Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Andreas Herrmann | 4a9d2d8 | 2006-05-22 18:14:08 +0200 | [diff] [blame] | 2 | * This file is part of the zfcp device driver for |
| 3 | * FCP adapters for IBM System z9 and zSeries. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Andreas Herrmann | 4a9d2d8 | 2006-05-22 18:14:08 +0200 | [diff] [blame] | 5 | * (C) Copyright IBM Corp. 2002, 2006 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2, or (at your option) |
| 10 | * any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | */ |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include "zfcp_ext.h" |
| 23 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 24 | static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_get |
| 26 | (struct zfcp_qdio_queue *, int, int); |
| 27 | static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_resp |
| 28 | (struct zfcp_fsf_req *, int, int); |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 29 | static volatile struct qdio_buffer_element *zfcp_qdio_sbal_chain |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | (struct zfcp_fsf_req *, unsigned long); |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 31 | static volatile struct qdio_buffer_element *zfcp_qdio_sbale_next |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | (struct zfcp_fsf_req *, unsigned long); |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 33 | static int zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *, int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | static inline int zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *); |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 35 | static void zfcp_qdio_sbale_fill |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | (struct zfcp_fsf_req *, unsigned long, void *, int); |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 37 | static int zfcp_qdio_sbals_from_segment |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | (struct zfcp_fsf_req *, unsigned long, void *, unsigned long); |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 39 | static int zfcp_qdio_sbals_from_buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | (struct zfcp_fsf_req *, unsigned long, void *, unsigned long, int); |
| 41 | |
| 42 | static qdio_handler_t zfcp_qdio_request_handler; |
| 43 | static qdio_handler_t zfcp_qdio_response_handler; |
| 44 | static int zfcp_qdio_handler_error_check(struct zfcp_adapter *, |
Maxim Shchetynin | 8a36e45 | 2005-09-13 21:50:38 +0200 | [diff] [blame] | 45 | unsigned int, unsigned int, unsigned int, int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | #define ZFCP_LOG_AREA ZFCP_LOG_AREA_QDIO |
| 48 | |
| 49 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | * Frees BUFFER memory for each of the pointers of the struct qdio_buffer array |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 51 | * in the adapter struct sbuf is the pointer array. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | * |
| 53 | * locks: must only be called with zfcp_data.config_sema taken |
| 54 | */ |
| 55 | static void |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 56 | zfcp_qdio_buffers_dequeue(struct qdio_buffer **sbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | { |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 58 | int pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 60 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) |
| 61 | free_page((unsigned long) sbuf[pos]); |
| 62 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 64 | /* |
| 65 | * Allocates BUFFER memory to each of the pointers of the qdio_buffer_t |
| 66 | * array in the adapter struct. |
| 67 | * Cur_buf is the pointer array |
| 68 | * |
| 69 | * returns: zero on success else -ENOMEM |
| 70 | * locks: must only be called with zfcp_data.config_sema taken |
| 71 | */ |
| 72 | static int |
| 73 | zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbuf) |
| 74 | { |
| 75 | int pos; |
| 76 | |
| 77 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) { |
| 78 | sbuf[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL); |
| 79 | if (!sbuf[pos]) { |
| 80 | zfcp_qdio_buffers_dequeue(sbuf); |
| 81 | return -ENOMEM; |
| 82 | } |
| 83 | } |
| 84 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++) |
| 85 | if (pos % QBUFF_PER_PAGE) |
| 86 | sbuf[pos] = sbuf[pos - 1] + 1; |
| 87 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | /* locks: must only be called with zfcp_data.config_sema taken */ |
| 91 | int |
| 92 | zfcp_qdio_allocate_queues(struct zfcp_adapter *adapter) |
| 93 | { |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 94 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 96 | ret = zfcp_qdio_buffers_enqueue(adapter->request_queue.buffer); |
| 97 | if (ret) |
| 98 | return ret; |
| 99 | return zfcp_qdio_buffers_enqueue(adapter->response_queue.buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | /* locks: must only be called with zfcp_data.config_sema taken */ |
| 103 | void |
| 104 | zfcp_qdio_free_queues(struct zfcp_adapter *adapter) |
| 105 | { |
| 106 | ZFCP_LOG_TRACE("freeing request_queue buffers\n"); |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 107 | zfcp_qdio_buffers_dequeue(adapter->request_queue.buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | ZFCP_LOG_TRACE("freeing response_queue buffers\n"); |
Swen Schillig | b4e4459 | 2007-07-18 10:55:13 +0200 | [diff] [blame^] | 110 | zfcp_qdio_buffers_dequeue(adapter->response_queue.buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | int |
| 114 | zfcp_qdio_allocate(struct zfcp_adapter *adapter) |
| 115 | { |
| 116 | struct qdio_initialize *init_data; |
| 117 | |
| 118 | init_data = &adapter->qdio_init_data; |
| 119 | |
| 120 | init_data->cdev = adapter->ccw_device; |
| 121 | init_data->q_format = QDIO_SCSI_QFMT; |
Andreas Herrmann | 06506d0 | 2006-05-22 18:18:19 +0200 | [diff] [blame] | 122 | memcpy(init_data->adapter_name, zfcp_get_busid_by_adapter(adapter), 8); |
| 123 | ASCEBC(init_data->adapter_name, 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | init_data->qib_param_field_format = 0; |
| 125 | init_data->qib_param_field = NULL; |
| 126 | init_data->input_slib_elements = NULL; |
| 127 | init_data->output_slib_elements = NULL; |
| 128 | init_data->min_input_threshold = ZFCP_MIN_INPUT_THRESHOLD; |
| 129 | init_data->max_input_threshold = ZFCP_MAX_INPUT_THRESHOLD; |
| 130 | init_data->min_output_threshold = ZFCP_MIN_OUTPUT_THRESHOLD; |
| 131 | init_data->max_output_threshold = ZFCP_MAX_OUTPUT_THRESHOLD; |
| 132 | init_data->no_input_qs = 1; |
| 133 | init_data->no_output_qs = 1; |
| 134 | init_data->input_handler = zfcp_qdio_response_handler; |
| 135 | init_data->output_handler = zfcp_qdio_request_handler; |
| 136 | init_data->int_parm = (unsigned long) adapter; |
| 137 | init_data->flags = QDIO_INBOUND_0COPY_SBALS | |
| 138 | QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS; |
| 139 | init_data->input_sbal_addr_array = |
| 140 | (void **) (adapter->response_queue.buffer); |
| 141 | init_data->output_sbal_addr_array = |
| 142 | (void **) (adapter->request_queue.buffer); |
| 143 | |
| 144 | return qdio_allocate(init_data); |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * function: zfcp_qdio_handler_error_check |
| 149 | * |
| 150 | * purpose: called by the response handler to determine error condition |
| 151 | * |
| 152 | * returns: error flag |
| 153 | * |
| 154 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 155 | static int |
Maxim Shchetynin | 8a36e45 | 2005-09-13 21:50:38 +0200 | [diff] [blame] | 156 | zfcp_qdio_handler_error_check(struct zfcp_adapter *adapter, unsigned int status, |
| 157 | unsigned int qdio_error, unsigned int siga_error, |
| 158 | int first_element, int elements_processed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | { |
| 160 | int retval = 0; |
| 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) { |
| 163 | retval = -EIO; |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | ZFCP_LOG_INFO("QDIO problem occurred (status=0x%x, " |
| 166 | "qdio_error=0x%x, siga_error=0x%x)\n", |
| 167 | status, qdio_error, siga_error); |
| 168 | |
Maxim Shchetynin | 8a36e45 | 2005-09-13 21:50:38 +0200 | [diff] [blame] | 169 | zfcp_hba_dbf_event_qdio(adapter, status, qdio_error, siga_error, |
| 170 | first_element, elements_processed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | /* |
Maxim Shchetynin | 8a36e45 | 2005-09-13 21:50:38 +0200 | [diff] [blame] | 172 | * Restarting IO on the failed adapter from scratch. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | * Since we have been using this adapter, it is save to assume |
| 174 | * that it is not failed but recoverable. The card seems to |
| 175 | * report link-up events by self-initiated queue shutdown. |
Michael Opdenacker | 59c5159 | 2007-05-09 08:57:56 +0200 | [diff] [blame] | 176 | * That is why we need to clear the link-down flag |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | * which is set again in case we have missed by a mile. |
| 178 | */ |
| 179 | zfcp_erp_adapter_reopen( |
| 180 | adapter, |
| 181 | ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | |
| 182 | ZFCP_STATUS_COMMON_ERP_FAILED); |
| 183 | } |
| 184 | return retval; |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * function: zfcp_qdio_request_handler |
| 189 | * |
| 190 | * purpose: is called by QDIO layer for completed SBALs in request queue |
| 191 | * |
| 192 | * returns: (void) |
| 193 | */ |
| 194 | static void |
| 195 | zfcp_qdio_request_handler(struct ccw_device *ccw_device, |
| 196 | unsigned int status, |
| 197 | unsigned int qdio_error, |
| 198 | unsigned int siga_error, |
| 199 | unsigned int queue_number, |
| 200 | int first_element, |
| 201 | int elements_processed, |
| 202 | unsigned long int_parm) |
| 203 | { |
| 204 | struct zfcp_adapter *adapter; |
| 205 | struct zfcp_qdio_queue *queue; |
| 206 | |
| 207 | adapter = (struct zfcp_adapter *) int_parm; |
| 208 | queue = &adapter->request_queue; |
| 209 | |
| 210 | ZFCP_LOG_DEBUG("adapter %s, first=%d, elements_processed=%d\n", |
| 211 | zfcp_get_busid_by_adapter(adapter), |
| 212 | first_element, elements_processed); |
| 213 | |
| 214 | if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error, |
Maxim Shchetynin | 8a36e45 | 2005-09-13 21:50:38 +0200 | [diff] [blame] | 215 | siga_error, first_element, |
| 216 | elements_processed))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | goto out; |
| 218 | /* |
| 219 | * we stored address of struct zfcp_adapter data structure |
| 220 | * associated with irq in int_parm |
| 221 | */ |
| 222 | |
| 223 | /* cleanup all SBALs being program-owned now */ |
| 224 | zfcp_qdio_zero_sbals(queue->buffer, first_element, elements_processed); |
| 225 | |
| 226 | /* increase free space in outbound queue */ |
| 227 | atomic_add(elements_processed, &queue->free_count); |
| 228 | ZFCP_LOG_DEBUG("free_count=%d\n", atomic_read(&queue->free_count)); |
| 229 | wake_up(&adapter->request_wq); |
| 230 | ZFCP_LOG_DEBUG("elements_processed=%d, free count=%d\n", |
| 231 | elements_processed, atomic_read(&queue->free_count)); |
| 232 | out: |
| 233 | return; |
| 234 | } |
| 235 | |
Volker Sameske | fea9d6c | 2006-08-02 11:05:16 +0200 | [diff] [blame] | 236 | /** |
Heiko Carstens | ca2d02c | 2007-05-08 11:17:54 +0200 | [diff] [blame] | 237 | * zfcp_qdio_reqid_check - checks for valid reqids. |
Volker Sameske | fea9d6c | 2006-08-02 11:05:16 +0200 | [diff] [blame] | 238 | */ |
Christof Schmitt | b03670e | 2007-05-07 16:35:04 +0200 | [diff] [blame] | 239 | static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter, |
| 240 | unsigned long req_id) |
Volker Sameske | fea9d6c | 2006-08-02 11:05:16 +0200 | [diff] [blame] | 241 | { |
| 242 | struct zfcp_fsf_req *fsf_req; |
| 243 | unsigned long flags; |
| 244 | |
| 245 | debug_long_event(adapter->erp_dbf, 4, req_id); |
| 246 | |
| 247 | spin_lock_irqsave(&adapter->req_list_lock, flags); |
Heiko Carstens | ca2d02c | 2007-05-08 11:17:54 +0200 | [diff] [blame] | 248 | fsf_req = zfcp_reqlist_find(adapter, req_id); |
Volker Sameske | fea9d6c | 2006-08-02 11:05:16 +0200 | [diff] [blame] | 249 | |
Heiko Carstens | ca2d02c | 2007-05-08 11:17:54 +0200 | [diff] [blame] | 250 | if (!fsf_req) |
| 251 | /* |
| 252 | * Unknown request means that we have potentially memory |
| 253 | * corruption and must stop the machine immediatly. |
| 254 | */ |
| 255 | panic("error: unknown request id (%ld) on adapter %s.\n", |
| 256 | req_id, zfcp_get_busid_by_adapter(adapter)); |
Volker Sameske | fea9d6c | 2006-08-02 11:05:16 +0200 | [diff] [blame] | 257 | |
Heiko Carstens | ca2d02c | 2007-05-08 11:17:54 +0200 | [diff] [blame] | 258 | zfcp_reqlist_remove(adapter, fsf_req); |
Volker Sameske | fea9d6c | 2006-08-02 11:05:16 +0200 | [diff] [blame] | 259 | atomic_dec(&adapter->reqs_active); |
| 260 | spin_unlock_irqrestore(&adapter->req_list_lock, flags); |
| 261 | |
| 262 | /* finish the FSF request */ |
| 263 | zfcp_fsf_req_complete(fsf_req); |
Volker Sameske | fea9d6c | 2006-08-02 11:05:16 +0200 | [diff] [blame] | 264 | } |
| 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | /* |
| 267 | * function: zfcp_qdio_response_handler |
| 268 | * |
| 269 | * purpose: is called by QDIO layer for completed SBALs in response queue |
| 270 | * |
| 271 | * returns: (void) |
| 272 | */ |
| 273 | static void |
| 274 | zfcp_qdio_response_handler(struct ccw_device *ccw_device, |
| 275 | unsigned int status, |
| 276 | unsigned int qdio_error, |
| 277 | unsigned int siga_error, |
| 278 | unsigned int queue_number, |
| 279 | int first_element, |
| 280 | int elements_processed, |
| 281 | unsigned long int_parm) |
| 282 | { |
| 283 | struct zfcp_adapter *adapter; |
| 284 | struct zfcp_qdio_queue *queue; |
| 285 | int buffer_index; |
| 286 | int i; |
| 287 | struct qdio_buffer *buffer; |
| 288 | int retval = 0; |
| 289 | u8 count; |
| 290 | u8 start; |
| 291 | volatile struct qdio_buffer_element *buffere = NULL; |
| 292 | int buffere_index; |
| 293 | |
| 294 | adapter = (struct zfcp_adapter *) int_parm; |
| 295 | queue = &adapter->response_queue; |
| 296 | |
| 297 | if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error, |
Maxim Shchetynin | 8a36e45 | 2005-09-13 21:50:38 +0200 | [diff] [blame] | 298 | siga_error, first_element, |
| 299 | elements_processed))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | goto out; |
| 301 | |
| 302 | /* |
| 303 | * we stored address of struct zfcp_adapter data structure |
| 304 | * associated with irq in int_parm |
| 305 | */ |
| 306 | |
| 307 | buffere = &(queue->buffer[first_element]->element[0]); |
| 308 | ZFCP_LOG_DEBUG("first BUFFERE flags=0x%x\n", buffere->flags); |
| 309 | /* |
| 310 | * go through all SBALs from input queue currently |
| 311 | * returned by QDIO layer |
| 312 | */ |
| 313 | |
| 314 | for (i = 0; i < elements_processed; i++) { |
| 315 | |
| 316 | buffer_index = first_element + i; |
| 317 | buffer_index %= QDIO_MAX_BUFFERS_PER_Q; |
| 318 | buffer = queue->buffer[buffer_index]; |
| 319 | |
| 320 | /* go through all SBALEs of SBAL */ |
| 321 | for (buffere_index = 0; |
| 322 | buffere_index < QDIO_MAX_ELEMENTS_PER_BUFFER; |
| 323 | buffere_index++) { |
| 324 | |
| 325 | /* look for QDIO request identifiers in SB */ |
| 326 | buffere = &buffer->element[buffere_index]; |
Christof Schmitt | b03670e | 2007-05-07 16:35:04 +0200 | [diff] [blame] | 327 | zfcp_qdio_reqid_check(adapter, |
| 328 | (unsigned long) buffere->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* |
| 331 | * A single used SBALE per inbound SBALE has been |
| 332 | * implemented by QDIO so far. Hope they will |
| 333 | * do some optimisation. Will need to change to |
| 334 | * unlikely() then. |
| 335 | */ |
| 336 | if (likely(buffere->flags & SBAL_FLAGS_LAST_ENTRY)) |
| 337 | break; |
| 338 | }; |
| 339 | |
| 340 | if (unlikely(!(buffere->flags & SBAL_FLAGS_LAST_ENTRY))) { |
| 341 | ZFCP_LOG_NORMAL("bug: End of inbound data " |
| 342 | "not marked!\n"); |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * put range of SBALs back to response queue |
| 348 | * (including SBALs which have already been free before) |
| 349 | */ |
| 350 | count = atomic_read(&queue->free_count) + elements_processed; |
| 351 | start = queue->free_index; |
| 352 | |
| 353 | ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, " |
| 354 | "queue_no=%i, index_in_queue=%i, count=%i, " |
| 355 | "buffers=0x%lx\n", |
| 356 | zfcp_get_busid_by_adapter(adapter), |
| 357 | QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT, |
| 358 | 0, start, count, (unsigned long) &queue->buffer[start]); |
| 359 | |
| 360 | retval = do_QDIO(ccw_device, |
| 361 | QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT, |
| 362 | 0, start, count, NULL); |
| 363 | |
| 364 | if (unlikely(retval)) { |
| 365 | atomic_set(&queue->free_count, count); |
| 366 | ZFCP_LOG_DEBUG("clearing of inbound data regions failed, " |
| 367 | "queues may be down " |
| 368 | "(count=%d, start=%d, retval=%d)\n", |
| 369 | count, start, retval); |
| 370 | } else { |
| 371 | queue->free_index += count; |
| 372 | queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; |
| 373 | atomic_set(&queue->free_count, 0); |
| 374 | ZFCP_LOG_TRACE("%i buffers enqueued to response " |
| 375 | "queue at position %i\n", count, start); |
| 376 | } |
| 377 | out: |
| 378 | return; |
| 379 | } |
| 380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | /** |
| 382 | * zfcp_qdio_sbale_get - return pointer to SBALE of qdio_queue |
| 383 | * @queue: queue from which SBALE should be returned |
| 384 | * @sbal: specifies number of SBAL in queue |
| 385 | * @sbale: specifes number of SBALE in SBAL |
| 386 | */ |
| 387 | static inline volatile struct qdio_buffer_element * |
| 388 | zfcp_qdio_sbale_get(struct zfcp_qdio_queue *queue, int sbal, int sbale) |
| 389 | { |
| 390 | return &queue->buffer[sbal]->element[sbale]; |
| 391 | } |
| 392 | |
| 393 | /** |
| 394 | * zfcp_qdio_sbale_req - return pointer to SBALE of request_queue for |
| 395 | * a struct zfcp_fsf_req |
| 396 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 397 | volatile struct qdio_buffer_element * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | zfcp_qdio_sbale_req(struct zfcp_fsf_req *fsf_req, int sbal, int sbale) |
| 399 | { |
| 400 | return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue, |
| 401 | sbal, sbale); |
| 402 | } |
| 403 | |
| 404 | /** |
| 405 | * zfcp_qdio_sbale_resp - return pointer to SBALE of response_queue for |
| 406 | * a struct zfcp_fsf_req |
| 407 | */ |
| 408 | static inline volatile struct qdio_buffer_element * |
| 409 | zfcp_qdio_sbale_resp(struct zfcp_fsf_req *fsf_req, int sbal, int sbale) |
| 410 | { |
| 411 | return zfcp_qdio_sbale_get(&fsf_req->adapter->response_queue, |
| 412 | sbal, sbale); |
| 413 | } |
| 414 | |
| 415 | /** |
| 416 | * zfcp_qdio_sbale_curr - return current SBALE on request_queue for |
| 417 | * a struct zfcp_fsf_req |
| 418 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 419 | volatile struct qdio_buffer_element * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | zfcp_qdio_sbale_curr(struct zfcp_fsf_req *fsf_req) |
| 421 | { |
| 422 | return zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, |
| 423 | fsf_req->sbale_curr); |
| 424 | } |
| 425 | |
| 426 | /** |
| 427 | * zfcp_qdio_sbal_limit - determine maximum number of SBALs that can be used |
| 428 | * on the request_queue for a struct zfcp_fsf_req |
| 429 | * @fsf_req: the number of the last SBAL that can be used is stored herein |
| 430 | * @max_sbals: used to pass an upper limit for the number of SBALs |
| 431 | * |
| 432 | * Note: We can assume at least one free SBAL in the request_queue when called. |
| 433 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 434 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals) |
| 436 | { |
| 437 | int count = atomic_read(&fsf_req->adapter->request_queue.free_count); |
| 438 | count = min(count, max_sbals); |
| 439 | fsf_req->sbal_last = fsf_req->sbal_first; |
| 440 | fsf_req->sbal_last += (count - 1); |
| 441 | fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q; |
| 442 | } |
| 443 | |
| 444 | /** |
| 445 | * zfcp_qdio_sbal_chain - chain SBALs if more than one SBAL is needed for a |
| 446 | * request |
| 447 | * @fsf_req: zfcp_fsf_req to be processed |
| 448 | * @sbtype: SBAL flags which have to be set in first SBALE of new SBAL |
| 449 | * |
| 450 | * This function changes sbal_curr, sbale_curr, sbal_number of fsf_req. |
| 451 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 452 | static volatile struct qdio_buffer_element * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype) |
| 454 | { |
| 455 | volatile struct qdio_buffer_element *sbale; |
| 456 | |
| 457 | /* set last entry flag in current SBALE of current SBAL */ |
| 458 | sbale = zfcp_qdio_sbale_curr(fsf_req); |
| 459 | sbale->flags |= SBAL_FLAGS_LAST_ENTRY; |
| 460 | |
| 461 | /* don't exceed last allowed SBAL */ |
| 462 | if (fsf_req->sbal_curr == fsf_req->sbal_last) |
| 463 | return NULL; |
| 464 | |
| 465 | /* set chaining flag in first SBALE of current SBAL */ |
| 466 | sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0); |
| 467 | sbale->flags |= SBAL_FLAGS0_MORE_SBALS; |
| 468 | |
| 469 | /* calculate index of next SBAL */ |
| 470 | fsf_req->sbal_curr++; |
| 471 | fsf_req->sbal_curr %= QDIO_MAX_BUFFERS_PER_Q; |
| 472 | |
| 473 | /* keep this requests number of SBALs up-to-date */ |
| 474 | fsf_req->sbal_number++; |
| 475 | |
| 476 | /* start at first SBALE of new SBAL */ |
| 477 | fsf_req->sbale_curr = 0; |
| 478 | |
| 479 | /* set storage-block type for new SBAL */ |
| 480 | sbale = zfcp_qdio_sbale_curr(fsf_req); |
| 481 | sbale->flags |= sbtype; |
| 482 | |
| 483 | return sbale; |
| 484 | } |
| 485 | |
| 486 | /** |
| 487 | * zfcp_qdio_sbale_next - switch to next SBALE, chain SBALs if needed |
| 488 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 489 | static volatile struct qdio_buffer_element * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype) |
| 491 | { |
| 492 | if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL) |
| 493 | return zfcp_qdio_sbal_chain(fsf_req, sbtype); |
| 494 | |
| 495 | fsf_req->sbale_curr++; |
| 496 | |
| 497 | return zfcp_qdio_sbale_curr(fsf_req); |
| 498 | } |
| 499 | |
| 500 | /** |
| 501 | * zfcp_qdio_sbals_zero - initialize SBALs between first and last in queue |
| 502 | * with zero from |
| 503 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 504 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *queue, int first, int last) |
| 506 | { |
| 507 | struct qdio_buffer **buf = queue->buffer; |
| 508 | int curr = first; |
| 509 | int count = 0; |
| 510 | |
| 511 | for(;;) { |
| 512 | curr %= QDIO_MAX_BUFFERS_PER_Q; |
| 513 | count++; |
| 514 | memset(buf[curr], 0, sizeof(struct qdio_buffer)); |
| 515 | if (curr == last) |
| 516 | break; |
| 517 | curr++; |
| 518 | } |
| 519 | return count; |
| 520 | } |
| 521 | |
| 522 | |
| 523 | /** |
| 524 | * zfcp_qdio_sbals_wipe - reset all changes in SBALs for an fsf_req |
| 525 | */ |
| 526 | static inline int |
| 527 | zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *fsf_req) |
| 528 | { |
| 529 | return zfcp_qdio_sbals_zero(&fsf_req->adapter->request_queue, |
| 530 | fsf_req->sbal_first, fsf_req->sbal_curr); |
| 531 | } |
| 532 | |
| 533 | |
| 534 | /** |
| 535 | * zfcp_qdio_sbale_fill - set address and lenght in current SBALE |
| 536 | * on request_queue |
| 537 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 538 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | zfcp_qdio_sbale_fill(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, |
| 540 | void *addr, int length) |
| 541 | { |
| 542 | volatile struct qdio_buffer_element *sbale; |
| 543 | |
| 544 | sbale = zfcp_qdio_sbale_curr(fsf_req); |
| 545 | sbale->addr = addr; |
| 546 | sbale->length = length; |
| 547 | } |
| 548 | |
| 549 | /** |
| 550 | * zfcp_qdio_sbals_from_segment - map memory segment to SBALE(s) |
| 551 | * @fsf_req: request to be processed |
| 552 | * @sbtype: SBALE flags |
| 553 | * @start_addr: address of memory segment |
| 554 | * @total_length: length of memory segment |
| 555 | * |
| 556 | * Alignment and length of the segment determine how many SBALEs are needed |
| 557 | * for the memory segment. |
| 558 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 559 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | zfcp_qdio_sbals_from_segment(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, |
| 561 | void *start_addr, unsigned long total_length) |
| 562 | { |
| 563 | unsigned long remaining, length; |
| 564 | void *addr; |
| 565 | |
| 566 | /* split segment up heeding page boundaries */ |
| 567 | for (addr = start_addr, remaining = total_length; remaining > 0; |
| 568 | addr += length, remaining -= length) { |
| 569 | /* get next free SBALE for new piece */ |
| 570 | if (NULL == zfcp_qdio_sbale_next(fsf_req, sbtype)) { |
| 571 | /* no SBALE left, clean up and leave */ |
| 572 | zfcp_qdio_sbals_wipe(fsf_req); |
| 573 | return -EINVAL; |
| 574 | } |
| 575 | /* calculate length of new piece */ |
| 576 | length = min(remaining, |
| 577 | (PAGE_SIZE - ((unsigned long) addr & |
| 578 | (PAGE_SIZE - 1)))); |
| 579 | /* fill current SBALE with calculated piece */ |
| 580 | zfcp_qdio_sbale_fill(fsf_req, sbtype, addr, length); |
| 581 | } |
| 582 | return total_length; |
| 583 | } |
| 584 | |
| 585 | |
| 586 | /** |
| 587 | * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list |
| 588 | * @fsf_req: request to be processed |
| 589 | * @sbtype: SBALE flags |
| 590 | * @sg: scatter-gather list |
| 591 | * @sg_count: number of elements in scatter-gather list |
| 592 | * @max_sbals: upper bound for number of SBALs to be used |
| 593 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 594 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, |
| 596 | struct scatterlist *sg, int sg_count, int max_sbals) |
| 597 | { |
| 598 | int sg_index; |
| 599 | struct scatterlist *sg_segment; |
| 600 | int retval; |
| 601 | volatile struct qdio_buffer_element *sbale; |
| 602 | int bytes = 0; |
| 603 | |
| 604 | /* figure out last allowed SBAL */ |
| 605 | zfcp_qdio_sbal_limit(fsf_req, max_sbals); |
| 606 | |
| 607 | /* set storage-block type for current SBAL */ |
| 608 | sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0); |
| 609 | sbale->flags |= sbtype; |
| 610 | |
| 611 | /* process all segements of scatter-gather list */ |
| 612 | for (sg_index = 0, sg_segment = sg, bytes = 0; |
| 613 | sg_index < sg_count; |
| 614 | sg_index++, sg_segment++) { |
| 615 | retval = zfcp_qdio_sbals_from_segment( |
| 616 | fsf_req, |
| 617 | sbtype, |
| 618 | zfcp_sg_to_address(sg_segment), |
| 619 | sg_segment->length); |
| 620 | if (retval < 0) { |
| 621 | bytes = retval; |
| 622 | goto out; |
| 623 | } else |
| 624 | bytes += retval; |
| 625 | } |
| 626 | /* assume that no other SBALEs are to follow in the same SBAL */ |
| 627 | sbale = zfcp_qdio_sbale_curr(fsf_req); |
| 628 | sbale->flags |= SBAL_FLAGS_LAST_ENTRY; |
| 629 | out: |
| 630 | return bytes; |
| 631 | } |
| 632 | |
| 633 | |
| 634 | /** |
| 635 | * zfcp_qdio_sbals_from_buffer - fill SBALs from buffer |
| 636 | * @fsf_req: request to be processed |
| 637 | * @sbtype: SBALE flags |
| 638 | * @buffer: data buffer |
| 639 | * @length: length of buffer |
| 640 | * @max_sbals: upper bound for number of SBALs to be used |
| 641 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 642 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | zfcp_qdio_sbals_from_buffer(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, |
| 644 | void *buffer, unsigned long length, int max_sbals) |
| 645 | { |
| 646 | struct scatterlist sg_segment; |
| 647 | |
| 648 | zfcp_address_to_sg(buffer, &sg_segment); |
| 649 | sg_segment.length = length; |
| 650 | |
| 651 | return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, &sg_segment, 1, |
| 652 | max_sbals); |
| 653 | } |
| 654 | |
| 655 | |
| 656 | /** |
| 657 | * zfcp_qdio_sbals_from_scsicmnd - fill SBALs from scsi command |
| 658 | * @fsf_req: request to be processed |
| 659 | * @sbtype: SBALE flags |
| 660 | * @scsi_cmnd: either scatter-gather list or buffer contained herein is used |
| 661 | * to fill SBALs |
| 662 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 663 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | zfcp_qdio_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req, |
| 665 | unsigned long sbtype, struct scsi_cmnd *scsi_cmnd) |
| 666 | { |
| 667 | if (scsi_cmnd->use_sg) { |
| 668 | return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, |
| 669 | (struct scatterlist *) |
| 670 | scsi_cmnd->request_buffer, |
| 671 | scsi_cmnd->use_sg, |
| 672 | ZFCP_MAX_SBALS_PER_REQ); |
| 673 | } else { |
| 674 | return zfcp_qdio_sbals_from_buffer(fsf_req, sbtype, |
| 675 | scsi_cmnd->request_buffer, |
| 676 | scsi_cmnd->request_bufflen, |
| 677 | ZFCP_MAX_SBALS_PER_REQ); |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | /** |
| 682 | * zfcp_qdio_determine_pci - set PCI flag in first SBALE on qdio queue if needed |
| 683 | */ |
| 684 | int |
| 685 | zfcp_qdio_determine_pci(struct zfcp_qdio_queue *req_queue, |
| 686 | struct zfcp_fsf_req *fsf_req) |
| 687 | { |
| 688 | int new_distance_from_int; |
| 689 | int pci_pos; |
| 690 | volatile struct qdio_buffer_element *sbale; |
| 691 | |
| 692 | new_distance_from_int = req_queue->distance_from_int + |
| 693 | fsf_req->sbal_number; |
| 694 | |
| 695 | if (unlikely(new_distance_from_int >= ZFCP_QDIO_PCI_INTERVAL)) { |
| 696 | new_distance_from_int %= ZFCP_QDIO_PCI_INTERVAL; |
| 697 | pci_pos = fsf_req->sbal_first; |
| 698 | pci_pos += fsf_req->sbal_number; |
| 699 | pci_pos -= new_distance_from_int; |
| 700 | pci_pos -= 1; |
| 701 | pci_pos %= QDIO_MAX_BUFFERS_PER_Q; |
| 702 | sbale = zfcp_qdio_sbale_req(fsf_req, pci_pos, 0); |
| 703 | sbale->flags |= SBAL_FLAGS0_PCI; |
| 704 | } |
| 705 | return new_distance_from_int; |
| 706 | } |
| 707 | |
| 708 | /* |
| 709 | * function: zfcp_zero_sbals |
| 710 | * |
| 711 | * purpose: zeros specified range of SBALs |
| 712 | * |
| 713 | * returns: |
| 714 | */ |
| 715 | void |
| 716 | zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count) |
| 717 | { |
| 718 | int cur_pos; |
| 719 | int index; |
| 720 | |
| 721 | for (cur_pos = first; cur_pos < (first + clean_count); cur_pos++) { |
| 722 | index = cur_pos % QDIO_MAX_BUFFERS_PER_Q; |
| 723 | memset(buf[index], 0, sizeof (struct qdio_buffer)); |
| 724 | ZFCP_LOG_TRACE("zeroing BUFFER %d at address %p\n", |
| 725 | index, buf[index]); |
| 726 | } |
| 727 | } |
| 728 | |
| 729 | #undef ZFCP_LOG_AREA |