arch/parisc/kernel/perf.c

   1 /*
   2  *  Parisc performance counters
   3  *  Copyright (C) 2001 Randolph Chung <tausq@debian.org>
   4  *
   5  *  This code is derived, with permission, from HP/UX sources.
   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 as published by
   9  *    the Free Software Foundation; either version 2, or (at your option)
  10  *    any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 /*
  23  *  Edited comment from original sources:
  24  *
  25  *  This driver programs the PCX-U/PCX-W performance counters
  26  *  on the PA-RISC 2.0 chips.  The driver keeps all images now
  27  *  internally to the kernel to hopefully eliminate the possibility
  28  *  of a bad image halting the CPU.  Also, there are different
  29  *  images for the PCX-W and later chips vs the PCX-U chips.
  30  *
  31  *  Only 1 process is allowed to access the driver at any time,
  32  *  so the only protection that is needed is at open and close.
  33  *  A variable "perf_enabled" is used to hold the state of the
  34  *  driver.  The spinlock "perf_lock" is used to protect the
  35  *  modification of the state during open/close operations so
  36  *  multiple processes don't get into the driver simultaneously.
  37  *
  38  *  This driver accesses the processor directly vs going through
  39  *  the PDC INTRIGUE calls.  This is done to eliminate bugs introduced
  40  *  in various PDC revisions.  The code is much more maintainable
  41  *  and reliable this way vs having to debug on every version of PDC
  42  *  on every box.
  43  */
  44
  45 #include <linux/capability.h>
  46 #include <linux/init.h>
  47 #include <linux/proc_fs.h>
  48 #include <linux/miscdevice.h>
  49 #include <linux/spinlock.h>
  50
  51 #include <asm/uaccess.h>
  52 #include <asm/perf.h>
  53 #include <asm/parisc-device.h>
  54 #include <asm/processor.h>
  55 #include <asm/runway.h>
  56 #include <asm/io.h>             /* for __raw_read() */
  57
  58 #include "perf_images.h"
  59
  60 #define MAX_RDR_WORDS   24
  61 #define PERF_VERSION    2       /* derived from hpux's PI v2 interface */
  62
  63 /* definition of RDR regs */
  64 struct rdr_tbl_ent {
  65         uint16_t        width;
  66         uint8_t         num_words;
  67         uint8_t         write_control;
  68 };
  69
  70 static int perf_processor_interface __read_mostly = UNKNOWN_INTF;
  71 static int perf_enabled __read_mostly;
  72 static spinlock_t perf_lock;
  73 struct parisc_device *cpu_device __read_mostly;
  74
  75 /* RDRs to write for PCX-W */
  76 static const int perf_rdrs_W[] =
  77         { 0, 1, 4, 5, 6, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, -1 };
  78
  79 /* RDRs to write for PCX-U */
  80 static const int perf_rdrs_U[] =
  81         { 0, 1, 4, 5, 6, 7, 16, 17, 18, 20, 21, 22, 23, 24, 25, -1 };
  82
  83 /* RDR register descriptions for PCX-W */
  84 static const struct rdr_tbl_ent perf_rdr_tbl_W[] = {
  85         { 19,   1,      8 },   /* RDR 0 */
  86         { 16,   1,      16 },  /* RDR 1 */
  87         { 72,   2,      0 },   /* RDR 2 */
  88         { 81,   2,      0 },   /* RDR 3 */
  89         { 328,  6,      0 },   /* RDR 4 */
  90         { 160,  3,      0 },   /* RDR 5 */
  91         { 336,  6,      0 },   /* RDR 6 */
  92         { 164,  3,      0 },   /* RDR 7 */
  93         { 0,    0,      0 },   /* RDR 8 */
  94         { 35,   1,      0 },   /* RDR 9 */
  95         { 6,    1,      0 },   /* RDR 10 */
  96         { 18,   1,      0 },   /* RDR 11 */
  97         { 13,   1,      0 },   /* RDR 12 */
  98         { 8,    1,      0 },   /* RDR 13 */
  99         { 8,    1,      0 },   /* RDR 14 */
 100         { 8,    1,      0 },   /* RDR 15 */
 101         { 1530, 24,     0 },   /* RDR 16 */
 102         { 16,   1,      0 },   /* RDR 17 */
 103         { 4,    1,      0 },   /* RDR 18 */
 104         { 0,    0,      0 },   /* RDR 19 */
 105         { 152,  3,      24 },  /* RDR 20 */
 106         { 152,  3,      24 },  /* RDR 21 */
 107         { 233,  4,      48 },  /* RDR 22 */
 108         { 233,  4,      48 },  /* RDR 23 */
 109         { 71,   2,      0 },   /* RDR 24 */
 110         { 71,   2,      0 },   /* RDR 25 */
 111         { 11,   1,      0 },   /* RDR 26 */
 112         { 18,   1,      0 },   /* RDR 27 */
 113         { 128,  2,      0 },   /* RDR 28 */
 114         { 0,    0,      0 },   /* RDR 29 */
 115         { 16,   1,      0 },   /* RDR 30 */
 116         { 16,   1,      0 },   /* RDR 31 */
 117 };
 118
 119 /* RDR register descriptions for PCX-U */
 120 static const struct rdr_tbl_ent perf_rdr_tbl_U[] = {
 121         { 19,   1,      8 },              /* RDR 0 */
 122         { 32,   1,      16 },             /* RDR 1 */
 123         { 20,   1,      0 },              /* RDR 2 */
 124         { 0,    0,      0 },              /* RDR 3 */
 125         { 344,  6,      0 },              /* RDR 4 */
 126         { 176,  3,      0 },              /* RDR 5 */
 127         { 336,  6,      0 },              /* RDR 6 */
 128         { 0,    0,      0 },              /* RDR 7 */
 129         { 0,    0,      0 },              /* RDR 8 */
 130         { 0,    0,      0 },              /* RDR 9 */
 131         { 28,   1,      0 },              /* RDR 10 */
 132         { 33,   1,      0 },              /* RDR 11 */
 133         { 0,    0,      0 },              /* RDR 12 */
 134         { 230,  4,      0 },              /* RDR 13 */
 135         { 32,   1,      0 },              /* RDR 14 */
 136         { 128,  2,      0 },              /* RDR 15 */
 137         { 1494, 24,     0 },              /* RDR 16 */
 138         { 18,   1,      0 },              /* RDR 17 */
 139         { 4,    1,      0 },              /* RDR 18 */
 140         { 0,    0,      0 },              /* RDR 19 */
 141         { 158,  3,      24 },             /* RDR 20 */
 142         { 158,  3,      24 },             /* RDR 21 */
 143         { 194,  4,      48 },             /* RDR 22 */
 144         { 194,  4,      48 },             /* RDR 23 */
 145         { 71,   2,      0 },              /* RDR 24 */
 146         { 71,   2,      0 },              /* RDR 25 */
 147         { 28,   1,      0 },              /* RDR 26 */
 148         { 33,   1,      0 },              /* RDR 27 */
 149         { 88,   2,      0 },              /* RDR 28 */
 150         { 32,   1,      0 },              /* RDR 29 */
 151         { 24,   1,      0 },              /* RDR 30 */
 152         { 16,   1,      0 },              /* RDR 31 */
 153 };
 154
 155 /*
 156  * A non-zero write_control in the above tables is a byte offset into
 157  * this array.
 158  */
 159 static const uint64_t perf_bitmasks[] = {
 160         0x0000000000000000ul,     /* first dbl word must be zero */
 161         0xfdffe00000000000ul,     /* RDR0 bitmask */
 162         0x003f000000000000ul,     /* RDR1 bitmask */
 163         0x00fffffffffffffful,     /* RDR20-RDR21 bitmask (152 bits) */
 164         0xfffffffffffffffful,
 165         0xfffffffc00000000ul,
 166         0xfffffffffffffffful,     /* RDR22-RDR23 bitmask (233 bits) */
 167         0xfffffffffffffffful,
 168         0xfffffffffffffffcul,
 169         0xff00000000000000ul
 170 };
 171
 172 /*
 173  * Write control bitmasks for Pa-8700 processor given
 174  * some things have changed slightly.
 175  */
 176 static const uint64_t perf_bitmasks_piranha[] = {
 177         0x0000000000000000ul,     /* first dbl word must be zero */
 178         0xfdffe00000000000ul,     /* RDR0 bitmask */
 179         0x003f000000000000ul,     /* RDR1 bitmask */
 180         0x00fffffffffffffful,     /* RDR20-RDR21 bitmask (158 bits) */
 181         0xfffffffffffffffful,
 182         0xfffffffc00000000ul,
 183         0xfffffffffffffffful,     /* RDR22-RDR23 bitmask (210 bits) */
 184         0xfffffffffffffffful,
 185         0xfffffffffffffffful,
 186         0xfffc000000000000ul
 187 };
 188
 189 static const uint64_t *bitmask_array;   /* array of bitmasks to use */
 190
 191 /******************************************************************************
 192  * Function Prototypes
 193  *****************************************************************************/
 194 static int perf_config(uint32_t *image_ptr);
 195 static int perf_release(struct inode *inode, struct file *file);
 196 static int perf_open(struct inode *inode, struct file *file);
 197 static ssize_t perf_read(struct file *file, char __user *buf, size_t cnt, loff_t *ppos);
 198 static ssize_t perf_write(struct file *file, const char __user *buf, size_t count,
 199         loff_t *ppos);
 200 static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 201 static void perf_start_counters(void);
 202 static int perf_stop_counters(uint32_t *raddr);
 203 static const struct rdr_tbl_ent * perf_rdr_get_entry(uint32_t rdr_num);
 204 static int perf_rdr_read_ubuf(uint32_t  rdr_num, uint64_t *buffer);
 205 static int perf_rdr_clear(uint32_t rdr_num);
 206 static int perf_write_image(uint64_t *memaddr);
 207 static void perf_rdr_write(uint32_t rdr_num, uint64_t *buffer);
 208
 209 /* External Assembly Routines */
 210 extern uint64_t perf_rdr_shift_in_W (uint32_t rdr_num, uint16_t width);
 211 extern uint64_t perf_rdr_shift_in_U (uint32_t rdr_num, uint16_t width);
 212 extern void perf_rdr_shift_out_W (uint32_t rdr_num, uint64_t buffer);
 213 extern void perf_rdr_shift_out_U (uint32_t rdr_num, uint64_t buffer);
 214 extern void perf_intrigue_enable_perf_counters (void);
 215 extern void perf_intrigue_disable_perf_counters (void);
 216
 217 /******************************************************************************
 218  * Function Definitions
 219  *****************************************************************************/
 220
 221
 222 /*
 223  * configure:
 224  *
 225  * Configure the cpu with a given data image.  First turn off the counters,
 226  * then download the image, then turn the counters back on.
 227  */
 228 static int perf_config(uint32_t *image_ptr)
 229 {
 230         long error;
 231         uint32_t raddr[4];
 232
 233         /* Stop the counters*/
 234         error = perf_stop_counters(raddr);
 235         if (error != 0) {
 236                 printk("perf_config: perf_stop_counters = %ld\n", error);
 237                 return -EINVAL;
 238         }
 239
 240 printk("Preparing to write image\n");
 241         /* Write the image to the chip */
 242         error = perf_write_image((uint64_t *)image_ptr);
 243         if (error != 0) {
 244                 printk("perf_config: DOWNLOAD = %ld\n", error);
 245                 return -EINVAL;
 246         }
 247
 248 printk("Preparing to start counters\n");
 249
 250         /* Start the counters */
 251         perf_start_counters();
 252
 253         return sizeof(uint32_t);
 254 }
 255
 256 /*
 257  * Open the device and initialize all of its memory.  The device is only
 258  * opened once, but can be "queried" by multiple processes that know its
 259  * file descriptor.
 260  */
 261 static int perf_open(struct inode *inode, struct file *file)
 262 {
 263         spin_lock(&perf_lock);
 264         if (perf_enabled) {
 265                 spin_unlock(&perf_lock);
 266                 return -EBUSY;
 267         }
 268         perf_enabled = 1;
 269         spin_unlock(&perf_lock);
 270
 271         return 0;
 272 }
 273
 274 /*
 275  * Close the device.
 276  */
 277 static int perf_release(struct inode *inode, struct file *file)
 278 {
 279         spin_lock(&perf_lock);
 280         perf_enabled = 0;
 281         spin_unlock(&perf_lock);
 282
 283         return 0;
 284 }
 285
 286 /*
 287  * Read does nothing for this driver
 288  */
 289 static ssize_t perf_read(struct file *file, char __user *buf, size_t cnt, loff_t *ppos)
 290 {
 291         return 0;
 292 }
 293
 294 /*
 295  * write:
 296  *
 297  * This routine downloads the image to the chip.  It must be
 298  * called on the processor that the download should happen
 299  * on.
 300  */
 301 static ssize_t perf_write(struct file *file, const char __user *buf, size_t count,
 302         loff_t *ppos)
 303 {
 304         int err;
 305         size_t image_size;
 306         uint32_t image_type;
 307         uint32_t interface_type;
 308         uint32_t test;
 309
 310         if (perf_processor_interface == ONYX_INTF)
 311                 image_size = PCXU_IMAGE_SIZE;
 312         else if (perf_processor_interface == CUDA_INTF)
 313                 image_size = PCXW_IMAGE_SIZE;
 314         else
 315                 return -EFAULT;
 316
 317         if (!capable(CAP_SYS_ADMIN))
 318                 return -EACCES;
 319
 320         if (count != sizeof(uint32_t))
 321                 return -EIO;
 322
 323         if ((err = copy_from_user(&image_type, buf, sizeof(uint32_t))) != 0)
 324                 return err;
 325
 326         /* Get the interface type and test type */
 327         interface_type = (image_type >> 16) & 0xffff;
 328         test           = (image_type & 0xffff);
 329
 330         /* Make sure everything makes sense */
 331
 332         /* First check the machine type is correct for
 333            the requested image */
 334         if (((perf_processor_interface == CUDA_INTF) &&
 335                        (interface_type != CUDA_INTF)) ||
 336             ((perf_processor_interface == ONYX_INTF) &&
 337                        (interface_type != ONYX_INTF)))
 338                 return -EINVAL;
 339
 340         /* Next check to make sure the requested image
 341            is valid */
 342         if (((interface_type == CUDA_INTF) &&
 343                        (test >= MAX_CUDA_IMAGES)) ||
 344             ((interface_type == ONYX_INTF) &&
 345                        (test >= MAX_ONYX_IMAGES)))
 346                 return -EINVAL;
 347
 348         /* Copy the image into the processor */
 349         if (interface_type == CUDA_INTF)
 350                 return perf_config(cuda_images[test]);
 351         else
 352                 return perf_config(onyx_images[test]);
 353
 354         return count;
 355 }
 356
 357 /*
 358  * Patch the images that need to know the IVA addresses.
 359  */
 360 static void perf_patch_images(void)
 361 {
 362 #if 0 /* FIXME!! */
 363 /*
 364  * NOTE:  this routine is VERY specific to the current TLB image.
 365  * If the image is changed, this routine might also need to be changed.
 366  */
 367         extern void $i_itlb_miss_2_0();
 368         extern void $i_dtlb_miss_2_0();
 369         extern void PA2_0_iva();
 370
 371         /*
 372          * We can only use the lower 32-bits, the upper 32-bits should be 0
 373          * anyway given this is in the kernel
 374          */
 375         uint32_t itlb_addr  = (uint32_t)&($i_itlb_miss_2_0);
 376         uint32_t dtlb_addr  = (uint32_t)&($i_dtlb_miss_2_0);
 377         uint32_t IVAaddress = (uint32_t)&PA2_0_iva;
 378
 379         if (perf_processor_interface == ONYX_INTF) {
 380                 /* clear last 2 bytes */
 381                 onyx_images[TLBMISS][15] &= 0xffffff00;
 382                 /* set 2 bytes */
 383                 onyx_images[TLBMISS][15] |= (0x000000ff&((dtlb_addr) >> 24));
 384                 onyx_images[TLBMISS][16] = (dtlb_addr << 8)&0xffffff00;
 385                 onyx_images[TLBMISS][17] = itlb_addr;
 386
 387                 /* clear last 2 bytes */
 388                 onyx_images[TLBHANDMISS][15] &= 0xffffff00;
 389                 /* set 2 bytes */
 390                 onyx_images[TLBHANDMISS][15] |= (0x000000ff&((dtlb_addr) >> 24));
 391                 onyx_images[TLBHANDMISS][16] = (dtlb_addr << 8)&0xffffff00;
 392                 onyx_images[TLBHANDMISS][17] = itlb_addr;
 393
 394                 /* clear last 2 bytes */
 395                 onyx_images[BIG_CPI][15] &= 0xffffff00;
 396                 /* set 2 bytes */
 397                 onyx_images[BIG_CPI][15] |= (0x000000ff&((dtlb_addr) >> 24));
 398                 onyx_images[BIG_CPI][16] = (dtlb_addr << 8)&0xffffff00;
 399                 onyx_images[BIG_CPI][17] = itlb_addr;
 400
 401             onyx_images[PANIC][15] &= 0xffffff00;  /* clear last 2 bytes */
 402                 onyx_images[PANIC][15] |= (0x000000ff&((IVAaddress) >> 24)); /* set 2 bytes */
 403                 onyx_images[PANIC][16] = (IVAaddress << 8)&0xffffff00;
 404
 405
 406         } else if (perf_processor_interface == CUDA_INTF) {
 407                 /* Cuda interface */
 408                 cuda_images[TLBMISS][16] =
 409                         (cuda_images[TLBMISS][16]&0xffff0000) |
 410                         ((dtlb_addr >> 8)&0x0000ffff);
 411                 cuda_images[TLBMISS][17] =
 412                         ((dtlb_addr << 24)&0xff000000) | ((itlb_addr >> 16)&0x000000ff);
 413                 cuda_images[TLBMISS][18] = (itlb_addr << 16)&0xffff0000;
 414
 415                 cuda_images[TLBHANDMISS][16] =
 416                         (cuda_images[TLBHANDMISS][16]&0xffff0000) |
 417                         ((dtlb_addr >> 8)&0x0000ffff);
 418                 cuda_images[TLBHANDMISS][17] =
 419                         ((dtlb_addr << 24)&0xff000000) | ((itlb_addr >> 16)&0x000000ff);
 420                 cuda_images[TLBHANDMISS][18] = (itlb_addr << 16)&0xffff0000;
 421
 422                 cuda_images[BIG_CPI][16] =
 423                         (cuda_images[BIG_CPI][16]&0xffff0000) |
 424                         ((dtlb_addr >> 8)&0x0000ffff);
 425                 cuda_images[BIG_CPI][17] =
 426                         ((dtlb_addr << 24)&0xff000000) | ((itlb_addr >> 16)&0x000000ff);
 427                 cuda_images[BIG_CPI][18] = (itlb_addr << 16)&0xffff0000;
 428         } else {
 429                 /* Unknown type */
 430         }
 431 #endif
 432 }
 433
 434
 435 /*
 436  * ioctl routine
 437  * All routines effect the processor that they are executed on.  Thus you
 438  * must be running on the processor that you wish to change.
 439  */
 440
 441 static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 442 {
 443         long error_start;
 444         uint32_t raddr[4];
 445         int error = 0;
 446
 447         switch (cmd) {
 448
 449             case PA_PERF_ON:
 450                         /* Start the counters */
 451                         perf_start_counters();
 452                         break;
 453
 454             case PA_PERF_OFF:
 455                         error_start = perf_stop_counters(raddr);
 456                         if (error_start != 0) {
 457                                 printk(KERN_ERR "perf_off: perf_stop_counters = %ld\n", error_start);
 458                                 error = -EFAULT;
 459                                 break;
 460                         }
 461
 462                         /* copy out the Counters */
 463                         if (copy_to_user((void __user *)arg, raddr,
 464                                         sizeof (raddr)) != 0) {
 465                                 error =  -EFAULT;
 466                                 break;
 467                         }
 468                         break;
 469
 470             case PA_PERF_VERSION:
 471                         /* Return the version # */
 472                         error = put_user(PERF_VERSION, (int *)arg);
 473                         break;
 474
 475             default:
 476                         error = -ENOTTY;
 477         }
 478
 479         return error;
 480 }
 481
 482 static const struct file_operations perf_fops = {
 483         .llseek = no_llseek,
 484         .read = perf_read,
 485         .write = perf_write,
 486         .unlocked_ioctl = perf_ioctl,
 487         .compat_ioctl = perf_ioctl,
 488         .open = perf_open,
 489         .release = perf_release
 490 };
 491
 492 static struct miscdevice perf_dev = {
 493         MISC_DYNAMIC_MINOR,
 494         PA_PERF_DEV,
 495         &perf_fops
 496 };
 497
 498 /*
 499  * Initialize the module
 500  */
 501 static int __init perf_init(void)
 502 {
 503         int ret;
 504
 505         /* Determine correct processor interface to use */
 506         bitmask_array = perf_bitmasks;
 507
 508         if (boot_cpu_data.cpu_type == pcxu ||
 509             boot_cpu_data.cpu_type == pcxu_) {
 510                 perf_processor_interface = ONYX_INTF;
 511         } else if (boot_cpu_data.cpu_type == pcxw ||
 512                  boot_cpu_data.cpu_type == pcxw_ ||
 513                  boot_cpu_data.cpu_type == pcxw2 ||
 514                  boot_cpu_data.cpu_type == mako ||
 515                  boot_cpu_data.cpu_type == mako2) {
 516                 perf_processor_interface = CUDA_INTF;
 517                 if (boot_cpu_data.cpu_type == pcxw2 ||
 518                     boot_cpu_data.cpu_type == mako ||
 519                     boot_cpu_data.cpu_type == mako2)
 520                         bitmask_array = perf_bitmasks_piranha;
 521         } else {
 522                 perf_processor_interface = UNKNOWN_INTF;
 523                 printk("Performance monitoring counters not supported on this processor\n");
 524                 return -ENODEV;
 525         }
 526
 527         ret = misc_register(&perf_dev);
 528         if (ret) {
 529                 printk(KERN_ERR "Performance monitoring counters: "
 530                         "cannot register misc device.\n");
 531                 return ret;
 532         }
 533
 534         /* Patch the images to match the system */
 535         perf_patch_images();
 536
 537         spin_lock_init(&perf_lock);
 538
 539         /* TODO: this only lets us access the first cpu.. what to do for SMP? */
 540         cpu_device = per_cpu(cpu_data, 0).dev;
 541         printk("Performance monitoring counters enabled for %s\n",
 542                 per_cpu(cpu_data, 0).dev->name);
 543
 544         return 0;
 545 }
 546
 547 /*
 548  * perf_start_counters(void)
 549  *
 550  * Start the counters.
 551  */
 552 static void perf_start_counters(void)
 553 {
 554         /* Enable performance monitor counters */
 555         perf_intrigue_enable_perf_counters();
 556 }
 557
 558 /*
 559  * perf_stop_counters
 560  *
 561  * Stop the performance counters and save counts
 562  * in a per_processor array.
 563  */
 564 static int perf_stop_counters(uint32_t *raddr)
 565 {
 566         uint64_t userbuf[MAX_RDR_WORDS];
 567
 568         /* Disable performance counters */
 569         perf_intrigue_disable_perf_counters();
 570
 571         if (perf_processor_interface == ONYX_INTF) {
 572                 uint64_t tmp64;
 573                 /*
 574                  * Read the counters
 575                  */
 576                 if (!perf_rdr_read_ubuf(16, userbuf))
 577                         return -13;
 578
 579                 /* Counter0 is bits 1398 to 1429 */
 580                 tmp64 =  (userbuf[21] << 22) & 0x00000000ffc00000;
 581                 tmp64 |= (userbuf[22] >> 42) & 0x00000000003fffff;
 582                 /* OR sticky0 (bit 1430) to counter0 bit 32 */
 583                 tmp64 |= (userbuf[22] >> 10) & 0x0000000080000000;
 584                 raddr[0] = (uint32_t)tmp64;
 585
 586                 /* Counter1 is bits 1431 to 1462 */
 587                 tmp64 =  (userbuf[22] >> 9) & 0x00000000ffffffff;
 588                 /* OR sticky1 (bit 1463) to counter1 bit 32 */
 589                 tmp64 |= (userbuf[22] << 23) & 0x0000000080000000;
 590                 raddr[1] = (uint32_t)tmp64;
 591
 592                 /* Counter2 is bits 1464 to 1495 */
 593                 tmp64 =  (userbuf[22] << 24) & 0x00000000ff000000;
 594                 tmp64 |= (userbuf[23] >> 40) & 0x0000000000ffffff;
 595                 /* OR sticky2 (bit 1496) to counter2 bit 32 */
 596                 tmp64 |= (userbuf[23] >> 8) & 0x0000000080000000;
 597                 raddr[2] = (uint32_t)tmp64;
 598
 599                 /* Counter3 is bits 1497 to 1528 */
 600                 tmp64 =  (userbuf[23] >> 7) & 0x00000000ffffffff;
 601                 /* OR sticky3 (bit 1529) to counter3 bit 32 */
 602                 tmp64 |= (userbuf[23] << 25) & 0x0000000080000000;
 603                 raddr[3] = (uint32_t)tmp64;
 604
 605                 /*
 606                  * Zero out the counters
 607                  */
 608
 609                 /*
 610                  * The counters and sticky-bits comprise the last 132 bits
 611                  * (1398 - 1529) of RDR16 on a U chip.  We'll zero these
 612                  * out the easy way: zero out last 10 bits of dword 21,
 613                  * all of dword 22 and 58 bits (plus 6 don't care bits) of
 614                  * dword 23.
 615                  */
 616                 userbuf[21] &= 0xfffffffffffffc00ul;    /* 0 to last 10 bits */
 617                 userbuf[22] = 0;
 618                 userbuf[23] = 0;
 619
 620                 /*
 621                  * Write back the zeroed bytes + the image given
 622                  * the read was destructive.
 623                  */
 624                 perf_rdr_write(16, userbuf);
 625         } else {
 626
 627                 /*
 628                  * Read RDR-15 which contains the counters and sticky bits
 629                  */
 630                 if (!perf_rdr_read_ubuf(15, userbuf)) {
 631                         return -13;
 632                 }
 633
 634                 /*
 635                  * Clear out the counters
 636                  */
 637                 perf_rdr_clear(15);
 638
 639                 /*
 640                  * Copy the counters
 641                  */
 642                 raddr[0] = (uint32_t)((userbuf[0] >> 32) & 0x00000000ffffffffUL);
 643                 raddr[1] = (uint32_t)(userbuf[0] & 0x00000000ffffffffUL);
 644                 raddr[2] = (uint32_t)((userbuf[1] >> 32) & 0x00000000ffffffffUL);
 645                 raddr[3] = (uint32_t)(userbuf[1] & 0x00000000ffffffffUL);
 646         }
 647
 648         return 0;
 649 }
 650
 651 /*
 652  * perf_rdr_get_entry
 653  *
 654  * Retrieve a pointer to the description of what this
 655  * RDR contains.
 656  */
 657 static const struct rdr_tbl_ent * perf_rdr_get_entry(uint32_t rdr_num)
 658 {
 659         if (perf_processor_interface == ONYX_INTF) {
 660                 return &perf_rdr_tbl_U[rdr_num];
 661         } else {
 662                 return &perf_rdr_tbl_W[rdr_num];
 663         }
 664 }
 665
 666 /*
 667  * perf_rdr_read_ubuf
 668  *
 669  * Read the RDR value into the buffer specified.
 670  */
 671 static int perf_rdr_read_ubuf(uint32_t  rdr_num, uint64_t *buffer)
 672 {
 673         uint64_t        data, data_mask = 0;
 674         uint32_t        width, xbits, i;
 675         const struct rdr_tbl_ent *tentry;
 676
 677         tentry = perf_rdr_get_entry(rdr_num);
 678         if ((width = tentry->width) == 0)
 679                 return 0;
 680
 681         /* Clear out buffer */
 682         i = tentry->num_words;
 683         while (i--) {
 684                 buffer[i] = 0;
 685         }
 686
 687         /* Check for bits an even number of 64 */
 688         if ((xbits = width & 0x03f) != 0) {
 689                 data_mask = 1;
 690                 data_mask <<= (64 - xbits);
 691                 data_mask--;
 692         }
 693
 694         /* Grab all of the data */
 695         i = tentry->num_words;
 696         while (i--) {
 697
 698                 if (perf_processor_interface == ONYX_INTF) {
 699                         data = perf_rdr_shift_in_U(rdr_num, width);
 700                 } else {
 701                         data = perf_rdr_shift_in_W(rdr_num, width);
 702                 }
 703                 if (xbits) {
 704                         buffer[i] |= (data << (64 - xbits));
 705                         if (i) {
 706                                 buffer[i-1] |= ((data >> xbits) & data_mask);
 707                         }
 708                 } else {
 709                         buffer[i] = data;
 710                 }
 711         }
 712
 713         return 1;
 714 }
 715
 716 /*
 717  * perf_rdr_clear
 718  *
 719  * Zero out the given RDR register
 720  */
 721 static int perf_rdr_clear(uint32_t      rdr_num)
 722 {
 723         const struct rdr_tbl_ent *tentry;
 724         int32_t         i;
 725
 726         tentry = perf_rdr_get_entry(rdr_num);
 727
 728         if (tentry->width == 0) {
 729                 return -1;
 730         }
 731
 732         i = tentry->num_words;
 733         while (i--) {
 734                 if (perf_processor_interface == ONYX_INTF) {
 735                         perf_rdr_shift_out_U(rdr_num, 0UL);
 736                 } else {
 737                         perf_rdr_shift_out_W(rdr_num, 0UL);
 738                 }
 739         }
 740
 741         return 0;
 742 }
 743
 744
 745 /*
 746  * perf_write_image
 747  *
 748  * Write the given image out to the processor
 749  */
 750 static int perf_write_image(uint64_t *memaddr)
 751 {
 752         uint64_t buffer[MAX_RDR_WORDS];
 753         uint64_t *bptr;
 754         uint32_t dwords;
 755         const uint32_t *intrigue_rdr;
 756         const uint64_t *intrigue_bitmask;
 757         uint64_t tmp64;
 758         void __iomem *runway;
 759         const struct rdr_tbl_ent *tentry;
 760         int i;
 761
 762         /* Clear out counters */
 763         if (perf_processor_interface == ONYX_INTF) {
 764
 765                 perf_rdr_clear(16);
 766
 767                 /* Toggle performance monitor */
 768                 perf_intrigue_enable_perf_counters();
 769                 perf_intrigue_disable_perf_counters();
 770
 771                 intrigue_rdr = perf_rdrs_U;
 772         } else {
 773                 perf_rdr_clear(15);
 774                 intrigue_rdr = perf_rdrs_W;
 775         }
 776
 777         /* Write all RDRs */
 778         while (*intrigue_rdr != -1) {
 779                 tentry = perf_rdr_get_entry(*intrigue_rdr);
 780                 perf_rdr_read_ubuf(*intrigue_rdr, buffer);
 781                 bptr   = &buffer[0];
 782                 dwords = tentry->num_words;
 783                 if (tentry->write_control) {
 784                         intrigue_bitmask = &bitmask_array[tentry->write_control >> 3];
 785                         while (dwords--) {
 786                                 tmp64 = *intrigue_bitmask & *memaddr++;
 787                                 tmp64 |= (~(*intrigue_bitmask++)) & *bptr;
 788                                 *bptr++ = tmp64;
 789                         }
 790                 } else {
 791                         while (dwords--) {
 792                                 *bptr++ = *memaddr++;
 793                         }
 794                 }
 795
 796                 perf_rdr_write(*intrigue_rdr, buffer);
 797                 intrigue_rdr++;
 798         }
 799
 800         /*
 801          * Now copy out the Runway stuff which is not in RDRs
 802          */
 803
 804         if (cpu_device == NULL)
 805         {
 806                 printk(KERN_ERR "write_image: cpu_device not yet initialized!\n");
 807                 return -1;
 808         }
 809
 810         runway = ioremap_nocache(cpu_device->hpa.start, 4096);
 811
 812         /* Merge intrigue bits into Runway STATUS 0 */
 813         tmp64 = __raw_readq(runway + RUNWAY_STATUS) & 0xffecfffffffffffful;
 814         __raw_writeq(tmp64 | (*memaddr++ & 0x0013000000000000ul),
 815                      runway + RUNWAY_STATUS);
 816
 817         /* Write RUNWAY DEBUG registers */
 818         for (i = 0; i < 8; i++) {
 819                 __raw_writeq(*memaddr++, runway + RUNWAY_DEBUG);
 820         }
 821
 822         return 0;
 823 }
 824
 825 /*
 826  * perf_rdr_write
 827  *
 828  * Write the given RDR register with the contents
 829  * of the given buffer.
 830  */
 831 static void perf_rdr_write(uint32_t rdr_num, uint64_t *buffer)
 832 {
 833         const struct rdr_tbl_ent *tentry;
 834         int32_t         i;
 835
 836 printk("perf_rdr_write\n");
 837         tentry = perf_rdr_get_entry(rdr_num);
 838         if (tentry->width == 0) { return; }
 839
 840         i = tentry->num_words;
 841         while (i--) {
 842                 if (perf_processor_interface == ONYX_INTF) {
 843                         perf_rdr_shift_out_U(rdr_num, buffer[i]);
 844                 } else {
 845                         perf_rdr_shift_out_W(rdr_num, buffer[i]);
 846                 }
 847         }
 848 printk("perf_rdr_write done\n");
 849 }
 850
 851 module_init(perf_init);