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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
28static const struct class ilo_class = {
29 .name = "iLO",
30};
31static unsigned int ilo_major;
32static unsigned int max_ccb = 16;
33static char ilo_hwdev[MAX_ILO_DEV];
34static const struct pci_device_id ilo_blacklist[] = {
35 /* auxiliary iLO */
36 {PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3307, PCI_VENDOR_ID_HP, 0x1979)},
37 /* CL */
38 {PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3307, PCI_VENDOR_ID_HP_3PAR, 0x0289)},
39 {}
40};
41
42static inline int get_entry_id(int entry)
43{
44 return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
45}
46
47static inline int get_entry_len(int entry)
48{
49 return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
50}
51
52static inline int mk_entry(int id, int len)
53{
54 int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
55 return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
56}
57
58static inline int desc_mem_sz(int nr_entry)
59{
60 return nr_entry << L2_QENTRY_SZ;
61}
62
63/*
64 * FIFO queues, shared with hardware.
65 *
66 * If a queue has empty slots, an entry is added to the queue tail,
67 * and that entry is marked as occupied.
68 * Entries can be dequeued from the head of the list, when the device
69 * has marked the entry as consumed.
70 *
71 * Returns true on successful queue/dequeue, false on failure.
72 */
73static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
74{
75 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
76 unsigned long flags;
77 int ret = 0;
78
79 spin_lock_irqsave(&hw->fifo_lock, flags);
80 if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
81 & ENTRY_MASK_O)) {
82 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
83 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
84 fifo_q->tail += 1;
85 ret = 1;
86 }
87 spin_unlock_irqrestore(&hw->fifo_lock, flags);
88
89 return ret;
90}
91
92static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
93{
94 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
95 unsigned long flags;
96 int ret = 0;
97 u64 c;
98
99 spin_lock_irqsave(&hw->fifo_lock, flags);
100 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
101 if (c & ENTRY_MASK_C) {
102 if (entry)
103 *entry = c & ENTRY_MASK_NOSTATE;
104
105 fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
106 (c | ENTRY_MASK) + 1;
107 fifo_q->head += 1;
108 ret = 1;
109 }
110 spin_unlock_irqrestore(&hw->fifo_lock, flags);
111
112 return ret;
113}
114
115static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
116{
117 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
118 unsigned long flags;
119 int ret = 0;
120 u64 c;
121
122 spin_lock_irqsave(&hw->fifo_lock, flags);
123 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
124 if (c & ENTRY_MASK_C)
125 ret = 1;
126 spin_unlock_irqrestore(&hw->fifo_lock, flags);
127
128 return ret;
129}
130
131static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
132 int dir, int id, int len)
133{
134 char *fifobar;
135 int entry;
136
137 if (dir == SENDQ)
138 fifobar = ccb->ccb_u1.send_fifobar;
139 else
140 fifobar = ccb->ccb_u3.recv_fifobar;
141
142 entry = mk_entry(id, len);
143 return fifo_enqueue(hw, fifobar, entry);
144}
145
146static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
147 int dir, int *id, int *len, void **pkt)
148{
149 char *fifobar, *desc;
150 int entry = 0, pkt_id = 0;
151 int ret;
152
153 if (dir == SENDQ) {
154 fifobar = ccb->ccb_u1.send_fifobar;
155 desc = ccb->ccb_u2.send_desc;
156 } else {
157 fifobar = ccb->ccb_u3.recv_fifobar;
158 desc = ccb->ccb_u4.recv_desc;
159 }
160
161 ret = fifo_dequeue(hw, fifobar, &entry);
162 if (ret) {
163 pkt_id = get_entry_id(entry);
164 if (id)
165 *id = pkt_id;
166 if (len)
167 *len = get_entry_len(entry);
168 if (pkt)
169 *pkt = (void *)(desc + desc_mem_sz(pkt_id));
170 }
171
172 return ret;
173}
174
175static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
176{
177 char *fifobar = ccb->ccb_u3.recv_fifobar;
178
179 return fifo_check_recv(hw, fifobar);
180}
181
182static inline void doorbell_set(struct ccb *ccb)
183{
184 iowrite8(1, ccb->ccb_u5.db_base);
185}
186
187static inline void doorbell_clr(struct ccb *ccb)
188{
189 iowrite8(2, ccb->ccb_u5.db_base);
190}
191
192static inline int ctrl_set(int l2sz, int idxmask, int desclim)
193{
194 int active = 0, go = 1;
195 return l2sz << CTRL_BITPOS_L2SZ |
196 idxmask << CTRL_BITPOS_FIFOINDEXMASK |
197 desclim << CTRL_BITPOS_DESCLIMIT |
198 active << CTRL_BITPOS_A |
199 go << CTRL_BITPOS_G;
200}
201
202static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
203{
204 /* for simplicity, use the same parameters for send and recv ctrls */
205 ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
206 ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
207}
208
209static inline int fifo_sz(int nr_entry)
210{
211 /* size of a fifo is determined by the number of entries it contains */
212 return nr_entry * sizeof(u64) + FIFOHANDLESIZE;
213}
214
215static void fifo_setup(void *base_addr, int nr_entry)
216{
217 struct fifo *fifo_q = base_addr;
218 int i;
219
220 /* set up an empty fifo */
221 fifo_q->head = 0;
222 fifo_q->tail = 0;
223 fifo_q->reset = 0;
224 fifo_q->nrents = nr_entry;
225 fifo_q->imask = nr_entry - 1;
226 fifo_q->merge = ENTRY_MASK_O;
227
228 for (i = 0; i < nr_entry; i++)
229 fifo_q->fifobar[i] = 0;
230}
231
232static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
233{
234 struct ccb *driver_ccb = &data->driver_ccb;
235 struct ccb __iomem *device_ccb = data->mapped_ccb;
236 int retries;
237
238 /* complicated dance to tell the hw we are stopping */
239 doorbell_clr(driver_ccb);
240 iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
241 &device_ccb->send_ctrl);
242 iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
243 &device_ccb->recv_ctrl);
244
245 /* give iLO some time to process stop request */
246 for (retries = MAX_WAIT; retries > 0; retries--) {
247 doorbell_set(driver_ccb);
248 udelay(WAIT_TIME);
249 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
250 &&
251 !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
252 break;
253 }
254 if (retries == 0)
255 dev_err(&pdev->dev, "Closing, but controller still active\n");
256
257 /* clear the hw ccb */
258 memset_io(device_ccb, 0, sizeof(struct ccb));
259
260 /* free resources used to back send/recv queues */
261 dma_free_coherent(&pdev->dev, data->dma_size, data->dma_va,
262 data->dma_pa);
263}
264
265static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
266{
267 char *dma_va;
268 dma_addr_t dma_pa;
269 struct ccb *driver_ccb, *ilo_ccb;
270
271 driver_ccb = &data->driver_ccb;
272 ilo_ccb = &data->ilo_ccb;
273
274 data->dma_size = 2 * fifo_sz(NR_QENTRY) +
275 2 * desc_mem_sz(NR_QENTRY) +
276 ILO_START_ALIGN + ILO_CACHE_SZ;
277
278 data->dma_va = dma_alloc_coherent(&hw->ilo_dev->dev, data->dma_size,
279 &data->dma_pa, GFP_ATOMIC);
280 if (!data->dma_va)
281 return -ENOMEM;
282
283 dma_va = (char *)data->dma_va;
284 dma_pa = data->dma_pa;
285
286 dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
287 dma_pa = roundup(dma_pa, ILO_START_ALIGN);
288
289 /*
290 * Create two ccb's, one with virt addrs, one with phys addrs.
291 * Copy the phys addr ccb to device shared mem.
292 */
293 ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
294 ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
295
296 fifo_setup(dma_va, NR_QENTRY);
297 driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
298 ilo_ccb->ccb_u1.send_fifobar_pa = dma_pa + FIFOHANDLESIZE;
299 dma_va += fifo_sz(NR_QENTRY);
300 dma_pa += fifo_sz(NR_QENTRY);
301
302 dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
303 dma_pa = roundup(dma_pa, ILO_CACHE_SZ);
304
305 fifo_setup(dma_va, NR_QENTRY);
306 driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
307 ilo_ccb->ccb_u3.recv_fifobar_pa = dma_pa + FIFOHANDLESIZE;
308 dma_va += fifo_sz(NR_QENTRY);
309 dma_pa += fifo_sz(NR_QENTRY);
310
311 driver_ccb->ccb_u2.send_desc = dma_va;
312 ilo_ccb->ccb_u2.send_desc_pa = dma_pa;
313 dma_pa += desc_mem_sz(NR_QENTRY);
314 dma_va += desc_mem_sz(NR_QENTRY);
315
316 driver_ccb->ccb_u4.recv_desc = dma_va;
317 ilo_ccb->ccb_u4.recv_desc_pa = dma_pa;
318
319 driver_ccb->channel = slot;
320 ilo_ccb->channel = slot;
321
322 driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
323 ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
324
325 return 0;
326}
327
328static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
329{
330 int pkt_id, pkt_sz;
331 struct ccb *driver_ccb = &data->driver_ccb;
332
333 /* copy the ccb with physical addrs to device memory */
334 data->mapped_ccb = (struct ccb __iomem *)
335 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
336 memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
337
338 /* put packets on the send and receive queues */
339 pkt_sz = 0;
340 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
341 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
342 doorbell_set(driver_ccb);
343 }
344
345 pkt_sz = desc_mem_sz(1);
346 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
347 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
348
349 /* the ccb is ready to use */
350 doorbell_clr(driver_ccb);
351}
352
353static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
354{
355 int pkt_id, i;
356 struct ccb *driver_ccb = &data->driver_ccb;
357
358 /* make sure iLO is really handling requests */
359 for (i = MAX_WAIT; i > 0; i--) {
360 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
361 break;
362 udelay(WAIT_TIME);
363 }
364
365 if (i == 0) {
366 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
367 return -EBUSY;
368 }
369
370 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
371 doorbell_set(driver_ccb);
372 return 0;
373}
374
375static inline int is_channel_reset(struct ccb *ccb)
376{
377 /* check for this particular channel needing a reset */
378 return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
379}
380
381static inline void set_channel_reset(struct ccb *ccb)
382{
383 /* set a flag indicating this channel needs a reset */
384 FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
385}
386
387static inline int get_device_outbound(struct ilo_hwinfo *hw)
388{
389 return ioread32(&hw->mmio_vaddr[DB_OUT]);
390}
391
392static inline int is_db_reset(int db_out)
393{
394 return db_out & (1 << DB_RESET);
395}
396
397static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
398{
399 iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
400}
401
402static inline void clear_device(struct ilo_hwinfo *hw)
403{
404 /* clear the device (reset bits, pending channel entries) */
405 clear_pending_db(hw, -1);
406}
407
408static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
409{
410 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
411}
412
413static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
414{
415 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
416 &hw->mmio_vaddr[DB_IRQ]);
417}
418
419static void ilo_set_reset(struct ilo_hwinfo *hw)
420{
421 int slot;
422
423 /*
424 * Mapped memory is zeroed on ilo reset, so set a per ccb flag
425 * to indicate that this ccb needs to be closed and reopened.
426 */
427 for (slot = 0; slot < max_ccb; slot++) {
428 if (!hw->ccb_alloc[slot])
429 continue;
430 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
431 }
432}
433
434static ssize_t ilo_read(struct file *fp, char __user *buf,
435 size_t len, loff_t *off)
436{
437 int err, found, cnt, pkt_id, pkt_len;
438 struct ccb_data *data = fp->private_data;
439 struct ccb *driver_ccb = &data->driver_ccb;
440 struct ilo_hwinfo *hw = data->ilo_hw;
441 void *pkt;
442
443 if (is_channel_reset(driver_ccb)) {
444 /*
445 * If the device has been reset, applications
446 * need to close and reopen all ccbs.
447 */
448 return -ENODEV;
449 }
450
451 /*
452 * This function is to be called when data is expected
453 * in the channel, and will return an error if no packet is found
454 * during the loop below. The sleep/retry logic is to allow
455 * applications to call read() immediately post write(),
456 * and give iLO some time to process the sent packet.
457 */
458 cnt = 20;
459 do {
460 /* look for a received packet */
461 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
462 &pkt_len, &pkt);
463 if (found)
464 break;
465 cnt--;
466 msleep(100);
467 } while (!found && cnt);
468
469 if (!found)
470 return -EAGAIN;
471
472 /* only copy the length of the received packet */
473 if (pkt_len < len)
474 len = pkt_len;
475
476 err = copy_to_user(buf, pkt, len);
477
478 /* return the received packet to the queue */
479 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
480
481 return err ? -EFAULT : len;
482}
483
484static ssize_t ilo_write(struct file *fp, const char __user *buf,
485 size_t len, loff_t *off)
486{
487 int err, pkt_id, pkt_len;
488 struct ccb_data *data = fp->private_data;
489 struct ccb *driver_ccb = &data->driver_ccb;
490 struct ilo_hwinfo *hw = data->ilo_hw;
491 void *pkt;
492
493 if (is_channel_reset(driver_ccb))
494 return -ENODEV;
495
496 /* get a packet to send the user command */
497 if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
498 return -EBUSY;
499
500 /* limit the length to the length of the packet */
501 if (pkt_len < len)
502 len = pkt_len;
503
504 /* on failure, set the len to 0 to return empty packet to the device */
505 err = copy_from_user(pkt, buf, len);
506 if (err)
507 len = 0;
508
509 /* send the packet */
510 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
511 doorbell_set(driver_ccb);
512
513 return err ? -EFAULT : len;
514}
515
516static __poll_t ilo_poll(struct file *fp, poll_table *wait)
517{
518 struct ccb_data *data = fp->private_data;
519 struct ccb *driver_ccb = &data->driver_ccb;
520
521 poll_wait(fp, &data->ccb_waitq, wait);
522
523 if (is_channel_reset(driver_ccb))
524 return EPOLLERR;
525 else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
526 return EPOLLIN | EPOLLRDNORM;
527
528 return 0;
529}
530
531static int ilo_close(struct inode *ip, struct file *fp)
532{
533 int slot;
534 struct ccb_data *data;
535 struct ilo_hwinfo *hw;
536 unsigned long flags;
537
538 slot = iminor(ip) % max_ccb;
539 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
540
541 spin_lock(&hw->open_lock);
542
543 if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
544
545 data = fp->private_data;
546
547 spin_lock_irqsave(&hw->alloc_lock, flags);
548 hw->ccb_alloc[slot] = NULL;
549 spin_unlock_irqrestore(&hw->alloc_lock, flags);
550
551 ilo_ccb_close(hw->ilo_dev, data);
552
553 kfree(data);
554 } else
555 hw->ccb_alloc[slot]->ccb_cnt--;
556
557 spin_unlock(&hw->open_lock);
558
559 return 0;
560}
561
562static int ilo_open(struct inode *ip, struct file *fp)
563{
564 int slot, error;
565 struct ccb_data *data;
566 struct ilo_hwinfo *hw;
567 unsigned long flags;
568
569 slot = iminor(ip) % max_ccb;
570 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
571
572 /* new ccb allocation */
573 data = kzalloc(sizeof(*data), GFP_KERNEL);
574 if (!data)
575 return -ENOMEM;
576
577 spin_lock(&hw->open_lock);
578
579 /* each fd private_data holds sw/hw view of ccb */
580 if (hw->ccb_alloc[slot] == NULL) {
581 /* create a channel control block for this minor */
582 error = ilo_ccb_setup(hw, data, slot);
583 if (error) {
584 kfree(data);
585 goto out;
586 }
587
588 data->ccb_cnt = 1;
589 data->ccb_excl = fp->f_flags & O_EXCL;
590 data->ilo_hw = hw;
591 init_waitqueue_head(&data->ccb_waitq);
592
593 /* write the ccb to hw */
594 spin_lock_irqsave(&hw->alloc_lock, flags);
595 ilo_ccb_open(hw, data, slot);
596 hw->ccb_alloc[slot] = data;
597 spin_unlock_irqrestore(&hw->alloc_lock, flags);
598
599 /* make sure the channel is functional */
600 error = ilo_ccb_verify(hw, data);
601 if (error) {
602
603 spin_lock_irqsave(&hw->alloc_lock, flags);
604 hw->ccb_alloc[slot] = NULL;
605 spin_unlock_irqrestore(&hw->alloc_lock, flags);
606
607 ilo_ccb_close(hw->ilo_dev, data);
608
609 kfree(data);
610 goto out;
611 }
612
613 } else {
614 kfree(data);
615 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
616 /*
617 * The channel exists, and either this open
618 * or a previous open of this channel wants
619 * exclusive access.
620 */
621 error = -EBUSY;
622 } else {
623 hw->ccb_alloc[slot]->ccb_cnt++;
624 error = 0;
625 }
626 }
627out:
628 spin_unlock(&hw->open_lock);
629
630 if (!error)
631 fp->private_data = hw->ccb_alloc[slot];
632
633 return error;
634}
635
636static const struct file_operations ilo_fops = {
637 .owner = THIS_MODULE,
638 .read = ilo_read,
639 .write = ilo_write,
640 .poll = ilo_poll,
641 .open = ilo_open,
642 .release = ilo_close,
643 .llseek = noop_llseek,
644};
645
646static irqreturn_t ilo_isr(int irq, void *data)
647{
648 struct ilo_hwinfo *hw = data;
649 int pending, i;
650
651 spin_lock(&hw->alloc_lock);
652
653 /* check for ccbs which have data */
654 pending = get_device_outbound(hw);
655 if (!pending) {
656 spin_unlock(&hw->alloc_lock);
657 return IRQ_NONE;
658 }
659
660 if (is_db_reset(pending)) {
661 /* wake up all ccbs if the device was reset */
662 pending = -1;
663 ilo_set_reset(hw);
664 }
665
666 for (i = 0; i < max_ccb; i++) {
667 if (!hw->ccb_alloc[i])
668 continue;
669 if (pending & (1 << i))
670 wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
671 }
672
673 /* clear the device of the channels that have been handled */
674 clear_pending_db(hw, pending);
675
676 spin_unlock(&hw->alloc_lock);
677
678 return IRQ_HANDLED;
679}
680
681static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
682{
683 pci_iounmap(pdev, hw->db_vaddr);
684 pci_iounmap(pdev, hw->ram_vaddr);
685 pci_iounmap(pdev, hw->mmio_vaddr);
686}
687
688static int ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
689{
690 int bar;
691 unsigned long off;
692 u8 pci_rev_id;
693 int rc;
694
695 /* map the memory mapped i/o registers */
696 hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
697 if (hw->mmio_vaddr == NULL) {
698 dev_err(&pdev->dev, "Error mapping mmio\n");
699 goto out;
700 }
701
702 /* map the adapter shared memory region */
703 rc = pci_read_config_byte(pdev, PCI_REVISION_ID, &pci_rev_id);
704 if (rc != 0) {
705 dev_err(&pdev->dev, "Error reading PCI rev id: %d\n", rc);
706 goto out;
707 }
708
709 if (pci_rev_id >= PCI_REV_ID_NECHES) {
710 bar = 5;
711 /* Last 8k is reserved for CCBs */
712 off = pci_resource_len(pdev, bar) - 0x2000;
713 } else {
714 bar = 2;
715 off = 0;
716 }
717 hw->ram_vaddr = pci_iomap_range(pdev, bar, off, max_ccb * ILOHW_CCB_SZ);
718 if (hw->ram_vaddr == NULL) {
719 dev_err(&pdev->dev, "Error mapping shared mem\n");
720 goto mmio_free;
721 }
722
723 /* map the doorbell aperture */
724 hw->db_vaddr = pci_iomap(pdev, 3, max_ccb * ONE_DB_SIZE);
725 if (hw->db_vaddr == NULL) {
726 dev_err(&pdev->dev, "Error mapping doorbell\n");
727 goto ram_free;
728 }
729
730 return 0;
731ram_free:
732 pci_iounmap(pdev, hw->ram_vaddr);
733mmio_free:
734 pci_iounmap(pdev, hw->mmio_vaddr);
735out:
736 return -ENOMEM;
737}
738
739static void ilo_remove(struct pci_dev *pdev)
740{
741 int i, minor;
742 struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
743
744 if (!ilo_hw)
745 return;
746
747 clear_device(ilo_hw);
748
749 minor = MINOR(ilo_hw->cdev.dev);
750 for (i = minor; i < minor + max_ccb; i++)
751 device_destroy(&ilo_class, MKDEV(ilo_major, i));
752
753 cdev_del(&ilo_hw->cdev);
754 ilo_disable_interrupts(ilo_hw);
755 free_irq(pdev->irq, ilo_hw);
756 ilo_unmap_device(pdev, ilo_hw);
757 pci_release_regions(pdev);
758 /*
759 * pci_disable_device(pdev) used to be here. But this PCI device has
760 * two functions with interrupt lines connected to a single pin. The
761 * other one is a USB host controller. So when we disable the PIN here
762 * e.g. by rmmod hpilo, the controller stops working. It is because
763 * the interrupt link is disabled in ACPI since it is not refcounted
764 * yet. See acpi_pci_link_free_irq called from acpi_pci_irq_disable.
765 */
766 kfree(ilo_hw);
767 ilo_hwdev[(minor / max_ccb)] = 0;
768}
769
770static int ilo_probe(struct pci_dev *pdev,
771 const struct pci_device_id *ent)
772{
773 int devnum, minor, start, error = 0;
774 struct ilo_hwinfo *ilo_hw;
775
776 if (pci_match_id(ilo_blacklist, pdev)) {
777 dev_dbg(&pdev->dev, "Not supported on this device\n");
778 return -ENODEV;
779 }
780
781 if (max_ccb > MAX_CCB)
782 max_ccb = MAX_CCB;
783 else if (max_ccb < MIN_CCB)
784 max_ccb = MIN_CCB;
785
786 /* find a free range for device files */
787 for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
788 if (ilo_hwdev[devnum] == 0) {
789 ilo_hwdev[devnum] = 1;
790 break;
791 }
792 }
793
794 if (devnum == MAX_ILO_DEV) {
795 dev_err(&pdev->dev, "Error finding free device\n");
796 return -ENODEV;
797 }
798
799 /* track global allocations for this device */
800 error = -ENOMEM;
801 ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
802 if (!ilo_hw)
803 goto out;
804
805 ilo_hw->ilo_dev = pdev;
806 spin_lock_init(&ilo_hw->alloc_lock);
807 spin_lock_init(&ilo_hw->fifo_lock);
808 spin_lock_init(&ilo_hw->open_lock);
809
810 error = pci_enable_device(pdev);
811 if (error)
812 goto free;
813
814 pci_set_master(pdev);
815
816 error = pci_request_regions(pdev, ILO_NAME);
817 if (error)
818 goto disable;
819
820 error = ilo_map_device(pdev, ilo_hw);
821 if (error)
822 goto free_regions;
823
824 pci_set_drvdata(pdev, ilo_hw);
825 clear_device(ilo_hw);
826
827 error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
828 if (error)
829 goto unmap;
830
831 ilo_enable_interrupts(ilo_hw);
832
833 cdev_init(&ilo_hw->cdev, &ilo_fops);
834 ilo_hw->cdev.owner = THIS_MODULE;
835 start = devnum * max_ccb;
836 error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), max_ccb);
837 if (error) {
838 dev_err(&pdev->dev, "Could not add cdev\n");
839 goto remove_isr;
840 }
841
842 for (minor = 0 ; minor < max_ccb; minor++) {
843 struct device *dev;
844 dev = device_create(&ilo_class, &pdev->dev,
845 MKDEV(ilo_major, minor), NULL,
846 "hpilo!d%dccb%d", devnum, minor);
847 if (IS_ERR(dev))
848 dev_err(&pdev->dev, "Could not create files\n");
849 }
850
851 return 0;
852remove_isr:
853 ilo_disable_interrupts(ilo_hw);
854 free_irq(pdev->irq, ilo_hw);
855unmap:
856 ilo_unmap_device(pdev, ilo_hw);
857free_regions:
858 pci_release_regions(pdev);
859disable:
860/* pci_disable_device(pdev); see comment in ilo_remove */
861free:
862 kfree(ilo_hw);
863out:
864 ilo_hwdev[devnum] = 0;
865 return error;
866}
867
868static const struct pci_device_id ilo_devices[] = {
869 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
870 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
871 { }
872};
873MODULE_DEVICE_TABLE(pci, ilo_devices);
874
875static struct pci_driver ilo_driver = {
876 .name = ILO_NAME,
877 .id_table = ilo_devices,
878 .probe = ilo_probe,
879 .remove = ilo_remove,
880};
881
882static int __init ilo_init(void)
883{
884 int error;
885 dev_t dev;
886
887 error = class_register(&ilo_class);
888 if (error)
889 goto out;
890
891 error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
892 if (error)
893 goto class_destroy;
894
895 ilo_major = MAJOR(dev);
896
897 error = pci_register_driver(&ilo_driver);
898 if (error)
899 goto chr_remove;
900
901 return 0;
902chr_remove:
903 unregister_chrdev_region(dev, MAX_OPEN);
904class_destroy:
905 class_unregister(&ilo_class);
906out:
907 return error;
908}
909
910static void __exit ilo_exit(void)
911{
912 pci_unregister_driver(&ilo_driver);
913 unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
914 class_unregister(&ilo_class);
915}
916
917MODULE_VERSION("1.5.0");
918MODULE_ALIAS(ILO_NAME);
919MODULE_DESCRIPTION(ILO_NAME);
920MODULE_AUTHOR("David Altobelli <david.altobelli@hpe.com>");
921MODULE_LICENSE("GPL v2");
922
923module_param(max_ccb, uint, 0444);
924MODULE_PARM_DESC(max_ccb, "Maximum number of HP iLO channels to attach (8-24)(default=16)");
925
926module_init(ilo_init);
927module_exit(ilo_exit);
1/*
2 * Driver for the HP iLO management processor.
3 *
4 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
5 * David Altobelli <david.altobelli@hpe.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/interrupt.h>
17#include <linux/ioport.h>
18#include <linux/device.h>
19#include <linux/file.h>
20#include <linux/cdev.h>
21#include <linux/sched.h>
22#include <linux/spinlock.h>
23#include <linux/delay.h>
24#include <linux/uaccess.h>
25#include <linux/io.h>
26#include <linux/wait.h>
27#include <linux/poll.h>
28#include <linux/slab.h>
29#include "hpilo.h"
30
31static struct class *ilo_class;
32static unsigned int ilo_major;
33static unsigned int max_ccb = 16;
34static char ilo_hwdev[MAX_ILO_DEV];
35
36static inline int get_entry_id(int entry)
37{
38 return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
39}
40
41static inline int get_entry_len(int entry)
42{
43 return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
44}
45
46static inline int mk_entry(int id, int len)
47{
48 int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
49 return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
50}
51
52static inline int desc_mem_sz(int nr_entry)
53{
54 return nr_entry << L2_QENTRY_SZ;
55}
56
57/*
58 * FIFO queues, shared with hardware.
59 *
60 * If a queue has empty slots, an entry is added to the queue tail,
61 * and that entry is marked as occupied.
62 * Entries can be dequeued from the head of the list, when the device
63 * has marked the entry as consumed.
64 *
65 * Returns true on successful queue/dequeue, false on failure.
66 */
67static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
68{
69 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
70 unsigned long flags;
71 int ret = 0;
72
73 spin_lock_irqsave(&hw->fifo_lock, flags);
74 if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
75 & ENTRY_MASK_O)) {
76 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
77 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
78 fifo_q->tail += 1;
79 ret = 1;
80 }
81 spin_unlock_irqrestore(&hw->fifo_lock, flags);
82
83 return ret;
84}
85
86static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
87{
88 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
89 unsigned long flags;
90 int ret = 0;
91 u64 c;
92
93 spin_lock_irqsave(&hw->fifo_lock, flags);
94 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
95 if (c & ENTRY_MASK_C) {
96 if (entry)
97 *entry = c & ENTRY_MASK_NOSTATE;
98
99 fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
100 (c | ENTRY_MASK) + 1;
101 fifo_q->head += 1;
102 ret = 1;
103 }
104 spin_unlock_irqrestore(&hw->fifo_lock, flags);
105
106 return ret;
107}
108
109static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
110{
111 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
112 unsigned long flags;
113 int ret = 0;
114 u64 c;
115
116 spin_lock_irqsave(&hw->fifo_lock, flags);
117 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
118 if (c & ENTRY_MASK_C)
119 ret = 1;
120 spin_unlock_irqrestore(&hw->fifo_lock, flags);
121
122 return ret;
123}
124
125static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
126 int dir, int id, int len)
127{
128 char *fifobar;
129 int entry;
130
131 if (dir == SENDQ)
132 fifobar = ccb->ccb_u1.send_fifobar;
133 else
134 fifobar = ccb->ccb_u3.recv_fifobar;
135
136 entry = mk_entry(id, len);
137 return fifo_enqueue(hw, fifobar, entry);
138}
139
140static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
141 int dir, int *id, int *len, void **pkt)
142{
143 char *fifobar, *desc;
144 int entry = 0, pkt_id = 0;
145 int ret;
146
147 if (dir == SENDQ) {
148 fifobar = ccb->ccb_u1.send_fifobar;
149 desc = ccb->ccb_u2.send_desc;
150 } else {
151 fifobar = ccb->ccb_u3.recv_fifobar;
152 desc = ccb->ccb_u4.recv_desc;
153 }
154
155 ret = fifo_dequeue(hw, fifobar, &entry);
156 if (ret) {
157 pkt_id = get_entry_id(entry);
158 if (id)
159 *id = pkt_id;
160 if (len)
161 *len = get_entry_len(entry);
162 if (pkt)
163 *pkt = (void *)(desc + desc_mem_sz(pkt_id));
164 }
165
166 return ret;
167}
168
169static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
170{
171 char *fifobar = ccb->ccb_u3.recv_fifobar;
172
173 return fifo_check_recv(hw, fifobar);
174}
175
176static inline void doorbell_set(struct ccb *ccb)
177{
178 iowrite8(1, ccb->ccb_u5.db_base);
179}
180
181static inline void doorbell_clr(struct ccb *ccb)
182{
183 iowrite8(2, ccb->ccb_u5.db_base);
184}
185
186static inline int ctrl_set(int l2sz, int idxmask, int desclim)
187{
188 int active = 0, go = 1;
189 return l2sz << CTRL_BITPOS_L2SZ |
190 idxmask << CTRL_BITPOS_FIFOINDEXMASK |
191 desclim << CTRL_BITPOS_DESCLIMIT |
192 active << CTRL_BITPOS_A |
193 go << CTRL_BITPOS_G;
194}
195
196static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
197{
198 /* for simplicity, use the same parameters for send and recv ctrls */
199 ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
200 ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
201}
202
203static inline int fifo_sz(int nr_entry)
204{
205 /* size of a fifo is determined by the number of entries it contains */
206 return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE;
207}
208
209static void fifo_setup(void *base_addr, int nr_entry)
210{
211 struct fifo *fifo_q = base_addr;
212 int i;
213
214 /* set up an empty fifo */
215 fifo_q->head = 0;
216 fifo_q->tail = 0;
217 fifo_q->reset = 0;
218 fifo_q->nrents = nr_entry;
219 fifo_q->imask = nr_entry - 1;
220 fifo_q->merge = ENTRY_MASK_O;
221
222 for (i = 0; i < nr_entry; i++)
223 fifo_q->fifobar[i] = 0;
224}
225
226static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
227{
228 struct ccb *driver_ccb = &data->driver_ccb;
229 struct ccb __iomem *device_ccb = data->mapped_ccb;
230 int retries;
231
232 /* complicated dance to tell the hw we are stopping */
233 doorbell_clr(driver_ccb);
234 iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
235 &device_ccb->send_ctrl);
236 iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
237 &device_ccb->recv_ctrl);
238
239 /* give iLO some time to process stop request */
240 for (retries = MAX_WAIT; retries > 0; retries--) {
241 doorbell_set(driver_ccb);
242 udelay(WAIT_TIME);
243 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
244 &&
245 !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
246 break;
247 }
248 if (retries == 0)
249 dev_err(&pdev->dev, "Closing, but controller still active\n");
250
251 /* clear the hw ccb */
252 memset_io(device_ccb, 0, sizeof(struct ccb));
253
254 /* free resources used to back send/recv queues */
255 pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
256}
257
258static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
259{
260 char *dma_va;
261 dma_addr_t dma_pa;
262 struct ccb *driver_ccb, *ilo_ccb;
263
264 driver_ccb = &data->driver_ccb;
265 ilo_ccb = &data->ilo_ccb;
266
267 data->dma_size = 2 * fifo_sz(NR_QENTRY) +
268 2 * desc_mem_sz(NR_QENTRY) +
269 ILO_START_ALIGN + ILO_CACHE_SZ;
270
271 data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size,
272 &data->dma_pa);
273 if (!data->dma_va)
274 return -ENOMEM;
275
276 dma_va = (char *)data->dma_va;
277 dma_pa = data->dma_pa;
278
279 memset(dma_va, 0, data->dma_size);
280
281 dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
282 dma_pa = roundup(dma_pa, ILO_START_ALIGN);
283
284 /*
285 * Create two ccb's, one with virt addrs, one with phys addrs.
286 * Copy the phys addr ccb to device shared mem.
287 */
288 ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
289 ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
290
291 fifo_setup(dma_va, NR_QENTRY);
292 driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
293 ilo_ccb->ccb_u1.send_fifobar_pa = dma_pa + FIFOHANDLESIZE;
294 dma_va += fifo_sz(NR_QENTRY);
295 dma_pa += fifo_sz(NR_QENTRY);
296
297 dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
298 dma_pa = roundup(dma_pa, ILO_CACHE_SZ);
299
300 fifo_setup(dma_va, NR_QENTRY);
301 driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
302 ilo_ccb->ccb_u3.recv_fifobar_pa = dma_pa + FIFOHANDLESIZE;
303 dma_va += fifo_sz(NR_QENTRY);
304 dma_pa += fifo_sz(NR_QENTRY);
305
306 driver_ccb->ccb_u2.send_desc = dma_va;
307 ilo_ccb->ccb_u2.send_desc_pa = dma_pa;
308 dma_pa += desc_mem_sz(NR_QENTRY);
309 dma_va += desc_mem_sz(NR_QENTRY);
310
311 driver_ccb->ccb_u4.recv_desc = dma_va;
312 ilo_ccb->ccb_u4.recv_desc_pa = dma_pa;
313
314 driver_ccb->channel = slot;
315 ilo_ccb->channel = slot;
316
317 driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
318 ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
319
320 return 0;
321}
322
323static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
324{
325 int pkt_id, pkt_sz;
326 struct ccb *driver_ccb = &data->driver_ccb;
327
328 /* copy the ccb with physical addrs to device memory */
329 data->mapped_ccb = (struct ccb __iomem *)
330 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
331 memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
332
333 /* put packets on the send and receive queues */
334 pkt_sz = 0;
335 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
336 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
337 doorbell_set(driver_ccb);
338 }
339
340 pkt_sz = desc_mem_sz(1);
341 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
342 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
343
344 /* the ccb is ready to use */
345 doorbell_clr(driver_ccb);
346}
347
348static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
349{
350 int pkt_id, i;
351 struct ccb *driver_ccb = &data->driver_ccb;
352
353 /* make sure iLO is really handling requests */
354 for (i = MAX_WAIT; i > 0; i--) {
355 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
356 break;
357 udelay(WAIT_TIME);
358 }
359
360 if (i == 0) {
361 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
362 return -EBUSY;
363 }
364
365 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
366 doorbell_set(driver_ccb);
367 return 0;
368}
369
370static inline int is_channel_reset(struct ccb *ccb)
371{
372 /* check for this particular channel needing a reset */
373 return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
374}
375
376static inline void set_channel_reset(struct ccb *ccb)
377{
378 /* set a flag indicating this channel needs a reset */
379 FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
380}
381
382static inline int get_device_outbound(struct ilo_hwinfo *hw)
383{
384 return ioread32(&hw->mmio_vaddr[DB_OUT]);
385}
386
387static inline int is_db_reset(int db_out)
388{
389 return db_out & (1 << DB_RESET);
390}
391
392static inline int is_device_reset(struct ilo_hwinfo *hw)
393{
394 /* check for global reset condition */
395 return is_db_reset(get_device_outbound(hw));
396}
397
398static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
399{
400 iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
401}
402
403static inline void clear_device(struct ilo_hwinfo *hw)
404{
405 /* clear the device (reset bits, pending channel entries) */
406 clear_pending_db(hw, -1);
407}
408
409static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
410{
411 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
412}
413
414static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
415{
416 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
417 &hw->mmio_vaddr[DB_IRQ]);
418}
419
420static void ilo_set_reset(struct ilo_hwinfo *hw)
421{
422 int slot;
423
424 /*
425 * Mapped memory is zeroed on ilo reset, so set a per ccb flag
426 * to indicate that this ccb needs to be closed and reopened.
427 */
428 for (slot = 0; slot < max_ccb; slot++) {
429 if (!hw->ccb_alloc[slot])
430 continue;
431 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
432 }
433}
434
435static ssize_t ilo_read(struct file *fp, char __user *buf,
436 size_t len, loff_t *off)
437{
438 int err, found, cnt, pkt_id, pkt_len;
439 struct ccb_data *data = fp->private_data;
440 struct ccb *driver_ccb = &data->driver_ccb;
441 struct ilo_hwinfo *hw = data->ilo_hw;
442 void *pkt;
443
444 if (is_channel_reset(driver_ccb)) {
445 /*
446 * If the device has been reset, applications
447 * need to close and reopen all ccbs.
448 */
449 return -ENODEV;
450 }
451
452 /*
453 * This function is to be called when data is expected
454 * in the channel, and will return an error if no packet is found
455 * during the loop below. The sleep/retry logic is to allow
456 * applications to call read() immediately post write(),
457 * and give iLO some time to process the sent packet.
458 */
459 cnt = 20;
460 do {
461 /* look for a received packet */
462 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
463 &pkt_len, &pkt);
464 if (found)
465 break;
466 cnt--;
467 msleep(100);
468 } while (!found && cnt);
469
470 if (!found)
471 return -EAGAIN;
472
473 /* only copy the length of the received packet */
474 if (pkt_len < len)
475 len = pkt_len;
476
477 err = copy_to_user(buf, pkt, len);
478
479 /* return the received packet to the queue */
480 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
481
482 return err ? -EFAULT : len;
483}
484
485static ssize_t ilo_write(struct file *fp, const char __user *buf,
486 size_t len, loff_t *off)
487{
488 int err, pkt_id, pkt_len;
489 struct ccb_data *data = fp->private_data;
490 struct ccb *driver_ccb = &data->driver_ccb;
491 struct ilo_hwinfo *hw = data->ilo_hw;
492 void *pkt;
493
494 if (is_channel_reset(driver_ccb))
495 return -ENODEV;
496
497 /* get a packet to send the user command */
498 if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
499 return -EBUSY;
500
501 /* limit the length to the length of the packet */
502 if (pkt_len < len)
503 len = pkt_len;
504
505 /* on failure, set the len to 0 to return empty packet to the device */
506 err = copy_from_user(pkt, buf, len);
507 if (err)
508 len = 0;
509
510 /* send the packet */
511 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
512 doorbell_set(driver_ccb);
513
514 return err ? -EFAULT : len;
515}
516
517static unsigned int ilo_poll(struct file *fp, poll_table *wait)
518{
519 struct ccb_data *data = fp->private_data;
520 struct ccb *driver_ccb = &data->driver_ccb;
521
522 poll_wait(fp, &data->ccb_waitq, wait);
523
524 if (is_channel_reset(driver_ccb))
525 return POLLERR;
526 else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
527 return POLLIN | POLLRDNORM;
528
529 return 0;
530}
531
532static int ilo_close(struct inode *ip, struct file *fp)
533{
534 int slot;
535 struct ccb_data *data;
536 struct ilo_hwinfo *hw;
537 unsigned long flags;
538
539 slot = iminor(ip) % max_ccb;
540 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
541
542 spin_lock(&hw->open_lock);
543
544 if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
545
546 data = fp->private_data;
547
548 spin_lock_irqsave(&hw->alloc_lock, flags);
549 hw->ccb_alloc[slot] = NULL;
550 spin_unlock_irqrestore(&hw->alloc_lock, flags);
551
552 ilo_ccb_close(hw->ilo_dev, data);
553
554 kfree(data);
555 } else
556 hw->ccb_alloc[slot]->ccb_cnt--;
557
558 spin_unlock(&hw->open_lock);
559
560 return 0;
561}
562
563static int ilo_open(struct inode *ip, struct file *fp)
564{
565 int slot, error;
566 struct ccb_data *data;
567 struct ilo_hwinfo *hw;
568 unsigned long flags;
569
570 slot = iminor(ip) % max_ccb;
571 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
572
573 /* new ccb allocation */
574 data = kzalloc(sizeof(*data), GFP_KERNEL);
575 if (!data)
576 return -ENOMEM;
577
578 spin_lock(&hw->open_lock);
579
580 /* each fd private_data holds sw/hw view of ccb */
581 if (hw->ccb_alloc[slot] == NULL) {
582 /* create a channel control block for this minor */
583 error = ilo_ccb_setup(hw, data, slot);
584 if (error) {
585 kfree(data);
586 goto out;
587 }
588
589 data->ccb_cnt = 1;
590 data->ccb_excl = fp->f_flags & O_EXCL;
591 data->ilo_hw = hw;
592 init_waitqueue_head(&data->ccb_waitq);
593
594 /* write the ccb to hw */
595 spin_lock_irqsave(&hw->alloc_lock, flags);
596 ilo_ccb_open(hw, data, slot);
597 hw->ccb_alloc[slot] = data;
598 spin_unlock_irqrestore(&hw->alloc_lock, flags);
599
600 /* make sure the channel is functional */
601 error = ilo_ccb_verify(hw, data);
602 if (error) {
603
604 spin_lock_irqsave(&hw->alloc_lock, flags);
605 hw->ccb_alloc[slot] = NULL;
606 spin_unlock_irqrestore(&hw->alloc_lock, flags);
607
608 ilo_ccb_close(hw->ilo_dev, data);
609
610 kfree(data);
611 goto out;
612 }
613
614 } else {
615 kfree(data);
616 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
617 /*
618 * The channel exists, and either this open
619 * or a previous open of this channel wants
620 * exclusive access.
621 */
622 error = -EBUSY;
623 } else {
624 hw->ccb_alloc[slot]->ccb_cnt++;
625 error = 0;
626 }
627 }
628out:
629 spin_unlock(&hw->open_lock);
630
631 if (!error)
632 fp->private_data = hw->ccb_alloc[slot];
633
634 return error;
635}
636
637static const struct file_operations ilo_fops = {
638 .owner = THIS_MODULE,
639 .read = ilo_read,
640 .write = ilo_write,
641 .poll = ilo_poll,
642 .open = ilo_open,
643 .release = ilo_close,
644 .llseek = noop_llseek,
645};
646
647static irqreturn_t ilo_isr(int irq, void *data)
648{
649 struct ilo_hwinfo *hw = data;
650 int pending, i;
651
652 spin_lock(&hw->alloc_lock);
653
654 /* check for ccbs which have data */
655 pending = get_device_outbound(hw);
656 if (!pending) {
657 spin_unlock(&hw->alloc_lock);
658 return IRQ_NONE;
659 }
660
661 if (is_db_reset(pending)) {
662 /* wake up all ccbs if the device was reset */
663 pending = -1;
664 ilo_set_reset(hw);
665 }
666
667 for (i = 0; i < max_ccb; i++) {
668 if (!hw->ccb_alloc[i])
669 continue;
670 if (pending & (1 << i))
671 wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
672 }
673
674 /* clear the device of the channels that have been handled */
675 clear_pending_db(hw, pending);
676
677 spin_unlock(&hw->alloc_lock);
678
679 return IRQ_HANDLED;
680}
681
682static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
683{
684 pci_iounmap(pdev, hw->db_vaddr);
685 pci_iounmap(pdev, hw->ram_vaddr);
686 pci_iounmap(pdev, hw->mmio_vaddr);
687}
688
689static int ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
690{
691 int bar;
692 unsigned long off;
693
694 /* map the memory mapped i/o registers */
695 hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
696 if (hw->mmio_vaddr == NULL) {
697 dev_err(&pdev->dev, "Error mapping mmio\n");
698 goto out;
699 }
700
701 /* map the adapter shared memory region */
702 if (pdev->subsystem_device == 0x00E4) {
703 bar = 5;
704 /* Last 8k is reserved for CCBs */
705 off = pci_resource_len(pdev, bar) - 0x2000;
706 } else {
707 bar = 2;
708 off = 0;
709 }
710 hw->ram_vaddr = pci_iomap_range(pdev, bar, off, max_ccb * ILOHW_CCB_SZ);
711 if (hw->ram_vaddr == NULL) {
712 dev_err(&pdev->dev, "Error mapping shared mem\n");
713 goto mmio_free;
714 }
715
716 /* map the doorbell aperture */
717 hw->db_vaddr = pci_iomap(pdev, 3, max_ccb * ONE_DB_SIZE);
718 if (hw->db_vaddr == NULL) {
719 dev_err(&pdev->dev, "Error mapping doorbell\n");
720 goto ram_free;
721 }
722
723 return 0;
724ram_free:
725 pci_iounmap(pdev, hw->ram_vaddr);
726mmio_free:
727 pci_iounmap(pdev, hw->mmio_vaddr);
728out:
729 return -ENOMEM;
730}
731
732static void ilo_remove(struct pci_dev *pdev)
733{
734 int i, minor;
735 struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
736
737 if (!ilo_hw)
738 return;
739
740 clear_device(ilo_hw);
741
742 minor = MINOR(ilo_hw->cdev.dev);
743 for (i = minor; i < minor + max_ccb; i++)
744 device_destroy(ilo_class, MKDEV(ilo_major, i));
745
746 cdev_del(&ilo_hw->cdev);
747 ilo_disable_interrupts(ilo_hw);
748 free_irq(pdev->irq, ilo_hw);
749 ilo_unmap_device(pdev, ilo_hw);
750 pci_release_regions(pdev);
751 /*
752 * pci_disable_device(pdev) used to be here. But this PCI device has
753 * two functions with interrupt lines connected to a single pin. The
754 * other one is a USB host controller. So when we disable the PIN here
755 * e.g. by rmmod hpilo, the controller stops working. It is because
756 * the interrupt link is disabled in ACPI since it is not refcounted
757 * yet. See acpi_pci_link_free_irq called from acpi_pci_irq_disable.
758 */
759 kfree(ilo_hw);
760 ilo_hwdev[(minor / max_ccb)] = 0;
761}
762
763static int ilo_probe(struct pci_dev *pdev,
764 const struct pci_device_id *ent)
765{
766 int devnum, minor, start, error = 0;
767 struct ilo_hwinfo *ilo_hw;
768
769 /* Ignore subsystem_device = 0x1979 (set by BIOS) */
770 if (pdev->subsystem_device == 0x1979)
771 return 0;
772
773 if (max_ccb > MAX_CCB)
774 max_ccb = MAX_CCB;
775 else if (max_ccb < MIN_CCB)
776 max_ccb = MIN_CCB;
777
778 /* find a free range for device files */
779 for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
780 if (ilo_hwdev[devnum] == 0) {
781 ilo_hwdev[devnum] = 1;
782 break;
783 }
784 }
785
786 if (devnum == MAX_ILO_DEV) {
787 dev_err(&pdev->dev, "Error finding free device\n");
788 return -ENODEV;
789 }
790
791 /* track global allocations for this device */
792 error = -ENOMEM;
793 ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
794 if (!ilo_hw)
795 goto out;
796
797 ilo_hw->ilo_dev = pdev;
798 spin_lock_init(&ilo_hw->alloc_lock);
799 spin_lock_init(&ilo_hw->fifo_lock);
800 spin_lock_init(&ilo_hw->open_lock);
801
802 error = pci_enable_device(pdev);
803 if (error)
804 goto free;
805
806 pci_set_master(pdev);
807
808 error = pci_request_regions(pdev, ILO_NAME);
809 if (error)
810 goto disable;
811
812 error = ilo_map_device(pdev, ilo_hw);
813 if (error)
814 goto free_regions;
815
816 pci_set_drvdata(pdev, ilo_hw);
817 clear_device(ilo_hw);
818
819 error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
820 if (error)
821 goto unmap;
822
823 ilo_enable_interrupts(ilo_hw);
824
825 cdev_init(&ilo_hw->cdev, &ilo_fops);
826 ilo_hw->cdev.owner = THIS_MODULE;
827 start = devnum * max_ccb;
828 error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), max_ccb);
829 if (error) {
830 dev_err(&pdev->dev, "Could not add cdev\n");
831 goto remove_isr;
832 }
833
834 for (minor = 0 ; minor < max_ccb; minor++) {
835 struct device *dev;
836 dev = device_create(ilo_class, &pdev->dev,
837 MKDEV(ilo_major, minor), NULL,
838 "hpilo!d%dccb%d", devnum, minor);
839 if (IS_ERR(dev))
840 dev_err(&pdev->dev, "Could not create files\n");
841 }
842
843 return 0;
844remove_isr:
845 ilo_disable_interrupts(ilo_hw);
846 free_irq(pdev->irq, ilo_hw);
847unmap:
848 ilo_unmap_device(pdev, ilo_hw);
849free_regions:
850 pci_release_regions(pdev);
851disable:
852/* pci_disable_device(pdev); see comment in ilo_remove */
853free:
854 kfree(ilo_hw);
855out:
856 ilo_hwdev[devnum] = 0;
857 return error;
858}
859
860static struct pci_device_id ilo_devices[] = {
861 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
862 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
863 { }
864};
865MODULE_DEVICE_TABLE(pci, ilo_devices);
866
867static struct pci_driver ilo_driver = {
868 .name = ILO_NAME,
869 .id_table = ilo_devices,
870 .probe = ilo_probe,
871 .remove = ilo_remove,
872};
873
874static int __init ilo_init(void)
875{
876 int error;
877 dev_t dev;
878
879 ilo_class = class_create(THIS_MODULE, "iLO");
880 if (IS_ERR(ilo_class)) {
881 error = PTR_ERR(ilo_class);
882 goto out;
883 }
884
885 error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
886 if (error)
887 goto class_destroy;
888
889 ilo_major = MAJOR(dev);
890
891 error = pci_register_driver(&ilo_driver);
892 if (error)
893 goto chr_remove;
894
895 return 0;
896chr_remove:
897 unregister_chrdev_region(dev, MAX_OPEN);
898class_destroy:
899 class_destroy(ilo_class);
900out:
901 return error;
902}
903
904static void __exit ilo_exit(void)
905{
906 pci_unregister_driver(&ilo_driver);
907 unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
908 class_destroy(ilo_class);
909}
910
911MODULE_VERSION("1.5.0");
912MODULE_ALIAS(ILO_NAME);
913MODULE_DESCRIPTION(ILO_NAME);
914MODULE_AUTHOR("David Altobelli <david.altobelli@hpe.com>");
915MODULE_LICENSE("GPL v2");
916
917module_param(max_ccb, uint, 0444);
918MODULE_PARM_DESC(max_ccb, "Maximum number of HP iLO channels to attach (8-24)(default=16)");
919
920module_init(ilo_init);
921module_exit(ilo_exit);