0, sizeof(rp->init_data));

	/* Store reset data stream to init_data/init_request */

	rp->init_data[0] = TW_KR;

	INIT_LIST_HEAD(&rp->init_request.list);

	rp->init_request.ccw.cmd_code = TC_EWRITEA;

	rp->init_request.ccw.flags = CCW_FLAG_SLI;

	rp->init_request.ccw.count = 1;

	rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);

	rp->view = &raw3270_init_view;

	raw3270_init_view.dev = rp;

	rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request);

	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);

	raw3270_init_view.dev = 0;

	rp->view = 0;

	up(&raw3270_init_sem);
@@ -854,7 +855,7 @@ raw3270_setup_console(struct ccw_device *cdev) 
	char *ascebc;

	int rc;



	rp = (struct raw3270 *) alloc_bootmem(sizeof(struct raw3270));

	rp = (struct raw3270 *) alloc_bootmem_low(sizeof(struct raw3270));

	ascebc = (char *) alloc_bootmem(256);

	rc = raw3270_setup_device(cdev, rp, ascebc);

	if (rc)
@@ -895,7 +896,7 @@ raw3270_create_device(struct ccw_device *cdev) 
	char *ascebc;

	int rc;



	rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL);

	rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);

	if (!rp)

		return ERR_PTR(-ENOMEM);

	ascebc = kmalloc(256, GFP_KERNEL);

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