2 * Copyright (c) 2006 QLogic, Inc. 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 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 int ipath_diag_add(struct ipath_devdata *dd)
74 snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit);
76 return ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
77 &diag_file_ops, &dd->diag_cdev,
81 void ipath_diag_remove(struct ipath_devdata *dd)
83 ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_class_dev);
87 * ipath_read_umem64 - read a 64-bit quantity from the chip into user space
88 * @dd: the infinipath device
89 * @uaddr: the location to store the data in user memory
90 * @caddr: the source chip address (full pointer, not offset)
91 * @count: number of bytes to copy (multiple of 32 bits)
93 * This function also localizes all chip memory accesses.
94 * The copy should be written such that we read full cacheline packets
95 * from the chip. This is usually used for a single qword
97 * NOTE: This assumes the chip address is 64-bit aligned.
99 static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr,
100 const void __iomem *caddr, size_t count)
102 const u64 __iomem *reg_addr = caddr;
103 const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
106 /* not very efficient, but it works for now */
107 if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
111 while (reg_addr < reg_end) {
112 u64 data = readq(reg_addr);
113 if (copy_to_user(uaddr, &data, sizeof(u64))) {
118 uaddr += sizeof(u64);
126 * ipath_write_umem64 - write a 64-bit quantity to the chip from user space
127 * @dd: the infinipath device
128 * @caddr: the destination chip address (full pointer, not offset)
129 * @uaddr: the source of the data in user memory
130 * @count: the number of bytes to copy (multiple of 32 bits)
132 * This is usually used for a single qword
133 * NOTE: This assumes the chip address is 64-bit aligned.
136 static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr,
137 const void __user *uaddr, size_t count)
139 u64 __iomem *reg_addr = caddr;
140 const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
143 /* not very efficient, but it works for now */
144 if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
148 while (reg_addr < reg_end) {
150 if (copy_from_user(&data, uaddr, sizeof(data))) {
154 writeq(data, reg_addr);
157 uaddr += sizeof(u64);
165 * ipath_read_umem32 - read a 32-bit quantity from the chip into user space
166 * @dd: the infinipath device
167 * @uaddr: the location to store the data in user memory
168 * @caddr: the source chip address (full pointer, not offset)
169 * @count: number of bytes to copy
171 * read 32 bit values, not 64 bit; for memories that only
172 * support 32 bit reads; usually a single dword.
174 static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr,
175 const void __iomem *caddr, size_t count)
177 const u32 __iomem *reg_addr = caddr;
178 const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
181 if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
182 reg_end > (u32 __iomem *) dd->ipath_kregend) {
186 /* not very efficient, but it works for now */
187 while (reg_addr < reg_end) {
188 u32 data = readl(reg_addr);
189 if (copy_to_user(uaddr, &data, sizeof(data))) {
195 uaddr += sizeof(u32);
204 * ipath_write_umem32 - write a 32-bit quantity to the chip from user space
205 * @dd: the infinipath device
206 * @caddr: the destination chip address (full pointer, not offset)
207 * @uaddr: the source of the data in user memory
208 * @count: number of bytes to copy
210 * write 32 bit values, not 64 bit; for memories that only
211 * support 32 bit write; usually a single dword.
214 static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr,
215 const void __user *uaddr, size_t count)
217 u32 __iomem *reg_addr = caddr;
218 const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
221 if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
222 reg_end > (u32 __iomem *) dd->ipath_kregend) {
226 while (reg_addr < reg_end) {
228 if (copy_from_user(&data, uaddr, sizeof(data))) {
232 writel(data, reg_addr);
235 uaddr += sizeof(u32);
242 static int ipath_diag_open(struct inode *in, struct file *fp)
244 int unit = iminor(in) - IPATH_DIAG_MINOR_BASE;
245 struct ipath_devdata *dd;
248 mutex_lock(&ipath_mutex);
250 if (ipath_diag_inuse) {
255 dd = ipath_lookup(unit);
257 if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) ||
258 !dd->ipath_kregbase) {
263 fp->private_data = dd;
264 ipath_diag_inuse = 1;
268 /* Only expose a way to reset the device if we
269 make it into diag mode. */
270 ipath_expose_reset(&dd->pcidev->dev);
273 mutex_unlock(&ipath_mutex);
278 static ssize_t ipath_diagpkt_write(struct file *fp,
279 const char __user *data,
280 size_t count, loff_t *off);
282 static struct file_operations diagpkt_file_ops = {
283 .owner = THIS_MODULE,
284 .write = ipath_diagpkt_write,
287 static struct cdev *diagpkt_cdev;
288 static struct class_device *diagpkt_class_dev;
290 int __init ipath_diagpkt_add(void)
292 return ipath_cdev_init(IPATH_DIAGPKT_MINOR,
293 "ipath_diagpkt", &diagpkt_file_ops,
294 &diagpkt_cdev, &diagpkt_class_dev);
297 void __exit ipath_diagpkt_remove(void)
299 ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_class_dev);
303 * ipath_diagpkt_write - write an IB packet
304 * @fp: the diag data device file pointer
305 * @data: ipath_diag_pkt structure saying where to get the packet
306 * @count: size of data to write
307 * @off: unused by this code
309 static ssize_t ipath_diagpkt_write(struct file *fp,
310 const char __user *data,
311 size_t count, loff_t *off)
314 u32 plen, clen, pbufn;
315 struct ipath_diag_pkt dp;
317 struct ipath_devdata *dd;
321 if (count < sizeof(dp)) {
326 if (copy_from_user(&dp, data, sizeof(dp))) {
331 /* send count must be an exact number of dwords */
339 dd = ipath_lookup(dp.unit);
340 if (!dd || !(dd->ipath_flags & IPATH_PRESENT) ||
341 !dd->ipath_kregbase) {
342 ipath_cdbg(VERBOSE, "illegal unit %u for diag data send\n",
348 if (ipath_diag_inuse && !diag_set_link &&
349 !(dd->ipath_flags & IPATH_LINKACTIVE)) {
351 ipath_cdbg(VERBOSE, "Trying to set to set link active for "
353 ipath_set_linkstate(dd, IPATH_IB_LINKARM);
354 ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE);
357 if (!(dd->ipath_flags & IPATH_INITTED)) {
358 /* no hardware, freeze, etc. */
359 ipath_cdbg(VERBOSE, "unit %u not usable\n", dd->ipath_unit);
363 val = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
364 if (val != IPATH_IBSTATE_INIT && val != IPATH_IBSTATE_ARM &&
365 val != IPATH_IBSTATE_ACTIVE) {
366 ipath_cdbg(VERBOSE, "unit %u not ready (state %llx)\n",
367 dd->ipath_unit, (unsigned long long) val);
372 /* need total length before first word written */
373 /* +1 word is for the qword padding */
374 plen = sizeof(u32) + dp.len;
376 if ((plen + 4) > dd->ipath_ibmaxlen) {
377 ipath_dbg("Pkt len 0x%x > ibmaxlen %x\n",
378 plen - 4, dd->ipath_ibmaxlen);
380 goto bail; /* before writing pbc */
382 tmpbuf = vmalloc(plen);
384 dev_info(&dd->pcidev->dev, "Unable to allocate tmp buffer, "
390 if (copy_from_user(tmpbuf,
391 (const void __user *) (unsigned long) dp.data,
397 piobuf = ipath_getpiobuf(dd, &pbufn);
399 ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n",
405 plen >>= 2; /* in dwords */
407 if (ipath_debug & __IPATH_PKTDBG)
408 ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n",
409 dd->ipath_unit, plen - 1, pbufn);
411 /* we have to flush after the PBC for correctness on some cpus
412 * or WC buffer can be written out of order */
413 writeq(plen, piobuf);
415 /* copy all by the trigger word, then flush, so it's written
416 * to chip before trigger word, then write trigger word, then
417 * flush again, so packet is sent. */
418 __iowrite32_copy(piobuf + 2, tmpbuf, clen - 1);
420 __raw_writel(tmpbuf[clen - 1], piobuf + clen + 1);
430 static int ipath_diag_release(struct inode *in, struct file *fp)
432 mutex_lock(&ipath_mutex);
433 ipath_diag_inuse = 0;
434 fp->private_data = NULL;
435 mutex_unlock(&ipath_mutex);
439 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
440 size_t count, loff_t *off)
442 struct ipath_devdata *dd = fp->private_data;
443 void __iomem *kreg_base;
446 kreg_base = dd->ipath_kregbase;
450 else if ((count % 4) || (*off % 4))
451 /* address or length is not 32-bit aligned, hence invalid */
453 else if ((count % 8) || (*off % 8))
454 /* address or length not 64-bit aligned; do 32-bit reads */
455 ret = ipath_read_umem32(dd, data, kreg_base + *off, count);
457 ret = ipath_read_umem64(dd, data, kreg_base + *off, count);
467 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
468 size_t count, loff_t *off)
470 struct ipath_devdata *dd = fp->private_data;
471 void __iomem *kreg_base;
474 kreg_base = dd->ipath_kregbase;
478 else if ((count % 4) || (*off % 4))
479 /* address or length is not 32-bit aligned, hence invalid */
481 else if ((count % 8) || (*off % 8))
482 /* address or length not 64-bit aligned; do 32-bit writes */
483 ret = ipath_write_umem32(dd, kreg_base + *off, data, count);
485 ret = ipath_write_umem64(dd, kreg_base + *off, data, count);