Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 1 | /* |
| 2 | * AMD Cryptographic Coprocessor (CCP) driver |
| 3 | * |
| 4 | * Copyright (C) 2013 Advanced Micro Devices, Inc. |
| 5 | * |
| 6 | * Author: Tom Lendacky <thomas.lendacky@amd.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/kthread.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/mutex.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/hw_random.h> |
| 22 | #include <linux/cpu.h> |
| 23 | #include <asm/cpu_device_id.h> |
| 24 | #include <linux/ccp.h> |
| 25 | |
| 26 | #include "ccp-dev.h" |
| 27 | |
| 28 | MODULE_AUTHOR("Tom Lendacky <thomas.lendacky@amd.com>"); |
| 29 | MODULE_LICENSE("GPL"); |
| 30 | MODULE_VERSION("1.0.0"); |
| 31 | MODULE_DESCRIPTION("AMD Cryptographic Coprocessor driver"); |
| 32 | |
Tom Lendacky | 530abd8 | 2014-01-24 16:18:14 -0600 | [diff] [blame] | 33 | struct ccp_tasklet_data { |
| 34 | struct completion completion; |
| 35 | struct ccp_cmd *cmd; |
| 36 | }; |
| 37 | |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 38 | |
| 39 | static struct ccp_device *ccp_dev; |
| 40 | static inline struct ccp_device *ccp_get_device(void) |
| 41 | { |
| 42 | return ccp_dev; |
| 43 | } |
| 44 | |
| 45 | static inline void ccp_add_device(struct ccp_device *ccp) |
| 46 | { |
| 47 | ccp_dev = ccp; |
| 48 | } |
| 49 | |
| 50 | static inline void ccp_del_device(struct ccp_device *ccp) |
| 51 | { |
| 52 | ccp_dev = NULL; |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * ccp_enqueue_cmd - queue an operation for processing by the CCP |
| 57 | * |
| 58 | * @cmd: ccp_cmd struct to be processed |
| 59 | * |
| 60 | * Queue a cmd to be processed by the CCP. If queueing the cmd |
| 61 | * would exceed the defined length of the cmd queue the cmd will |
| 62 | * only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will |
| 63 | * result in a return code of -EBUSY. |
| 64 | * |
| 65 | * The callback routine specified in the ccp_cmd struct will be |
| 66 | * called to notify the caller of completion (if the cmd was not |
| 67 | * backlogged) or advancement out of the backlog. If the cmd has |
| 68 | * advanced out of the backlog the "err" value of the callback |
| 69 | * will be -EINPROGRESS. Any other "err" value during callback is |
| 70 | * the result of the operation. |
| 71 | * |
| 72 | * The cmd has been successfully queued if: |
| 73 | * the return code is -EINPROGRESS or |
| 74 | * the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set |
| 75 | */ |
| 76 | int ccp_enqueue_cmd(struct ccp_cmd *cmd) |
| 77 | { |
| 78 | struct ccp_device *ccp = ccp_get_device(); |
| 79 | unsigned long flags; |
| 80 | unsigned int i; |
| 81 | int ret; |
| 82 | |
| 83 | if (!ccp) |
| 84 | return -ENODEV; |
| 85 | |
| 86 | /* Caller must supply a callback routine */ |
| 87 | if (!cmd->callback) |
| 88 | return -EINVAL; |
| 89 | |
| 90 | cmd->ccp = ccp; |
| 91 | |
| 92 | spin_lock_irqsave(&ccp->cmd_lock, flags); |
| 93 | |
| 94 | i = ccp->cmd_q_count; |
| 95 | |
| 96 | if (ccp->cmd_count >= MAX_CMD_QLEN) { |
| 97 | ret = -EBUSY; |
| 98 | if (cmd->flags & CCP_CMD_MAY_BACKLOG) |
| 99 | list_add_tail(&cmd->entry, &ccp->backlog); |
| 100 | } else { |
| 101 | ret = -EINPROGRESS; |
| 102 | ccp->cmd_count++; |
| 103 | list_add_tail(&cmd->entry, &ccp->cmd); |
| 104 | |
| 105 | /* Find an idle queue */ |
| 106 | if (!ccp->suspending) { |
| 107 | for (i = 0; i < ccp->cmd_q_count; i++) { |
| 108 | if (ccp->cmd_q[i].active) |
| 109 | continue; |
| 110 | |
| 111 | break; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | spin_unlock_irqrestore(&ccp->cmd_lock, flags); |
| 117 | |
| 118 | /* If we found an idle queue, wake it up */ |
| 119 | if (i < ccp->cmd_q_count) |
| 120 | wake_up_process(ccp->cmd_q[i].kthread); |
| 121 | |
| 122 | return ret; |
| 123 | } |
| 124 | EXPORT_SYMBOL_GPL(ccp_enqueue_cmd); |
| 125 | |
| 126 | static void ccp_do_cmd_backlog(struct work_struct *work) |
| 127 | { |
| 128 | struct ccp_cmd *cmd = container_of(work, struct ccp_cmd, work); |
| 129 | struct ccp_device *ccp = cmd->ccp; |
| 130 | unsigned long flags; |
| 131 | unsigned int i; |
| 132 | |
| 133 | cmd->callback(cmd->data, -EINPROGRESS); |
| 134 | |
| 135 | spin_lock_irqsave(&ccp->cmd_lock, flags); |
| 136 | |
| 137 | ccp->cmd_count++; |
| 138 | list_add_tail(&cmd->entry, &ccp->cmd); |
| 139 | |
| 140 | /* Find an idle queue */ |
| 141 | for (i = 0; i < ccp->cmd_q_count; i++) { |
| 142 | if (ccp->cmd_q[i].active) |
| 143 | continue; |
| 144 | |
| 145 | break; |
| 146 | } |
| 147 | |
| 148 | spin_unlock_irqrestore(&ccp->cmd_lock, flags); |
| 149 | |
| 150 | /* If we found an idle queue, wake it up */ |
| 151 | if (i < ccp->cmd_q_count) |
| 152 | wake_up_process(ccp->cmd_q[i].kthread); |
| 153 | } |
| 154 | |
| 155 | static struct ccp_cmd *ccp_dequeue_cmd(struct ccp_cmd_queue *cmd_q) |
| 156 | { |
| 157 | struct ccp_device *ccp = cmd_q->ccp; |
| 158 | struct ccp_cmd *cmd = NULL; |
| 159 | struct ccp_cmd *backlog = NULL; |
| 160 | unsigned long flags; |
| 161 | |
| 162 | spin_lock_irqsave(&ccp->cmd_lock, flags); |
| 163 | |
| 164 | cmd_q->active = 0; |
| 165 | |
| 166 | if (ccp->suspending) { |
| 167 | cmd_q->suspended = 1; |
| 168 | |
| 169 | spin_unlock_irqrestore(&ccp->cmd_lock, flags); |
| 170 | wake_up_interruptible(&ccp->suspend_queue); |
| 171 | |
| 172 | return NULL; |
| 173 | } |
| 174 | |
| 175 | if (ccp->cmd_count) { |
| 176 | cmd_q->active = 1; |
| 177 | |
| 178 | cmd = list_first_entry(&ccp->cmd, struct ccp_cmd, entry); |
| 179 | list_del(&cmd->entry); |
| 180 | |
| 181 | ccp->cmd_count--; |
| 182 | } |
| 183 | |
| 184 | if (!list_empty(&ccp->backlog)) { |
| 185 | backlog = list_first_entry(&ccp->backlog, struct ccp_cmd, |
| 186 | entry); |
| 187 | list_del(&backlog->entry); |
| 188 | } |
| 189 | |
| 190 | spin_unlock_irqrestore(&ccp->cmd_lock, flags); |
| 191 | |
| 192 | if (backlog) { |
| 193 | INIT_WORK(&backlog->work, ccp_do_cmd_backlog); |
| 194 | schedule_work(&backlog->work); |
| 195 | } |
| 196 | |
| 197 | return cmd; |
| 198 | } |
| 199 | |
Tom Lendacky | 530abd8 | 2014-01-24 16:18:14 -0600 | [diff] [blame] | 200 | static void ccp_do_cmd_complete(unsigned long data) |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 201 | { |
Tom Lendacky | 530abd8 | 2014-01-24 16:18:14 -0600 | [diff] [blame] | 202 | struct ccp_tasklet_data *tdata = (struct ccp_tasklet_data *)data; |
| 203 | struct ccp_cmd *cmd = tdata->cmd; |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 204 | |
| 205 | cmd->callback(cmd->data, cmd->ret); |
Tom Lendacky | 530abd8 | 2014-01-24 16:18:14 -0600 | [diff] [blame] | 206 | complete(&tdata->completion); |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static int ccp_cmd_queue_thread(void *data) |
| 210 | { |
| 211 | struct ccp_cmd_queue *cmd_q = (struct ccp_cmd_queue *)data; |
| 212 | struct ccp_cmd *cmd; |
Tom Lendacky | 530abd8 | 2014-01-24 16:18:14 -0600 | [diff] [blame] | 213 | struct ccp_tasklet_data tdata; |
| 214 | struct tasklet_struct tasklet; |
| 215 | |
| 216 | tasklet_init(&tasklet, ccp_do_cmd_complete, (unsigned long)&tdata); |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 217 | |
| 218 | set_current_state(TASK_INTERRUPTIBLE); |
| 219 | while (!kthread_should_stop()) { |
| 220 | schedule(); |
| 221 | |
| 222 | set_current_state(TASK_INTERRUPTIBLE); |
| 223 | |
| 224 | cmd = ccp_dequeue_cmd(cmd_q); |
| 225 | if (!cmd) |
| 226 | continue; |
| 227 | |
| 228 | __set_current_state(TASK_RUNNING); |
| 229 | |
| 230 | /* Execute the command */ |
| 231 | cmd->ret = ccp_run_cmd(cmd_q, cmd); |
| 232 | |
| 233 | /* Schedule the completion callback */ |
Tom Lendacky | 530abd8 | 2014-01-24 16:18:14 -0600 | [diff] [blame] | 234 | tdata.cmd = cmd; |
| 235 | init_completion(&tdata.completion); |
| 236 | tasklet_schedule(&tasklet); |
| 237 | wait_for_completion(&tdata.completion); |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | __set_current_state(TASK_RUNNING); |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait) |
| 246 | { |
| 247 | struct ccp_device *ccp = container_of(rng, struct ccp_device, hwrng); |
| 248 | u32 trng_value; |
| 249 | int len = min_t(int, sizeof(trng_value), max); |
| 250 | |
| 251 | /* |
| 252 | * Locking is provided by the caller so we can update device |
| 253 | * hwrng-related fields safely |
| 254 | */ |
| 255 | trng_value = ioread32(ccp->io_regs + TRNG_OUT_REG); |
| 256 | if (!trng_value) { |
| 257 | /* Zero is returned if not data is available or if a |
| 258 | * bad-entropy error is present. Assume an error if |
| 259 | * we exceed TRNG_RETRIES reads of zero. |
| 260 | */ |
| 261 | if (ccp->hwrng_retries++ > TRNG_RETRIES) |
| 262 | return -EIO; |
| 263 | |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | /* Reset the counter and save the rng value */ |
| 268 | ccp->hwrng_retries = 0; |
| 269 | memcpy(data, &trng_value, len); |
| 270 | |
| 271 | return len; |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * ccp_alloc_struct - allocate and initialize the ccp_device struct |
| 276 | * |
| 277 | * @dev: device struct of the CCP |
| 278 | */ |
| 279 | struct ccp_device *ccp_alloc_struct(struct device *dev) |
| 280 | { |
| 281 | struct ccp_device *ccp; |
| 282 | |
| 283 | ccp = kzalloc(sizeof(*ccp), GFP_KERNEL); |
| 284 | if (ccp == NULL) { |
| 285 | dev_err(dev, "unable to allocate device struct\n"); |
| 286 | return NULL; |
| 287 | } |
| 288 | ccp->dev = dev; |
| 289 | |
| 290 | INIT_LIST_HEAD(&ccp->cmd); |
| 291 | INIT_LIST_HEAD(&ccp->backlog); |
| 292 | |
| 293 | spin_lock_init(&ccp->cmd_lock); |
| 294 | mutex_init(&ccp->req_mutex); |
| 295 | mutex_init(&ccp->ksb_mutex); |
| 296 | ccp->ksb_count = KSB_COUNT; |
| 297 | ccp->ksb_start = 0; |
| 298 | |
| 299 | return ccp; |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * ccp_init - initialize the CCP device |
| 304 | * |
| 305 | * @ccp: ccp_device struct |
| 306 | */ |
| 307 | int ccp_init(struct ccp_device *ccp) |
| 308 | { |
| 309 | struct device *dev = ccp->dev; |
| 310 | struct ccp_cmd_queue *cmd_q; |
| 311 | struct dma_pool *dma_pool; |
| 312 | char dma_pool_name[MAX_DMAPOOL_NAME_LEN]; |
| 313 | unsigned int qmr, qim, i; |
| 314 | int ret; |
| 315 | |
| 316 | /* Find available queues */ |
| 317 | qim = 0; |
| 318 | qmr = ioread32(ccp->io_regs + Q_MASK_REG); |
| 319 | for (i = 0; i < MAX_HW_QUEUES; i++) { |
| 320 | if (!(qmr & (1 << i))) |
| 321 | continue; |
| 322 | |
| 323 | /* Allocate a dma pool for this queue */ |
| 324 | snprintf(dma_pool_name, sizeof(dma_pool_name), "ccp_q%d", i); |
| 325 | dma_pool = dma_pool_create(dma_pool_name, dev, |
| 326 | CCP_DMAPOOL_MAX_SIZE, |
| 327 | CCP_DMAPOOL_ALIGN, 0); |
| 328 | if (!dma_pool) { |
| 329 | dev_err(dev, "unable to allocate dma pool\n"); |
| 330 | ret = -ENOMEM; |
| 331 | goto e_pool; |
| 332 | } |
| 333 | |
| 334 | cmd_q = &ccp->cmd_q[ccp->cmd_q_count]; |
| 335 | ccp->cmd_q_count++; |
| 336 | |
| 337 | cmd_q->ccp = ccp; |
| 338 | cmd_q->id = i; |
| 339 | cmd_q->dma_pool = dma_pool; |
| 340 | |
| 341 | /* Reserve 2 KSB regions for the queue */ |
| 342 | cmd_q->ksb_key = KSB_START + ccp->ksb_start++; |
| 343 | cmd_q->ksb_ctx = KSB_START + ccp->ksb_start++; |
| 344 | ccp->ksb_count -= 2; |
| 345 | |
| 346 | /* Preset some register values and masks that are queue |
| 347 | * number dependent |
| 348 | */ |
| 349 | cmd_q->reg_status = ccp->io_regs + CMD_Q_STATUS_BASE + |
| 350 | (CMD_Q_STATUS_INCR * i); |
| 351 | cmd_q->reg_int_status = ccp->io_regs + CMD_Q_INT_STATUS_BASE + |
| 352 | (CMD_Q_STATUS_INCR * i); |
| 353 | cmd_q->int_ok = 1 << (i * 2); |
| 354 | cmd_q->int_err = 1 << ((i * 2) + 1); |
| 355 | |
| 356 | cmd_q->free_slots = CMD_Q_DEPTH(ioread32(cmd_q->reg_status)); |
| 357 | |
| 358 | init_waitqueue_head(&cmd_q->int_queue); |
| 359 | |
| 360 | /* Build queue interrupt mask (two interrupts per queue) */ |
| 361 | qim |= cmd_q->int_ok | cmd_q->int_err; |
| 362 | |
| 363 | dev_dbg(dev, "queue #%u available\n", i); |
| 364 | } |
| 365 | if (ccp->cmd_q_count == 0) { |
| 366 | dev_notice(dev, "no command queues available\n"); |
| 367 | ret = -EIO; |
| 368 | goto e_pool; |
| 369 | } |
| 370 | dev_notice(dev, "%u command queues available\n", ccp->cmd_q_count); |
| 371 | |
| 372 | /* Disable and clear interrupts until ready */ |
| 373 | iowrite32(0x00, ccp->io_regs + IRQ_MASK_REG); |
| 374 | for (i = 0; i < ccp->cmd_q_count; i++) { |
| 375 | cmd_q = &ccp->cmd_q[i]; |
| 376 | |
| 377 | ioread32(cmd_q->reg_int_status); |
| 378 | ioread32(cmd_q->reg_status); |
| 379 | } |
| 380 | iowrite32(qim, ccp->io_regs + IRQ_STATUS_REG); |
| 381 | |
| 382 | /* Request an irq */ |
| 383 | ret = ccp->get_irq(ccp); |
| 384 | if (ret) { |
| 385 | dev_err(dev, "unable to allocate an IRQ\n"); |
| 386 | goto e_pool; |
| 387 | } |
| 388 | |
| 389 | /* Initialize the queues used to wait for KSB space and suspend */ |
| 390 | init_waitqueue_head(&ccp->ksb_queue); |
| 391 | init_waitqueue_head(&ccp->suspend_queue); |
| 392 | |
| 393 | /* Create a kthread for each queue */ |
| 394 | for (i = 0; i < ccp->cmd_q_count; i++) { |
| 395 | struct task_struct *kthread; |
| 396 | |
| 397 | cmd_q = &ccp->cmd_q[i]; |
| 398 | |
| 399 | kthread = kthread_create(ccp_cmd_queue_thread, cmd_q, |
| 400 | "ccp-q%u", cmd_q->id); |
| 401 | if (IS_ERR(kthread)) { |
| 402 | dev_err(dev, "error creating queue thread (%ld)\n", |
| 403 | PTR_ERR(kthread)); |
| 404 | ret = PTR_ERR(kthread); |
| 405 | goto e_kthread; |
| 406 | } |
| 407 | |
| 408 | cmd_q->kthread = kthread; |
| 409 | wake_up_process(kthread); |
| 410 | } |
| 411 | |
| 412 | /* Register the RNG */ |
| 413 | ccp->hwrng.name = "ccp-rng"; |
| 414 | ccp->hwrng.read = ccp_trng_read; |
| 415 | ret = hwrng_register(&ccp->hwrng); |
| 416 | if (ret) { |
| 417 | dev_err(dev, "error registering hwrng (%d)\n", ret); |
| 418 | goto e_kthread; |
| 419 | } |
| 420 | |
| 421 | /* Make the device struct available before enabling interrupts */ |
| 422 | ccp_add_device(ccp); |
| 423 | |
| 424 | /* Enable interrupts */ |
| 425 | iowrite32(qim, ccp->io_regs + IRQ_MASK_REG); |
| 426 | |
| 427 | return 0; |
| 428 | |
| 429 | e_kthread: |
| 430 | for (i = 0; i < ccp->cmd_q_count; i++) |
| 431 | if (ccp->cmd_q[i].kthread) |
| 432 | kthread_stop(ccp->cmd_q[i].kthread); |
| 433 | |
| 434 | ccp->free_irq(ccp); |
| 435 | |
| 436 | e_pool: |
| 437 | for (i = 0; i < ccp->cmd_q_count; i++) |
| 438 | dma_pool_destroy(ccp->cmd_q[i].dma_pool); |
| 439 | |
| 440 | return ret; |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * ccp_destroy - tear down the CCP device |
| 445 | * |
| 446 | * @ccp: ccp_device struct |
| 447 | */ |
| 448 | void ccp_destroy(struct ccp_device *ccp) |
| 449 | { |
| 450 | struct ccp_cmd_queue *cmd_q; |
| 451 | struct ccp_cmd *cmd; |
| 452 | unsigned int qim, i; |
| 453 | |
| 454 | /* Remove general access to the device struct */ |
| 455 | ccp_del_device(ccp); |
| 456 | |
| 457 | /* Unregister the RNG */ |
| 458 | hwrng_unregister(&ccp->hwrng); |
| 459 | |
| 460 | /* Stop the queue kthreads */ |
| 461 | for (i = 0; i < ccp->cmd_q_count; i++) |
| 462 | if (ccp->cmd_q[i].kthread) |
| 463 | kthread_stop(ccp->cmd_q[i].kthread); |
| 464 | |
| 465 | /* Build queue interrupt mask (two interrupt masks per queue) */ |
| 466 | qim = 0; |
| 467 | for (i = 0; i < ccp->cmd_q_count; i++) { |
| 468 | cmd_q = &ccp->cmd_q[i]; |
| 469 | qim |= cmd_q->int_ok | cmd_q->int_err; |
| 470 | } |
| 471 | |
| 472 | /* Disable and clear interrupts */ |
| 473 | iowrite32(0x00, ccp->io_regs + IRQ_MASK_REG); |
| 474 | for (i = 0; i < ccp->cmd_q_count; i++) { |
| 475 | cmd_q = &ccp->cmd_q[i]; |
| 476 | |
| 477 | ioread32(cmd_q->reg_int_status); |
| 478 | ioread32(cmd_q->reg_status); |
| 479 | } |
| 480 | iowrite32(qim, ccp->io_regs + IRQ_STATUS_REG); |
| 481 | |
| 482 | ccp->free_irq(ccp); |
| 483 | |
| 484 | for (i = 0; i < ccp->cmd_q_count; i++) |
| 485 | dma_pool_destroy(ccp->cmd_q[i].dma_pool); |
| 486 | |
| 487 | /* Flush the cmd and backlog queue */ |
| 488 | while (!list_empty(&ccp->cmd)) { |
| 489 | /* Invoke the callback directly with an error code */ |
| 490 | cmd = list_first_entry(&ccp->cmd, struct ccp_cmd, entry); |
| 491 | list_del(&cmd->entry); |
| 492 | cmd->callback(cmd->data, -ENODEV); |
| 493 | } |
| 494 | while (!list_empty(&ccp->backlog)) { |
| 495 | /* Invoke the callback directly with an error code */ |
| 496 | cmd = list_first_entry(&ccp->backlog, struct ccp_cmd, entry); |
| 497 | list_del(&cmd->entry); |
| 498 | cmd->callback(cmd->data, -ENODEV); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | /** |
| 503 | * ccp_irq_handler - handle interrupts generated by the CCP device |
| 504 | * |
| 505 | * @irq: the irq associated with the interrupt |
| 506 | * @data: the data value supplied when the irq was created |
| 507 | */ |
| 508 | irqreturn_t ccp_irq_handler(int irq, void *data) |
| 509 | { |
| 510 | struct device *dev = data; |
| 511 | struct ccp_device *ccp = dev_get_drvdata(dev); |
| 512 | struct ccp_cmd_queue *cmd_q; |
| 513 | u32 q_int, status; |
| 514 | unsigned int i; |
| 515 | |
| 516 | status = ioread32(ccp->io_regs + IRQ_STATUS_REG); |
| 517 | |
| 518 | for (i = 0; i < ccp->cmd_q_count; i++) { |
| 519 | cmd_q = &ccp->cmd_q[i]; |
| 520 | |
| 521 | q_int = status & (cmd_q->int_ok | cmd_q->int_err); |
| 522 | if (q_int) { |
| 523 | cmd_q->int_status = status; |
| 524 | cmd_q->q_status = ioread32(cmd_q->reg_status); |
| 525 | cmd_q->q_int_status = ioread32(cmd_q->reg_int_status); |
| 526 | |
| 527 | /* On error, only save the first error value */ |
| 528 | if ((q_int & cmd_q->int_err) && !cmd_q->cmd_error) |
| 529 | cmd_q->cmd_error = CMD_Q_ERROR(cmd_q->q_status); |
| 530 | |
| 531 | cmd_q->int_rcvd = 1; |
| 532 | |
| 533 | /* Acknowledge the interrupt and wake the kthread */ |
| 534 | iowrite32(q_int, ccp->io_regs + IRQ_STATUS_REG); |
| 535 | wake_up_interruptible(&cmd_q->int_queue); |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | return IRQ_HANDLED; |
| 540 | } |
| 541 | |
| 542 | #ifdef CONFIG_PM |
| 543 | bool ccp_queues_suspended(struct ccp_device *ccp) |
| 544 | { |
| 545 | unsigned int suspended = 0; |
| 546 | unsigned long flags; |
| 547 | unsigned int i; |
| 548 | |
| 549 | spin_lock_irqsave(&ccp->cmd_lock, flags); |
| 550 | |
| 551 | for (i = 0; i < ccp->cmd_q_count; i++) |
| 552 | if (ccp->cmd_q[i].suspended) |
| 553 | suspended++; |
| 554 | |
| 555 | spin_unlock_irqrestore(&ccp->cmd_lock, flags); |
| 556 | |
| 557 | return ccp->cmd_q_count == suspended; |
| 558 | } |
| 559 | #endif |
| 560 | |
| 561 | static const struct x86_cpu_id ccp_support[] = { |
| 562 | { X86_VENDOR_AMD, 22, }, |
| 563 | }; |
| 564 | |
| 565 | static int __init ccp_mod_init(void) |
| 566 | { |
| 567 | struct cpuinfo_x86 *cpuinfo = &boot_cpu_data; |
Tom Lendacky | db34cf9 | 2014-01-06 13:34:29 -0600 | [diff] [blame] | 568 | int ret; |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 569 | |
| 570 | if (!x86_match_cpu(ccp_support)) |
| 571 | return -ENODEV; |
| 572 | |
| 573 | switch (cpuinfo->x86) { |
| 574 | case 22: |
| 575 | if ((cpuinfo->x86_model < 48) || (cpuinfo->x86_model > 63)) |
| 576 | return -ENODEV; |
Tom Lendacky | db34cf9 | 2014-01-06 13:34:29 -0600 | [diff] [blame] | 577 | |
| 578 | ret = ccp_pci_init(); |
| 579 | if (ret) |
| 580 | return ret; |
| 581 | |
| 582 | /* Don't leave the driver loaded if init failed */ |
| 583 | if (!ccp_get_device()) { |
| 584 | ccp_pci_exit(); |
| 585 | return -ENODEV; |
| 586 | } |
| 587 | |
| 588 | return 0; |
| 589 | |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 590 | break; |
Fengguang Wu | d1dd206 | 2013-12-09 20:08:19 +0800 | [diff] [blame] | 591 | } |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 592 | |
| 593 | return -ENODEV; |
| 594 | } |
| 595 | |
| 596 | static void __exit ccp_mod_exit(void) |
| 597 | { |
| 598 | struct cpuinfo_x86 *cpuinfo = &boot_cpu_data; |
| 599 | |
| 600 | switch (cpuinfo->x86) { |
| 601 | case 22: |
| 602 | ccp_pci_exit(); |
| 603 | break; |
Fengguang Wu | d1dd206 | 2013-12-09 20:08:19 +0800 | [diff] [blame] | 604 | } |
Tom Lendacky | 63b9450 | 2013-11-12 11:46:16 -0600 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | module_init(ccp_mod_init); |
| 608 | module_exit(ccp_mod_exit); |