2 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 * This file contains support for diagnostic functions. It is accessed by
36 * opening the ipath_diag device, normally minor number 129. Diagnostic use
37 * of the InfiniPath chip may render the chip or board unusable until the
38 * driver is unloaded, or in some cases, until the system is rebooted.
40 * Accesses to the chip through this interface are not similar to going
41 * through the /sys/bus/pci resource mmap interface.
45 #include <linux/pci.h>
46 #include <linux/vmalloc.h>
47 #include <asm/uaccess.h>
49 #include "ipath_kernel.h"
50 #include "ipath_common.h"
53 static int diag_set_link;
55 static int ipath_diag_open(struct inode *in, struct file *fp);
56 static int ipath_diag_release(struct inode *in, struct file *fp);
57 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
58 size_t count, loff_t *off);
59 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
60 size_t count, loff_t *off);
62 static const struct file_operations diag_file_ops = {
64 .write = ipath_diag_write,
65 .read = ipath_diag_read,
66 .open = ipath_diag_open,
67 .release = ipath_diag_release
70 static ssize_t ipath_diagpkt_write(struct file *fp,
71 const char __user *data,
72 size_t count, loff_t *off);
74 static const struct file_operations diagpkt_file_ops = {
76 .write = ipath_diagpkt_write,
79 static atomic_t diagpkt_count = ATOMIC_INIT(0);
80 static struct cdev *diagpkt_cdev;
81 static struct class_device *diagpkt_class_dev;
83 int ipath_diag_add(struct ipath_devdata *dd)
88 if (atomic_inc_return(&diagpkt_count) == 1) {
89 ret = ipath_cdev_init(IPATH_DIAGPKT_MINOR,
90 "ipath_diagpkt", &diagpkt_file_ops,
91 &diagpkt_cdev, &diagpkt_class_dev);
94 ipath_dev_err(dd, "Couldn't create ipath_diagpkt "
100 snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit);
102 ret = ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
103 &diag_file_ops, &dd->diag_cdev,
104 &dd->diag_class_dev);
106 ipath_dev_err(dd, "Couldn't create %s device: %d",
113 void ipath_diag_remove(struct ipath_devdata *dd)
115 if (atomic_dec_and_test(&diagpkt_count))
116 ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_class_dev);
118 ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_class_dev);
122 * ipath_read_umem64 - read a 64-bit quantity from the chip into user space
123 * @dd: the infinipath device
124 * @uaddr: the location to store the data in user memory
125 * @caddr: the source chip address (full pointer, not offset)
126 * @count: number of bytes to copy (multiple of 32 bits)
128 * This function also localizes all chip memory accesses.
129 * The copy should be written such that we read full cacheline packets
130 * from the chip. This is usually used for a single qword
132 * NOTE: This assumes the chip address is 64-bit aligned.
134 static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr,
135 const void __iomem *caddr, size_t count)
137 const u64 __iomem *reg_addr = caddr;
138 const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
141 /* not very efficient, but it works for now */
142 if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
146 while (reg_addr < reg_end) {
147 u64 data = readq(reg_addr);
148 if (copy_to_user(uaddr, &data, sizeof(u64))) {
153 uaddr += sizeof(u64);
161 * ipath_write_umem64 - write a 64-bit quantity to the chip from user space
162 * @dd: the infinipath device
163 * @caddr: the destination chip address (full pointer, not offset)
164 * @uaddr: the source of the data in user memory
165 * @count: the number of bytes to copy (multiple of 32 bits)
167 * This is usually used for a single qword
168 * NOTE: This assumes the chip address is 64-bit aligned.
171 static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr,
172 const void __user *uaddr, size_t count)
174 u64 __iomem *reg_addr = caddr;
175 const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
178 /* not very efficient, but it works for now */
179 if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
183 while (reg_addr < reg_end) {
185 if (copy_from_user(&data, uaddr, sizeof(data))) {
189 writeq(data, reg_addr);
192 uaddr += sizeof(u64);
200 * ipath_read_umem32 - read a 32-bit quantity from the chip into user space
201 * @dd: the infinipath device
202 * @uaddr: the location to store the data in user memory
203 * @caddr: the source chip address (full pointer, not offset)
204 * @count: number of bytes to copy
206 * read 32 bit values, not 64 bit; for memories that only
207 * support 32 bit reads; usually a single dword.
209 static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr,
210 const void __iomem *caddr, size_t count)
212 const u32 __iomem *reg_addr = caddr;
213 const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
216 if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
217 reg_end > (u32 __iomem *) dd->ipath_kregend) {
221 /* not very efficient, but it works for now */
222 while (reg_addr < reg_end) {
223 u32 data = readl(reg_addr);
224 if (copy_to_user(uaddr, &data, sizeof(data))) {
230 uaddr += sizeof(u32);
239 * ipath_write_umem32 - write a 32-bit quantity to the chip from user space
240 * @dd: the infinipath device
241 * @caddr: the destination chip address (full pointer, not offset)
242 * @uaddr: the source of the data in user memory
243 * @count: number of bytes to copy
245 * write 32 bit values, not 64 bit; for memories that only
246 * support 32 bit write; usually a single dword.
249 static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr,
250 const void __user *uaddr, size_t count)
252 u32 __iomem *reg_addr = caddr;
253 const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
256 if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
257 reg_end > (u32 __iomem *) dd->ipath_kregend) {
261 while (reg_addr < reg_end) {
263 if (copy_from_user(&data, uaddr, sizeof(data))) {
267 writel(data, reg_addr);
270 uaddr += sizeof(u32);
277 static int ipath_diag_open(struct inode *in, struct file *fp)
279 int unit = iminor(in) - IPATH_DIAG_MINOR_BASE;
280 struct ipath_devdata *dd;
283 mutex_lock(&ipath_mutex);
285 if (ipath_diag_inuse) {
290 dd = ipath_lookup(unit);
292 if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) ||
293 !dd->ipath_kregbase) {
298 fp->private_data = dd;
299 ipath_diag_inuse = -2;
303 /* Only expose a way to reset the device if we
304 make it into diag mode. */
305 ipath_expose_reset(&dd->pcidev->dev);
308 mutex_unlock(&ipath_mutex);
314 * ipath_diagpkt_write - write an IB packet
315 * @fp: the diag data device file pointer
316 * @data: ipath_diag_pkt structure saying where to get the packet
317 * @count: size of data to write
318 * @off: unused by this code
320 static ssize_t ipath_diagpkt_write(struct file *fp,
321 const char __user *data,
322 size_t count, loff_t *off)
325 u32 plen, clen, pbufn;
326 struct ipath_diag_pkt odp;
327 struct ipath_diag_xpkt dp;
329 struct ipath_devdata *dd;
333 if (count != sizeof(dp)) {
338 if (copy_from_user(&dp, data, sizeof(dp))) {
344 * Due to padding/alignment issues (lessened with new struct)
345 * the old and new structs are the same length. We need to
346 * disambiguate them, which we can do because odp.len has never
347 * been less than the total of LRH+BTH+DETH so far, while
348 * dp.unit (same offset) unit is unlikely to get that high.
349 * Similarly, dp.data, the pointer to user at the same offset
350 * as odp.unit, is almost certainly at least one (512byte)page
351 * "above" NULL. The if-block below can be omitted if compatibility
352 * between a new driver and older diagnostic code is unimportant.
353 * compatibility the other direction (new diags, old driver) is
354 * handled in the diagnostic code, with a warning.
356 if (dp.unit >= 20 && dp.data < 512) {
357 /* very probable version mismatch. Fix it up */
358 memcpy(&odp, &dp, sizeof(odp));
359 /* We got a legacy dp, copy elements to dp */
363 dp.pbc_wd = 0; /* Indicate we need to compute PBC wd */
366 /* send count must be an exact number of dwords */
374 dd = ipath_lookup(dp.unit);
375 if (!dd || !(dd->ipath_flags & IPATH_PRESENT) ||
376 !dd->ipath_kregbase) {
377 ipath_cdbg(VERBOSE, "illegal unit %u for diag data send\n",
383 if (ipath_diag_inuse && !diag_set_link &&
384 !(dd->ipath_flags & IPATH_LINKACTIVE)) {
386 ipath_cdbg(VERBOSE, "Trying to set to set link active for "
388 ipath_set_linkstate(dd, IPATH_IB_LINKARM);
389 ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE);
392 if (!(dd->ipath_flags & IPATH_INITTED)) {
393 /* no hardware, freeze, etc. */
394 ipath_cdbg(VERBOSE, "unit %u not usable\n", dd->ipath_unit);
398 /* Check link state, but not if we have custom PBC */
399 val = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
400 if (!dp.pbc_wd && val != IPATH_IBSTATE_INIT &&
401 val != IPATH_IBSTATE_ARM && val != IPATH_IBSTATE_ACTIVE) {
402 ipath_cdbg(VERBOSE, "unit %u not ready (state %llx)\n",
403 dd->ipath_unit, (unsigned long long) val);
408 /* need total length before first word written */
409 /* +1 word is for the qword padding */
410 plen = sizeof(u32) + dp.len;
412 if ((plen + 4) > dd->ipath_ibmaxlen) {
413 ipath_dbg("Pkt len 0x%x > ibmaxlen %x\n",
414 plen - 4, dd->ipath_ibmaxlen);
416 goto bail; /* before writing pbc */
418 tmpbuf = vmalloc(plen);
420 dev_info(&dd->pcidev->dev, "Unable to allocate tmp buffer, "
426 if (copy_from_user(tmpbuf,
427 (const void __user *) (unsigned long) dp.data,
433 piobuf = ipath_getpiobuf(dd, &pbufn);
435 ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n",
441 plen >>= 2; /* in dwords */
443 if (ipath_debug & __IPATH_PKTDBG)
444 ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n",
445 dd->ipath_unit, plen - 1, pbufn);
448 /* Legacy operation, use computed pbc_wd */
451 /* we have to flush after the PBC for correctness on some cpus
452 * or WC buffer can be written out of order */
453 writeq(dp.pbc_wd, piobuf);
455 /* copy all by the trigger word, then flush, so it's written
456 * to chip before trigger word, then write trigger word, then
457 * flush again, so packet is sent. */
458 __iowrite32_copy(piobuf + 2, tmpbuf, clen - 1);
460 __raw_writel(tmpbuf[clen - 1], piobuf + clen + 1);
470 static int ipath_diag_release(struct inode *in, struct file *fp)
472 mutex_lock(&ipath_mutex);
473 ipath_diag_inuse = 0;
474 fp->private_data = NULL;
475 mutex_unlock(&ipath_mutex);
479 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
480 size_t count, loff_t *off)
482 struct ipath_devdata *dd = fp->private_data;
483 void __iomem *kreg_base;
486 kreg_base = dd->ipath_kregbase;
490 else if ((count % 4) || (*off % 4))
491 /* address or length is not 32-bit aligned, hence invalid */
493 else if (ipath_diag_inuse < 1 && (*off || count != 8))
494 ret = -EINVAL; /* prevent cat /dev/ipath_diag* */
495 else if ((count % 8) || (*off % 8))
496 /* address or length not 64-bit aligned; do 32-bit reads */
497 ret = ipath_read_umem32(dd, data, kreg_base + *off, count);
499 ret = ipath_read_umem64(dd, data, kreg_base + *off, count);
504 if (ipath_diag_inuse == -2)
511 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
512 size_t count, loff_t *off)
514 struct ipath_devdata *dd = fp->private_data;
515 void __iomem *kreg_base;
518 kreg_base = dd->ipath_kregbase;
522 else if ((count % 4) || (*off % 4))
523 /* address or length is not 32-bit aligned, hence invalid */
525 else if ((ipath_diag_inuse == -1 && (*off || count != 8)) ||
526 ipath_diag_inuse == -2) /* read qw off 0, write qw off 0 */
527 ret = -EINVAL; /* before any other write allowed */
528 else if ((count % 8) || (*off % 8))
529 /* address or length not 64-bit aligned; do 32-bit writes */
530 ret = ipath_write_umem32(dd, kreg_base + *off, data, count);
532 ret = ipath_write_umem64(dd, kreg_base + *off, data, count);
537 if (ipath_diag_inuse == -1)
538 ipath_diag_inuse = 1; /* all read/write OK now */