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