[mirror_ubuntu-zesty-kernel.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"

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

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

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_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_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;
	struct qdio_buffer_element *sbale;
	int sbal_no, sbal_idx;
	void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
	u64 req_id;
	u8 scount;

	if (unlikely(qdio_err)) {
		memset(pl, 0, ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
		if (zfcp_adapter_multi_buffer_active(adapter)) {
			sbale = qdio->res_q[idx]->element;
			req_id = (u64) sbale->addr;
			scount = sbale->scount + 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)
{
	spin_lock_irq(&qdio->req_q_lock);
	if (atomic_read(&qdio->req_q_free) ||
	    !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
		return 1;
	spin_unlock_irq(&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_irq(&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");
	}

	spin_lock_irq(&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;

	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;

	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);
	init_waitqueue_head(&qdio->req_q_wq);

	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_irq(&qdio->req_q_lock);
	atomic_clear_mask(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_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 (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
		atomic_set_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
		qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
	} else {
		atomic_clear_mask(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_set_mask(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)
{
	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	*
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
5d4e2262	17	#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
1da177e4	18
86a9668a SS	19	static bool enable_multibuffer;
	20	module_param_named(datarouter, enable_multibuffer, bool, 0400);
	21	MODULE_PARM_DESC(datarouter, "Enable hardware data router support");
	22
00bab910	23	static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
1da177e4	24	{
b4e44590	25	int pos;
1da177e4	26
b4e44590	27	for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
00bab910 SS	28	sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
00bab910 SS	29	if (!sbal[pos])
b4e44590	30	return -ENOMEM;
b4e44590 SS	31	}
	32	for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
	33	if (pos % QBUFF_PER_PAGE)
00bab910	34	sbal[pos] = sbal[pos - 1] + 1;
b4e44590	35	return 0;
1da177e4 LT	36	}
1da177e4 LT	37
339f4f4e CS	38	static void zfcp_qdio_handler_error(struct zfcp_qdio qdio, char id,
339f4f4e CS	39	unsigned int qdio_err)
1da177e4	40	{
564e1c86 SS	41	struct zfcp_adapter *adapter = qdio->adapter;
564e1c86 SS	42
ff3b24fa	43	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
1da177e4	44
86a9668a	45	if (qdio_err & QDIO_ERROR_SLSB_STATE) {
339f4f4e	46	zfcp_qdio_siosl(adapter);
86a9668a SS	47	zfcp_erp_adapter_shutdown(adapter, 0, id);
	48	return;
	49	}
00bab910 SS	50	zfcp_erp_adapter_reopen(adapter,
00bab910 SS	51	ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED \|
ea4a3a6a	52	ZFCP_STATUS_COMMON_ERP_FAILED, id);
1da177e4 LT	53	}
1da177e4 LT	54
5d4e2262 CS	55	static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
	56	{
	57	int i, sbal_idx;
	58
	59	for (i = first; i < first + cnt; i++) {
	60	sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
	61	memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
	62	}
	63	}
	64
94506fd1	65	/* this needs to be called prior to updating the queue fill level */
41e05a12	66	static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
94506fd1	67	{
41e05a12	68	unsigned long long now, span;
706eca49	69	int used;
94506fd1	70
41e05a12 HC	71	now = get_clock_monotonic();
41e05a12 HC	72	span = (now - qdio->req_q_time) >> 12;
706eca49	73	used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
564e1c86 SS	74	qdio->req_q_util += used * span;
564e1c86 SS	75	qdio->req_q_time = now;
94506fd1 MP	76	}
94506fd1 MP	77
779e6e1c	78	static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
706eca49	79	int queue_no, int idx, int count,
00bab910	80	unsigned long parm)
1da177e4	81	{
564e1c86	82	struct zfcp_qdio qdio = (struct zfcp_qdio ) parm;
1da177e4	83
779e6e1c	84	if (unlikely(qdio_err)) {
339f4f4e	85	zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
00bab910 SS	86	return;
00bab910 SS	87	}
1da177e4 LT	88
1da177e4 LT	89	/* cleanup all SBALs being program-owned now */
706eca49	90	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
1da177e4	91
44a24cb3	92	spin_lock_irq(&qdio->stat_lock);
564e1c86	93	zfcp_qdio_account(qdio);
44a24cb3	94	spin_unlock_irq(&qdio->stat_lock);
706eca49	95	atomic_add(count, &qdio->req_q_free);
564e1c86	96	wake_up(&qdio->req_q_wq);
1da177e4 LT	97	}
1da177e4 LT	98
779e6e1c	99	static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
706eca49	100	int queue_no, int idx, int count,
00bab910 SS	101	unsigned long parm)
00bab910 SS	102	{
564e1c86	103	struct zfcp_qdio qdio = (struct zfcp_qdio ) parm;
86a9668a SS	104	struct zfcp_adapter *adapter = qdio->adapter;
	105	struct qdio_buffer_element *sbale;
	106	int sbal_no, sbal_idx;
	107	void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
	108	u64 req_id;
	109	u8 scount;
00bab910	110
779e6e1c	111	if (unlikely(qdio_err)) {
86a9668a SS	112	memset(pl, 0, ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
	113	if (zfcp_adapter_multi_buffer_active(adapter)) {
	114	sbale = qdio->res_q[idx]->element;
	115	req_id = (u64) sbale->addr;
	116	scount = sbale->scount + 1; /* incl. signaling SBAL */
	117
	118	for (sbal_no = 0; sbal_no < scount; sbal_no++) {
	119	sbal_idx = (idx + sbal_no) %
	120	QDIO_MAX_BUFFERS_PER_Q;
	121	pl[sbal_no] = qdio->res_q[sbal_idx];
	122	}
	123	zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
	124	}
339f4f4e	125	zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
00bab910 SS	126	return;
00bab910 SS	127	}
1da177e4	128
1da177e4 LT	129	/*
	130	* go through all SBALs from input queue currently
	131	* returned by QDIO layer
	132	*/
00bab910	133	for (sbal_no = 0; sbal_no < count; sbal_no++) {
706eca49	134	sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
1da177e4	135	/* go through all SBALEs of SBAL */
564e1c86	136	zfcp_fsf_reqid_check(qdio, sbal_idx);
1da177e4 LT	137	}
	138
	139	/*
706eca49	140	* put SBALs back to response queue
1da177e4	141	*/
706eca49	142	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
ea4a3a6a	143	zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
1da177e4 LT	144	}
1da177e4 LT	145
44cc76f2	146	static struct qdio_buffer_element *
1674b405	147	zfcp_qdio_sbal_chain(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	148	{
44cc76f2	149	struct qdio_buffer_element *sbale;
1da177e4 LT	150
1da177e4 LT	151	/* set last entry flag in current SBALE of current SBAL */
564e1c86	152	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
3ec90878	153	sbale->eflags \|= SBAL_EFLAGS_LAST_ENTRY;
1da177e4 LT	154
1da177e4 LT	155	/* don't exceed last allowed SBAL */
42428f74	156	if (q_req->sbal_last == q_req->sbal_limit)
1da177e4 LT	157	return NULL;
	158
	159	/* set chaining flag in first SBALE of current SBAL */
564e1c86	160	sbale = zfcp_qdio_sbale_req(qdio, q_req);
3ec90878	161	sbale->sflags \|= SBAL_SFLAGS0_MORE_SBALS;
1da177e4 LT	162
1da177e4 LT	163	/* calculate index of next SBAL */
42428f74 SS	164	q_req->sbal_last++;
42428f74 SS	165	q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	166
1da177e4 LT	167	/* keep this requests number of SBALs up-to-date */
42428f74	168	q_req->sbal_number++;
01b04759	169	BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
1da177e4 LT	170
1da177e4 LT	171	/* start at first SBALE of new SBAL */
42428f74	172	q_req->sbale_curr = 0;
1da177e4 LT	173
1da177e4 LT	174	/* set storage-block type for new SBAL */
564e1c86	175	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
3ec90878	176	sbale->sflags \|= q_req->sbtype;
1da177e4 LT	177
	178	return sbale;
	179	}
	180
44cc76f2	181	static struct qdio_buffer_element *
1674b405	182	zfcp_qdio_sbale_next(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	183	{
86a9668a	184	if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
1674b405	185	return zfcp_qdio_sbal_chain(qdio, q_req);
42428f74	186	q_req->sbale_curr++;
564e1c86	187	return zfcp_qdio_sbale_curr(qdio, q_req);
1da177e4 LT	188	}
1da177e4 LT	189
1da177e4 LT	190	/**
1da177e4 LT	191	* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
1674b405 CS	192	* @qdio: pointer to struct zfcp_qdio
1674b405 CS	193	* @q_req: pointer to struct zfcp_qdio_req
1da177e4	194	* @sg: scatter-gather list
1da177e4	195	* @max_sbals: upper bound for number of SBALs to be used
86a9668a	196	* Returns: zero or -EINVAL on error
1da177e4	197	*/
34c2b712	198	int zfcp_qdio_sbals_from_sg(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req,
01b04759	199	struct scatterlist *sg)
1da177e4	200	{
44cc76f2	201	struct qdio_buffer_element *sbale;
1da177e4	202
00bab910	203	/* set storage-block type for this request */
564e1c86	204	sbale = zfcp_qdio_sbale_req(qdio, q_req);
3ec90878	205	sbale->sflags \|= q_req->sbtype;
1da177e4	206
00bab910	207	for (; sg; sg = sg_next(sg)) {
1674b405	208	sbale = zfcp_qdio_sbale_next(qdio, q_req);
68322984 CS	209	if (!sbale) {
68322984 CS	210	atomic_inc(&qdio->req_q_full);
706eca49 SS	211	zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
706eca49 SS	212	q_req->sbal_number);
68322984 CS	213	return -EINVAL;
68322984 CS	214	}
68322984 CS	215	sbale->addr = sg_virt(sg);
68322984 CS	216	sbale->length = sg->length;
1da177e4	217	}
86a9668a	218	return 0;
1da177e4 LT	219	}
1da177e4 LT	220
6b9e1520 CS	221	static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
6b9e1520 CS	222	{
44a24cb3	223	spin_lock_irq(&qdio->req_q_lock);
706eca49	224	if (atomic_read(&qdio->req_q_free) \|\|
c2af7545	225	!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
6b9e1520	226	return 1;
44a24cb3	227	spin_unlock_irq(&qdio->req_q_lock);
6b9e1520 CS	228	return 0;
	229	}
	230
	231	/**
	232	* zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
	233	* @qdio: pointer to struct zfcp_qdio
	234	*
	235	* The req_q_lock must be held by the caller of this function, and
	236	* this function may only be called from process context; it will
	237	* sleep when waiting for a free sbal.
	238	*
	239	* Returns: 0 on success, -EIO if there is no free sbal after waiting.
	240	*/
	241	int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
	242	{
	243	long ret;
	244
44a24cb3	245	spin_unlock_irq(&qdio->req_q_lock);
6b9e1520 CS	246	ret = wait_event_interruptible_timeout(qdio->req_q_wq,
6b9e1520 CS	247	zfcp_qdio_sbal_check(qdio), 5 * HZ);
c2af7545 CS	248
	249	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
	250	return -EIO;
	251
6b9e1520 CS	252	if (ret > 0)
6b9e1520 CS	253	return 0;
c2af7545	254
6b9e1520 CS	255	if (!ret) {
	256	atomic_inc(&qdio->req_q_full);
	257	/* assume hanging outbound queue, try queue recovery */
ea4a3a6a	258	zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
6b9e1520 CS	259	}
6b9e1520 CS	260
44a24cb3	261	spin_lock_irq(&qdio->req_q_lock);
6b9e1520 CS	262	return -EIO;
	263	}
	264
1da177e4	265	/**
00bab910	266	* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
564e1c86	267	* @qdio: pointer to struct zfcp_qdio
34c2b712	268	* @q_req: pointer to struct zfcp_qdio_req
00bab910	269	* Returns: 0 on success, error otherwise
1da177e4	270	*/
34c2b712	271	int zfcp_qdio_send(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	272	{
21ddaa53	273	int retval;
706eca49	274	u8 sbal_number = q_req->sbal_number;
00bab910	275
44a24cb3	276	spin_lock(&qdio->stat_lock);
564e1c86	277	zfcp_qdio_account(qdio);
44a24cb3	278	spin_unlock(&qdio->stat_lock);
94506fd1	279
706eca49 SS	280	retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
	281	q_req->sbal_first, sbal_number);
	282
00bab910	283	if (unlikely(retval)) {
706eca49 SS	284	zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
706eca49 SS	285	sbal_number);
00bab910 SS	286	return retval;
	287	}
	288
	289	/* account for transferred buffers */
706eca49 SS	290	atomic_sub(sbal_number, &qdio->req_q_free);
	291	qdio->req_q_idx += sbal_number;
	292	qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
	293
00bab910	294	return 0;
1da177e4 LT	295	}
1da177e4 LT	296
564e1c86 SS	297
	298	static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
	299	struct zfcp_qdio *qdio)
	300	{
d36deae7	301	memset(id, 0, sizeof(*id));
564e1c86 SS	302	id->cdev = qdio->adapter->ccw_device;
	303	id->q_format = QDIO_ZFCP_QFMT;
	304	memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
	305	ASCEBC(id->adapter_name, 8);
dcc18f48	306	id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
86a9668a SS	307	if (enable_multibuffer)
86a9668a SS	308	id->qdr_ac \|= QDR_AC_MULTI_BUFFER_ENABLE;
564e1c86 SS	309	id->no_input_qs = 1;
	310	id->no_output_qs = 1;
	311	id->input_handler = zfcp_qdio_int_resp;
	312	id->output_handler = zfcp_qdio_int_req;
	313	id->int_parm = (unsigned long) qdio;
706eca49 SS	314	id->input_sbal_addr_array = (void **) (qdio->res_q);
706eca49 SS	315	id->output_sbal_addr_array = (void **) (qdio->req_q);
3d6c76ff JG	316	id->scan_threshold =
3d6c76ff JG	317	QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
564e1c86	318	}
dcc18f48	319
00bab910 SS	320	/**
	321	* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
	322	* @adapter: pointer to struct zfcp_adapter
	323	* Returns: -ENOMEM on memory allocation error or return value from
	324	* qdio_allocate
	325	*/
d5a282a1	326	static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
00bab910	327	{
564e1c86	328	struct qdio_initialize init_data;
00bab910	329
706eca49 SS	330	if (zfcp_qdio_buffers_enqueue(qdio->req_q) \|\|
706eca49 SS	331	zfcp_qdio_buffers_enqueue(qdio->res_q))
00bab910 SS	332	return -ENOMEM;
00bab910 SS	333
564e1c86	334	zfcp_qdio_setup_init_data(&init_data, qdio);
3d63d3b4	335	init_waitqueue_head(&qdio->req_q_wq);
564e1c86 SS	336
564e1c86 SS	337	return qdio_allocate(&init_data);
00bab910 SS	338	}
	339
	340	/**
	341	* zfcp_close_qdio - close qdio queues for an adapter
564e1c86	342	* @qdio: pointer to structure zfcp_qdio
1da177e4	343	*/
564e1c86	344	void zfcp_qdio_close(struct zfcp_qdio *qdio)
1da177e4	345	{
706eca49 SS	346	struct zfcp_adapter *adapter = qdio->adapter;
706eca49 SS	347	int idx, count;
00bab910	348
706eca49	349	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
00bab910 SS	350	return;
	351
	352	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
44a24cb3	353	spin_lock_irq(&qdio->req_q_lock);
706eca49	354	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
44a24cb3	355	spin_unlock_irq(&qdio->req_q_lock);
00bab910	356
c2af7545 CS	357	wake_up(&qdio->req_q_wq);
c2af7545 CS	358
706eca49	359	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
00bab910 SS	360
00bab910 SS	361	/* cleanup used outbound sbals */
706eca49	362	count = atomic_read(&qdio->req_q_free);
00bab910	363	if (count < QDIO_MAX_BUFFERS_PER_Q) {
706eca49	364	idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
00bab910	365	count = QDIO_MAX_BUFFERS_PER_Q - count;
706eca49	366	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
1da177e4	367	}
706eca49 SS	368	qdio->req_q_idx = 0;
706eca49 SS	369	atomic_set(&qdio->req_q_free, 0);
1da177e4 LT	370	}
1da177e4 LT	371
00bab910 SS	372	/**
00bab910 SS	373	* zfcp_qdio_open - prepare and initialize response queue
564e1c86	374	* @qdio: pointer to struct zfcp_qdio
00bab910 SS	375	* Returns: 0 on success, otherwise -EIO
00bab910 SS	376	*/
564e1c86	377	int zfcp_qdio_open(struct zfcp_qdio *qdio)
00bab910	378	{
44cc76f2	379	struct qdio_buffer_element *sbale;
564e1c86	380	struct qdio_initialize init_data;
706eca49 SS	381	struct zfcp_adapter *adapter = qdio->adapter;
706eca49 SS	382	struct ccw_device *cdev = adapter->ccw_device;
dcc18f48	383	struct qdio_ssqd_desc ssqd;
00bab910 SS	384	int cc;
00bab910 SS	385
706eca49	386	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
00bab910 SS	387	return -EIO;
00bab910 SS	388
339f4f4e CS	389	atomic_clear_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
	390	&qdio->adapter->status);
	391
564e1c86 SS	392	zfcp_qdio_setup_init_data(&init_data, qdio);
	393
	394	if (qdio_establish(&init_data))
ff3b24fa	395	goto failed_establish;
00bab910	396
dcc18f48 CS	397	if (qdio_get_ssqd_desc(init_data.cdev, &ssqd))
	398	goto failed_qdio;
	399
	400	if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
	401	atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
	402	&qdio->adapter->status);
	403
86a9668a SS	404	if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
	405	atomic_set_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
	406	qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
	407	} else {
	408	atomic_clear_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
	409	qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
	410	}
	411
	412	qdio->max_sbale_per_req =
	413	ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
	414	- 2;
564e1c86	415	if (qdio_activate(cdev))
00bab910	416	goto failed_qdio;
00bab910 SS	417
00bab910 SS	418	for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
706eca49	419	sbale = &(qdio->res_q[cc]->element[0]);
00bab910	420	sbale->length = 0;
3ec90878 JG	421	sbale->eflags = SBAL_EFLAGS_LAST_ENTRY;
3ec90878 JG	422	sbale->sflags = 0;
00bab910 SS	423	sbale->addr = NULL;
	424	}
	425
706eca49	426	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
00bab910	427	goto failed_qdio;
00bab910	428
25985edc	429	/* set index of first available SBALS / number of available SBALS */
706eca49 SS	430	qdio->req_q_idx = 0;
706eca49 SS	431	atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
3d63d3b4	432	atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
00bab910	433
86a9668a SS	434	if (adapter->scsi_host) {
	435	adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req;
	436	adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8;
	437	}
	438
00bab910 SS	439	return 0;
	440
	441	failed_qdio:
564e1c86	442	qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
ff3b24fa	443	failed_establish:
564e1c86	444	dev_err(&cdev->dev,
ff3b24fa	445	"Setting up the QDIO connection to the FCP adapter failed\n");
00bab910 SS	446	return -EIO;
00bab910 SS	447	}
d5a282a1 SS	448
	449	void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
	450	{
d5a282a1 SS	451	int p;
	452
	453	if (!qdio)
	454	return;
	455
	456	if (qdio->adapter->ccw_device)
	457	qdio_free(qdio->adapter->ccw_device);
	458
d5a282a1	459	for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
706eca49 SS	460	free_page((unsigned long) qdio->req_q[p]);
706eca49 SS	461	free_page((unsigned long) qdio->res_q[p]);
d5a282a1 SS	462	}
	463
	464	kfree(qdio);
	465	}
	466
	467	int zfcp_qdio_setup(struct zfcp_adapter *adapter)
	468	{
	469	struct zfcp_qdio *qdio;
	470
	471	qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
	472	if (!qdio)
	473	return -ENOMEM;
	474
	475	qdio->adapter = adapter;
	476
	477	if (zfcp_qdio_allocate(qdio)) {
	478	zfcp_qdio_destroy(qdio);
	479	return -ENOMEM;
	480	}
	481
	482	spin_lock_init(&qdio->req_q_lock);
	483	spin_lock_init(&qdio->stat_lock);
	484
	485	adapter->qdio = qdio;
	486	return 0;
	487	}
	488
339f4f4e CS	489	/**
	490	* zfcp_qdio_siosl - Trigger logging in FCP channel
	491	* @adapter: The zfcp_adapter where to trigger logging
	492	*
	493	* Call the cio siosl function to trigger hardware logging. This
	494	* wrapper function sets a flag to ensure hardware logging is only
	495	* triggered once before going through qdio shutdown.
	496	*
	497	* The triggers are always run from qdio tasklet context, so no
	498	* additional synchronization is necessary.
	499	*/
	500	void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
	501	{
	502	int rc;
	503
	504	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
	505	return;
	506
	507	rc = ccw_device_siosl(adapter->ccw_device);
	508	if (!rc)
	509	atomic_set_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
	510	&adapter->status);
	511	}