[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
 */

#include "zfcp_ext.h"

/* FIXME(tune): free space should be one max. SBAL chain plus what? */
#define ZFCP_QDIO_PCI_INTERVAL	(QDIO_MAX_BUFFERS_PER_Q \
				- (FSF_MAX_SBALS_PER_REQ + 4))
#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 volatile 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, u8 id)
{
	dev_warn(&adapter->ccw_device->dev, "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));
	}
}

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, 140);
		return;
	}

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

	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, zfcp_get_busid_by_adapter(adapter));

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

	fsf_req->sbal_response = sbal_idx;
	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;
	volatile 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, 147);
		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,
				 "Protocol violation by adapter. "
				 "Continuing operations.\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
 */
volatile 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
 */
volatile 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 volatile struct qdio_buffer_element *
zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
{
	volatile 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 volatile 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)
{
	volatile 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)
{
	volatile 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, pci, pci_batch;
	volatile struct qdio_buffer_element *sbale;

	/* acknowledgements for transferred buffers */
	pci_batch = req_q->pci_batch + count;
	if (unlikely(pci_batch >= ZFCP_QDIO_PCI_INTERVAL)) {
		pci_batch %= ZFCP_QDIO_PCI_INTERVAL;
		pci = first + count - (pci_batch + 1);
		pci %= QDIO_MAX_BUFFERS_PER_Q;
		sbale = zfcp_qdio_sbale(req_q, pci, 0);
		sbale->flags |= SBAL_FLAGS0_PCI;
	}

	retval = do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 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;
	req_q->pci_batch = pci_batch;
	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, zfcp_get_busid_by_adapter(adapter), 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_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
		return;

	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
	req_q = &adapter->req_q;
	spin_lock_bh(&req_q->lock);
	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
	spin_unlock_bh(&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);
	req_q->pci_batch = 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)
{
	volatile struct qdio_buffer_element *sbale;
	int cc;

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

	if (qdio_establish(&adapter->qdio_init_data)) {
		dev_err(&adapter->ccw_device->dev,
			 "Establish of QDIO queues failed.\n");
		return -EIO;
	}

	if (qdio_activate(adapter->ccw_device)) {
		dev_err(&adapter->ccw_device->dev,
			 "Activate of QDIO queues failed.\n");
		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)) {
		dev_err(&adapter->ccw_device->dev,
			 "Init of QDIO response queue failed.\n");
		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);
	adapter->req_q.pci_batch = 0;

	return 0;

failed_qdio:
	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
	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
1da177e4 LT	9	#include "zfcp_ext.h"
1da177e4 LT	10
00bab910 SS	11	/* FIXME(tune): free space should be one max. SBAL chain plus what? */
00bab910 SS	12	#define ZFCP_QDIO_PCI_INTERVAL (QDIO_MAX_BUFFERS_PER_Q \
c41f8cbd	13	- (FSF_MAX_SBALS_PER_REQ + 4))
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
00bab910 SS	31	static volatile struct qdio_buffer_element *
00bab910 SS	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
00bab910	58	static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, u8 id)
1da177e4	59	{
00bab910	60	dev_warn(&adapter->ccw_device->dev, "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
779e6e1c JG	77	static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
779e6e1c JG	78	int queue_no, int first, int count,
00bab910	79	unsigned long parm)
1da177e4	80	{
00bab910 SS	81	struct zfcp_adapter adapter = (struct zfcp_adapter ) parm;
00bab910 SS	82	struct zfcp_qdio_queue *queue = &adapter->req_q;
1da177e4	83
779e6e1c JG	84	if (unlikely(qdio_err)) {
779e6e1c JG	85	zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
00bab910 SS	86	zfcp_qdio_handler_error(adapter, 140);
	87	return;
	88	}
1da177e4 LT	89
1da177e4 LT	90	/* cleanup all SBALs being program-owned now */
00bab910	91	zfcp_qdio_zero_sbals(queue->sbal, first, count);
1da177e4	92
00bab910	93	atomic_add(count, &queue->count);
1da177e4	94	wake_up(&adapter->request_wq);
1da177e4 LT	95	}
1da177e4 LT	96
b03670e5	97	static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
00bab910	98	unsigned long req_id, int sbal_idx)
fea9d6c7 VS	99	{
	100	struct zfcp_fsf_req *fsf_req;
	101	unsigned long flags;
	102
fea9d6c7	103	spin_lock_irqsave(&adapter->req_list_lock, flags);
ca2d02c2	104	fsf_req = zfcp_reqlist_find(adapter, req_id);
fea9d6c7	105
ca2d02c2 HC	106	if (!fsf_req)
	107	/*
	108	* Unknown request means that we have potentially memory
	109	* corruption and must stop the machine immediatly.
	110	*/
00bab910	111	panic("error: unknown request id (%lx) on adapter %s.\n",
ca2d02c2	112	req_id, zfcp_get_busid_by_adapter(adapter));
fea9d6c7	113
ca2d02c2	114	zfcp_reqlist_remove(adapter, fsf_req);
fea9d6c7 VS	115	spin_unlock_irqrestore(&adapter->req_list_lock, flags);
fea9d6c7 VS	116
00bab910	117	fsf_req->sbal_response = sbal_idx;
fea9d6c7	118	zfcp_fsf_req_complete(fsf_req);
fea9d6c7 VS	119	}
fea9d6c7 VS	120
00bab910	121	static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed)
1da177e4	122	{
00bab910 SS	123	struct zfcp_qdio_queue *queue = &adapter->resp_q;
	124	struct ccw_device *cdev = adapter->ccw_device;
	125	u8 count, start = queue->first;
	126	unsigned int retval;
1da177e4	127
00bab910 SS	128	count = atomic_read(&queue->count) + processed;
00bab910 SS	129
779e6e1c	130	retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count);
00bab910 SS	131
	132	if (unlikely(retval)) {
	133	atomic_set(&queue->count, count);
	134	/* FIXME: Recover this with an adapter reopen? */
	135	} else {
	136	queue->first += count;
	137	queue->first %= QDIO_MAX_BUFFERS_PER_Q;
	138	atomic_set(&queue->count, 0);
	139	}
	140	}
	141
779e6e1c JG	142	static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
779e6e1c JG	143	int queue_no, int first, int count,
00bab910 SS	144	unsigned long parm)
	145	{
	146	struct zfcp_adapter adapter = (struct zfcp_adapter ) parm;
	147	struct zfcp_qdio_queue *queue = &adapter->resp_q;
	148	volatile struct qdio_buffer_element *sbale;
	149	int sbal_idx, sbale_idx, sbal_no;
	150
779e6e1c JG	151	if (unlikely(qdio_err)) {
779e6e1c JG	152	zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
00bab910 SS	153	zfcp_qdio_handler_error(adapter, 147);
	154	return;
	155	}
1da177e4	156
1da177e4 LT	157	/*
	158	* go through all SBALs from input queue currently
	159	* returned by QDIO layer
	160	*/
00bab910 SS	161	for (sbal_no = 0; sbal_no < count; sbal_no++) {
00bab910 SS	162	sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	163
1da177e4 LT	164	/* go through all SBALEs of SBAL */
00bab910 SS	165	for (sbale_idx = 0; sbale_idx < QDIO_MAX_ELEMENTS_PER_BUFFER;
	166	sbale_idx++) {
	167	sbale = zfcp_qdio_sbale(queue, sbal_idx, sbale_idx);
b03670e5	168	zfcp_qdio_reqid_check(adapter,
00bab910 SS	169	(unsigned long) sbale->addr,
	170	sbal_idx);
	171	if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
1da177e4 LT	172	break;
	173	};
	174
00bab910 SS	175	if (unlikely(!(sbale->flags & SBAL_FLAGS_LAST_ENTRY)))
	176	dev_warn(&adapter->ccw_device->dev,
	177	"Protocol violation by adapter. "
	178	"Continuing operations.\n");
1da177e4 LT	179	}
	180
	181	/*
	182	* put range of SBALs back to response queue
	183	* (including SBALs which have already been free before)
	184	*/
00bab910	185	zfcp_qdio_resp_put_back(adapter, count);
1da177e4 LT	186	}
1da177e4 LT	187
1da177e4	188	/**
00bab910 SS	189	* zfcp_qdio_sbale_req - return ptr to SBALE of req_q for a struct zfcp_fsf_req
	190	* @fsf_req: pointer to struct fsf_req
	191	* Returns: pointer to qdio_buffer_element (SBALE) structure
1da177e4	192	*/
4d284cac	193	volatile struct qdio_buffer_element *
00bab910	194	zfcp_qdio_sbale_req(struct zfcp_fsf_req *req)
1da177e4	195	{
00bab910	196	return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0);
1da177e4 LT	197	}
	198
	199	/**
00bab910 SS	200	* zfcp_qdio_sbale_curr - return curr SBALE on req_q for a struct zfcp_fsf_req
	201	* @fsf_req: pointer to struct fsf_req
	202	* Returns: pointer to qdio_buffer_element (SBALE) structure
1da177e4	203	*/
4d284cac	204	volatile struct qdio_buffer_element *
00bab910	205	zfcp_qdio_sbale_curr(struct zfcp_fsf_req *req)
1da177e4	206	{
00bab910 SS	207	return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last,
00bab910 SS	208	req->sbale_curr);
1da177e4 LT	209	}
1da177e4 LT	210
00bab910	211	static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
1da177e4	212	{
00bab910	213	int count = atomic_read(&fsf_req->adapter->req_q.count);
1da177e4	214	count = min(count, max_sbals);
00bab910 SS	215	fsf_req->sbal_limit = (fsf_req->sbal_first + count - 1)
00bab910 SS	216	% QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	217	}
1da177e4 LT	218
4d284cac	219	static volatile struct qdio_buffer_element *
1da177e4 LT	220	zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
	221	{
	222	volatile struct qdio_buffer_element *sbale;
	223
	224	/* set last entry flag in current SBALE of current SBAL */
	225	sbale = zfcp_qdio_sbale_curr(fsf_req);
	226	sbale->flags \|= SBAL_FLAGS_LAST_ENTRY;
	227
	228	/* don't exceed last allowed SBAL */
e891bffe	229	if (fsf_req->sbal_last == fsf_req->sbal_limit)
1da177e4 LT	230	return NULL;
	231
	232	/* set chaining flag in first SBALE of current SBAL */
00bab910	233	sbale = zfcp_qdio_sbale_req(fsf_req);
1da177e4 LT	234	sbale->flags \|= SBAL_FLAGS0_MORE_SBALS;
	235
	236	/* calculate index of next SBAL */
e891bffe MP	237	fsf_req->sbal_last++;
e891bffe MP	238	fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
1da177e4 LT	239
	240	/* keep this requests number of SBALs up-to-date */
	241	fsf_req->sbal_number++;
	242
	243	/* start at first SBALE of new SBAL */
	244	fsf_req->sbale_curr = 0;
	245
	246	/* set storage-block type for new SBAL */
	247	sbale = zfcp_qdio_sbale_curr(fsf_req);
	248	sbale->flags \|= sbtype;
	249
	250	return sbale;
	251	}
	252
4d284cac	253	static volatile struct qdio_buffer_element *
1da177e4 LT	254	zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
	255	{
	256	if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL)
	257	return zfcp_qdio_sbal_chain(fsf_req, sbtype);
1da177e4	258	fsf_req->sbale_curr++;
1da177e4 LT	259	return zfcp_qdio_sbale_curr(fsf_req);
	260	}
	261
00bab910	262	static void zfcp_qdio_undo_sbals(struct zfcp_fsf_req *fsf_req)
1da177e4	263	{
00bab910 SS	264	struct qdio_buffer **sbal = fsf_req->adapter->req_q.sbal;
	265	int first = fsf_req->sbal_first;
	266	int last = fsf_req->sbal_last;
	267	int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) %
	268	QDIO_MAX_BUFFERS_PER_Q + 1;
	269	zfcp_qdio_zero_sbals(sbal, first, count);
1da177e4 LT	270	}
1da177e4 LT	271
00bab910 SS	272	static int zfcp_qdio_fill_sbals(struct zfcp_fsf_req *fsf_req,
	273	unsigned int sbtype, void *start_addr,
	274	unsigned int total_length)
1da177e4 LT	275	{
1da177e4 LT	276	volatile struct qdio_buffer_element *sbale;
1da177e4 LT	277	unsigned long remaining, length;
	278	void *addr;
	279
00bab910	280	/* split segment up */
1da177e4 LT	281	for (addr = start_addr, remaining = total_length; remaining > 0;
1da177e4 LT	282	addr += length, remaining -= length) {
00bab910 SS	283	sbale = zfcp_qdio_sbale_next(fsf_req, sbtype);
00bab910 SS	284	if (!sbale) {
2450d3e7	285	atomic_inc(&fsf_req->adapter->qdio_outb_full);
00bab910	286	zfcp_qdio_undo_sbals(fsf_req);
1da177e4 LT	287	return -EINVAL;
1da177e4 LT	288	}
00bab910 SS	289
00bab910 SS	290	/* new piece must not exceed next page boundary */
1da177e4	291	length = min(remaining,
00bab910	292	(PAGE_SIZE - ((unsigned long)addr &
1da177e4	293	(PAGE_SIZE - 1))));
00bab910 SS	294	sbale->addr = addr;
00bab910 SS	295	sbale->length = length;
1da177e4	296	}
00bab910	297	return 0;
1da177e4 LT	298	}
1da177e4 LT	299
1da177e4 LT	300	/**
	301	* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
	302	* @fsf_req: request to be processed
	303	* @sbtype: SBALE flags
	304	* @sg: scatter-gather list
1da177e4	305	* @max_sbals: upper bound for number of SBALs to be used
00bab910	306	* Returns: number of bytes, or error (negativ)
1da177e4	307	*/
00bab910 SS	308	int zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
00bab910 SS	309	struct scatterlist *sg, int max_sbals)
1da177e4	310	{
1da177e4	311	volatile struct qdio_buffer_element *sbale;
00bab910	312	int retval, bytes = 0;
1da177e4 LT	313
	314	/* figure out last allowed SBAL */
	315	zfcp_qdio_sbal_limit(fsf_req, max_sbals);
	316
00bab910 SS	317	/* set storage-block type for this request */
00bab910 SS	318	sbale = zfcp_qdio_sbale_req(fsf_req);
1da177e4 LT	319	sbale->flags \|= sbtype;
1da177e4 LT	320
00bab910 SS	321	for (; sg; sg = sg_next(sg)) {
	322	retval = zfcp_qdio_fill_sbals(fsf_req, sbtype, sg_virt(sg),
	323	sg->length);
	324	if (retval < 0)
	325	return retval;
	326	bytes += sg->length;
1da177e4	327	}
00bab910	328
1da177e4 LT	329	/* assume that no other SBALEs are to follow in the same SBAL */
	330	sbale = zfcp_qdio_sbale_curr(fsf_req);
	331	sbale->flags \|= SBAL_FLAGS_LAST_ENTRY;
00bab910	332
1da177e4 LT	333	return bytes;
	334	}
	335
1da177e4	336	/**
00bab910 SS	337	* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
	338	* @fsf_req: pointer to struct zfcp_fsf_req
	339	* Returns: 0 on success, error otherwise
1da177e4	340	*/
00bab910	341	int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
1da177e4	342	{
00bab910 SS	343	struct zfcp_adapter *adapter = fsf_req->adapter;
	344	struct zfcp_qdio_queue *req_q = &adapter->req_q;
	345	int first = fsf_req->sbal_first;
	346	int count = fsf_req->sbal_number;
	347	int retval, pci, pci_batch;
	348	volatile struct qdio_buffer_element *sbale;
	349
	350	/* acknowledgements for transferred buffers */
	351	pci_batch = req_q->pci_batch + count;
	352	if (unlikely(pci_batch >= ZFCP_QDIO_PCI_INTERVAL)) {
	353	pci_batch %= ZFCP_QDIO_PCI_INTERVAL;
	354	pci = first + count - (pci_batch + 1);
	355	pci %= QDIO_MAX_BUFFERS_PER_Q;
	356	sbale = zfcp_qdio_sbale(req_q, pci, 0);
	357	sbale->flags \|= SBAL_FLAGS0_PCI;
	358	}
	359
	360	retval = do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, first,
779e6e1c	361	count);
00bab910 SS	362	if (unlikely(retval)) {
	363	zfcp_qdio_zero_sbals(req_q->sbal, first, count);
	364	return retval;
	365	}
	366
	367	/* account for transferred buffers */
	368	atomic_sub(count, &req_q->count);
	369	req_q->first += count;
	370	req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
	371	req_q->pci_batch = pci_batch;
	372	return 0;
1da177e4 LT	373	}
1da177e4 LT	374
00bab910 SS	375	/**
	376	* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
	377	* @adapter: pointer to struct zfcp_adapter
	378	* Returns: -ENOMEM on memory allocation error or return value from
	379	* qdio_allocate
	380	*/
	381	int zfcp_qdio_allocate(struct zfcp_adapter *adapter)
	382	{
	383	struct qdio_initialize *init_data;
	384
	385	if (zfcp_qdio_buffers_enqueue(adapter->req_q.sbal) \|\|
	386	zfcp_qdio_buffers_enqueue(adapter->resp_q.sbal))
	387	return -ENOMEM;
	388
	389	init_data = &adapter->qdio_init_data;
	390
	391	init_data->cdev = adapter->ccw_device;
	392	init_data->q_format = QDIO_ZFCP_QFMT;
	393	memcpy(init_data->adapter_name, zfcp_get_busid_by_adapter(adapter), 8);
	394	ASCEBC(init_data->adapter_name, 8);
	395	init_data->qib_param_field_format = 0;
	396	init_data->qib_param_field = NULL;
	397	init_data->input_slib_elements = NULL;
	398	init_data->output_slib_elements = NULL;
00bab910 SS	399	init_data->no_input_qs = 1;
	400	init_data->no_output_qs = 1;
	401	init_data->input_handler = zfcp_qdio_int_resp;
	402	init_data->output_handler = zfcp_qdio_int_req;
	403	init_data->int_parm = (unsigned long) adapter;
	404	init_data->flags = QDIO_INBOUND_0COPY_SBALS \|
	405	QDIO_OUTBOUND_0COPY_SBALS \| QDIO_USE_OUTBOUND_PCIS;
	406	init_data->input_sbal_addr_array =
	407	(void **) (adapter->resp_q.sbal);
	408	init_data->output_sbal_addr_array =
	409	(void **) (adapter->req_q.sbal);
	410
	411	return qdio_allocate(init_data);
	412	}
	413
	414	/**
	415	* zfcp_close_qdio - close qdio queues for an adapter
1da177e4	416	*/
00bab910	417	void zfcp_qdio_close(struct zfcp_adapter *adapter)
1da177e4	418	{
00bab910 SS	419	struct zfcp_qdio_queue *req_q;
	420	int first, count;
	421
	422	if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
	423	return;
	424
	425	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
	426	req_q = &adapter->req_q;
d4538817	427	spin_lock_bh(&req_q->lock);
00bab910	428	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
d4538817	429	spin_unlock_bh(&req_q->lock);
00bab910	430
779e6e1c	431	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
00bab910 SS	432
	433	/* cleanup used outbound sbals */
	434	count = atomic_read(&req_q->count);
	435	if (count < QDIO_MAX_BUFFERS_PER_Q) {
	436	first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q;
	437	count = QDIO_MAX_BUFFERS_PER_Q - count;
	438	zfcp_qdio_zero_sbals(req_q->sbal, first, count);
1da177e4	439	}
00bab910 SS	440	req_q->first = 0;
	441	atomic_set(&req_q->count, 0);
	442	req_q->pci_batch = 0;
	443	adapter->resp_q.first = 0;
	444	atomic_set(&adapter->resp_q.count, 0);
1da177e4 LT	445	}
1da177e4 LT	446
00bab910 SS	447	/**
	448	* zfcp_qdio_open - prepare and initialize response queue
	449	* @adapter: pointer to struct zfcp_adapter
	450	* Returns: 0 on success, otherwise -EIO
	451	*/
	452	int zfcp_qdio_open(struct zfcp_adapter *adapter)
	453	{
	454	volatile struct qdio_buffer_element *sbale;
	455	int cc;
	456
	457	if (atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
	458	return -EIO;
	459
	460	if (qdio_establish(&adapter->qdio_init_data)) {
	461	dev_err(&adapter->ccw_device->dev,
	462	"Establish of QDIO queues failed.\n");
	463	return -EIO;
	464	}
	465
779e6e1c	466	if (qdio_activate(adapter->ccw_device)) {
00bab910 SS	467	dev_err(&adapter->ccw_device->dev,
	468	"Activate of QDIO queues failed.\n");
	469	goto failed_qdio;
	470	}
	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,
779e6e1c	480	QDIO_MAX_BUFFERS_PER_Q)) {
00bab910 SS	481	dev_err(&adapter->ccw_device->dev,
	482	"Init of QDIO response queue failed.\n");
	483	goto failed_qdio;
	484	}
	485
	486	/* set index of first avalable SBALS / number of available SBALS */
	487	adapter->req_q.first = 0;
	488	atomic_set(&adapter->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
	489	adapter->req_q.pci_batch = 0;
	490
	491	return 0;
	492
	493	failed_qdio:
779e6e1c	494	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
00bab910 SS	495	return -EIO;
00bab910 SS	496	}