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 pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa); 260 } 261 262 static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) 263 { 264 char *dma_va; 265 dma_addr_t dma_pa; 266 struct ccb *driver_ccb, *ilo_ccb; 267 268 driver_ccb = &data->driver_ccb; 269 ilo_ccb = &data->ilo_ccb; 270 271 data->dma_size = 2 * fifo_sz(NR_QENTRY) + 272 2 * desc_mem_sz(NR_QENTRY) + 273 ILO_START_ALIGN + ILO_CACHE_SZ; 274 275 data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size, 276 &data->dma_pa); 277 if (!data->dma_va) 278 return -ENOMEM; 279 280 dma_va = (char *)data->dma_va; 281 dma_pa = data->dma_pa; 282 283 memset(dma_va, 0, data->dma_size); 284 285 dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN); 286 dma_pa = roundup(dma_pa, ILO_START_ALIGN); 287 288 /* 289 * Create two ccb's, one with virt addrs, one with phys addrs. 290 * Copy the phys addr ccb to device shared mem. 291 */ 292 ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ); 293 ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ); 294 295 fifo_setup(dma_va, NR_QENTRY); 296 driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE; 297 ilo_ccb->ccb_u1.send_fifobar_pa = dma_pa + FIFOHANDLESIZE; 298 dma_va += fifo_sz(NR_QENTRY); 299 dma_pa += fifo_sz(NR_QENTRY); 300 301 dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ); 302 dma_pa = roundup(dma_pa, ILO_CACHE_SZ); 303 304 fifo_setup(dma_va, NR_QENTRY); 305 driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE; 306 ilo_ccb->ccb_u3.recv_fifobar_pa = dma_pa + FIFOHANDLESIZE; 307 dma_va += fifo_sz(NR_QENTRY); 308 dma_pa += fifo_sz(NR_QENTRY); 309 310 driver_ccb->ccb_u2.send_desc = dma_va; 311 ilo_ccb->ccb_u2.send_desc_pa = dma_pa; 312 dma_pa += desc_mem_sz(NR_QENTRY); 313 dma_va += desc_mem_sz(NR_QENTRY); 314 315 driver_ccb->ccb_u4.recv_desc = dma_va; 316 ilo_ccb->ccb_u4.recv_desc_pa = dma_pa; 317 318 driver_ccb->channel = slot; 319 ilo_ccb->channel = slot; 320 321 driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE); 322 ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */ 323 324 return 0; 325 } 326 327 static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) 328 { 329 int pkt_id, pkt_sz; 330 struct ccb *driver_ccb = &data->driver_ccb; 331 332 /* copy the ccb with physical addrs to device memory */ 333 data->mapped_ccb = (struct ccb __iomem *) 334 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ)); 335 memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb)); 336 337 /* put packets on the send and receive queues */ 338 pkt_sz = 0; 339 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) { 340 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz); 341 doorbell_set(driver_ccb); 342 } 343 344 pkt_sz = desc_mem_sz(1); 345 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) 346 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz); 347 348 /* the ccb is ready to use */ 349 doorbell_clr(driver_ccb); 350 } 351 352 static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data) 353 { 354 int pkt_id, i; 355 struct ccb *driver_ccb = &data->driver_ccb; 356 357 /* make sure iLO is really handling requests */ 358 for (i = MAX_WAIT; i > 0; i--) { 359 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL)) 360 break; 361 udelay(WAIT_TIME); 362 } 363 364 if (i == 0) { 365 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n"); 366 return -EBUSY; 367 } 368 369 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); 370 doorbell_set(driver_ccb); 371 return 0; 372 } 373 374 static inline int is_channel_reset(struct ccb *ccb) 375 { 376 /* check for this particular channel needing a reset */ 377 return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset; 378 } 379 380 static inline void set_channel_reset(struct ccb *ccb) 381 { 382 /* set a flag indicating this channel needs a reset */ 383 FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1; 384 } 385 386 static inline int get_device_outbound(struct ilo_hwinfo *hw) 387 { 388 return ioread32(&hw->mmio_vaddr[DB_OUT]); 389 } 390 391 static inline int is_db_reset(int db_out) 392 { 393 return db_out & (1 << DB_RESET); 394 } 395 396 static inline int is_device_reset(struct ilo_hwinfo *hw) 397 { 398 /* check for global reset condition */ 399 return is_db_reset(get_device_outbound(hw)); 400 } 401 402 static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr) 403 { 404 iowrite32(clr, &hw->mmio_vaddr[DB_OUT]); 405 } 406 407 static inline void clear_device(struct ilo_hwinfo *hw) 408 { 409 /* clear the device (reset bits, pending channel entries) */ 410 clear_pending_db(hw, -1); 411 } 412 413 static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw) 414 { 415 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]); 416 } 417 418 static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw) 419 { 420 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1, 421 &hw->mmio_vaddr[DB_IRQ]); 422 } 423 424 static void ilo_set_reset(struct ilo_hwinfo *hw) 425 { 426 int slot; 427 428 /* 429 * Mapped memory is zeroed on ilo reset, so set a per ccb flag 430 * to indicate that this ccb needs to be closed and reopened. 431 */ 432 for (slot = 0; slot < max_ccb; slot++) { 433 if (!hw->ccb_alloc[slot]) 434 continue; 435 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb); 436 } 437 } 438 439 static ssize_t ilo_read(struct file *fp, char __user *buf, 440 size_t len, loff_t *off) 441 { 442 int err, found, cnt, pkt_id, pkt_len; 443 struct ccb_data *data = fp->private_data; 444 struct ccb *driver_ccb = &data->driver_ccb; 445 struct ilo_hwinfo *hw = data->ilo_hw; 446 void *pkt; 447 448 if (is_channel_reset(driver_ccb)) { 449 /* 450 * If the device has been reset, applications 451 * need to close and reopen all ccbs. 452 */ 453 return -ENODEV; 454 } 455 456 /* 457 * This function is to be called when data is expected 458 * in the channel, and will return an error if no packet is found 459 * during the loop below. The sleep/retry logic is to allow 460 * applications to call read() immediately post write(), 461 * and give iLO some time to process the sent packet. 462 */ 463 cnt = 20; 464 do { 465 /* look for a received packet */ 466 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id, 467 &pkt_len, &pkt); 468 if (found) 469 break; 470 cnt--; 471 msleep(100); 472 } while (!found && cnt); 473 474 if (!found) 475 return -EAGAIN; 476 477 /* only copy the length of the received packet */ 478 if (pkt_len < len) 479 len = pkt_len; 480 481 err = copy_to_user(buf, pkt, len); 482 483 /* return the received packet to the queue */ 484 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1)); 485 486 return err ? -EFAULT : len; 487 } 488 489 static ssize_t ilo_write(struct file *fp, const char __user *buf, 490 size_t len, loff_t *off) 491 { 492 int err, pkt_id, pkt_len; 493 struct ccb_data *data = fp->private_data; 494 struct ccb *driver_ccb = &data->driver_ccb; 495 struct ilo_hwinfo *hw = data->ilo_hw; 496 void *pkt; 497 498 if (is_channel_reset(driver_ccb)) 499 return -ENODEV; 500 501 /* get a packet to send the user command */ 502 if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt)) 503 return -EBUSY; 504 505 /* limit the length to the length of the packet */ 506 if (pkt_len < len) 507 len = pkt_len; 508 509 /* on failure, set the len to 0 to return empty packet to the device */ 510 err = copy_from_user(pkt, buf, len); 511 if (err) 512 len = 0; 513 514 /* send the packet */ 515 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len); 516 doorbell_set(driver_ccb); 517 518 return err ? -EFAULT : len; 519 } 520 521 static __poll_t ilo_poll(struct file *fp, poll_table *wait) 522 { 523 struct ccb_data *data = fp->private_data; 524 struct ccb *driver_ccb = &data->driver_ccb; 525 526 poll_wait(fp, &data->ccb_waitq, wait); 527 528 if (is_channel_reset(driver_ccb)) 529 return EPOLLERR; 530 else if (ilo_pkt_recv(data->ilo_hw, driver_ccb)) 531 return EPOLLIN | EPOLLRDNORM; 532 533 return 0; 534 } 535 536 static int ilo_close(struct inode *ip, struct file *fp) 537 { 538 int slot; 539 struct ccb_data *data; 540 struct ilo_hwinfo *hw; 541 unsigned long flags; 542 543 slot = iminor(ip) % max_ccb; 544 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); 545 546 spin_lock(&hw->open_lock); 547 548 if (hw->ccb_alloc[slot]->ccb_cnt == 1) { 549 550 data = fp->private_data; 551 552 spin_lock_irqsave(&hw->alloc_lock, flags); 553 hw->ccb_alloc[slot] = NULL; 554 spin_unlock_irqrestore(&hw->alloc_lock, flags); 555 556 ilo_ccb_close(hw->ilo_dev, data); 557 558 kfree(data); 559 } else 560 hw->ccb_alloc[slot]->ccb_cnt--; 561 562 spin_unlock(&hw->open_lock); 563 564 return 0; 565 } 566 567 static int ilo_open(struct inode *ip, struct file *fp) 568 { 569 int slot, error; 570 struct ccb_data *data; 571 struct ilo_hwinfo *hw; 572 unsigned long flags; 573 574 slot = iminor(ip) % max_ccb; 575 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); 576 577 /* new ccb allocation */ 578 data = kzalloc(sizeof(*data), GFP_KERNEL); 579 if (!data) 580 return -ENOMEM; 581 582 spin_lock(&hw->open_lock); 583 584 /* each fd private_data holds sw/hw view of ccb */ 585 if (hw->ccb_alloc[slot] == NULL) { 586 /* create a channel control block for this minor */ 587 error = ilo_ccb_setup(hw, data, slot); 588 if (error) { 589 kfree(data); 590 goto out; 591 } 592 593 data->ccb_cnt = 1; 594 data->ccb_excl = fp->f_flags & O_EXCL; 595 data->ilo_hw = hw; 596 init_waitqueue_head(&data->ccb_waitq); 597 598 /* write the ccb to hw */ 599 spin_lock_irqsave(&hw->alloc_lock, flags); 600 ilo_ccb_open(hw, data, slot); 601 hw->ccb_alloc[slot] = data; 602 spin_unlock_irqrestore(&hw->alloc_lock, flags); 603 604 /* make sure the channel is functional */ 605 error = ilo_ccb_verify(hw, data); 606 if (error) { 607 608 spin_lock_irqsave(&hw->alloc_lock, flags); 609 hw->ccb_alloc[slot] = NULL; 610 spin_unlock_irqrestore(&hw->alloc_lock, flags); 611 612 ilo_ccb_close(hw->ilo_dev, data); 613 614 kfree(data); 615 goto out; 616 } 617 618 } else { 619 kfree(data); 620 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) { 621 /* 622 * The channel exists, and either this open 623 * or a previous open of this channel wants 624 * exclusive access. 625 */ 626 error = -EBUSY; 627 } else { 628 hw->ccb_alloc[slot]->ccb_cnt++; 629 error = 0; 630 } 631 } 632 out: 633 spin_unlock(&hw->open_lock); 634 635 if (!error) 636 fp->private_data = hw->ccb_alloc[slot]; 637 638 return error; 639 } 640 641 static const struct file_operations ilo_fops = { 642 .owner = THIS_MODULE, 643 .read = ilo_read, 644 .write = ilo_write, 645 .poll = ilo_poll, 646 .open = ilo_open, 647 .release = ilo_close, 648 .llseek = noop_llseek, 649 }; 650 651 static irqreturn_t ilo_isr(int irq, void *data) 652 { 653 struct ilo_hwinfo *hw = data; 654 int pending, i; 655 656 spin_lock(&hw->alloc_lock); 657 658 /* check for ccbs which have data */ 659 pending = get_device_outbound(hw); 660 if (!pending) { 661 spin_unlock(&hw->alloc_lock); 662 return IRQ_NONE; 663 } 664 665 if (is_db_reset(pending)) { 666 /* wake up all ccbs if the device was reset */ 667 pending = -1; 668 ilo_set_reset(hw); 669 } 670 671 for (i = 0; i < max_ccb; i++) { 672 if (!hw->ccb_alloc[i]) 673 continue; 674 if (pending & (1 << i)) 675 wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq); 676 } 677 678 /* clear the device of the channels that have been handled */ 679 clear_pending_db(hw, pending); 680 681 spin_unlock(&hw->alloc_lock); 682 683 return IRQ_HANDLED; 684 } 685 686 static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) 687 { 688 pci_iounmap(pdev, hw->db_vaddr); 689 pci_iounmap(pdev, hw->ram_vaddr); 690 pci_iounmap(pdev, hw->mmio_vaddr); 691 } 692 693 static int ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) 694 { 695 int bar; 696 unsigned long off; 697 698 /* map the memory mapped i/o registers */ 699 hw->mmio_vaddr = pci_iomap(pdev, 1, 0); 700 if (hw->mmio_vaddr == NULL) { 701 dev_err(&pdev->dev, "Error mapping mmio\n"); 702 goto out; 703 } 704 705 /* map the adapter shared memory region */ 706 if (pdev->subsystem_device == 0x00E4) { 707 bar = 5; 708 /* Last 8k is reserved for CCBs */ 709 off = pci_resource_len(pdev, bar) - 0x2000; 710 } else { 711 bar = 2; 712 off = 0; 713 } 714 hw->ram_vaddr = pci_iomap_range(pdev, bar, off, max_ccb * ILOHW_CCB_SZ); 715 if (hw->ram_vaddr == NULL) { 716 dev_err(&pdev->dev, "Error mapping shared mem\n"); 717 goto mmio_free; 718 } 719 720 /* map the doorbell aperture */ 721 hw->db_vaddr = pci_iomap(pdev, 3, max_ccb * ONE_DB_SIZE); 722 if (hw->db_vaddr == NULL) { 723 dev_err(&pdev->dev, "Error mapping doorbell\n"); 724 goto ram_free; 725 } 726 727 return 0; 728 ram_free: 729 pci_iounmap(pdev, hw->ram_vaddr); 730 mmio_free: 731 pci_iounmap(pdev, hw->mmio_vaddr); 732 out: 733 return -ENOMEM; 734 } 735 736 static void ilo_remove(struct pci_dev *pdev) 737 { 738 int i, minor; 739 struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev); 740 741 if (!ilo_hw) 742 return; 743 744 clear_device(ilo_hw); 745 746 minor = MINOR(ilo_hw->cdev.dev); 747 for (i = minor; i < minor + max_ccb; i++) 748 device_destroy(ilo_class, MKDEV(ilo_major, i)); 749 750 cdev_del(&ilo_hw->cdev); 751 ilo_disable_interrupts(ilo_hw); 752 free_irq(pdev->irq, ilo_hw); 753 ilo_unmap_device(pdev, ilo_hw); 754 pci_release_regions(pdev); 755 /* 756 * pci_disable_device(pdev) used to be here. But this PCI device has 757 * two functions with interrupt lines connected to a single pin. The 758 * other one is a USB host controller. So when we disable the PIN here 759 * e.g. by rmmod hpilo, the controller stops working. It is because 760 * the interrupt link is disabled in ACPI since it is not refcounted 761 * yet. See acpi_pci_link_free_irq called from acpi_pci_irq_disable. 762 */ 763 kfree(ilo_hw); 764 ilo_hwdev[(minor / max_ccb)] = 0; 765 } 766 767 static int ilo_probe(struct pci_dev *pdev, 768 const struct pci_device_id *ent) 769 { 770 int devnum, minor, start, error = 0; 771 struct ilo_hwinfo *ilo_hw; 772 773 if (pci_match_id(ilo_blacklist, pdev)) { 774 dev_dbg(&pdev->dev, "Not supported on this device\n"); 775 return -ENODEV; 776 } 777 778 if (max_ccb > MAX_CCB) 779 max_ccb = MAX_CCB; 780 else if (max_ccb < MIN_CCB) 781 max_ccb = MIN_CCB; 782 783 /* find a free range for device files */ 784 for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) { 785 if (ilo_hwdev[devnum] == 0) { 786 ilo_hwdev[devnum] = 1; 787 break; 788 } 789 } 790 791 if (devnum == MAX_ILO_DEV) { 792 dev_err(&pdev->dev, "Error finding free device\n"); 793 return -ENODEV; 794 } 795 796 /* track global allocations for this device */ 797 error = -ENOMEM; 798 ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL); 799 if (!ilo_hw) 800 goto out; 801 802 ilo_hw->ilo_dev = pdev; 803 spin_lock_init(&ilo_hw->alloc_lock); 804 spin_lock_init(&ilo_hw->fifo_lock); 805 spin_lock_init(&ilo_hw->open_lock); 806 807 error = pci_enable_device(pdev); 808 if (error) 809 goto free; 810 811 pci_set_master(pdev); 812 813 error = pci_request_regions(pdev, ILO_NAME); 814 if (error) 815 goto disable; 816 817 error = ilo_map_device(pdev, ilo_hw); 818 if (error) 819 goto free_regions; 820 821 pci_set_drvdata(pdev, ilo_hw); 822 clear_device(ilo_hw); 823 824 error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw); 825 if (error) 826 goto unmap; 827 828 ilo_enable_interrupts(ilo_hw); 829 830 cdev_init(&ilo_hw->cdev, &ilo_fops); 831 ilo_hw->cdev.owner = THIS_MODULE; 832 start = devnum * max_ccb; 833 error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), max_ccb); 834 if (error) { 835 dev_err(&pdev->dev, "Could not add cdev\n"); 836 goto remove_isr; 837 } 838 839 for (minor = 0 ; minor < max_ccb; minor++) { 840 struct device *dev; 841 dev = device_create(ilo_class, &pdev->dev, 842 MKDEV(ilo_major, minor), NULL, 843 "hpilo!d%dccb%d", devnum, minor); 844 if (IS_ERR(dev)) 845 dev_err(&pdev->dev, "Could not create files\n"); 846 } 847 848 return 0; 849 remove_isr: 850 ilo_disable_interrupts(ilo_hw); 851 free_irq(pdev->irq, ilo_hw); 852 unmap: 853 ilo_unmap_device(pdev, ilo_hw); 854 free_regions: 855 pci_release_regions(pdev); 856 disable: 857 /* pci_disable_device(pdev); see comment in ilo_remove */ 858 free: 859 kfree(ilo_hw); 860 out: 861 ilo_hwdev[devnum] = 0; 862 return error; 863 } 864 865 static const struct pci_device_id ilo_devices[] = { 866 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) }, 867 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) }, 868 { } 869 }; 870 MODULE_DEVICE_TABLE(pci, ilo_devices); 871 872 static struct pci_driver ilo_driver = { 873 .name = ILO_NAME, 874 .id_table = ilo_devices, 875 .probe = ilo_probe, 876 .remove = ilo_remove, 877 }; 878 879 static int __init ilo_init(void) 880 { 881 int error; 882 dev_t dev; 883 884 ilo_class = class_create(THIS_MODULE, "iLO"); 885 if (IS_ERR(ilo_class)) { 886 error = PTR_ERR(ilo_class); 887 goto out; 888 } 889 890 error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME); 891 if (error) 892 goto class_destroy; 893 894 ilo_major = MAJOR(dev); 895 896 error = pci_register_driver(&ilo_driver); 897 if (error) 898 goto chr_remove; 899 900 return 0; 901 chr_remove: 902 unregister_chrdev_region(dev, MAX_OPEN); 903 class_destroy: 904 class_destroy(ilo_class); 905 out: 906 return error; 907 } 908 909 static void __exit ilo_exit(void) 910 { 911 pci_unregister_driver(&ilo_driver); 912 unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN); 913 class_destroy(ilo_class); 914 } 915 916 MODULE_VERSION("1.5.0"); 917 MODULE_ALIAS(ILO_NAME); 918 MODULE_DESCRIPTION(ILO_NAME); 919 MODULE_AUTHOR("David Altobelli <david.altobelli@hpe.com>"); 920 MODULE_LICENSE("GPL v2"); 921 922 module_param(max_ccb, uint, 0444); 923 MODULE_PARM_DESC(max_ccb, "Maximum number of HP iLO channels to attach (8-24)(default=16)"); 924 925 module_init(ilo_init); 926 module_exit(ilo_exit); 927