arch/powerpc/platforms/cell/spu_manage.c

   1 /*
   2  * spu management operations for of based platforms
   3  *
   4  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   5  * Copyright 2006 Sony Corp.
   6  * (C) Copyright 2007 TOSHIBA CORPORATION
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  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 along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include <linux/interrupt.h>
  23 #include <linux/list.h>
  24 #include <linux/module.h>
  25 #include <linux/ptrace.h>
  26 #include <linux/slab.h>
  27 #include <linux/wait.h>
  28 #include <linux/mm.h>
  29 #include <linux/io.h>
  30 #include <linux/mutex.h>
  31 #include <linux/device.h>
  32
  33 #include <asm/spu.h>
  34 #include <asm/spu_priv1.h>
  35 #include <asm/firmware.h>
  36 #include <asm/prom.h>
  37
  38 #include "spufs/spufs.h"
  39 #include "interrupt.h"
  40
  41 struct device_node *spu_devnode(struct spu *spu)
  42 {
  43         return spu->devnode;
  44 }
  45
  46 EXPORT_SYMBOL_GPL(spu_devnode);
  47
  48 static u64 __init find_spu_unit_number(struct device_node *spe)
  49 {
  50         const unsigned int *prop;
  51         int proplen;
  52
  53         /* new device trees should provide the physical-id attribute */
  54         prop = of_get_property(spe, "physical-id", &proplen);
  55         if (proplen == 4)
  56                 return (u64)*prop;
  57
  58         /* celleb device tree provides the unit-id */
  59         prop = of_get_property(spe, "unit-id", &proplen);
  60         if (proplen == 4)
  61                 return (u64)*prop;
  62
  63         /* legacy device trees provide the id in the reg attribute */
  64         prop = of_get_property(spe, "reg", &proplen);
  65         if (proplen == 4)
  66                 return (u64)*prop;
  67
  68         return 0;
  69 }
  70
  71 static void spu_unmap(struct spu *spu)
  72 {
  73         if (!firmware_has_feature(FW_FEATURE_LPAR))
  74                 iounmap(spu->priv1);
  75         iounmap(spu->priv2);
  76         iounmap(spu->problem);
  77         iounmap((__force u8 __iomem *)spu->local_store);
  78 }
  79
  80 static int __init spu_map_interrupts_old(struct spu *spu,
  81         struct device_node *np)
  82 {
  83         unsigned int isrc;
  84         const u32 *tmp;
  85         int nid;
  86
  87         /* Get the interrupt source unit from the device-tree */
  88         tmp = of_get_property(np, "isrc", NULL);
  89         if (!tmp)
  90                 return -ENODEV;
  91         isrc = tmp[0];
  92
  93         tmp = of_get_property(np->parent->parent, "node-id", NULL);
  94         if (!tmp) {
  95                 printk(KERN_WARNING "%s: can't find node-id\n", __func__);
  96                 nid = spu->node;
  97         } else
  98                 nid = tmp[0];
  99
 100         /* Add the node number */
 101         isrc |= nid << IIC_IRQ_NODE_SHIFT;
 102
 103         /* Now map interrupts of all 3 classes */
 104         spu->irqs[0] = irq_create_mapping(NULL, IIC_IRQ_CLASS_0 | isrc);
 105         spu->irqs[1] = irq_create_mapping(NULL, IIC_IRQ_CLASS_1 | isrc);
 106         spu->irqs[2] = irq_create_mapping(NULL, IIC_IRQ_CLASS_2 | isrc);
 107
 108         /* Right now, we only fail if class 2 failed */
 109         return spu->irqs[2] == NO_IRQ ? -EINVAL : 0;
 110 }
 111
 112 static void __iomem * __init spu_map_prop_old(struct spu *spu,
 113                                               struct device_node *n,
 114                                               const char *name)
 115 {
 116         const struct address_prop {
 117                 unsigned long address;
 118                 unsigned int len;
 119         } __attribute__((packed)) *prop;
 120         int proplen;
 121
 122         prop = of_get_property(n, name, &proplen);
 123         if (prop == NULL || proplen != sizeof (struct address_prop))
 124                 return NULL;
 125
 126         return ioremap(prop->address, prop->len);
 127 }
 128
 129 static int __init spu_map_device_old(struct spu *spu)
 130 {
 131         struct device_node *node = spu->devnode;
 132         const char *prop;
 133         int ret;
 134
 135         ret = -ENODEV;
 136         spu->name = of_get_property(node, "name", NULL);
 137         if (!spu->name)
 138                 goto out;
 139
 140         prop = of_get_property(node, "local-store", NULL);
 141         if (!prop)
 142                 goto out;
 143         spu->local_store_phys = *(unsigned long *)prop;
 144
 145         /* we use local store as ram, not io memory */
 146         spu->local_store = (void __force *)
 147                 spu_map_prop_old(spu, node, "local-store");
 148         if (!spu->local_store)
 149                 goto out;
 150
 151         prop = of_get_property(node, "problem", NULL);
 152         if (!prop)
 153                 goto out_unmap;
 154         spu->problem_phys = *(unsigned long *)prop;
 155
 156         spu->problem = spu_map_prop_old(spu, node, "problem");
 157         if (!spu->problem)
 158                 goto out_unmap;
 159
 160         spu->priv2 = spu_map_prop_old(spu, node, "priv2");
 161         if (!spu->priv2)
 162                 goto out_unmap;
 163
 164         if (!firmware_has_feature(FW_FEATURE_LPAR)) {
 165                 spu->priv1 = spu_map_prop_old(spu, node, "priv1");
 166                 if (!spu->priv1)
 167                         goto out_unmap;
 168         }
 169
 170         ret = 0;
 171         goto out;
 172
 173 out_unmap:
 174         spu_unmap(spu);
 175 out:
 176         return ret;
 177 }
 178
 179 static int __init spu_map_interrupts(struct spu *spu, struct device_node *np)
 180 {
 181         struct of_irq oirq;
 182         int ret;
 183         int i;
 184
 185         for (i=0; i < 3; i++) {
 186                 ret = of_irq_map_one(np, i, &oirq);
 187                 if (ret) {
 188                         pr_debug("spu_new: failed to get irq %d\n", i);
 189                         goto err;
 190                 }
 191                 ret = -EINVAL;
 192                 pr_debug("  irq %d no 0x%x on %s\n", i, oirq.specifier[0],
 193                          oirq.controller->full_name);
 194                 spu->irqs[i] = irq_create_of_mapping(oirq.controller,
 195                                         oirq.specifier, oirq.size);
 196                 if (spu->irqs[i] == NO_IRQ) {
 197                         pr_debug("spu_new: failed to map it !\n");
 198                         goto err;
 199                 }
 200         }
 201         return 0;
 202
 203 err:
 204         pr_debug("failed to map irq %x for spu %s\n", *oirq.specifier,
 205                 spu->name);
 206         for (; i >= 0; i--) {
 207                 if (spu->irqs[i] != NO_IRQ)
 208                         irq_dispose_mapping(spu->irqs[i]);
 209         }
 210         return ret;
 211 }
 212
 213 static int spu_map_resource(struct spu *spu, int nr,
 214                             void __iomem** virt, unsigned long *phys)
 215 {
 216         struct device_node *np = spu->devnode;
 217         struct resource resource = { };
 218         unsigned long len;
 219         int ret;
 220
 221         ret = of_address_to_resource(np, nr, &resource);
 222         if (ret)
 223                 return ret;
 224         if (phys)
 225                 *phys = resource.start;
 226         len = resource.end - resource.start + 1;
 227         *virt = ioremap(resource.start, len);
 228         if (!*virt)
 229                 return -EINVAL;
 230         return 0;
 231 }
 232
 233 static int __init spu_map_device(struct spu *spu)
 234 {
 235         struct device_node *np = spu->devnode;
 236         int ret = -ENODEV;
 237
 238         spu->name = of_get_property(np, "name", NULL);
 239         if (!spu->name)
 240                 goto out;
 241
 242         ret = spu_map_resource(spu, 0, (void __iomem**)&spu->local_store,
 243                                &spu->local_store_phys);
 244         if (ret) {
 245                 pr_debug("spu_new: failed to map %s resource 0\n",
 246                          np->full_name);
 247                 goto out;
 248         }
 249         ret = spu_map_resource(spu, 1, (void __iomem**)&spu->problem,
 250                                &spu->problem_phys);
 251         if (ret) {
 252                 pr_debug("spu_new: failed to map %s resource 1\n",
 253                          np->full_name);
 254                 goto out_unmap;
 255         }
 256         ret = spu_map_resource(spu, 2, (void __iomem**)&spu->priv2, NULL);
 257         if (ret) {
 258                 pr_debug("spu_new: failed to map %s resource 2\n",
 259                          np->full_name);
 260                 goto out_unmap;
 261         }
 262         if (!firmware_has_feature(FW_FEATURE_LPAR))
 263                 ret = spu_map_resource(spu, 3,
 264                                (void __iomem**)&spu->priv1, NULL);
 265         if (ret) {
 266                 pr_debug("spu_new: failed to map %s resource 3\n",
 267                          np->full_name);
 268                 goto out_unmap;
 269         }
 270         pr_debug("spu_new: %s maps:\n", np->full_name);
 271         pr_debug("  local store   : 0x%016lx -> 0x%p\n",
 272                  spu->local_store_phys, spu->local_store);
 273         pr_debug("  problem state : 0x%016lx -> 0x%p\n",
 274                  spu->problem_phys, spu->problem);
 275         pr_debug("  priv2         :                       0x%p\n", spu->priv2);
 276         pr_debug("  priv1         :                       0x%p\n", spu->priv1);
 277
 278         return 0;
 279
 280 out_unmap:
 281         spu_unmap(spu);
 282 out:
 283         pr_debug("failed to map spe %s: %d\n", spu->name, ret);
 284         return ret;
 285 }
 286
 287 static int __init of_enumerate_spus(int (*fn)(void *data))
 288 {
 289         int ret;
 290         struct device_node *node;
 291         unsigned int n = 0;
 292
 293         ret = -ENODEV;
 294         for (node = of_find_node_by_type(NULL, "spe");
 295                         node; node = of_find_node_by_type(node, "spe")) {
 296                 ret = fn(node);
 297                 if (ret) {
 298                         printk(KERN_WARNING "%s: Error initializing %s\n",
 299                                 __func__, node->name);
 300                         break;
 301                 }
 302                 n++;
 303         }
 304         return ret ? ret : n;
 305 }
 306
 307 static int __init of_create_spu(struct spu *spu, void *data)
 308 {
 309         int ret;
 310         struct device_node *spe = (struct device_node *)data;
 311         static int legacy_map = 0, legacy_irq = 0;
 312
 313         spu->devnode = of_node_get(spe);
 314         spu->spe_id = find_spu_unit_number(spe);
 315
 316         spu->node = of_node_to_nid(spe);
 317         if (spu->node >= MAX_NUMNODES) {
 318                 printk(KERN_WARNING "SPE %s on node %d ignored,"
 319                        " node number too big\n", spe->full_name, spu->node);
 320                 printk(KERN_WARNING "Check if CONFIG_NUMA is enabled.\n");
 321                 ret = -ENODEV;
 322                 goto out;
 323         }
 324
 325         ret = spu_map_device(spu);
 326         if (ret) {
 327                 if (!legacy_map) {
 328                         legacy_map = 1;
 329                         printk(KERN_WARNING "%s: Legacy device tree found, "
 330                                 "trying to map old style\n", __func__);
 331                 }
 332                 ret = spu_map_device_old(spu);
 333                 if (ret) {
 334                         printk(KERN_ERR "Unable to map %s\n",
 335                                 spu->name);
 336                         goto out;
 337                 }
 338         }
 339
 340         ret = spu_map_interrupts(spu, spe);
 341         if (ret) {
 342                 if (!legacy_irq) {
 343                         legacy_irq = 1;
 344                         printk(KERN_WARNING "%s: Legacy device tree found, "
 345                                 "trying old style irq\n", __func__);
 346                 }
 347                 ret = spu_map_interrupts_old(spu, spe);
 348                 if (ret) {
 349                         printk(KERN_ERR "%s: could not map interrupts\n",
 350                                 spu->name);
 351                         goto out_unmap;
 352                 }
 353         }
 354
 355         pr_debug("Using SPE %s %p %p %p %p %d\n", spu->name,
 356                 spu->local_store, spu->problem, spu->priv1,
 357                 spu->priv2, spu->number);
 358         goto out;
 359
 360 out_unmap:
 361         spu_unmap(spu);
 362 out:
 363         return ret;
 364 }
 365
 366 static int of_destroy_spu(struct spu *spu)
 367 {
 368         spu_unmap(spu);
 369         of_node_put(spu->devnode);
 370         return 0;
 371 }
 372
 373 static void enable_spu_by_master_run(struct spu_context *ctx)
 374 {
 375         ctx->ops->master_start(ctx);
 376 }
 377
 378 static void disable_spu_by_master_run(struct spu_context *ctx)
 379 {
 380         ctx->ops->master_stop(ctx);
 381 }
 382
 383 /* Hardcoded affinity idxs for qs20 */
 384 #define QS20_SPES_PER_BE 8
 385 static int qs20_reg_idxs[QS20_SPES_PER_BE] =   { 0, 2, 4, 6, 7, 5, 3, 1 };
 386 static int qs20_reg_memory[QS20_SPES_PER_BE] = { 1, 1, 0, 0, 0, 0, 0, 0 };
 387
 388 static struct spu *spu_lookup_reg(int node, u32 reg)
 389 {
 390         struct spu *spu;
 391         const u32 *spu_reg;
 392
 393         list_for_each_entry(spu, &cbe_spu_info[node].spus, cbe_list) {
 394                 spu_reg = of_get_property(spu_devnode(spu), "reg", NULL);
 395                 if (*spu_reg == reg)
 396                         return spu;
 397         }
 398         return NULL;
 399 }
 400
 401 static void init_affinity_qs20_harcoded(void)
 402 {
 403         int node, i;
 404         struct spu *last_spu, *spu;
 405         u32 reg;
 406
 407         for (node = 0; node < MAX_NUMNODES; node++) {
 408                 last_spu = NULL;
 409                 for (i = 0; i < QS20_SPES_PER_BE; i++) {
 410                         reg = qs20_reg_idxs[i];
 411                         spu = spu_lookup_reg(node, reg);
 412                         if (!spu)
 413                                 continue;
 414                         spu->has_mem_affinity = qs20_reg_memory[reg];
 415                         if (last_spu)
 416                                 list_add_tail(&spu->aff_list,
 417                                                 &last_spu->aff_list);
 418                         last_spu = spu;
 419                 }
 420         }
 421 }
 422
 423 static int of_has_vicinity(void)
 424 {
 425         struct device_node *dn;
 426
 427         for_each_node_by_type(dn, "spe") {
 428                 if (of_find_property(dn, "vicinity", NULL))  {
 429                         of_node_put(dn);
 430                         return 1;
 431                 }
 432         }
 433         return 0;
 434 }
 435
 436 static struct spu *devnode_spu(int cbe, struct device_node *dn)
 437 {
 438         struct spu *spu;
 439
 440         list_for_each_entry(spu, &cbe_spu_info[cbe].spus, cbe_list)
 441                 if (spu_devnode(spu) == dn)
 442                         return spu;
 443         return NULL;
 444 }
 445
 446 static struct spu *
 447 neighbour_spu(int cbe, struct device_node *target, struct device_node *avoid)
 448 {
 449         struct spu *spu;
 450         struct device_node *spu_dn;
 451         const phandle *vic_handles;
 452         int lenp, i;
 453
 454         list_for_each_entry(spu, &cbe_spu_info[cbe].spus, cbe_list) {
 455                 spu_dn = spu_devnode(spu);
 456                 if (spu_dn == avoid)
 457                         continue;
 458                 vic_handles = of_get_property(spu_dn, "vicinity", &lenp);
 459                 for (i=0; i < (lenp / sizeof(phandle)); i++) {
 460                         if (vic_handles[i] == target->linux_phandle)
 461                                 return spu;
 462                 }
 463         }
 464         return NULL;
 465 }
 466
 467 static void init_affinity_node(int cbe)
 468 {
 469         struct spu *spu, *last_spu;
 470         struct device_node *vic_dn, *last_spu_dn;
 471         phandle avoid_ph;
 472         const phandle *vic_handles;
 473         const char *name;
 474         int lenp, i, added;
 475
 476         last_spu = list_first_entry(&cbe_spu_info[cbe].spus, struct spu,
 477                                                                 cbe_list);
 478         avoid_ph = 0;
 479         for (added = 1; added < cbe_spu_info[cbe].n_spus; added++) {
 480                 last_spu_dn = spu_devnode(last_spu);
 481                 vic_handles = of_get_property(last_spu_dn, "vicinity", &lenp);
 482
 483                 /*
 484                  * Walk through each phandle in vicinity property of the spu
 485                  * (tipically two vicinity phandles per spe node)
 486                  */
 487                 for (i = 0; i < (lenp / sizeof(phandle)); i++) {
 488                         if (vic_handles[i] == avoid_ph)
 489                                 continue;
 490
 491                         vic_dn = of_find_node_by_phandle(vic_handles[i]);
 492                         if (!vic_dn)
 493                                 continue;
 494
 495                         /* a neighbour might be spe, mic-tm, or bif0 */
 496                         name = of_get_property(vic_dn, "name", NULL);
 497                         if (!name)
 498                                 continue;
 499
 500                         if (strcmp(name, "spe") == 0) {
 501                                 spu = devnode_spu(cbe, vic_dn);
 502                                 avoid_ph = last_spu_dn->linux_phandle;
 503                         } else {
 504                                 /*
 505                                  * "mic-tm" and "bif0" nodes do not have
 506                                  * vicinity property. So we need to find the
 507                                  * spe which has vic_dn as neighbour, but
 508                                  * skipping the one we came from (last_spu_dn)
 509                                  */
 510                                 spu = neighbour_spu(cbe, vic_dn, last_spu_dn);
 511                                 if (!spu)
 512                                         continue;
 513                                 if (!strcmp(name, "mic-tm")) {
 514                                         last_spu->has_mem_affinity = 1;
 515                                         spu->has_mem_affinity = 1;
 516                                 }
 517                                 avoid_ph = vic_dn->linux_phandle;
 518                         }
 519
 520                         list_add_tail(&spu->aff_list, &last_spu->aff_list);
 521                         last_spu = spu;
 522                         break;
 523                 }
 524         }
 525 }
 526
 527 static void init_affinity_fw(void)
 528 {
 529         int cbe;
 530
 531         for (cbe = 0; cbe < MAX_NUMNODES; cbe++)
 532                 init_affinity_node(cbe);
 533 }
 534
 535 static int __init init_affinity(void)
 536 {
 537         if (of_has_vicinity()) {
 538                 init_affinity_fw();
 539         } else {
 540                 long root = of_get_flat_dt_root();
 541                 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0"))
 542                         init_affinity_qs20_harcoded();
 543                 else
 544                         printk("No affinity configuration found\n");
 545         }
 546
 547         return 0;
 548 }
 549
 550 const struct spu_management_ops spu_management_of_ops = {
 551         .enumerate_spus = of_enumerate_spus,
 552         .create_spu = of_create_spu,
 553         .destroy_spu = of_destroy_spu,
 554         .enable_spu = enable_spu_by_master_run,
 555         .disable_spu = disable_spu_by_master_run,
 556         .init_affinity = init_affinity,
 557 };