/*
- * This file is part of the zfcp device driver for
- * FCP adapters for IBM System z9 and zSeries.
+ * zfcp device driver
*
- * (C) Copyright IBM Corp. 2002, 2006
+ * Setup and helper functions to access QDIO.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Copyright IBM Corporation 2002, 2010
*/
+#define KMSG_COMPONENT "zfcp"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/slab.h>
#include "zfcp_ext.h"
+#include "zfcp_qdio.h"
-static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *, int);
-static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_get
- (struct zfcp_qdio_queue *, int, int);
-static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_resp
- (struct zfcp_fsf_req *, int, int);
-static volatile struct qdio_buffer_element *zfcp_qdio_sbal_chain
- (struct zfcp_fsf_req *, unsigned long);
-static volatile struct qdio_buffer_element *zfcp_qdio_sbale_next
- (struct zfcp_fsf_req *, unsigned long);
-static int zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *, int, int);
-static inline int zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *);
-static void zfcp_qdio_sbale_fill
- (struct zfcp_fsf_req *, unsigned long, void *, int);
-static int zfcp_qdio_sbals_from_segment
- (struct zfcp_fsf_req *, unsigned long, void *, unsigned long);
-
-static qdio_handler_t zfcp_qdio_request_handler;
-static qdio_handler_t zfcp_qdio_response_handler;
-static int zfcp_qdio_handler_error_check(struct zfcp_adapter *,
- unsigned int, unsigned int, unsigned int, int, int);
-
-#define ZFCP_LOG_AREA ZFCP_LOG_AREA_QDIO
+#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
-/*
- * Frees BUFFER memory for each of the pointers of the struct qdio_buffer array
- * in the adapter struct sbuf is the pointer array.
- *
- * locks: must only be called with zfcp_data.config_sema taken
- */
-static void
-zfcp_qdio_buffers_dequeue(struct qdio_buffer **sbuf)
-{
- int pos;
-
- for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE)
- free_page((unsigned long) sbuf[pos]);
-}
-
-/*
- * Allocates BUFFER memory to each of the pointers of the qdio_buffer_t
- * array in the adapter struct.
- * Cur_buf is the pointer array
- *
- * returns: zero on success else -ENOMEM
- * locks: must only be called with zfcp_data.config_sema taken
- */
-static int
-zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbuf)
+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) {
- sbuf[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
- if (!sbuf[pos]) {
- zfcp_qdio_buffers_dequeue(sbuf);
+ 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)
- sbuf[pos] = sbuf[pos - 1] + 1;
+ sbal[pos] = sbal[pos - 1] + 1;
return 0;
}
-/* locks: must only be called with zfcp_data.config_sema taken */
-int
-zfcp_qdio_allocate_queues(struct zfcp_adapter *adapter)
+static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id)
{
- int ret;
+ struct zfcp_adapter *adapter = qdio->adapter;
+
+ dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
- ret = zfcp_qdio_buffers_enqueue(adapter->request_queue.buffer);
- if (ret)
- return ret;
- return zfcp_qdio_buffers_enqueue(adapter->response_queue.buffer);
+ zfcp_erp_adapter_reopen(adapter,
+ ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
+ ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
}
-/* locks: must only be called with zfcp_data.config_sema taken */
-void
-zfcp_qdio_free_queues(struct zfcp_adapter *adapter)
+static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
{
- ZFCP_LOG_TRACE("freeing request_queue buffers\n");
- zfcp_qdio_buffers_dequeue(adapter->request_queue.buffer);
+ int i, sbal_idx;
- ZFCP_LOG_TRACE("freeing response_queue buffers\n");
- zfcp_qdio_buffers_dequeue(adapter->response_queue.buffer);
+ for (i = first; i < first + cnt; i++) {
+ sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
+ memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
+ }
}
-int
-zfcp_qdio_allocate(struct zfcp_adapter *adapter)
+/* this needs to be called prior to updating the queue fill level */
+static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
{
- struct qdio_initialize *init_data;
-
- init_data = &adapter->qdio_init_data;
-
- init_data->cdev = adapter->ccw_device;
- init_data->q_format = QDIO_SCSI_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->min_input_threshold = ZFCP_MIN_INPUT_THRESHOLD;
- init_data->max_input_threshold = ZFCP_MAX_INPUT_THRESHOLD;
- init_data->min_output_threshold = ZFCP_MIN_OUTPUT_THRESHOLD;
- init_data->max_output_threshold = ZFCP_MAX_OUTPUT_THRESHOLD;
- init_data->no_input_qs = 1;
- init_data->no_output_qs = 1;
- init_data->input_handler = zfcp_qdio_response_handler;
- init_data->output_handler = zfcp_qdio_request_handler;
- 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->response_queue.buffer);
- init_data->output_sbal_addr_array =
- (void **) (adapter->request_queue.buffer);
-
- return qdio_allocate(init_data);
+ unsigned long long now, span;
+ int free, used;
+
+ spin_lock(&qdio->stat_lock);
+ now = get_clock_monotonic();
+ span = (now - qdio->req_q_time) >> 12;
+ free = atomic_read(&qdio->req_q.count);
+ used = QDIO_MAX_BUFFERS_PER_Q - free;
+ qdio->req_q_util += used * span;
+ qdio->req_q_time = now;
+ spin_unlock(&qdio->stat_lock);
}
-/*
- * function: zfcp_qdio_handler_error_check
- *
- * purpose: called by the response handler to determine error condition
- *
- * returns: error flag
- *
- */
-static int
-zfcp_qdio_handler_error_check(struct zfcp_adapter *adapter, unsigned int status,
- unsigned int qdio_error, unsigned int siga_error,
- int first_element, int elements_processed)
+static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
+ int queue_no, int first, int count,
+ unsigned long parm)
{
- int retval = 0;
-
- if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
- retval = -EIO;
-
- ZFCP_LOG_INFO("QDIO problem occurred (status=0x%x, "
- "qdio_error=0x%x, siga_error=0x%x)\n",
- status, qdio_error, siga_error);
-
- zfcp_hba_dbf_event_qdio(adapter, status, qdio_error, siga_error,
- first_element, elements_processed);
- /*
- * Restarting IO on the failed adapter from scratch.
- * Since we have been using this adapter, it is save to assume
- * that it is not failed but recoverable. The card seems to
- * report link-up events by self-initiated queue shutdown.
- * That is why we need to clear the link-down flag
- * which is set again in case we have missed by a mile.
- */
- zfcp_erp_adapter_reopen(adapter,
- ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
- ZFCP_STATUS_COMMON_ERP_FAILED, 140, 0);
+ struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
+ struct zfcp_qdio_queue *queue = &qdio->req_q;
+
+ if (unlikely(qdio_err)) {
+ zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, first,
+ count);
+ zfcp_qdio_handler_error(qdio, "qdireq1");
+ return;
}
- return retval;
-}
-
-/*
- * function: zfcp_qdio_request_handler
- *
- * purpose: is called by QDIO layer for completed SBALs in request queue
- *
- * returns: (void)
- */
-static void
-zfcp_qdio_request_handler(struct ccw_device *ccw_device,
- unsigned int status,
- unsigned int qdio_error,
- unsigned int siga_error,
- unsigned int queue_number,
- int first_element,
- int elements_processed,
- unsigned long int_parm)
-{
- struct zfcp_adapter *adapter;
- struct zfcp_qdio_queue *queue;
-
- adapter = (struct zfcp_adapter *) int_parm;
- queue = &adapter->request_queue;
-
- ZFCP_LOG_DEBUG("adapter %s, first=%d, elements_processed=%d\n",
- zfcp_get_busid_by_adapter(adapter),
- first_element, elements_processed);
-
- if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error,
- siga_error, first_element,
- elements_processed)))
- goto out;
- /*
- * we stored address of struct zfcp_adapter data structure
- * associated with irq in int_parm
- */
/* cleanup all SBALs being program-owned now */
- zfcp_qdio_zero_sbals(queue->buffer, first_element, elements_processed);
-
- /* increase free space in outbound queue */
- atomic_add(elements_processed, &queue->free_count);
- ZFCP_LOG_DEBUG("free_count=%d\n", atomic_read(&queue->free_count));
- wake_up(&adapter->request_wq);
- ZFCP_LOG_DEBUG("elements_processed=%d, free count=%d\n",
- elements_processed, atomic_read(&queue->free_count));
- out:
- return;
+ zfcp_qdio_zero_sbals(queue->sbal, first, count);
+
+ zfcp_qdio_account(qdio);
+ atomic_add(count, &queue->count);
+ wake_up(&qdio->req_q_wq);
}
-/**
- * zfcp_qdio_reqid_check - checks for valid reqids.
- */
-static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
- unsigned long req_id)
+static void zfcp_qdio_resp_put_back(struct zfcp_qdio *qdio, int processed)
{
- struct zfcp_fsf_req *fsf_req;
- unsigned long flags;
-
- debug_long_event(adapter->erp_dbf, 4, req_id);
-
- spin_lock_irqsave(&adapter->req_list_lock, flags);
- fsf_req = zfcp_reqlist_find(adapter, req_id);
+ struct zfcp_qdio_queue *queue = &qdio->resp_q;
+ struct ccw_device *cdev = qdio->adapter->ccw_device;
+ u8 count, start = queue->first;
+ unsigned int retval;
- if (!fsf_req)
- /*
- * Unknown request means that we have potentially memory
- * corruption and must stop the machine immediatly.
- */
- panic("error: unknown request id (%ld) on adapter %s.\n",
- req_id, zfcp_get_busid_by_adapter(adapter));
+ count = atomic_read(&queue->count) + processed;
- zfcp_reqlist_remove(adapter, fsf_req);
- atomic_dec(&adapter->reqs_active);
- spin_unlock_irqrestore(&adapter->req_list_lock, flags);
+ retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count);
- /* finish the FSF request */
- zfcp_fsf_req_complete(fsf_req);
+ if (unlikely(retval)) {
+ atomic_set(&queue->count, count);
+ zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdrpb_1", NULL);
+ } else {
+ queue->first += count;
+ queue->first %= QDIO_MAX_BUFFERS_PER_Q;
+ atomic_set(&queue->count, 0);
+ }
}
-/*
- * function: zfcp_qdio_response_handler
- *
- * purpose: is called by QDIO layer for completed SBALs in response queue
- *
- * returns: (void)
- */
-static void
-zfcp_qdio_response_handler(struct ccw_device *ccw_device,
- unsigned int status,
- unsigned int qdio_error,
- unsigned int siga_error,
- unsigned int queue_number,
- int first_element,
- int elements_processed,
- unsigned long int_parm)
+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_qdio_queue *queue;
- int buffer_index;
- int i;
- struct qdio_buffer *buffer;
- int retval = 0;
- u8 count;
- u8 start;
- volatile struct qdio_buffer_element *buffere = NULL;
- int buffere_index;
-
- adapter = (struct zfcp_adapter *) int_parm;
- queue = &adapter->response_queue;
-
- if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error,
- siga_error, first_element,
- elements_processed)))
- goto out;
-
- /*
- * we stored address of struct zfcp_adapter data structure
- * associated with irq in int_parm
- */
+ struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
+ int sbal_idx, sbal_no;
+
+ if (unlikely(qdio_err)) {
+ zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, first,
+ count);
+ zfcp_qdio_handler_error(qdio, "qdires1");
+ return;
+ }
- buffere = &(queue->buffer[first_element]->element[0]);
- ZFCP_LOG_DEBUG("first BUFFERE flags=0x%x\n", buffere->flags);
/*
* go through all SBALs from input queue currently
* returned by QDIO layer
*/
-
- for (i = 0; i < elements_processed; i++) {
-
- buffer_index = first_element + i;
- buffer_index %= QDIO_MAX_BUFFERS_PER_Q;
- buffer = queue->buffer[buffer_index];
-
+ 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 (buffere_index = 0;
- buffere_index < QDIO_MAX_ELEMENTS_PER_BUFFER;
- buffere_index++) {
-
- /* look for QDIO request identifiers in SB */
- buffere = &buffer->element[buffere_index];
- zfcp_qdio_reqid_check(adapter,
- (unsigned long) buffere->addr);
-
- /*
- * A single used SBALE per inbound SBALE has been
- * implemented by QDIO so far. Hope they will
- * do some optimisation. Will need to change to
- * unlikely() then.
- */
- if (likely(buffere->flags & SBAL_FLAGS_LAST_ENTRY))
- break;
- };
-
- if (unlikely(!(buffere->flags & SBAL_FLAGS_LAST_ENTRY))) {
- ZFCP_LOG_NORMAL("bug: End of inbound data "
- "not marked!\n");
- }
+ zfcp_fsf_reqid_check(qdio, sbal_idx);
}
/*
* put range of SBALs back to response queue
* (including SBALs which have already been free before)
*/
- count = atomic_read(&queue->free_count) + elements_processed;
- start = queue->free_index;
-
- ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, "
- "queue_no=%i, index_in_queue=%i, count=%i, "
- "buffers=0x%lx\n",
- zfcp_get_busid_by_adapter(adapter),
- QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
- 0, start, count, (unsigned long) &queue->buffer[start]);
-
- retval = do_QDIO(ccw_device,
- QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
- 0, start, count, NULL);
-
- if (unlikely(retval)) {
- atomic_set(&queue->free_count, count);
- ZFCP_LOG_DEBUG("clearing of inbound data regions failed, "
- "queues may be down "
- "(count=%d, start=%d, retval=%d)\n",
- count, start, retval);
- } else {
- queue->free_index += count;
- queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;
- atomic_set(&queue->free_count, 0);
- ZFCP_LOG_TRACE("%i buffers enqueued to response "
- "queue at position %i\n", count, start);
- }
- out:
- return;
-}
-
-/**
- * zfcp_qdio_sbale_get - return pointer to SBALE of qdio_queue
- * @queue: queue from which SBALE should be returned
- * @sbal: specifies number of SBAL in queue
- * @sbale: specifes number of SBALE in SBAL
- */
-static inline volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_get(struct zfcp_qdio_queue *queue, int sbal, int sbale)
-{
- return &queue->buffer[sbal]->element[sbale];
-}
-
-/**
- * zfcp_qdio_sbale_req - return pointer to SBALE of request_queue for
- * a struct zfcp_fsf_req
- */
-volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_req(struct zfcp_fsf_req *fsf_req, int sbal, int sbale)
-{
- return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue,
- sbal, sbale);
-}
-
-/**
- * zfcp_qdio_sbale_resp - return pointer to SBALE of response_queue for
- * a struct zfcp_fsf_req
- */
-static inline volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_resp(struct zfcp_fsf_req *fsf_req, int sbal, int sbale)
-{
- return zfcp_qdio_sbale_get(&fsf_req->adapter->response_queue,
- sbal, sbale);
+ zfcp_qdio_resp_put_back(qdio, count);
}
-/**
- * zfcp_qdio_sbale_curr - return current SBALE on request_queue for
- * a struct zfcp_fsf_req
- */
-volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_curr(struct zfcp_fsf_req *fsf_req)
+static void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
+ struct zfcp_qdio_req *q_req, int max_sbals)
{
- return zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr,
- fsf_req->sbale_curr);
-}
-
-/**
- * zfcp_qdio_sbal_limit - determine maximum number of SBALs that can be used
- * on the request_queue for a struct zfcp_fsf_req
- * @fsf_req: the number of the last SBAL that can be used is stored herein
- * @max_sbals: used to pass an upper limit for the number of SBALs
- *
- * Note: We can assume at least one free SBAL in the request_queue when called.
- */
-static void
-zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
-{
- int count = atomic_read(&fsf_req->adapter->request_queue.free_count);
+ int count = atomic_read(&qdio->req_q.count);
count = min(count, max_sbals);
- fsf_req->sbal_last = fsf_req->sbal_first;
- fsf_req->sbal_last += (count - 1);
- fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
+ q_req->sbal_limit = (q_req->sbal_first + count - 1)
+ % QDIO_MAX_BUFFERS_PER_Q;
}
-/**
- * zfcp_qdio_sbal_chain - chain SBALs if more than one SBAL is needed for a
- * request
- * @fsf_req: zfcp_fsf_req to be processed
- * @sbtype: SBAL flags which have to be set in first SBALE of new SBAL
- *
- * This function changes sbal_curr, sbale_curr, sbal_number of fsf_req.
- */
-static volatile struct qdio_buffer_element *
-zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
+static struct qdio_buffer_element *
+zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
- volatile struct qdio_buffer_element *sbale;
+ struct qdio_buffer_element *sbale;
/* set last entry flag in current SBALE of current SBAL */
- sbale = zfcp_qdio_sbale_curr(fsf_req);
+ sbale = zfcp_qdio_sbale_curr(qdio, q_req);
sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
/* don't exceed last allowed SBAL */
- if (fsf_req->sbal_curr == fsf_req->sbal_last)
+ 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(fsf_req, fsf_req->sbal_curr, 0);
+ sbale = zfcp_qdio_sbale_req(qdio, q_req);
sbale->flags |= SBAL_FLAGS0_MORE_SBALS;
/* calculate index of next SBAL */
- fsf_req->sbal_curr++;
- fsf_req->sbal_curr %= QDIO_MAX_BUFFERS_PER_Q;
+ q_req->sbal_last++;
+ q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
/* keep this requests number of SBALs up-to-date */
- fsf_req->sbal_number++;
+ q_req->sbal_number++;
/* start at first SBALE of new SBAL */
- fsf_req->sbale_curr = 0;
+ q_req->sbale_curr = 0;
/* set storage-block type for new SBAL */
- sbale = zfcp_qdio_sbale_curr(fsf_req);
- sbale->flags |= sbtype;
+ sbale = zfcp_qdio_sbale_curr(qdio, q_req);
+ sbale->flags |= 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 == ZFCP_QDIO_LAST_SBALE_PER_SBAL)
+ return zfcp_qdio_sbal_chain(qdio, q_req);
+ q_req->sbale_curr++;
+ return zfcp_qdio_sbale_curr(qdio, q_req);
+}
+
+static void zfcp_qdio_undo_sbals(struct zfcp_qdio *qdio,
+ struct zfcp_qdio_req *q_req)
+{
+ struct qdio_buffer **sbal = qdio->req_q.sbal;
+ int first = q_req->sbal_first;
+ int last = q_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);
+}
+
/**
- * zfcp_qdio_sbale_next - switch to next SBALE, chain SBALs if needed
+ * 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: number of bytes, or error (negativ)
*/
-static volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
+int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
+ struct scatterlist *sg, int max_sbals)
{
- if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL)
- return zfcp_qdio_sbal_chain(fsf_req, sbtype);
+ struct qdio_buffer_element *sbale;
+ int bytes = 0;
+
+ /* figure out last allowed SBAL */
+ zfcp_qdio_sbal_limit(qdio, q_req, max_sbals);
+
+ /* set storage-block type for this request */
+ sbale = zfcp_qdio_sbale_req(qdio, q_req);
+ sbale->flags |= 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_undo_sbals(qdio, q_req);
+ return -EINVAL;
+ }
+
+ sbale->addr = sg_virt(sg);
+ sbale->length = sg->length;
- fsf_req->sbale_curr++;
+ bytes += sg->length;
+ }
+
+ /* assume that no other SBALEs are to follow in the same SBAL */
+ sbale = zfcp_qdio_sbale_curr(qdio, q_req);
+ sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
- return zfcp_qdio_sbale_curr(fsf_req);
+ return bytes;
}
/**
- * zfcp_qdio_sbals_zero - initialize SBALs between first and last in queue
- * with zero from
+ * 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
*/
-static int
-zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *queue, int first, int last)
+int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
- struct qdio_buffer **buf = queue->buffer;
- int curr = first;
- int count = 0;
-
- for(;;) {
- curr %= QDIO_MAX_BUFFERS_PER_Q;
- count++;
- memset(buf[curr], 0, sizeof(struct qdio_buffer));
- if (curr == last)
- break;
- curr++;
+ struct zfcp_qdio_queue *req_q = &qdio->req_q;
+ int first = q_req->sbal_first;
+ int count = q_req->sbal_number;
+ int retval;
+ unsigned int qdio_flags = QDIO_FLAG_SYNC_OUTPUT;
+
+ zfcp_qdio_account(qdio);
+
+ retval = do_QDIO(qdio->adapter->ccw_device, qdio_flags, 0, first,
+ count);
+ if (unlikely(retval)) {
+ zfcp_qdio_zero_sbals(req_q->sbal, first, count);
+ return retval;
}
- return count;
+
+ /* 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_sbals_wipe - reset all changes in SBALs for an fsf_req
- */
-static inline int
-zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *fsf_req)
+static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
+ struct zfcp_qdio *qdio)
{
- return zfcp_qdio_sbals_zero(&fsf_req->adapter->request_queue,
- fsf_req->sbal_first, fsf_req->sbal_curr);
-}
+ 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_param_field_format = 0;
+ id->qib_param_field = NULL;
+ id->input_slib_elements = NULL;
+ id->output_slib_elements = NULL;
+ 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->resp_q.sbal);
+ id->output_sbal_addr_array = (void **) (qdio->req_q.sbal);
+}
/**
- * zfcp_qdio_sbale_fill - set address and length in current SBALE
- * on request_queue
+ * 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 void
-zfcp_qdio_sbale_fill(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
- void *addr, int length)
+static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
{
- volatile struct qdio_buffer_element *sbale;
+ struct qdio_initialize init_data;
+
+ if (zfcp_qdio_buffers_enqueue(qdio->req_q.sbal) ||
+ zfcp_qdio_buffers_enqueue(qdio->resp_q.sbal))
+ return -ENOMEM;
- sbale = zfcp_qdio_sbale_curr(fsf_req);
- sbale->addr = addr;
- sbale->length = length;
+ zfcp_qdio_setup_init_data(&init_data, qdio);
+
+ return qdio_allocate(&init_data);
}
/**
- * zfcp_qdio_sbals_from_segment - map memory segment to SBALE(s)
- * @fsf_req: request to be processed
- * @sbtype: SBALE flags
- * @start_addr: address of memory segment
- * @total_length: length of memory segment
- *
- * Alignment and length of the segment determine how many SBALEs are needed
- * for the memory segment.
+ * zfcp_close_qdio - close qdio queues for an adapter
+ * @qdio: pointer to structure zfcp_qdio
*/
-static int
-zfcp_qdio_sbals_from_segment(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
- void *start_addr, unsigned long total_length)
+void zfcp_qdio_close(struct zfcp_qdio *qdio)
{
- unsigned long remaining, length;
- void *addr;
-
- /* split segment up heeding page boundaries */
- for (addr = start_addr, remaining = total_length; remaining > 0;
- addr += length, remaining -= length) {
- /* get next free SBALE for new piece */
- if (NULL == zfcp_qdio_sbale_next(fsf_req, sbtype)) {
- /* no SBALE left, clean up and leave */
- zfcp_qdio_sbals_wipe(fsf_req);
- return -EINVAL;
- }
- /* calculate length of new piece */
- length = min(remaining,
- (PAGE_SIZE - ((unsigned long) addr &
- (PAGE_SIZE - 1))));
- /* fill current SBALE with calculated piece */
- zfcp_qdio_sbale_fill(fsf_req, sbtype, addr, length);
+ struct zfcp_qdio_queue *req_q;
+ int first, count;
+
+ if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
+ return;
+
+ /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
+ req_q = &qdio->req_q;
+ spin_lock_bh(&qdio->req_q_lock);
+ atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
+ spin_unlock_bh(&qdio->req_q_lock);
+
+ qdio_shutdown(qdio->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);
}
- return total_length;
+ req_q->first = 0;
+ atomic_set(&req_q->count, 0);
+ qdio->resp_q.first = 0;
+ atomic_set(&qdio->resp_q.count, 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
- * @sg_count: number of elements in scatter-gather list
- * @max_sbals: upper bound for number of SBALs to be used
+ * zfcp_qdio_open - prepare and initialize response queue
+ * @qdio: pointer to struct zfcp_qdio
+ * Returns: 0 on success, otherwise -EIO
*/
-int
-zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
- struct scatterlist *sgl, int sg_count, int max_sbals)
+int zfcp_qdio_open(struct zfcp_qdio *qdio)
{
- int sg_index;
- struct scatterlist *sg_segment;
- int retval;
- volatile struct qdio_buffer_element *sbale;
- int bytes = 0;
+ struct qdio_buffer_element *sbale;
+ struct qdio_initialize init_data;
+ struct ccw_device *cdev = qdio->adapter->ccw_device;
+ int cc;
- /* figure out last allowed SBAL */
- zfcp_qdio_sbal_limit(fsf_req, max_sbals);
-
- /* set storage-block type for current SBAL */
- sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
- sbale->flags |= sbtype;
-
- /* process all segements of scatter-gather list */
- for_each_sg(sgl, sg_segment, sg_count, sg_index) {
- retval = zfcp_qdio_sbals_from_segment(
- fsf_req,
- sbtype,
- zfcp_sg_to_address(sg_segment),
- sg_segment->length);
- if (retval < 0) {
- bytes = retval;
- goto out;
- } else
- bytes += retval;
+ if (atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
+ return -EIO;
+
+ zfcp_qdio_setup_init_data(&init_data, qdio);
+
+ if (qdio_establish(&init_data))
+ goto failed_establish;
+
+ if (qdio_activate(cdev))
+ goto failed_qdio;
+
+ for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
+ sbale = &(qdio->resp_q.sbal[cc]->element[0]);
+ sbale->length = 0;
+ sbale->flags = SBAL_FLAGS_LAST_ENTRY;
+ sbale->addr = NULL;
}
- /* 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;
-out:
- return bytes;
-}
+ if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0,
+ QDIO_MAX_BUFFERS_PER_Q))
+ goto failed_qdio;
-/**
- * zfcp_qdio_sbals_from_scsicmnd - fill SBALs from scsi command
- * @fsf_req: request to be processed
- * @sbtype: SBALE flags
- * @scsi_cmnd: either scatter-gather list or buffer contained herein is used
- * to fill SBALs
- */
-int
-zfcp_qdio_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req,
- unsigned long sbtype, struct scsi_cmnd *scsi_cmnd)
-{
- return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, scsi_sglist(scsi_cmnd),
- scsi_sg_count(scsi_cmnd),
- ZFCP_MAX_SBALS_PER_REQ);
+ /* set index of first avalable SBALS / number of available SBALS */
+ qdio->req_q.first = 0;
+ atomic_set(&qdio->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
+
+ 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;
}
-/**
- * zfcp_qdio_determine_pci - set PCI flag in first SBALE on qdio queue if needed
- */
-int
-zfcp_qdio_determine_pci(struct zfcp_qdio_queue *req_queue,
- struct zfcp_fsf_req *fsf_req)
+void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
{
- int new_distance_from_int;
- int pci_pos;
- volatile struct qdio_buffer_element *sbale;
-
- new_distance_from_int = req_queue->distance_from_int +
- fsf_req->sbal_number;
-
- if (unlikely(new_distance_from_int >= ZFCP_QDIO_PCI_INTERVAL)) {
- new_distance_from_int %= ZFCP_QDIO_PCI_INTERVAL;
- pci_pos = fsf_req->sbal_first;
- pci_pos += fsf_req->sbal_number;
- pci_pos -= new_distance_from_int;
- pci_pos -= 1;
- pci_pos %= QDIO_MAX_BUFFERS_PER_Q;
- sbale = zfcp_qdio_sbale_req(fsf_req, pci_pos, 0);
- sbale->flags |= SBAL_FLAGS0_PCI;
+ struct qdio_buffer **sbal_req, **sbal_resp;
+ int p;
+
+ if (!qdio)
+ return;
+
+ if (qdio->adapter->ccw_device)
+ qdio_free(qdio->adapter->ccw_device);
+
+ sbal_req = qdio->req_q.sbal;
+ sbal_resp = qdio->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]);
}
- return new_distance_from_int;
+
+ kfree(qdio);
}
-/*
- * function: zfcp_zero_sbals
- *
- * purpose: zeros specified range of SBALs
- *
- * returns:
- */
-void
-zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count)
+int zfcp_qdio_setup(struct zfcp_adapter *adapter)
{
- int cur_pos;
- int index;
-
- for (cur_pos = first; cur_pos < (first + clean_count); cur_pos++) {
- index = cur_pos % QDIO_MAX_BUFFERS_PER_Q;
- memset(buf[index], 0, sizeof (struct qdio_buffer));
- ZFCP_LOG_TRACE("zeroing BUFFER %d at address %p\n",
- index, buf[index]);
+ struct zfcp_qdio *qdio;
+
+ qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
+ if (!qdio)
+ return -ENOMEM;
+
+ qdio->adapter = adapter;
+
+ if (zfcp_qdio_allocate(qdio)) {
+ zfcp_qdio_destroy(qdio);
+ return -ENOMEM;
}
+
+ spin_lock_init(&qdio->req_q_lock);
+ spin_lock_init(&qdio->stat_lock);
+
+ adapter->qdio = qdio;
+ return 0;
}
-#undef ZFCP_LOG_AREA