Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* ------------------------------------------------------------ |
| 2 | * rpa_vscsi.c |
| 3 | * (C) Copyright IBM Corporation 1994, 2003 |
| 4 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) |
| 5 | * Santiago Leon (santil@us.ibm.com) |
| 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 of the License, or |
| 10 | * (at your option) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 20 | * USA |
| 21 | * |
| 22 | * ------------------------------------------------------------ |
| 23 | * RPA-specific functions of the SCSI host adapter for Virtual I/O devices |
| 24 | * |
| 25 | * This driver allows the Linux SCSI peripheral drivers to directly |
| 26 | * access devices in the hosting partition, either on an iSeries |
| 27 | * hypervisor system or a converged hypervisor system. |
| 28 | */ |
| 29 | |
| 30 | #include <asm/vio.h> |
Stephen Rothwell | 71d276d | 2005-08-17 16:41:44 +1000 | [diff] [blame] | 31 | #include <asm/prom.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/iommu.h> |
| 33 | #include <asm/hvcall.h> |
| 34 | #include <linux/dma-mapping.h> |
| 35 | #include <linux/interrupt.h> |
| 36 | #include "ibmvscsi.h" |
Linda Xie | b4687ca | 2005-06-27 17:01:48 -0500 | [diff] [blame] | 37 | |
| 38 | static char partition_name[97] = "UNKNOWN"; |
| 39 | static unsigned int partition_number = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | /* ------------------------------------------------------------ |
| 42 | * Routines for managing the command/response queue |
| 43 | */ |
| 44 | /** |
| 45 | * ibmvscsi_handle_event: - Interrupt handler for crq events |
| 46 | * @irq: number of irq to handle, not used |
| 47 | * @dev_instance: ibmvscsi_host_data of host that received interrupt |
| 48 | * @regs: pt_regs with registers |
| 49 | * |
| 50 | * Disables interrupts and schedules srp_task |
| 51 | * Always returns IRQ_HANDLED |
| 52 | */ |
| 53 | static irqreturn_t ibmvscsi_handle_event(int irq, |
| 54 | void *dev_instance, |
| 55 | struct pt_regs *regs) |
| 56 | { |
| 57 | struct ibmvscsi_host_data *hostdata = |
| 58 | (struct ibmvscsi_host_data *)dev_instance; |
| 59 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); |
| 60 | tasklet_schedule(&hostdata->srp_task); |
| 61 | return IRQ_HANDLED; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * release_crq_queue: - Deallocates data and unregisters CRQ |
| 66 | * @queue: crq_queue to initialize and register |
| 67 | * @host_data: ibmvscsi_host_data of host |
| 68 | * |
| 69 | * Frees irq, deallocates a page for messages, unmaps dma, and unregisters |
| 70 | * the crq with the hypervisor. |
| 71 | */ |
| 72 | void ibmvscsi_release_crq_queue(struct crq_queue *queue, |
| 73 | struct ibmvscsi_host_data *hostdata, |
| 74 | int max_requests) |
| 75 | { |
| 76 | long rc; |
| 77 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
| 78 | free_irq(vdev->irq, (void *)hostdata); |
| 79 | tasklet_kill(&hostdata->srp_task); |
| 80 | do { |
| 81 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 82 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | dma_unmap_single(hostdata->dev, |
| 84 | queue->msg_token, |
| 85 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); |
| 86 | free_page((unsigned long)queue->msgs); |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * crq_queue_next_crq: - Returns the next entry in message queue |
| 91 | * @queue: crq_queue to use |
| 92 | * |
| 93 | * Returns pointer to next entry in queue, or NULL if there are no new |
| 94 | * entried in the CRQ. |
| 95 | */ |
| 96 | static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) |
| 97 | { |
| 98 | struct viosrp_crq *crq; |
| 99 | unsigned long flags; |
| 100 | |
| 101 | spin_lock_irqsave(&queue->lock, flags); |
| 102 | crq = &queue->msgs[queue->cur]; |
| 103 | if (crq->valid & 0x80) { |
| 104 | if (++queue->cur == queue->size) |
| 105 | queue->cur = 0; |
| 106 | } else |
| 107 | crq = NULL; |
| 108 | spin_unlock_irqrestore(&queue->lock, flags); |
| 109 | |
| 110 | return crq; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * ibmvscsi_send_crq: - Send a CRQ |
| 115 | * @hostdata: the adapter |
| 116 | * @word1: the first 64 bits of the data |
| 117 | * @word2: the second 64 bits of the data |
| 118 | */ |
| 119 | int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2) |
| 120 | { |
| 121 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
| 122 | |
| 123 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * ibmvscsi_task: - Process srps asynchronously |
| 128 | * @data: ibmvscsi_host_data of host |
| 129 | */ |
| 130 | static void ibmvscsi_task(void *data) |
| 131 | { |
| 132 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; |
| 133 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
| 134 | struct viosrp_crq *crq; |
| 135 | int done = 0; |
| 136 | |
| 137 | while (!done) { |
| 138 | /* Pull all the valid messages off the CRQ */ |
| 139 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { |
| 140 | ibmvscsi_handle_crq(crq, hostdata); |
| 141 | crq->valid = 0x00; |
| 142 | } |
| 143 | |
| 144 | vio_enable_interrupts(vdev); |
| 145 | if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { |
| 146 | vio_disable_interrupts(vdev); |
| 147 | ibmvscsi_handle_crq(crq, hostdata); |
| 148 | crq->valid = 0x00; |
| 149 | } else { |
| 150 | done = 1; |
| 151 | } |
| 152 | } |
| 153 | } |
| 154 | |
Linda Xie | b4687ca | 2005-06-27 17:01:48 -0500 | [diff] [blame] | 155 | static void gather_partition_info(void) |
| 156 | { |
| 157 | struct device_node *rootdn; |
| 158 | |
| 159 | char *ppartition_name; |
| 160 | unsigned int *p_number_ptr; |
| 161 | |
| 162 | /* Retrieve information about this partition */ |
| 163 | rootdn = find_path_device("/"); |
| 164 | if (!rootdn) { |
| 165 | return; |
| 166 | } |
| 167 | |
| 168 | ppartition_name = |
| 169 | get_property(rootdn, "ibm,partition-name", NULL); |
| 170 | if (ppartition_name) |
| 171 | strncpy(partition_name, ppartition_name, |
| 172 | sizeof(partition_name)); |
| 173 | p_number_ptr = |
| 174 | (unsigned int *)get_property(rootdn, "ibm,partition-no", |
| 175 | NULL); |
| 176 | if (p_number_ptr) |
| 177 | partition_number = *p_number_ptr; |
| 178 | } |
| 179 | |
| 180 | static void set_adapter_info(struct ibmvscsi_host_data *hostdata) |
| 181 | { |
| 182 | memset(&hostdata->madapter_info, 0x00, |
| 183 | sizeof(hostdata->madapter_info)); |
| 184 | |
| 185 | printk(KERN_INFO "rpa_vscsi: SPR_VERSION: %s\n", SRP_VERSION); |
| 186 | strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); |
| 187 | |
| 188 | strncpy(hostdata->madapter_info.partition_name, partition_name, |
| 189 | sizeof(hostdata->madapter_info.partition_name)); |
| 190 | |
| 191 | hostdata->madapter_info.partition_number = partition_number; |
| 192 | |
| 193 | hostdata->madapter_info.mad_version = 1; |
| 194 | hostdata->madapter_info.os_type = 2; |
| 195 | } |
| 196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | /** |
| 198 | * initialize_crq_queue: - Initializes and registers CRQ with hypervisor |
| 199 | * @queue: crq_queue to initialize and register |
| 200 | * @hostdata: ibmvscsi_host_data of host |
| 201 | * |
| 202 | * Allocates a page for messages, maps it for dma, and registers |
| 203 | * the crq with the hypervisor. |
| 204 | * Returns zero on success. |
| 205 | */ |
| 206 | int ibmvscsi_init_crq_queue(struct crq_queue *queue, |
| 207 | struct ibmvscsi_host_data *hostdata, |
| 208 | int max_requests) |
| 209 | { |
| 210 | int rc; |
| 211 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
| 212 | |
| 213 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); |
| 214 | |
| 215 | if (!queue->msgs) |
| 216 | goto malloc_failed; |
| 217 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); |
| 218 | |
| 219 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, |
| 220 | queue->size * sizeof(*queue->msgs), |
| 221 | DMA_BIDIRECTIONAL); |
| 222 | |
| 223 | if (dma_mapping_error(queue->msg_token)) |
| 224 | goto map_failed; |
| 225 | |
Linda Xie | b4687ca | 2005-06-27 17:01:48 -0500 | [diff] [blame] | 226 | gather_partition_info(); |
| 227 | set_adapter_info(hostdata); |
| 228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | rc = plpar_hcall_norets(H_REG_CRQ, |
| 230 | vdev->unit_address, |
| 231 | queue->msg_token, PAGE_SIZE); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 232 | if (rc == H_RESOURCE) |
Dave C Boutcher | bb58596 | 2005-11-15 09:53:00 -0600 | [diff] [blame] | 233 | /* maybe kexecing and resource is busy. try a reset */ |
| 234 | rc = ibmvscsi_reset_crq_queue(queue, |
| 235 | hostdata); |
| 236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | if (rc == 2) { |
| 238 | /* Adapter is good, but other end is not ready */ |
| 239 | printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n"); |
| 240 | } else if (rc != 0) { |
| 241 | printk(KERN_WARNING "ibmvscsi: Error %d opening adapter\n", rc); |
| 242 | goto reg_crq_failed; |
| 243 | } |
| 244 | |
| 245 | if (request_irq(vdev->irq, |
| 246 | ibmvscsi_handle_event, |
| 247 | 0, "ibmvscsi", (void *)hostdata) != 0) { |
| 248 | printk(KERN_ERR "ibmvscsi: couldn't register irq 0x%x\n", |
| 249 | vdev->irq); |
| 250 | goto req_irq_failed; |
| 251 | } |
| 252 | |
| 253 | rc = vio_enable_interrupts(vdev); |
| 254 | if (rc != 0) { |
| 255 | printk(KERN_ERR "ibmvscsi: Error %d enabling interrupts!!!\n", |
| 256 | rc); |
| 257 | goto req_irq_failed; |
| 258 | } |
| 259 | |
| 260 | queue->cur = 0; |
| 261 | spin_lock_init(&queue->lock); |
| 262 | |
| 263 | tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, |
| 264 | (unsigned long)hostdata); |
| 265 | |
| 266 | return 0; |
| 267 | |
| 268 | req_irq_failed: |
| 269 | do { |
| 270 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 271 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | reg_crq_failed: |
| 273 | dma_unmap_single(hostdata->dev, |
| 274 | queue->msg_token, |
| 275 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); |
| 276 | map_failed: |
| 277 | free_page((unsigned long)queue->msgs); |
| 278 | malloc_failed: |
| 279 | return -1; |
| 280 | } |
| 281 | |
| 282 | /** |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 283 | * reenable_crq_queue: - reenables a crq after |
| 284 | * @queue: crq_queue to initialize and register |
| 285 | * @hostdata: ibmvscsi_host_data of host |
| 286 | * |
| 287 | */ |
| 288 | int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, |
| 289 | struct ibmvscsi_host_data *hostdata) |
| 290 | { |
| 291 | int rc; |
| 292 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
| 293 | |
| 294 | /* Re-enable the CRQ */ |
| 295 | do { |
| 296 | rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 297 | } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 298 | |
| 299 | if (rc) |
| 300 | printk(KERN_ERR "ibmvscsi: Error %d enabling adapter\n", rc); |
| 301 | return rc; |
| 302 | } |
| 303 | |
| 304 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | * reset_crq_queue: - resets a crq after a failure |
| 306 | * @queue: crq_queue to initialize and register |
| 307 | * @hostdata: ibmvscsi_host_data of host |
| 308 | * |
| 309 | */ |
Dave C Boutcher | bb58596 | 2005-11-15 09:53:00 -0600 | [diff] [blame] | 310 | int ibmvscsi_reset_crq_queue(struct crq_queue *queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | struct ibmvscsi_host_data *hostdata) |
| 312 | { |
| 313 | int rc; |
| 314 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
| 315 | |
| 316 | /* Close the CRQ */ |
| 317 | do { |
| 318 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 319 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
| 321 | /* Clean out the queue */ |
| 322 | memset(queue->msgs, 0x00, PAGE_SIZE); |
| 323 | queue->cur = 0; |
| 324 | |
Linda Xie | b4687ca | 2005-06-27 17:01:48 -0500 | [diff] [blame] | 325 | set_adapter_info(hostdata); |
| 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | /* And re-open it again */ |
| 328 | rc = plpar_hcall_norets(H_REG_CRQ, |
| 329 | vdev->unit_address, |
| 330 | queue->msg_token, PAGE_SIZE); |
| 331 | if (rc == 2) { |
| 332 | /* Adapter is good, but other end is not ready */ |
| 333 | printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n"); |
| 334 | } else if (rc != 0) { |
| 335 | printk(KERN_WARNING |
| 336 | "ibmvscsi: couldn't register crq--rc 0x%x\n", rc); |
| 337 | } |
Dave C Boutcher | bb58596 | 2005-11-15 09:53:00 -0600 | [diff] [blame] | 338 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |