[deliverable/linux.git] / drivers / s390 / scsi / zfcp_qdio.c

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

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

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

static bool enable_multibuffer = 1;
module_param_named(datarouter, enable_multibuffer, bool, 0400);
MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)");

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_shutdown(adapter, 0, id);
		return;
	}
	zfcp_erp_adapter_reopen(adapter,
				ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
				ZFCP_STATUS_COMMON_ERP_FAILED, id);
}

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;

	now = get_tod_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;
}

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_qdio_handler_error(qdio, "qdireq1", qdio_err);
		return;
	}

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

	spin_lock_irq(&qdio->stat_lock);
	zfcp_qdio_account(qdio);
	spin_unlock_irq(&qdio->stat_lock);
	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;
	struct zfcp_adapter *adapter = qdio->adapter;
	int sbal_no, sbal_idx;

	if (unlikely(qdio_err)) {
		if (zfcp_adapter_multi_buffer_active(adapter)) {
			void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
			struct qdio_buffer_element *sbale;
			u64 req_id;
			u8 scount;

			memset(pl, 0,
			       ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
			sbale = qdio->res_q[idx]->element;
			req_id = (u64) sbale->addr;
			scount = min(sbale->scount + 1,
				     ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
				     /* incl. signaling SBAL */

			for (sbal_no = 0; sbal_no < scount; sbal_no++) {
				sbal_idx = (idx + sbal_no) %
					QDIO_MAX_BUFFERS_PER_Q;
				pl[sbal_no] = qdio->res_q[sbal_idx];
			}
			zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
		}
		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");
}

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->eflags |= SBAL_EFLAGS_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->sflags |= SBAL_SFLAGS0_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->sflags |= 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 == qdio->max_sbale_per_sbal - 1)
		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: zero or -EINVAL on error
 */
int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
			    struct scatterlist *sg)
{
	struct qdio_buffer_element *sbale;

	/* set storage-block type for this request */
	sbale = zfcp_qdio_sbale_req(qdio, q_req);
	sbale->sflags |= 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;
	}
	return 0;
}

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

	ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq,
		       zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 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");
	}

	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;

	spin_lock(&qdio->stat_lock);
	zfcp_qdio_account(qdio);
	spin_unlock(&qdio->stat_lock);

	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)
{
	memset(id, 0, sizeof(*id));
	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;
	if (enable_multibuffer)
		id->qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
	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);
	id->scan_threshold =
		QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
}

/**
 * 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;
	int ret;

	ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
	if (ret)
		return -ENOMEM;

	ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
	if (ret)
		goto free_req_q;

	zfcp_qdio_setup_init_data(&init_data, qdio);
	init_waitqueue_head(&qdio->req_q_wq);

	ret = qdio_allocate(&init_data);
	if (ret)
		goto free_res_q;

	return 0;

free_res_q:
	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
free_req_q:
	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
	return ret;
}

/**
 * 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_irq(&qdio->req_q_lock);
	atomic_andnot(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
	spin_unlock_irq(&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_andnot(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_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
				&qdio->adapter->status);

	if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
		atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
		qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
	} else {
		atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
		qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
	}

	qdio->max_sbale_per_req =
		ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
		- 2;
	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->eflags = SBAL_EFLAGS_LAST_ENTRY;
		sbale->sflags = 0;
		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 available SBALS / number of available SBALS */
	qdio->req_q_idx = 0;
	atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
	atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);

	if (adapter->scsi_host) {
		adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req;
		adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8;
	}

	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)
{
	if (!qdio)
		return;

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

	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
	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)) {
		kfree(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_or(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	*
a53c8fab	6	* Copyright IBM Corp. 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>
3a4c5d59	13	#include <linux/module.h>
1da177e4	14	#include "zfcp_ext.h"
34c2b712	15	#include "zfcp_qdio.h"
1da177e4	16
909ee499	17	static bool enable_multibuffer = 1;
86a9668a	18	module_param_named(datarouter, enable_multibuffer, bool, 0400);
909ee499	19	MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)");
86a9668a	20
339f4f4e CS	21	static void zfcp_qdio_handler_error(struct zfcp_qdio qdio, char id,
339f4f4e CS	22	unsigned int qdio_err)
1da177e4	23	{
564e1c86 SS	24	struct zfcp_adapter *adapter = qdio->adapter;
564e1c86 SS	25
ff3b24fa	26	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
1da177e4	27
86a9668a	28	if (qdio_err & QDIO_ERROR_SLSB_STATE) {
339f4f4e	29	zfcp_qdio_siosl(adapter);
86a9668a SS	30	zfcp_erp_adapter_shutdown(adapter, 0, id);
	31	return;
	32	}
00bab910 SS	33	zfcp_erp_adapter_reopen(adapter,
00bab910 SS	34	ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED \|
ea4a3a6a	35	ZFCP_STATUS_COMMON_ERP_FAILED, id);
1da177e4 LT	36	}
1da177e4 LT	37
5d4e2262 CS	38	static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
	39	{
	40	int i, sbal_idx;
	41
	42	for (i = first; i < first + cnt; i++) {
	43	sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
	44	memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
	45	}
	46	}
	47
94506fd1	48	/* this needs to be called prior to updating the queue fill level */
41e05a12	49	static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
94506fd1	50	{
41e05a12	51	unsigned long long now, span;
706eca49	52	int used;
94506fd1	53
1aae0560	54	now = get_tod_clock_monotonic();
41e05a12	55	span = (now - qdio->req_q_time) >> 12;
706eca49	56	used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
564e1c86 SS	57	qdio->req_q_util += used * span;
564e1c86 SS	58	qdio->req_q_time = now;
94506fd1 MP	59	}
94506fd1 MP	60
779e6e1c	61	static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
706eca49	62	int queue_no, int idx, int count,
00bab910	63	unsigned long parm)
1da177e4	64	{
564e1c86	65	struct zfcp_qdio qdio = (struct zfcp_qdio ) parm;
1da177e4	66
779e6e1c	67	if (unlikely(qdio_err)) {
339f4f4e	68	zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
00bab910 SS	69	return;
00bab910 SS	70	}
1da177e4 LT	71
1da177e4 LT	72	/* cleanup all SBALs being program-owned now */
706eca49	73	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
1da177e4	74
44a24cb3	75	spin_lock_irq(&qdio->stat_lock);
564e1c86	76	zfcp_qdio_account(qdio);
44a24cb3	77	spin_unlock_irq(&qdio->stat_lock);
706eca49	78	atomic_add(count, &qdio->req_q_free);
564e1c86	79	wake_up(&qdio->req_q_wq);
1da177e4 LT	80	}
1da177e4 LT	81
779e6e1c	82	static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
706eca49	83	int queue_no, int idx, int count,
00bab910 SS	84	unsigned long parm)
00bab910 SS	85	{
564e1c86	86	struct zfcp_qdio qdio = (struct zfcp_qdio ) parm;
86a9668a	87	struct zfcp_adapter *adapter = qdio->adapter;
86a9668a	88	int sbal_no, sbal_idx;
00bab910	89
779e6e1c	90	if (unlikely(qdio_err)) {
86a9668a	91	if (zfcp_adapter_multi_buffer_active(adapter)) {
01e60527 SM	92	void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
	93	struct qdio_buffer_element *sbale;
	94	u64 req_id;
	95	u8 scount;
	96
	97	memset(pl, 0,
	98	ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
86a9668a SS	99	sbale = qdio->res_q[idx]->element;
86a9668a SS	100	req_id = (u64) sbale->addr;
01e60527 SM	101	scount = min(sbale->scount + 1,
	102	ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
	103	/* incl. signaling SBAL */
86a9668a SS	104
	105	for (sbal_no = 0; sbal_no < scount; sbal_no++) {
	106	sbal_idx = (idx + sbal_no) %
	107	QDIO_MAX_BUFFERS_PER_Q;
	108	pl[sbal_no] = qdio->res_q[sbal_idx];
	109	}
	110	zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
	111	}
339f4f4e	112	zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
00bab910 SS	113	return;
00bab910 SS	114	}
1da177e4	115
1da177e4 LT	116	/*
	117	* go through all SBALs from input queue currently
	118	* returned by QDIO layer
	119	*/
00bab910	120	for (sbal_no = 0; sbal_no < count; sbal_no++) {
706eca49	121	sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
1da177e4	122	/* go through all SBALEs of SBAL */
564e1c86	123	zfcp_fsf_reqid_check(qdio, sbal_idx);
1da177e4 LT	124	}
	125
	126	/*
706eca49	127	* put SBALs back to response queue
1da177e4	128	*/
706eca49	129	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
ea4a3a6a	130	zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
1da177e4 LT	131	}
1da177e4 LT	132
44cc76f2	133	static struct qdio_buffer_element *
1674b405	134	zfcp_qdio_sbal_chain(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	135	{
44cc76f2	136	struct qdio_buffer_element *sbale;
1da177e4 LT	137
1da177e4 LT	138	/* set last entry flag in current SBALE of current SBAL */
564e1c86	139	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
3ec90878	140	sbale->eflags \|= SBAL_EFLAGS_LAST_ENTRY;
1da177e4 LT	141
1da177e4 LT	142	/* don't exceed last allowed SBAL */
42428f74	143	if (q_req->sbal_last == q_req->sbal_limit)
1da177e4 LT	144	return NULL;
	145
	146	/* set chaining flag in first SBALE of current SBAL */
564e1c86	147	sbale = zfcp_qdio_sbale_req(qdio, q_req);
3ec90878	148	sbale->sflags \|= SBAL_SFLAGS0_MORE_SBALS;
1da177e4 LT	149
1da177e4 LT	150	/* calculate index of next SBAL */
42428f74 SS	151	q_req->sbal_last++;
42428f74 SS	152	q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	153
1da177e4 LT	154	/* keep this requests number of SBALs up-to-date */
42428f74	155	q_req->sbal_number++;
01b04759	156	BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
1da177e4 LT	157
1da177e4 LT	158	/* start at first SBALE of new SBAL */
42428f74	159	q_req->sbale_curr = 0;
1da177e4 LT	160
1da177e4 LT	161	/* set storage-block type for new SBAL */
564e1c86	162	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
3ec90878	163	sbale->sflags \|= q_req->sbtype;
1da177e4 LT	164
	165	return sbale;
	166	}
	167
44cc76f2	168	static struct qdio_buffer_element *
1674b405	169	zfcp_qdio_sbale_next(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	170	{
86a9668a	171	if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
1674b405	172	return zfcp_qdio_sbal_chain(qdio, q_req);
42428f74	173	q_req->sbale_curr++;
564e1c86	174	return zfcp_qdio_sbale_curr(qdio, q_req);
1da177e4 LT	175	}
1da177e4 LT	176
1da177e4 LT	177	/**
1da177e4 LT	178	* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
1674b405 CS	179	* @qdio: pointer to struct zfcp_qdio
1674b405 CS	180	* @q_req: pointer to struct zfcp_qdio_req
1da177e4	181	* @sg: scatter-gather list
1da177e4	182	* @max_sbals: upper bound for number of SBALs to be used
86a9668a	183	* Returns: zero or -EINVAL on error
1da177e4	184	*/
34c2b712	185	int zfcp_qdio_sbals_from_sg(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req,
01b04759	186	struct scatterlist *sg)
1da177e4	187	{
44cc76f2	188	struct qdio_buffer_element *sbale;
1da177e4	189
00bab910	190	/* set storage-block type for this request */
564e1c86	191	sbale = zfcp_qdio_sbale_req(qdio, q_req);
3ec90878	192	sbale->sflags \|= q_req->sbtype;
1da177e4	193
00bab910	194	for (; sg; sg = sg_next(sg)) {
1674b405	195	sbale = zfcp_qdio_sbale_next(qdio, q_req);
68322984 CS	196	if (!sbale) {
68322984 CS	197	atomic_inc(&qdio->req_q_full);
706eca49 SS	198	zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
706eca49 SS	199	q_req->sbal_number);
68322984 CS	200	return -EINVAL;
68322984 CS	201	}
68322984 CS	202	sbale->addr = sg_virt(sg);
68322984 CS	203	sbale->length = sg->length;
1da177e4	204	}
86a9668a	205	return 0;
1da177e4 LT	206	}
1da177e4 LT	207
6b9e1520 CS	208	static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
6b9e1520 CS	209	{
706eca49	210	if (atomic_read(&qdio->req_q_free) \|\|
c2af7545	211	!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
6b9e1520	212	return 1;
6b9e1520 CS	213	return 0;
	214	}
	215
	216	/**
	217	* zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
	218	* @qdio: pointer to struct zfcp_qdio
	219	*
	220	* The req_q_lock must be held by the caller of this function, and
	221	* this function may only be called from process context; it will
	222	* sleep when waiting for a free sbal.
	223	*
	224	* Returns: 0 on success, -EIO if there is no free sbal after waiting.
	225	*/
	226	int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
	227	{
	228	long ret;
	229
d79ff142 MP	230	ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq,
d79ff142 MP	231	zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ);
c2af7545 CS	232
	233	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
	234	return -EIO;
	235
6b9e1520 CS	236	if (ret > 0)
6b9e1520 CS	237	return 0;
c2af7545	238
6b9e1520 CS	239	if (!ret) {
	240	atomic_inc(&qdio->req_q_full);
	241	/* assume hanging outbound queue, try queue recovery */
ea4a3a6a	242	zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
6b9e1520 CS	243	}
6b9e1520 CS	244
6b9e1520 CS	245	return -EIO;
	246	}
	247
1da177e4	248	/**
00bab910	249	* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
564e1c86	250	* @qdio: pointer to struct zfcp_qdio
34c2b712	251	* @q_req: pointer to struct zfcp_qdio_req
00bab910	252	* Returns: 0 on success, error otherwise
1da177e4	253	*/
34c2b712	254	int zfcp_qdio_send(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	255	{
21ddaa53	256	int retval;
706eca49	257	u8 sbal_number = q_req->sbal_number;
00bab910	258
44a24cb3	259	spin_lock(&qdio->stat_lock);
564e1c86	260	zfcp_qdio_account(qdio);
44a24cb3	261	spin_unlock(&qdio->stat_lock);
94506fd1	262
706eca49 SS	263	retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
	264	q_req->sbal_first, sbal_number);
	265
00bab910	266	if (unlikely(retval)) {
706eca49 SS	267	zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
706eca49 SS	268	sbal_number);
00bab910 SS	269	return retval;
	270	}
	271
	272	/* account for transferred buffers */
706eca49 SS	273	atomic_sub(sbal_number, &qdio->req_q_free);
	274	qdio->req_q_idx += sbal_number;
	275	qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
	276
00bab910	277	return 0;
1da177e4 LT	278	}
1da177e4 LT	279
564e1c86 SS	280
	281	static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
	282	struct zfcp_qdio *qdio)
	283	{
d36deae7	284	memset(id, 0, sizeof(*id));
564e1c86 SS	285	id->cdev = qdio->adapter->ccw_device;
	286	id->q_format = QDIO_ZFCP_QFMT;
	287	memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
	288	ASCEBC(id->adapter_name, 8);
dcc18f48	289	id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
86a9668a SS	290	if (enable_multibuffer)
86a9668a SS	291	id->qdr_ac \|= QDR_AC_MULTI_BUFFER_ENABLE;
564e1c86 SS	292	id->no_input_qs = 1;
	293	id->no_output_qs = 1;
	294	id->input_handler = zfcp_qdio_int_resp;
	295	id->output_handler = zfcp_qdio_int_req;
	296	id->int_parm = (unsigned long) qdio;
706eca49 SS	297	id->input_sbal_addr_array = (void **) (qdio->res_q);
706eca49 SS	298	id->output_sbal_addr_array = (void **) (qdio->req_q);
3d6c76ff JG	299	id->scan_threshold =
3d6c76ff JG	300	QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
564e1c86	301	}
dcc18f48	302
00bab910 SS	303	/**
	304	* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
	305	* @adapter: pointer to struct zfcp_adapter
	306	* Returns: -ENOMEM on memory allocation error or return value from
	307	* qdio_allocate
	308	*/
d5a282a1	309	static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
00bab910	310	{
564e1c86	311	struct qdio_initialize init_data;
852eb1aa	312	int ret;
00bab910	313
852eb1aa SO	314	ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
852eb1aa SO	315	if (ret)
00bab910 SS	316	return -ENOMEM;
00bab910 SS	317
852eb1aa SO	318	ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
	319	if (ret)
	320	goto free_req_q;
	321
564e1c86	322	zfcp_qdio_setup_init_data(&init_data, qdio);
3d63d3b4	323	init_waitqueue_head(&qdio->req_q_wq);
564e1c86	324
852eb1aa SO	325	ret = qdio_allocate(&init_data);
	326	if (ret)
	327	goto free_res_q;
	328
	329	return 0;
	330
	331	free_res_q:
	332	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
	333	free_req_q:
	334	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
	335	return ret;
00bab910 SS	336	}
	337
	338	/**
	339	* zfcp_close_qdio - close qdio queues for an adapter
564e1c86	340	* @qdio: pointer to structure zfcp_qdio
1da177e4	341	*/
564e1c86	342	void zfcp_qdio_close(struct zfcp_qdio *qdio)
1da177e4	343	{
706eca49 SS	344	struct zfcp_adapter *adapter = qdio->adapter;
706eca49 SS	345	int idx, count;
00bab910	346
706eca49	347	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
00bab910 SS	348	return;
	349
	350	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
44a24cb3	351	spin_lock_irq(&qdio->req_q_lock);
805de8f4	352	atomic_andnot(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
44a24cb3	353	spin_unlock_irq(&qdio->req_q_lock);
00bab910	354
c2af7545 CS	355	wake_up(&qdio->req_q_wq);
c2af7545 CS	356
706eca49	357	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
00bab910 SS	358
00bab910 SS	359	/* cleanup used outbound sbals */
706eca49	360	count = atomic_read(&qdio->req_q_free);
00bab910	361	if (count < QDIO_MAX_BUFFERS_PER_Q) {
706eca49	362	idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
00bab910	363	count = QDIO_MAX_BUFFERS_PER_Q - count;
706eca49	364	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
1da177e4	365	}
706eca49 SS	366	qdio->req_q_idx = 0;
706eca49 SS	367	atomic_set(&qdio->req_q_free, 0);
1da177e4 LT	368	}
1da177e4 LT	369
00bab910 SS	370	/**
00bab910 SS	371	* zfcp_qdio_open - prepare and initialize response queue
564e1c86	372	* @qdio: pointer to struct zfcp_qdio
00bab910 SS	373	* Returns: 0 on success, otherwise -EIO
00bab910 SS	374	*/
564e1c86	375	int zfcp_qdio_open(struct zfcp_qdio *qdio)
00bab910	376	{
44cc76f2	377	struct qdio_buffer_element *sbale;
564e1c86	378	struct qdio_initialize init_data;
706eca49 SS	379	struct zfcp_adapter *adapter = qdio->adapter;
706eca49 SS	380	struct ccw_device *cdev = adapter->ccw_device;
dcc18f48	381	struct qdio_ssqd_desc ssqd;
00bab910 SS	382	int cc;
00bab910 SS	383
706eca49	384	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
00bab910 SS	385	return -EIO;
00bab910 SS	386
805de8f4	387	atomic_andnot(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
339f4f4e CS	388	&qdio->adapter->status);
339f4f4e CS	389
564e1c86 SS	390	zfcp_qdio_setup_init_data(&init_data, qdio);
	391
	392	if (qdio_establish(&init_data))
ff3b24fa	393	goto failed_establish;
00bab910	394
dcc18f48 CS	395	if (qdio_get_ssqd_desc(init_data.cdev, &ssqd))
	396	goto failed_qdio;
	397
	398	if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
805de8f4	399	atomic_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
dcc18f48 CS	400	&qdio->adapter->status);
dcc18f48 CS	401
86a9668a	402	if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
805de8f4	403	atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
86a9668a SS	404	qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
86a9668a SS	405	} else {
805de8f4	406	atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
86a9668a SS	407	qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
	408	}
	409
	410	qdio->max_sbale_per_req =
	411	ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
	412	- 2;
564e1c86	413	if (qdio_activate(cdev))
00bab910	414	goto failed_qdio;
00bab910 SS	415
00bab910 SS	416	for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
706eca49	417	sbale = &(qdio->res_q[cc]->element[0]);
00bab910	418	sbale->length = 0;
3ec90878 JG	419	sbale->eflags = SBAL_EFLAGS_LAST_ENTRY;
3ec90878 JG	420	sbale->sflags = 0;
00bab910 SS	421	sbale->addr = NULL;
	422	}
	423
706eca49	424	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
00bab910	425	goto failed_qdio;
00bab910	426
25985edc	427	/* set index of first available SBALS / number of available SBALS */
706eca49 SS	428	qdio->req_q_idx = 0;
706eca49 SS	429	atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
805de8f4	430	atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
00bab910	431
86a9668a SS	432	if (adapter->scsi_host) {
	433	adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req;
	434	adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8;
	435	}
	436
00bab910 SS	437	return 0;
	438
	439	failed_qdio:
564e1c86	440	qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
ff3b24fa	441	failed_establish:
564e1c86	442	dev_err(&cdev->dev,
ff3b24fa	443	"Setting up the QDIO connection to the FCP adapter failed\n");
00bab910 SS	444	return -EIO;
00bab910 SS	445	}
d5a282a1 SS	446
	447	void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
	448	{
d5a282a1 SS	449	if (!qdio)
	450	return;
	451
	452	if (qdio->adapter->ccw_device)
	453	qdio_free(qdio->adapter->ccw_device);
	454
852eb1aa SO	455	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
852eb1aa SO	456	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
d5a282a1 SS	457	kfree(qdio);
	458	}
	459
	460	int zfcp_qdio_setup(struct zfcp_adapter *adapter)
	461	{
	462	struct zfcp_qdio *qdio;
	463
	464	qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
	465	if (!qdio)
	466	return -ENOMEM;
	467
	468	qdio->adapter = adapter;
	469
	470	if (zfcp_qdio_allocate(qdio)) {
852eb1aa	471	kfree(qdio);
d5a282a1 SS	472	return -ENOMEM;
	473	}
	474
	475	spin_lock_init(&qdio->req_q_lock);
	476	spin_lock_init(&qdio->stat_lock);
	477
	478	adapter->qdio = qdio;
	479	return 0;
	480	}
	481
339f4f4e CS	482	/**
	483	* zfcp_qdio_siosl - Trigger logging in FCP channel
	484	* @adapter: The zfcp_adapter where to trigger logging
	485	*
	486	* Call the cio siosl function to trigger hardware logging. This
	487	* wrapper function sets a flag to ensure hardware logging is only
	488	* triggered once before going through qdio shutdown.
	489	*
	490	* The triggers are always run from qdio tasklet context, so no
	491	* additional synchronization is necessary.
	492	*/
	493	void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
	494	{
	495	int rc;
	496
	497	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
	498	return;
	499
	500	rc = ccw_device_siosl(adapter->ccw_device);
	501	if (!rc)
805de8f4	502	atomic_or(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
339f4f4e CS	503	&adapter->status);
339f4f4e CS	504	}