513 lines
14 KiB
C
513 lines
14 KiB
C
/*
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* zfcp device driver
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*
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* Setup and helper functions to access QDIO.
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*
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* Copyright IBM Corporation 2002, 2008
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include "zfcp_ext.h"
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/* FIXME(tune): free space should be one max. SBAL chain plus what? */
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#define ZFCP_QDIO_PCI_INTERVAL (QDIO_MAX_BUFFERS_PER_Q \
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- (FSF_MAX_SBALS_PER_REQ + 4))
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#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
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static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
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{
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int pos;
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for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
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sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
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if (!sbal[pos])
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return -ENOMEM;
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}
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for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
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if (pos % QBUFF_PER_PAGE)
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sbal[pos] = sbal[pos - 1] + 1;
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return 0;
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}
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static struct qdio_buffer_element *
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zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
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{
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return &q->sbal[sbal_idx]->element[sbale_idx];
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}
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/**
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* zfcp_qdio_free - free memory used by request- and resposne queue
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* @adapter: pointer to the zfcp_adapter structure
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*/
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void zfcp_qdio_free(struct zfcp_adapter *adapter)
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{
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struct qdio_buffer **sbal_req, **sbal_resp;
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int p;
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if (adapter->ccw_device)
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qdio_free(adapter->ccw_device);
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sbal_req = adapter->req_q.sbal;
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sbal_resp = adapter->resp_q.sbal;
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for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
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free_page((unsigned long) sbal_req[p]);
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free_page((unsigned long) sbal_resp[p]);
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}
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}
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static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, u8 id)
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{
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dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
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zfcp_erp_adapter_reopen(adapter,
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ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
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ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
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}
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static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
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{
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int i, sbal_idx;
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for (i = first; i < first + cnt; i++) {
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sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
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memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
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}
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}
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/* this needs to be called prior to updating the queue fill level */
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static void zfcp_qdio_account(struct zfcp_adapter *adapter)
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{
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ktime_t now;
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s64 span;
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int free, used;
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spin_lock(&adapter->qdio_stat_lock);
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now = ktime_get();
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span = ktime_us_delta(now, adapter->req_q_time);
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free = max(0, atomic_read(&adapter->req_q.count));
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used = QDIO_MAX_BUFFERS_PER_Q - free;
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adapter->req_q_util += used * span;
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adapter->req_q_time = now;
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spin_unlock(&adapter->qdio_stat_lock);
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}
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static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
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int queue_no, int first, int count,
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unsigned long parm)
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{
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struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
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struct zfcp_qdio_queue *queue = &adapter->req_q;
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if (unlikely(qdio_err)) {
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zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
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zfcp_qdio_handler_error(adapter, 140);
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return;
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}
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/* cleanup all SBALs being program-owned now */
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zfcp_qdio_zero_sbals(queue->sbal, first, count);
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zfcp_qdio_account(adapter);
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atomic_add(count, &queue->count);
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wake_up(&adapter->request_wq);
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}
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static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
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unsigned long req_id, int sbal_idx)
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{
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struct zfcp_fsf_req *fsf_req;
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unsigned long flags;
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spin_lock_irqsave(&adapter->req_list_lock, flags);
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fsf_req = zfcp_reqlist_find(adapter, req_id);
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if (!fsf_req)
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/*
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* Unknown request means that we have potentially memory
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* corruption and must stop the machine immediatly.
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*/
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panic("error: unknown request id (%lx) on adapter %s.\n",
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req_id, dev_name(&adapter->ccw_device->dev));
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zfcp_reqlist_remove(adapter, fsf_req);
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spin_unlock_irqrestore(&adapter->req_list_lock, flags);
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fsf_req->sbal_response = sbal_idx;
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fsf_req->qdio_inb_usage = atomic_read(&adapter->resp_q.count);
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zfcp_fsf_req_complete(fsf_req);
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}
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static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed)
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{
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struct zfcp_qdio_queue *queue = &adapter->resp_q;
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struct ccw_device *cdev = adapter->ccw_device;
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u8 count, start = queue->first;
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unsigned int retval;
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count = atomic_read(&queue->count) + processed;
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retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count);
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if (unlikely(retval)) {
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atomic_set(&queue->count, count);
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/* FIXME: Recover this with an adapter reopen? */
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} else {
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queue->first += count;
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queue->first %= QDIO_MAX_BUFFERS_PER_Q;
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atomic_set(&queue->count, 0);
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}
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}
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static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
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int queue_no, int first, int count,
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unsigned long parm)
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{
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struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
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struct zfcp_qdio_queue *queue = &adapter->resp_q;
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struct qdio_buffer_element *sbale;
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int sbal_idx, sbale_idx, sbal_no;
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if (unlikely(qdio_err)) {
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zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
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zfcp_qdio_handler_error(adapter, 147);
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return;
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}
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/*
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* go through all SBALs from input queue currently
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* returned by QDIO layer
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*/
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for (sbal_no = 0; sbal_no < count; sbal_no++) {
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sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
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/* go through all SBALEs of SBAL */
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for (sbale_idx = 0; sbale_idx < QDIO_MAX_ELEMENTS_PER_BUFFER;
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sbale_idx++) {
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sbale = zfcp_qdio_sbale(queue, sbal_idx, sbale_idx);
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zfcp_qdio_reqid_check(adapter,
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(unsigned long) sbale->addr,
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sbal_idx);
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if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
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break;
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};
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if (unlikely(!(sbale->flags & SBAL_FLAGS_LAST_ENTRY)))
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dev_warn(&adapter->ccw_device->dev,
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"A QDIO protocol error occurred, "
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"operations continue\n");
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}
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/*
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* put range of SBALs back to response queue
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* (including SBALs which have already been free before)
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*/
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zfcp_qdio_resp_put_back(adapter, count);
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}
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/**
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* zfcp_qdio_sbale_req - return ptr to SBALE of req_q for a struct zfcp_fsf_req
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* @fsf_req: pointer to struct fsf_req
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* Returns: pointer to qdio_buffer_element (SBALE) structure
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*/
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struct qdio_buffer_element *zfcp_qdio_sbale_req(struct zfcp_fsf_req *req)
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{
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return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0);
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}
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/**
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* zfcp_qdio_sbale_curr - return curr SBALE on req_q for a struct zfcp_fsf_req
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* @fsf_req: pointer to struct fsf_req
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* Returns: pointer to qdio_buffer_element (SBALE) structure
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*/
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struct qdio_buffer_element *zfcp_qdio_sbale_curr(struct zfcp_fsf_req *req)
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{
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return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last,
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req->sbale_curr);
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}
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static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
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{
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int count = atomic_read(&fsf_req->adapter->req_q.count);
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count = min(count, max_sbals);
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fsf_req->sbal_limit = (fsf_req->sbal_first + count - 1)
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% QDIO_MAX_BUFFERS_PER_Q;
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}
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static struct qdio_buffer_element *
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zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
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{
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struct qdio_buffer_element *sbale;
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/* set last entry flag in current SBALE of current SBAL */
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sbale = zfcp_qdio_sbale_curr(fsf_req);
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sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
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/* don't exceed last allowed SBAL */
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if (fsf_req->sbal_last == fsf_req->sbal_limit)
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return NULL;
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/* set chaining flag in first SBALE of current SBAL */
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sbale = zfcp_qdio_sbale_req(fsf_req);
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sbale->flags |= SBAL_FLAGS0_MORE_SBALS;
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/* calculate index of next SBAL */
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fsf_req->sbal_last++;
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fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
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/* keep this requests number of SBALs up-to-date */
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fsf_req->sbal_number++;
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/* start at first SBALE of new SBAL */
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fsf_req->sbale_curr = 0;
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/* set storage-block type for new SBAL */
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sbale = zfcp_qdio_sbale_curr(fsf_req);
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sbale->flags |= sbtype;
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return sbale;
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}
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static struct qdio_buffer_element *
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zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
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{
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if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL)
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return zfcp_qdio_sbal_chain(fsf_req, sbtype);
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fsf_req->sbale_curr++;
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return zfcp_qdio_sbale_curr(fsf_req);
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}
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static void zfcp_qdio_undo_sbals(struct zfcp_fsf_req *fsf_req)
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{
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struct qdio_buffer **sbal = fsf_req->adapter->req_q.sbal;
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int first = fsf_req->sbal_first;
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int last = fsf_req->sbal_last;
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int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) %
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QDIO_MAX_BUFFERS_PER_Q + 1;
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zfcp_qdio_zero_sbals(sbal, first, count);
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}
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static int zfcp_qdio_fill_sbals(struct zfcp_fsf_req *fsf_req,
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unsigned int sbtype, void *start_addr,
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unsigned int total_length)
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{
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struct qdio_buffer_element *sbale;
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unsigned long remaining, length;
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void *addr;
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/* split segment up */
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for (addr = start_addr, remaining = total_length; remaining > 0;
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addr += length, remaining -= length) {
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sbale = zfcp_qdio_sbale_next(fsf_req, sbtype);
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if (!sbale) {
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atomic_inc(&fsf_req->adapter->qdio_outb_full);
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zfcp_qdio_undo_sbals(fsf_req);
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return -EINVAL;
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}
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/* new piece must not exceed next page boundary */
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length = min(remaining,
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(PAGE_SIZE - ((unsigned long)addr &
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(PAGE_SIZE - 1))));
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sbale->addr = addr;
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sbale->length = length;
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}
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return 0;
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}
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/**
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* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
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* @fsf_req: request to be processed
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* @sbtype: SBALE flags
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* @sg: scatter-gather list
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* @max_sbals: upper bound for number of SBALs to be used
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* Returns: number of bytes, or error (negativ)
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*/
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int zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
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struct scatterlist *sg, int max_sbals)
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{
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struct qdio_buffer_element *sbale;
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int retval, bytes = 0;
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/* figure out last allowed SBAL */
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zfcp_qdio_sbal_limit(fsf_req, max_sbals);
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/* set storage-block type for this request */
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sbale = zfcp_qdio_sbale_req(fsf_req);
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sbale->flags |= sbtype;
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for (; sg; sg = sg_next(sg)) {
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retval = zfcp_qdio_fill_sbals(fsf_req, sbtype, sg_virt(sg),
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sg->length);
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if (retval < 0)
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return retval;
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bytes += sg->length;
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}
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/* assume that no other SBALEs are to follow in the same SBAL */
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sbale = zfcp_qdio_sbale_curr(fsf_req);
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sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
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return bytes;
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}
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/**
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* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
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* @fsf_req: pointer to struct zfcp_fsf_req
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* Returns: 0 on success, error otherwise
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*/
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int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
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{
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struct zfcp_adapter *adapter = fsf_req->adapter;
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struct zfcp_qdio_queue *req_q = &adapter->req_q;
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int first = fsf_req->sbal_first;
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int count = fsf_req->sbal_number;
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int retval, pci, pci_batch;
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struct qdio_buffer_element *sbale;
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/* acknowledgements for transferred buffers */
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pci_batch = adapter->req_q_pci_batch + count;
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if (unlikely(pci_batch >= ZFCP_QDIO_PCI_INTERVAL)) {
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pci_batch %= ZFCP_QDIO_PCI_INTERVAL;
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pci = first + count - (pci_batch + 1);
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pci %= QDIO_MAX_BUFFERS_PER_Q;
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sbale = zfcp_qdio_sbale(req_q, pci, 0);
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sbale->flags |= SBAL_FLAGS0_PCI;
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}
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zfcp_qdio_account(adapter);
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retval = do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, first,
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count);
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if (unlikely(retval)) {
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zfcp_qdio_zero_sbals(req_q->sbal, first, count);
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return retval;
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}
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/* account for transferred buffers */
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atomic_sub(count, &req_q->count);
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req_q->first += count;
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req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
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adapter->req_q_pci_batch = pci_batch;
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return 0;
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}
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/**
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* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
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* @adapter: pointer to struct zfcp_adapter
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* Returns: -ENOMEM on memory allocation error or return value from
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* qdio_allocate
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*/
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int zfcp_qdio_allocate(struct zfcp_adapter *adapter)
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{
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struct qdio_initialize *init_data;
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if (zfcp_qdio_buffers_enqueue(adapter->req_q.sbal) ||
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zfcp_qdio_buffers_enqueue(adapter->resp_q.sbal))
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return -ENOMEM;
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init_data = &adapter->qdio_init_data;
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init_data->cdev = adapter->ccw_device;
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init_data->q_format = QDIO_ZFCP_QFMT;
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memcpy(init_data->adapter_name, dev_name(&adapter->ccw_device->dev), 8);
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ASCEBC(init_data->adapter_name, 8);
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init_data->qib_param_field_format = 0;
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init_data->qib_param_field = NULL;
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init_data->input_slib_elements = NULL;
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init_data->output_slib_elements = NULL;
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init_data->no_input_qs = 1;
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init_data->no_output_qs = 1;
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init_data->input_handler = zfcp_qdio_int_resp;
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init_data->output_handler = zfcp_qdio_int_req;
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init_data->int_parm = (unsigned long) adapter;
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init_data->flags = QDIO_INBOUND_0COPY_SBALS |
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QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS;
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init_data->input_sbal_addr_array =
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(void **) (adapter->resp_q.sbal);
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init_data->output_sbal_addr_array =
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(void **) (adapter->req_q.sbal);
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return qdio_allocate(init_data);
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}
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/**
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* zfcp_close_qdio - close qdio queues for an adapter
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*/
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void zfcp_qdio_close(struct zfcp_adapter *adapter)
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{
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struct zfcp_qdio_queue *req_q;
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int first, count;
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if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
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return;
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/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
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req_q = &adapter->req_q;
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spin_lock_bh(&adapter->req_q_lock);
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atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
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spin_unlock_bh(&adapter->req_q_lock);
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|
|
qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
|
|
|
|
/* cleanup used outbound sbals */
|
|
count = atomic_read(&req_q->count);
|
|
if (count < QDIO_MAX_BUFFERS_PER_Q) {
|
|
first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q;
|
|
count = QDIO_MAX_BUFFERS_PER_Q - count;
|
|
zfcp_qdio_zero_sbals(req_q->sbal, first, count);
|
|
}
|
|
req_q->first = 0;
|
|
atomic_set(&req_q->count, 0);
|
|
adapter->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)
|
|
{
|
|
struct qdio_buffer_element *sbale;
|
|
int cc;
|
|
|
|
if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
|
|
return -EIO;
|
|
|
|
if (qdio_establish(&adapter->qdio_init_data))
|
|
goto failed_establish;
|
|
|
|
if (qdio_activate(adapter->ccw_device))
|
|
goto failed_qdio;
|
|
|
|
for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
|
|
sbale = &(adapter->resp_q.sbal[cc]->element[0]);
|
|
sbale->length = 0;
|
|
sbale->flags = SBAL_FLAGS_LAST_ENTRY;
|
|
sbale->addr = NULL;
|
|
}
|
|
|
|
if (do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_INPUT, 0, 0,
|
|
QDIO_MAX_BUFFERS_PER_Q))
|
|
goto failed_qdio;
|
|
|
|
/* set index of first avalable SBALS / number of available SBALS */
|
|
adapter->req_q.first = 0;
|
|
atomic_set(&adapter->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
|
|
adapter->req_q_pci_batch = 0;
|
|
|
|
return 0;
|
|
|
|
failed_qdio:
|
|
qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
|
|
failed_establish:
|
|
dev_err(&adapter->ccw_device->dev,
|
|
"Setting up the QDIO connection to the FCP adapter failed\n");
|
|
return -EIO;
|
|
}
|