/* * Copyright (C) 2015 Etnaviv Project * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/spinlock.h> #include <linux/shmem_fs.h> #include <linux/sched/mm.h> #include <linux/sched/task.h> #include "etnaviv_drv.h" #include "etnaviv_gem.h" #include "etnaviv_gpu.h" #include "etnaviv_mmu.h" static struct lock_class_key etnaviv_shm_lock_class; static struct lock_class_key etnaviv_userptr_lock_class; static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj) { struct drm_device *dev = etnaviv_obj->base.dev; struct sg_table *sgt = etnaviv_obj->sgt; /* * For non-cached buffers, ensure the new pages are clean * because display controller, GPU, etc. are not coherent. */ if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); } static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj) { struct drm_device *dev = etnaviv_obj->base.dev; struct sg_table *sgt = etnaviv_obj->sgt; /* * For non-cached buffers, ensure the new pages are clean * because display controller, GPU, etc. are not coherent: * * WARNING: The DMA API does not support concurrent CPU * and device access to the memory area. With BIDIRECTIONAL, * we will clean the cache lines which overlap the region, * and invalidate all cache lines (partially) contained in * the region. * * If you have dirty data in the overlapping cache lines, * that will corrupt the GPU-written data. If you have * written into the remainder of the region, this can * discard those writes. */ if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); } /* called with etnaviv_obj->lock held */ static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj) { struct drm_device *dev = etnaviv_obj->base.dev; struct page **p = drm_gem_get_pages(&etnaviv_obj->base); if (IS_ERR(p)) { dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p)); return PTR_ERR(p); } etnaviv_obj->pages = p; return 0; } static void put_pages(struct etnaviv_gem_object *etnaviv_obj) { if (etnaviv_obj->sgt) { etnaviv_gem_scatterlist_unmap(etnaviv_obj); sg_free_table(etnaviv_obj->sgt); kfree(etnaviv_obj->sgt); etnaviv_obj->sgt = NULL; } if (etnaviv_obj->pages) { drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages, true, false); etnaviv_obj->pages = NULL; } } struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj) { int ret; lockdep_assert_held(&etnaviv_obj->lock); if (!etnaviv_obj->pages) { ret = etnaviv_obj->ops->get_pages(etnaviv_obj); if (ret < 0) return ERR_PTR(ret); } if (!etnaviv_obj->sgt) { struct drm_device *dev = etnaviv_obj->base.dev; int npages = etnaviv_obj->base.size >> PAGE_SHIFT; struct sg_table *sgt; sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages); if (IS_ERR(sgt)) { dev_err(dev->dev, "failed to allocate sgt: %ld\n", PTR_ERR(sgt)); return ERR_CAST(sgt); } etnaviv_obj->sgt = sgt; etnaviv_gem_scatter_map(etnaviv_obj); } return etnaviv_obj->pages; } void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj) { lockdep_assert_held(&etnaviv_obj->lock); /* when we start tracking the pin count, then do something here */ } static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, struct vm_area_struct *vma) { pgprot_t vm_page_prot; vma->vm_flags &= ~VM_PFNMAP; vma->vm_flags |= VM_MIXEDMAP; vm_page_prot = vm_get_page_prot(vma->vm_flags); if (etnaviv_obj->flags & ETNA_BO_WC) { vma->vm_page_prot = pgprot_writecombine(vm_page_prot); } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) { vma->vm_page_prot = pgprot_noncached(vm_page_prot); } else { /* * Shunt off cached objs to shmem file so they have their own * address_space (so unmap_mapping_range does what we want, * in particular in the case of mmap'd dmabufs) */ fput(vma->vm_file); get_file(etnaviv_obj->base.filp); vma->vm_pgoff = 0; vma->vm_file = etnaviv_obj->base.filp; vma->vm_page_prot = vm_page_prot; } return 0; } int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma) { struct etnaviv_gem_object *obj; int ret; ret = drm_gem_mmap(filp, vma); if (ret) { DBG("mmap failed: %d", ret); return ret; } obj = to_etnaviv_bo(vma->vm_private_data); return obj->ops->mmap(obj, vma); } int etnaviv_gem_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct drm_gem_object *obj = vma->vm_private_data; struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); struct page **pages, *page; pgoff_t pgoff; int ret; /* * Make sure we don't parallel update on a fault, nor move or remove * something from beneath our feet. Note that vm_insert_page() is * specifically coded to take care of this, so we don't have to. */ ret = mutex_lock_interruptible(&etnaviv_obj->lock); if (ret) goto out; /* make sure we have pages attached now */ pages = etnaviv_gem_get_pages(etnaviv_obj); mutex_unlock(&etnaviv_obj->lock); if (IS_ERR(pages)) { ret = PTR_ERR(pages); goto out; } /* We don't use vmf->pgoff since that has the fake offset: */ pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT; page = pages[pgoff]; VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT); ret = vm_insert_page(vma, vmf->address, page); out: switch (ret) { case -EAGAIN: case 0: case -ERESTARTSYS: case -EINTR: case -EBUSY: /* * EBUSY is ok: this just means that another thread * already did the job. */ return VM_FAULT_NOPAGE; case -ENOMEM: return VM_FAULT_OOM; default: return VM_FAULT_SIGBUS; } } int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset) { int ret; /* Make it mmapable */ ret = drm_gem_create_mmap_offset(obj); if (ret) dev_err(obj->dev->dev, "could not allocate mmap offset\n"); else *offset = drm_vma_node_offset_addr(&obj->vma_node); return ret; } static struct etnaviv_vram_mapping * etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj, struct etnaviv_iommu *mmu) { struct etnaviv_vram_mapping *mapping; list_for_each_entry(mapping, &obj->vram_list, obj_node) { if (mapping->mmu == mmu) return mapping; } return NULL; } void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping) { struct etnaviv_gem_object *etnaviv_obj = mapping->object; drm_gem_object_get(&etnaviv_obj->base); mutex_lock(&etnaviv_obj->lock); WARN_ON(mapping->use == 0); mapping->use += 1; mutex_unlock(&etnaviv_obj->lock); } void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping) { struct etnaviv_gem_object *etnaviv_obj = mapping->object; mutex_lock(&etnaviv_obj->lock); WARN_ON(mapping->use == 0); mapping->use -= 1; mutex_unlock(&etnaviv_obj->lock); drm_gem_object_put_unlocked(&etnaviv_obj->base); } struct etnaviv_vram_mapping *etnaviv_gem_mapping_get( struct drm_gem_object *obj, struct etnaviv_gpu *gpu) { struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); struct etnaviv_vram_mapping *mapping; struct page **pages; int ret = 0; mutex_lock(&etnaviv_obj->lock); mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu); if (mapping) { /* * Holding the object lock prevents the use count changing * beneath us. If the use count is zero, the MMU might be * reaping this object, so take the lock and re-check that * the MMU owns this mapping to close this race. */ if (mapping->use == 0) { mutex_lock(&gpu->mmu->lock); if (mapping->mmu == gpu->mmu) mapping->use += 1; else mapping = NULL; mutex_unlock(&gpu->mmu->lock); if (mapping) goto out; } else { mapping->use += 1; goto out; } } pages = etnaviv_gem_get_pages(etnaviv_obj); if (IS_ERR(pages)) { ret = PTR_ERR(pages); goto out; } /* * See if we have a reaped vram mapping we can re-use before * allocating a fresh mapping. */ mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL); if (!mapping) { mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); if (!mapping) { ret = -ENOMEM; goto out; } INIT_LIST_HEAD(&mapping->scan_node); mapping->object = etnaviv_obj; } else { list_del(&mapping->obj_node); } mapping->mmu = gpu->mmu; mapping->use = 1; ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base, mapping); if (ret < 0) kfree(mapping); else list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list); out: mutex_unlock(&etnaviv_obj->lock); if (ret) return ERR_PTR(ret); /* Take a reference on the object */ drm_gem_object_get(obj); return mapping; } void *etnaviv_gem_vmap(struct drm_gem_object *obj) { struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); if (etnaviv_obj->vaddr) return etnaviv_obj->vaddr; mutex_lock(&etnaviv_obj->lock); /* * Need to check again, as we might have raced with another thread * while waiting for the mutex. */ if (!etnaviv_obj->vaddr) etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj); mutex_unlock(&etnaviv_obj->lock); return etnaviv_obj->vaddr; } static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj) { struct page **pages; lockdep_assert_held(&obj->lock); pages = etnaviv_gem_get_pages(obj); if (IS_ERR(pages)) return NULL; return vmap(pages, obj->base.size >> PAGE_SHIFT, VM_MAP, pgprot_writecombine(PAGE_KERNEL)); } static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op) { if (op & ETNA_PREP_READ) return DMA_FROM_DEVICE; else if (op & ETNA_PREP_WRITE) return DMA_TO_DEVICE; else return DMA_BIDIRECTIONAL; } int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op, struct timespec *timeout) { struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); struct drm_device *dev = obj->dev; bool write = !!(op & ETNA_PREP_WRITE); int ret; if (!etnaviv_obj->sgt) { void *ret; mutex_lock(&etnaviv_obj->lock); ret = etnaviv_gem_get_pages(etnaviv_obj); mutex_unlock(&etnaviv_obj->lock); if (IS_ERR(ret)) return PTR_ERR(ret); } if (op & ETNA_PREP_NOSYNC) { if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv, write)) return -EBUSY; } else { unsigned long remain = etnaviv_timeout_to_jiffies(timeout); ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv, write, true, remain); if (ret <= 0) return ret == 0 ? -ETIMEDOUT : ret; } if (etnaviv_obj->flags & ETNA_BO_CACHED) { dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl, etnaviv_obj->sgt->nents, etnaviv_op_to_dma_dir(op)); etnaviv_obj->last_cpu_prep_op = op; } return 0; } int etnaviv_gem_cpu_fini(struct drm_gem_object *obj) { struct drm_device *dev = obj->dev; struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); if (etnaviv_obj->flags & ETNA_BO_CACHED) { /* fini without a prep is almost certainly a userspace error */ WARN_ON(etnaviv_obj->last_cpu_prep_op == 0); dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl, etnaviv_obj->sgt->nents, etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op)); etnaviv_obj->last_cpu_prep_op = 0; } return 0; } int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj, struct timespec *timeout) { struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout); } #ifdef CONFIG_DEBUG_FS static void etnaviv_gem_describe_fence(struct dma_fence *fence, const char *type, struct seq_file *m) { if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) seq_printf(m, "\t%9s: %s %s seq %u\n", type, fence->ops->get_driver_name(fence), fence->ops->get_timeline_name(fence), fence->seqno); } static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m) { struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); struct reservation_object *robj = etnaviv_obj->resv; struct reservation_object_list *fobj; struct dma_fence *fence; unsigned long off = drm_vma_node_start(&obj->vma_node); seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n", etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I', obj->name, kref_read(&obj->refcount), off, etnaviv_obj->vaddr, obj->size); rcu_read_lock(); fobj = rcu_dereference(robj->fence); if (fobj) { unsigned int i, shared_count = fobj->shared_count; for (i = 0; i < shared_count; i++) { fence = rcu_dereference(fobj->shared[i]); etnaviv_gem_describe_fence(fence, "Shared", m); } } fence = rcu_dereference(robj->fence_excl); if (fence) etnaviv_gem_describe_fence(fence, "Exclusive", m); rcu_read_unlock(); } void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv, struct seq_file *m) { struct etnaviv_gem_object *etnaviv_obj; int count = 0; size_t size = 0; mutex_lock(&priv->gem_lock); list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) { struct drm_gem_object *obj = &etnaviv_obj->base; seq_puts(m, " "); etnaviv_gem_describe(obj, m); count++; size += obj->size; } mutex_unlock(&priv->gem_lock); seq_printf(m, "Total %d objects, %zu bytes\n", count, size); } #endif static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj) { vunmap(etnaviv_obj->vaddr); put_pages(etnaviv_obj); } static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = { .get_pages = etnaviv_gem_shmem_get_pages, .release = etnaviv_gem_shmem_release, .vmap = etnaviv_gem_vmap_impl, .mmap = etnaviv_gem_mmap_obj, }; void etnaviv_gem_free_object(struct drm_gem_object *obj) { struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); struct etnaviv_drm_private *priv = obj->dev->dev_private; struct etnaviv_vram_mapping *mapping, *tmp; /* object should not be active */ WARN_ON(is_active(etnaviv_obj)); mutex_lock(&priv->gem_lock); list_del(&etnaviv_obj->gem_node); mutex_unlock(&priv->gem_lock); list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list, obj_node) { struct etnaviv_iommu *mmu = mapping->mmu; WARN_ON(mapping->use); if (mmu) etnaviv_iommu_unmap_gem(mmu, mapping); list_del(&mapping->obj_node); kfree(mapping); } drm_gem_free_mmap_offset(obj); etnaviv_obj->ops->release(etnaviv_obj); if (etnaviv_obj->resv == &etnaviv_obj->_resv) reservation_object_fini(&etnaviv_obj->_resv); drm_gem_object_release(obj); kfree(etnaviv_obj); } void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj) { struct etnaviv_drm_private *priv = dev->dev_private; struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); mutex_lock(&priv->gem_lock); list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list); mutex_unlock(&priv->gem_lock); } static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags, struct reservation_object *robj, const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj) { struct etnaviv_gem_object *etnaviv_obj; unsigned sz = sizeof(*etnaviv_obj); bool valid = true; /* validate flags */ switch (flags & ETNA_BO_CACHE_MASK) { case ETNA_BO_UNCACHED: case ETNA_BO_CACHED: case ETNA_BO_WC: break; default: valid = false; } if (!valid) { dev_err(dev->dev, "invalid cache flag: %x\n", (flags & ETNA_BO_CACHE_MASK)); return -EINVAL; } etnaviv_obj = kzalloc(sz, GFP_KERNEL); if (!etnaviv_obj) return -ENOMEM; etnaviv_obj->flags = flags; etnaviv_obj->ops = ops; if (robj) { etnaviv_obj->resv = robj; } else { etnaviv_obj->resv = &etnaviv_obj->_resv; reservation_object_init(&etnaviv_obj->_resv); } mutex_init(&etnaviv_obj->lock); INIT_LIST_HEAD(&etnaviv_obj->vram_list); *obj = &etnaviv_obj->base; return 0; } /* convenience method to construct a GEM buffer object, and userspace handle */ int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file, u32 size, u32 flags, u32 *handle) { struct drm_gem_object *obj = NULL; int ret; size = PAGE_ALIGN(size); ret = etnaviv_gem_new_impl(dev, size, flags, NULL, &etnaviv_gem_shmem_ops, &obj); if (ret) goto fail; lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class); ret = drm_gem_object_init(dev, obj, size); if (ret == 0) { struct address_space *mapping; /* * Our buffers are kept pinned, so allocating them * from the MOVABLE zone is a really bad idea, and * conflicts with CMA. See comments above new_inode() * why this is required _and_ expected if you're * going to pin these pages. */ mapping = obj->filp->f_mapping; mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); } if (ret) goto fail; etnaviv_gem_obj_add(dev, obj); ret = drm_gem_handle_create(file, obj, handle); /* drop reference from allocate - handle holds it now */ fail: drm_gem_object_put_unlocked(obj); return ret; } int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags, struct reservation_object *robj, const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res) { struct drm_gem_object *obj; int ret; ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj); if (ret) return ret; drm_gem_private_object_init(dev, obj, size); *res = to_etnaviv_bo(obj); return 0; } static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj) { struct page **pvec = NULL; struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr; int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT; might_lock_read(¤t->mm->mmap_sem); if (userptr->mm != current->mm) return -EPERM; pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); if (!pvec) return -ENOMEM; do { unsigned num_pages = npages - pinned; uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE; struct page **pages = pvec + pinned; ret = get_user_pages_fast(ptr, num_pages, !userptr->ro ? FOLL_WRITE : 0, pages); if (ret < 0) { release_pages(pvec, pinned); kvfree(pvec); return ret; } pinned += ret; } while (pinned < npages); etnaviv_obj->pages = pvec; return 0; } static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj) { if (etnaviv_obj->sgt) { etnaviv_gem_scatterlist_unmap(etnaviv_obj); sg_free_table(etnaviv_obj->sgt); kfree(etnaviv_obj->sgt); } if (etnaviv_obj->pages) { int npages = etnaviv_obj->base.size >> PAGE_SHIFT; release_pages(etnaviv_obj->pages, npages); kvfree(etnaviv_obj->pages); } } static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, struct vm_area_struct *vma) { return -EINVAL; } static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = { .get_pages = etnaviv_gem_userptr_get_pages, .release = etnaviv_gem_userptr_release, .vmap = etnaviv_gem_vmap_impl, .mmap = etnaviv_gem_userptr_mmap_obj, }; int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file, uintptr_t ptr, u32 size, u32 flags, u32 *handle) { struct etnaviv_gem_object *etnaviv_obj; int ret; ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL, &etnaviv_gem_userptr_ops, &etnaviv_obj); if (ret) return ret; lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class); etnaviv_obj->userptr.ptr = ptr; etnaviv_obj->userptr.mm = current->mm; etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE); etnaviv_gem_obj_add(dev, &etnaviv_obj->base); ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle); /* drop reference from allocate - handle holds it now */ drm_gem_object_put_unlocked(&etnaviv_obj->base); return ret; }