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