drivers/infiniband/hw/ipath/ipath_diag.c

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. All rights reserved.
   3  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   4  *
   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:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  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.
  23  *
  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
  31  * SOFTWARE.
  32  */
  33
  34 /*
  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.
  39  *
  40  * Accesses to the chip through this interface are not similar to going
  41  * through the /sys/bus/pci resource mmap interface.
  42  */
  43
  44 #include <linux/pci.h>
  45 #include <asm/uaccess.h>
  46
  47 #include "ipath_kernel.h"
  48 #include "ipath_layer.h"
  49 #include "ipath_common.h"
  50
  51 int ipath_diag_inuse;
  52 static int diag_set_link;
  53
  54 static int ipath_diag_open(struct inode *in, struct file *fp);
  55 static int ipath_diag_release(struct inode *in, struct file *fp);
  56 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
  57                                size_t count, loff_t *off);
  58 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
  59                                 size_t count, loff_t *off);
  60
  61 static struct file_operations diag_file_ops = {
  62         .owner = THIS_MODULE,
  63         .write = ipath_diag_write,
  64         .read = ipath_diag_read,
  65         .open = ipath_diag_open,
  66         .release = ipath_diag_release
  67 };
  68
  69 int ipath_diag_add(struct ipath_devdata *dd)
  70 {
  71         char name[16];
  72
  73         snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit);
  74
  75         return ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
  76                                &diag_file_ops, &dd->diag_cdev,
  77                                &dd->diag_class_dev);
  78 }
  79
  80 void ipath_diag_remove(struct ipath_devdata *dd)
  81 {
  82         ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_class_dev);
  83 }
  84
  85 /**
  86  * ipath_read_umem64 - read a 64-bit quantity from the chip into user space
  87  * @dd: the infinipath device
  88  * @uaddr: the location to store the data in user memory
  89  * @caddr: the source chip address (full pointer, not offset)
  90  * @count: number of bytes to copy (multiple of 32 bits)
  91  *
  92  * This function also localizes all chip memory accesses.
  93  * The copy should be written such that we read full cacheline packets
  94  * from the chip.  This is usually used for a single qword
  95  *
  96  * NOTE:  This assumes the chip address is 64-bit aligned.
  97  */
  98 static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr,
  99                              const void __iomem *caddr, size_t count)
 100 {
 101         const u64 __iomem *reg_addr = caddr;
 102         const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
 103         int ret;
 104
 105         /* not very efficient, but it works for now */
 106         if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
 107                 ret = -EINVAL;
 108                 goto bail;
 109         }
 110         while (reg_addr < reg_end) {
 111                 u64 data = readq(reg_addr);
 112                 if (copy_to_user(uaddr, &data, sizeof(u64))) {
 113                         ret = -EFAULT;
 114                         goto bail;
 115                 }
 116                 reg_addr++;
 117                 uaddr += sizeof(u64);
 118         }
 119         ret = 0;
 120 bail:
 121         return ret;
 122 }
 123
 124 /**
 125  * ipath_write_umem64 - write a 64-bit quantity to the chip from user space
 126  * @dd: the infinipath device
 127  * @caddr: the destination chip address (full pointer, not offset)
 128  * @uaddr: the source of the data in user memory
 129  * @count: the number of bytes to copy (multiple of 32 bits)
 130  *
 131  * This is usually used for a single qword
 132  * NOTE:  This assumes the chip address is 64-bit aligned.
 133  */
 134
 135 static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr,
 136                               const void __user *uaddr, size_t count)
 137 {
 138         u64 __iomem *reg_addr = caddr;
 139         const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
 140         int ret;
 141
 142         /* not very efficient, but it works for now */
 143         if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
 144                 ret = -EINVAL;
 145                 goto bail;
 146         }
 147         while (reg_addr < reg_end) {
 148                 u64 data;
 149                 if (copy_from_user(&data, uaddr, sizeof(data))) {
 150                         ret = -EFAULT;
 151                         goto bail;
 152                 }
 153                 writeq(data, reg_addr);
 154
 155                 reg_addr++;
 156                 uaddr += sizeof(u64);
 157         }
 158         ret = 0;
 159 bail:
 160         return ret;
 161 }
 162
 163 /**
 164  * ipath_read_umem32 - read a 32-bit quantity from the chip into user space
 165  * @dd: the infinipath device
 166  * @uaddr: the location to store the data in user memory
 167  * @caddr: the source chip address (full pointer, not offset)
 168  * @count: number of bytes to copy
 169  *
 170  * read 32 bit values, not 64 bit; for memories that only
 171  * support 32 bit reads; usually a single dword.
 172  */
 173 static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr,
 174                              const void __iomem *caddr, size_t count)
 175 {
 176         const u32 __iomem *reg_addr = caddr;
 177         const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
 178         int ret;
 179
 180         if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
 181             reg_end > (u32 __iomem *) dd->ipath_kregend) {
 182                 ret = -EINVAL;
 183                 goto bail;
 184         }
 185         /* not very efficient, but it works for now */
 186         while (reg_addr < reg_end) {
 187                 u32 data = readl(reg_addr);
 188                 if (copy_to_user(uaddr, &data, sizeof(data))) {
 189                         ret = -EFAULT;
 190                         goto bail;
 191                 }
 192
 193                 reg_addr++;
 194                 uaddr += sizeof(u32);
 195
 196         }
 197         ret = 0;
 198 bail:
 199         return ret;
 200 }
 201
 202 /**
 203  * ipath_write_umem32 - write a 32-bit quantity to the chip from user space
 204  * @dd: the infinipath device
 205  * @caddr: the destination chip address (full pointer, not offset)
 206  * @uaddr: the source of the data in user memory
 207  * @count: number of bytes to copy
 208  *
 209  * write 32 bit values, not 64 bit; for memories that only
 210  * support 32 bit write; usually a single dword.
 211  */
 212
 213 static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr,
 214                               const void __user *uaddr, size_t count)
 215 {
 216         u32 __iomem *reg_addr = caddr;
 217         const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
 218         int ret;
 219
 220         if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
 221             reg_end > (u32 __iomem *) dd->ipath_kregend) {
 222                 ret = -EINVAL;
 223                 goto bail;
 224         }
 225         while (reg_addr < reg_end) {
 226                 u32 data;
 227                 if (copy_from_user(&data, uaddr, sizeof(data))) {
 228                         ret = -EFAULT;
 229                         goto bail;
 230                 }
 231                 writel(data, reg_addr);
 232
 233                 reg_addr++;
 234                 uaddr += sizeof(u32);
 235         }
 236         ret = 0;
 237 bail:
 238         return ret;
 239 }
 240
 241 static int ipath_diag_open(struct inode *in, struct file *fp)
 242 {
 243         int unit = iminor(in) - IPATH_DIAG_MINOR_BASE;
 244         struct ipath_devdata *dd;
 245         int ret;
 246
 247         mutex_lock(&ipath_mutex);
 248
 249         if (ipath_diag_inuse) {
 250                 ret = -EBUSY;
 251                 goto bail;
 252         }
 253
 254         dd = ipath_lookup(unit);
 255
 256         if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) ||
 257             !dd->ipath_kregbase) {
 258                 ret = -ENODEV;
 259                 goto bail;
 260         }
 261
 262         fp->private_data = dd;
 263         ipath_diag_inuse = 1;
 264         diag_set_link = 0;
 265         ret = 0;
 266
 267         /* Only expose a way to reset the device if we
 268            make it into diag mode. */
 269         ipath_expose_reset(&dd->pcidev->dev);
 270
 271 bail:
 272         mutex_unlock(&ipath_mutex);
 273
 274         return ret;
 275 }
 276
 277 static int ipath_diag_release(struct inode *in, struct file *fp)
 278 {
 279         mutex_lock(&ipath_mutex);
 280         ipath_diag_inuse = 0;
 281         fp->private_data = NULL;
 282         mutex_unlock(&ipath_mutex);
 283         return 0;
 284 }
 285
 286 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
 287                                size_t count, loff_t *off)
 288 {
 289         struct ipath_devdata *dd = fp->private_data;
 290         void __iomem *kreg_base;
 291         ssize_t ret;
 292
 293         kreg_base = dd->ipath_kregbase;
 294
 295         if (count == 0)
 296                 ret = 0;
 297         else if ((count % 4) || (*off % 4))
 298                 /* address or length is not 32-bit aligned, hence invalid */
 299                 ret = -EINVAL;
 300         else if ((count % 8) || (*off % 8))
 301                 /* address or length not 64-bit aligned; do 32-bit reads */
 302                 ret = ipath_read_umem32(dd, data, kreg_base + *off, count);
 303         else
 304                 ret = ipath_read_umem64(dd, data, kreg_base + *off, count);
 305
 306         if (ret >= 0) {
 307                 *off += count;
 308                 ret = count;
 309         }
 310
 311         return ret;
 312 }
 313
 314 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
 315                                 size_t count, loff_t *off)
 316 {
 317         struct ipath_devdata *dd = fp->private_data;
 318         void __iomem *kreg_base;
 319         ssize_t ret;
 320
 321         kreg_base = dd->ipath_kregbase;
 322
 323         if (count == 0)
 324                 ret = 0;
 325         else if ((count % 4) || (*off % 4))
 326                 /* address or length is not 32-bit aligned, hence invalid */
 327                 ret = -EINVAL;
 328         else if ((count % 8) || (*off % 8))
 329                 /* address or length not 64-bit aligned; do 32-bit writes */
 330                 ret = ipath_write_umem32(dd, kreg_base + *off, data, count);
 331         else
 332                 ret = ipath_write_umem64(dd, kreg_base + *off, data, count);
 333
 334         if (ret >= 0) {
 335                 *off += count;
 336                 ret = count;
 337         }
 338
 339         return ret;
 340 }