David Altobelli | 89bcb05 | 2008-07-02 09:38:53 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Driver for HP iLO/iLO2 management processor. |
| 3 | * |
| 4 | * Copyright (C) 2008 Hewlett-Packard Development Company, L.P. |
| 5 | * David Altobelli <david.altobelli@hp.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/fs.h> |
| 15 | #include <linux/pci.h> |
| 16 | #include <linux/ioport.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/file.h> |
| 19 | #include <linux/cdev.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/uaccess.h> |
| 23 | #include <linux/io.h> |
| 24 | #include "hpilo.h" |
| 25 | |
| 26 | static struct class *ilo_class; |
| 27 | static unsigned int ilo_major; |
| 28 | static char ilo_hwdev[MAX_ILO_DEV]; |
| 29 | |
| 30 | static inline int get_entry_id(int entry) |
| 31 | { |
| 32 | return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR; |
| 33 | } |
| 34 | |
| 35 | static inline int get_entry_len(int entry) |
| 36 | { |
| 37 | return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3; |
| 38 | } |
| 39 | |
| 40 | static inline int mk_entry(int id, int len) |
| 41 | { |
| 42 | int qlen = len & 7 ? (len >> 3) + 1 : len >> 3; |
| 43 | return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS; |
| 44 | } |
| 45 | |
| 46 | static inline int desc_mem_sz(int nr_entry) |
| 47 | { |
| 48 | return nr_entry << L2_QENTRY_SZ; |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * FIFO queues, shared with hardware. |
| 53 | * |
| 54 | * If a queue has empty slots, an entry is added to the queue tail, |
| 55 | * and that entry is marked as occupied. |
| 56 | * Entries can be dequeued from the head of the list, when the device |
| 57 | * has marked the entry as consumed. |
| 58 | * |
| 59 | * Returns true on successful queue/dequeue, false on failure. |
| 60 | */ |
| 61 | static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry) |
| 62 | { |
| 63 | struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); |
| 64 | int ret = 0; |
| 65 | |
| 66 | spin_lock(&hw->fifo_lock); |
| 67 | if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask] |
| 68 | & ENTRY_MASK_O)) { |
| 69 | fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |= |
| 70 | (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge; |
| 71 | fifo_q->tail += 1; |
| 72 | ret = 1; |
| 73 | } |
| 74 | spin_unlock(&hw->fifo_lock); |
| 75 | |
| 76 | return ret; |
| 77 | } |
| 78 | |
| 79 | static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry) |
| 80 | { |
| 81 | struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); |
| 82 | int ret = 0; |
| 83 | u64 c; |
| 84 | |
| 85 | spin_lock(&hw->fifo_lock); |
| 86 | c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; |
| 87 | if (c & ENTRY_MASK_C) { |
| 88 | if (entry) |
| 89 | *entry = c & ENTRY_MASK_NOSTATE; |
| 90 | |
| 91 | fifo_q->fifobar[fifo_q->head & fifo_q->imask] = |
| 92 | (c | ENTRY_MASK) + 1; |
| 93 | fifo_q->head += 1; |
| 94 | ret = 1; |
| 95 | } |
| 96 | spin_unlock(&hw->fifo_lock); |
| 97 | |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb, |
| 102 | int dir, int id, int len) |
| 103 | { |
| 104 | char *fifobar; |
| 105 | int entry; |
| 106 | |
| 107 | if (dir == SENDQ) |
| 108 | fifobar = ccb->ccb_u1.send_fifobar; |
| 109 | else |
| 110 | fifobar = ccb->ccb_u3.recv_fifobar; |
| 111 | |
| 112 | entry = mk_entry(id, len); |
| 113 | return fifo_enqueue(hw, fifobar, entry); |
| 114 | } |
| 115 | |
| 116 | static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb, |
| 117 | int dir, int *id, int *len, void **pkt) |
| 118 | { |
| 119 | char *fifobar, *desc; |
| 120 | int entry = 0, pkt_id = 0; |
| 121 | int ret; |
| 122 | |
| 123 | if (dir == SENDQ) { |
| 124 | fifobar = ccb->ccb_u1.send_fifobar; |
| 125 | desc = ccb->ccb_u2.send_desc; |
| 126 | } else { |
| 127 | fifobar = ccb->ccb_u3.recv_fifobar; |
| 128 | desc = ccb->ccb_u4.recv_desc; |
| 129 | } |
| 130 | |
| 131 | ret = fifo_dequeue(hw, fifobar, &entry); |
| 132 | if (ret) { |
| 133 | pkt_id = get_entry_id(entry); |
| 134 | if (id) |
| 135 | *id = pkt_id; |
| 136 | if (len) |
| 137 | *len = get_entry_len(entry); |
| 138 | if (pkt) |
| 139 | *pkt = (void *)(desc + desc_mem_sz(pkt_id)); |
| 140 | } |
| 141 | |
| 142 | return ret; |
| 143 | } |
| 144 | |
| 145 | static inline void doorbell_set(struct ccb *ccb) |
| 146 | { |
| 147 | iowrite8(1, ccb->ccb_u5.db_base); |
| 148 | } |
| 149 | |
| 150 | static inline void doorbell_clr(struct ccb *ccb) |
| 151 | { |
| 152 | iowrite8(2, ccb->ccb_u5.db_base); |
| 153 | } |
| 154 | static inline int ctrl_set(int l2sz, int idxmask, int desclim) |
| 155 | { |
| 156 | int active = 0, go = 1; |
| 157 | return l2sz << CTRL_BITPOS_L2SZ | |
| 158 | idxmask << CTRL_BITPOS_FIFOINDEXMASK | |
| 159 | desclim << CTRL_BITPOS_DESCLIMIT | |
| 160 | active << CTRL_BITPOS_A | |
| 161 | go << CTRL_BITPOS_G; |
| 162 | } |
| 163 | static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz) |
| 164 | { |
| 165 | /* for simplicity, use the same parameters for send and recv ctrls */ |
| 166 | ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); |
| 167 | ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); |
| 168 | } |
| 169 | |
| 170 | static inline int fifo_sz(int nr_entry) |
| 171 | { |
| 172 | /* size of a fifo is determined by the number of entries it contains */ |
| 173 | return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE; |
| 174 | } |
| 175 | |
| 176 | static void fifo_setup(void *base_addr, int nr_entry) |
| 177 | { |
| 178 | struct fifo *fifo_q = base_addr; |
| 179 | int i; |
| 180 | |
| 181 | /* set up an empty fifo */ |
| 182 | fifo_q->head = 0; |
| 183 | fifo_q->tail = 0; |
| 184 | fifo_q->reset = 0; |
| 185 | fifo_q->nrents = nr_entry; |
| 186 | fifo_q->imask = nr_entry - 1; |
| 187 | fifo_q->merge = ENTRY_MASK_O; |
| 188 | |
| 189 | for (i = 0; i < nr_entry; i++) |
| 190 | fifo_q->fifobar[i] = 0; |
| 191 | } |
| 192 | |
| 193 | static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data) |
| 194 | { |
| 195 | struct ccb *driver_ccb; |
| 196 | struct ccb __iomem *device_ccb; |
| 197 | int retries; |
| 198 | |
| 199 | driver_ccb = &data->driver_ccb; |
| 200 | device_ccb = data->mapped_ccb; |
| 201 | |
| 202 | /* complicated dance to tell the hw we are stopping */ |
| 203 | doorbell_clr(driver_ccb); |
| 204 | iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G), |
| 205 | &device_ccb->send_ctrl); |
| 206 | iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G), |
| 207 | &device_ccb->recv_ctrl); |
| 208 | |
| 209 | /* give iLO some time to process stop request */ |
| 210 | for (retries = 1000; retries > 0; retries--) { |
| 211 | doorbell_set(driver_ccb); |
| 212 | udelay(1); |
| 213 | if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A)) |
| 214 | && |
| 215 | !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A))) |
| 216 | break; |
| 217 | } |
| 218 | if (retries == 0) |
| 219 | dev_err(&pdev->dev, "Closing, but controller still active\n"); |
| 220 | |
| 221 | /* clear the hw ccb */ |
| 222 | memset_io(device_ccb, 0, sizeof(struct ccb)); |
| 223 | |
| 224 | /* free resources used to back send/recv queues */ |
| 225 | pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa); |
| 226 | } |
| 227 | |
| 228 | static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) |
| 229 | { |
| 230 | char *dma_va, *dma_pa; |
| 231 | int pkt_id, pkt_sz, i, error; |
| 232 | struct ccb *driver_ccb, *ilo_ccb; |
| 233 | struct pci_dev *pdev; |
| 234 | |
| 235 | driver_ccb = &data->driver_ccb; |
| 236 | ilo_ccb = &data->ilo_ccb; |
| 237 | pdev = hw->ilo_dev; |
| 238 | |
| 239 | data->dma_size = 2 * fifo_sz(NR_QENTRY) + |
| 240 | 2 * desc_mem_sz(NR_QENTRY) + |
| 241 | ILO_START_ALIGN + ILO_CACHE_SZ; |
| 242 | |
| 243 | error = -ENOMEM; |
| 244 | data->dma_va = pci_alloc_consistent(pdev, data->dma_size, |
| 245 | &data->dma_pa); |
| 246 | if (!data->dma_va) |
| 247 | goto out; |
| 248 | |
| 249 | dma_va = (char *)data->dma_va; |
| 250 | dma_pa = (char *)data->dma_pa; |
| 251 | |
| 252 | memset(dma_va, 0, data->dma_size); |
| 253 | |
| 254 | dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN); |
| 255 | dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_START_ALIGN); |
| 256 | |
| 257 | /* |
| 258 | * Create two ccb's, one with virt addrs, one with phys addrs. |
| 259 | * Copy the phys addr ccb to device shared mem. |
| 260 | */ |
| 261 | ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ); |
| 262 | ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ); |
| 263 | |
| 264 | fifo_setup(dma_va, NR_QENTRY); |
| 265 | driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE; |
| 266 | ilo_ccb->ccb_u1.send_fifobar = dma_pa + FIFOHANDLESIZE; |
| 267 | dma_va += fifo_sz(NR_QENTRY); |
| 268 | dma_pa += fifo_sz(NR_QENTRY); |
| 269 | |
| 270 | dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ); |
| 271 | dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_CACHE_SZ); |
| 272 | |
| 273 | fifo_setup(dma_va, NR_QENTRY); |
| 274 | driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE; |
| 275 | ilo_ccb->ccb_u3.recv_fifobar = dma_pa + FIFOHANDLESIZE; |
| 276 | dma_va += fifo_sz(NR_QENTRY); |
| 277 | dma_pa += fifo_sz(NR_QENTRY); |
| 278 | |
| 279 | driver_ccb->ccb_u2.send_desc = dma_va; |
| 280 | ilo_ccb->ccb_u2.send_desc = dma_pa; |
| 281 | dma_pa += desc_mem_sz(NR_QENTRY); |
| 282 | dma_va += desc_mem_sz(NR_QENTRY); |
| 283 | |
| 284 | driver_ccb->ccb_u4.recv_desc = dma_va; |
| 285 | ilo_ccb->ccb_u4.recv_desc = dma_pa; |
| 286 | |
| 287 | driver_ccb->channel = slot; |
| 288 | ilo_ccb->channel = slot; |
| 289 | |
| 290 | driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE); |
| 291 | ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */ |
| 292 | |
| 293 | /* copy the ccb with physical addrs to device memory */ |
| 294 | data->mapped_ccb = (struct ccb __iomem *) |
| 295 | (hw->ram_vaddr + (slot * ILOHW_CCB_SZ)); |
| 296 | memcpy_toio(data->mapped_ccb, ilo_ccb, sizeof(struct ccb)); |
| 297 | |
| 298 | /* put packets on the send and receive queues */ |
| 299 | pkt_sz = 0; |
| 300 | for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) { |
| 301 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz); |
| 302 | doorbell_set(driver_ccb); |
| 303 | } |
| 304 | |
| 305 | pkt_sz = desc_mem_sz(1); |
| 306 | for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) |
| 307 | ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz); |
| 308 | |
| 309 | doorbell_clr(driver_ccb); |
| 310 | |
| 311 | /* make sure iLO is really handling requests */ |
| 312 | for (i = 1000; i > 0; i--) { |
| 313 | if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL)) |
| 314 | break; |
| 315 | udelay(1); |
| 316 | } |
| 317 | |
| 318 | if (i) { |
| 319 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); |
| 320 | doorbell_set(driver_ccb); |
| 321 | } else { |
| 322 | dev_err(&pdev->dev, "Open could not dequeue a packet\n"); |
| 323 | error = -EBUSY; |
| 324 | goto free; |
| 325 | } |
| 326 | |
| 327 | return 0; |
| 328 | free: |
| 329 | pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa); |
| 330 | out: |
| 331 | return error; |
| 332 | } |
| 333 | |
| 334 | static inline int is_channel_reset(struct ccb *ccb) |
| 335 | { |
| 336 | /* check for this particular channel needing a reset */ |
| 337 | return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset; |
| 338 | } |
| 339 | |
| 340 | static inline void set_channel_reset(struct ccb *ccb) |
| 341 | { |
| 342 | /* set a flag indicating this channel needs a reset */ |
| 343 | FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1; |
| 344 | } |
| 345 | |
| 346 | static inline int is_device_reset(struct ilo_hwinfo *hw) |
| 347 | { |
| 348 | /* check for global reset condition */ |
| 349 | return ioread32(&hw->mmio_vaddr[DB_OUT]) & (1 << DB_RESET); |
| 350 | } |
| 351 | |
| 352 | static inline void clear_device(struct ilo_hwinfo *hw) |
| 353 | { |
| 354 | /* clear the device (reset bits, pending channel entries) */ |
| 355 | iowrite32(-1, &hw->mmio_vaddr[DB_OUT]); |
| 356 | } |
| 357 | |
| 358 | static void ilo_locked_reset(struct ilo_hwinfo *hw) |
| 359 | { |
| 360 | int slot; |
| 361 | |
| 362 | /* |
| 363 | * Mapped memory is zeroed on ilo reset, so set a per ccb flag |
| 364 | * to indicate that this ccb needs to be closed and reopened. |
| 365 | */ |
| 366 | for (slot = 0; slot < MAX_CCB; slot++) { |
| 367 | if (!hw->ccb_alloc[slot]) |
| 368 | continue; |
| 369 | set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb); |
| 370 | } |
| 371 | |
| 372 | clear_device(hw); |
| 373 | } |
| 374 | |
| 375 | static void ilo_reset(struct ilo_hwinfo *hw) |
| 376 | { |
| 377 | spin_lock(&hw->alloc_lock); |
| 378 | |
| 379 | /* reset might have been handled after lock was taken */ |
| 380 | if (is_device_reset(hw)) |
| 381 | ilo_locked_reset(hw); |
| 382 | |
| 383 | spin_unlock(&hw->alloc_lock); |
| 384 | } |
| 385 | |
| 386 | static ssize_t ilo_read(struct file *fp, char __user *buf, |
| 387 | size_t len, loff_t *off) |
| 388 | { |
| 389 | int err, found, cnt, pkt_id, pkt_len; |
| 390 | struct ccb_data *data; |
| 391 | struct ccb *driver_ccb; |
| 392 | struct ilo_hwinfo *hw; |
| 393 | void *pkt; |
| 394 | |
| 395 | data = fp->private_data; |
| 396 | driver_ccb = &data->driver_ccb; |
| 397 | hw = data->ilo_hw; |
| 398 | |
| 399 | if (is_device_reset(hw) || is_channel_reset(driver_ccb)) { |
| 400 | /* |
| 401 | * If the device has been reset, applications |
| 402 | * need to close and reopen all ccbs. |
| 403 | */ |
| 404 | ilo_reset(hw); |
| 405 | return -ENODEV; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * This function is to be called when data is expected |
| 410 | * in the channel, and will return an error if no packet is found |
| 411 | * during the loop below. The sleep/retry logic is to allow |
| 412 | * applications to call read() immediately post write(), |
| 413 | * and give iLO some time to process the sent packet. |
| 414 | */ |
| 415 | cnt = 20; |
| 416 | do { |
| 417 | /* look for a received packet */ |
| 418 | found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id, |
| 419 | &pkt_len, &pkt); |
| 420 | if (found) |
| 421 | break; |
| 422 | cnt--; |
| 423 | msleep(100); |
| 424 | } while (!found && cnt); |
| 425 | |
| 426 | if (!found) |
| 427 | return -EAGAIN; |
| 428 | |
| 429 | /* only copy the length of the received packet */ |
| 430 | if (pkt_len < len) |
| 431 | len = pkt_len; |
| 432 | |
| 433 | err = copy_to_user(buf, pkt, len); |
| 434 | |
| 435 | /* return the received packet to the queue */ |
| 436 | ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1)); |
| 437 | |
| 438 | return err ? -EFAULT : len; |
| 439 | } |
| 440 | |
| 441 | static ssize_t ilo_write(struct file *fp, const char __user *buf, |
| 442 | size_t len, loff_t *off) |
| 443 | { |
| 444 | int err, pkt_id, pkt_len; |
| 445 | struct ccb_data *data; |
| 446 | struct ccb *driver_ccb; |
| 447 | struct ilo_hwinfo *hw; |
| 448 | void *pkt; |
| 449 | |
| 450 | data = fp->private_data; |
| 451 | driver_ccb = &data->driver_ccb; |
| 452 | hw = data->ilo_hw; |
| 453 | |
| 454 | if (is_device_reset(hw) || is_channel_reset(driver_ccb)) { |
| 455 | /* |
| 456 | * If the device has been reset, applications |
| 457 | * need to close and reopen all ccbs. |
| 458 | */ |
| 459 | ilo_reset(hw); |
| 460 | return -ENODEV; |
| 461 | } |
| 462 | |
| 463 | /* get a packet to send the user command */ |
| 464 | if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt)) |
| 465 | return -EBUSY; |
| 466 | |
| 467 | /* limit the length to the length of the packet */ |
| 468 | if (pkt_len < len) |
| 469 | len = pkt_len; |
| 470 | |
| 471 | /* on failure, set the len to 0 to return empty packet to the device */ |
| 472 | err = copy_from_user(pkt, buf, len); |
| 473 | if (err) |
| 474 | len = 0; |
| 475 | |
| 476 | /* send the packet */ |
| 477 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len); |
| 478 | doorbell_set(driver_ccb); |
| 479 | |
| 480 | return err ? -EFAULT : len; |
| 481 | } |
| 482 | |
| 483 | static int ilo_close(struct inode *ip, struct file *fp) |
| 484 | { |
| 485 | int slot; |
| 486 | struct ccb_data *data; |
| 487 | struct ilo_hwinfo *hw; |
| 488 | |
| 489 | slot = iminor(ip) % MAX_CCB; |
| 490 | hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); |
| 491 | |
| 492 | spin_lock(&hw->alloc_lock); |
| 493 | |
| 494 | if (is_device_reset(hw)) |
| 495 | ilo_locked_reset(hw); |
| 496 | |
| 497 | if (hw->ccb_alloc[slot]->ccb_cnt == 1) { |
| 498 | |
| 499 | data = fp->private_data; |
| 500 | |
| 501 | ilo_ccb_close(hw->ilo_dev, data); |
| 502 | |
| 503 | kfree(data); |
| 504 | hw->ccb_alloc[slot] = NULL; |
| 505 | } else |
| 506 | hw->ccb_alloc[slot]->ccb_cnt--; |
| 507 | |
| 508 | spin_unlock(&hw->alloc_lock); |
| 509 | |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | static int ilo_open(struct inode *ip, struct file *fp) |
| 514 | { |
| 515 | int slot, error; |
| 516 | struct ccb_data *data; |
| 517 | struct ilo_hwinfo *hw; |
| 518 | |
| 519 | slot = iminor(ip) % MAX_CCB; |
| 520 | hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); |
| 521 | |
| 522 | /* new ccb allocation */ |
| 523 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 524 | if (!data) |
| 525 | return -ENOMEM; |
| 526 | |
| 527 | spin_lock(&hw->alloc_lock); |
| 528 | |
| 529 | if (is_device_reset(hw)) |
| 530 | ilo_locked_reset(hw); |
| 531 | |
| 532 | /* each fd private_data holds sw/hw view of ccb */ |
| 533 | if (hw->ccb_alloc[slot] == NULL) { |
| 534 | /* create a channel control block for this minor */ |
| 535 | error = ilo_ccb_open(hw, data, slot); |
| 536 | if (!error) { |
| 537 | hw->ccb_alloc[slot] = data; |
| 538 | hw->ccb_alloc[slot]->ccb_cnt = 1; |
| 539 | hw->ccb_alloc[slot]->ccb_excl = fp->f_flags & O_EXCL; |
| 540 | hw->ccb_alloc[slot]->ilo_hw = hw; |
| 541 | } else |
| 542 | kfree(data); |
| 543 | } else { |
| 544 | kfree(data); |
| 545 | if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) { |
| 546 | /* |
| 547 | * The channel exists, and either this open |
| 548 | * or a previous open of this channel wants |
| 549 | * exclusive access. |
| 550 | */ |
| 551 | error = -EBUSY; |
| 552 | } else { |
| 553 | hw->ccb_alloc[slot]->ccb_cnt++; |
| 554 | error = 0; |
| 555 | } |
| 556 | } |
| 557 | spin_unlock(&hw->alloc_lock); |
| 558 | |
| 559 | if (!error) |
| 560 | fp->private_data = hw->ccb_alloc[slot]; |
| 561 | |
| 562 | return error; |
| 563 | } |
| 564 | |
| 565 | static const struct file_operations ilo_fops = { |
| 566 | .owner = THIS_MODULE, |
| 567 | .read = ilo_read, |
| 568 | .write = ilo_write, |
| 569 | .open = ilo_open, |
| 570 | .release = ilo_close, |
| 571 | }; |
| 572 | |
| 573 | static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) |
| 574 | { |
| 575 | pci_iounmap(pdev, hw->db_vaddr); |
| 576 | pci_iounmap(pdev, hw->ram_vaddr); |
| 577 | pci_iounmap(pdev, hw->mmio_vaddr); |
| 578 | } |
| 579 | |
| 580 | static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) |
| 581 | { |
| 582 | int error = -ENOMEM; |
| 583 | |
| 584 | /* map the memory mapped i/o registers */ |
| 585 | hw->mmio_vaddr = pci_iomap(pdev, 1, 0); |
| 586 | if (hw->mmio_vaddr == NULL) { |
| 587 | dev_err(&pdev->dev, "Error mapping mmio\n"); |
| 588 | goto out; |
| 589 | } |
| 590 | |
| 591 | /* map the adapter shared memory region */ |
| 592 | hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ); |
| 593 | if (hw->ram_vaddr == NULL) { |
| 594 | dev_err(&pdev->dev, "Error mapping shared mem\n"); |
| 595 | goto mmio_free; |
| 596 | } |
| 597 | |
| 598 | /* map the doorbell aperture */ |
| 599 | hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE); |
| 600 | if (hw->db_vaddr == NULL) { |
| 601 | dev_err(&pdev->dev, "Error mapping doorbell\n"); |
| 602 | goto ram_free; |
| 603 | } |
| 604 | |
| 605 | return 0; |
| 606 | ram_free: |
| 607 | pci_iounmap(pdev, hw->ram_vaddr); |
| 608 | mmio_free: |
| 609 | pci_iounmap(pdev, hw->mmio_vaddr); |
| 610 | out: |
| 611 | return error; |
| 612 | } |
| 613 | |
| 614 | static void ilo_remove(struct pci_dev *pdev) |
| 615 | { |
| 616 | int i, minor; |
| 617 | struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev); |
| 618 | |
| 619 | clear_device(ilo_hw); |
| 620 | |
| 621 | minor = MINOR(ilo_hw->cdev.dev); |
| 622 | for (i = minor; i < minor + MAX_CCB; i++) |
| 623 | device_destroy(ilo_class, MKDEV(ilo_major, i)); |
| 624 | |
| 625 | cdev_del(&ilo_hw->cdev); |
| 626 | ilo_unmap_device(pdev, ilo_hw); |
| 627 | pci_release_regions(pdev); |
| 628 | pci_disable_device(pdev); |
| 629 | kfree(ilo_hw); |
| 630 | ilo_hwdev[(minor / MAX_CCB)] = 0; |
| 631 | } |
| 632 | |
| 633 | static int __devinit ilo_probe(struct pci_dev *pdev, |
| 634 | const struct pci_device_id *ent) |
| 635 | { |
| 636 | int devnum, minor, start, error; |
| 637 | struct ilo_hwinfo *ilo_hw; |
| 638 | |
| 639 | /* find a free range for device files */ |
| 640 | for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) { |
| 641 | if (ilo_hwdev[devnum] == 0) { |
| 642 | ilo_hwdev[devnum] = 1; |
| 643 | break; |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | if (devnum == MAX_ILO_DEV) { |
| 648 | dev_err(&pdev->dev, "Error finding free device\n"); |
| 649 | return -ENODEV; |
| 650 | } |
| 651 | |
| 652 | /* track global allocations for this device */ |
| 653 | error = -ENOMEM; |
| 654 | ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL); |
| 655 | if (!ilo_hw) |
| 656 | goto out; |
| 657 | |
| 658 | ilo_hw->ilo_dev = pdev; |
| 659 | spin_lock_init(&ilo_hw->alloc_lock); |
| 660 | spin_lock_init(&ilo_hw->fifo_lock); |
| 661 | |
| 662 | error = pci_enable_device(pdev); |
| 663 | if (error) |
| 664 | goto free; |
| 665 | |
| 666 | pci_set_master(pdev); |
| 667 | |
| 668 | error = pci_request_regions(pdev, ILO_NAME); |
| 669 | if (error) |
| 670 | goto disable; |
| 671 | |
| 672 | error = ilo_map_device(pdev, ilo_hw); |
| 673 | if (error) |
| 674 | goto free_regions; |
| 675 | |
| 676 | pci_set_drvdata(pdev, ilo_hw); |
| 677 | clear_device(ilo_hw); |
| 678 | |
| 679 | cdev_init(&ilo_hw->cdev, &ilo_fops); |
| 680 | ilo_hw->cdev.owner = THIS_MODULE; |
| 681 | start = devnum * MAX_CCB; |
| 682 | error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB); |
| 683 | if (error) { |
| 684 | dev_err(&pdev->dev, "Could not add cdev\n"); |
| 685 | goto unmap; |
| 686 | } |
| 687 | |
| 688 | for (minor = 0 ; minor < MAX_CCB; minor++) { |
| 689 | struct device *dev; |
| 690 | dev = device_create(ilo_class, &pdev->dev, |
| 691 | MKDEV(ilo_major, minor), NULL, |
| 692 | "hpilo!d%dccb%d", devnum, minor); |
| 693 | if (IS_ERR(dev)) |
| 694 | dev_err(&pdev->dev, "Could not create files\n"); |
| 695 | } |
| 696 | |
| 697 | return 0; |
| 698 | unmap: |
| 699 | ilo_unmap_device(pdev, ilo_hw); |
| 700 | free_regions: |
| 701 | pci_release_regions(pdev); |
| 702 | disable: |
| 703 | pci_disable_device(pdev); |
| 704 | free: |
| 705 | kfree(ilo_hw); |
| 706 | out: |
| 707 | ilo_hwdev[devnum] = 0; |
| 708 | return error; |
| 709 | } |
| 710 | |
| 711 | static struct pci_device_id ilo_devices[] = { |
| 712 | { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) }, |
| 713 | { } |
| 714 | }; |
| 715 | MODULE_DEVICE_TABLE(pci, ilo_devices); |
| 716 | |
| 717 | static struct pci_driver ilo_driver = { |
| 718 | .name = ILO_NAME, |
| 719 | .id_table = ilo_devices, |
| 720 | .probe = ilo_probe, |
| 721 | .remove = __devexit_p(ilo_remove), |
| 722 | }; |
| 723 | |
| 724 | static int __init ilo_init(void) |
| 725 | { |
| 726 | int error; |
| 727 | dev_t dev; |
| 728 | |
| 729 | ilo_class = class_create(THIS_MODULE, "iLO"); |
| 730 | if (IS_ERR(ilo_class)) { |
| 731 | error = PTR_ERR(ilo_class); |
| 732 | goto out; |
| 733 | } |
| 734 | |
| 735 | error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME); |
| 736 | if (error) |
| 737 | goto class_destroy; |
| 738 | |
| 739 | ilo_major = MAJOR(dev); |
| 740 | |
| 741 | error = pci_register_driver(&ilo_driver); |
| 742 | if (error) |
| 743 | goto chr_remove; |
| 744 | |
| 745 | return 0; |
| 746 | chr_remove: |
| 747 | unregister_chrdev_region(dev, MAX_OPEN); |
| 748 | class_destroy: |
| 749 | class_destroy(ilo_class); |
| 750 | out: |
| 751 | return error; |
| 752 | } |
| 753 | |
| 754 | static void __exit ilo_exit(void) |
| 755 | { |
| 756 | pci_unregister_driver(&ilo_driver); |
| 757 | unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN); |
| 758 | class_destroy(ilo_class); |
| 759 | } |
| 760 | |
David Altobelli | c189f4e | 2009-01-29 14:25:23 -0800 | [diff] [blame^] | 761 | MODULE_VERSION("0.06"); |
David Altobelli | 89bcb05 | 2008-07-02 09:38:53 -0600 | [diff] [blame] | 762 | MODULE_ALIAS(ILO_NAME); |
| 763 | MODULE_DESCRIPTION(ILO_NAME); |
| 764 | MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>"); |
| 765 | MODULE_LICENSE("GPL v2"); |
| 766 | |
| 767 | module_init(ilo_init); |
| 768 | module_exit(ilo_exit); |