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

/*
 * zfcp device driver
 *
 * Setup and helper functions to access QDIO.
 *
 * Copyright IBM Corporation 2002, 2008
 */

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

#include "zfcp_ext.h"

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

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

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

static struct qdio_buffer_element *
zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
{
	return &q->sbal[sbal_idx]->element[sbale_idx];
}

/**
 * zfcp_qdio_free - free memory used by request- and resposne queue
 * @adapter: pointer to the zfcp_adapter structure
 */
void zfcp_qdio_free(struct zfcp_adapter *adapter)
{
	struct qdio_buffer **sbal_req, **sbal_resp;
	int p;

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

	sbal_req = adapter->req_q.sbal;
	sbal_resp = adapter->resp_q.sbal;

	for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
		free_page((unsigned long) sbal_req[p]);
		free_page((unsigned long) sbal_resp[p]);
	}
}

static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, char *id)
{
	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");

	zfcp_erp_adapter_reopen(adapter,
				ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
				ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
}

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

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

/* this needs to be called prior to updating the queue fill level */
static void zfcp_qdio_account(struct zfcp_adapter *adapter)
{
	ktime_t now;
	s64 span;
	int free, used;

	spin_lock(&adapter->qdio_stat_lock);
	now = ktime_get();
	span = ktime_us_delta(now, adapter->req_q_time);
	free = max(0, atomic_read(&adapter->req_q.count));
	used = QDIO_MAX_BUFFERS_PER_Q - free;
	adapter->req_q_util += used * span;
	adapter->req_q_time = now;
	spin_unlock(&adapter->qdio_stat_lock);
}

static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
			      int queue_no, int first, int count,
			      unsigned long parm)
{
	struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
	struct zfcp_qdio_queue *queue = &adapter->req_q;

	if (unlikely(qdio_err)) {
		zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
		zfcp_qdio_handler_error(adapter, "qdireq1");
		return;
	}

	/* cleanup all SBALs being program-owned now */
	zfcp_qdio_zero_sbals(queue->sbal, first, count);

	zfcp_qdio_account(adapter);
	atomic_add(count, &queue->count);
	wake_up(&adapter->request_wq);
}

static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
				  unsigned long req_id, int sbal_idx)
{
	struct zfcp_fsf_req *fsf_req;
	unsigned long flags;

	spin_lock_irqsave(&adapter->req_list_lock, flags);
	fsf_req = zfcp_reqlist_find(adapter, req_id);

	if (!fsf_req)
		/*
		 * Unknown request means that we have potentially memory
		 * corruption and must stop the machine immediatly.
		 */
		panic("error: unknown request id (%lx) on adapter %s.\n",
		      req_id, dev_name(&adapter->ccw_device->dev));

	zfcp_reqlist_remove(adapter, fsf_req);
	spin_unlock_irqrestore(&adapter->req_list_lock, flags);

	fsf_req->sbal_response = sbal_idx;
	fsf_req->qdio_inb_usage = atomic_read(&adapter->resp_q.count);
	zfcp_fsf_req_complete(fsf_req);
}

static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed)
{
	struct zfcp_qdio_queue *queue = &adapter->resp_q;
	struct ccw_device *cdev = adapter->ccw_device;
	u8 count, start = queue->first;
	unsigned int retval;

	count = atomic_read(&queue->count) + processed;

	retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count);

	if (unlikely(retval)) {
		atomic_set(&queue->count, count);
		/* FIXME: Recover this with an adapter reopen? */
	} else {
		queue->first += count;
		queue->first %= QDIO_MAX_BUFFERS_PER_Q;
		atomic_set(&queue->count, 0);
	}
}

static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
			       int queue_no, int first, int count,
			       unsigned long parm)
{
	struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
	struct zfcp_qdio_queue *queue = &adapter->resp_q;
	struct qdio_buffer_element *sbale;
	int sbal_idx, sbale_idx, sbal_no;

	if (unlikely(qdio_err)) {
		zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
		zfcp_qdio_handler_error(adapter, "qdires1");
		return;
	}

	/*
	 * go through all SBALs from input queue currently
	 * returned by QDIO layer
	 */
	for (sbal_no = 0; sbal_no < count; sbal_no++) {
		sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;

		/* go through all SBALEs of SBAL */
		for (sbale_idx = 0; sbale_idx < QDIO_MAX_ELEMENTS_PER_BUFFER;
		     sbale_idx++) {
			sbale = zfcp_qdio_sbale(queue, sbal_idx, sbale_idx);
			zfcp_qdio_reqid_check(adapter,
					      (unsigned long) sbale->addr,
					      sbal_idx);
			if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
				break;
		};

		if (unlikely(!(sbale->flags & SBAL_FLAGS_LAST_ENTRY)))
			dev_warn(&adapter->ccw_device->dev,
				 "A QDIO protocol error occurred, "
				 "operations continue\n");
	}

	/*
	 * put range of SBALs back to response queue
	 * (including SBALs which have already been free before)
	 */
	zfcp_qdio_resp_put_back(adapter, count);
}

/**
 * zfcp_qdio_sbale_req - return ptr to SBALE of req_q for a struct zfcp_fsf_req
 * @fsf_req: pointer to struct fsf_req
 * Returns: pointer to qdio_buffer_element (SBALE) structure
 */
struct qdio_buffer_element *zfcp_qdio_sbale_req(struct zfcp_fsf_req *req)
{
	return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0);
}

/**
 * zfcp_qdio_sbale_curr - return curr SBALE on req_q for a struct zfcp_fsf_req
 * @fsf_req: pointer to struct fsf_req
 * Returns: pointer to qdio_buffer_element (SBALE) structure
 */
struct qdio_buffer_element *zfcp_qdio_sbale_curr(struct zfcp_fsf_req *req)
{
	return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last,
			       req->sbale_curr);
}

static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
{
	int count = atomic_read(&fsf_req->adapter->req_q.count);
	count = min(count, max_sbals);
	fsf_req->sbal_limit = (fsf_req->sbal_first + count - 1)
					% QDIO_MAX_BUFFERS_PER_Q;
}

static struct qdio_buffer_element *
zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
{
	struct qdio_buffer_element *sbale;

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

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

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

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

	/* keep this requests number of SBALs up-to-date */
	fsf_req->sbal_number++;

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

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

	return sbale;
}

static struct qdio_buffer_element *
zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
{
	if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL)
		return zfcp_qdio_sbal_chain(fsf_req, sbtype);
	fsf_req->sbale_curr++;
	return zfcp_qdio_sbale_curr(fsf_req);
}

static void zfcp_qdio_undo_sbals(struct zfcp_fsf_req *fsf_req)
{
	struct qdio_buffer **sbal = fsf_req->adapter->req_q.sbal;
	int first = fsf_req->sbal_first;
	int last = fsf_req->sbal_last;
	int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) %
		QDIO_MAX_BUFFERS_PER_Q + 1;
	zfcp_qdio_zero_sbals(sbal, first, count);
}

static int zfcp_qdio_fill_sbals(struct zfcp_fsf_req *fsf_req,
				unsigned int sbtype, void *start_addr,
				unsigned int total_length)
{
	struct qdio_buffer_element *sbale;
	unsigned long remaining, length;
	void *addr;

	/* split segment up */
	for (addr = start_addr, remaining = total_length; remaining > 0;
	     addr += length, remaining -= length) {
		sbale = zfcp_qdio_sbale_next(fsf_req, sbtype);
		if (!sbale) {
			atomic_inc(&fsf_req->adapter->qdio_outb_full);
			zfcp_qdio_undo_sbals(fsf_req);
			return -EINVAL;
		}

		/* new piece must not exceed next page boundary */
		length = min(remaining,
			     (PAGE_SIZE - ((unsigned long)addr &
					   (PAGE_SIZE - 1))));
		sbale->addr = addr;
		sbale->length = length;
	}
	return 0;
}

/**
 * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
 * @fsf_req: request to be processed
 * @sbtype: SBALE flags
 * @sg: scatter-gather list
 * @max_sbals: upper bound for number of SBALs to be used
 * Returns: number of bytes, or error (negativ)
 */
int zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
			    struct scatterlist *sg, int max_sbals)
{
	struct qdio_buffer_element *sbale;
	int retval, bytes = 0;

	/* figure out last allowed SBAL */
	zfcp_qdio_sbal_limit(fsf_req, max_sbals);

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

	for (; sg; sg = sg_next(sg)) {
		retval = zfcp_qdio_fill_sbals(fsf_req, sbtype, sg_virt(sg),
					      sg->length);
		if (retval < 0)
			return retval;
		bytes += sg->length;
	}

	/* assume that no other SBALEs are to follow in the same SBAL */
	sbale = zfcp_qdio_sbale_curr(fsf_req);
	sbale->flags |= SBAL_FLAGS_LAST_ENTRY;

	return bytes;
}

/**
 * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
 * @fsf_req: pointer to struct zfcp_fsf_req
 * Returns: 0 on success, error otherwise
 */
int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
{
	struct zfcp_adapter *adapter = fsf_req->adapter;
	struct zfcp_qdio_queue *req_q = &adapter->req_q;
	int first = fsf_req->sbal_first;
	int count = fsf_req->sbal_number;
	int retval;
	unsigned int qdio_flags = QDIO_FLAG_SYNC_OUTPUT;

	zfcp_qdio_account(adapter);

	retval = do_QDIO(adapter->ccw_device, qdio_flags, 0, first, count);
	if (unlikely(retval)) {
		zfcp_qdio_zero_sbals(req_q->sbal, first, count);
		return retval;
	}

	/* account for transferred buffers */
	atomic_sub(count, &req_q->count);
	req_q->first += count;
	req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
	return 0;
}

/**
 * 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
 */
int zfcp_qdio_allocate(struct zfcp_adapter *adapter)
{
	struct qdio_initialize *init_data;

	if (zfcp_qdio_buffers_enqueue(adapter->req_q.sbal) ||
		   zfcp_qdio_buffers_enqueue(adapter->resp_q.sbal))
		return -ENOMEM;

	init_data = &adapter->qdio_init_data;

	init_data->cdev = adapter->ccw_device;
	init_data->q_format = QDIO_ZFCP_QFMT;
	memcpy(init_data->adapter_name, dev_name(&adapter->ccw_device->dev), 8);
	ASCEBC(init_data->adapter_name, 8);
	init_data->qib_param_field_format = 0;
	init_data->qib_param_field = NULL;
	init_data->input_slib_elements = NULL;
	init_data->output_slib_elements = NULL;
	init_data->no_input_qs = 1;
	init_data->no_output_qs = 1;
	init_data->input_handler = zfcp_qdio_int_resp;
	init_data->output_handler = zfcp_qdio_int_req;
	init_data->int_parm = (unsigned long) adapter;
	init_data->flags = QDIO_INBOUND_0COPY_SBALS |
			QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS;
	init_data->input_sbal_addr_array =
			(void **) (adapter->resp_q.sbal);
	init_data->output_sbal_addr_array =
			(void **) (adapter->req_q.sbal);

	return qdio_allocate(init_data);
}

/**
 * zfcp_close_qdio - close qdio queues for an adapter
 */
void zfcp_qdio_close(struct zfcp_adapter *adapter)
{
	struct zfcp_qdio_queue *req_q;
	int first, count;

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

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

	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);

	/* cleanup used outbound sbals */
	count = atomic_read(&req_q->count);
	if (count < QDIO_MAX_BUFFERS_PER_Q) {
		first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q;
		count = QDIO_MAX_BUFFERS_PER_Q - count;
		zfcp_qdio_zero_sbals(req_q->sbal, first, count);
	}
	req_q->first = 0;
	atomic_set(&req_q->count, 0);
	adapter->resp_q.first = 0;
	atomic_set(&adapter->resp_q.count, 0);
}

/**
 * zfcp_qdio_open - prepare and initialize response queue
 * @adapter: pointer to struct zfcp_adapter
 * Returns: 0 on success, otherwise -EIO
 */
int zfcp_qdio_open(struct zfcp_adapter *adapter)
{
	struct qdio_buffer_element *sbale;
	int cc;

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

	if (qdio_establish(&adapter->qdio_init_data))
		goto failed_establish;

	if (qdio_activate(adapter->ccw_device))
		goto failed_qdio;

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

	if (do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_INPUT, 0, 0,
		     QDIO_MAX_BUFFERS_PER_Q))
		goto failed_qdio;

	/* set index of first avalable SBALS / number of available SBALS */
	adapter->req_q.first = 0;
	atomic_set(&adapter->req_q.count, QDIO_MAX_BUFFERS_PER_Q);

	return 0;

failed_qdio:
	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
failed_establish:
	dev_err(&adapter->ccw_device->dev,
		"Setting up the QDIO connection to the FCP adapter failed\n");
	return -EIO;
}
Commit	Line	Data
1da177e4	1	/*
00bab910	2	* zfcp device driver
1da177e4	3	*
00bab910	4	* Setup and helper functions to access QDIO.
1da177e4	5	*
00bab910	6	* Copyright IBM Corporation 2002, 2008
1da177e4 LT	7	*/
1da177e4 LT	8
ecf39d42 CS	9	#define KMSG_COMPONENT "zfcp"
	10	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	11
1da177e4 LT	12	#include "zfcp_ext.h"
1da177e4 LT	13
5d4e2262	14	#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
1da177e4	15
00bab910	16	static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
1da177e4	17	{
b4e44590	18	int pos;
1da177e4	19
b4e44590	20	for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
00bab910 SS	21	sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
00bab910 SS	22	if (!sbal[pos])
b4e44590	23	return -ENOMEM;
b4e44590 SS	24	}
	25	for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
	26	if (pos % QBUFF_PER_PAGE)
00bab910	27	sbal[pos] = sbal[pos - 1] + 1;
b4e44590	28	return 0;
1da177e4 LT	29	}
1da177e4 LT	30
44cc76f2	31	static struct qdio_buffer_element *
00bab910	32	zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
1da177e4	33	{
00bab910	34	return &q->sbal[sbal_idx]->element[sbale_idx];
1da177e4 LT	35	}
1da177e4 LT	36
00bab910 SS	37	/**
	38	* zfcp_qdio_free - free memory used by request- and resposne queue
	39	* @adapter: pointer to the zfcp_adapter structure
	40	*/
	41	void zfcp_qdio_free(struct zfcp_adapter *adapter)
1da177e4	42	{
00bab910 SS	43	struct qdio_buffer sbal_req, sbal_resp;
00bab910 SS	44	int p;
1da177e4	45
00bab910 SS	46	if (adapter->ccw_device)
00bab910 SS	47	qdio_free(adapter->ccw_device);
1da177e4	48
00bab910 SS	49	sbal_req = adapter->req_q.sbal;
00bab910 SS	50	sbal_resp = adapter->resp_q.sbal;
1da177e4	51
00bab910 SS	52	for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
	53	free_page((unsigned long) sbal_req[p]);
	54	free_page((unsigned long) sbal_resp[p]);
	55	}
1da177e4 LT	56	}
1da177e4 LT	57
5ffd51a5	58	static void zfcp_qdio_handler_error(struct zfcp_adapter adapter, char id)
1da177e4	59	{
ff3b24fa	60	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
1da177e4	61
00bab910 SS	62	zfcp_erp_adapter_reopen(adapter,
	63	ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED \|
	64	ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
1da177e4 LT	65	}
1da177e4 LT	66
5d4e2262 CS	67	static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
	68	{
	69	int i, sbal_idx;
	70
	71	for (i = first; i < first + cnt; i++) {
	72	sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
	73	memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
	74	}
	75	}
	76
94506fd1 MP	77	/* this needs to be called prior to updating the queue fill level */
	78	static void zfcp_qdio_account(struct zfcp_adapter *adapter)
	79	{
	80	ktime_t now;
	81	s64 span;
	82	int free, used;
	83
	84	spin_lock(&adapter->qdio_stat_lock);
	85	now = ktime_get();
	86	span = ktime_us_delta(now, adapter->req_q_time);
	87	free = max(0, atomic_read(&adapter->req_q.count));
	88	used = QDIO_MAX_BUFFERS_PER_Q - free;
	89	adapter->req_q_util += used * span;
	90	adapter->req_q_time = now;
	91	spin_unlock(&adapter->qdio_stat_lock);
	92	}
	93
779e6e1c JG	94	static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
779e6e1c JG	95	int queue_no, int first, int count,
00bab910	96	unsigned long parm)
1da177e4	97	{
00bab910 SS	98	struct zfcp_adapter adapter = (struct zfcp_adapter ) parm;
00bab910 SS	99	struct zfcp_qdio_queue *queue = &adapter->req_q;
1da177e4	100
779e6e1c JG	101	if (unlikely(qdio_err)) {
779e6e1c JG	102	zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
5ffd51a5	103	zfcp_qdio_handler_error(adapter, "qdireq1");
00bab910 SS	104	return;
00bab910 SS	105	}
1da177e4 LT	106
1da177e4 LT	107	/* cleanup all SBALs being program-owned now */
00bab910	108	zfcp_qdio_zero_sbals(queue->sbal, first, count);
1da177e4	109
94506fd1	110	zfcp_qdio_account(adapter);
00bab910	111	atomic_add(count, &queue->count);
1da177e4	112	wake_up(&adapter->request_wq);
1da177e4 LT	113	}
1da177e4 LT	114
b03670e5	115	static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
00bab910	116	unsigned long req_id, int sbal_idx)
fea9d6c7 VS	117	{
	118	struct zfcp_fsf_req *fsf_req;
	119	unsigned long flags;
	120
fea9d6c7	121	spin_lock_irqsave(&adapter->req_list_lock, flags);
ca2d02c2	122	fsf_req = zfcp_reqlist_find(adapter, req_id);
fea9d6c7	123
ca2d02c2 HC	124	if (!fsf_req)
	125	/*
	126	* Unknown request means that we have potentially memory
	127	* corruption and must stop the machine immediatly.
	128	*/
00bab910	129	panic("error: unknown request id (%lx) on adapter %s.\n",
b225cf9b	130	req_id, dev_name(&adapter->ccw_device->dev));
fea9d6c7	131
ca2d02c2	132	zfcp_reqlist_remove(adapter, fsf_req);
fea9d6c7 VS	133	spin_unlock_irqrestore(&adapter->req_list_lock, flags);
fea9d6c7 VS	134
00bab910	135	fsf_req->sbal_response = sbal_idx;
0997f1c5	136	fsf_req->qdio_inb_usage = atomic_read(&adapter->resp_q.count);
fea9d6c7	137	zfcp_fsf_req_complete(fsf_req);
fea9d6c7 VS	138	}
fea9d6c7 VS	139
00bab910	140	static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed)
1da177e4	141	{
00bab910 SS	142	struct zfcp_qdio_queue *queue = &adapter->resp_q;
	143	struct ccw_device *cdev = adapter->ccw_device;
	144	u8 count, start = queue->first;
	145	unsigned int retval;
1da177e4	146
00bab910 SS	147	count = atomic_read(&queue->count) + processed;
00bab910 SS	148
779e6e1c	149	retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count);
00bab910 SS	150
	151	if (unlikely(retval)) {
	152	atomic_set(&queue->count, count);
	153	/* FIXME: Recover this with an adapter reopen? */
	154	} else {
	155	queue->first += count;
	156	queue->first %= QDIO_MAX_BUFFERS_PER_Q;
	157	atomic_set(&queue->count, 0);
	158	}
	159	}
	160
779e6e1c JG	161	static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
779e6e1c JG	162	int queue_no, int first, int count,
00bab910 SS	163	unsigned long parm)
	164	{
	165	struct zfcp_adapter adapter = (struct zfcp_adapter ) parm;
	166	struct zfcp_qdio_queue *queue = &adapter->resp_q;
44cc76f2	167	struct qdio_buffer_element *sbale;
00bab910 SS	168	int sbal_idx, sbale_idx, sbal_no;
00bab910 SS	169
779e6e1c JG	170	if (unlikely(qdio_err)) {
779e6e1c JG	171	zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
5ffd51a5	172	zfcp_qdio_handler_error(adapter, "qdires1");
00bab910 SS	173	return;
00bab910 SS	174	}
1da177e4	175
1da177e4 LT	176	/*
	177	* go through all SBALs from input queue currently
	178	* returned by QDIO layer
	179	*/
00bab910 SS	180	for (sbal_no = 0; sbal_no < count; sbal_no++) {
00bab910 SS	181	sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	182
1da177e4 LT	183	/* go through all SBALEs of SBAL */
00bab910 SS	184	for (sbale_idx = 0; sbale_idx < QDIO_MAX_ELEMENTS_PER_BUFFER;
	185	sbale_idx++) {
	186	sbale = zfcp_qdio_sbale(queue, sbal_idx, sbale_idx);
b03670e5	187	zfcp_qdio_reqid_check(adapter,
00bab910 SS	188	(unsigned long) sbale->addr,
	189	sbal_idx);
	190	if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
1da177e4 LT	191	break;
	192	};
	193
00bab910 SS	194	if (unlikely(!(sbale->flags & SBAL_FLAGS_LAST_ENTRY)))
00bab910 SS	195	dev_warn(&adapter->ccw_device->dev,
ff3b24fa CS	196	"A QDIO protocol error occurred, "
ff3b24fa CS	197	"operations continue\n");
1da177e4 LT	198	}
	199
	200	/*
	201	* put range of SBALs back to response queue
	202	* (including SBALs which have already been free before)
	203	*/
00bab910	204	zfcp_qdio_resp_put_back(adapter, count);
1da177e4 LT	205	}
1da177e4 LT	206
1da177e4	207	/**
00bab910 SS	208	* zfcp_qdio_sbale_req - return ptr to SBALE of req_q for a struct zfcp_fsf_req
	209	* @fsf_req: pointer to struct fsf_req
	210	* Returns: pointer to qdio_buffer_element (SBALE) structure
1da177e4	211	*/
44cc76f2	212	struct qdio_buffer_element zfcp_qdio_sbale_req(struct zfcp_fsf_req req)
1da177e4	213	{
00bab910	214	return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0);
1da177e4 LT	215	}
	216
	217	/**
00bab910 SS	218	* zfcp_qdio_sbale_curr - return curr SBALE on req_q for a struct zfcp_fsf_req
	219	* @fsf_req: pointer to struct fsf_req
	220	* Returns: pointer to qdio_buffer_element (SBALE) structure
1da177e4	221	*/
44cc76f2	222	struct qdio_buffer_element zfcp_qdio_sbale_curr(struct zfcp_fsf_req req)
1da177e4	223	{
00bab910 SS	224	return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last,
00bab910 SS	225	req->sbale_curr);
1da177e4 LT	226	}
1da177e4 LT	227
00bab910	228	static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
1da177e4	229	{
00bab910	230	int count = atomic_read(&fsf_req->adapter->req_q.count);
1da177e4	231	count = min(count, max_sbals);
00bab910 SS	232	fsf_req->sbal_limit = (fsf_req->sbal_first + count - 1)
00bab910 SS	233	% QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	234	}
1da177e4 LT	235
44cc76f2	236	static struct qdio_buffer_element *
1da177e4 LT	237	zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
1da177e4 LT	238	{
44cc76f2	239	struct qdio_buffer_element *sbale;
1da177e4 LT	240
	241	/* set last entry flag in current SBALE of current SBAL */
	242	sbale = zfcp_qdio_sbale_curr(fsf_req);
	243	sbale->flags \|= SBAL_FLAGS_LAST_ENTRY;
	244
	245	/* don't exceed last allowed SBAL */
e891bffe	246	if (fsf_req->sbal_last == fsf_req->sbal_limit)
1da177e4 LT	247	return NULL;
	248
	249	/* set chaining flag in first SBALE of current SBAL */
00bab910	250	sbale = zfcp_qdio_sbale_req(fsf_req);
1da177e4 LT	251	sbale->flags \|= SBAL_FLAGS0_MORE_SBALS;
	252
	253	/* calculate index of next SBAL */
e891bffe MP	254	fsf_req->sbal_last++;
e891bffe MP	255	fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	256
	257	/* keep this requests number of SBALs up-to-date */
	258	fsf_req->sbal_number++;
	259
	260	/* start at first SBALE of new SBAL */
	261	fsf_req->sbale_curr = 0;
	262
	263	/* set storage-block type for new SBAL */
	264	sbale = zfcp_qdio_sbale_curr(fsf_req);
	265	sbale->flags \|= sbtype;
	266
	267	return sbale;
	268	}
	269
44cc76f2	270	static struct qdio_buffer_element *
1da177e4 LT	271	zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
	272	{
	273	if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL)
	274	return zfcp_qdio_sbal_chain(fsf_req, sbtype);
1da177e4	275	fsf_req->sbale_curr++;
1da177e4 LT	276	return zfcp_qdio_sbale_curr(fsf_req);
	277	}
	278
00bab910	279	static void zfcp_qdio_undo_sbals(struct zfcp_fsf_req *fsf_req)
1da177e4	280	{
00bab910 SS	281	struct qdio_buffer **sbal = fsf_req->adapter->req_q.sbal;
	282	int first = fsf_req->sbal_first;
	283	int last = fsf_req->sbal_last;
	284	int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) %
	285	QDIO_MAX_BUFFERS_PER_Q + 1;
	286	zfcp_qdio_zero_sbals(sbal, first, count);
1da177e4 LT	287	}
1da177e4 LT	288
00bab910 SS	289	static int zfcp_qdio_fill_sbals(struct zfcp_fsf_req *fsf_req,
	290	unsigned int sbtype, void *start_addr,
	291	unsigned int total_length)
1da177e4	292	{
44cc76f2	293	struct qdio_buffer_element *sbale;
1da177e4 LT	294	unsigned long remaining, length;
	295	void *addr;
	296
00bab910	297	/* split segment up */
1da177e4 LT	298	for (addr = start_addr, remaining = total_length; remaining > 0;
1da177e4 LT	299	addr += length, remaining -= length) {
00bab910 SS	300	sbale = zfcp_qdio_sbale_next(fsf_req, sbtype);
00bab910 SS	301	if (!sbale) {
2450d3e7	302	atomic_inc(&fsf_req->adapter->qdio_outb_full);
00bab910	303	zfcp_qdio_undo_sbals(fsf_req);
1da177e4 LT	304	return -EINVAL;
1da177e4 LT	305	}
00bab910 SS	306
00bab910 SS	307	/* new piece must not exceed next page boundary */
1da177e4	308	length = min(remaining,
00bab910	309	(PAGE_SIZE - ((unsigned long)addr &
1da177e4	310	(PAGE_SIZE - 1))));
00bab910 SS	311	sbale->addr = addr;
00bab910 SS	312	sbale->length = length;
1da177e4	313	}
00bab910	314	return 0;
1da177e4 LT	315	}
1da177e4 LT	316
1da177e4 LT	317	/**
	318	* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
	319	* @fsf_req: request to be processed
	320	* @sbtype: SBALE flags
	321	* @sg: scatter-gather list
1da177e4	322	* @max_sbals: upper bound for number of SBALs to be used
00bab910	323	* Returns: number of bytes, or error (negativ)
1da177e4	324	*/
00bab910 SS	325	int zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
00bab910 SS	326	struct scatterlist *sg, int max_sbals)
1da177e4	327	{
44cc76f2	328	struct qdio_buffer_element *sbale;
00bab910	329	int retval, bytes = 0;
1da177e4 LT	330
	331	/* figure out last allowed SBAL */
	332	zfcp_qdio_sbal_limit(fsf_req, max_sbals);
	333
00bab910 SS	334	/* set storage-block type for this request */
00bab910 SS	335	sbale = zfcp_qdio_sbale_req(fsf_req);
1da177e4 LT	336	sbale->flags \|= sbtype;
1da177e4 LT	337
00bab910 SS	338	for (; sg; sg = sg_next(sg)) {
	339	retval = zfcp_qdio_fill_sbals(fsf_req, sbtype, sg_virt(sg),
	340	sg->length);
	341	if (retval < 0)
	342	return retval;
	343	bytes += sg->length;
1da177e4	344	}
00bab910	345
1da177e4 LT	346	/* assume that no other SBALEs are to follow in the same SBAL */
	347	sbale = zfcp_qdio_sbale_curr(fsf_req);
	348	sbale->flags \|= SBAL_FLAGS_LAST_ENTRY;
00bab910	349
1da177e4 LT	350	return bytes;
	351	}
	352
1da177e4	353	/**
00bab910 SS	354	* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
	355	* @fsf_req: pointer to struct zfcp_fsf_req
	356	* Returns: 0 on success, error otherwise
1da177e4	357	*/
00bab910	358	int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
1da177e4	359	{
00bab910 SS	360	struct zfcp_adapter *adapter = fsf_req->adapter;
	361	struct zfcp_qdio_queue *req_q = &adapter->req_q;
	362	int first = fsf_req->sbal_first;
	363	int count = fsf_req->sbal_number;
21ddaa53 CS	364	int retval;
21ddaa53 CS	365	unsigned int qdio_flags = QDIO_FLAG_SYNC_OUTPUT;
00bab910	366
94506fd1 MP	367	zfcp_qdio_account(adapter);
94506fd1 MP	368
21ddaa53	369	retval = do_QDIO(adapter->ccw_device, qdio_flags, 0, first, count);
00bab910 SS	370	if (unlikely(retval)) {
	371	zfcp_qdio_zero_sbals(req_q->sbal, first, count);
	372	return retval;
	373	}
	374
	375	/* account for transferred buffers */
	376	atomic_sub(count, &req_q->count);
	377	req_q->first += count;
	378	req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
00bab910	379	return 0;
1da177e4 LT	380	}
1da177e4 LT	381
00bab910 SS	382	/**
	383	* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
	384	* @adapter: pointer to struct zfcp_adapter
	385	* Returns: -ENOMEM on memory allocation error or return value from
	386	* qdio_allocate
	387	*/
	388	int zfcp_qdio_allocate(struct zfcp_adapter *adapter)
	389	{
	390	struct qdio_initialize *init_data;
	391
	392	if (zfcp_qdio_buffers_enqueue(adapter->req_q.sbal) \|\|
	393	zfcp_qdio_buffers_enqueue(adapter->resp_q.sbal))
	394	return -ENOMEM;
	395
	396	init_data = &adapter->qdio_init_data;
	397
	398	init_data->cdev = adapter->ccw_device;
	399	init_data->q_format = QDIO_ZFCP_QFMT;
b225cf9b	400	memcpy(init_data->adapter_name, dev_name(&adapter->ccw_device->dev), 8);
00bab910 SS	401	ASCEBC(init_data->adapter_name, 8);
	402	init_data->qib_param_field_format = 0;
	403	init_data->qib_param_field = NULL;
	404	init_data->input_slib_elements = NULL;
	405	init_data->output_slib_elements = NULL;
00bab910 SS	406	init_data->no_input_qs = 1;
	407	init_data->no_output_qs = 1;
	408	init_data->input_handler = zfcp_qdio_int_resp;
	409	init_data->output_handler = zfcp_qdio_int_req;
	410	init_data->int_parm = (unsigned long) adapter;
	411	init_data->flags = QDIO_INBOUND_0COPY_SBALS \|
	412	QDIO_OUTBOUND_0COPY_SBALS \| QDIO_USE_OUTBOUND_PCIS;
	413	init_data->input_sbal_addr_array =
	414	(void **) (adapter->resp_q.sbal);
	415	init_data->output_sbal_addr_array =
	416	(void **) (adapter->req_q.sbal);
	417
	418	return qdio_allocate(init_data);
	419	}
	420
	421	/**
	422	* zfcp_close_qdio - close qdio queues for an adapter
1da177e4	423	*/
00bab910	424	void zfcp_qdio_close(struct zfcp_adapter *adapter)
1da177e4	425	{
00bab910 SS	426	struct zfcp_qdio_queue *req_q;
	427	int first, count;
	428
44cc76f2	429	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
00bab910 SS	430	return;
	431
	432	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
	433	req_q = &adapter->req_q;
0406289e	434	spin_lock_bh(&adapter->req_q_lock);
00bab910	435	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
0406289e	436	spin_unlock_bh(&adapter->req_q_lock);
00bab910	437
779e6e1c	438	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
00bab910 SS	439
	440	/* cleanup used outbound sbals */
	441	count = atomic_read(&req_q->count);
	442	if (count < QDIO_MAX_BUFFERS_PER_Q) {
	443	first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q;
	444	count = QDIO_MAX_BUFFERS_PER_Q - count;
	445	zfcp_qdio_zero_sbals(req_q->sbal, first, count);
1da177e4	446	}
00bab910 SS	447	req_q->first = 0;
00bab910 SS	448	atomic_set(&req_q->count, 0);
00bab910 SS	449	adapter->resp_q.first = 0;
00bab910 SS	450	atomic_set(&adapter->resp_q.count, 0);
1da177e4 LT	451	}
1da177e4 LT	452
00bab910 SS	453	/**
	454	* zfcp_qdio_open - prepare and initialize response queue
	455	* @adapter: pointer to struct zfcp_adapter
	456	* Returns: 0 on success, otherwise -EIO
	457	*/
	458	int zfcp_qdio_open(struct zfcp_adapter *adapter)
	459	{
44cc76f2	460	struct qdio_buffer_element *sbale;
00bab910 SS	461	int cc;
00bab910 SS	462
44cc76f2	463	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
00bab910 SS	464	return -EIO;
00bab910 SS	465
ff3b24fa CS	466	if (qdio_establish(&adapter->qdio_init_data))
ff3b24fa CS	467	goto failed_establish;
00bab910	468
ff3b24fa	469	if (qdio_activate(adapter->ccw_device))
00bab910	470	goto failed_qdio;
00bab910 SS	471
	472	for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
	473	sbale = &(adapter->resp_q.sbal[cc]->element[0]);
	474	sbale->length = 0;
	475	sbale->flags = SBAL_FLAGS_LAST_ENTRY;
	476	sbale->addr = NULL;
	477	}
	478
	479	if (do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_INPUT, 0, 0,
ff3b24fa	480	QDIO_MAX_BUFFERS_PER_Q))
00bab910	481	goto failed_qdio;
00bab910 SS	482
	483	/* set index of first avalable SBALS / number of available SBALS */
	484	adapter->req_q.first = 0;
	485	atomic_set(&adapter->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
00bab910 SS	486
	487	return 0;
	488
	489	failed_qdio:
779e6e1c	490	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
ff3b24fa CS	491	failed_establish:
	492	dev_err(&adapter->ccw_device->dev,
	493	"Setting up the QDIO connection to the FCP adapter failed\n");
00bab910 SS	494	return -EIO;
00bab910 SS	495	}