438 lines
11 KiB
C
438 lines
11 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, 2010
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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 <linux/slab.h>
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#include "zfcp_ext.h"
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#include "zfcp_qdio.h"
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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 void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id)
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{
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struct zfcp_adapter *adapter = qdio->adapter;
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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 inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
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{
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unsigned long long now, span;
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int used;
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spin_lock(&qdio->stat_lock);
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now = get_clock_monotonic();
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span = (now - qdio->req_q_time) >> 12;
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used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
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qdio->req_q_util += used * span;
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qdio->req_q_time = now;
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spin_unlock(&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 idx, int count,
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unsigned long parm)
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{
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struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
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if (unlikely(qdio_err)) {
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zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
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zfcp_qdio_handler_error(qdio, "qdireq1");
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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(qdio->req_q, idx, count);
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zfcp_qdio_account(qdio);
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atomic_add(count, &qdio->req_q_free);
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wake_up(&qdio->req_q_wq);
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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 idx, int count,
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unsigned long parm)
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{
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struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
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int sbal_idx, sbal_no;
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if (unlikely(qdio_err)) {
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zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
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zfcp_qdio_handler_error(qdio, "qdires1");
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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 = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
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/* go through all SBALEs of SBAL */
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zfcp_fsf_reqid_check(qdio, sbal_idx);
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}
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/*
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* put SBALs back to response queue
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*/
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if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
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zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2", NULL);
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}
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static struct qdio_buffer_element *
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zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
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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(qdio, q_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 (q_req->sbal_last == q_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(qdio, q_req);
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sbale->flags |= SBAL_FLAGS0_MORE_SBALS;
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/* calculate index of next SBAL */
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q_req->sbal_last++;
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q_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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q_req->sbal_number++;
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BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
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/* start at first SBALE of new SBAL */
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q_req->sbale_curr = 0;
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/* set storage-block type for new SBAL */
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sbale = zfcp_qdio_sbale_curr(qdio, q_req);
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sbale->flags |= q_req->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_qdio *qdio, struct zfcp_qdio_req *q_req)
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{
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if (q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL)
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return zfcp_qdio_sbal_chain(qdio, q_req);
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q_req->sbale_curr++;
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return zfcp_qdio_sbale_curr(qdio, q_req);
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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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* @qdio: pointer to struct zfcp_qdio
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* @q_req: pointer to struct zfcp_qdio_req
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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_qdio *qdio, struct zfcp_qdio_req *q_req,
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struct scatterlist *sg)
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{
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struct qdio_buffer_element *sbale;
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int bytes = 0;
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/* set storage-block type for this request */
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sbale = zfcp_qdio_sbale_req(qdio, q_req);
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sbale->flags |= q_req->sbtype;
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for (; sg; sg = sg_next(sg)) {
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sbale = zfcp_qdio_sbale_next(qdio, q_req);
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if (!sbale) {
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atomic_inc(&qdio->req_q_full);
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zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
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q_req->sbal_number);
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return -EINVAL;
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}
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sbale->addr = sg_virt(sg);
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sbale->length = sg->length;
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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(qdio, q_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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static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
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{
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spin_lock_bh(&qdio->req_q_lock);
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if (atomic_read(&qdio->req_q_free) ||
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!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
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return 1;
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spin_unlock_bh(&qdio->req_q_lock);
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return 0;
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}
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/**
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* zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary
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* @qdio: pointer to struct zfcp_qdio
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*
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* The req_q_lock must be held by the caller of this function, and
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* this function may only be called from process context; it will
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* sleep when waiting for a free sbal.
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*
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* Returns: 0 on success, -EIO if there is no free sbal after waiting.
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*/
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int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
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{
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long ret;
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spin_unlock_bh(&qdio->req_q_lock);
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ret = wait_event_interruptible_timeout(qdio->req_q_wq,
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zfcp_qdio_sbal_check(qdio), 5 * HZ);
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if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
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return -EIO;
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if (ret > 0)
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return 0;
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if (!ret) {
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atomic_inc(&qdio->req_q_full);
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/* assume hanging outbound queue, try queue recovery */
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zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1", NULL);
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}
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spin_lock_bh(&qdio->req_q_lock);
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return -EIO;
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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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* @qdio: pointer to struct zfcp_qdio
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* @q_req: pointer to struct zfcp_qdio_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_qdio *qdio, struct zfcp_qdio_req *q_req)
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{
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int retval;
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u8 sbal_number = q_req->sbal_number;
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zfcp_qdio_account(qdio);
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retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
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q_req->sbal_first, sbal_number);
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if (unlikely(retval)) {
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zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
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sbal_number);
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return retval;
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}
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/* account for transferred buffers */
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atomic_sub(sbal_number, &qdio->req_q_free);
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qdio->req_q_idx += sbal_number;
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qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
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return 0;
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}
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static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
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struct zfcp_qdio *qdio)
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{
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id->cdev = qdio->adapter->ccw_device;
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id->q_format = QDIO_ZFCP_QFMT;
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memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
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ASCEBC(id->adapter_name, 8);
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id->qib_param_field_format = 0;
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id->qib_param_field = NULL;
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id->input_slib_elements = NULL;
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id->output_slib_elements = NULL;
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id->no_input_qs = 1;
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id->no_output_qs = 1;
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id->input_handler = zfcp_qdio_int_resp;
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id->output_handler = zfcp_qdio_int_req;
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id->int_parm = (unsigned long) qdio;
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id->input_sbal_addr_array = (void **) (qdio->res_q);
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id->output_sbal_addr_array = (void **) (qdio->req_q);
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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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static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
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{
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struct qdio_initialize init_data;
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if (zfcp_qdio_buffers_enqueue(qdio->req_q) ||
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zfcp_qdio_buffers_enqueue(qdio->res_q))
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return -ENOMEM;
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zfcp_qdio_setup_init_data(&init_data, qdio);
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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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* @qdio: pointer to structure zfcp_qdio
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*/
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void zfcp_qdio_close(struct zfcp_qdio *qdio)
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{
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struct zfcp_adapter *adapter = qdio->adapter;
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int idx, 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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spin_lock_bh(&qdio->req_q_lock);
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atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
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spin_unlock_bh(&qdio->req_q_lock);
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wake_up(&qdio->req_q_wq);
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qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
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/* cleanup used outbound sbals */
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count = atomic_read(&qdio->req_q_free);
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if (count < QDIO_MAX_BUFFERS_PER_Q) {
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idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
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count = QDIO_MAX_BUFFERS_PER_Q - count;
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zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
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}
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qdio->req_q_idx = 0;
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atomic_set(&qdio->req_q_free, 0);
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}
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/**
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* zfcp_qdio_open - prepare and initialize response queue
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* @qdio: pointer to struct zfcp_qdio
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* Returns: 0 on success, otherwise -EIO
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*/
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int zfcp_qdio_open(struct zfcp_qdio *qdio)
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{
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struct qdio_buffer_element *sbale;
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struct qdio_initialize init_data;
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struct zfcp_adapter *adapter = qdio->adapter;
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struct ccw_device *cdev = adapter->ccw_device;
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int cc;
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if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
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return -EIO;
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zfcp_qdio_setup_init_data(&init_data, qdio);
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if (qdio_establish(&init_data))
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goto failed_establish;
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if (qdio_activate(cdev))
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goto failed_qdio;
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for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
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sbale = &(qdio->res_q[cc]->element[0]);
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sbale->length = 0;
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sbale->flags = SBAL_FLAGS_LAST_ENTRY;
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sbale->addr = NULL;
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}
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if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
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goto failed_qdio;
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/* set index of first avalable SBALS / number of available SBALS */
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qdio->req_q_idx = 0;
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atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
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return 0;
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failed_qdio:
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qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
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failed_establish:
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dev_err(&cdev->dev,
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"Setting up the QDIO connection to the FCP adapter failed\n");
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return -EIO;
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}
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void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
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{
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int p;
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if (!qdio)
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return;
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if (qdio->adapter->ccw_device)
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qdio_free(qdio->adapter->ccw_device);
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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) qdio->req_q[p]);
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free_page((unsigned long) qdio->res_q[p]);
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}
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kfree(qdio);
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}
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int zfcp_qdio_setup(struct zfcp_adapter *adapter)
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{
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struct zfcp_qdio *qdio;
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qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL);
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if (!qdio)
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return -ENOMEM;
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qdio->adapter = adapter;
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if (zfcp_qdio_allocate(qdio)) {
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zfcp_qdio_destroy(qdio);
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return -ENOMEM;
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}
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spin_lock_init(&qdio->req_q_lock);
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spin_lock_init(&qdio->stat_lock);
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adapter->qdio = qdio;
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return 0;
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}
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