LXR linux/drivers/gpu/drm/etnaviv/etnaviv

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2015-2018 Etnaviv Project
   4 */
   5
   6#include <linux/dma-mapping.h>
   7#include <linux/scatterlist.h>
   8
   9#include "common.xml.h"
  10#include "etnaviv_cmdbuf.h"
  11#include "etnaviv_drv.h"
  12#include "etnaviv_gem.h"
  13#include "etnaviv_gpu.h"
  14#include "etnaviv_mmu.h"
  15
  16static void etnaviv_context_unmap(struct etnaviv_iommu_context *context,
  17                                 unsigned long iova, size_t size)
  18{
  19        size_t unmapped_page, unmapped = 0;
  20        size_t pgsize = SZ_4K;
  21
  22        if (!IS_ALIGNED(iova | size, pgsize)) {
  23                pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n",
  24                       iova, size, pgsize);
  25                return;
  26        }
  27
  28        while (unmapped < size) {
  29                unmapped_page = context->global->ops->unmap(context, iova,
  30                                                            pgsize);
  31                if (!unmapped_page)
  32                        break;
  33
  34                iova += unmapped_page;
  35                unmapped += unmapped_page;
  36        }
  37}
  38
  39static int etnaviv_context_map(struct etnaviv_iommu_context *context,
  40                              unsigned long iova, phys_addr_t paddr,
  41                              size_t size, int prot)
  42{
  43        unsigned long orig_iova = iova;
  44        size_t pgsize = SZ_4K;
  45        size_t orig_size = size;
  46        int ret = 0;
  47
  48        if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
  49                pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n",
  50                       iova, &paddr, size, pgsize);
  51                return -EINVAL;
  52        }
  53
  54        while (size) {
  55                ret = context->global->ops->map(context, iova, paddr, pgsize,
  56                                                prot);
  57                if (ret)
  58                        break;
  59
  60                iova += pgsize;
  61                paddr += pgsize;
  62                size -= pgsize;
  63        }
  64
  65        /* unroll mapping in case something went wrong */
  66        if (ret)
  67                etnaviv_context_unmap(context, orig_iova, orig_size - size);
  68
  69        return ret;
  70}
  71
  72static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova,
  73                             struct sg_table *sgt, unsigned len, int prot)
  74{       struct scatterlist *sg;
  75        unsigned int da = iova;
  76        unsigned int i;
  77        int ret;
  78
  79        if (!context || !sgt)
  80                return -EINVAL;
  81
  82        for_each_sgtable_dma_sg(sgt, sg, i) {
  83                u32 pa = sg_dma_address(sg) - sg->offset;
  84                size_t bytes = sg_dma_len(sg) + sg->offset;
  85
  86                VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
  87
  88                ret = etnaviv_context_map(context, da, pa, bytes, prot);
  89                if (ret)
  90                        goto fail;
  91
  92                da += bytes;
  93        }
  94
  95        return 0;
  96
  97fail:
  98        etnaviv_context_unmap(context, iova, da - iova);
  99        return ret;
 100}
 101
 102static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32 iova,
 103                                struct sg_table *sgt, unsigned len)
 104{
 105        struct scatterlist *sg;
 106        unsigned int da = iova;
 107        int i;
 108
 109        for_each_sgtable_dma_sg(sgt, sg, i) {
 110                size_t bytes = sg_dma_len(sg) + sg->offset;
 111
 112                etnaviv_context_unmap(context, da, bytes);
 113
 114                VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
 115
 116                BUG_ON(!PAGE_ALIGNED(bytes));
 117
 118                da += bytes;
 119        }
 120}
 121
 122static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu_context *context,
 123        struct etnaviv_vram_mapping *mapping)
 124{
 125        struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 126
 127        lockdep_assert_held(&context->lock);
 128
 129        etnaviv_iommu_unmap(context, mapping->vram_node.start,
 130                            etnaviv_obj->sgt, etnaviv_obj->base.size);
 131        drm_mm_remove_node(&mapping->vram_node);
 132}
 133
 134static int etnaviv_iommu_find_iova(struct etnaviv_iommu_context *context,
 135                                   struct drm_mm_node *node, size_t size)
 136{
 137        struct etnaviv_vram_mapping *free = NULL;
 138        enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
 139        int ret;
 140
 141        lockdep_assert_held(&context->lock);
 142
 143        while (1) {
 144                struct etnaviv_vram_mapping *m, *n;
 145                struct drm_mm_scan scan;
 146                struct list_head list;
 147                bool found;
 148
 149                ret = drm_mm_insert_node_in_range(&context->mm, node,
 150                                                  size, 0, 0, 0, U64_MAX, mode);
 151                if (ret != -ENOSPC)
 152                        break;
 153
 154                /* Try to retire some entries */
 155                drm_mm_scan_init(&scan, &context->mm, size, 0, 0, mode);
 156
 157                found = 0;
 158                INIT_LIST_HEAD(&list);
 159                list_for_each_entry(free, &context->mappings, mmu_node) {
 160                        /* If this vram node has not been used, skip this. */
 161                        if (!free->vram_node.mm)
 162                                continue;
 163
 164                        /*
 165                         * If the iova is pinned, then it's in-use,
 166                         * so we must keep its mapping.
 167                         */
 168                        if (free->use)
 169                                continue;
 170
 171                        list_add(&free->scan_node, &list);
 172                        if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
 173                                found = true;
 174                                break;
 175                        }
 176                }
 177
 178                if (!found) {
 179                        /* Nothing found, clean up and fail */
 180                        list_for_each_entry_safe(m, n, &list, scan_node)
 181                                BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
 182                        break;
 183                }
 184
 185                /*
 186                 * drm_mm does not allow any other operations while
 187                 * scanning, so we have to remove all blocks first.
 188                 * If drm_mm_scan_remove_block() returns false, we
 189                 * can leave the block pinned.
 190                 */
 191                list_for_each_entry_safe(m, n, &list, scan_node)
 192                        if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
 193                                list_del_init(&m->scan_node);
 194
 195                /*
 196                 * Unmap the blocks which need to be reaped from the MMU.
 197                 * Clear the mmu pointer to prevent the mapping_get finding
 198                 * this mapping.
 199                 */
 200                list_for_each_entry_safe(m, n, &list, scan_node) {
 201                        etnaviv_iommu_remove_mapping(context, m);
 202                        etnaviv_iommu_context_put(m->context);
 203                        m->context = NULL;
 204                        list_del_init(&m->mmu_node);
 205                        list_del_init(&m->scan_node);
 206                }
 207
 208                mode = DRM_MM_INSERT_EVICT;
 209
 210                /*
 211                 * We removed enough mappings so that the new allocation will
 212                 * succeed, retry the allocation one more time.
 213                 */
 214        }
 215
 216        return ret;
 217}
 218
 219static int etnaviv_iommu_insert_exact(struct etnaviv_iommu_context *context,
 220                   struct drm_mm_node *node, size_t size, u64 va)
 221{
 222        lockdep_assert_held(&context->lock);
 223
 224        return drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va,
 225                                           va + size, DRM_MM_INSERT_LOWEST);
 226}
 227
 228int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context,
 229        struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
 230        struct etnaviv_vram_mapping *mapping, u64 va)
 231{
 232        struct sg_table *sgt = etnaviv_obj->sgt;
 233        struct drm_mm_node *node;
 234        int ret;
 235
 236        lockdep_assert_held(&etnaviv_obj->lock);
 237
 238        mutex_lock(&context->lock);
 239
 240        /* v1 MMU can optimize single entry (contiguous) scatterlists */
 241        if (context->global->version == ETNAVIV_IOMMU_V1 &&
 242            sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
 243                u32 iova;
 244
 245                iova = sg_dma_address(sgt->sgl) - memory_base;
 246                if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
 247                        mapping->iova = iova;
 248                        list_add_tail(&mapping->mmu_node, &context->mappings);
 249                        ret = 0;
 250                        goto unlock;
 251                }
 252        }
 253
 254        node = &mapping->vram_node;
 255
 256        if (va)
 257                ret = etnaviv_iommu_insert_exact(context, node,
 258                                                 etnaviv_obj->base.size, va);
 259        else
 260                ret = etnaviv_iommu_find_iova(context, node,
 261                                              etnaviv_obj->base.size);
 262        if (ret < 0)
 263                goto unlock;
 264
 265        mapping->iova = node->start;
 266        ret = etnaviv_iommu_map(context, node->start, sgt, etnaviv_obj->base.size,
 267                                ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);
 268
 269        if (ret < 0) {
 270                drm_mm_remove_node(node);
 271                goto unlock;
 272        }
 273
 274        list_add_tail(&mapping->mmu_node, &context->mappings);
 275        context->flush_seq++;
 276unlock:
 277        mutex_unlock(&context->lock);
 278
 279        return ret;
 280}
 281
 282void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context,
 283        struct etnaviv_vram_mapping *mapping)
 284{
 285        WARN_ON(mapping->use);
 286
 287        mutex_lock(&context->lock);
 288
 289        /* If the vram node is on the mm, unmap and remove the node */
 290        if (mapping->vram_node.mm == &context->mm)
 291                etnaviv_iommu_remove_mapping(context, mapping);
 292
 293        list_del(&mapping->mmu_node);
 294        context->flush_seq++;
 295        mutex_unlock(&context->lock);
 296}
 297
 298static void etnaviv_iommu_context_free(struct kref *kref)
 299{
 300        struct etnaviv_iommu_context *context =
 301                container_of(kref, struct etnaviv_iommu_context, refcount);
 302
 303        etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping);
 304
 305        context->global->ops->free(context);
 306}
 307void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context)
 308{
 309        kref_put(&context->refcount, etnaviv_iommu_context_free);
 310}
 311
 312struct etnaviv_iommu_context *
 313etnaviv_iommu_context_init(struct etnaviv_iommu_global *global,
 314                           struct etnaviv_cmdbuf_suballoc *suballoc)
 315{
 316        struct etnaviv_iommu_context *ctx;
 317        int ret;
 318
 319        if (global->version == ETNAVIV_IOMMU_V1)
 320                ctx = etnaviv_iommuv1_context_alloc(global);
 321        else
 322                ctx = etnaviv_iommuv2_context_alloc(global);
 323
 324        if (!ctx)
 325                return NULL;
 326
 327        ret = etnaviv_cmdbuf_suballoc_map(suballoc, ctx, &ctx->cmdbuf_mapping,
 328                                          global->memory_base);
 329        if (ret)
 330                goto out_free;
 331
 332        if (global->version == ETNAVIV_IOMMU_V1 &&
 333            ctx->cmdbuf_mapping.iova > 0x80000000) {
 334                dev_err(global->dev,
 335                        "command buffer outside valid memory window\n");
 336                goto out_unmap;
 337        }
 338
 339        return ctx;
 340
 341out_unmap:
 342        etnaviv_cmdbuf_suballoc_unmap(ctx, &ctx->cmdbuf_mapping);
 343out_free:
 344        global->ops->free(ctx);
 345        return NULL;
 346}
 347
 348void etnaviv_iommu_restore(struct etnaviv_gpu *gpu,
 349                           struct etnaviv_iommu_context *context)
 350{
 351        context->global->ops->restore(gpu, context);
 352}
 353
 354int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *context,
 355                                  struct etnaviv_vram_mapping *mapping,
 356                                  u32 memory_base, dma_addr_t paddr,
 357                                  size_t size)
 358{
 359        mutex_lock(&context->lock);
 360
 361        if (mapping->use > 0) {
 362                mapping->use++;
 363                mutex_unlock(&context->lock);
 364                return 0;
 365        }
 366
 367        /*
 368         * For MMUv1 we don't add the suballoc region to the pagetables, as
 369         * those GPUs can only work with cmdbufs accessed through the linear
 370         * window. Instead we manufacture a mapping to make it look uniform
 371         * to the upper layers.
 372         */
 373        if (context->global->version == ETNAVIV_IOMMU_V1) {
 374                mapping->iova = paddr - memory_base;
 375        } else {
 376                struct drm_mm_node *node = &mapping->vram_node;
 377                int ret;
 378
 379                ret = etnaviv_iommu_find_iova(context, node, size);
 380                if (ret < 0) {
 381                        mutex_unlock(&context->lock);
 382                        return ret;
 383                }
 384
 385                mapping->iova = node->start;
 386                ret = etnaviv_context_map(context, node->start, paddr, size,
 387                                          ETNAVIV_PROT_READ);
 388                if (ret < 0) {
 389                        drm_mm_remove_node(node);
 390                        mutex_unlock(&context->lock);
 391                        return ret;
 392                }
 393
 394                context->flush_seq++;
 395        }
 396
 397        list_add_tail(&mapping->mmu_node, &context->mappings);
 398        mapping->use = 1;
 399
 400        mutex_unlock(&context->lock);
 401
 402        return 0;
 403}
 404
 405void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *context,
 406                  struct etnaviv_vram_mapping *mapping)
 407{
 408        struct drm_mm_node *node = &mapping->vram_node;
 409
 410        mutex_lock(&context->lock);
 411        mapping->use--;
 412
 413        if (mapping->use > 0 || context->global->version == ETNAVIV_IOMMU_V1) {
 414                mutex_unlock(&context->lock);
 415                return;
 416        }
 417
 418        etnaviv_context_unmap(context, node->start, node->size);
 419        drm_mm_remove_node(node);
 420        mutex_unlock(&context->lock);
 421}
 422
 423size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *context)
 424{
 425        return context->global->ops->dump_size(context);
 426}
 427
 428void etnaviv_iommu_dump(struct etnaviv_iommu_context *context, void *buf)
 429{
 430        context->global->ops->dump(context, buf);
 431}
 432
 433int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu)
 434{
 435        enum etnaviv_iommu_version version = ETNAVIV_IOMMU_V1;
 436        struct etnaviv_drm_private *priv = gpu->drm->dev_private;
 437        struct etnaviv_iommu_global *global;
 438        struct device *dev = gpu->drm->dev;
 439
 440        if (gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)
 441                version = ETNAVIV_IOMMU_V2;
 442
 443        if (priv->mmu_global) {
 444                if (priv->mmu_global->version != version) {
 445                        dev_err(gpu->dev,
 446                                "MMU version doesn't match global version\n");
 447                        return -ENXIO;
 448                }
 449
 450                priv->mmu_global->use++;
 451                return 0;
 452        }
 453
 454        global = kzalloc(sizeof(*global), GFP_KERNEL);
 455        if (!global)
 456                return -ENOMEM;
 457
 458        global->bad_page_cpu = dma_alloc_wc(dev, SZ_4K, &global->bad_page_dma,
 459                                            GFP_KERNEL);
 460        if (!global->bad_page_cpu)
 461                goto free_global;
 462
 463        memset32(global->bad_page_cpu, 0xdead55aa, SZ_4K / sizeof(u32));
 464
 465        if (version == ETNAVIV_IOMMU_V2) {
 466                global->v2.pta_cpu = dma_alloc_wc(dev, ETNAVIV_PTA_SIZE,
 467                                               &global->v2.pta_dma, GFP_KERNEL);
 468                if (!global->v2.pta_cpu)
 469                        goto free_bad_page;
 470        }
 471
 472        global->dev = dev;
 473        global->version = version;
 474        global->use = 1;
 475        mutex_init(&global->lock);
 476
 477        if (version == ETNAVIV_IOMMU_V1)
 478                global->ops = &etnaviv_iommuv1_ops;
 479        else
 480                global->ops = &etnaviv_iommuv2_ops;
 481
 482        priv->mmu_global = global;
 483
 484        return 0;
 485
 486free_bad_page:
 487        dma_free_wc(dev, SZ_4K, global->bad_page_cpu, global->bad_page_dma);
 488free_global:
 489        kfree(global);
 490
 491        return -ENOMEM;
 492}
 493
 494void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu)
 495{
 496        struct etnaviv_drm_private *priv = gpu->drm->dev_private;
 497        struct etnaviv_iommu_global *global = priv->mmu_global;
 498
 499        if (--global->use > 0)
 500                return;
 501
 502        if (global->v2.pta_cpu)
 503                dma_free_wc(global->dev, ETNAVIV_PTA_SIZE,
 504                            global->v2.pta_cpu, global->v2.pta_dma);
 505
 506        if (global->bad_page_cpu)
 507                dma_free_wc(global->dev, SZ_4K,
 508                            global->bad_page_cpu, global->bad_page_dma);
 509
 510        mutex_destroy(&global->lock);
 511        kfree(global);
 512
 513        priv->mmu_global = NULL;
 514}
 515