static int binder_update_page_range(struct binder_alloc *alloc, int allocate, void *start, void *end) { void *page_addr; unsigned long user_page_addr; struct binder_lru_page *page; struct vm_area_struct *vma = NULL; struct mm_struct *mm = NULL; bool need_mm = false; binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC, "%d: %s pages %pK-%pK\n", alloc->pid, allocate ? "allocate" : "free", start, end); if (end <= start) return 0; trace_binder_update_page_range(alloc, allocate, start, end); if (allocate == 0) goto free_range; for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) { page = &alloc->pages[(page_addr - alloc->buffer) / PAGE_SIZE]; if (!page->page_ptr) { need_mm = true; break; } } if (need_mm && mmget_not_zero(alloc->vma_vm_mm)) mm = alloc->vma_vm_mm; if (mm) { down_read(&mm->mmap_sem); vma = alloc->vma; } if (!vma && need_mm) { pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n", alloc->pid); goto err_no_vma; } for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) { int ret; bool on_lru; size_t index; index = (page_addr - alloc->buffer) / PAGE_SIZE; page = &alloc->pages[index]; if (page->page_ptr) { trace_binder_alloc_lru_start(alloc, index); on_lru = list_lru_del(&binder_alloc_lru, &page->lru); WARN_ON(!on_lru); trace_binder_alloc_lru_end(alloc, index); continue; } if (WARN_ON(!vma)) goto err_page_ptr_cleared; trace_binder_alloc_page_start(alloc, index); page->page_ptr = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO); if (!page->page_ptr) { pr_err("%d: binder_alloc_buf failed for page at %pK\n", alloc->pid, page_addr); goto err_alloc_page_failed; } page->alloc = alloc; INIT_LIST_HEAD(&page->lru); ret = map_kernel_range_noflush((unsigned long)page_addr, PAGE_SIZE, PAGE_KERNEL, &page->page_ptr); flush_cache_vmap((unsigned long)page_addr, (unsigned long)page_addr + PAGE_SIZE); if (ret != 1) { pr_err("%d: binder_alloc_buf failed to map page at %pK in kernel\n", alloc->pid, page_addr); goto err_map_kernel_failed; } user_page_addr = (uintptr_t)page_addr + alloc->user_buffer_offset; ret = vm_insert_page(vma, user_page_addr, page[0].page_ptr); if (ret) { pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n", alloc->pid, user_page_addr); goto err_vm_insert_page_failed; } if (index + 1 > alloc->pages_high) alloc->pages_high = index + 1; trace_binder_alloc_page_end(alloc, index); /* vm_insert_page does not seem to increment the refcount */ } if (mm) { up_read(&mm->mmap_sem); mmput(mm); } return 0; free_range: for (page_addr = end - PAGE_SIZE; page_addr >= start; page_addr -= PAGE_SIZE) { bool ret; size_t index; index = (page_addr - alloc->buffer) / PAGE_SIZE; page = &alloc->pages[index]; trace_binder_free_lru_start(alloc, index); ret = list_lru_add(&binder_alloc_lru, &page->lru); WARN_ON(!ret); trace_binder_free_lru_end(alloc, index); continue; err_vm_insert_page_failed: unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE); err_map_kernel_failed: __free_page(page->page_ptr); page->page_ptr = NULL; err_alloc_page_failed: err_page_ptr_cleared: ; } err_no_vma: if (mm) { up_read(&mm->mmap_sem); mmput(mm); } return vma ? -ENOMEM : -ESRCH; }
static void __i915_gem_userptr_get_pages_worker(struct work_struct *_work) { struct get_pages_work *work = container_of(_work, typeof(*work), work); struct drm_i915_gem_object *obj = work->obj; const int npages = obj->base.size >> PAGE_SHIFT; struct page **pvec; int pinned, ret; ret = -ENOMEM; pinned = 0; pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); if (pvec != NULL) { struct mm_struct *mm = obj->userptr.mm->mm; unsigned int flags = 0; if (!i915_gem_object_is_readonly(obj)) flags |= FOLL_WRITE; ret = -EFAULT; if (mmget_not_zero(mm)) { down_read(&mm->mmap_sem); while (pinned < npages) { ret = get_user_pages_remote (work->task, mm, obj->userptr.ptr + pinned * PAGE_SIZE, npages - pinned, flags, pvec + pinned, NULL, NULL); if (ret < 0) break; pinned += ret; } up_read(&mm->mmap_sem); mmput(mm); } } mutex_lock(&obj->mm.lock); if (obj->userptr.work == &work->work) { struct sg_table *pages = ERR_PTR(ret); if (pinned == npages) { pages = __i915_gem_userptr_alloc_pages(obj, pvec, npages); if (!IS_ERR(pages)) { pinned = 0; pages = NULL; } } obj->userptr.work = ERR_CAST(pages); if (IS_ERR(pages)) __i915_gem_userptr_set_active(obj, false); } mutex_unlock(&obj->mm.lock); release_pages(pvec, pinned); kvfree(pvec); i915_gem_object_put(obj); put_task_struct(work->task); kfree(work); }