From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 574 ++++++++++++++++++++++++++++++++++ 1 file changed, 574 insertions(+) create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_mmu.c (limited to 'drivers/gpu/drm/etnaviv/etnaviv_mmu.c') diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c new file mode 100644 index 0000000000..4fa7256718 --- /dev/null +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c @@ -0,0 +1,574 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2015-2018 Etnaviv Project + */ + +#include +#include + +#include "common.xml.h" +#include "etnaviv_cmdbuf.h" +#include "etnaviv_drv.h" +#include "etnaviv_gem.h" +#include "etnaviv_gpu.h" +#include "etnaviv_mmu.h" + +static void etnaviv_context_unmap(struct etnaviv_iommu_context *context, + unsigned long iova, size_t size) +{ + size_t unmapped_page, unmapped = 0; + size_t pgsize = SZ_4K; + + if (!IS_ALIGNED(iova | size, pgsize)) { + pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n", + iova, size, pgsize); + return; + } + + while (unmapped < size) { + unmapped_page = context->global->ops->unmap(context, iova, + pgsize); + if (!unmapped_page) + break; + + iova += unmapped_page; + unmapped += unmapped_page; + } +} + +static int etnaviv_context_map(struct etnaviv_iommu_context *context, + unsigned long iova, phys_addr_t paddr, + size_t size, int prot) +{ + unsigned long orig_iova = iova; + size_t pgsize = SZ_4K; + size_t orig_size = size; + int ret = 0; + + if (!IS_ALIGNED(iova | paddr | size, pgsize)) { + pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n", + iova, &paddr, size, pgsize); + return -EINVAL; + } + + while (size) { + ret = context->global->ops->map(context, iova, paddr, pgsize, + prot); + if (ret) + break; + + iova += pgsize; + paddr += pgsize; + size -= pgsize; + } + + /* unroll mapping in case something went wrong */ + if (ret) + etnaviv_context_unmap(context, orig_iova, orig_size - size); + + return ret; +} + +static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova, + struct sg_table *sgt, unsigned len, int prot) +{ struct scatterlist *sg; + unsigned int da = iova; + unsigned int i; + int ret; + + if (!context || !sgt) + return -EINVAL; + + for_each_sgtable_dma_sg(sgt, sg, i) { + phys_addr_t pa = sg_dma_address(sg) - sg->offset; + size_t bytes = sg_dma_len(sg) + sg->offset; + + VERB("map[%d]: %08x %pap(%zx)", i, iova, &pa, bytes); + + ret = etnaviv_context_map(context, da, pa, bytes, prot); + if (ret) + goto fail; + + da += bytes; + } + + context->flush_seq++; + + return 0; + +fail: + etnaviv_context_unmap(context, iova, da - iova); + return ret; +} + +static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32 iova, + struct sg_table *sgt, unsigned len) +{ + struct scatterlist *sg; + unsigned int da = iova; + int i; + + for_each_sgtable_dma_sg(sgt, sg, i) { + size_t bytes = sg_dma_len(sg) + sg->offset; + + etnaviv_context_unmap(context, da, bytes); + + VERB("unmap[%d]: %08x(%zx)", i, iova, bytes); + + BUG_ON(!PAGE_ALIGNED(bytes)); + + da += bytes; + } + + context->flush_seq++; +} + +static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu_context *context, + struct etnaviv_vram_mapping *mapping) +{ + struct etnaviv_gem_object *etnaviv_obj = mapping->object; + + lockdep_assert_held(&context->lock); + + etnaviv_iommu_unmap(context, mapping->vram_node.start, + etnaviv_obj->sgt, etnaviv_obj->base.size); + drm_mm_remove_node(&mapping->vram_node); +} + +void etnaviv_iommu_reap_mapping(struct etnaviv_vram_mapping *mapping) +{ + struct etnaviv_iommu_context *context = mapping->context; + + lockdep_assert_held(&context->lock); + WARN_ON(mapping->use); + + etnaviv_iommu_remove_mapping(context, mapping); + etnaviv_iommu_context_put(mapping->context); + mapping->context = NULL; + list_del_init(&mapping->mmu_node); +} + +static int etnaviv_iommu_find_iova(struct etnaviv_iommu_context *context, + struct drm_mm_node *node, size_t size) +{ + struct etnaviv_vram_mapping *free = NULL; + enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW; + int ret; + + lockdep_assert_held(&context->lock); + + while (1) { + struct etnaviv_vram_mapping *m, *n; + struct drm_mm_scan scan; + struct list_head list; + bool found; + + ret = drm_mm_insert_node_in_range(&context->mm, node, + size, 0, 0, 0, U64_MAX, mode); + if (ret != -ENOSPC) + break; + + /* Try to retire some entries */ + drm_mm_scan_init(&scan, &context->mm, size, 0, 0, mode); + + found = 0; + INIT_LIST_HEAD(&list); + list_for_each_entry(free, &context->mappings, mmu_node) { + /* If this vram node has not been used, skip this. */ + if (!free->vram_node.mm) + continue; + + /* + * If the iova is pinned, then it's in-use, + * so we must keep its mapping. + */ + if (free->use) + continue; + + list_add(&free->scan_node, &list); + if (drm_mm_scan_add_block(&scan, &free->vram_node)) { + found = true; + break; + } + } + + if (!found) { + /* Nothing found, clean up and fail */ + list_for_each_entry_safe(m, n, &list, scan_node) + BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node)); + break; + } + + /* + * drm_mm does not allow any other operations while + * scanning, so we have to remove all blocks first. + * If drm_mm_scan_remove_block() returns false, we + * can leave the block pinned. + */ + list_for_each_entry_safe(m, n, &list, scan_node) + if (!drm_mm_scan_remove_block(&scan, &m->vram_node)) + list_del_init(&m->scan_node); + + /* + * Unmap the blocks which need to be reaped from the MMU. + * Clear the mmu pointer to prevent the mapping_get finding + * this mapping. + */ + list_for_each_entry_safe(m, n, &list, scan_node) { + etnaviv_iommu_reap_mapping(m); + list_del_init(&m->scan_node); + } + + mode = DRM_MM_INSERT_EVICT; + + /* + * We removed enough mappings so that the new allocation will + * succeed, retry the allocation one more time. + */ + } + + return ret; +} + +static int etnaviv_iommu_insert_exact(struct etnaviv_iommu_context *context, + struct drm_mm_node *node, size_t size, u64 va) +{ + struct etnaviv_vram_mapping *m, *n; + struct drm_mm_node *scan_node; + LIST_HEAD(scan_list); + int ret; + + lockdep_assert_held(&context->lock); + + ret = drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va, + va + size, DRM_MM_INSERT_LOWEST); + if (ret != -ENOSPC) + return ret; + + /* + * When we can't insert the node, due to a existing mapping blocking + * the address space, there are two possible reasons: + * 1. Userspace genuinely messed up and tried to reuse address space + * before the last job using this VMA has finished executing. + * 2. The existing buffer mappings are idle, but the buffers are not + * destroyed yet (likely due to being referenced by another context) in + * which case the mappings will not be cleaned up and we must reap them + * here to make space for the new mapping. + */ + + drm_mm_for_each_node_in_range(scan_node, &context->mm, va, va + size) { + m = container_of(scan_node, struct etnaviv_vram_mapping, + vram_node); + + if (m->use) + return -ENOSPC; + + list_add(&m->scan_node, &scan_list); + } + + list_for_each_entry_safe(m, n, &scan_list, scan_node) { + etnaviv_iommu_reap_mapping(m); + list_del_init(&m->scan_node); + } + + return drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va, + va + size, DRM_MM_INSERT_LOWEST); +} + +int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context, + struct etnaviv_gem_object *etnaviv_obj, u32 memory_base, + struct etnaviv_vram_mapping *mapping, u64 va) +{ + struct sg_table *sgt = etnaviv_obj->sgt; + struct drm_mm_node *node; + int ret; + + lockdep_assert_held(&etnaviv_obj->lock); + + mutex_lock(&context->lock); + + /* v1 MMU can optimize single entry (contiguous) scatterlists */ + if (context->global->version == ETNAVIV_IOMMU_V1 && + sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) { + u32 iova; + + iova = sg_dma_address(sgt->sgl) - memory_base; + if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) { + mapping->iova = iova; + mapping->context = etnaviv_iommu_context_get(context); + list_add_tail(&mapping->mmu_node, &context->mappings); + ret = 0; + goto unlock; + } + } + + node = &mapping->vram_node; + + if (va) + ret = etnaviv_iommu_insert_exact(context, node, + etnaviv_obj->base.size, va); + else + ret = etnaviv_iommu_find_iova(context, node, + etnaviv_obj->base.size); + if (ret < 0) + goto unlock; + + mapping->iova = node->start; + ret = etnaviv_iommu_map(context, node->start, sgt, etnaviv_obj->base.size, + ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE); + + if (ret < 0) { + drm_mm_remove_node(node); + goto unlock; + } + + mapping->context = etnaviv_iommu_context_get(context); + list_add_tail(&mapping->mmu_node, &context->mappings); +unlock: + mutex_unlock(&context->lock); + + return ret; +} + +void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context, + struct etnaviv_vram_mapping *mapping) +{ + WARN_ON(mapping->use); + + mutex_lock(&context->lock); + + /* Bail if the mapping has been reaped by another thread */ + if (!mapping->context) { + mutex_unlock(&context->lock); + return; + } + + /* If the vram node is on the mm, unmap and remove the node */ + if (mapping->vram_node.mm == &context->mm) + etnaviv_iommu_remove_mapping(context, mapping); + + list_del(&mapping->mmu_node); + mutex_unlock(&context->lock); + etnaviv_iommu_context_put(context); +} + +static void etnaviv_iommu_context_free(struct kref *kref) +{ + struct etnaviv_iommu_context *context = + container_of(kref, struct etnaviv_iommu_context, refcount); + + etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping); + + context->global->ops->free(context); +} +void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context) +{ + kref_put(&context->refcount, etnaviv_iommu_context_free); +} + +struct etnaviv_iommu_context * +etnaviv_iommu_context_init(struct etnaviv_iommu_global *global, + struct etnaviv_cmdbuf_suballoc *suballoc) +{ + struct etnaviv_iommu_context *ctx; + int ret; + + if (global->version == ETNAVIV_IOMMU_V1) + ctx = etnaviv_iommuv1_context_alloc(global); + else + ctx = etnaviv_iommuv2_context_alloc(global); + + if (!ctx) + return NULL; + + ret = etnaviv_cmdbuf_suballoc_map(suballoc, ctx, &ctx->cmdbuf_mapping, + global->memory_base); + if (ret) + goto out_free; + + if (global->version == ETNAVIV_IOMMU_V1 && + ctx->cmdbuf_mapping.iova > 0x80000000) { + dev_err(global->dev, + "command buffer outside valid memory window\n"); + goto out_unmap; + } + + return ctx; + +out_unmap: + etnaviv_cmdbuf_suballoc_unmap(ctx, &ctx->cmdbuf_mapping); +out_free: + global->ops->free(ctx); + return NULL; +} + +void etnaviv_iommu_restore(struct etnaviv_gpu *gpu, + struct etnaviv_iommu_context *context) +{ + context->global->ops->restore(gpu, context); +} + +int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *context, + struct etnaviv_vram_mapping *mapping, + u32 memory_base, dma_addr_t paddr, + size_t size) +{ + mutex_lock(&context->lock); + + if (mapping->use > 0) { + mapping->use++; + mutex_unlock(&context->lock); + return 0; + } + + /* + * For MMUv1 we don't add the suballoc region to the pagetables, as + * those GPUs can only work with cmdbufs accessed through the linear + * window. Instead we manufacture a mapping to make it look uniform + * to the upper layers. + */ + if (context->global->version == ETNAVIV_IOMMU_V1) { + mapping->iova = paddr - memory_base; + } else { + struct drm_mm_node *node = &mapping->vram_node; + int ret; + + ret = etnaviv_iommu_find_iova(context, node, size); + if (ret < 0) { + mutex_unlock(&context->lock); + return ret; + } + + mapping->iova = node->start; + ret = etnaviv_context_map(context, node->start, paddr, size, + ETNAVIV_PROT_READ); + if (ret < 0) { + drm_mm_remove_node(node); + mutex_unlock(&context->lock); + return ret; + } + + context->flush_seq++; + } + + list_add_tail(&mapping->mmu_node, &context->mappings); + mapping->use = 1; + + mutex_unlock(&context->lock); + + return 0; +} + +void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *context, + struct etnaviv_vram_mapping *mapping) +{ + struct drm_mm_node *node = &mapping->vram_node; + + mutex_lock(&context->lock); + mapping->use--; + + if (mapping->use > 0 || context->global->version == ETNAVIV_IOMMU_V1) { + mutex_unlock(&context->lock); + return; + } + + etnaviv_context_unmap(context, node->start, node->size); + drm_mm_remove_node(node); + mutex_unlock(&context->lock); +} + +size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *context) +{ + return context->global->ops->dump_size(context); +} + +void etnaviv_iommu_dump(struct etnaviv_iommu_context *context, void *buf) +{ + context->global->ops->dump(context, buf); +} + +int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu) +{ + enum etnaviv_iommu_version version = ETNAVIV_IOMMU_V1; + struct etnaviv_drm_private *priv = gpu->drm->dev_private; + struct etnaviv_iommu_global *global; + struct device *dev = gpu->drm->dev; + + if (gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION) + version = ETNAVIV_IOMMU_V2; + + if (priv->mmu_global) { + if (priv->mmu_global->version != version) { + dev_err(gpu->dev, + "MMU version doesn't match global version\n"); + return -ENXIO; + } + + priv->mmu_global->use++; + return 0; + } + + global = kzalloc(sizeof(*global), GFP_KERNEL); + if (!global) + return -ENOMEM; + + global->bad_page_cpu = dma_alloc_wc(dev, SZ_4K, &global->bad_page_dma, + GFP_KERNEL); + if (!global->bad_page_cpu) + goto free_global; + + memset32(global->bad_page_cpu, 0xdead55aa, SZ_4K / sizeof(u32)); + + if (version == ETNAVIV_IOMMU_V2) { + global->v2.pta_cpu = dma_alloc_wc(dev, ETNAVIV_PTA_SIZE, + &global->v2.pta_dma, GFP_KERNEL); + if (!global->v2.pta_cpu) + goto free_bad_page; + } + + global->dev = dev; + global->version = version; + global->use = 1; + mutex_init(&global->lock); + + if (version == ETNAVIV_IOMMU_V1) + global->ops = &etnaviv_iommuv1_ops; + else + global->ops = &etnaviv_iommuv2_ops; + + priv->mmu_global = global; + + return 0; + +free_bad_page: + dma_free_wc(dev, SZ_4K, global->bad_page_cpu, global->bad_page_dma); +free_global: + kfree(global); + + return -ENOMEM; +} + +void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu) +{ + struct etnaviv_drm_private *priv = gpu->drm->dev_private; + struct etnaviv_iommu_global *global = priv->mmu_global; + + if (!global) + return; + + if (--global->use > 0) + return; + + if (global->v2.pta_cpu) + dma_free_wc(global->dev, ETNAVIV_PTA_SIZE, + global->v2.pta_cpu, global->v2.pta_dma); + + if (global->bad_page_cpu) + dma_free_wc(global->dev, SZ_4K, + global->bad_page_cpu, global->bad_page_dma); + + mutex_destroy(&global->lock); + kfree(global); + + priv->mmu_global = NULL; +} -- cgit v1.2.3