drivers/crypto/caam/qi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * CAAM/SEC 4.x QI transport/backend driver
   4  * Queue Interface backend functionality
   5  *
   6  * Copyright 2013-2016 Freescale Semiconductor, Inc.
   7  * Copyright 2016-2017, 2019-2020 NXP
   8  */
   9
  10 #include <linux/cpumask.h>
  11 #include <linux/kthread.h>
  12 #include <soc/fsl/qman.h>
  13
  14 #include "regs.h"
  15 #include "qi.h"
  16 #include "desc.h"
  17 #include "intern.h"
  18 #include "desc_constr.h"
  19
  20 #define PREHDR_RSLS_SHIFT       31
  21 #define PREHDR_ABS              BIT(25)
  22
  23 /*
  24  * Use a reasonable backlog of frames (per CPU) as congestion threshold,
  25  * so that resources used by the in-flight buffers do not become a memory hog.
  26  */
  27 #define MAX_RSP_FQ_BACKLOG_PER_CPU      256
  28
  29 #define CAAM_QI_ENQUEUE_RETRIES 10000
  30
  31 #define CAAM_NAPI_WEIGHT        63
  32
  33 /*
  34  * caam_napi - struct holding CAAM NAPI-related params
  35  * @irqtask: IRQ task for QI backend
  36  * @p: QMan portal
  37  */
  38 struct caam_napi {
  39         struct napi_struct irqtask;
  40         struct qman_portal *p;
  41 };
  42
  43 /*
  44  * caam_qi_pcpu_priv - percpu private data structure to main list of pending
  45  *                     responses expected on each cpu.
  46  * @caam_napi: CAAM NAPI params
  47  * @net_dev: netdev used by NAPI
  48  * @rsp_fq: response FQ from CAAM
  49  */
  50 struct caam_qi_pcpu_priv {
  51         struct caam_napi caam_napi;
  52         struct net_device net_dev;
  53         struct qman_fq *rsp_fq;
  54 } ____cacheline_aligned;
  55
  56 static DEFINE_PER_CPU(struct caam_qi_pcpu_priv, pcpu_qipriv);
  57 static DEFINE_PER_CPU(int, last_cpu);
  58
  59 /*
  60  * caam_qi_priv - CAAM QI backend private params
  61  * @cgr: QMan congestion group
  62  */
  63 struct caam_qi_priv {
  64         struct qman_cgr cgr;
  65 };
  66
  67 static struct caam_qi_priv qipriv ____cacheline_aligned;
  68
  69 /*
  70  * This is written by only one core - the one that initialized the CGR - and
  71  * read by multiple cores (all the others).
  72  */
  73 bool caam_congested __read_mostly;
  74 EXPORT_SYMBOL(caam_congested);
  75
  76 #ifdef CONFIG_DEBUG_FS
  77 /*
  78  * This is a counter for the number of times the congestion group (where all
  79  * the request and response queueus are) reached congestion. Incremented
  80  * each time the congestion callback is called with congested == true.
  81  */
  82 static u64 times_congested;
  83 #endif
  84
  85 /*
  86  * This is a a cache of buffers, from which the users of CAAM QI driver
  87  * can allocate short (CAAM_QI_MEMCACHE_SIZE) buffers. It's faster than
  88  * doing malloc on the hotpath.
  89  * NOTE: A more elegant solution would be to have some headroom in the frames
  90  *       being processed. This could be added by the dpaa-ethernet driver.
  91  *       This would pose a problem for userspace application processing which
  92  *       cannot know of this limitation. So for now, this will work.
  93  * NOTE: The memcache is SMP-safe. No need to handle spinlocks in-here
  94  */
  95 static struct kmem_cache *qi_cache;
  96
  97 static void *caam_iova_to_virt(struct iommu_domain *domain,
  98                                dma_addr_t iova_addr)
  99 {
 100         phys_addr_t phys_addr;
 101
 102         phys_addr = domain ? iommu_iova_to_phys(domain, iova_addr) : iova_addr;
 103
 104         return phys_to_virt(phys_addr);
 105 }
 106
 107 int caam_qi_enqueue(struct device *qidev, struct caam_drv_req *req)
 108 {
 109         struct qm_fd fd;
 110         dma_addr_t addr;
 111         int ret;
 112         int num_retries = 0;
 113
 114         qm_fd_clear_fd(&fd);
 115         qm_fd_set_compound(&fd, qm_sg_entry_get_len(&req->fd_sgt[1]));
 116
 117         addr = dma_map_single(qidev, req->fd_sgt, sizeof(req->fd_sgt),
 118                               DMA_BIDIRECTIONAL);
 119         if (dma_mapping_error(qidev, addr)) {
 120                 dev_err(qidev, "DMA mapping error for QI enqueue request\n");
 121                 return -EIO;
 122         }
 123         qm_fd_addr_set64(&fd, addr);
 124
 125         do {
 126                 ret = qman_enqueue(req->drv_ctx->req_fq, &fd);
 127                 if (likely(!ret)) {
 128                         refcount_inc(&req->drv_ctx->refcnt);
 129                         return 0;
 130                 }
 131
 132                 if (ret != -EBUSY)
 133                         break;
 134                 num_retries++;
 135         } while (num_retries < CAAM_QI_ENQUEUE_RETRIES);
 136
 137         dev_err(qidev, "qman_enqueue failed: %d\n", ret);
 138
 139         return ret;
 140 }
 141 EXPORT_SYMBOL(caam_qi_enqueue);
 142
 143 static void caam_fq_ern_cb(struct qman_portal *qm, struct qman_fq *fq,
 144                            const union qm_mr_entry *msg)
 145 {
 146         const struct qm_fd *fd;
 147         struct caam_drv_req *drv_req;
 148         struct device *qidev = &(raw_cpu_ptr(&pcpu_qipriv)->net_dev.dev);
 149         struct caam_drv_private *priv = dev_get_drvdata(qidev);
 150
 151         fd = &msg->ern.fd;
 152
 153         drv_req = caam_iova_to_virt(priv->domain, qm_fd_addr_get64(fd));
 154         if (!drv_req) {
 155                 dev_err(qidev,
 156                         "Can't find original request for CAAM response\n");
 157                 return;
 158         }
 159
 160         refcount_dec(&drv_req->drv_ctx->refcnt);
 161
 162         if (qm_fd_get_format(fd) != qm_fd_compound) {
 163                 dev_err(qidev, "Non-compound FD from CAAM\n");
 164                 return;
 165         }
 166
 167         dma_unmap_single(drv_req->drv_ctx->qidev, qm_fd_addr(fd),
 168                          sizeof(drv_req->fd_sgt), DMA_BIDIRECTIONAL);
 169
 170         if (fd->status)
 171                 drv_req->cbk(drv_req, be32_to_cpu(fd->status));
 172         else
 173                 drv_req->cbk(drv_req, JRSTA_SSRC_QI);
 174 }
 175
 176 static struct qman_fq *create_caam_req_fq(struct device *qidev,
 177                                           struct qman_fq *rsp_fq,
 178                                           dma_addr_t hwdesc,
 179                                           int fq_sched_flag)
 180 {
 181         int ret;
 182         struct qman_fq *req_fq;
 183         struct qm_mcc_initfq opts;
 184
 185         req_fq = kzalloc(sizeof(*req_fq), GFP_ATOMIC);
 186         if (!req_fq)
 187                 return ERR_PTR(-ENOMEM);
 188
 189         req_fq->cb.ern = caam_fq_ern_cb;
 190         req_fq->cb.fqs = NULL;
 191
 192         ret = qman_create_fq(0, QMAN_FQ_FLAG_DYNAMIC_FQID |
 193                                 QMAN_FQ_FLAG_TO_DCPORTAL, req_fq);
 194         if (ret) {
 195                 dev_err(qidev, "Failed to create session req FQ\n");
 196                 goto create_req_fq_fail;
 197         }
 198
 199         memset(&opts, 0, sizeof(opts));
 200         opts.we_mask = cpu_to_be16(QM_INITFQ_WE_FQCTRL | QM_INITFQ_WE_DESTWQ |
 201                                    QM_INITFQ_WE_CONTEXTB |
 202                                    QM_INITFQ_WE_CONTEXTA | QM_INITFQ_WE_CGID);
 203         opts.fqd.fq_ctrl = cpu_to_be16(QM_FQCTRL_CPCSTASH | QM_FQCTRL_CGE);
 204         qm_fqd_set_destwq(&opts.fqd, qm_channel_caam, 2);
 205         opts.fqd.context_b = cpu_to_be32(qman_fq_fqid(rsp_fq));
 206         qm_fqd_context_a_set64(&opts.fqd, hwdesc);
 207         opts.fqd.cgid = qipriv.cgr.cgrid;
 208
 209         ret = qman_init_fq(req_fq, fq_sched_flag, &opts);
 210         if (ret) {
 211                 dev_err(qidev, "Failed to init session req FQ\n");
 212                 goto init_req_fq_fail;
 213         }
 214
 215         dev_dbg(qidev, "Allocated request FQ %u for CPU %u\n", req_fq->fqid,
 216                 smp_processor_id());
 217         return req_fq;
 218
 219 init_req_fq_fail:
 220         qman_destroy_fq(req_fq);
 221 create_req_fq_fail:
 222         kfree(req_fq);
 223         return ERR_PTR(ret);
 224 }
 225
 226 static int empty_retired_fq(struct device *qidev, struct qman_fq *fq)
 227 {
 228         int ret;
 229
 230         ret = qman_volatile_dequeue(fq, QMAN_VOLATILE_FLAG_WAIT_INT |
 231                                     QMAN_VOLATILE_FLAG_FINISH,
 232                                     QM_VDQCR_PRECEDENCE_VDQCR |
 233                                     QM_VDQCR_NUMFRAMES_TILLEMPTY);
 234         if (ret) {
 235                 dev_err(qidev, "Volatile dequeue fail for FQ: %u\n", fq->fqid);
 236                 return ret;
 237         }
 238
 239         do {
 240                 struct qman_portal *p;
 241
 242                 p = qman_get_affine_portal(smp_processor_id());
 243                 qman_p_poll_dqrr(p, 16);
 244         } while (fq->flags & QMAN_FQ_STATE_NE);
 245
 246         return 0;
 247 }
 248
 249 static int kill_fq(struct device *qidev, struct qman_fq *fq)
 250 {
 251         u32 flags;
 252         int ret;
 253
 254         ret = qman_retire_fq(fq, &flags);
 255         if (ret < 0) {
 256                 dev_err(qidev, "qman_retire_fq failed: %d\n", ret);
 257                 return ret;
 258         }
 259
 260         if (!ret)
 261                 goto empty_fq;
 262
 263         /* Async FQ retirement condition */
 264         if (ret == 1) {
 265                 /* Retry till FQ gets in retired state */
 266                 do {
 267                         msleep(20);
 268                 } while (fq->state != qman_fq_state_retired);
 269
 270                 WARN_ON(fq->flags & QMAN_FQ_STATE_BLOCKOOS);
 271                 WARN_ON(fq->flags & QMAN_FQ_STATE_ORL);
 272         }
 273
 274 empty_fq:
 275         if (fq->flags & QMAN_FQ_STATE_NE) {
 276                 ret = empty_retired_fq(qidev, fq);
 277                 if (ret) {
 278                         dev_err(qidev, "empty_retired_fq fail for FQ: %u\n",
 279                                 fq->fqid);
 280                         return ret;
 281                 }
 282         }
 283
 284         ret = qman_oos_fq(fq);
 285         if (ret)
 286                 dev_err(qidev, "OOS of FQID: %u failed\n", fq->fqid);
 287
 288         qman_destroy_fq(fq);
 289         kfree(fq);
 290
 291         return ret;
 292 }
 293
 294 static int empty_caam_fq(struct qman_fq *fq, struct caam_drv_ctx *drv_ctx)
 295 {
 296         int ret;
 297         int retries = 10;
 298         struct qm_mcr_queryfq_np np;
 299
 300         /* Wait till the older CAAM FQ get empty */
 301         do {
 302                 ret = qman_query_fq_np(fq, &np);
 303                 if (ret)
 304                         return ret;
 305
 306                 if (!qm_mcr_np_get(&np, frm_cnt))
 307                         break;
 308
 309                 msleep(20);
 310         } while (1);
 311
 312         /* Wait until pending jobs from this FQ are processed by CAAM */
 313         do {
 314                 if (refcount_read(&drv_ctx->refcnt) == 1)
 315                         break;
 316
 317                 msleep(20);
 318         } while (--retries);
 319
 320         if (!retries)
 321                 dev_warn_once(drv_ctx->qidev, "%d frames from FQID %u still pending in CAAM\n",
 322                               refcount_read(&drv_ctx->refcnt), fq->fqid);
 323
 324         return 0;
 325 }
 326
 327 int caam_drv_ctx_update(struct caam_drv_ctx *drv_ctx, u32 *sh_desc)
 328 {
 329         int ret;
 330         u32 num_words;
 331         struct qman_fq *new_fq, *old_fq;
 332         struct device *qidev = drv_ctx->qidev;
 333
 334         num_words = desc_len(sh_desc);
 335         if (num_words > MAX_SDLEN) {
 336                 dev_err(qidev, "Invalid descriptor len: %d words\n", num_words);
 337                 return -EINVAL;
 338         }
 339
 340         /* Note down older req FQ */
 341         old_fq = drv_ctx->req_fq;
 342
 343         /* Create a new req FQ in parked state */
 344         new_fq = create_caam_req_fq(drv_ctx->qidev, drv_ctx->rsp_fq,
 345                                     drv_ctx->context_a, 0);
 346         if (IS_ERR(new_fq)) {
 347                 dev_err(qidev, "FQ allocation for shdesc update failed\n");
 348                 return PTR_ERR(new_fq);
 349         }
 350
 351         /* Hook up new FQ to context so that new requests keep queuing */
 352         drv_ctx->req_fq = new_fq;
 353
 354         /* Empty and remove the older FQ */
 355         ret = empty_caam_fq(old_fq, drv_ctx);
 356         if (ret) {
 357                 dev_err(qidev, "Old CAAM FQ empty failed: %d\n", ret);
 358
 359                 /* We can revert to older FQ */
 360                 drv_ctx->req_fq = old_fq;
 361
 362                 if (kill_fq(qidev, new_fq))
 363                         dev_warn(qidev, "New CAAM FQ kill failed\n");
 364
 365                 return ret;
 366         }
 367
 368         /*
 369          * Re-initialise pre-header. Set RSLS and SDLEN.
 370          * Update the shared descriptor for driver context.
 371          */
 372         drv_ctx->prehdr[0] = cpu_to_caam32((1 << PREHDR_RSLS_SHIFT) |
 373                                            num_words);
 374         drv_ctx->prehdr[1] = cpu_to_caam32(PREHDR_ABS);
 375         memcpy(drv_ctx->sh_desc, sh_desc, desc_bytes(sh_desc));
 376         dma_sync_single_for_device(qidev, drv_ctx->context_a,
 377                                    sizeof(drv_ctx->sh_desc) +
 378                                    sizeof(drv_ctx->prehdr),
 379                                    DMA_BIDIRECTIONAL);
 380
 381         /* Put the new FQ in scheduled state */
 382         ret = qman_schedule_fq(new_fq);
 383         if (ret) {
 384                 dev_err(qidev, "Fail to sched new CAAM FQ, ecode = %d\n", ret);
 385
 386                 /*
 387                  * We can kill new FQ and revert to old FQ.
 388                  * Since the desc is already modified, it is success case
 389                  */
 390
 391                 drv_ctx->req_fq = old_fq;
 392
 393                 if (kill_fq(qidev, new_fq))
 394                         dev_warn(qidev, "New CAAM FQ kill failed\n");
 395         } else if (kill_fq(qidev, old_fq)) {
 396                 dev_warn(qidev, "Old CAAM FQ kill failed\n");
 397         }
 398
 399         return 0;
 400 }
 401 EXPORT_SYMBOL(caam_drv_ctx_update);
 402
 403 struct caam_drv_ctx *caam_drv_ctx_init(struct device *qidev,
 404                                        int *cpu,
 405                                        u32 *sh_desc)
 406 {
 407         size_t size;
 408         u32 num_words;
 409         dma_addr_t hwdesc;
 410         struct caam_drv_ctx *drv_ctx;
 411         const cpumask_t *cpus = qman_affine_cpus();
 412
 413         num_words = desc_len(sh_desc);
 414         if (num_words > MAX_SDLEN) {
 415                 dev_err(qidev, "Invalid descriptor len: %d words\n",
 416                         num_words);
 417                 return ERR_PTR(-EINVAL);
 418         }
 419
 420         drv_ctx = kzalloc(sizeof(*drv_ctx), GFP_ATOMIC);
 421         if (!drv_ctx)
 422                 return ERR_PTR(-ENOMEM);
 423
 424         /*
 425          * Initialise pre-header - set RSLS and SDLEN - and shared descriptor
 426          * and dma-map them.
 427          */
 428         drv_ctx->prehdr[0] = cpu_to_caam32((1 << PREHDR_RSLS_SHIFT) |
 429                                            num_words);
 430         drv_ctx->prehdr[1] = cpu_to_caam32(PREHDR_ABS);
 431         memcpy(drv_ctx->sh_desc, sh_desc, desc_bytes(sh_desc));
 432         size = sizeof(drv_ctx->prehdr) + sizeof(drv_ctx->sh_desc);
 433         hwdesc = dma_map_single(qidev, drv_ctx->prehdr, size,
 434                                 DMA_BIDIRECTIONAL);
 435         if (dma_mapping_error(qidev, hwdesc)) {
 436                 dev_err(qidev, "DMA map error for preheader + shdesc\n");
 437                 kfree(drv_ctx);
 438                 return ERR_PTR(-ENOMEM);
 439         }
 440         drv_ctx->context_a = hwdesc;
 441
 442         /* If given CPU does not own the portal, choose another one that does */
 443         if (!cpumask_test_cpu(*cpu, cpus)) {
 444                 int *pcpu = &get_cpu_var(last_cpu);
 445
 446                 *pcpu = cpumask_next(*pcpu, cpus);
 447                 if (*pcpu >= nr_cpu_ids)
 448                         *pcpu = cpumask_first(cpus);
 449                 *cpu = *pcpu;
 450
 451                 put_cpu_var(last_cpu);
 452         }
 453         drv_ctx->cpu = *cpu;
 454
 455         /* Find response FQ hooked with this CPU */
 456         drv_ctx->rsp_fq = per_cpu(pcpu_qipriv.rsp_fq, drv_ctx->cpu);
 457
 458         /* Attach request FQ */
 459         drv_ctx->req_fq = create_caam_req_fq(qidev, drv_ctx->rsp_fq, hwdesc,
 460                                              QMAN_INITFQ_FLAG_SCHED);
 461         if (IS_ERR(drv_ctx->req_fq)) {
 462                 dev_err(qidev, "create_caam_req_fq failed\n");
 463                 dma_unmap_single(qidev, hwdesc, size, DMA_BIDIRECTIONAL);
 464                 kfree(drv_ctx);
 465                 return ERR_PTR(-ENOMEM);
 466         }
 467
 468         /* init reference counter used to track references to request FQ */
 469         refcount_set(&drv_ctx->refcnt, 1);
 470
 471         drv_ctx->qidev = qidev;
 472         return drv_ctx;
 473 }
 474 EXPORT_SYMBOL(caam_drv_ctx_init);
 475
 476 void *qi_cache_alloc(gfp_t flags)
 477 {
 478         return kmem_cache_alloc(qi_cache, flags);
 479 }
 480 EXPORT_SYMBOL(qi_cache_alloc);
 481
 482 void qi_cache_free(void *obj)
 483 {
 484         kmem_cache_free(qi_cache, obj);
 485 }
 486 EXPORT_SYMBOL(qi_cache_free);
 487
 488 static int caam_qi_poll(struct napi_struct *napi, int budget)
 489 {
 490         struct caam_napi *np = container_of(napi, struct caam_napi, irqtask);
 491
 492         int cleaned = qman_p_poll_dqrr(np->p, budget);
 493
 494         if (cleaned < budget) {
 495                 napi_complete(napi);
 496                 qman_p_irqsource_add(np->p, QM_PIRQ_DQRI);
 497         }
 498
 499         return cleaned;
 500 }
 501
 502 void caam_drv_ctx_rel(struct caam_drv_ctx *drv_ctx)
 503 {
 504         if (IS_ERR_OR_NULL(drv_ctx))
 505                 return;
 506
 507         /* Remove request FQ */
 508         if (kill_fq(drv_ctx->qidev, drv_ctx->req_fq))
 509                 dev_err(drv_ctx->qidev, "Crypto session req FQ kill failed\n");
 510
 511         dma_unmap_single(drv_ctx->qidev, drv_ctx->context_a,
 512                          sizeof(drv_ctx->sh_desc) + sizeof(drv_ctx->prehdr),
 513                          DMA_BIDIRECTIONAL);
 514         kfree(drv_ctx);
 515 }
 516 EXPORT_SYMBOL(caam_drv_ctx_rel);
 517
 518 static void caam_qi_shutdown(void *data)
 519 {
 520         int i;
 521         struct device *qidev = data;
 522         struct caam_qi_priv *priv = &qipriv;
 523         const cpumask_t *cpus = qman_affine_cpus();
 524
 525         for_each_cpu(i, cpus) {
 526                 struct napi_struct *irqtask;
 527
 528                 irqtask = &per_cpu_ptr(&pcpu_qipriv.caam_napi, i)->irqtask;
 529                 napi_disable(irqtask);
 530                 netif_napi_del(irqtask);
 531
 532                 if (kill_fq(qidev, per_cpu(pcpu_qipriv.rsp_fq, i)))
 533                         dev_err(qidev, "Rsp FQ kill failed, cpu: %d\n", i);
 534         }
 535
 536         qman_delete_cgr_safe(&priv->cgr);
 537         qman_release_cgrid(priv->cgr.cgrid);
 538
 539         kmem_cache_destroy(qi_cache);
 540 }
 541
 542 static void cgr_cb(struct qman_portal *qm, struct qman_cgr *cgr, int congested)
 543 {
 544         caam_congested = congested;
 545
 546         if (congested) {
 547 #ifdef CONFIG_DEBUG_FS
 548                 times_congested++;
 549 #endif
 550                 pr_debug_ratelimited("CAAM entered congestion\n");
 551
 552         } else {
 553                 pr_debug_ratelimited("CAAM exited congestion\n");
 554         }
 555 }
 556
 557 static int caam_qi_napi_schedule(struct qman_portal *p, struct caam_napi *np)
 558 {
 559         /*
 560          * In case of threaded ISR, for RT kernels in_irq() does not return
 561          * appropriate value, so use in_serving_softirq to distinguish between
 562          * softirq and irq contexts.
 563          */
 564         if (unlikely(in_irq() || !in_serving_softirq())) {
 565                 /* Disable QMan IRQ source and invoke NAPI */
 566                 qman_p_irqsource_remove(p, QM_PIRQ_DQRI);
 567                 np->p = p;
 568                 napi_schedule(&np->irqtask);
 569                 return 1;
 570         }
 571         return 0;
 572 }
 573
 574 static enum qman_cb_dqrr_result caam_rsp_fq_dqrr_cb(struct qman_portal *p,
 575                                                     struct qman_fq *rsp_fq,
 576                                                     const struct qm_dqrr_entry *dqrr)
 577 {
 578         struct caam_napi *caam_napi = raw_cpu_ptr(&pcpu_qipriv.caam_napi);
 579         struct caam_drv_req *drv_req;
 580         const struct qm_fd *fd;
 581         struct device *qidev = &(raw_cpu_ptr(&pcpu_qipriv)->net_dev.dev);
 582         struct caam_drv_private *priv = dev_get_drvdata(qidev);
 583         u32 status;
 584
 585         if (caam_qi_napi_schedule(p, caam_napi))
 586                 return qman_cb_dqrr_stop;
 587
 588         fd = &dqrr->fd;
 589
 590         drv_req = caam_iova_to_virt(priv->domain, qm_fd_addr_get64(fd));
 591         if (unlikely(!drv_req)) {
 592                 dev_err(qidev,
 593                         "Can't find original request for caam response\n");
 594                 return qman_cb_dqrr_consume;
 595         }
 596
 597         refcount_dec(&drv_req->drv_ctx->refcnt);
 598
 599         status = be32_to_cpu(fd->status);
 600         if (unlikely(status)) {
 601                 u32 ssrc = status & JRSTA_SSRC_MASK;
 602                 u8 err_id = status & JRSTA_CCBERR_ERRID_MASK;
 603
 604                 if (ssrc != JRSTA_SSRC_CCB_ERROR ||
 605                     err_id != JRSTA_CCBERR_ERRID_ICVCHK)
 606                         dev_err_ratelimited(qidev,
 607                                             "Error: %#x in CAAM response FD\n",
 608                                             status);
 609         }
 610
 611         if (unlikely(qm_fd_get_format(fd) != qm_fd_compound)) {
 612                 dev_err(qidev, "Non-compound FD from CAAM\n");
 613                 return qman_cb_dqrr_consume;
 614         }
 615
 616         dma_unmap_single(drv_req->drv_ctx->qidev, qm_fd_addr(fd),
 617                          sizeof(drv_req->fd_sgt), DMA_BIDIRECTIONAL);
 618
 619         drv_req->cbk(drv_req, status);
 620         return qman_cb_dqrr_consume;
 621 }
 622
 623 static int alloc_rsp_fq_cpu(struct device *qidev, unsigned int cpu)
 624 {
 625         struct qm_mcc_initfq opts;
 626         struct qman_fq *fq;
 627         int ret;
 628
 629         fq = kzalloc(sizeof(*fq), GFP_KERNEL | GFP_DMA);
 630         if (!fq)
 631                 return -ENOMEM;
 632
 633         fq->cb.dqrr = caam_rsp_fq_dqrr_cb;
 634
 635         ret = qman_create_fq(0, QMAN_FQ_FLAG_NO_ENQUEUE |
 636                              QMAN_FQ_FLAG_DYNAMIC_FQID, fq);
 637         if (ret) {
 638                 dev_err(qidev, "Rsp FQ create failed\n");
 639                 kfree(fq);
 640                 return -ENODEV;
 641         }
 642
 643         memset(&opts, 0, sizeof(opts));
 644         opts.we_mask = cpu_to_be16(QM_INITFQ_WE_FQCTRL | QM_INITFQ_WE_DESTWQ |
 645                                    QM_INITFQ_WE_CONTEXTB |
 646                                    QM_INITFQ_WE_CONTEXTA | QM_INITFQ_WE_CGID);
 647         opts.fqd.fq_ctrl = cpu_to_be16(QM_FQCTRL_CTXASTASHING |
 648                                        QM_FQCTRL_CPCSTASH | QM_FQCTRL_CGE);
 649         qm_fqd_set_destwq(&opts.fqd, qman_affine_channel(cpu), 3);
 650         opts.fqd.cgid = qipriv.cgr.cgrid;
 651         opts.fqd.context_a.stashing.exclusive = QM_STASHING_EXCL_CTX |
 652                                                 QM_STASHING_EXCL_DATA;
 653         qm_fqd_set_stashing(&opts.fqd, 0, 1, 1);
 654
 655         ret = qman_init_fq(fq, QMAN_INITFQ_FLAG_SCHED, &opts);
 656         if (ret) {
 657                 dev_err(qidev, "Rsp FQ init failed\n");
 658                 kfree(fq);
 659                 return -ENODEV;
 660         }
 661
 662         per_cpu(pcpu_qipriv.rsp_fq, cpu) = fq;
 663
 664         dev_dbg(qidev, "Allocated response FQ %u for CPU %u", fq->fqid, cpu);
 665         return 0;
 666 }
 667
 668 static int init_cgr(struct device *qidev)
 669 {
 670         int ret;
 671         struct qm_mcc_initcgr opts;
 672         const u64 val = (u64)cpumask_weight(qman_affine_cpus()) *
 673                         MAX_RSP_FQ_BACKLOG_PER_CPU;
 674
 675         ret = qman_alloc_cgrid(&qipriv.cgr.cgrid);
 676         if (ret) {
 677                 dev_err(qidev, "CGR alloc failed for rsp FQs: %d\n", ret);
 678                 return ret;
 679         }
 680
 681         qipriv.cgr.cb = cgr_cb;
 682         memset(&opts, 0, sizeof(opts));
 683         opts.we_mask = cpu_to_be16(QM_CGR_WE_CSCN_EN | QM_CGR_WE_CS_THRES |
 684                                    QM_CGR_WE_MODE);
 685         opts.cgr.cscn_en = QM_CGR_EN;
 686         opts.cgr.mode = QMAN_CGR_MODE_FRAME;
 687         qm_cgr_cs_thres_set64(&opts.cgr.cs_thres, val, 1);
 688
 689         ret = qman_create_cgr(&qipriv.cgr, QMAN_CGR_FLAG_USE_INIT, &opts);
 690         if (ret) {
 691                 dev_err(qidev, "Error %d creating CAAM CGRID: %u\n", ret,
 692                         qipriv.cgr.cgrid);
 693                 return ret;
 694         }
 695
 696         dev_dbg(qidev, "Congestion threshold set to %llu\n", val);
 697         return 0;
 698 }
 699
 700 static int alloc_rsp_fqs(struct device *qidev)
 701 {
 702         int ret, i;
 703         const cpumask_t *cpus = qman_affine_cpus();
 704
 705         /*Now create response FQs*/
 706         for_each_cpu(i, cpus) {
 707                 ret = alloc_rsp_fq_cpu(qidev, i);
 708                 if (ret) {
 709                         dev_err(qidev, "CAAM rsp FQ alloc failed, cpu: %u", i);
 710                         return ret;
 711                 }
 712         }
 713
 714         return 0;
 715 }
 716
 717 static void free_rsp_fqs(void)
 718 {
 719         int i;
 720         const cpumask_t *cpus = qman_affine_cpus();
 721
 722         for_each_cpu(i, cpus)
 723                 kfree(per_cpu(pcpu_qipriv.rsp_fq, i));
 724 }
 725
 726 int caam_qi_init(struct platform_device *caam_pdev)
 727 {
 728         int err, i;
 729         struct device *ctrldev = &caam_pdev->dev, *qidev;
 730         struct caam_drv_private *ctrlpriv;
 731         const cpumask_t *cpus = qman_affine_cpus();
 732
 733         ctrlpriv = dev_get_drvdata(ctrldev);
 734         qidev = ctrldev;
 735
 736         /* Initialize the congestion detection */
 737         err = init_cgr(qidev);
 738         if (err) {
 739                 dev_err(qidev, "CGR initialization failed: %d\n", err);
 740                 return err;
 741         }
 742
 743         /* Initialise response FQs */
 744         err = alloc_rsp_fqs(qidev);
 745         if (err) {
 746                 dev_err(qidev, "Can't allocate CAAM response FQs: %d\n", err);
 747                 free_rsp_fqs();
 748                 return err;
 749         }
 750
 751         /*
 752          * Enable the NAPI contexts on each of the core which has an affine
 753          * portal.
 754          */
 755         for_each_cpu(i, cpus) {
 756                 struct caam_qi_pcpu_priv *priv = per_cpu_ptr(&pcpu_qipriv, i);
 757                 struct caam_napi *caam_napi = &priv->caam_napi;
 758                 struct napi_struct *irqtask = &caam_napi->irqtask;
 759                 struct net_device *net_dev = &priv->net_dev;
 760
 761                 net_dev->dev = *qidev;
 762                 INIT_LIST_HEAD(&net_dev->napi_list);
 763
 764                 netif_napi_add(net_dev, irqtask, caam_qi_poll,
 765                                CAAM_NAPI_WEIGHT);
 766
 767                 napi_enable(irqtask);
 768         }
 769
 770         qi_cache = kmem_cache_create("caamqicache", CAAM_QI_MEMCACHE_SIZE, 0,
 771                                      SLAB_CACHE_DMA, NULL);
 772         if (!qi_cache) {
 773                 dev_err(qidev, "Can't allocate CAAM cache\n");
 774                 free_rsp_fqs();
 775                 return -ENOMEM;
 776         }
 777
 778 #ifdef CONFIG_DEBUG_FS
 779         debugfs_create_file("qi_congested", 0444, ctrlpriv->ctl,
 780                             &times_congested, &caam_fops_u64_ro);
 781 #endif
 782
 783         err = devm_add_action_or_reset(qidev, caam_qi_shutdown, ctrlpriv);
 784         if (err)
 785                 return err;
 786
 787         dev_info(qidev, "Linux CAAM Queue I/F driver initialised\n");
 788         return 0;
 789 }