drivers/misc/hpilo.c

   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
 697         /* map the memory mapped i/o registers */
 698         hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
 699         if (hw->mmio_vaddr == NULL) {
 700                 dev_err(&pdev->dev, "Error mapping mmio\n");
 701                 goto out;
 702         }
 703
 704         /* map the adapter shared memory region */
 705         if (pdev->subsystem_device == 0x00E4) {
 706                 bar = 5;
 707                 /* Last 8k is reserved for CCBs */
 708                 off = pci_resource_len(pdev, bar) - 0x2000;
 709         } else {
 710                 bar = 2;
 711                 off = 0;
 712         }
 713         hw->ram_vaddr = pci_iomap_range(pdev, bar, off, max_ccb * ILOHW_CCB_SZ);
 714         if (hw->ram_vaddr == NULL) {
 715                 dev_err(&pdev->dev, "Error mapping shared mem\n");
 716                 goto mmio_free;
 717         }
 718
 719         /* map the doorbell aperture */
 720         hw->db_vaddr = pci_iomap(pdev, 3, max_ccb * ONE_DB_SIZE);
 721         if (hw->db_vaddr == NULL) {
 722                 dev_err(&pdev->dev, "Error mapping doorbell\n");
 723                 goto ram_free;
 724         }
 725
 726         return 0;
 727 ram_free:
 728         pci_iounmap(pdev, hw->ram_vaddr);
 729 mmio_free:
 730         pci_iounmap(pdev, hw->mmio_vaddr);
 731 out:
 732         return -ENOMEM;
 733 }
 734
 735 static void ilo_remove(struct pci_dev *pdev)
 736 {
 737         int i, minor;
 738         struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
 739
 740         if (!ilo_hw)
 741                 return;
 742
 743         clear_device(ilo_hw);
 744
 745         minor = MINOR(ilo_hw->cdev.dev);
 746         for (i = minor; i < minor + max_ccb; i++)
 747                 device_destroy(ilo_class, MKDEV(ilo_major, i));
 748
 749         cdev_del(&ilo_hw->cdev);
 750         ilo_disable_interrupts(ilo_hw);
 751         free_irq(pdev->irq, ilo_hw);
 752         ilo_unmap_device(pdev, ilo_hw);
 753         pci_release_regions(pdev);
 754         /*
 755          * pci_disable_device(pdev) used to be here. But this PCI device has
 756          * two functions with interrupt lines connected to a single pin. The
 757          * other one is a USB host controller. So when we disable the PIN here
 758          * e.g. by rmmod hpilo, the controller stops working. It is because
 759          * the interrupt link is disabled in ACPI since it is not refcounted
 760          * yet. See acpi_pci_link_free_irq called from acpi_pci_irq_disable.
 761          */
 762         kfree(ilo_hw);
 763         ilo_hwdev[(minor / max_ccb)] = 0;
 764 }
 765
 766 static int ilo_probe(struct pci_dev *pdev,
 767                                const struct pci_device_id *ent)
 768 {
 769         int devnum, minor, start, error = 0;
 770         struct ilo_hwinfo *ilo_hw;
 771
 772         if (pci_match_id(ilo_blacklist, pdev)) {
 773                 dev_dbg(&pdev->dev, "Not supported on this device\n");
 774                 return -ENODEV;
 775         }
 776
 777         if (max_ccb > MAX_CCB)
 778                 max_ccb = MAX_CCB;
 779         else if (max_ccb < MIN_CCB)
 780                 max_ccb = MIN_CCB;
 781
 782         /* find a free range for device files */
 783         for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
 784                 if (ilo_hwdev[devnum] == 0) {
 785                         ilo_hwdev[devnum] = 1;
 786                         break;
 787                 }
 788         }
 789
 790         if (devnum == MAX_ILO_DEV) {
 791                 dev_err(&pdev->dev, "Error finding free device\n");
 792                 return -ENODEV;
 793         }
 794
 795         /* track global allocations for this device */
 796         error = -ENOMEM;
 797         ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
 798         if (!ilo_hw)
 799                 goto out;
 800
 801         ilo_hw->ilo_dev = pdev;
 802         spin_lock_init(&ilo_hw->alloc_lock);
 803         spin_lock_init(&ilo_hw->fifo_lock);
 804         spin_lock_init(&ilo_hw->open_lock);
 805
 806         error = pci_enable_device(pdev);
 807         if (error)
 808                 goto free;
 809
 810         pci_set_master(pdev);
 811
 812         error = pci_request_regions(pdev, ILO_NAME);
 813         if (error)
 814                 goto disable;
 815
 816         error = ilo_map_device(pdev, ilo_hw);
 817         if (error)
 818                 goto free_regions;
 819
 820         pci_set_drvdata(pdev, ilo_hw);
 821         clear_device(ilo_hw);
 822
 823         error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
 824         if (error)
 825                 goto unmap;
 826
 827         ilo_enable_interrupts(ilo_hw);
 828
 829         cdev_init(&ilo_hw->cdev, &ilo_fops);
 830         ilo_hw->cdev.owner = THIS_MODULE;
 831         start = devnum * max_ccb;
 832         error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), max_ccb);
 833         if (error) {
 834                 dev_err(&pdev->dev, "Could not add cdev\n");
 835                 goto remove_isr;
 836         }
 837
 838         for (minor = 0 ; minor < max_ccb; minor++) {
 839                 struct device *dev;
 840                 dev = device_create(ilo_class, &pdev->dev,
 841                                     MKDEV(ilo_major, minor), NULL,
 842                                     "hpilo!d%dccb%d", devnum, minor);
 843                 if (IS_ERR(dev))
 844                         dev_err(&pdev->dev, "Could not create files\n");
 845         }
 846
 847         return 0;
 848 remove_isr:
 849         ilo_disable_interrupts(ilo_hw);
 850         free_irq(pdev->irq, ilo_hw);
 851 unmap:
 852         ilo_unmap_device(pdev, ilo_hw);
 853 free_regions:
 854         pci_release_regions(pdev);
 855 disable:
 856 /*      pci_disable_device(pdev);  see comment in ilo_remove */
 857 free:
 858         kfree(ilo_hw);
 859 out:
 860         ilo_hwdev[devnum] = 0;
 861         return error;
 862 }
 863
 864 static const struct pci_device_id ilo_devices[] = {
 865         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
 866         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
 867         { }
 868 };
 869 MODULE_DEVICE_TABLE(pci, ilo_devices);
 870
 871 static struct pci_driver ilo_driver = {
 872         .name     = ILO_NAME,
 873         .id_table = ilo_devices,
 874         .probe    = ilo_probe,
 875         .remove   = ilo_remove,
 876 };
 877
 878 static int __init ilo_init(void)
 879 {
 880         int error;
 881         dev_t dev;
 882
 883         ilo_class = class_create(THIS_MODULE, "iLO");
 884         if (IS_ERR(ilo_class)) {
 885                 error = PTR_ERR(ilo_class);
 886                 goto out;
 887         }
 888
 889         error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
 890         if (error)
 891                 goto class_destroy;
 892
 893         ilo_major = MAJOR(dev);
 894
 895         error = pci_register_driver(&ilo_driver);
 896         if (error)
 897                 goto chr_remove;
 898
 899         return 0;
 900 chr_remove:
 901         unregister_chrdev_region(dev, MAX_OPEN);
 902 class_destroy:
 903         class_destroy(ilo_class);
 904 out:
 905         return error;
 906 }
 907
 908 static void __exit ilo_exit(void)
 909 {
 910         pci_unregister_driver(&ilo_driver);
 911         unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
 912         class_destroy(ilo_class);
 913 }
 914
 915 MODULE_VERSION("1.5.0");
 916 MODULE_ALIAS(ILO_NAME);
 917 MODULE_DESCRIPTION(ILO_NAME);
 918 MODULE_AUTHOR("David Altobelli <david.altobelli@hpe.com>");
 919 MODULE_LICENSE("GPL v2");
 920
 921 module_param(max_ccb, uint, 0444);
 922 MODULE_PARM_DESC(max_ccb, "Maximum number of HP iLO channels to attach (8-24)(default=16)");
 923
 924 module_init(ilo_init);
 925 module_exit(ilo_exit);