1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for the HP iLO management processor. 4 * 5 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P. 6 * David Altobelli <david.altobelli@hpe.com> 7 */ 8 #include <linux/kernel.h> 9 #include <linux/types.h> 10 #include <linux/module.h> 11 #include <linux/fs.h> 12 #include <linux/pci.h> 13 #include <linux/interrupt.h> 14 #include <linux/ioport.h> 15 #include <linux/device.h> 16 #include <linux/file.h> 17 #include <linux/cdev.h> 18 #include <linux/sched.h> 19 #include <linux/spinlock.h> 20 #include <linux/delay.h> 21 #include <linux/uaccess.h> 22 #include <linux/io.h> 23 #include <linux/wait.h> 24 #include <linux/poll.h> 25 #include <linux/slab.h> 26 #include "hpilo.h" 27 28 static struct class *ilo_class; 29 static unsigned int ilo_major; 30 static unsigned int max_ccb = 16; 31 static char ilo_hwdev[MAX_ILO_DEV]; 32 static const struct pci_device_id ilo_blacklist[] = { 33 /* auxiliary iLO */ 34 {PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3307, PCI_VENDOR_ID_HP, 0x1979)}, 35 /* CL */ 36 {PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3307, PCI_VENDOR_ID_HP_3PAR, 0x0289)}, 37 {} 38 }; 39 40 static inline int get_entry_id(int entry) 41 { 42 return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR; 43 } 44 45 static inline int get_entry_len(int entry) 46 { 47 return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3; 48 } 49 50 static inline int mk_entry(int id, int len) 51 { 52 int qlen = len & 7 ? (len >> 3) + 1 : len >> 3; 53 return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS; 54 } 55 56 static inline int desc_mem_sz(int nr_entry) 57 { 58 return nr_entry << L2_QENTRY_SZ; 59 } 60 61 /* 62 * FIFO queues, shared with hardware. 63 * 64 * If a queue has empty slots, an entry is added to the queue tail, 65 * and that entry is marked as occupied. 66 * Entries can be dequeued from the head of the list, when the device 67 * has marked the entry as consumed. 68 * 69 * Returns true on successful queue/dequeue, false on failure. 70 */ 71 static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry) 72 { 73 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); 74 unsigned long flags; 75 int ret = 0; 76 77 spin_lock_irqsave(&hw->fifo_lock, flags); 78 if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask] 79 & ENTRY_MASK_O)) { 80 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |= 81 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge; 82 fifo_q->tail += 1; 83 ret = 1; 84 } 85 spin_unlock_irqrestore(&hw->fifo_lock, flags); 86 87 return ret; 88 } 89 90 static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry) 91 { 92 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); 93 unsigned long flags; 94 int ret = 0; 95 u64 c; 96 97 spin_lock_irqsave(&hw->fifo_lock, flags); 98 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; 99 if (c & ENTRY_MASK_C) { 100 if (entry) 101 *entry = c & ENTRY_MASK_NOSTATE; 102 103 fifo_q->fifobar[fifo_q->head & fifo_q->imask] = 104 (c | ENTRY_MASK) + 1; 105 fifo_q->head += 1; 106 ret = 1; 107 } 108 spin_unlock_irqrestore(&hw->fifo_lock, flags); 109 110 return ret; 111 } 112 113 static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar) 114 { 115 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); 116 unsigned long flags; 117 int ret = 0; 118 u64 c; 119 120 spin_lock_irqsave(&hw->fifo_lock, flags); 121 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; 122 if (c & ENTRY_MASK_C) 123 ret = 1; 124 spin_unlock_irqrestore(&hw->fifo_lock, flags); 125 126 return ret; 127 } 128 129 static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb, 130 int dir, int id, int len) 131 { 132 char *fifobar; 133 int entry; 134 135 if (dir == SENDQ) 136 fifobar = ccb->ccb_u1.send_fifobar; 137 else 138 fifobar = ccb->ccb_u3.recv_fifobar; 139 140 entry = mk_entry(id, len); 141 return fifo_enqueue(hw, fifobar, entry); 142 } 143 144 static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb, 145 int dir, int *id, int *len, void **pkt) 146 { 147 char *fifobar, *desc; 148 int entry = 0, pkt_id = 0; 149 int ret; 150 151 if (dir == SENDQ) { 152 fifobar = ccb->ccb_u1.send_fifobar; 153 desc = ccb->ccb_u2.send_desc; 154 } else { 155 fifobar = ccb->ccb_u3.recv_fifobar; 156 desc = ccb->ccb_u4.recv_desc; 157 } 158 159 ret = fifo_dequeue(hw, fifobar, &entry); 160 if (ret) { 161 pkt_id = get_entry_id(entry); 162 if (id) 163 *id = pkt_id; 164 if (len) 165 *len = get_entry_len(entry); 166 if (pkt) 167 *pkt = (void *)(desc + desc_mem_sz(pkt_id)); 168 } 169 170 return ret; 171 } 172 173 static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb) 174 { 175 char *fifobar = ccb->ccb_u3.recv_fifobar; 176 177 return fifo_check_recv(hw, fifobar); 178 } 179 180 static inline void doorbell_set(struct ccb *ccb) 181 { 182 iowrite8(1, ccb->ccb_u5.db_base); 183 } 184 185 static inline void doorbell_clr(struct ccb *ccb) 186 { 187 iowrite8(2, ccb->ccb_u5.db_base); 188 } 189 190 static inline int ctrl_set(int l2sz, int idxmask, int desclim) 191 { 192 int active = 0, go = 1; 193 return l2sz << CTRL_BITPOS_L2SZ | 194 idxmask << CTRL_BITPOS_FIFOINDEXMASK | 195 desclim << CTRL_BITPOS_DESCLIMIT | 196 active << CTRL_BITPOS_A | 197 go << CTRL_BITPOS_G; 198 } 199 200 static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz) 201 { 202 /* for simplicity, use the same parameters for send and recv ctrls */ 203 ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); 204 ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); 205 } 206 207 static inline int fifo_sz(int nr_entry) 208 { 209 /* size of a fifo is determined by the number of entries it contains */ 210 return nr_entry * sizeof(u64) + FIFOHANDLESIZE; 211 } 212 213 static void fifo_setup(void *base_addr, int nr_entry) 214 { 215 struct fifo *fifo_q = base_addr; 216 int i; 217 218 /* set up an empty fifo */ 219 fifo_q->head = 0; 220 fifo_q->tail = 0; 221 fifo_q->reset = 0; 222 fifo_q->nrents = nr_entry; 223 fifo_q->imask = nr_entry - 1; 224 fifo_q->merge = ENTRY_MASK_O; 225 226 for (i = 0; i < nr_entry; i++) 227 fifo_q->fifobar[i] = 0; 228 } 229 230 static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data) 231 { 232 struct ccb *driver_ccb = &data->driver_ccb; 233 struct ccb __iomem *device_ccb = data->mapped_ccb; 234 int retries; 235 236 /* complicated dance to tell the hw we are stopping */ 237 doorbell_clr(driver_ccb); 238 iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G), 239 &device_ccb->send_ctrl); 240 iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G), 241 &device_ccb->recv_ctrl); 242 243 /* give iLO some time to process stop request */ 244 for (retries = MAX_WAIT; retries > 0; retries--) { 245 doorbell_set(driver_ccb); 246 udelay(WAIT_TIME); 247 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A)) 248 && 249 !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A))) 250 break; 251 } 252 if (retries == 0) 253 dev_err(&pdev->dev, "Closing, but controller still active\n"); 254 255 /* clear the hw ccb */ 256 memset_io(device_ccb, 0, sizeof(struct ccb)); 257 258 /* free resources used to back send/recv queues */ 259 dma_free_coherent(&pdev->dev, data->dma_size, data->dma_va, 260 data->dma_pa); 261 } 262 263 static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) 264 { 265 char *dma_va; 266 dma_addr_t dma_pa; 267 struct ccb *driver_ccb, *ilo_ccb; 268 269 driver_ccb = &data->driver_ccb; 270 ilo_ccb = &data->ilo_ccb; 271 272 data->dma_size = 2 * fifo_sz(NR_QENTRY) + 273 2 * desc_mem_sz(NR_QENTRY) + 274 ILO_START_ALIGN + ILO_CACHE_SZ; 275 276 data->dma_va = dma_alloc_coherent(&hw->ilo_dev->dev, data->dma_size, 277 &data->dma_pa, GFP_ATOMIC); 278 if (!data->dma_va) 279 return -ENOMEM; 280 281 dma_va = (char *)data->dma_va; 282 dma_pa = data->dma_pa; 283 284 dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN); 285 dma_pa = roundup(dma_pa, ILO_START_ALIGN); 286 287 /* 288 * Create two ccb's, one with virt addrs, one with phys addrs. 289 * Copy the phys addr ccb to device shared mem. 290 */ 291 ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ); 292 ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ); 293 294 fifo_setup(dma_va, NR_QENTRY); 295 driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE; 296 ilo_ccb->ccb_u1.send_fifobar_pa = dma_pa + FIFOHANDLESIZE; 297 dma_va += fifo_sz(NR_QENTRY); 298 dma_pa += fifo_sz(NR_QENTRY); 299 300 dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ); 301 dma_pa = roundup(dma_pa, ILO_CACHE_SZ); 302 303 fifo_setup(dma_va, NR_QENTRY); 304 driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE; 305 ilo_ccb->ccb_u3.recv_fifobar_pa = dma_pa + FIFOHANDLESIZE; 306 dma_va += fifo_sz(NR_QENTRY); 307 dma_pa += fifo_sz(NR_QENTRY); 308 309 driver_ccb->ccb_u2.send_desc = dma_va; 310 ilo_ccb->ccb_u2.send_desc_pa = dma_pa; 311 dma_pa += desc_mem_sz(NR_QENTRY); 312 dma_va += desc_mem_sz(NR_QENTRY); 313 314 driver_ccb->ccb_u4.recv_desc = dma_va; 315 ilo_ccb->ccb_u4.recv_desc_pa = dma_pa; 316 317 driver_ccb->channel = slot; 318 ilo_ccb->channel = slot; 319 320 driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE); 321 ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */ 322 323 return 0; 324 } 325 326 static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) 327 { 328 int pkt_id, pkt_sz; 329 struct ccb *driver_ccb = &data->driver_ccb; 330 331 /* copy the ccb with physical addrs to device memory */ 332 data->mapped_ccb = (struct ccb __iomem *) 333 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ)); 334 memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb)); 335 336 /* put packets on the send and receive queues */ 337 pkt_sz = 0; 338 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) { 339 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz); 340 doorbell_set(driver_ccb); 341 } 342 343 pkt_sz = desc_mem_sz(1); 344 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) 345 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz); 346 347 /* the ccb is ready to use */ 348 doorbell_clr(driver_ccb); 349 } 350 351 static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data) 352 { 353 int pkt_id, i; 354 struct ccb *driver_ccb = &data->driver_ccb; 355 356 /* make sure iLO is really handling requests */ 357 for (i = MAX_WAIT; i > 0; i--) { 358 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL)) 359 break; 360 udelay(WAIT_TIME); 361 } 362 363 if (i == 0) { 364 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n"); 365 return -EBUSY; 366 } 367 368 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); 369 doorbell_set(driver_ccb); 370 return 0; 371 } 372 373 static inline int is_channel_reset(struct ccb *ccb) 374 { 375 /* check for this particular channel needing a reset */ 376 return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset; 377 } 378 379 static inline void set_channel_reset(struct ccb *ccb) 380 { 381 /* set a flag indicating this channel needs a reset */ 382 FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1; 383 } 384 385 static inline int get_device_outbound(struct ilo_hwinfo *hw) 386 { 387 return ioread32(&hw->mmio_vaddr[DB_OUT]); 388 } 389 390 static inline int is_db_reset(int db_out) 391 { 392 return db_out & (1 << DB_RESET); 393 } 394 395 static inline int is_device_reset(struct ilo_hwinfo *hw) 396 { 397 /* check for global reset condition */ 398 return is_db_reset(get_device_outbound(hw)); 399 } 400 401 static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr) 402 { 403 iowrite32(clr, &hw->mmio_vaddr[DB_OUT]); 404 } 405 406 static inline void clear_device(struct ilo_hwinfo *hw) 407 { 408 /* clear the device (reset bits, pending channel entries) */ 409 clear_pending_db(hw, -1); 410 } 411 412 static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw) 413 { 414 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]); 415 } 416 417 static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw) 418 { 419 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1, 420 &hw->mmio_vaddr[DB_IRQ]); 421 } 422 423 static void ilo_set_reset(struct ilo_hwinfo *hw) 424 { 425 int slot; 426 427 /* 428 * Mapped memory is zeroed on ilo reset, so set a per ccb flag 429 * to indicate that this ccb needs to be closed and reopened. 430 */ 431 for (slot = 0; slot < max_ccb; slot++) { 432 if (!hw->ccb_alloc[slot]) 433 continue; 434 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb); 435 } 436 } 437 438 static ssize_t ilo_read(struct file *fp, char __user *buf, 439 size_t len, loff_t *off) 440 { 441 int err, found, cnt, pkt_id, pkt_len; 442 struct ccb_data *data = fp->private_data; 443 struct ccb *driver_ccb = &data->driver_ccb; 444 struct ilo_hwinfo *hw = data->ilo_hw; 445 void *pkt; 446 447 if (is_channel_reset(driver_ccb)) { 448 /* 449 * If the device has been reset, applications 450 * need to close and reopen all ccbs. 451 */ 452 return -ENODEV; 453 } 454 455 /* 456 * This function is to be called when data is expected 457 * in the channel, and will return an error if no packet is found 458 * during the loop below. The sleep/retry logic is to allow 459 * applications to call read() immediately post write(), 460 * and give iLO some time to process the sent packet. 461 */ 462 cnt = 20; 463 do { 464 /* look for a received packet */ 465 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id, 466 &pkt_len, &pkt); 467 if (found) 468 break; 469 cnt--; 470 msleep(100); 471 } while (!found && cnt); 472 473 if (!found) 474 return -EAGAIN; 475 476 /* only copy the length of the received packet */ 477 if (pkt_len < len) 478 len = pkt_len; 479 480 err = copy_to_user(buf, pkt, len); 481 482 /* return the received packet to the queue */ 483 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1)); 484 485 return err ? -EFAULT : len; 486 } 487 488 static ssize_t ilo_write(struct file *fp, const char __user *buf, 489 size_t len, loff_t *off) 490 { 491 int err, pkt_id, pkt_len; 492 struct ccb_data *data = fp->private_data; 493 struct ccb *driver_ccb = &data->driver_ccb; 494 struct ilo_hwinfo *hw = data->ilo_hw; 495 void *pkt; 496 497 if (is_channel_reset(driver_ccb)) 498 return -ENODEV; 499 500 /* get a packet to send the user command */ 501 if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt)) 502 return -EBUSY; 503 504 /* limit the length to the length of the packet */ 505 if (pkt_len < len) 506 len = pkt_len; 507 508 /* on failure, set the len to 0 to return empty packet to the device */ 509 err = copy_from_user(pkt, buf, len); 510 if (err) 511 len = 0; 512 513 /* send the packet */ 514 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len); 515 doorbell_set(driver_ccb); 516 517 return err ? -EFAULT : len; 518 } 519 520 static __poll_t ilo_poll(struct file *fp, poll_table *wait) 521 { 522 struct ccb_data *data = fp->private_data; 523 struct ccb *driver_ccb = &data->driver_ccb; 524 525 poll_wait(fp, &data->ccb_waitq, wait); 526 527 if (is_channel_reset(driver_ccb)) 528 return EPOLLERR; 529 else if (ilo_pkt_recv(data->ilo_hw, driver_ccb)) 530 return EPOLLIN | EPOLLRDNORM; 531 532 return 0; 533 } 534 535 static int ilo_close(struct inode *ip, struct file *fp) 536 { 537 int slot; 538 struct ccb_data *data; 539 struct ilo_hwinfo *hw; 540 unsigned long flags; 541 542 slot = iminor(ip) % max_ccb; 543 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); 544 545 spin_lock(&hw->open_lock); 546 547 if (hw->ccb_alloc[slot]->ccb_cnt == 1) { 548 549 data = fp->private_data; 550 551 spin_lock_irqsave(&hw->alloc_lock, flags); 552 hw->ccb_alloc[slot] = NULL; 553 spin_unlock_irqrestore(&hw->alloc_lock, flags); 554 555 ilo_ccb_close(hw->ilo_dev, data); 556 557 kfree(data); 558 } else 559 hw->ccb_alloc[slot]->ccb_cnt--; 560 561 spin_unlock(&hw->open_lock); 562 563 return 0; 564 } 565 566 static int ilo_open(struct inode *ip, struct file *fp) 567 { 568 int slot, error; 569 struct ccb_data *data; 570 struct ilo_hwinfo *hw; 571 unsigned long flags; 572 573 slot = iminor(ip) % max_ccb; 574 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); 575 576 /* new ccb allocation */ 577 data = kzalloc(sizeof(*data), GFP_KERNEL); 578 if (!data) 579 return -ENOMEM; 580 581 spin_lock(&hw->open_lock); 582 583 /* each fd private_data holds sw/hw view of ccb */ 584 if (hw->ccb_alloc[slot] == NULL) { 585 /* create a channel control block for this minor */ 586 error = ilo_ccb_setup(hw, data, slot); 587 if (error) { 588 kfree(data); 589 goto out; 590 } 591 592 data->ccb_cnt = 1; 593 data->ccb_excl = fp->f_flags & O_EXCL; 594 data->ilo_hw = hw; 595 init_waitqueue_head(&data->ccb_waitq); 596 597 /* write the ccb to hw */ 598 spin_lock_irqsave(&hw->alloc_lock, flags); 599 ilo_ccb_open(hw, data, slot); 600 hw->ccb_alloc[slot] = data; 601 spin_unlock_irqrestore(&hw->alloc_lock, flags); 602 603 /* make sure the channel is functional */ 604 error = ilo_ccb_verify(hw, data); 605 if (error) { 606 607 spin_lock_irqsave(&hw->alloc_lock, flags); 608 hw->ccb_alloc[slot] = NULL; 609 spin_unlock_irqrestore(&hw->alloc_lock, flags); 610 611 ilo_ccb_close(hw->ilo_dev, data); 612 613 kfree(data); 614 goto out; 615 } 616 617 } else { 618 kfree(data); 619 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) { 620 /* 621 * The channel exists, and either this open 622 * or a previous open of this channel wants 623 * exclusive access. 624 */ 625 error = -EBUSY; 626 } else { 627 hw->ccb_alloc[slot]->ccb_cnt++; 628 error = 0; 629 } 630 } 631 out: 632 spin_unlock(&hw->open_lock); 633 634 if (!error) 635 fp->private_data = hw->ccb_alloc[slot]; 636 637 return error; 638 } 639 640 static const struct file_operations ilo_fops = { 641 .owner = THIS_MODULE, 642 .read = ilo_read, 643 .write = ilo_write, 644 .poll = ilo_poll, 645 .open = ilo_open, 646 .release = ilo_close, 647 .llseek = noop_llseek, 648 }; 649 650 static irqreturn_t ilo_isr(int irq, void *data) 651 { 652 struct ilo_hwinfo *hw = data; 653 int pending, i; 654 655 spin_lock(&hw->alloc_lock); 656 657 /* check for ccbs which have data */ 658 pending = get_device_outbound(hw); 659 if (!pending) { 660 spin_unlock(&hw->alloc_lock); 661 return IRQ_NONE; 662 } 663 664 if (is_db_reset(pending)) { 665 /* wake up all ccbs if the device was reset */ 666 pending = -1; 667 ilo_set_reset(hw); 668 } 669 670 for (i = 0; i < max_ccb; i++) { 671 if (!hw->ccb_alloc[i]) 672 continue; 673 if (pending & (1 << i)) 674 wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq); 675 } 676 677 /* clear the device of the channels that have been handled */ 678 clear_pending_db(hw, pending); 679 680 spin_unlock(&hw->alloc_lock); 681 682 return IRQ_HANDLED; 683 } 684 685 static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) 686 { 687 pci_iounmap(pdev, hw->db_vaddr); 688 pci_iounmap(pdev, hw->ram_vaddr); 689 pci_iounmap(pdev, hw->mmio_vaddr); 690 } 691 692 static int ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) 693 { 694 int bar; 695 unsigned long off; 696 u8 pci_rev_id; 697 int rc; 698 699 /* map the memory mapped i/o registers */ 700 hw->mmio_vaddr = pci_iomap(pdev, 1, 0); 701 if (hw->mmio_vaddr == NULL) { 702 dev_err(&pdev->dev, "Error mapping mmio\n"); 703 goto out; 704 } 705 706 /* map the adapter shared memory region */ 707 rc = pci_read_config_byte(pdev, PCI_REVISION_ID, &pci_rev_id); 708 if (rc != 0) { 709 dev_err(&pdev->dev, "Error reading PCI rev id: %d\n", rc); 710 goto out; 711 } 712 713 if (pci_rev_id >= PCI_REV_ID_NECHES) { 714 bar = 5; 715 /* Last 8k is reserved for CCBs */ 716 off = pci_resource_len(pdev, bar) - 0x2000; 717 } else { 718 bar = 2; 719 off = 0; 720 } 721 hw->ram_vaddr = pci_iomap_range(pdev, bar, off, max_ccb * ILOHW_CCB_SZ); 722 if (hw->ram_vaddr == NULL) { 723 dev_err(&pdev->dev, "Error mapping shared mem\n"); 724 goto mmio_free; 725 } 726 727 /* map the doorbell aperture */ 728 hw->db_vaddr = pci_iomap(pdev, 3, max_ccb * ONE_DB_SIZE); 729 if (hw->db_vaddr == NULL) { 730 dev_err(&pdev->dev, "Error mapping doorbell\n"); 731 goto ram_free; 732 } 733 734 return 0; 735 ram_free: 736 pci_iounmap(pdev, hw->ram_vaddr); 737 mmio_free: 738 pci_iounmap(pdev, hw->mmio_vaddr); 739 out: 740 return -ENOMEM; 741 } 742 743 static void ilo_remove(struct pci_dev *pdev) 744 { 745 int i, minor; 746 struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev); 747 748 if (!ilo_hw) 749 return; 750 751 clear_device(ilo_hw); 752 753 minor = MINOR(ilo_hw->cdev.dev); 754 for (i = minor; i < minor + max_ccb; i++) 755 device_destroy(ilo_class, MKDEV(ilo_major, i)); 756 757 cdev_del(&ilo_hw->cdev); 758 ilo_disable_interrupts(ilo_hw); 759 free_irq(pdev->irq, ilo_hw); 760 ilo_unmap_device(pdev, ilo_hw); 761 pci_release_regions(pdev); 762 /* 763 * pci_disable_device(pdev) used to be here. But this PCI device has 764 * two functions with interrupt lines connected to a single pin. The 765 * other one is a USB host controller. So when we disable the PIN here 766 * e.g. by rmmod hpilo, the controller stops working. It is because 767 * the interrupt link is disabled in ACPI since it is not refcounted 768 * yet. See acpi_pci_link_free_irq called from acpi_pci_irq_disable. 769 */ 770 kfree(ilo_hw); 771 ilo_hwdev[(minor / max_ccb)] = 0; 772 } 773 774 static int ilo_probe(struct pci_dev *pdev, 775 const struct pci_device_id *ent) 776 { 777 int devnum, minor, start, error = 0; 778 struct ilo_hwinfo *ilo_hw; 779 780 if (pci_match_id(ilo_blacklist, pdev)) { 781 dev_dbg(&pdev->dev, "Not supported on this device\n"); 782 return -ENODEV; 783 } 784 785 if (max_ccb > MAX_CCB) 786 max_ccb = MAX_CCB; 787 else if (max_ccb < MIN_CCB) 788 max_ccb = MIN_CCB; 789 790 /* find a free range for device files */ 791 for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) { 792 if (ilo_hwdev[devnum] == 0) { 793 ilo_hwdev[devnum] = 1; 794 break; 795 } 796 } 797 798 if (devnum == MAX_ILO_DEV) { 799 dev_err(&pdev->dev, "Error finding free device\n"); 800 return -ENODEV; 801 } 802 803 /* track global allocations for this device */ 804 error = -ENOMEM; 805 ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL); 806 if (!ilo_hw) 807 goto out; 808 809 ilo_hw->ilo_dev = pdev; 810 spin_lock_init(&ilo_hw->alloc_lock); 811 spin_lock_init(&ilo_hw->fifo_lock); 812 spin_lock_init(&ilo_hw->open_lock); 813 814 error = pci_enable_device(pdev); 815 if (error) 816 goto free; 817 818 pci_set_master(pdev); 819 820 error = pci_request_regions(pdev, ILO_NAME); 821 if (error) 822 goto disable; 823 824 error = ilo_map_device(pdev, ilo_hw); 825 if (error) 826 goto free_regions; 827 828 pci_set_drvdata(pdev, ilo_hw); 829 clear_device(ilo_hw); 830 831 error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw); 832 if (error) 833 goto unmap; 834 835 ilo_enable_interrupts(ilo_hw); 836 837 cdev_init(&ilo_hw->cdev, &ilo_fops); 838 ilo_hw->cdev.owner = THIS_MODULE; 839 start = devnum * max_ccb; 840 error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), max_ccb); 841 if (error) { 842 dev_err(&pdev->dev, "Could not add cdev\n"); 843 goto remove_isr; 844 } 845 846 for (minor = 0 ; minor < max_ccb; minor++) { 847 struct device *dev; 848 dev = device_create(ilo_class, &pdev->dev, 849 MKDEV(ilo_major, minor), NULL, 850 "hpilo!d%dccb%d", devnum, minor); 851 if (IS_ERR(dev)) 852 dev_err(&pdev->dev, "Could not create files\n"); 853 } 854 855 return 0; 856 remove_isr: 857 ilo_disable_interrupts(ilo_hw); 858 free_irq(pdev->irq, ilo_hw); 859 unmap: 860 ilo_unmap_device(pdev, ilo_hw); 861 free_regions: 862 pci_release_regions(pdev); 863 disable: 864 /* pci_disable_device(pdev); see comment in ilo_remove */ 865 free: 866 kfree(ilo_hw); 867 out: 868 ilo_hwdev[devnum] = 0; 869 return error; 870 } 871 872 static const struct pci_device_id ilo_devices[] = { 873 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) }, 874 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) }, 875 { } 876 }; 877 MODULE_DEVICE_TABLE(pci, ilo_devices); 878 879 static struct pci_driver ilo_driver = { 880 .name = ILO_NAME, 881 .id_table = ilo_devices, 882 .probe = ilo_probe, 883 .remove = ilo_remove, 884 }; 885 886 static int __init ilo_init(void) 887 { 888 int error; 889 dev_t dev; 890 891 ilo_class = class_create(THIS_MODULE, "iLO"); 892 if (IS_ERR(ilo_class)) { 893 error = PTR_ERR(ilo_class); 894 goto out; 895 } 896 897 error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME); 898 if (error) 899 goto class_destroy; 900 901 ilo_major = MAJOR(dev); 902 903 error = pci_register_driver(&ilo_driver); 904 if (error) 905 goto chr_remove; 906 907 return 0; 908 chr_remove: 909 unregister_chrdev_region(dev, MAX_OPEN); 910 class_destroy: 911 class_destroy(ilo_class); 912 out: 913 return error; 914 } 915 916 static void __exit ilo_exit(void) 917 { 918 pci_unregister_driver(&ilo_driver); 919 unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN); 920 class_destroy(ilo_class); 921 } 922 923 MODULE_VERSION("1.5.0"); 924 MODULE_ALIAS(ILO_NAME); 925 MODULE_DESCRIPTION(ILO_NAME); 926 MODULE_AUTHOR("David Altobelli <david.altobelli@hpe.com>"); 927 MODULE_LICENSE("GPL v2"); 928 929 module_param(max_ccb, uint, 0444); 930 MODULE_PARM_DESC(max_ccb, "Maximum number of HP iLO channels to attach (8-24)(default=16)"); 931 932 module_init(ilo_init); 933 module_exit(ilo_exit); 934