[linux-2.6-block.git] / drivers / s390 / cio / device_id.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  CCW device SENSE ID I/O handling.
 *
 *    Copyright IBM Corp. 2002, 2009
 *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
 *		 Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <asm/machine.h>
#include <asm/ccwdev.h>
#include <asm/setup.h>
#include <asm/cio.h>
#include <asm/diag.h>

#include "cio.h"
#include "cio_debug.h"
#include "device.h"
#include "io_sch.h"

#define SENSE_ID_RETRIES	256
#define SENSE_ID_TIMEOUT	(10 * HZ)
#define SENSE_ID_MIN_LEN	4
#define SENSE_ID_BASIC_LEN	7

/**
 * diag210_to_senseid - convert diag 0x210 data to sense id information
 * @senseid: sense id
 * @diag: diag 0x210 data
 *
 * Return 0 on success, non-zero otherwise.
 */
static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
{
	static struct {
		int class, type, cu_type;
	} vm_devices[] = {
		{ 0x08, 0x01, 0x3480 },
		{ 0x08, 0x02, 0x3430 },
		{ 0x08, 0x10, 0x3420 },
		{ 0x08, 0x42, 0x3424 },
		{ 0x08, 0x44, 0x9348 },
		{ 0x08, 0x81, 0x3490 },
		{ 0x08, 0x82, 0x3422 },
		{ 0x10, 0x41, 0x1403 },
		{ 0x10, 0x42, 0x3211 },
		{ 0x10, 0x43, 0x3203 },
		{ 0x10, 0x45, 0x3800 },
		{ 0x10, 0x47, 0x3262 },
		{ 0x10, 0x48, 0x3820 },
		{ 0x10, 0x49, 0x3800 },
		{ 0x10, 0x4a, 0x4245 },
		{ 0x10, 0x4b, 0x4248 },
		{ 0x10, 0x4d, 0x3800 },
		{ 0x10, 0x4e, 0x3820 },
		{ 0x10, 0x4f, 0x3820 },
		{ 0x10, 0x82, 0x2540 },
		{ 0x10, 0x84, 0x3525 },
		{ 0x20, 0x81, 0x2501 },
		{ 0x20, 0x82, 0x2540 },
		{ 0x20, 0x84, 0x3505 },
		{ 0x40, 0x01, 0x3278 },
		{ 0x40, 0x04, 0x3277 },
		{ 0x40, 0x80, 0x2250 },
		{ 0x40, 0xc0, 0x5080 },
		{ 0x80, 0x00, 0x3215 },
	};
	int i;

	/* Special case for osa devices. */
	if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
		senseid->cu_type = 0x3088;
		senseid->cu_model = 0x60;
		senseid->reserved = 0xff;
		return 0;
	}
	for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
		if (diag->vrdcvcla == vm_devices[i].class &&
		    diag->vrdcvtyp == vm_devices[i].type) {
			senseid->cu_type = vm_devices[i].cu_type;
			senseid->reserved = 0xff;
			return 0;
		}
	}

	return -ENODEV;
}

/**
 * diag210_get_dev_info - retrieve device information via diag 0x210
 * @cdev: ccw device
 *
 * Returns zero on success, non-zero otherwise.
 */
static int diag210_get_dev_info(struct ccw_device *cdev)
{
	struct ccw_dev_id *dev_id = &cdev->private->dev_id;
	struct senseid *senseid = &cdev->private->dma_area->senseid;
	struct diag210 diag_data;
	int rc;

	if (dev_id->ssid != 0)
		return -ENODEV;
	memset(&diag_data, 0, sizeof(diag_data));
	diag_data.vrdcdvno	= dev_id->devno;
	diag_data.vrdclen	= sizeof(diag_data);
	rc = diag210(&diag_data);
	CIO_TRACE_EVENT(4, "diag210");
	CIO_HEX_EVENT(4, &rc, sizeof(rc));
	CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
	if (rc != 0 && rc != 2)
		goto err_failed;
	if (diag210_to_senseid(senseid, &diag_data))
		goto err_unknown;
	return 0;

err_unknown:
	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
		      dev_id->ssid, dev_id->devno);
	return -ENODEV;
err_failed:
	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
		      dev_id->ssid, dev_id->devno, rc);
	return -ENODEV;
}

/*
 * Initialize SENSE ID data.
 */
static void snsid_init(struct ccw_device *cdev)
{
	cdev->private->flags.esid = 0;

	memset(&cdev->private->dma_area->senseid, 0,
	       sizeof(cdev->private->dma_area->senseid));
	cdev->private->dma_area->senseid.cu_type = 0xffff;
}

/*
 * Check for complete SENSE ID data.
 */
static int snsid_check(struct ccw_device *cdev, void *data)
{
	struct cmd_scsw *scsw = &cdev->private->dma_area->irb.scsw.cmd;
	int len = sizeof(struct senseid) - scsw->count;

	/* Check for incomplete SENSE ID data. */
	if (len < SENSE_ID_MIN_LEN)
		goto out_restart;
	if (cdev->private->dma_area->senseid.cu_type == 0xffff)
		goto out_restart;
	/* Check for incompatible SENSE ID data. */
	if (cdev->private->dma_area->senseid.reserved != 0xff)
		return -EOPNOTSUPP;
	/* Check for extended-identification information. */
	if (len > SENSE_ID_BASIC_LEN)
		cdev->private->flags.esid = 1;
	return 0;

out_restart:
	snsid_init(cdev);
	return -EAGAIN;
}

/*
 * Process SENSE ID request result.
 */
static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
{
	struct ccw_dev_id *id = &cdev->private->dev_id;
	struct senseid *senseid = &cdev->private->dma_area->senseid;
	int vm = 0;

	if (rc && machine_is_vm()) {
		/* Try diag 0x210 fallback on z/VM. */
		snsid_init(cdev);
		if (diag210_get_dev_info(cdev) == 0) {
			rc = 0;
			vm = 1;
		}
	}
	CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
		      "%04x/%02x%s\n", id->ssid, id->devno, rc,
		      senseid->cu_type, senseid->cu_model, senseid->dev_type,
		      senseid->dev_model, vm ? " (diag210)" : "");
	ccw_device_sense_id_done(cdev, rc);
}

/**
 * ccw_device_sense_id_start - perform SENSE ID
 * @cdev: ccw device
 *
 * Execute a SENSE ID channel program on @cdev to update its sense id
 * information. When finished, call ccw_device_sense_id_done with a
 * return code specifying the result.
 */
void ccw_device_sense_id_start(struct ccw_device *cdev)
{
	struct subchannel *sch = to_subchannel(cdev->dev.parent);
	struct ccw_request *req = &cdev->private->req;
	struct ccw1 *cp = cdev->private->dma_area->iccws;

	CIO_TRACE_EVENT(4, "snsid");
	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
	/* Data setup. */
	snsid_init(cdev);
	/* Channel program setup. */
	cp->cmd_code	= CCW_CMD_SENSE_ID;
	cp->cda		= virt_to_dma32(&cdev->private->dma_area->senseid);
	cp->count	= sizeof(struct senseid);
	cp->flags	= CCW_FLAG_SLI;
	/* Request setup. */
	memset(req, 0, sizeof(*req));
	req->cp		= cp;
	req->timeout	= SENSE_ID_TIMEOUT;
	req->maxretries	= SENSE_ID_RETRIES;
	req->lpm	= sch->schib.pmcw.pam & sch->opm;
	req->check	= snsid_check;
	req->callback	= snsid_callback;
	ccw_request_start(cdev);
}
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* CCW device SENSE ID I/O handling.
	4	*
	5	* Copyright IBM Corp. 2002, 2009
	6	* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
	7	* Martin Schwidefsky <schwidefsky@de.ibm.com>
	8	* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/string.h>
	13	#include <linux/types.h>
	14	#include <linux/errno.h>
	15	#include <asm/machine.h>
	16	#include <asm/ccwdev.h>
	17	#include <asm/setup.h>
	18	#include <asm/cio.h>
	19	#include <asm/diag.h>
	20
	21	#include "cio.h"
	22	#include "cio_debug.h"
	23	#include "device.h"
	24	#include "io_sch.h"
	25
	26	#define SENSE_ID_RETRIES 256
	27	#define SENSE_ID_TIMEOUT (10 * HZ)
	28	#define SENSE_ID_MIN_LEN 4
	29	#define SENSE_ID_BASIC_LEN 7
	30
	31	/**
	32	* diag210_to_senseid - convert diag 0x210 data to sense id information
	33	* @senseid: sense id
	34	* @diag: diag 0x210 data
	35	*
	36	* Return 0 on success, non-zero otherwise.
	37	*/
	38	static int diag210_to_senseid(struct senseid senseid, struct diag210 diag)
	39	{
	40	static struct {
	41	int class, type, cu_type;
	42	} vm_devices[] = {
	43	{ 0x08, 0x01, 0x3480 },
	44	{ 0x08, 0x02, 0x3430 },
	45	{ 0x08, 0x10, 0x3420 },
	46	{ 0x08, 0x42, 0x3424 },
	47	{ 0x08, 0x44, 0x9348 },
	48	{ 0x08, 0x81, 0x3490 },
	49	{ 0x08, 0x82, 0x3422 },
	50	{ 0x10, 0x41, 0x1403 },
	51	{ 0x10, 0x42, 0x3211 },
	52	{ 0x10, 0x43, 0x3203 },
	53	{ 0x10, 0x45, 0x3800 },
	54	{ 0x10, 0x47, 0x3262 },
	55	{ 0x10, 0x48, 0x3820 },
	56	{ 0x10, 0x49, 0x3800 },
	57	{ 0x10, 0x4a, 0x4245 },
	58	{ 0x10, 0x4b, 0x4248 },
	59	{ 0x10, 0x4d, 0x3800 },
	60	{ 0x10, 0x4e, 0x3820 },
	61	{ 0x10, 0x4f, 0x3820 },
	62	{ 0x10, 0x82, 0x2540 },
	63	{ 0x10, 0x84, 0x3525 },
	64	{ 0x20, 0x81, 0x2501 },
	65	{ 0x20, 0x82, 0x2540 },
	66	{ 0x20, 0x84, 0x3505 },
	67	{ 0x40, 0x01, 0x3278 },
	68	{ 0x40, 0x04, 0x3277 },
	69	{ 0x40, 0x80, 0x2250 },
	70	{ 0x40, 0xc0, 0x5080 },
	71	{ 0x80, 0x00, 0x3215 },
	72	};
	73	int i;
	74
	75	/* Special case for osa devices. */
	76	if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
	77	senseid->cu_type = 0x3088;
	78	senseid->cu_model = 0x60;
	79	senseid->reserved = 0xff;
	80	return 0;
	81	}
	82	for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
	83	if (diag->vrdcvcla == vm_devices[i].class &&
	84	diag->vrdcvtyp == vm_devices[i].type) {
	85	senseid->cu_type = vm_devices[i].cu_type;
	86	senseid->reserved = 0xff;
	87	return 0;
	88	}
	89	}
	90
	91	return -ENODEV;
	92	}
	93
	94	/**
	95	* diag210_get_dev_info - retrieve device information via diag 0x210
	96	* @cdev: ccw device
	97	*
	98	* Returns zero on success, non-zero otherwise.
	99	*/
	100	static int diag210_get_dev_info(struct ccw_device *cdev)
	101	{
	102	struct ccw_dev_id *dev_id = &cdev->private->dev_id;
	103	struct senseid *senseid = &cdev->private->dma_area->senseid;
	104	struct diag210 diag_data;
	105	int rc;
	106
	107	if (dev_id->ssid != 0)
	108	return -ENODEV;
	109	memset(&diag_data, 0, sizeof(diag_data));
	110	diag_data.vrdcdvno = dev_id->devno;
	111	diag_data.vrdclen = sizeof(diag_data);
	112	rc = diag210(&diag_data);
	113	CIO_TRACE_EVENT(4, "diag210");
	114	CIO_HEX_EVENT(4, &rc, sizeof(rc));
	115	CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
	116	if (rc != 0 && rc != 2)
	117	goto err_failed;
	118	if (diag210_to_senseid(senseid, &diag_data))
	119	goto err_unknown;
	120	return 0;
	121
	122	err_unknown:
	123	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
	124	dev_id->ssid, dev_id->devno);
	125	return -ENODEV;
	126	err_failed:
	127	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
	128	dev_id->ssid, dev_id->devno, rc);
	129	return -ENODEV;
	130	}
	131
	132	/*
	133	* Initialize SENSE ID data.
	134	*/
	135	static void snsid_init(struct ccw_device *cdev)
	136	{
	137	cdev->private->flags.esid = 0;
	138
	139	memset(&cdev->private->dma_area->senseid, 0,
	140	sizeof(cdev->private->dma_area->senseid));
	141	cdev->private->dma_area->senseid.cu_type = 0xffff;
	142	}
	143
	144	/*
	145	* Check for complete SENSE ID data.
	146	*/
	147	static int snsid_check(struct ccw_device cdev, void data)
	148	{
	149	struct cmd_scsw *scsw = &cdev->private->dma_area->irb.scsw.cmd;
	150	int len = sizeof(struct senseid) - scsw->count;
	151
	152	/* Check for incomplete SENSE ID data. */
	153	if (len < SENSE_ID_MIN_LEN)
	154	goto out_restart;
	155	if (cdev->private->dma_area->senseid.cu_type == 0xffff)
	156	goto out_restart;
	157	/* Check for incompatible SENSE ID data. */
	158	if (cdev->private->dma_area->senseid.reserved != 0xff)
	159	return -EOPNOTSUPP;
	160	/* Check for extended-identification information. */
	161	if (len > SENSE_ID_BASIC_LEN)
	162	cdev->private->flags.esid = 1;
	163	return 0;
	164
	165	out_restart:
	166	snsid_init(cdev);
	167	return -EAGAIN;
	168	}
	169
	170	/*
	171	* Process SENSE ID request result.
	172	*/
	173	static void snsid_callback(struct ccw_device cdev, void data, int rc)
	174	{
	175	struct ccw_dev_id *id = &cdev->private->dev_id;
	176	struct senseid *senseid = &cdev->private->dma_area->senseid;
	177	int vm = 0;
	178
	179	if (rc && machine_is_vm()) {
	180	/* Try diag 0x210 fallback on z/VM. */
	181	snsid_init(cdev);
	182	if (diag210_get_dev_info(cdev) == 0) {
	183	rc = 0;
	184	vm = 1;
	185	}
	186	}
	187	CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
	188	"%04x/%02x%s\n", id->ssid, id->devno, rc,
	189	senseid->cu_type, senseid->cu_model, senseid->dev_type,
	190	senseid->dev_model, vm ? " (diag210)" : "");
	191	ccw_device_sense_id_done(cdev, rc);
	192	}
	193
	194	/**
	195	* ccw_device_sense_id_start - perform SENSE ID
	196	* @cdev: ccw device
	197	*
	198	* Execute a SENSE ID channel program on @cdev to update its sense id
	199	* information. When finished, call ccw_device_sense_id_done with a
	200	* return code specifying the result.
	201	*/
	202	void ccw_device_sense_id_start(struct ccw_device *cdev)
	203	{
	204	struct subchannel *sch = to_subchannel(cdev->dev.parent);
	205	struct ccw_request *req = &cdev->private->req;
	206	struct ccw1 *cp = cdev->private->dma_area->iccws;
	207
	208	CIO_TRACE_EVENT(4, "snsid");
	209	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
	210	/* Data setup. */
	211	snsid_init(cdev);
	212	/* Channel program setup. */
	213	cp->cmd_code = CCW_CMD_SENSE_ID;
	214	cp->cda = virt_to_dma32(&cdev->private->dma_area->senseid);
	215	cp->count = sizeof(struct senseid);
	216	cp->flags = CCW_FLAG_SLI;
	217	/* Request setup. */
	218	memset(req, 0, sizeof(*req));
	219	req->cp = cp;
	220	req->timeout = SENSE_ID_TIMEOUT;
	221	req->maxretries = SENSE_ID_RETRIES;
	222	req->lpm = sch->schib.pmcw.pam & sch->opm;
	223	req->check = snsid_check;
	224	req->callback = snsid_callback;
	225	ccw_request_start(cdev);
	226	}