Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 2 | * zfcp device driver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 4 | * Setup and helper functions to access QDIO. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 6 | * Copyright IBM Corporation 2002, 2009 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
Christof Schmitt | ecf39d4 | 2008-12-25 13:39:53 +0100 | [diff] [blame] | 9 | #define KMSG_COMPONENT "zfcp" |
| 10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include "zfcp_ext.h" |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 13 | #include "zfcp_qdio.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
Christof Schmitt | 5d4e226 | 2008-07-02 10:56:34 +0200 | [diff] [blame] | 15 | #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 17 | static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal) |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame] | 18 | { |
| 19 | int pos; |
| 20 | |
| 21 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) { |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 22 | sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL); |
| 23 | if (!sbal[pos]) |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame] | 24 | return -ENOMEM; |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame] | 25 | } |
| 26 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++) |
| 27 | if (pos % QBUFF_PER_PAGE) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 28 | sbal[pos] = sbal[pos - 1] + 1; |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame] | 29 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | } |
| 31 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 32 | static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 33 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 34 | struct zfcp_adapter *adapter = qdio->adapter; |
| 35 | |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 36 | dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n"); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 37 | |
| 38 | zfcp_erp_adapter_reopen(adapter, |
| 39 | ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | |
| 40 | ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL); |
| 41 | } |
| 42 | |
Christof Schmitt | 5d4e226 | 2008-07-02 10:56:34 +0200 | [diff] [blame] | 43 | static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt) |
| 44 | { |
| 45 | int i, sbal_idx; |
| 46 | |
| 47 | for (i = first; i < first + cnt; i++) { |
| 48 | sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q; |
| 49 | memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer)); |
| 50 | } |
| 51 | } |
| 52 | |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 53 | /* this needs to be called prior to updating the queue fill level */ |
Heiko Carstens | 41e05a1 | 2009-08-18 15:43:32 +0200 | [diff] [blame] | 54 | static inline void zfcp_qdio_account(struct zfcp_qdio *qdio) |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 55 | { |
Heiko Carstens | 41e05a1 | 2009-08-18 15:43:32 +0200 | [diff] [blame] | 56 | unsigned long long now, span; |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 57 | int free, used; |
| 58 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 59 | spin_lock(&qdio->stat_lock); |
Heiko Carstens | 41e05a1 | 2009-08-18 15:43:32 +0200 | [diff] [blame] | 60 | now = get_clock_monotonic(); |
| 61 | span = (now - qdio->req_q_time) >> 12; |
| 62 | free = atomic_read(&qdio->req_q.count); |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 63 | used = QDIO_MAX_BUFFERS_PER_Q - free; |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 64 | qdio->req_q_util += used * span; |
| 65 | qdio->req_q_time = now; |
| 66 | spin_unlock(&qdio->stat_lock); |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 67 | } |
| 68 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 69 | static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err, |
| 70 | int queue_no, int first, int count, |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 71 | unsigned long parm) |
| 72 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 73 | struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm; |
| 74 | struct zfcp_qdio_queue *queue = &qdio->req_q; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 75 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 76 | if (unlikely(qdio_err)) { |
Swen Schillig | 5771710 | 2009-08-18 15:43:21 +0200 | [diff] [blame] | 77 | zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, first, |
| 78 | count); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 79 | zfcp_qdio_handler_error(qdio, "qdireq1"); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 80 | return; |
| 81 | } |
| 82 | |
| 83 | /* cleanup all SBALs being program-owned now */ |
| 84 | zfcp_qdio_zero_sbals(queue->sbal, first, count); |
| 85 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 86 | zfcp_qdio_account(qdio); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 87 | atomic_add(count, &queue->count); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 88 | wake_up(&qdio->req_q_wq); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 89 | } |
| 90 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 91 | static void zfcp_qdio_resp_put_back(struct zfcp_qdio *qdio, int processed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 93 | struct zfcp_qdio_queue *queue = &qdio->resp_q; |
| 94 | struct ccw_device *cdev = qdio->adapter->ccw_device; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 95 | u8 count, start = queue->first; |
| 96 | unsigned int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 98 | count = atomic_read(&queue->count) + processed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 100 | retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 102 | if (unlikely(retval)) { |
| 103 | atomic_set(&queue->count, count); |
Christof Schmitt | 452b505 | 2010-02-17 11:18:51 +0100 | [diff] [blame] | 104 | zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdrpb_1", NULL); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 105 | } else { |
| 106 | queue->first += count; |
| 107 | queue->first %= QDIO_MAX_BUFFERS_PER_Q; |
| 108 | atomic_set(&queue->count, 0); |
| 109 | } |
| 110 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 112 | static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err, |
| 113 | int queue_no, int first, int count, |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 114 | unsigned long parm) |
| 115 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 116 | struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm; |
Swen Schillig | bd63eaf | 2009-08-18 15:43:13 +0200 | [diff] [blame] | 117 | int sbal_idx, sbal_no; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 118 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 119 | if (unlikely(qdio_err)) { |
Swen Schillig | 5771710 | 2009-08-18 15:43:21 +0200 | [diff] [blame] | 120 | zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, first, |
| 121 | count); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 122 | zfcp_qdio_handler_error(qdio, "qdires1"); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 123 | return; |
| 124 | } |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | /* |
| 127 | * go through all SBALs from input queue currently |
| 128 | * returned by QDIO layer |
| 129 | */ |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 130 | for (sbal_no = 0; sbal_no < count; sbal_no++) { |
| 131 | sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | /* go through all SBALEs of SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 133 | zfcp_fsf_reqid_check(qdio, sbal_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | /* |
| 137 | * put range of SBALs back to response queue |
| 138 | * (including SBALs which have already been free before) |
| 139 | */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 140 | zfcp_qdio_resp_put_back(qdio, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 143 | static void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio, |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 144 | struct zfcp_qdio_req *q_req, int max_sbals) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 146 | int count = atomic_read(&qdio->req_q.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | count = min(count, max_sbals); |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 148 | q_req->sbal_limit = (q_req->sbal_first + count - 1) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 149 | % QDIO_MAX_BUFFERS_PER_Q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 152 | static struct qdio_buffer_element * |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 153 | zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 154 | unsigned long sbtype) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 156 | struct qdio_buffer_element *sbale; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | /* set last entry flag in current SBALE of current SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 159 | sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | sbale->flags |= SBAL_FLAGS_LAST_ENTRY; |
| 161 | |
| 162 | /* don't exceed last allowed SBAL */ |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 163 | if (q_req->sbal_last == q_req->sbal_limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | return NULL; |
| 165 | |
| 166 | /* set chaining flag in first SBALE of current SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 167 | sbale = zfcp_qdio_sbale_req(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | sbale->flags |= SBAL_FLAGS0_MORE_SBALS; |
| 169 | |
| 170 | /* calculate index of next SBAL */ |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 171 | q_req->sbal_last++; |
| 172 | q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | /* keep this requests number of SBALs up-to-date */ |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 175 | q_req->sbal_number++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | /* start at first SBALE of new SBAL */ |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 178 | q_req->sbale_curr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | /* set storage-block type for new SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 181 | sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | sbale->flags |= sbtype; |
| 183 | |
| 184 | return sbale; |
| 185 | } |
| 186 | |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 187 | static struct qdio_buffer_element * |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 188 | zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 189 | unsigned int sbtype) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | { |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 191 | if (q_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL) |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 192 | return zfcp_qdio_sbal_chain(qdio, q_req, sbtype); |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 193 | q_req->sbale_curr++; |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 194 | return zfcp_qdio_sbale_curr(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 197 | static void zfcp_qdio_undo_sbals(struct zfcp_qdio *qdio, |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 198 | struct zfcp_qdio_req *q_req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 200 | struct qdio_buffer **sbal = qdio->req_q.sbal; |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 201 | int first = q_req->sbal_first; |
| 202 | int last = q_req->sbal_last; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 203 | int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) % |
| 204 | QDIO_MAX_BUFFERS_PER_Q + 1; |
| 205 | zfcp_qdio_zero_sbals(sbal, first, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | } |
| 207 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 208 | static int zfcp_qdio_fill_sbals(struct zfcp_qdio *qdio, |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 209 | struct zfcp_qdio_req *q_req, |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 210 | unsigned int sbtype, void *start_addr, |
| 211 | unsigned int total_length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | { |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 213 | struct qdio_buffer_element *sbale; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | unsigned long remaining, length; |
| 215 | void *addr; |
| 216 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 217 | /* split segment up */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | for (addr = start_addr, remaining = total_length; remaining > 0; |
| 219 | addr += length, remaining -= length) { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 220 | sbale = zfcp_qdio_sbale_next(qdio, q_req, sbtype); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 221 | if (!sbale) { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 222 | atomic_inc(&qdio->req_q_full); |
| 223 | zfcp_qdio_undo_sbals(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | return -EINVAL; |
| 225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 227 | /* new piece must not exceed next page boundary */ |
| 228 | length = min(remaining, |
| 229 | (PAGE_SIZE - ((unsigned long)addr & |
| 230 | (PAGE_SIZE - 1)))); |
| 231 | sbale->addr = addr; |
| 232 | sbale->length = length; |
| 233 | } |
| 234 | return 0; |
| 235 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
| 237 | /** |
| 238 | * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list |
| 239 | * @fsf_req: request to be processed |
| 240 | * @sbtype: SBALE flags |
| 241 | * @sg: scatter-gather list |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | * @max_sbals: upper bound for number of SBALs to be used |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 243 | * Returns: number of bytes, or error (negativ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | */ |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 245 | int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 246 | unsigned long sbtype, struct scatterlist *sg, |
| 247 | int max_sbals) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 249 | struct qdio_buffer_element *sbale; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 250 | int retval, bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
| 252 | /* figure out last allowed SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 253 | zfcp_qdio_sbal_limit(qdio, q_req, max_sbals); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 255 | /* set storage-block type for this request */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 256 | sbale = zfcp_qdio_sbale_req(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | sbale->flags |= sbtype; |
| 258 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 259 | for (; sg; sg = sg_next(sg)) { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 260 | retval = zfcp_qdio_fill_sbals(qdio, q_req, sbtype, |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 261 | sg_virt(sg), sg->length); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 262 | if (retval < 0) |
| 263 | return retval; |
| 264 | bytes += sg->length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | /* assume that no other SBALEs are to follow in the same SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 268 | sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | sbale->flags |= SBAL_FLAGS_LAST_ENTRY; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | return bytes; |
| 272 | } |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | /** |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 275 | * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 276 | * @qdio: pointer to struct zfcp_qdio |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 277 | * @q_req: pointer to struct zfcp_qdio_req |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 278 | * Returns: 0 on success, error otherwise |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | */ |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 280 | int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 282 | struct zfcp_qdio_queue *req_q = &qdio->req_q; |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 283 | int first = q_req->sbal_first; |
| 284 | int count = q_req->sbal_number; |
Christof Schmitt | 21ddaa5 | 2009-03-02 13:09:05 +0100 | [diff] [blame] | 285 | int retval; |
| 286 | unsigned int qdio_flags = QDIO_FLAG_SYNC_OUTPUT; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 287 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 288 | zfcp_qdio_account(qdio); |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 289 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 290 | retval = do_QDIO(qdio->adapter->ccw_device, qdio_flags, 0, first, |
| 291 | count); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 292 | if (unlikely(retval)) { |
| 293 | zfcp_qdio_zero_sbals(req_q->sbal, first, count); |
| 294 | return retval; |
| 295 | } |
| 296 | |
| 297 | /* account for transferred buffers */ |
| 298 | atomic_sub(count, &req_q->count); |
| 299 | req_q->first += count; |
| 300 | req_q->first %= QDIO_MAX_BUFFERS_PER_Q; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 301 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | } |
| 303 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 304 | |
| 305 | static void zfcp_qdio_setup_init_data(struct qdio_initialize *id, |
| 306 | struct zfcp_qdio *qdio) |
| 307 | { |
| 308 | |
| 309 | id->cdev = qdio->adapter->ccw_device; |
| 310 | id->q_format = QDIO_ZFCP_QFMT; |
| 311 | memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8); |
| 312 | ASCEBC(id->adapter_name, 8); |
| 313 | id->qib_param_field_format = 0; |
| 314 | id->qib_param_field = NULL; |
| 315 | id->input_slib_elements = NULL; |
| 316 | id->output_slib_elements = NULL; |
| 317 | id->no_input_qs = 1; |
| 318 | id->no_output_qs = 1; |
| 319 | id->input_handler = zfcp_qdio_int_resp; |
| 320 | id->output_handler = zfcp_qdio_int_req; |
| 321 | id->int_parm = (unsigned long) qdio; |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 322 | id->input_sbal_addr_array = (void **) (qdio->resp_q.sbal); |
| 323 | id->output_sbal_addr_array = (void **) (qdio->req_q.sbal); |
| 324 | |
| 325 | } |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 326 | /** |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 327 | * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data |
| 328 | * @adapter: pointer to struct zfcp_adapter |
| 329 | * Returns: -ENOMEM on memory allocation error or return value from |
| 330 | * qdio_allocate |
| 331 | */ |
Swen Schillig | d5a282a | 2009-08-18 15:43:22 +0200 | [diff] [blame] | 332 | static int zfcp_qdio_allocate(struct zfcp_qdio *qdio) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 333 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 334 | struct qdio_initialize init_data; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 335 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 336 | if (zfcp_qdio_buffers_enqueue(qdio->req_q.sbal) || |
| 337 | zfcp_qdio_buffers_enqueue(qdio->resp_q.sbal)) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 338 | return -ENOMEM; |
| 339 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 340 | zfcp_qdio_setup_init_data(&init_data, qdio); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 341 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 342 | return qdio_allocate(&init_data); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | /** |
| 346 | * zfcp_close_qdio - close qdio queues for an adapter |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 347 | * @qdio: pointer to structure zfcp_qdio |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 348 | */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 349 | void zfcp_qdio_close(struct zfcp_qdio *qdio) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 350 | { |
| 351 | struct zfcp_qdio_queue *req_q; |
| 352 | int first, count; |
| 353 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 354 | if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 355 | return; |
| 356 | |
| 357 | /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 358 | req_q = &qdio->req_q; |
| 359 | spin_lock_bh(&qdio->req_q_lock); |
| 360 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status); |
| 361 | spin_unlock_bh(&qdio->req_q_lock); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 362 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 363 | qdio_shutdown(qdio->adapter->ccw_device, |
| 364 | QDIO_FLAG_CLEANUP_USING_CLEAR); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 365 | |
| 366 | /* cleanup used outbound sbals */ |
| 367 | count = atomic_read(&req_q->count); |
| 368 | if (count < QDIO_MAX_BUFFERS_PER_Q) { |
| 369 | first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q; |
| 370 | count = QDIO_MAX_BUFFERS_PER_Q - count; |
| 371 | zfcp_qdio_zero_sbals(req_q->sbal, first, count); |
| 372 | } |
| 373 | req_q->first = 0; |
| 374 | atomic_set(&req_q->count, 0); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 375 | qdio->resp_q.first = 0; |
| 376 | atomic_set(&qdio->resp_q.count, 0); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 377 | } |
| 378 | |
| 379 | /** |
| 380 | * zfcp_qdio_open - prepare and initialize response queue |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 381 | * @qdio: pointer to struct zfcp_qdio |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 382 | * Returns: 0 on success, otherwise -EIO |
| 383 | */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 384 | int zfcp_qdio_open(struct zfcp_qdio *qdio) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 385 | { |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 386 | struct qdio_buffer_element *sbale; |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 387 | struct qdio_initialize init_data; |
| 388 | struct ccw_device *cdev = qdio->adapter->ccw_device; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 389 | int cc; |
| 390 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 391 | if (atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 392 | return -EIO; |
| 393 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 394 | zfcp_qdio_setup_init_data(&init_data, qdio); |
| 395 | |
| 396 | if (qdio_establish(&init_data)) |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 397 | goto failed_establish; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 398 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 399 | if (qdio_activate(cdev)) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 400 | goto failed_qdio; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 401 | |
| 402 | for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 403 | sbale = &(qdio->resp_q.sbal[cc]->element[0]); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 404 | sbale->length = 0; |
| 405 | sbale->flags = SBAL_FLAGS_LAST_ENTRY; |
| 406 | sbale->addr = NULL; |
| 407 | } |
| 408 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 409 | if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 410 | QDIO_MAX_BUFFERS_PER_Q)) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 411 | goto failed_qdio; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 412 | |
| 413 | /* set index of first avalable SBALS / number of available SBALS */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 414 | qdio->req_q.first = 0; |
| 415 | atomic_set(&qdio->req_q.count, QDIO_MAX_BUFFERS_PER_Q); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 416 | |
| 417 | return 0; |
| 418 | |
| 419 | failed_qdio: |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 420 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 421 | failed_establish: |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 422 | dev_err(&cdev->dev, |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 423 | "Setting up the QDIO connection to the FCP adapter failed\n"); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 424 | return -EIO; |
| 425 | } |
Swen Schillig | d5a282a | 2009-08-18 15:43:22 +0200 | [diff] [blame] | 426 | |
| 427 | void zfcp_qdio_destroy(struct zfcp_qdio *qdio) |
| 428 | { |
| 429 | struct qdio_buffer **sbal_req, **sbal_resp; |
| 430 | int p; |
| 431 | |
| 432 | if (!qdio) |
| 433 | return; |
| 434 | |
| 435 | if (qdio->adapter->ccw_device) |
| 436 | qdio_free(qdio->adapter->ccw_device); |
| 437 | |
| 438 | sbal_req = qdio->req_q.sbal; |
| 439 | sbal_resp = qdio->resp_q.sbal; |
| 440 | |
| 441 | for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) { |
| 442 | free_page((unsigned long) sbal_req[p]); |
| 443 | free_page((unsigned long) sbal_resp[p]); |
| 444 | } |
| 445 | |
| 446 | kfree(qdio); |
| 447 | } |
| 448 | |
| 449 | int zfcp_qdio_setup(struct zfcp_adapter *adapter) |
| 450 | { |
| 451 | struct zfcp_qdio *qdio; |
| 452 | |
| 453 | qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL); |
| 454 | if (!qdio) |
| 455 | return -ENOMEM; |
| 456 | |
| 457 | qdio->adapter = adapter; |
| 458 | |
| 459 | if (zfcp_qdio_allocate(qdio)) { |
| 460 | zfcp_qdio_destroy(qdio); |
| 461 | return -ENOMEM; |
| 462 | } |
| 463 | |
| 464 | spin_lock_init(&qdio->req_q_lock); |
| 465 | spin_lock_init(&qdio->stat_lock); |
| 466 | |
| 467 | adapter->qdio = qdio; |
| 468 | return 0; |
| 469 | } |
| 470 | |