drivers/misc/cxl/native.c

   1 /*
   2  * Copyright 2014 IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/spinlock.h>
  11 #include <linux/sched.h>
  12 #include <linux/slab.h>
  13 #include <linux/sched.h>
  14 #include <linux/mutex.h>
  15 #include <linux/mm.h>
  16 #include <linux/uaccess.h>
  17 #include <asm/synch.h>
  18 #include <misc/cxl-base.h>
  19
  20 #include "cxl.h"
  21 #include "trace.h"
  22
  23 static int afu_control(struct cxl_afu *afu, u64 command,
  24                        u64 result, u64 mask, bool enabled)
  25 {
  26         u64 AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An);
  27         unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
  28         int rc = 0;
  29
  30         spin_lock(&afu->afu_cntl_lock);
  31         pr_devel("AFU command starting: %llx\n", command);
  32
  33         trace_cxl_afu_ctrl(afu, command);
  34
  35         cxl_p2n_write(afu, CXL_AFU_Cntl_An, AFU_Cntl | command);
  36
  37         AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An);
  38         while ((AFU_Cntl & mask) != result) {
  39                 if (time_after_eq(jiffies, timeout)) {
  40                         dev_warn(&afu->dev, "WARNING: AFU control timed out!\n");
  41                         rc = -EBUSY;
  42                         goto out;
  43                 }
  44
  45                 if (!cxl_adapter_link_ok(afu->adapter)) {
  46                         afu->enabled = enabled;
  47                         rc = -EIO;
  48                         goto out;
  49                 }
  50
  51                 pr_devel_ratelimited("AFU control... (0x%016llx)\n",
  52                                      AFU_Cntl | command);
  53                 cpu_relax();
  54                 AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An);
  55         };
  56         pr_devel("AFU command complete: %llx\n", command);
  57         afu->enabled = enabled;
  58 out:
  59         trace_cxl_afu_ctrl_done(afu, command, rc);
  60         spin_unlock(&afu->afu_cntl_lock);
  61
  62         return rc;
  63 }
  64
  65 static int afu_enable(struct cxl_afu *afu)
  66 {
  67         pr_devel("AFU enable request\n");
  68
  69         return afu_control(afu, CXL_AFU_Cntl_An_E,
  70                            CXL_AFU_Cntl_An_ES_Enabled,
  71                            CXL_AFU_Cntl_An_ES_MASK, true);
  72 }
  73
  74 int cxl_afu_disable(struct cxl_afu *afu)
  75 {
  76         pr_devel("AFU disable request\n");
  77
  78         return afu_control(afu, 0, CXL_AFU_Cntl_An_ES_Disabled,
  79                            CXL_AFU_Cntl_An_ES_MASK, false);
  80 }
  81
  82 /* This will disable as well as reset */
  83 int __cxl_afu_reset(struct cxl_afu *afu)
  84 {
  85         pr_devel("AFU reset request\n");
  86
  87         return afu_control(afu, CXL_AFU_Cntl_An_RA,
  88                            CXL_AFU_Cntl_An_RS_Complete | CXL_AFU_Cntl_An_ES_Disabled,
  89                            CXL_AFU_Cntl_An_RS_MASK | CXL_AFU_Cntl_An_ES_MASK,
  90                            false);
  91 }
  92
  93 int cxl_afu_check_and_enable(struct cxl_afu *afu)
  94 {
  95         if (!cxl_adapter_link_ok(afu->adapter)) {
  96                 WARN(1, "Refusing to enable afu while link down!\n");
  97                 return -EIO;
  98         }
  99         if (afu->enabled)
 100                 return 0;
 101         return afu_enable(afu);
 102 }
 103
 104 int cxl_psl_purge(struct cxl_afu *afu)
 105 {
 106         u64 PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An);
 107         u64 AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An);
 108         u64 dsisr, dar;
 109         u64 start, end;
 110         unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
 111         int rc = 0;
 112
 113         trace_cxl_psl_ctrl(afu, CXL_PSL_SCNTL_An_Pc);
 114
 115         pr_devel("PSL purge request\n");
 116
 117         if (!cxl_adapter_link_ok(afu->adapter)) {
 118                 dev_warn(&afu->dev, "PSL Purge called with link down, ignoring\n");
 119                 rc = -EIO;
 120                 goto out;
 121         }
 122
 123         if ((AFU_Cntl & CXL_AFU_Cntl_An_ES_MASK) != CXL_AFU_Cntl_An_ES_Disabled) {
 124                 WARN(1, "psl_purge request while AFU not disabled!\n");
 125                 cxl_afu_disable(afu);
 126         }
 127
 128         cxl_p1n_write(afu, CXL_PSL_SCNTL_An,
 129                        PSL_CNTL | CXL_PSL_SCNTL_An_Pc);
 130         start = local_clock();
 131         PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An);
 132         while ((PSL_CNTL &  CXL_PSL_SCNTL_An_Ps_MASK)
 133                         == CXL_PSL_SCNTL_An_Ps_Pending) {
 134                 if (time_after_eq(jiffies, timeout)) {
 135                         dev_warn(&afu->dev, "WARNING: PSL Purge timed out!\n");
 136                         rc = -EBUSY;
 137                         goto out;
 138                 }
 139                 if (!cxl_adapter_link_ok(afu->adapter)) {
 140                         rc = -EIO;
 141                         goto out;
 142                 }
 143
 144                 dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
 145                 pr_devel_ratelimited("PSL purging... PSL_CNTL: 0x%016llx  PSL_DSISR: 0x%016llx\n", PSL_CNTL, dsisr);
 146                 if (dsisr & CXL_PSL_DSISR_TRANS) {
 147                         dar = cxl_p2n_read(afu, CXL_PSL_DAR_An);
 148                         dev_notice(&afu->dev, "PSL purge terminating pending translation, DSISR: 0x%016llx, DAR: 0x%016llx\n", dsisr, dar);
 149                         cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE);
 150                 } else if (dsisr) {
 151                         dev_notice(&afu->dev, "PSL purge acknowledging pending non-translation fault, DSISR: 0x%016llx\n", dsisr);
 152                         cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A);
 153                 } else {
 154                         cpu_relax();
 155                 }
 156                 PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An);
 157         };
 158         end = local_clock();
 159         pr_devel("PSL purged in %lld ns\n", end - start);
 160
 161         cxl_p1n_write(afu, CXL_PSL_SCNTL_An,
 162                        PSL_CNTL & ~CXL_PSL_SCNTL_An_Pc);
 163 out:
 164         trace_cxl_psl_ctrl_done(afu, CXL_PSL_SCNTL_An_Pc, rc);
 165         return rc;
 166 }
 167
 168 static int spa_max_procs(int spa_size)
 169 {
 170         /*
 171          * From the CAIA:
 172          *    end_of_SPA_area = SPA_Base + ((n+4) * 128) + (( ((n*8) + 127) >> 7) * 128) + 255
 173          * Most of that junk is really just an overly-complicated way of saying
 174          * the last 256 bytes are __aligned(128), so it's really:
 175          *    end_of_SPA_area = end_of_PSL_queue_area + __aligned(128) 255
 176          * and
 177          *    end_of_PSL_queue_area = SPA_Base + ((n+4) * 128) + (n*8) - 1
 178          * so
 179          *    sizeof(SPA) = ((n+4) * 128) + (n*8) + __aligned(128) 256
 180          * Ignore the alignment (which is safe in this case as long as we are
 181          * careful with our rounding) and solve for n:
 182          */
 183         return ((spa_size / 8) - 96) / 17;
 184 }
 185
 186 int cxl_alloc_spa(struct cxl_afu *afu)
 187 {
 188         /* Work out how many pages to allocate */
 189         afu->spa_order = 0;
 190         do {
 191                 afu->spa_order++;
 192                 afu->spa_size = (1 << afu->spa_order) * PAGE_SIZE;
 193                 afu->spa_max_procs = spa_max_procs(afu->spa_size);
 194         } while (afu->spa_max_procs < afu->num_procs);
 195
 196         WARN_ON(afu->spa_size > 0x100000); /* Max size supported by the hardware */
 197
 198         if (!(afu->spa = (struct cxl_process_element *)
 199               __get_free_pages(GFP_KERNEL | __GFP_ZERO, afu->spa_order))) {
 200                 pr_err("cxl_alloc_spa: Unable to allocate scheduled process area\n");
 201                 return -ENOMEM;
 202         }
 203         pr_devel("spa pages: %i afu->spa_max_procs: %i   afu->num_procs: %i\n",
 204                  1<<afu->spa_order, afu->spa_max_procs, afu->num_procs);
 205
 206         return 0;
 207 }
 208
 209 static void attach_spa(struct cxl_afu *afu)
 210 {
 211         u64 spap;
 212
 213         afu->sw_command_status = (__be64 *)((char *)afu->spa +
 214                                             ((afu->spa_max_procs + 3) * 128));
 215
 216         spap = virt_to_phys(afu->spa) & CXL_PSL_SPAP_Addr;
 217         spap |= ((afu->spa_size >> (12 - CXL_PSL_SPAP_Size_Shift)) - 1) & CXL_PSL_SPAP_Size;
 218         spap |= CXL_PSL_SPAP_V;
 219         pr_devel("cxl: SPA allocated at 0x%p. Max processes: %i, sw_command_status: 0x%p CXL_PSL_SPAP_An=0x%016llx\n", afu->spa, afu->spa_max_procs, afu->sw_command_status, spap);
 220         cxl_p1n_write(afu, CXL_PSL_SPAP_An, spap);
 221 }
 222
 223 static inline void detach_spa(struct cxl_afu *afu)
 224 {
 225         cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0);
 226 }
 227
 228 void cxl_release_spa(struct cxl_afu *afu)
 229 {
 230         if (afu->spa) {
 231                 free_pages((unsigned long) afu->spa, afu->spa_order);
 232                 afu->spa = NULL;
 233         }
 234 }
 235
 236 int cxl_tlb_slb_invalidate(struct cxl *adapter)
 237 {
 238         unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
 239
 240         pr_devel("CXL adapter wide TLBIA & SLBIA\n");
 241
 242         cxl_p1_write(adapter, CXL_PSL_AFUSEL, CXL_PSL_AFUSEL_A);
 243
 244         cxl_p1_write(adapter, CXL_PSL_TLBIA, CXL_TLB_SLB_IQ_ALL);
 245         while (cxl_p1_read(adapter, CXL_PSL_TLBIA) & CXL_TLB_SLB_P) {
 246                 if (time_after_eq(jiffies, timeout)) {
 247                         dev_warn(&adapter->dev, "WARNING: CXL adapter wide TLBIA timed out!\n");
 248                         return -EBUSY;
 249                 }
 250                 if (!cxl_adapter_link_ok(adapter))
 251                         return -EIO;
 252                 cpu_relax();
 253         }
 254
 255         cxl_p1_write(adapter, CXL_PSL_SLBIA, CXL_TLB_SLB_IQ_ALL);
 256         while (cxl_p1_read(adapter, CXL_PSL_SLBIA) & CXL_TLB_SLB_P) {
 257                 if (time_after_eq(jiffies, timeout)) {
 258                         dev_warn(&adapter->dev, "WARNING: CXL adapter wide SLBIA timed out!\n");
 259                         return -EBUSY;
 260                 }
 261                 if (!cxl_adapter_link_ok(adapter))
 262                         return -EIO;
 263                 cpu_relax();
 264         }
 265         return 0;
 266 }
 267
 268 int cxl_afu_slbia(struct cxl_afu *afu)
 269 {
 270         unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
 271
 272         pr_devel("cxl_afu_slbia issuing SLBIA command\n");
 273         cxl_p2n_write(afu, CXL_SLBIA_An, CXL_TLB_SLB_IQ_ALL);
 274         while (cxl_p2n_read(afu, CXL_SLBIA_An) & CXL_TLB_SLB_P) {
 275                 if (time_after_eq(jiffies, timeout)) {
 276                         dev_warn(&afu->dev, "WARNING: CXL AFU SLBIA timed out!\n");
 277                         return -EBUSY;
 278                 }
 279                 /* If the adapter has gone down, we can assume that we
 280                  * will PERST it and that will invalidate everything.
 281                  */
 282                 if (!cxl_adapter_link_ok(afu->adapter))
 283                         return -EIO;
 284                 cpu_relax();
 285         }
 286         return 0;
 287 }
 288
 289 static int cxl_write_sstp(struct cxl_afu *afu, u64 sstp0, u64 sstp1)
 290 {
 291         int rc;
 292
 293         /* 1. Disable SSTP by writing 0 to SSTP1[V] */
 294         cxl_p2n_write(afu, CXL_SSTP1_An, 0);
 295
 296         /* 2. Invalidate all SLB entries */
 297         if ((rc = cxl_afu_slbia(afu)))
 298                 return rc;
 299
 300         /* 3. Set SSTP0_An */
 301         cxl_p2n_write(afu, CXL_SSTP0_An, sstp0);
 302
 303         /* 4. Set SSTP1_An */
 304         cxl_p2n_write(afu, CXL_SSTP1_An, sstp1);
 305
 306         return 0;
 307 }
 308
 309 /* Using per slice version may improve performance here. (ie. SLBIA_An) */
 310 static void slb_invalid(struct cxl_context *ctx)
 311 {
 312         struct cxl *adapter = ctx->afu->adapter;
 313         u64 slbia;
 314
 315         WARN_ON(!mutex_is_locked(&ctx->afu->spa_mutex));
 316
 317         cxl_p1_write(adapter, CXL_PSL_LBISEL,
 318                         ((u64)be32_to_cpu(ctx->elem->common.pid) << 32) |
 319                         be32_to_cpu(ctx->elem->lpid));
 320         cxl_p1_write(adapter, CXL_PSL_SLBIA, CXL_TLB_SLB_IQ_LPIDPID);
 321
 322         while (1) {
 323                 if (!cxl_adapter_link_ok(adapter))
 324                         break;
 325                 slbia = cxl_p1_read(adapter, CXL_PSL_SLBIA);
 326                 if (!(slbia & CXL_TLB_SLB_P))
 327                         break;
 328                 cpu_relax();
 329         }
 330 }
 331
 332 static int do_process_element_cmd(struct cxl_context *ctx,
 333                                   u64 cmd, u64 pe_state)
 334 {
 335         u64 state;
 336         unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
 337         int rc = 0;
 338
 339         trace_cxl_llcmd(ctx, cmd);
 340
 341         WARN_ON(!ctx->afu->enabled);
 342
 343         ctx->elem->software_state = cpu_to_be32(pe_state);
 344         smp_wmb();
 345         *(ctx->afu->sw_command_status) = cpu_to_be64(cmd | 0 | ctx->pe);
 346         smp_mb();
 347         cxl_p1n_write(ctx->afu, CXL_PSL_LLCMD_An, cmd | ctx->pe);
 348         while (1) {
 349                 if (time_after_eq(jiffies, timeout)) {
 350                         dev_warn(&ctx->afu->dev, "WARNING: Process Element Command timed out!\n");
 351                         rc = -EBUSY;
 352                         goto out;
 353                 }
 354                 if (!cxl_adapter_link_ok(ctx->afu->adapter)) {
 355                         dev_warn(&ctx->afu->dev, "WARNING: Device link down, aborting Process Element Command!\n");
 356                         rc = -EIO;
 357                         goto out;
 358                 }
 359                 state = be64_to_cpup(ctx->afu->sw_command_status);
 360                 if (state == ~0ULL) {
 361                         pr_err("cxl: Error adding process element to AFU\n");
 362                         rc = -1;
 363                         goto out;
 364                 }
 365                 if ((state & (CXL_SPA_SW_CMD_MASK | CXL_SPA_SW_STATE_MASK  | CXL_SPA_SW_LINK_MASK)) ==
 366                     (cmd | (cmd >> 16) | ctx->pe))
 367                         break;
 368                 /*
 369                  * The command won't finish in the PSL if there are
 370                  * outstanding DSIs.  Hence we need to yield here in
 371                  * case there are outstanding DSIs that we need to
 372                  * service.  Tuning possiblity: we could wait for a
 373                  * while before sched
 374                  */
 375                 schedule();
 376
 377         }
 378 out:
 379         trace_cxl_llcmd_done(ctx, cmd, rc);
 380         return rc;
 381 }
 382
 383 static int add_process_element(struct cxl_context *ctx)
 384 {
 385         int rc = 0;
 386
 387         mutex_lock(&ctx->afu->spa_mutex);
 388         pr_devel("%s Adding pe: %i started\n", __func__, ctx->pe);
 389         if (!(rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_ADD, CXL_PE_SOFTWARE_STATE_V)))
 390                 ctx->pe_inserted = true;
 391         pr_devel("%s Adding pe: %i finished\n", __func__, ctx->pe);
 392         mutex_unlock(&ctx->afu->spa_mutex);
 393         return rc;
 394 }
 395
 396 static int terminate_process_element(struct cxl_context *ctx)
 397 {
 398         int rc = 0;
 399
 400         /* fast path terminate if it's already invalid */
 401         if (!(ctx->elem->software_state & cpu_to_be32(CXL_PE_SOFTWARE_STATE_V)))
 402                 return rc;
 403
 404         mutex_lock(&ctx->afu->spa_mutex);
 405         pr_devel("%s Terminate pe: %i started\n", __func__, ctx->pe);
 406         /* We could be asked to terminate when the hw is down. That
 407          * should always succeed: it's not running if the hw has gone
 408          * away and is being reset.
 409          */
 410         if (cxl_adapter_link_ok(ctx->afu->adapter))
 411                 rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_TERMINATE,
 412                                             CXL_PE_SOFTWARE_STATE_V | CXL_PE_SOFTWARE_STATE_T);
 413         ctx->elem->software_state = 0;  /* Remove Valid bit */
 414         pr_devel("%s Terminate pe: %i finished\n", __func__, ctx->pe);
 415         mutex_unlock(&ctx->afu->spa_mutex);
 416         return rc;
 417 }
 418
 419 static int remove_process_element(struct cxl_context *ctx)
 420 {
 421         int rc = 0;
 422
 423         mutex_lock(&ctx->afu->spa_mutex);
 424         pr_devel("%s Remove pe: %i started\n", __func__, ctx->pe);
 425
 426         /* We could be asked to remove when the hw is down. Again, if
 427          * the hw is down, the PE is gone, so we succeed.
 428          */
 429         if (cxl_adapter_link_ok(ctx->afu->adapter))
 430                 rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_REMOVE, 0);
 431
 432         if (!rc)
 433                 ctx->pe_inserted = false;
 434         slb_invalid(ctx);
 435         pr_devel("%s Remove pe: %i finished\n", __func__, ctx->pe);
 436         mutex_unlock(&ctx->afu->spa_mutex);
 437
 438         return rc;
 439 }
 440
 441
 442 void cxl_assign_psn_space(struct cxl_context *ctx)
 443 {
 444         if (!ctx->afu->pp_size || ctx->master) {
 445                 ctx->psn_phys = ctx->afu->psn_phys;
 446                 ctx->psn_size = ctx->afu->adapter->ps_size;
 447         } else {
 448                 ctx->psn_phys = ctx->afu->psn_phys +
 449                         (ctx->afu->pp_offset + ctx->afu->pp_size * ctx->pe);
 450                 ctx->psn_size = ctx->afu->pp_size;
 451         }
 452 }
 453
 454 static int activate_afu_directed(struct cxl_afu *afu)
 455 {
 456         int rc;
 457
 458         dev_info(&afu->dev, "Activating AFU directed mode\n");
 459
 460         afu->num_procs = afu->max_procs_virtualised;
 461         if (afu->spa == NULL) {
 462                 if (cxl_alloc_spa(afu))
 463                         return -ENOMEM;
 464         }
 465         attach_spa(afu);
 466
 467         cxl_p1n_write(afu, CXL_PSL_SCNTL_An, CXL_PSL_SCNTL_An_PM_AFU);
 468         cxl_p1n_write(afu, CXL_PSL_AMOR_An, 0xFFFFFFFFFFFFFFFFULL);
 469         cxl_p1n_write(afu, CXL_PSL_ID_An, CXL_PSL_ID_An_F | CXL_PSL_ID_An_L);
 470
 471         afu->current_mode = CXL_MODE_DIRECTED;
 472
 473         if ((rc = cxl_chardev_m_afu_add(afu)))
 474                 return rc;
 475
 476         if ((rc = cxl_sysfs_afu_m_add(afu)))
 477                 goto err;
 478
 479         if ((rc = cxl_chardev_s_afu_add(afu)))
 480                 goto err1;
 481
 482         return 0;
 483 err1:
 484         cxl_sysfs_afu_m_remove(afu);
 485 err:
 486         cxl_chardev_afu_remove(afu);
 487         return rc;
 488 }
 489
 490 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 491 #define set_endian(sr) ((sr) |= CXL_PSL_SR_An_LE)
 492 #else
 493 #define set_endian(sr) ((sr) &= ~(CXL_PSL_SR_An_LE))
 494 #endif
 495
 496 static u64 calculate_sr(struct cxl_context *ctx)
 497 {
 498         u64 sr = 0;
 499
 500         if (ctx->master)
 501                 sr |= CXL_PSL_SR_An_MP;
 502         if (mfspr(SPRN_LPCR) & LPCR_TC)
 503                 sr |= CXL_PSL_SR_An_TC;
 504         if (ctx->kernel) {
 505                 sr |= CXL_PSL_SR_An_R | (mfmsr() & MSR_SF);
 506                 sr |= CXL_PSL_SR_An_HV;
 507         } else {
 508                 sr |= CXL_PSL_SR_An_PR | CXL_PSL_SR_An_R;
 509                 set_endian(sr);
 510                 sr &= ~(CXL_PSL_SR_An_HV);
 511                 if (!test_tsk_thread_flag(current, TIF_32BIT))
 512                         sr |= CXL_PSL_SR_An_SF;
 513         }
 514         return sr;
 515 }
 516
 517 static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
 518 {
 519         u32 pid;
 520         int r, result;
 521
 522         cxl_assign_psn_space(ctx);
 523
 524         ctx->elem->ctxtime = 0; /* disable */
 525         ctx->elem->lpid = cpu_to_be32(mfspr(SPRN_LPID));
 526         ctx->elem->haurp = 0; /* disable */
 527         ctx->elem->sdr = cpu_to_be64(mfspr(SPRN_SDR1));
 528
 529         pid = current->pid;
 530         if (ctx->kernel)
 531                 pid = 0;
 532         ctx->elem->common.tid = 0;
 533         ctx->elem->common.pid = cpu_to_be32(pid);
 534
 535         ctx->elem->sr = cpu_to_be64(calculate_sr(ctx));
 536
 537         ctx->elem->common.csrp = 0; /* disable */
 538         ctx->elem->common.aurp0 = 0; /* disable */
 539         ctx->elem->common.aurp1 = 0; /* disable */
 540
 541         cxl_prefault(ctx, wed);
 542
 543         ctx->elem->common.sstp0 = cpu_to_be64(ctx->sstp0);
 544         ctx->elem->common.sstp1 = cpu_to_be64(ctx->sstp1);
 545
 546         for (r = 0; r < CXL_IRQ_RANGES; r++) {
 547                 ctx->elem->ivte_offsets[r] = cpu_to_be16(ctx->irqs.offset[r]);
 548                 ctx->elem->ivte_ranges[r] = cpu_to_be16(ctx->irqs.range[r]);
 549         }
 550
 551         ctx->elem->common.amr = cpu_to_be64(amr);
 552         ctx->elem->common.wed = cpu_to_be64(wed);
 553
 554         /* first guy needs to enable */
 555         if ((result = cxl_afu_check_and_enable(ctx->afu)))
 556                 return result;
 557
 558         return add_process_element(ctx);
 559 }
 560
 561 static int deactivate_afu_directed(struct cxl_afu *afu)
 562 {
 563         dev_info(&afu->dev, "Deactivating AFU directed mode\n");
 564
 565         afu->current_mode = 0;
 566         afu->num_procs = 0;
 567
 568         cxl_sysfs_afu_m_remove(afu);
 569         cxl_chardev_afu_remove(afu);
 570
 571         __cxl_afu_reset(afu);
 572         cxl_afu_disable(afu);
 573         cxl_psl_purge(afu);
 574
 575         return 0;
 576 }
 577
 578 static int activate_dedicated_process(struct cxl_afu *afu)
 579 {
 580         dev_info(&afu->dev, "Activating dedicated process mode\n");
 581
 582         cxl_p1n_write(afu, CXL_PSL_SCNTL_An, CXL_PSL_SCNTL_An_PM_Process);
 583
 584         cxl_p1n_write(afu, CXL_PSL_CtxTime_An, 0); /* disable */
 585         cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0);    /* disable */
 586         cxl_p1n_write(afu, CXL_PSL_AMOR_An, 0xFFFFFFFFFFFFFFFFULL);
 587         cxl_p1n_write(afu, CXL_PSL_LPID_An, mfspr(SPRN_LPID));
 588         cxl_p1n_write(afu, CXL_HAURP_An, 0);       /* disable */
 589         cxl_p1n_write(afu, CXL_PSL_SDR_An, mfspr(SPRN_SDR1));
 590
 591         cxl_p2n_write(afu, CXL_CSRP_An, 0);        /* disable */
 592         cxl_p2n_write(afu, CXL_AURP0_An, 0);       /* disable */
 593         cxl_p2n_write(afu, CXL_AURP1_An, 0);       /* disable */
 594
 595         afu->current_mode = CXL_MODE_DEDICATED;
 596         afu->num_procs = 1;
 597
 598         return cxl_chardev_d_afu_add(afu);
 599 }
 600
 601 static int attach_dedicated(struct cxl_context *ctx, u64 wed, u64 amr)
 602 {
 603         struct cxl_afu *afu = ctx->afu;
 604         u64 pid;
 605         int rc;
 606
 607         pid = (u64)current->pid << 32;
 608         if (ctx->kernel)
 609                 pid = 0;
 610         cxl_p2n_write(afu, CXL_PSL_PID_TID_An, pid);
 611
 612         cxl_p1n_write(afu, CXL_PSL_SR_An, calculate_sr(ctx));
 613
 614         if ((rc = cxl_write_sstp(afu, ctx->sstp0, ctx->sstp1)))
 615                 return rc;
 616
 617         cxl_prefault(ctx, wed);
 618
 619         cxl_p1n_write(afu, CXL_PSL_IVTE_Offset_An,
 620                        (((u64)ctx->irqs.offset[0] & 0xffff) << 48) |
 621                        (((u64)ctx->irqs.offset[1] & 0xffff) << 32) |
 622                        (((u64)ctx->irqs.offset[2] & 0xffff) << 16) |
 623                         ((u64)ctx->irqs.offset[3] & 0xffff));
 624         cxl_p1n_write(afu, CXL_PSL_IVTE_Limit_An, (u64)
 625                        (((u64)ctx->irqs.range[0] & 0xffff) << 48) |
 626                        (((u64)ctx->irqs.range[1] & 0xffff) << 32) |
 627                        (((u64)ctx->irqs.range[2] & 0xffff) << 16) |
 628                         ((u64)ctx->irqs.range[3] & 0xffff));
 629
 630         cxl_p2n_write(afu, CXL_PSL_AMR_An, amr);
 631
 632         /* master only context for dedicated */
 633         cxl_assign_psn_space(ctx);
 634
 635         if ((rc = __cxl_afu_reset(afu)))
 636                 return rc;
 637
 638         cxl_p2n_write(afu, CXL_PSL_WED_An, wed);
 639
 640         return afu_enable(afu);
 641 }
 642
 643 static int deactivate_dedicated_process(struct cxl_afu *afu)
 644 {
 645         dev_info(&afu->dev, "Deactivating dedicated process mode\n");
 646
 647         afu->current_mode = 0;
 648         afu->num_procs = 0;
 649
 650         cxl_chardev_afu_remove(afu);
 651
 652         return 0;
 653 }
 654
 655 int _cxl_afu_deactivate_mode(struct cxl_afu *afu, int mode)
 656 {
 657         if (mode == CXL_MODE_DIRECTED)
 658                 return deactivate_afu_directed(afu);
 659         if (mode == CXL_MODE_DEDICATED)
 660                 return deactivate_dedicated_process(afu);
 661         return 0;
 662 }
 663
 664 int cxl_afu_deactivate_mode(struct cxl_afu *afu)
 665 {
 666         return _cxl_afu_deactivate_mode(afu, afu->current_mode);
 667 }
 668
 669 int cxl_afu_activate_mode(struct cxl_afu *afu, int mode)
 670 {
 671         if (!mode)
 672                 return 0;
 673         if (!(mode & afu->modes_supported))
 674                 return -EINVAL;
 675
 676         if (!cxl_adapter_link_ok(afu->adapter)) {
 677                 WARN(1, "Device link is down, refusing to activate!\n");
 678                 return -EIO;
 679         }
 680
 681         if (mode == CXL_MODE_DIRECTED)
 682                 return activate_afu_directed(afu);
 683         if (mode == CXL_MODE_DEDICATED)
 684                 return activate_dedicated_process(afu);
 685
 686         return -EINVAL;
 687 }
 688
 689 int cxl_attach_process(struct cxl_context *ctx, bool kernel, u64 wed, u64 amr)
 690 {
 691         if (!cxl_adapter_link_ok(ctx->afu->adapter)) {
 692                 WARN(1, "Device link is down, refusing to attach process!\n");
 693                 return -EIO;
 694         }
 695
 696         ctx->kernel = kernel;
 697         if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
 698                 return attach_afu_directed(ctx, wed, amr);
 699
 700         if (ctx->afu->current_mode == CXL_MODE_DEDICATED)
 701                 return attach_dedicated(ctx, wed, amr);
 702
 703         return -EINVAL;
 704 }
 705
 706 static inline int detach_process_native_dedicated(struct cxl_context *ctx)
 707 {
 708         __cxl_afu_reset(ctx->afu);
 709         cxl_afu_disable(ctx->afu);
 710         cxl_psl_purge(ctx->afu);
 711         return 0;
 712 }
 713
 714 static inline int detach_process_native_afu_directed(struct cxl_context *ctx)
 715 {
 716         if (!ctx->pe_inserted)
 717                 return 0;
 718         if (terminate_process_element(ctx))
 719                 return -1;
 720         if (remove_process_element(ctx))
 721                 return -1;
 722
 723         return 0;
 724 }
 725
 726 int cxl_detach_process(struct cxl_context *ctx)
 727 {
 728         trace_cxl_detach(ctx);
 729
 730         if (ctx->afu->current_mode == CXL_MODE_DEDICATED)
 731                 return detach_process_native_dedicated(ctx);
 732
 733         return detach_process_native_afu_directed(ctx);
 734 }
 735
 736 int cxl_get_irq(struct cxl_afu *afu, struct cxl_irq_info *info)
 737 {
 738         u64 pidtid;
 739
 740         /* If the adapter has gone away, we can't get any meaningful
 741          * information.
 742          */
 743         if (!cxl_adapter_link_ok(afu->adapter))
 744                 return -EIO;
 745
 746         info->dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
 747         info->dar = cxl_p2n_read(afu, CXL_PSL_DAR_An);
 748         info->dsr = cxl_p2n_read(afu, CXL_PSL_DSR_An);
 749         pidtid = cxl_p2n_read(afu, CXL_PSL_PID_TID_An);
 750         info->pid = pidtid >> 32;
 751         info->tid = pidtid & 0xffffffff;
 752         info->afu_err = cxl_p2n_read(afu, CXL_AFU_ERR_An);
 753         info->errstat = cxl_p2n_read(afu, CXL_PSL_ErrStat_An);
 754
 755         return 0;
 756 }
 757
 758 static void recover_psl_err(struct cxl_afu *afu, u64 errstat)
 759 {
 760         u64 dsisr;
 761
 762         pr_devel("RECOVERING FROM PSL ERROR... (0x%016llx)\n", errstat);
 763
 764         /* Clear PSL_DSISR[PE] */
 765         dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
 766         cxl_p2n_write(afu, CXL_PSL_DSISR_An, dsisr & ~CXL_PSL_DSISR_An_PE);
 767
 768         /* Write 1s to clear error status bits */
 769         cxl_p2n_write(afu, CXL_PSL_ErrStat_An, errstat);
 770 }
 771
 772 int cxl_ack_irq(struct cxl_context *ctx, u64 tfc, u64 psl_reset_mask)
 773 {
 774         trace_cxl_psl_irq_ack(ctx, tfc);
 775         if (tfc)
 776                 cxl_p2n_write(ctx->afu, CXL_PSL_TFC_An, tfc);
 777         if (psl_reset_mask)
 778                 recover_psl_err(ctx->afu, psl_reset_mask);
 779
 780         return 0;
 781 }
 782
 783 int cxl_check_error(struct cxl_afu *afu)
 784 {
 785         return (cxl_p1n_read(afu, CXL_PSL_SCNTL_An) == ~0ULL);
 786 }