/*
- * 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, 2008
*/
#include "zfcp_ext.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
-
-/*
- * 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]);
-}
+/* 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))
-/*
- * 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 volatile struct qdio_buffer_element *
+zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
{
- int ret;
-
- ret = zfcp_qdio_buffers_enqueue(adapter->request_queue.buffer);
- if (ret)
- return ret;
- return zfcp_qdio_buffers_enqueue(adapter->response_queue.buffer);
+ return &q->sbal[sbal_idx]->element[sbale_idx];
}
-/* locks: must only be called with zfcp_data.config_sema taken */
-void
-zfcp_qdio_free_queues(struct zfcp_adapter *adapter)
+/**
+ * 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)
{
- ZFCP_LOG_TRACE("freeing request_queue buffers\n");
- zfcp_qdio_buffers_dequeue(adapter->request_queue.buffer);
+ struct qdio_buffer **sbal_req, **sbal_resp;
+ int p;
- ZFCP_LOG_TRACE("freeing response_queue buffers\n");
- zfcp_qdio_buffers_dequeue(adapter->response_queue.buffer);
-}
+ if (adapter->ccw_device)
+ qdio_free(adapter->ccw_device);
-int
-zfcp_qdio_allocate(struct zfcp_adapter *adapter)
-{
- struct qdio_initialize *init_data;
+ sbal_req = adapter->req_q.sbal;
+ sbal_resp = adapter->resp_q.sbal;
- init_data = &adapter->qdio_init_data;
+ 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]);
+ }
+}
- 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);
+static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, u8 id)
+{
+ dev_warn(&adapter->ccw_device->dev, "QDIO problem occurred.\n");
- return qdio_allocate(init_data);
+ zfcp_erp_adapter_reopen(adapter,
+ ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
+ ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
}
-/*
- * 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_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
{
- 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);
+ 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));
}
- 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)
+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_qdio_queue *queue;
-
- adapter = (struct zfcp_adapter *) int_parm;
- queue = &adapter->request_queue;
+ struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
+ struct zfcp_qdio_queue *queue = &adapter->req_q;
- 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
- */
+ 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->buffer, first_element, elements_processed);
+ zfcp_qdio_zero_sbals(queue->sbal, first, count);
- /* 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));
+ atomic_add(count, &queue->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_reqid_check - checks for valid reqids.
- */
static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
- unsigned long req_id)
+ unsigned long req_id, int sbal_idx)
{
struct zfcp_fsf_req *fsf_req;
unsigned long flags;
* 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",
+ panic("error: unknown request id (%lx) on adapter %s.\n",
req_id, zfcp_get_busid_by_adapter(adapter));
zfcp_reqlist_remove(adapter, fsf_req);
- atomic_dec(&adapter->reqs_active);
spin_unlock_irqrestore(&adapter->req_list_lock, flags);
- /* finish the FSF request */
+ fsf_req->sbal_response = sbal_idx;
zfcp_fsf_req_complete(fsf_req);
}
-/*
- * 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_resp_put_back(struct zfcp_adapter *adapter, int processed)
{
- 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;
+ struct zfcp_qdio_queue *queue = &adapter->resp_q;
+ struct ccw_device *cdev = adapter->ccw_device;
+ u8 count, start = queue->first;
+ unsigned int retval;
- /*
- * we stored address of struct zfcp_adapter data structure
- * associated with irq in int_parm
- */
+ 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;
+ }
- 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];
+ 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) 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))
+ (unsigned long) sbale->addr,
+ sbal_idx);
+ if (likely(sbale->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");
- }
+ 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)
*/
- 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_resp_put_back(adapter, count);
}
/**
- * 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
+ * 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 *fsf_req, int sbal, int sbale)
+zfcp_qdio_sbale_req(struct zfcp_fsf_req *req)
{
- return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue,
- sbal, sbale);
+ return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0);
}
/**
- * 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_sbale_curr - return current SBALE on request_queue for
- * a struct zfcp_fsf_req
+ * 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 *fsf_req)
+zfcp_qdio_sbale_curr(struct zfcp_fsf_req *req)
{
- return zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr,
- fsf_req->sbale_curr);
+ return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last,
+ 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)
+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(&fsf_req->adapter->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;
+ fsf_req->sbal_limit = (fsf_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)
{
sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
/* don't exceed last allowed SBAL */
- if (fsf_req->sbal_curr == fsf_req->sbal_last)
+ 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, fsf_req->sbal_curr, 0);
+ sbale = zfcp_qdio_sbale_req(fsf_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;
+ 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++;
return sbale;
}
-/**
- * zfcp_qdio_sbale_next - switch to next SBALE, chain SBALs if needed
- */
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);
}
-/**
- * zfcp_qdio_sbals_zero - initialize SBALs between first and last in queue
- * with zero from
- */
-static int
-zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *queue, int first, int last)
-{
- 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++;
- }
- return count;
-}
-
-
-/**
- * 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_undo_sbals(struct zfcp_fsf_req *fsf_req)
{
- return zfcp_qdio_sbals_zero(&fsf_req->adapter->request_queue,
- fsf_req->sbal_first, fsf_req->sbal_curr);
+ 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);
}
-
-/**
- * zfcp_qdio_sbale_fill - set address and length in current SBALE
- * on request_queue
- */
-static void
-zfcp_qdio_sbale_fill(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
- void *addr, int length)
+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;
-
- sbale = zfcp_qdio_sbale_curr(fsf_req);
- sbale->addr = addr;
- sbale->length = length;
-}
-
-/**
- * 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.
- */
-static int
-zfcp_qdio_sbals_from_segment(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
- void *start_addr, unsigned long total_length)
-{
unsigned long remaining, length;
void *addr;
- /* split segment up heeding page boundaries */
+ /* split segment up */
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);
+ sbale = zfcp_qdio_sbale_next(fsf_req, sbtype);
+ if (!sbale) {
+ zfcp_qdio_undo_sbals(fsf_req);
return -EINVAL;
}
- /* calculate length of new piece */
+
+ /* new piece must not exceed next page boundary */
length = min(remaining,
- (PAGE_SIZE - ((unsigned long) addr &
+ (PAGE_SIZE - ((unsigned long)addr &
(PAGE_SIZE - 1))));
- /* fill current SBALE with calculated piece */
- zfcp_qdio_sbale_fill(fsf_req, sbtype, addr, length);
+ sbale->addr = addr;
+ sbale->length = length;
}
- return total_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
- * @sg_count: number of elements in 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 *sgl, int sg_count, int max_sbals)
+int zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
+ struct scatterlist *sg, int max_sbals)
{
- int sg_index;
- struct scatterlist *sg_segment;
- int retval;
volatile struct qdio_buffer_element *sbale;
- int bytes = 0;
+ int retval, bytes = 0;
/* 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);
+ /* set storage-block type for this request */
+ sbale = zfcp_qdio_sbale_req(fsf_req);
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;
+ 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;
-out:
+
return bytes;
}
-
/**
- * 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
+ * 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_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req,
- unsigned long sbtype, struct scsi_cmnd *scsi_cmnd)
+int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
{
- return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, scsi_sglist(scsi_cmnd),
- scsi_sg_count(scsi_cmnd),
- ZFCP_MAX_SBALS_PER_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_determine_pci - set PCI flag in first SBALE on qdio queue if needed
+ * 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_determine_pci(struct zfcp_qdio_queue *req_queue,
- struct zfcp_fsf_req *fsf_req)
+int zfcp_qdio_allocate(struct zfcp_adapter *adapter)
{
- int new_distance_from_int;
- int pci_pos;
- volatile struct qdio_buffer_element *sbale;
+ struct qdio_initialize *init_data;
- 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;
- }
- return new_distance_from_int;
+ 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);
}
-/*
- * function: zfcp_zero_sbals
- *
- * purpose: zeros specified range of SBALs
- *
- * returns:
+/**
+ * zfcp_close_qdio - close qdio queues for an adapter
*/
-void
-zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count)
+void zfcp_qdio_close(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_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);
}
-#undef ZFCP_LOG_AREA
+/**
+ * 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;
+}
git.openpandora.org / pandora-kernel.git / blobdiff