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 | * |
Christof Schmitt | 1674b40 | 2010-04-30 18:09:34 +0200 | [diff] [blame] | 6 | * Copyright IBM Corporation 2002, 2010 |
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 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include "zfcp_ext.h" |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 14 | #include "zfcp_qdio.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
Christof Schmitt | 5d4e226 | 2008-07-02 10:56:34 +0200 | [diff] [blame] | 16 | #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 18 | static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal) |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame] | 19 | { |
| 20 | int pos; |
| 21 | |
| 22 | 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] | 23 | sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL); |
| 24 | if (!sbal[pos]) |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame] | 25 | return -ENOMEM; |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame] | 26 | } |
| 27 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++) |
| 28 | if (pos % QBUFF_PER_PAGE) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 29 | sbal[pos] = sbal[pos - 1] + 1; |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame] | 30 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | } |
| 32 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 33 | static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 34 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 35 | struct zfcp_adapter *adapter = qdio->adapter; |
| 36 | |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 37 | dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n"); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 38 | |
| 39 | zfcp_erp_adapter_reopen(adapter, |
| 40 | ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | |
| 41 | ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL); |
| 42 | } |
| 43 | |
Christof Schmitt | 5d4e226 | 2008-07-02 10:56:34 +0200 | [diff] [blame] | 44 | static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt) |
| 45 | { |
| 46 | int i, sbal_idx; |
| 47 | |
| 48 | for (i = first; i < first + cnt; i++) { |
| 49 | sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q; |
| 50 | memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer)); |
| 51 | } |
| 52 | } |
| 53 | |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 54 | /* this needs to be called prior to updating the queue fill level */ |
Heiko Carstens | 41e05a1 | 2009-08-18 15:43:32 +0200 | [diff] [blame] | 55 | static inline void zfcp_qdio_account(struct zfcp_qdio *qdio) |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 56 | { |
Heiko Carstens | 41e05a1 | 2009-08-18 15:43:32 +0200 | [diff] [blame] | 57 | unsigned long long now, span; |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 58 | int used; |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 59 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 60 | spin_lock(&qdio->stat_lock); |
Heiko Carstens | 41e05a1 | 2009-08-18 15:43:32 +0200 | [diff] [blame] | 61 | now = get_clock_monotonic(); |
| 62 | span = (now - qdio->req_q_time) >> 12; |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 63 | used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_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, |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 70 | int queue_no, int idx, 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; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 74 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 75 | if (unlikely(qdio_err)) { |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 76 | zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 77 | zfcp_qdio_handler_error(qdio, "qdireq1"); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 78 | return; |
| 79 | } |
| 80 | |
| 81 | /* cleanup all SBALs being program-owned now */ |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 82 | zfcp_qdio_zero_sbals(qdio->req_q, idx, count); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 83 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 84 | zfcp_qdio_account(qdio); |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 85 | atomic_add(count, &qdio->req_q_free); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 86 | wake_up(&qdio->req_q_wq); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 87 | } |
| 88 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 89 | static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err, |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 90 | int queue_no, int idx, int count, |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 91 | unsigned long parm) |
| 92 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 93 | struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm; |
Swen Schillig | bd63eaf | 2009-08-18 15:43:13 +0200 | [diff] [blame] | 94 | int sbal_idx, sbal_no; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 95 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 96 | if (unlikely(qdio_err)) { |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 97 | zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 98 | zfcp_qdio_handler_error(qdio, "qdires1"); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 99 | return; |
| 100 | } |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | /* |
| 103 | * go through all SBALs from input queue currently |
| 104 | * returned by QDIO layer |
| 105 | */ |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 106 | for (sbal_no = 0; sbal_no < count; sbal_no++) { |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 107 | sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | /* go through all SBALEs of SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 109 | zfcp_fsf_reqid_check(qdio, sbal_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | /* |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 113 | * put SBALs back to response queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | */ |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 115 | if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count)) |
| 116 | zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | } |
| 118 | |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 119 | static struct qdio_buffer_element * |
Christof Schmitt | 1674b40 | 2010-04-30 18:09:34 +0200 | [diff] [blame] | 120 | zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 122 | struct qdio_buffer_element *sbale; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | /* set last entry flag in current SBALE of current SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 125 | sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | sbale->flags |= SBAL_FLAGS_LAST_ENTRY; |
| 127 | |
| 128 | /* don't exceed last allowed SBAL */ |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 129 | if (q_req->sbal_last == q_req->sbal_limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | return NULL; |
| 131 | |
| 132 | /* set chaining flag in first SBALE of current SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 133 | sbale = zfcp_qdio_sbale_req(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | sbale->flags |= SBAL_FLAGS0_MORE_SBALS; |
| 135 | |
| 136 | /* calculate index of next SBAL */ |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 137 | q_req->sbal_last++; |
| 138 | q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
| 140 | /* keep this requests number of SBALs up-to-date */ |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 141 | q_req->sbal_number++; |
Swen Schillig | 01b0475 | 2010-07-16 15:37:37 +0200 | [diff] [blame] | 142 | BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | /* start at first SBALE of new SBAL */ |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 145 | q_req->sbale_curr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | /* set storage-block type for new SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 148 | sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
Christof Schmitt | 1674b40 | 2010-04-30 18:09:34 +0200 | [diff] [blame] | 149 | sbale->flags |= q_req->sbtype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | return sbale; |
| 152 | } |
| 153 | |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 154 | static struct qdio_buffer_element * |
Christof Schmitt | 1674b40 | 2010-04-30 18:09:34 +0200 | [diff] [blame] | 155 | zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
Christof Schmitt | 1674b40 | 2010-04-30 18:09:34 +0200 | [diff] [blame] | 157 | if (q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL) |
| 158 | return zfcp_qdio_sbal_chain(qdio, q_req); |
Swen Schillig | 42428f7 | 2009-08-18 15:43:18 +0200 | [diff] [blame] | 159 | q_req->sbale_curr++; |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 160 | return zfcp_qdio_sbale_curr(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } |
| 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | /** |
| 164 | * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list |
Christof Schmitt | 1674b40 | 2010-04-30 18:09:34 +0200 | [diff] [blame] | 165 | * @qdio: pointer to struct zfcp_qdio |
| 166 | * @q_req: pointer to struct zfcp_qdio_req |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | * @sg: scatter-gather list |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | * @max_sbals: upper bound for number of SBALs to be used |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 169 | * Returns: number of bytes, or error (negativ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | */ |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 171 | int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, |
Swen Schillig | 01b0475 | 2010-07-16 15:37:37 +0200 | [diff] [blame] | 172 | struct scatterlist *sg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 174 | struct qdio_buffer_element *sbale; |
Christof Schmitt | 6832298 | 2010-04-30 18:09:33 +0200 | [diff] [blame] | 175 | int bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 177 | /* set storage-block type for this request */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 178 | sbale = zfcp_qdio_sbale_req(qdio, q_req); |
Christof Schmitt | 1674b40 | 2010-04-30 18:09:34 +0200 | [diff] [blame] | 179 | sbale->flags |= q_req->sbtype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 181 | for (; sg; sg = sg_next(sg)) { |
Christof Schmitt | 1674b40 | 2010-04-30 18:09:34 +0200 | [diff] [blame] | 182 | sbale = zfcp_qdio_sbale_next(qdio, q_req); |
Christof Schmitt | 6832298 | 2010-04-30 18:09:33 +0200 | [diff] [blame] | 183 | if (!sbale) { |
| 184 | atomic_inc(&qdio->req_q_full); |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 185 | zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first, |
| 186 | q_req->sbal_number); |
Christof Schmitt | 6832298 | 2010-04-30 18:09:33 +0200 | [diff] [blame] | 187 | return -EINVAL; |
| 188 | } |
| 189 | |
| 190 | sbale->addr = sg_virt(sg); |
| 191 | sbale->length = sg->length; |
| 192 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 193 | bytes += sg->length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* assume that no other SBALEs are to follow in the same SBAL */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 197 | sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | sbale->flags |= SBAL_FLAGS_LAST_ENTRY; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | return bytes; |
| 201 | } |
| 202 | |
Christof Schmitt | 6b9e152 | 2010-04-30 18:09:35 +0200 | [diff] [blame] | 203 | static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio) |
| 204 | { |
Christof Schmitt | 6b9e152 | 2010-04-30 18:09:35 +0200 | [diff] [blame] | 205 | spin_lock_bh(&qdio->req_q_lock); |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 206 | if (atomic_read(&qdio->req_q_free) || |
Christof Schmitt | c2af754 | 2010-06-21 10:11:32 +0200 | [diff] [blame] | 207 | !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) |
Christof Schmitt | 6b9e152 | 2010-04-30 18:09:35 +0200 | [diff] [blame] | 208 | return 1; |
| 209 | spin_unlock_bh(&qdio->req_q_lock); |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary |
| 215 | * @qdio: pointer to struct zfcp_qdio |
| 216 | * |
| 217 | * The req_q_lock must be held by the caller of this function, and |
| 218 | * this function may only be called from process context; it will |
| 219 | * sleep when waiting for a free sbal. |
| 220 | * |
| 221 | * Returns: 0 on success, -EIO if there is no free sbal after waiting. |
| 222 | */ |
| 223 | int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio) |
| 224 | { |
| 225 | long ret; |
| 226 | |
| 227 | spin_unlock_bh(&qdio->req_q_lock); |
| 228 | ret = wait_event_interruptible_timeout(qdio->req_q_wq, |
| 229 | zfcp_qdio_sbal_check(qdio), 5 * HZ); |
Christof Schmitt | c2af754 | 2010-06-21 10:11:32 +0200 | [diff] [blame] | 230 | |
| 231 | if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) |
| 232 | return -EIO; |
| 233 | |
Christof Schmitt | 6b9e152 | 2010-04-30 18:09:35 +0200 | [diff] [blame] | 234 | if (ret > 0) |
| 235 | return 0; |
Christof Schmitt | c2af754 | 2010-06-21 10:11:32 +0200 | [diff] [blame] | 236 | |
Christof Schmitt | 6b9e152 | 2010-04-30 18:09:35 +0200 | [diff] [blame] | 237 | if (!ret) { |
| 238 | atomic_inc(&qdio->req_q_full); |
| 239 | /* assume hanging outbound queue, try queue recovery */ |
| 240 | zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1", NULL); |
| 241 | } |
| 242 | |
| 243 | spin_lock_bh(&qdio->req_q_lock); |
| 244 | return -EIO; |
| 245 | } |
| 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | /** |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 248 | * 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] | 249 | * @qdio: pointer to struct zfcp_qdio |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 250 | * @q_req: pointer to struct zfcp_qdio_req |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 251 | * Returns: 0 on success, error otherwise |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | */ |
Christof Schmitt | 34c2b71 | 2010-02-17 11:18:59 +0100 | [diff] [blame] | 253 | 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] | 254 | { |
Christof Schmitt | 21ddaa5 | 2009-03-02 13:09:05 +0100 | [diff] [blame] | 255 | int retval; |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 256 | u8 sbal_number = q_req->sbal_number; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 257 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 258 | zfcp_qdio_account(qdio); |
Martin Peschke | 94506fd | 2009-03-02 13:08:56 +0100 | [diff] [blame] | 259 | |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 260 | retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, |
| 261 | q_req->sbal_first, sbal_number); |
| 262 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 263 | if (unlikely(retval)) { |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 264 | zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first, |
| 265 | sbal_number); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 266 | return retval; |
| 267 | } |
| 268 | |
| 269 | /* account for transferred buffers */ |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 270 | atomic_sub(sbal_number, &qdio->req_q_free); |
| 271 | qdio->req_q_idx += sbal_number; |
| 272 | qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q; |
| 273 | |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 274 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | } |
| 276 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 277 | |
| 278 | static void zfcp_qdio_setup_init_data(struct qdio_initialize *id, |
| 279 | struct zfcp_qdio *qdio) |
| 280 | { |
| 281 | |
| 282 | id->cdev = qdio->adapter->ccw_device; |
| 283 | id->q_format = QDIO_ZFCP_QFMT; |
| 284 | memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8); |
| 285 | ASCEBC(id->adapter_name, 8); |
| 286 | id->qib_param_field_format = 0; |
| 287 | id->qib_param_field = NULL; |
| 288 | id->input_slib_elements = NULL; |
| 289 | id->output_slib_elements = NULL; |
| 290 | id->no_input_qs = 1; |
| 291 | id->no_output_qs = 1; |
| 292 | id->input_handler = zfcp_qdio_int_resp; |
| 293 | id->output_handler = zfcp_qdio_int_req; |
| 294 | id->int_parm = (unsigned long) qdio; |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 295 | id->input_sbal_addr_array = (void **) (qdio->res_q); |
| 296 | id->output_sbal_addr_array = (void **) (qdio->req_q); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 297 | |
| 298 | } |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 299 | /** |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 300 | * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data |
| 301 | * @adapter: pointer to struct zfcp_adapter |
| 302 | * Returns: -ENOMEM on memory allocation error or return value from |
| 303 | * qdio_allocate |
| 304 | */ |
Swen Schillig | d5a282a | 2009-08-18 15:43:22 +0200 | [diff] [blame] | 305 | static int zfcp_qdio_allocate(struct zfcp_qdio *qdio) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 306 | { |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 307 | struct qdio_initialize init_data; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 308 | |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 309 | if (zfcp_qdio_buffers_enqueue(qdio->req_q) || |
| 310 | zfcp_qdio_buffers_enqueue(qdio->res_q)) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 311 | return -ENOMEM; |
| 312 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 313 | zfcp_qdio_setup_init_data(&init_data, qdio); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 314 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 315 | return qdio_allocate(&init_data); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | /** |
| 319 | * zfcp_close_qdio - close qdio queues for an adapter |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 320 | * @qdio: pointer to structure zfcp_qdio |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 321 | */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 322 | void zfcp_qdio_close(struct zfcp_qdio *qdio) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 323 | { |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 324 | struct zfcp_adapter *adapter = qdio->adapter; |
| 325 | int idx, count; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 326 | |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 327 | if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 328 | return; |
| 329 | |
| 330 | /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 331 | spin_lock_bh(&qdio->req_q_lock); |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 332 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status); |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 333 | spin_unlock_bh(&qdio->req_q_lock); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 334 | |
Christof Schmitt | c2af754 | 2010-06-21 10:11:32 +0200 | [diff] [blame] | 335 | wake_up(&qdio->req_q_wq); |
| 336 | |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 337 | qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 338 | |
| 339 | /* cleanup used outbound sbals */ |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 340 | count = atomic_read(&qdio->req_q_free); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 341 | if (count < QDIO_MAX_BUFFERS_PER_Q) { |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 342 | idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 343 | count = QDIO_MAX_BUFFERS_PER_Q - count; |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 344 | zfcp_qdio_zero_sbals(qdio->req_q, idx, count); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 345 | } |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 346 | qdio->req_q_idx = 0; |
| 347 | atomic_set(&qdio->req_q_free, 0); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | /** |
| 351 | * zfcp_qdio_open - prepare and initialize response queue |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 352 | * @qdio: pointer to struct zfcp_qdio |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 353 | * Returns: 0 on success, otherwise -EIO |
| 354 | */ |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 355 | int zfcp_qdio_open(struct zfcp_qdio *qdio) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 356 | { |
Swen Schillig | 44cc76f | 2008-10-01 12:42:16 +0200 | [diff] [blame] | 357 | struct qdio_buffer_element *sbale; |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 358 | struct qdio_initialize init_data; |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 359 | struct zfcp_adapter *adapter = qdio->adapter; |
| 360 | struct ccw_device *cdev = adapter->ccw_device; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 361 | int cc; |
| 362 | |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 363 | if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 364 | return -EIO; |
| 365 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 366 | zfcp_qdio_setup_init_data(&init_data, qdio); |
| 367 | |
| 368 | if (qdio_establish(&init_data)) |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 369 | goto failed_establish; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 370 | |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 371 | if (qdio_activate(cdev)) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 372 | goto failed_qdio; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 373 | |
| 374 | for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) { |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 375 | sbale = &(qdio->res_q[cc]->element[0]); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 376 | sbale->length = 0; |
| 377 | sbale->flags = SBAL_FLAGS_LAST_ENTRY; |
| 378 | sbale->addr = NULL; |
| 379 | } |
| 380 | |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 381 | if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q)) |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 382 | goto failed_qdio; |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 383 | |
| 384 | /* set index of first avalable SBALS / number of available SBALS */ |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 385 | qdio->req_q_idx = 0; |
| 386 | atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 387 | |
| 388 | return 0; |
| 389 | |
| 390 | failed_qdio: |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 391 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 392 | failed_establish: |
Swen Schillig | 564e1c8 | 2009-08-18 15:43:19 +0200 | [diff] [blame] | 393 | dev_err(&cdev->dev, |
Christof Schmitt | ff3b24f | 2008-10-01 12:42:15 +0200 | [diff] [blame] | 394 | "Setting up the QDIO connection to the FCP adapter failed\n"); |
Swen Schillig | 00bab91 | 2008-06-10 18:20:57 +0200 | [diff] [blame] | 395 | return -EIO; |
| 396 | } |
Swen Schillig | d5a282a | 2009-08-18 15:43:22 +0200 | [diff] [blame] | 397 | |
| 398 | void zfcp_qdio_destroy(struct zfcp_qdio *qdio) |
| 399 | { |
Swen Schillig | d5a282a | 2009-08-18 15:43:22 +0200 | [diff] [blame] | 400 | int p; |
| 401 | |
| 402 | if (!qdio) |
| 403 | return; |
| 404 | |
| 405 | if (qdio->adapter->ccw_device) |
| 406 | qdio_free(qdio->adapter->ccw_device); |
| 407 | |
Swen Schillig | d5a282a | 2009-08-18 15:43:22 +0200 | [diff] [blame] | 408 | for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) { |
Swen Schillig | 706eca4 | 2010-07-16 15:37:38 +0200 | [diff] [blame^] | 409 | free_page((unsigned long) qdio->req_q[p]); |
| 410 | free_page((unsigned long) qdio->res_q[p]); |
Swen Schillig | d5a282a | 2009-08-18 15:43:22 +0200 | [diff] [blame] | 411 | } |
| 412 | |
| 413 | kfree(qdio); |
| 414 | } |
| 415 | |
| 416 | int zfcp_qdio_setup(struct zfcp_adapter *adapter) |
| 417 | { |
| 418 | struct zfcp_qdio *qdio; |
| 419 | |
| 420 | qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL); |
| 421 | if (!qdio) |
| 422 | return -ENOMEM; |
| 423 | |
| 424 | qdio->adapter = adapter; |
| 425 | |
| 426 | if (zfcp_qdio_allocate(qdio)) { |
| 427 | zfcp_qdio_destroy(qdio); |
| 428 | return -ENOMEM; |
| 429 | } |
| 430 | |
| 431 | spin_lock_init(&qdio->req_q_lock); |
| 432 | spin_lock_init(&qdio->stat_lock); |
| 433 | |
| 434 | adapter->qdio = qdio; |
| 435 | return 0; |
| 436 | } |
| 437 | |