arch/powerpc/platforms/cell/pmu.c

   1 /*
   2  * Cell Broadband Engine Performance Monitor
   3  *
   4  * (C) Copyright IBM Corporation 2001,2006
   5  *
   6  * Author:
   7  *    David Erb (djerb@us.ibm.com)
   8  *    Kevin Corry (kevcorry@us.ibm.com)
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include <linux/interrupt.h>
  26 #include <linux/types.h>
  27 #include <asm/io.h>
  28 #include <asm/irq_regs.h>
  29 #include <asm/machdep.h>
  30 #include <asm/pmc.h>
  31 #include <asm/reg.h>
  32 #include <asm/spu.h>
  33
  34 #include "cbe_regs.h"
  35 #include "interrupt.h"
  36
  37 /*
  38  * When writing to write-only mmio addresses, save a shadow copy. All of the
  39  * registers are 32-bit, but stored in the upper-half of a 64-bit field in
  40  * pmd_regs.
  41  */
  42
  43 #define WRITE_WO_MMIO(reg, x)                                   \
  44         do {                                                    \
  45                 u32 _x = (x);                                   \
  46                 struct cbe_pmd_regs __iomem *pmd_regs;          \
  47                 struct cbe_pmd_shadow_regs *shadow_regs;        \
  48                 pmd_regs = cbe_get_cpu_pmd_regs(cpu);           \
  49                 shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu); \
  50                 out_be64(&(pmd_regs->reg), (((u64)_x) << 32));  \
  51                 shadow_regs->reg = _x;                          \
  52         } while (0)
  53
  54 #define READ_SHADOW_REG(val, reg)                               \
  55         do {                                                    \
  56                 struct cbe_pmd_shadow_regs *shadow_regs;        \
  57                 shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu); \
  58                 (val) = shadow_regs->reg;                       \
  59         } while (0)
  60
  61 #define READ_MMIO_UPPER32(val, reg)                             \
  62         do {                                                    \
  63                 struct cbe_pmd_regs __iomem *pmd_regs;          \
  64                 pmd_regs = cbe_get_cpu_pmd_regs(cpu);           \
  65                 (val) = (u32)(in_be64(&pmd_regs->reg) >> 32);   \
  66         } while (0)
  67
  68 /*
  69  * Physical counter registers.
  70  * Each physical counter can act as one 32-bit counter or two 16-bit counters.
  71  */
  72
  73 u32 cbe_read_phys_ctr(u32 cpu, u32 phys_ctr)
  74 {
  75         u32 val_in_latch, val = 0;
  76
  77         if (phys_ctr < NR_PHYS_CTRS) {
  78                 READ_SHADOW_REG(val_in_latch, counter_value_in_latch);
  79
  80                 /* Read the latch or the actual counter, whichever is newer. */
  81                 if (val_in_latch & (1 << phys_ctr)) {
  82                         READ_SHADOW_REG(val, pm_ctr[phys_ctr]);
  83                 } else {
  84                         READ_MMIO_UPPER32(val, pm_ctr[phys_ctr]);
  85                 }
  86         }
  87
  88         return val;
  89 }
  90 EXPORT_SYMBOL_GPL(cbe_read_phys_ctr);
  91
  92 void cbe_write_phys_ctr(u32 cpu, u32 phys_ctr, u32 val)
  93 {
  94         struct cbe_pmd_shadow_regs *shadow_regs;
  95         u32 pm_ctrl;
  96
  97         if (phys_ctr < NR_PHYS_CTRS) {
  98                 /* Writing to a counter only writes to a hardware latch.
  99                  * The new value is not propagated to the actual counter
 100                  * until the performance monitor is enabled.
 101                  */
 102                 WRITE_WO_MMIO(pm_ctr[phys_ctr], val);
 103
 104                 pm_ctrl = cbe_read_pm(cpu, pm_control);
 105                 if (pm_ctrl & CBE_PM_ENABLE_PERF_MON) {
 106                         /* The counters are already active, so we need to
 107                          * rewrite the pm_control register to "re-enable"
 108                          * the PMU.
 109                          */
 110                         cbe_write_pm(cpu, pm_control, pm_ctrl);
 111                 } else {
 112                         shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu);
 113                         shadow_regs->counter_value_in_latch |= (1 << phys_ctr);
 114                 }
 115         }
 116 }
 117 EXPORT_SYMBOL_GPL(cbe_write_phys_ctr);
 118
 119 /*
 120  * "Logical" counter registers.
 121  * These will read/write 16-bits or 32-bits depending on the
 122  * current size of the counter. Counters 4 - 7 are always 16-bit.
 123  */
 124
 125 u32 cbe_read_ctr(u32 cpu, u32 ctr)
 126 {
 127         u32 val;
 128         u32 phys_ctr = ctr & (NR_PHYS_CTRS - 1);
 129
 130         val = cbe_read_phys_ctr(cpu, phys_ctr);
 131
 132         if (cbe_get_ctr_size(cpu, phys_ctr) == 16)
 133                 val = (ctr < NR_PHYS_CTRS) ? (val >> 16) : (val & 0xffff);
 134
 135         return val;
 136 }
 137 EXPORT_SYMBOL_GPL(cbe_read_ctr);
 138
 139 void cbe_write_ctr(u32 cpu, u32 ctr, u32 val)
 140 {
 141         u32 phys_ctr;
 142         u32 phys_val;
 143
 144         phys_ctr = ctr & (NR_PHYS_CTRS - 1);
 145
 146         if (cbe_get_ctr_size(cpu, phys_ctr) == 16) {
 147                 phys_val = cbe_read_phys_ctr(cpu, phys_ctr);
 148
 149                 if (ctr < NR_PHYS_CTRS)
 150                         val = (val << 16) | (phys_val & 0xffff);
 151                 else
 152                         val = (val & 0xffff) | (phys_val & 0xffff0000);
 153         }
 154
 155         cbe_write_phys_ctr(cpu, phys_ctr, val);
 156 }
 157 EXPORT_SYMBOL_GPL(cbe_write_ctr);
 158
 159 /*
 160  * Counter-control registers.
 161  * Each "logical" counter has a corresponding control register.
 162  */
 163
 164 u32 cbe_read_pm07_control(u32 cpu, u32 ctr)
 165 {
 166         u32 pm07_control = 0;
 167
 168         if (ctr < NR_CTRS)
 169                 READ_SHADOW_REG(pm07_control, pm07_control[ctr]);
 170
 171         return pm07_control;
 172 }
 173 EXPORT_SYMBOL_GPL(cbe_read_pm07_control);
 174
 175 void cbe_write_pm07_control(u32 cpu, u32 ctr, u32 val)
 176 {
 177         if (ctr < NR_CTRS)
 178                 WRITE_WO_MMIO(pm07_control[ctr], val);
 179 }
 180 EXPORT_SYMBOL_GPL(cbe_write_pm07_control);
 181
 182 /*
 183  * Other PMU control registers. Most of these are write-only.
 184  */
 185
 186 u32 cbe_read_pm(u32 cpu, enum pm_reg_name reg)
 187 {
 188         u32 val = 0;
 189
 190         switch (reg) {
 191         case group_control:
 192                 READ_SHADOW_REG(val, group_control);
 193                 break;
 194
 195         case debug_bus_control:
 196                 READ_SHADOW_REG(val, debug_bus_control);
 197                 break;
 198
 199         case trace_address:
 200                 READ_MMIO_UPPER32(val, trace_address);
 201                 break;
 202
 203         case ext_tr_timer:
 204                 READ_SHADOW_REG(val, ext_tr_timer);
 205                 break;
 206
 207         case pm_status:
 208                 READ_MMIO_UPPER32(val, pm_status);
 209                 break;
 210
 211         case pm_control:
 212                 READ_SHADOW_REG(val, pm_control);
 213                 break;
 214
 215         case pm_interval:
 216                 READ_SHADOW_REG(val, pm_interval);
 217                 break;
 218
 219         case pm_start_stop:
 220                 READ_SHADOW_REG(val, pm_start_stop);
 221                 break;
 222         }
 223
 224         return val;
 225 }
 226 EXPORT_SYMBOL_GPL(cbe_read_pm);
 227
 228 void cbe_write_pm(u32 cpu, enum pm_reg_name reg, u32 val)
 229 {
 230         switch (reg) {
 231         case group_control:
 232                 WRITE_WO_MMIO(group_control, val);
 233                 break;
 234
 235         case debug_bus_control:
 236                 WRITE_WO_MMIO(debug_bus_control, val);
 237                 break;
 238
 239         case trace_address:
 240                 WRITE_WO_MMIO(trace_address, val);
 241                 break;
 242
 243         case ext_tr_timer:
 244                 WRITE_WO_MMIO(ext_tr_timer, val);
 245                 break;
 246
 247         case pm_status:
 248                 WRITE_WO_MMIO(pm_status, val);
 249                 break;
 250
 251         case pm_control:
 252                 WRITE_WO_MMIO(pm_control, val);
 253                 break;
 254
 255         case pm_interval:
 256                 WRITE_WO_MMIO(pm_interval, val);
 257                 break;
 258
 259         case pm_start_stop:
 260                 WRITE_WO_MMIO(pm_start_stop, val);
 261                 break;
 262         }
 263 }
 264 EXPORT_SYMBOL_GPL(cbe_write_pm);
 265
 266 /*
 267  * Get/set the size of a physical counter to either 16 or 32 bits.
 268  */
 269
 270 u32 cbe_get_ctr_size(u32 cpu, u32 phys_ctr)
 271 {
 272         u32 pm_ctrl, size = 0;
 273
 274         if (phys_ctr < NR_PHYS_CTRS) {
 275                 pm_ctrl = cbe_read_pm(cpu, pm_control);
 276                 size = (pm_ctrl & CBE_PM_16BIT_CTR(phys_ctr)) ? 16 : 32;
 277         }
 278
 279         return size;
 280 }
 281 EXPORT_SYMBOL_GPL(cbe_get_ctr_size);
 282
 283 void cbe_set_ctr_size(u32 cpu, u32 phys_ctr, u32 ctr_size)
 284 {
 285         u32 pm_ctrl;
 286
 287         if (phys_ctr < NR_PHYS_CTRS) {
 288                 pm_ctrl = cbe_read_pm(cpu, pm_control);
 289                 switch (ctr_size) {
 290                 case 16:
 291                         pm_ctrl |= CBE_PM_16BIT_CTR(phys_ctr);
 292                         break;
 293
 294                 case 32:
 295                         pm_ctrl &= ~CBE_PM_16BIT_CTR(phys_ctr);
 296                         break;
 297                 }
 298                 cbe_write_pm(cpu, pm_control, pm_ctrl);
 299         }
 300 }
 301 EXPORT_SYMBOL_GPL(cbe_set_ctr_size);
 302
 303 /*
 304  * Enable/disable the entire performance monitoring unit.
 305  * When we enable the PMU, all pending writes to counters get committed.
 306  */
 307
 308 void cbe_enable_pm(u32 cpu)
 309 {
 310         struct cbe_pmd_shadow_regs *shadow_regs;
 311         u32 pm_ctrl;
 312
 313         shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu);
 314         shadow_regs->counter_value_in_latch = 0;
 315
 316         pm_ctrl = cbe_read_pm(cpu, pm_control) | CBE_PM_ENABLE_PERF_MON;
 317         cbe_write_pm(cpu, pm_control, pm_ctrl);
 318 }
 319 EXPORT_SYMBOL_GPL(cbe_enable_pm);
 320
 321 void cbe_disable_pm(u32 cpu)
 322 {
 323         u32 pm_ctrl;
 324         pm_ctrl = cbe_read_pm(cpu, pm_control) & ~CBE_PM_ENABLE_PERF_MON;
 325         cbe_write_pm(cpu, pm_control, pm_ctrl);
 326 }
 327 EXPORT_SYMBOL_GPL(cbe_disable_pm);
 328
 329 /*
 330  * Reading from the trace_buffer.
 331  * The trace buffer is two 64-bit registers. Reading from
 332  * the second half automatically increments the trace_address.
 333  */
 334
 335 void cbe_read_trace_buffer(u32 cpu, u64 *buf)
 336 {
 337         struct cbe_pmd_regs __iomem *pmd_regs = cbe_get_cpu_pmd_regs(cpu);
 338
 339         *buf++ = in_be64(&pmd_regs->trace_buffer_0_63);
 340         *buf++ = in_be64(&pmd_regs->trace_buffer_64_127);
 341 }
 342 EXPORT_SYMBOL_GPL(cbe_read_trace_buffer);
 343
 344 /*
 345  * Enabling/disabling interrupts for the entire performance monitoring unit.
 346  */
 347
 348 u32 cbe_get_and_clear_pm_interrupts(u32 cpu)
 349 {
 350         /* Reading pm_status clears the interrupt bits. */
 351         return cbe_read_pm(cpu, pm_status);
 352 }
 353 EXPORT_SYMBOL_GPL(cbe_get_and_clear_pm_interrupts);
 354
 355 void cbe_enable_pm_interrupts(u32 cpu, u32 thread, u32 mask)
 356 {
 357         /* Set which node and thread will handle the next interrupt. */
 358         iic_set_interrupt_routing(cpu, thread, 0);
 359
 360         /* Enable the interrupt bits in the pm_status register. */
 361         if (mask)
 362                 cbe_write_pm(cpu, pm_status, mask);
 363 }
 364 EXPORT_SYMBOL_GPL(cbe_enable_pm_interrupts);
 365
 366 void cbe_disable_pm_interrupts(u32 cpu)
 367 {
 368         cbe_get_and_clear_pm_interrupts(cpu);
 369         cbe_write_pm(cpu, pm_status, 0);
 370 }
 371 EXPORT_SYMBOL_GPL(cbe_disable_pm_interrupts);
 372
 373 static irqreturn_t cbe_pm_irq(int irq, void *dev_id)
 374 {
 375         perf_irq(get_irq_regs());
 376         return IRQ_HANDLED;
 377 }
 378
 379 static int __init cbe_init_pm_irq(void)
 380 {
 381         unsigned int irq;
 382         int rc, node;
 383
 384         if (!machine_is(cell))
 385                 return 0;
 386
 387         for_each_node(node) {
 388                 irq = irq_create_mapping(NULL, IIC_IRQ_IOEX_PMI |
 389                                                (node << IIC_IRQ_NODE_SHIFT));
 390                 if (irq == NO_IRQ) {
 391                         printk("ERROR: Unable to allocate irq for node %d\n",
 392                                node);
 393                         return -EINVAL;
 394                 }
 395
 396                 rc = request_irq(irq, cbe_pm_irq,
 397                                  IRQF_DISABLED, "cbe-pmu-0", NULL);
 398                 if (rc) {
 399                         printk("ERROR: Request for irq on node %d failed\n",
 400                                node);
 401                         return rc;
 402                 }
 403         }
 404
 405         return 0;
 406 }
 407 arch_initcall(cbe_init_pm_irq);
 408
 409 void cbe_sync_irq(int node)
 410 {
 411         unsigned int irq;
 412
 413         irq = irq_find_mapping(NULL,
 414                                IIC_IRQ_IOEX_PMI
 415                                | (node << IIC_IRQ_NODE_SHIFT));
 416
 417         if (irq == NO_IRQ) {
 418                 printk(KERN_WARNING "ERROR, unable to get existing irq %d " \
 419                 "for node %d\n", irq, node);
 420                 return;
 421         }
 422
 423         synchronize_irq(irq);
 424 }
 425 EXPORT_SYMBOL_GPL(cbe_sync_irq);
 426