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