[mirror_ubuntu-kernels.git] / drivers / s390 / scsi / zfcp_qdio.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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 = true;
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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
00bab910	3	* zfcp device driver
1da177e4	4	*
00bab910	5	* Setup and helper functions to access QDIO.
1da177e4	6	*
a53c8fab	7	* Copyright IBM Corp. 2002, 2010
1da177e4 LT	8	*/
1da177e4 LT	9
ecf39d42 CS	10	#define KMSG_COMPONENT "zfcp"
	11	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	12
5a0e3ad6	13	#include <linux/slab.h>
3a4c5d59	14	#include <linux/module.h>
1da177e4	15	#include "zfcp_ext.h"
34c2b712	16	#include "zfcp_qdio.h"
1da177e4	17
5156934b	18	static bool enable_multibuffer = true;
86a9668a	19	module_param_named(datarouter, enable_multibuffer, bool, 0400);
909ee499	20	MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)");
86a9668a	21
339f4f4e CS	22	static void zfcp_qdio_handler_error(struct zfcp_qdio qdio, char id,
339f4f4e CS	23	unsigned int qdio_err)
1da177e4	24	{
564e1c86 SS	25	struct zfcp_adapter *adapter = qdio->adapter;
564e1c86 SS	26
ff3b24fa	27	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
1da177e4	28
86a9668a	29	if (qdio_err & QDIO_ERROR_SLSB_STATE) {
339f4f4e	30	zfcp_qdio_siosl(adapter);
86a9668a SS	31	zfcp_erp_adapter_shutdown(adapter, 0, id);
	32	return;
	33	}
00bab910 SS	34	zfcp_erp_adapter_reopen(adapter,
00bab910 SS	35	ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED \|
ea4a3a6a	36	ZFCP_STATUS_COMMON_ERP_FAILED, id);
1da177e4 LT	37	}
1da177e4 LT	38
5d4e2262 CS	39	static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
	40	{
	41	int i, sbal_idx;
	42
	43	for (i = first; i < first + cnt; i++) {
	44	sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
	45	memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
	46	}
	47	}
	48
94506fd1	49	/* this needs to be called prior to updating the queue fill level */
41e05a12	50	static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
94506fd1	51	{
41e05a12	52	unsigned long long now, span;
706eca49	53	int used;
94506fd1	54
1aae0560	55	now = get_tod_clock_monotonic();
41e05a12	56	span = (now - qdio->req_q_time) >> 12;
706eca49	57	used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
564e1c86 SS	58	qdio->req_q_util += used * span;
564e1c86 SS	59	qdio->req_q_time = now;
94506fd1 MP	60	}
94506fd1 MP	61
779e6e1c	62	static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
706eca49	63	int queue_no, int idx, int count,
00bab910	64	unsigned long parm)
1da177e4	65	{
564e1c86	66	struct zfcp_qdio qdio = (struct zfcp_qdio ) parm;
1da177e4	67
779e6e1c	68	if (unlikely(qdio_err)) {
339f4f4e	69	zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
00bab910 SS	70	return;
00bab910 SS	71	}
1da177e4 LT	72
1da177e4 LT	73	/* cleanup all SBALs being program-owned now */
706eca49	74	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
1da177e4	75
44a24cb3	76	spin_lock_irq(&qdio->stat_lock);
564e1c86	77	zfcp_qdio_account(qdio);
44a24cb3	78	spin_unlock_irq(&qdio->stat_lock);
706eca49	79	atomic_add(count, &qdio->req_q_free);
564e1c86	80	wake_up(&qdio->req_q_wq);
1da177e4 LT	81	}
1da177e4 LT	82
779e6e1c	83	static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
706eca49	84	int queue_no, int idx, int count,
00bab910 SS	85	unsigned long parm)
00bab910 SS	86	{
564e1c86	87	struct zfcp_qdio qdio = (struct zfcp_qdio ) parm;
86a9668a	88	struct zfcp_adapter *adapter = qdio->adapter;
86a9668a	89	int sbal_no, sbal_idx;
00bab910	90
779e6e1c	91	if (unlikely(qdio_err)) {
86a9668a	92	if (zfcp_adapter_multi_buffer_active(adapter)) {
01e60527 SM	93	void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
	94	struct qdio_buffer_element *sbale;
	95	u64 req_id;
	96	u8 scount;
	97
	98	memset(pl, 0,
	99	ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
86a9668a SS	100	sbale = qdio->res_q[idx]->element;
86a9668a SS	101	req_id = (u64) sbale->addr;
01e60527 SM	102	scount = min(sbale->scount + 1,
	103	ZFCP_QDIO_MAX_SBALS_PER_REQ + 1);
	104	/* incl. signaling SBAL */
86a9668a SS	105
	106	for (sbal_no = 0; sbal_no < scount; sbal_no++) {
	107	sbal_idx = (idx + sbal_no) %
	108	QDIO_MAX_BUFFERS_PER_Q;
	109	pl[sbal_no] = qdio->res_q[sbal_idx];
	110	}
	111	zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
	112	}
339f4f4e	113	zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
00bab910 SS	114	return;
00bab910 SS	115	}
1da177e4	116
1da177e4 LT	117	/*
	118	* go through all SBALs from input queue currently
	119	* returned by QDIO layer
	120	*/
00bab910	121	for (sbal_no = 0; sbal_no < count; sbal_no++) {
706eca49	122	sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
1da177e4	123	/* go through all SBALEs of SBAL */
564e1c86	124	zfcp_fsf_reqid_check(qdio, sbal_idx);
1da177e4 LT	125	}
	126
	127	/*
706eca49	128	* put SBALs back to response queue
1da177e4	129	*/
706eca49	130	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
ea4a3a6a	131	zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2");
1da177e4 LT	132	}
1da177e4 LT	133
44cc76f2	134	static struct qdio_buffer_element *
1674b405	135	zfcp_qdio_sbal_chain(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	136	{
44cc76f2	137	struct qdio_buffer_element *sbale;
1da177e4 LT	138
1da177e4 LT	139	/* set last entry flag in current SBALE of current SBAL */
564e1c86	140	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
3ec90878	141	sbale->eflags \|= SBAL_EFLAGS_LAST_ENTRY;
1da177e4 LT	142
1da177e4 LT	143	/* don't exceed last allowed SBAL */
42428f74	144	if (q_req->sbal_last == q_req->sbal_limit)
1da177e4 LT	145	return NULL;
	146
	147	/* set chaining flag in first SBALE of current SBAL */
564e1c86	148	sbale = zfcp_qdio_sbale_req(qdio, q_req);
3ec90878	149	sbale->sflags \|= SBAL_SFLAGS0_MORE_SBALS;
1da177e4 LT	150
1da177e4 LT	151	/* calculate index of next SBAL */
42428f74 SS	152	q_req->sbal_last++;
42428f74 SS	153	q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	154
1da177e4 LT	155	/* keep this requests number of SBALs up-to-date */
42428f74	156	q_req->sbal_number++;
01b04759	157	BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
1da177e4 LT	158
1da177e4 LT	159	/* start at first SBALE of new SBAL */
42428f74	160	q_req->sbale_curr = 0;
1da177e4 LT	161
1da177e4 LT	162	/* set storage-block type for new SBAL */
564e1c86	163	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
3ec90878	164	sbale->sflags \|= q_req->sbtype;
1da177e4 LT	165
	166	return sbale;
	167	}
	168
44cc76f2	169	static struct qdio_buffer_element *
1674b405	170	zfcp_qdio_sbale_next(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	171	{
86a9668a	172	if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
1674b405	173	return zfcp_qdio_sbal_chain(qdio, q_req);
42428f74	174	q_req->sbale_curr++;
564e1c86	175	return zfcp_qdio_sbale_curr(qdio, q_req);
1da177e4 LT	176	}
1da177e4 LT	177
1da177e4 LT	178	/**
1da177e4 LT	179	* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
1674b405 CS	180	* @qdio: pointer to struct zfcp_qdio
1674b405 CS	181	* @q_req: pointer to struct zfcp_qdio_req
1da177e4	182	* @sg: scatter-gather list
1da177e4	183	* @max_sbals: upper bound for number of SBALs to be used
86a9668a	184	* Returns: zero or -EINVAL on error
1da177e4	185	*/
34c2b712	186	int zfcp_qdio_sbals_from_sg(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req,
01b04759	187	struct scatterlist *sg)
1da177e4	188	{
44cc76f2	189	struct qdio_buffer_element *sbale;
1da177e4	190
00bab910	191	/* set storage-block type for this request */
564e1c86	192	sbale = zfcp_qdio_sbale_req(qdio, q_req);
3ec90878	193	sbale->sflags \|= q_req->sbtype;
1da177e4	194
00bab910	195	for (; sg; sg = sg_next(sg)) {
1674b405	196	sbale = zfcp_qdio_sbale_next(qdio, q_req);
68322984 CS	197	if (!sbale) {
68322984 CS	198	atomic_inc(&qdio->req_q_full);
706eca49 SS	199	zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
706eca49 SS	200	q_req->sbal_number);
68322984 CS	201	return -EINVAL;
68322984 CS	202	}
68322984 CS	203	sbale->addr = sg_virt(sg);
68322984 CS	204	sbale->length = sg->length;
1da177e4	205	}
86a9668a	206	return 0;
1da177e4 LT	207	}
1da177e4 LT	208
6b9e1520 CS	209	static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
6b9e1520 CS	210	{
706eca49	211	if (atomic_read(&qdio->req_q_free) \|\|
c2af7545	212	!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
6b9e1520	213	return 1;
6b9e1520 CS	214	return 0;
	215	}
	216
	217	/**
	218	* zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
	219	* @qdio: pointer to struct zfcp_qdio
	220	*
	221	* The req_q_lock must be held by the caller of this function, and
	222	* this function may only be called from process context; it will
	223	* sleep when waiting for a free sbal.
	224	*
	225	* Returns: 0 on success, -EIO if there is no free sbal after waiting.
	226	*/
	227	int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
	228	{
	229	long ret;
	230
d79ff142 MP	231	ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq,
d79ff142 MP	232	zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ);
c2af7545 CS	233
	234	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
	235	return -EIO;
	236
6b9e1520 CS	237	if (ret > 0)
6b9e1520 CS	238	return 0;
c2af7545	239
6b9e1520 CS	240	if (!ret) {
	241	atomic_inc(&qdio->req_q_full);
	242	/* assume hanging outbound queue, try queue recovery */
ea4a3a6a	243	zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1");
6b9e1520 CS	244	}
6b9e1520 CS	245
6b9e1520 CS	246	return -EIO;
	247	}
	248
1da177e4	249	/**
00bab910	250	* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
564e1c86	251	* @qdio: pointer to struct zfcp_qdio
34c2b712	252	* @q_req: pointer to struct zfcp_qdio_req
00bab910	253	* Returns: 0 on success, error otherwise
1da177e4	254	*/
34c2b712	255	int zfcp_qdio_send(struct zfcp_qdio qdio, struct zfcp_qdio_req q_req)
1da177e4	256	{
21ddaa53	257	int retval;
706eca49	258	u8 sbal_number = q_req->sbal_number;
00bab910	259
44a24cb3	260	spin_lock(&qdio->stat_lock);
564e1c86	261	zfcp_qdio_account(qdio);
44a24cb3	262	spin_unlock(&qdio->stat_lock);
94506fd1	263
706eca49 SS	264	retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
	265	q_req->sbal_first, sbal_number);
	266
00bab910	267	if (unlikely(retval)) {
706eca49 SS	268	zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
706eca49 SS	269	sbal_number);
00bab910 SS	270	return retval;
	271	}
	272
	273	/* account for transferred buffers */
706eca49 SS	274	atomic_sub(sbal_number, &qdio->req_q_free);
	275	qdio->req_q_idx += sbal_number;
	276	qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
	277
00bab910	278	return 0;
1da177e4 LT	279	}
1da177e4 LT	280
564e1c86 SS	281
	282	static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
	283	struct zfcp_qdio *qdio)
	284	{
d36deae7	285	memset(id, 0, sizeof(*id));
564e1c86 SS	286	id->cdev = qdio->adapter->ccw_device;
	287	id->q_format = QDIO_ZFCP_QFMT;
	288	memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
	289	ASCEBC(id->adapter_name, 8);
dcc18f48	290	id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
86a9668a SS	291	if (enable_multibuffer)
86a9668a SS	292	id->qdr_ac \|= QDR_AC_MULTI_BUFFER_ENABLE;
564e1c86 SS	293	id->no_input_qs = 1;
	294	id->no_output_qs = 1;
	295	id->input_handler = zfcp_qdio_int_resp;
	296	id->output_handler = zfcp_qdio_int_req;
	297	id->int_parm = (unsigned long) qdio;
706eca49 SS	298	id->input_sbal_addr_array = (void **) (qdio->res_q);
706eca49 SS	299	id->output_sbal_addr_array = (void **) (qdio->req_q);
3d6c76ff JG	300	id->scan_threshold =
3d6c76ff JG	301	QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
564e1c86	302	}
dcc18f48	303
00bab910 SS	304	/**
	305	* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
	306	* @adapter: pointer to struct zfcp_adapter
	307	* Returns: -ENOMEM on memory allocation error or return value from
	308	* qdio_allocate
	309	*/
d5a282a1	310	static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
00bab910	311	{
564e1c86	312	struct qdio_initialize init_data;
852eb1aa	313	int ret;
00bab910	314
852eb1aa SO	315	ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
852eb1aa SO	316	if (ret)
00bab910 SS	317	return -ENOMEM;
00bab910 SS	318
852eb1aa SO	319	ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
	320	if (ret)
	321	goto free_req_q;
	322
564e1c86	323	zfcp_qdio_setup_init_data(&init_data, qdio);
3d63d3b4	324	init_waitqueue_head(&qdio->req_q_wq);
564e1c86	325
852eb1aa SO	326	ret = qdio_allocate(&init_data);
	327	if (ret)
	328	goto free_res_q;
	329
	330	return 0;
	331
	332	free_res_q:
	333	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
	334	free_req_q:
	335	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
	336	return ret;
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);
805de8f4	353	atomic_andnot(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
805de8f4	388	atomic_andnot(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
339f4f4e CS	389	&qdio->adapter->status);
339f4f4e CS	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)
805de8f4	400	atomic_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
dcc18f48 CS	401	&qdio->adapter->status);
dcc18f48 CS	402
86a9668a	403	if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
805de8f4	404	atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
86a9668a SS	405	qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
86a9668a SS	406	} else {
805de8f4	407	atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
86a9668a SS	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);
805de8f4	431	atomic_or(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	if (!qdio)
	451	return;
	452
	453	if (qdio->adapter->ccw_device)
	454	qdio_free(qdio->adapter->ccw_device);
	455
852eb1aa SO	456	qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q);
852eb1aa SO	457	qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q);
d5a282a1 SS	458	kfree(qdio);
	459	}
	460
	461	int zfcp_qdio_setup(struct zfcp_adapter *adapter)
	462	{
	463	struct zfcp_qdio *qdio;
	464
	465	qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
	466	if (!qdio)
	467	return -ENOMEM;
	468
	469	qdio->adapter = adapter;
	470
	471	if (zfcp_qdio_allocate(qdio)) {
852eb1aa	472	kfree(qdio);
d5a282a1 SS	473	return -ENOMEM;
	474	}
	475
	476	spin_lock_init(&qdio->req_q_lock);
	477	spin_lock_init(&qdio->stat_lock);
	478
	479	adapter->qdio = qdio;
	480	return 0;
	481	}
	482
339f4f4e CS	483	/**
	484	* zfcp_qdio_siosl - Trigger logging in FCP channel
	485	* @adapter: The zfcp_adapter where to trigger logging
	486	*
	487	* Call the cio siosl function to trigger hardware logging. This
	488	* wrapper function sets a flag to ensure hardware logging is only
	489	* triggered once before going through qdio shutdown.
	490	*
	491	* The triggers are always run from qdio tasklet context, so no
	492	* additional synchronization is necessary.
	493	*/
	494	void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
	495	{
	496	int rc;
	497
	498	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
	499	return;
	500
	501	rc = ccw_device_siosl(adapter->ccw_device);
	502	if (!rc)
805de8f4	503	atomic_or(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
339f4f4e CS	504	&adapter->status);
339f4f4e CS	505	}