[linux-2.6-block.git] / drivers / s390 / scsi / zfcp_qdio.c

/*
 * zfcp device driver
 *
 * Setup and helper functions to access QDIO.
 *
 * Copyright IBM Corporation 2002, 2010
 */

#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/slab.h>
#include "zfcp_ext.h"
#include "zfcp_qdio.h"

#define QBUFF_PER_PAGE		(PAGE_SIZE / sizeof(struct qdio_buffer))

static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
{
	int pos;

	for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
		sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
		if (!sbal[pos])
			return -ENOMEM;
	}
	for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
		if (pos % QBUFF_PER_PAGE)
			sbal[pos] = sbal[pos - 1] + 1;
	return 0;
}

static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id,
				    unsigned int qdio_err)
{
	struct zfcp_adapter *adapter = qdio->adapter;

	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");

	if (qdio_err & QDIO_ERROR_SLSB_STATE)
		zfcp_qdio_siosl(adapter);
	zfcp_erp_adapter_reopen(adapter,
				ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
				ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
}

static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
{
	int i, sbal_idx;

	for (i = first; i < first + cnt; i++) {
		sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
		memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
	}
}

/* this needs to be called prior to updating the queue fill level */
static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
{
	unsigned long long now, span;
	int used;

	spin_lock(&qdio->stat_lock);
	now = get_clock_monotonic();
	span = (now - qdio->req_q_time) >> 12;
	used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
	qdio->req_q_util += used * span;
	qdio->req_q_time = now;
	spin_unlock(&qdio->stat_lock);
}

static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
			      int queue_no, int idx, int count,
			      unsigned long parm)
{
	struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;

	if (unlikely(qdio_err)) {
		zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
		zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
		return;
	}

	/* cleanup all SBALs being program-owned now */
	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);

	zfcp_qdio_account(qdio);
	atomic_add(count, &qdio->req_q_free);
	wake_up(&qdio->req_q_wq);
}

static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
			       int queue_no, int idx, int count,
			       unsigned long parm)
{
	struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
	int sbal_idx, sbal_no;

	if (unlikely(qdio_err)) {
		zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
		zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
		return;
	}

	/*
	 * go through all SBALs from input queue currently
	 * returned by QDIO layer
	 */
	for (sbal_no = 0; sbal_no < count; sbal_no++) {
		sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
		/* go through all SBALEs of SBAL */
		zfcp_fsf_reqid_check(qdio, sbal_idx);
	}

	/*
	 * put SBALs back to response queue
	 */
	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
		zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2", NULL);
}

static struct qdio_buffer_element *
zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
	struct qdio_buffer_element *sbale;

	/* set last entry flag in current SBALE of current SBAL */
	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
	sbale->flags |= SBAL_FLAGS_LAST_ENTRY;

	/* don't exceed last allowed SBAL */
	if (q_req->sbal_last == q_req->sbal_limit)
		return NULL;

	/* set chaining flag in first SBALE of current SBAL */
	sbale = zfcp_qdio_sbale_req(qdio, q_req);
	sbale->flags |= SBAL_FLAGS0_MORE_SBALS;

	/* calculate index of next SBAL */
	q_req->sbal_last++;
	q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;

	/* keep this requests number of SBALs up-to-date */
	q_req->sbal_number++;
	BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);

	/* start at first SBALE of new SBAL */
	q_req->sbale_curr = 0;

	/* set storage-block type for new SBAL */
	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
	sbale->flags |= q_req->sbtype;

	return sbale;
}

static struct qdio_buffer_element *
zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
	if (q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL)
		return zfcp_qdio_sbal_chain(qdio, q_req);
	q_req->sbale_curr++;
	return zfcp_qdio_sbale_curr(qdio, q_req);
}

/**
 * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
 * @qdio: pointer to struct zfcp_qdio
 * @q_req: pointer to struct zfcp_qdio_req
 * @sg: scatter-gather list
 * @max_sbals: upper bound for number of SBALs to be used
 * Returns: number of bytes, or error (negativ)
 */
int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
			    struct scatterlist *sg)
{
	struct qdio_buffer_element *sbale;
	int bytes = 0;

	/* set storage-block type for this request */
	sbale = zfcp_qdio_sbale_req(qdio, q_req);
	sbale->flags |= q_req->sbtype;

	for (; sg; sg = sg_next(sg)) {
		sbale = zfcp_qdio_sbale_next(qdio, q_req);
		if (!sbale) {
			atomic_inc(&qdio->req_q_full);
			zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
					     q_req->sbal_number);
			return -EINVAL;
		}

		sbale->addr = sg_virt(sg);
		sbale->length = sg->length;

		bytes += sg->length;
	}

	return bytes;
}

static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
{
	spin_lock_bh(&qdio->req_q_lock);
	if (atomic_read(&qdio->req_q_free) ||
	    !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
		return 1;
	spin_unlock_bh(&qdio->req_q_lock);
	return 0;
}

/**
 * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
 * @qdio: pointer to struct zfcp_qdio
 *
 * The req_q_lock must be held by the caller of this function, and
 * this function may only be called from process context; it will
 * sleep when waiting for a free sbal.
 *
 * Returns: 0 on success, -EIO if there is no free sbal after waiting.
 */
int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
{
	long ret;

	spin_unlock_bh(&qdio->req_q_lock);
	ret = wait_event_interruptible_timeout(qdio->req_q_wq,
			       zfcp_qdio_sbal_check(qdio), 5 * HZ);

	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
		return -EIO;

	if (ret > 0)
		return 0;

	if (!ret) {
		atomic_inc(&qdio->req_q_full);
		/* assume hanging outbound queue, try queue recovery */
		zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1", NULL);
	}

	spin_lock_bh(&qdio->req_q_lock);
	return -EIO;
}

/**
 * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
 * @qdio: pointer to struct zfcp_qdio
 * @q_req: pointer to struct zfcp_qdio_req
 * Returns: 0 on success, error otherwise
 */
int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
	int retval;
	u8 sbal_number = q_req->sbal_number;

	zfcp_qdio_account(qdio);

	retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
			 q_req->sbal_first, sbal_number);

	if (unlikely(retval)) {
		zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
				     sbal_number);
		return retval;
	}

	/* account for transferred buffers */
	atomic_sub(sbal_number, &qdio->req_q_free);
	qdio->req_q_idx += sbal_number;
	qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;

	return 0;
}


static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
				      struct zfcp_qdio *qdio)
{

	id->cdev = qdio->adapter->ccw_device;
	id->q_format = QDIO_ZFCP_QFMT;
	memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
	ASCEBC(id->adapter_name, 8);
	id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
	id->qib_param_field_format = 0;
	id->qib_param_field = NULL;
	id->input_slib_elements = NULL;
	id->output_slib_elements = NULL;
	id->no_input_qs = 1;
	id->no_output_qs = 1;
	id->input_handler = zfcp_qdio_int_resp;
	id->output_handler = zfcp_qdio_int_req;
	id->int_parm = (unsigned long) qdio;
	id->input_sbal_addr_array = (void **) (qdio->res_q);
	id->output_sbal_addr_array = (void **) (qdio->req_q);
}

/**
 * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
 * @adapter: pointer to struct zfcp_adapter
 * Returns: -ENOMEM on memory allocation error or return value from
 *          qdio_allocate
 */
static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
{
	struct qdio_initialize init_data;

	if (zfcp_qdio_buffers_enqueue(qdio->req_q) ||
	    zfcp_qdio_buffers_enqueue(qdio->res_q))
		return -ENOMEM;

	zfcp_qdio_setup_init_data(&init_data, qdio);

	return qdio_allocate(&init_data);
}

/**
 * zfcp_close_qdio - close qdio queues for an adapter
 * @qdio: pointer to structure zfcp_qdio
 */
void zfcp_qdio_close(struct zfcp_qdio *qdio)
{
	struct zfcp_adapter *adapter = qdio->adapter;
	int idx, count;

	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
		return;

	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
	spin_lock_bh(&qdio->req_q_lock);
	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
	spin_unlock_bh(&qdio->req_q_lock);

	wake_up(&qdio->req_q_wq);

	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);

	/* cleanup used outbound sbals */
	count = atomic_read(&qdio->req_q_free);
	if (count < QDIO_MAX_BUFFERS_PER_Q) {
		idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
		count = QDIO_MAX_BUFFERS_PER_Q - count;
		zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
	}
	qdio->req_q_idx = 0;
	atomic_set(&qdio->req_q_free, 0);
}

/**
 * zfcp_qdio_open - prepare and initialize response queue
 * @qdio: pointer to struct zfcp_qdio
 * Returns: 0 on success, otherwise -EIO
 */
int zfcp_qdio_open(struct zfcp_qdio *qdio)
{
	struct qdio_buffer_element *sbale;
	struct qdio_initialize init_data;
	struct zfcp_adapter *adapter = qdio->adapter;
	struct ccw_device *cdev = adapter->ccw_device;
	struct qdio_ssqd_desc ssqd;
	int cc;

	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
		return -EIO;

	atomic_clear_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
			  &qdio->adapter->status);

	zfcp_qdio_setup_init_data(&init_data, qdio);

	if (qdio_establish(&init_data))
		goto failed_establish;

	if (qdio_get_ssqd_desc(init_data.cdev, &ssqd))
		goto failed_qdio;

	if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
		atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
				&qdio->adapter->status);

	if (qdio_activate(cdev))
		goto failed_qdio;

	for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
		sbale = &(qdio->res_q[cc]->element[0]);
		sbale->length = 0;
		sbale->flags = SBAL_FLAGS_LAST_ENTRY;
		sbale->addr = NULL;
	}

	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
		goto failed_qdio;

	/* set index of first avalable SBALS / number of available SBALS */
	qdio->req_q_idx = 0;
	atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);

	return 0;

failed_qdio:
	qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
failed_establish:
	dev_err(&cdev->dev,
		"Setting up the QDIO connection to the FCP adapter failed\n");
	return -EIO;
}

void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
{
	int p;

	if (!qdio)
		return;

	if (qdio->adapter->ccw_device)
		qdio_free(qdio->adapter->ccw_device);

	for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
		free_page((unsigned long) qdio->req_q[p]);
		free_page((unsigned long) qdio->res_q[p]);
	}

	kfree(qdio);
}

int zfcp_qdio_setup(struct zfcp_adapter *adapter)
{
	struct zfcp_qdio *qdio;

	qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
	if (!qdio)
		return -ENOMEM;

	qdio->adapter = adapter;

	if (zfcp_qdio_allocate(qdio)) {
		zfcp_qdio_destroy(qdio);
		return -ENOMEM;
	}

	spin_lock_init(&qdio->req_q_lock);
	spin_lock_init(&qdio->stat_lock);

	adapter->qdio = qdio;
	return 0;
}

/**
 * zfcp_qdio_siosl - Trigger logging in FCP channel
 * @adapter: The zfcp_adapter where to trigger logging
 *
 * Call the cio siosl function to trigger hardware logging.  This
 * wrapper function sets a flag to ensure hardware logging is only
 * triggered once before going through qdio shutdown.
 *
 * The triggers are always run from qdio tasklet context, so no
 * additional synchronization is necessary.
 */
void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
{
	int rc;

	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
		return;

	rc = ccw_device_siosl(adapter->ccw_device);
	if (!rc)
		atomic_set_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
				&adapter->status);
}
Commit	Line	Data
1da177e4	1	/*
00bab910	2	* zfcp device driver
1da177e4	3	*
00bab910	4	* Setup and helper functions to access QDIO.
1da177e4	5	*
1674b405	6	* Copyright IBM Corporation 2002, 2010
1da177e4 LT	7	*/
1da177e4 LT	8
ecf39d42 CS	9	#define KMSG_COMPONENT "zfcp"
	10	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	11
5a0e3ad6	12	#include <linux/slab.h>
1da177e4	13	#include "zfcp_ext.h"
34c2b712	14	#include "zfcp_qdio.h"
1da177e4	15
5d4e2262	16	#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
1da177e4	17
00bab910	18	static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
1da177e4	19	{
b4e44590	20	int pos;
1da177e4	21
b4e44590	22	for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
00bab910 SS	23	sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
00bab910 SS	24	if (!sbal[pos])
b4e44590	25	return -ENOMEM;
b4e44590 SS	26	}
	27	for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
	28	if (pos % QBUFF_PER_PAGE)
00bab910	29	sbal[pos] = sbal[pos - 1] + 1;
b4e44590	30	return 0;
1da177e4 LT	31	}
1da177e4 LT	32
339f4f4e CS	33	static void zfcp_qdio_handler_error(struct zfcp_qdio qdio, char id,
339f4f4e CS	34	unsigned int qdio_err)
1da177e4	35	{
564e1c86 SS	36	struct zfcp_adapter *adapter = qdio->adapter;
564e1c86 SS	37
ff3b24fa	38	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
1da177e4	39
339f4f4e CS	40	if (qdio_err & QDIO_ERROR_SLSB_STATE)
339f4f4e CS	41	zfcp_qdio_siosl(adapter);
00bab910 SS	42	zfcp_erp_adapter_reopen(adapter,
	43	ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED \|
	44	ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
1da177e4 LT	45	}
1da177e4 LT	46
5d4e2262 CS	47	static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
	48	{
	49	int i, sbal_idx;
	50
	51	for (i = first; i < first + cnt; i++) {
	52	sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
	53	memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
	54	}
	55	}
	56
94506fd1	57	/* this needs to be called prior to updating the queue fill level */
41e05a12	58	static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
94506fd1	59	{
41e05a12	60	unsigned long long now, span;
706eca49	61	int used;
94506fd1	62
564e1c86	63	spin_lock(&qdio->stat_lock);
41e05a12 HC	64	now = get_clock_monotonic();
41e05a12 HC	65	span = (now - qdio->req_q_time) >> 12;
706eca49	66	used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
564e1c86 SS	67	qdio->req_q_util += used * span;
	68	qdio->req_q_time = now;
	69	spin_unlock(&qdio->stat_lock);
94506fd1 MP	70	}
94506fd1 MP	71
779e6e1c	72	static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
706eca49	73	int queue_no, int idx, int count,
00bab910	74	unsigned long parm)
1da177e4	75	{
564e1c86	76	struct zfcp_qdio qdio = (struct zfcp_qdio ) parm;
1da177e4	77
779e6e1c	78	if (unlikely(qdio_err)) {
706eca49	79	zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
339f4f4e	80	zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
00bab910 SS	81	return;
00bab910 SS	82	}
1da177e4 LT	83
1da177e4 LT	84	/* cleanup all SBALs being program-owned now */
706eca49	85	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
1da177e4	86
564e1c86	87	zfcp_qdio_account(qdio);
706eca49	88	atomic_add(count, &qdio->req_q_free);
564e1c86	89	wake_up(&qdio->req_q_wq);
1da177e4 LT	90	}
1da177e4 LT	91
779e6e1c	92	static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
706eca49	93	int queue_no, int idx, int count,
00bab910 SS	94	unsigned long parm)
00bab910 SS	95	{
564e1c86	96	struct zfcp_qdio qdio = (struct zfcp_qdio ) parm;
bd63eaf4	97	int sbal_idx, sbal_no;
00bab910	98
779e6e1c	99	if (unlikely(qdio_err)) {
706eca49	100	zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
339f4f4e	101	zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
00bab910 SS	102	return;
00bab910 SS	103	}
1da177e4	104
1da177e4 LT	105	/*
	106	* go through all SBALs from input queue currently
	107	* returned by QDIO layer
	108	*/
00bab910	109	for (sbal_no = 0; sbal_no < count; sbal_no++) {
706eca49	110	sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
1da177e4	111	/* go through all SBALEs of SBAL */
564e1c86	112	zfcp_fsf_reqid_check(qdio, sbal_idx);
1da177e4 LT	113	}
	114
	115	/*
706eca49	116	* put SBALs back to response queue
1da177e4	117	*/
706eca49 SS	118	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
706eca49 SS	119	zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2", NULL);
1da177e4 LT	120	}
1da177e4 LT	121
44cc76f2	122	static struct qdio_buffer_element *
1674b405	123	zfcp_qdio_sbal_chain(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	124	{
44cc76f2	125	struct qdio_buffer_element *sbale;
1da177e4 LT	126
1da177e4 LT	127	/* set last entry flag in current SBALE of current SBAL */
564e1c86	128	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
1da177e4 LT	129	sbale->flags \|= SBAL_FLAGS_LAST_ENTRY;
	130
	131	/* don't exceed last allowed SBAL */
42428f74	132	if (q_req->sbal_last == q_req->sbal_limit)
1da177e4 LT	133	return NULL;
	134
	135	/* set chaining flag in first SBALE of current SBAL */
564e1c86	136	sbale = zfcp_qdio_sbale_req(qdio, q_req);
1da177e4 LT	137	sbale->flags \|= SBAL_FLAGS0_MORE_SBALS;
	138
	139	/* calculate index of next SBAL */
42428f74 SS	140	q_req->sbal_last++;
42428f74 SS	141	q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	142
1da177e4 LT	143	/* keep this requests number of SBALs up-to-date */
42428f74	144	q_req->sbal_number++;
01b04759	145	BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
1da177e4 LT	146
1da177e4 LT	147	/* start at first SBALE of new SBAL */
42428f74	148	q_req->sbale_curr = 0;
1da177e4 LT	149
1da177e4 LT	150	/* set storage-block type for new SBAL */
564e1c86	151	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
1674b405	152	sbale->flags \|= q_req->sbtype;
1da177e4 LT	153
	154	return sbale;
	155	}
	156
44cc76f2	157	static struct qdio_buffer_element *
1674b405	158	zfcp_qdio_sbale_next(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	159	{
1674b405 CS	160	if (q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL)
1674b405 CS	161	return zfcp_qdio_sbal_chain(qdio, q_req);
42428f74	162	q_req->sbale_curr++;
564e1c86	163	return zfcp_qdio_sbale_curr(qdio, q_req);
1da177e4 LT	164	}
1da177e4 LT	165
1da177e4 LT	166	/**
1da177e4 LT	167	* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
1674b405 CS	168	* @qdio: pointer to struct zfcp_qdio
1674b405 CS	169	* @q_req: pointer to struct zfcp_qdio_req
1da177e4	170	* @sg: scatter-gather list
1da177e4	171	* @max_sbals: upper bound for number of SBALs to be used
00bab910	172	* Returns: number of bytes, or error (negativ)
1da177e4	173	*/
34c2b712	174	int zfcp_qdio_sbals_from_sg(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req,
01b04759	175	struct scatterlist *sg)
1da177e4	176	{
44cc76f2	177	struct qdio_buffer_element *sbale;
68322984	178	int bytes = 0;
1da177e4	179
00bab910	180	/* set storage-block type for this request */
564e1c86	181	sbale = zfcp_qdio_sbale_req(qdio, q_req);
1674b405	182	sbale->flags \|= q_req->sbtype;
1da177e4	183
00bab910	184	for (; sg; sg = sg_next(sg)) {
1674b405	185	sbale = zfcp_qdio_sbale_next(qdio, q_req);
68322984 CS	186	if (!sbale) {
68322984 CS	187	atomic_inc(&qdio->req_q_full);
706eca49 SS	188	zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
706eca49 SS	189	q_req->sbal_number);
68322984 CS	190	return -EINVAL;
	191	}
	192
	193	sbale->addr = sg_virt(sg);
	194	sbale->length = sg->length;
	195
00bab910	196	bytes += sg->length;
1da177e4	197	}
00bab910	198
1da177e4 LT	199	return bytes;
	200	}
	201
6b9e1520 CS	202	static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
6b9e1520 CS	203	{
6b9e1520	204	spin_lock_bh(&qdio->req_q_lock);
706eca49	205	if (atomic_read(&qdio->req_q_free) \|\|
c2af7545	206	!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
6b9e1520 CS	207	return 1;
	208	spin_unlock_bh(&qdio->req_q_lock);
	209	return 0;
	210	}
	211
	212	/**
	213	* zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
	214	* @qdio: pointer to struct zfcp_qdio
	215	*
	216	* The req_q_lock must be held by the caller of this function, and
	217	* this function may only be called from process context; it will
	218	* sleep when waiting for a free sbal.
	219	*
	220	* Returns: 0 on success, -EIO if there is no free sbal after waiting.
	221	*/
	222	int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
	223	{
	224	long ret;
	225
	226	spin_unlock_bh(&qdio->req_q_lock);
	227	ret = wait_event_interruptible_timeout(qdio->req_q_wq,
	228	zfcp_qdio_sbal_check(qdio), 5 * HZ);
c2af7545 CS	229
	230	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
	231	return -EIO;
	232
6b9e1520 CS	233	if (ret > 0)
6b9e1520 CS	234	return 0;
c2af7545	235
6b9e1520 CS	236	if (!ret) {
	237	atomic_inc(&qdio->req_q_full);
	238	/* assume hanging outbound queue, try queue recovery */
	239	zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1", NULL);
	240	}
	241
	242	spin_lock_bh(&qdio->req_q_lock);
	243	return -EIO;
	244	}
	245
1da177e4	246	/**
00bab910	247	* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
564e1c86	248	* @qdio: pointer to struct zfcp_qdio
34c2b712	249	* @q_req: pointer to struct zfcp_qdio_req
00bab910	250	* Returns: 0 on success, error otherwise
1da177e4	251	*/
34c2b712	252	int zfcp_qdio_send(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	253	{
21ddaa53	254	int retval;
706eca49	255	u8 sbal_number = q_req->sbal_number;
00bab910	256
564e1c86	257	zfcp_qdio_account(qdio);
94506fd1	258
706eca49 SS	259	retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
	260	q_req->sbal_first, sbal_number);
	261
00bab910	262	if (unlikely(retval)) {
706eca49 SS	263	zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
706eca49 SS	264	sbal_number);
00bab910 SS	265	return retval;
	266	}
	267
	268	/* account for transferred buffers */
706eca49 SS	269	atomic_sub(sbal_number, &qdio->req_q_free);
	270	qdio->req_q_idx += sbal_number;
	271	qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
	272
00bab910	273	return 0;
1da177e4 LT	274	}
1da177e4 LT	275
564e1c86 SS	276
	277	static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
	278	struct zfcp_qdio *qdio)
	279	{
	280
	281	id->cdev = qdio->adapter->ccw_device;
	282	id->q_format = QDIO_ZFCP_QFMT;
	283	memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
	284	ASCEBC(id->adapter_name, 8);
dcc18f48	285	id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
564e1c86 SS	286	id->qib_param_field_format = 0;
	287	id->qib_param_field = NULL;
	288	id->input_slib_elements = NULL;
	289	id->output_slib_elements = NULL;
	290	id->no_input_qs = 1;
	291	id->no_output_qs = 1;
	292	id->input_handler = zfcp_qdio_int_resp;
	293	id->output_handler = zfcp_qdio_int_req;
	294	id->int_parm = (unsigned long) qdio;
706eca49 SS	295	id->input_sbal_addr_array = (void **) (qdio->res_q);
706eca49 SS	296	id->output_sbal_addr_array = (void **) (qdio->req_q);
564e1c86	297	}
dcc18f48	298
00bab910 SS	299	/**
	300	* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
	301	* @adapter: pointer to struct zfcp_adapter
	302	* Returns: -ENOMEM on memory allocation error or return value from
	303	* qdio_allocate
	304	*/
d5a282a1	305	static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
00bab910	306	{
564e1c86	307	struct qdio_initialize init_data;
00bab910	308
706eca49 SS	309	if (zfcp_qdio_buffers_enqueue(qdio->req_q) \|\|
706eca49 SS	310	zfcp_qdio_buffers_enqueue(qdio->res_q))
00bab910 SS	311	return -ENOMEM;
00bab910 SS	312
564e1c86 SS	313	zfcp_qdio_setup_init_data(&init_data, qdio);
	314
	315	return qdio_allocate(&init_data);
00bab910 SS	316	}
	317
	318	/**
	319	* zfcp_close_qdio - close qdio queues for an adapter
564e1c86	320	* @qdio: pointer to structure zfcp_qdio
1da177e4	321	*/
564e1c86	322	void zfcp_qdio_close(struct zfcp_qdio *qdio)
1da177e4	323	{
706eca49 SS	324	struct zfcp_adapter *adapter = qdio->adapter;
706eca49 SS	325	int idx, count;
00bab910	326
706eca49	327	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
00bab910 SS	328	return;
	329
	330	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
564e1c86	331	spin_lock_bh(&qdio->req_q_lock);
706eca49	332	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
564e1c86	333	spin_unlock_bh(&qdio->req_q_lock);
00bab910	334
c2af7545 CS	335	wake_up(&qdio->req_q_wq);
c2af7545 CS	336
706eca49	337	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
00bab910 SS	338
00bab910 SS	339	/* cleanup used outbound sbals */
706eca49	340	count = atomic_read(&qdio->req_q_free);
00bab910	341	if (count < QDIO_MAX_BUFFERS_PER_Q) {
706eca49	342	idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
00bab910	343	count = QDIO_MAX_BUFFERS_PER_Q - count;
706eca49	344	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
1da177e4	345	}
706eca49 SS	346	qdio->req_q_idx = 0;
706eca49 SS	347	atomic_set(&qdio->req_q_free, 0);
1da177e4 LT	348	}
1da177e4 LT	349
00bab910 SS	350	/**
00bab910 SS	351	* zfcp_qdio_open - prepare and initialize response queue
564e1c86	352	* @qdio: pointer to struct zfcp_qdio
00bab910 SS	353	* Returns: 0 on success, otherwise -EIO
00bab910 SS	354	*/
564e1c86	355	int zfcp_qdio_open(struct zfcp_qdio *qdio)
00bab910	356	{
44cc76f2	357	struct qdio_buffer_element *sbale;
564e1c86	358	struct qdio_initialize init_data;
706eca49 SS	359	struct zfcp_adapter *adapter = qdio->adapter;
706eca49 SS	360	struct ccw_device *cdev = adapter->ccw_device;
dcc18f48	361	struct qdio_ssqd_desc ssqd;
00bab910 SS	362	int cc;
00bab910 SS	363
706eca49	364	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
00bab910 SS	365	return -EIO;
00bab910 SS	366
339f4f4e CS	367	atomic_clear_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
	368	&qdio->adapter->status);
	369
564e1c86 SS	370	zfcp_qdio_setup_init_data(&init_data, qdio);
	371
	372	if (qdio_establish(&init_data))
ff3b24fa	373	goto failed_establish;
00bab910	374
dcc18f48 CS	375	if (qdio_get_ssqd_desc(init_data.cdev, &ssqd))
	376	goto failed_qdio;
	377
	378	if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
	379	atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
	380	&qdio->adapter->status);
	381
564e1c86	382	if (qdio_activate(cdev))
00bab910	383	goto failed_qdio;
00bab910 SS	384
00bab910 SS	385	for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
706eca49	386	sbale = &(qdio->res_q[cc]->element[0]);
00bab910 SS	387	sbale->length = 0;
	388	sbale->flags = SBAL_FLAGS_LAST_ENTRY;
	389	sbale->addr = NULL;
	390	}
	391
706eca49	392	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
00bab910	393	goto failed_qdio;
00bab910 SS	394
00bab910 SS	395	/* set index of first avalable SBALS / number of available SBALS */
706eca49 SS	396	qdio->req_q_idx = 0;
706eca49 SS	397	atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
00bab910 SS	398
	399	return 0;
	400
	401	failed_qdio:
564e1c86	402	qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
ff3b24fa	403	failed_establish:
564e1c86	404	dev_err(&cdev->dev,
ff3b24fa	405	"Setting up the QDIO connection to the FCP adapter failed\n");
00bab910 SS	406	return -EIO;
00bab910 SS	407	}
d5a282a1 SS	408
	409	void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
	410	{
d5a282a1 SS	411	int p;
	412
	413	if (!qdio)
	414	return;
	415
	416	if (qdio->adapter->ccw_device)
	417	qdio_free(qdio->adapter->ccw_device);
	418
d5a282a1	419	for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
706eca49 SS	420	free_page((unsigned long) qdio->req_q[p]);
706eca49 SS	421	free_page((unsigned long) qdio->res_q[p]);
d5a282a1 SS	422	}
	423
	424	kfree(qdio);
	425	}
	426
	427	int zfcp_qdio_setup(struct zfcp_adapter *adapter)
	428	{
	429	struct zfcp_qdio *qdio;
	430
	431	qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
	432	if (!qdio)
	433	return -ENOMEM;
	434
	435	qdio->adapter = adapter;
	436
	437	if (zfcp_qdio_allocate(qdio)) {
	438	zfcp_qdio_destroy(qdio);
	439	return -ENOMEM;
	440	}
	441
	442	spin_lock_init(&qdio->req_q_lock);
	443	spin_lock_init(&qdio->stat_lock);
	444
	445	adapter->qdio = qdio;
	446	return 0;
	447	}
	448
339f4f4e CS	449	/**
	450	* zfcp_qdio_siosl - Trigger logging in FCP channel
	451	* @adapter: The zfcp_adapter where to trigger logging
	452	*
	453	* Call the cio siosl function to trigger hardware logging. This
	454	* wrapper function sets a flag to ensure hardware logging is only
	455	* triggered once before going through qdio shutdown.
	456	*
	457	* The triggers are always run from qdio tasklet context, so no
	458	* additional synchronization is necessary.
	459	*/
	460	void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
	461	{
	462	int rc;
	463
	464	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
	465	return;
	466
	467	rc = ccw_device_siosl(adapter->ccw_device);
	468	if (!rc)
	469	atomic_set_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
	470	&adapter->status);
	471	}