From patchwork Mon Jun 24 19:49:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 11014049 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7CFD613AF for ; Mon, 24 Jun 2019 19:49:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6EE18288BD for ; Mon, 24 Jun 2019 19:49:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 62F7428A89; Mon, 24 Jun 2019 19:49:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 8C134288BD for ; Mon, 24 Jun 2019 19:49:23 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0943A89700; Mon, 24 Jun 2019 19:49:21 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-pg1-x543.google.com (mail-pg1-x543.google.com [IPv6:2607:f8b0:4864:20::543]) by gabe.freedesktop.org (Postfix) with ESMTPS id 489A489612 for ; Mon, 24 Jun 2019 19:49:19 +0000 (UTC) Received: by mail-pg1-x543.google.com with SMTP id 196so7665020pgc.6 for ; Mon, 24 Jun 2019 12:49:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ImGT/RYfIwkVeKcevhBFy+DosfaXfO541YHID3itWtM=; b=b7ai5UZgLOBe0xGXg9zrYVVCF1XTIOsNSNCjjXR0gXqjoiSMz8u4ClP5WfMzA8ozHf QpQn/KjYsBjepcSzZ8O8lcj0OXaPrDroVlXigsdtxFnVMmuHFMB6njzaIaNuS0alstNN 8oGxBmk5W42CAEcxaHUnwnfX4lvtBJLNu2w6/5hVpYpPPNEJAUzX3sd+8T8JtHWPPzIy FgKSoqliFV7WnyKJTXufDj1GCEje5PI5di3CmKFBa8o8ug5FPC+p+B7gB95CUt1lHqdb nFpIMPa801m1ZWTXR5VwFBPGFpxRyJKCHzB+Chg1KQQIZFJsYTaGH7E57oLt1IkK7hmr 38mg== X-Gm-Message-State: APjAAAUm6alpVBYdFmHf76oTHT8diTLNwX1p8X3iZHnirgKs7exHzisv 63CnCnd7rktcOKCl+IvkGqszmBXYi5s= X-Google-Smtp-Source: APXvYqzYzW2MbLf5j7s2EnV9yXdQfDtROWmXRGP5Gb7Mg6WFQoLIT7Za6gCW7O6XtPigFVvWJJlXpA== X-Received: by 2002:a17:90a:214e:: with SMTP id a72mr27617457pje.0.1561405758711; Mon, 24 Jun 2019 12:49:18 -0700 (PDT) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id v3sm7957031pfm.188.2019.06.24.12.49.16 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 24 Jun 2019 12:49:17 -0700 (PDT) From: John Stultz To: lkml Subject: [PATCH v6 2/5] dma-buf: heaps: Add heap helpers Date: Mon, 24 Jun 2019 19:49:05 +0000 Message-Id: <20190624194908.121273-3-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190624194908.121273-1-john.stultz@linaro.org> References: <20190624194908.121273-1-john.stultz@linaro.org> X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=ImGT/RYfIwkVeKcevhBFy+DosfaXfO541YHID3itWtM=; b=K2cEKL428RjFQQhy0jJ4MPXqCg1bYhJemOQGffAiTDMKcib6WNLk9yqH0b6tv2eL08 MUVzXi2qPzSyy7lWHu2BMVR/Vl+cQRManWokku18IbZPhQtzJQBeh3Kqa8ZeJ3Z6MPkB W0s7ozufT5+GutJWnNvG3Uh5fBTe3eI5wUv8oawRScSDcgRhsnsTGq6VPAknIHxu9SBa scijkqITNcudaxkRuNO9JGuAlzymR+sx9H8zJSj8kYZgJ4fmlGJQHRqtA5evVYuZlJci gGGi9SjWR/q/iGFOjB/YgaFt2YtLqlbbP35wWdW34+kvztHCS0HR0lV8WA73e72qtLuH PEAQ== X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yudongbin , Sudipto Paul , Xu YiPing , Vincent Donnefort , "Chenfeng \(puck\)" , dri-devel@lists.freedesktop.org, Chenbo Feng , Alistair Strachan , Liam Mark , Christoph Hellwig , "Xiaqing \(A\)" , "Andrew F . Davis" , Pratik Patel , butao MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Add generic helper dmabuf ops for dma heaps, so we can reduce the amount of duplicative code for the exported dmabufs. This code is an evolution of the Android ION implementation, so thanks to its original authors and maintainters: Rebecca Schultz Zavin, Colin Cross, Laura Abbott, and others! Cc: Laura Abbott Cc: Benjamin Gaignard Cc: Sumit Semwal Cc: Liam Mark Cc: Pratik Patel Cc: Brian Starkey Cc: Vincent Donnefort Cc: Sudipto Paul Cc: Andrew F. Davis Cc: Xu YiPing Cc: "Chenfeng (puck)" Cc: butao Cc: "Xiaqing (A)" Cc: Yudongbin Cc: Christoph Hellwig Cc: Chenbo Feng Cc: Alistair Strachan Cc: dri-devel@lists.freedesktop.org Reviewed-by: Benjamin Gaignard Signed-off-by: John Stultz Change-Id: I48d43656e7783f266d877e363116b5187639f996 --- v2: * Removed cache management performance hack that I had accidentally folded in. * Removed stats code that was in helpers * Lots of checkpatch cleanups v3: * Uninline INIT_HEAP_HELPER_BUFFER (suggested by Christoph) * Switch to WARN on buffer destroy failure (suggested by Brian) * buffer->kmap_cnt decrementing cleanup (suggested by Christoph) * Extra buffer->vaddr checking in dma_heap_dma_buf_kmap (suggested by Brian) * Switch to_helper_buffer from macro to inline function (suggested by Benjamin) * Rename kmap->vmap (folded in from Andrew) * Use vmap for vmapping - not begin_cpu_access (folded in from Andrew) * Drop kmap for now, as its optional (folded in from Andrew) * Fold dma_heap_map_user into the single caller (foled in from Andrew) * Folded in patch from Andrew to track page list per heap not sglist, which simplifies the tracking logic v4: * Moved dma-heap.h change out to previous patch v6: * Minor cleanups and typo fixes suggested by Brian --- drivers/dma-buf/Makefile | 1 + drivers/dma-buf/heaps/Makefile | 2 + drivers/dma-buf/heaps/heap-helpers.c | 262 +++++++++++++++++++++++++++ drivers/dma-buf/heaps/heap-helpers.h | 54 ++++++ 4 files changed, 319 insertions(+) create mode 100644 drivers/dma-buf/heaps/Makefile create mode 100644 drivers/dma-buf/heaps/heap-helpers.c create mode 100644 drivers/dma-buf/heaps/heap-helpers.h diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile index 1cb3dd104825..e3e3dca29e46 100644 --- a/drivers/dma-buf/Makefile +++ b/drivers/dma-buf/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only obj-y := dma-buf.o dma-fence.o dma-fence-array.o dma-fence-chain.o \ reservation.o seqno-fence.o +obj-$(CONFIG_DMABUF_HEAPS) += heaps/ obj-$(CONFIG_DMABUF_HEAPS) += dma-heap.o obj-$(CONFIG_SYNC_FILE) += sync_file.o obj-$(CONFIG_SW_SYNC) += sw_sync.o sync_debug.o diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile new file mode 100644 index 000000000000..de49898112db --- /dev/null +++ b/drivers/dma-buf/heaps/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-y += heap-helpers.o diff --git a/drivers/dma-buf/heaps/heap-helpers.c b/drivers/dma-buf/heaps/heap-helpers.c new file mode 100644 index 000000000000..fba1895f3bf0 --- /dev/null +++ b/drivers/dma-buf/heaps/heap-helpers.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include + +#include "heap-helpers.h" + +void INIT_HEAP_HELPER_BUFFER(struct heap_helper_buffer *buffer, + void (*free)(struct heap_helper_buffer *)) +{ + buffer->private_flags = 0; + buffer->priv_virt = NULL; + mutex_init(&buffer->lock); + buffer->vmap_cnt = 0; + buffer->vaddr = NULL; + buffer->pagecount = 0; + buffer->pages = NULL;; + INIT_LIST_HEAD(&buffer->attachments); + buffer->free = free; +} + +static void *dma_heap_map_kernel(struct heap_helper_buffer *buffer) +{ + void *vaddr; + + vaddr = vmap(buffer->pages, buffer->pagecount, VM_MAP, PAGE_KERNEL); + if (!vaddr) + return ERR_PTR(-ENOMEM); + + return vaddr; +} + +static void dma_heap_buffer_destroy(struct dma_heap_buffer *heap_buffer) +{ + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + + if (buffer->vmap_cnt > 0) { + WARN("%s: buffer still mapped in the kernel\n", + __func__); + vunmap(buffer->vaddr); + } + + buffer->free(buffer); +} + +static void *dma_heap_buffer_vmap_get(struct dma_heap_buffer *heap_buffer) +{ + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + void *vaddr; + + if (buffer->vmap_cnt) { + buffer->vmap_cnt++; + return buffer->vaddr; + } + vaddr = dma_heap_map_kernel(buffer); + if (WARN_ONCE(!vaddr, + "heap->ops->map_kernel should return ERR_PTR on error")) + return ERR_PTR(-EINVAL); + if (IS_ERR(vaddr)) + return vaddr; + buffer->vaddr = vaddr; + buffer->vmap_cnt++; + return vaddr; +} + +static void dma_heap_buffer_vmap_put(struct dma_heap_buffer *heap_buffer) +{ + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + + if (!--buffer->vmap_cnt) { + vunmap(buffer->vaddr); + buffer->vaddr = NULL; + } +} + +struct dma_heaps_attachment { + struct device *dev; + struct sg_table table; + struct list_head list; +}; + +static int dma_heap_attach(struct dma_buf *dmabuf, + struct dma_buf_attachment *attachment) +{ + struct dma_heaps_attachment *a; + struct dma_heap_buffer *heap_buffer = dmabuf->priv; + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + int ret; + + a = kzalloc(sizeof(*a), GFP_KERNEL); + if (!a) + return -ENOMEM; + + ret = sg_alloc_table_from_pages(&a->table, buffer->pages, + buffer->pagecount, 0, + buffer->pagecount << PAGE_SHIFT, + GFP_KERNEL); + if (ret) { + kfree(a); + return ret; + } + + a->dev = attachment->dev; + INIT_LIST_HEAD(&a->list); + + attachment->priv = a; + + mutex_lock(&buffer->lock); + list_add(&a->list, &buffer->attachments); + mutex_unlock(&buffer->lock); + + return 0; +} + +static void dma_heap_detach(struct dma_buf *dmabuf, + struct dma_buf_attachment *attachment) +{ + struct dma_heaps_attachment *a = attachment->priv; + struct dma_heap_buffer *heap_buffer = dmabuf->priv; + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + + mutex_lock(&buffer->lock); + list_del(&a->list); + mutex_unlock(&buffer->lock); + + sg_free_table(&a->table); + kfree(a); +} + +static struct sg_table *dma_heap_map_dma_buf( + struct dma_buf_attachment *attachment, + enum dma_data_direction direction) +{ + struct dma_heaps_attachment *a = attachment->priv; + struct sg_table *table; + + table = &a->table; + + if (!dma_map_sg(attachment->dev, table->sgl, table->nents, + direction)) + table = ERR_PTR(-ENOMEM); + return table; +} + +static void dma_heap_unmap_dma_buf(struct dma_buf_attachment *attachment, + struct sg_table *table, + enum dma_data_direction direction) +{ + dma_unmap_sg(attachment->dev, table->sgl, table->nents, direction); +} + +static vm_fault_t dma_heap_vm_fault(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct heap_helper_buffer *buffer = vma->vm_private_data; + + vmf->page = buffer->pages[vmf->pgoff]; + get_page(vmf->page); + + return 0; +} + +static const struct vm_operations_struct dma_heap_vm_ops = { + .fault = dma_heap_vm_fault, +}; + +static int dma_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) +{ + struct dma_heap_buffer *heap_buffer = dmabuf->priv; + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + + if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0) + return -EINVAL; + + vma->vm_ops = &dma_heap_vm_ops; + vma->vm_private_data = buffer; + + return 0; +} + +static void dma_heap_dma_buf_release(struct dma_buf *dmabuf) +{ + struct dma_heap_buffer *buffer = dmabuf->priv; + + dma_heap_buffer_destroy(buffer); +} + +static int dma_heap_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, + enum dma_data_direction direction) +{ + struct dma_heap_buffer *heap_buffer = dmabuf->priv; + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + struct dma_heaps_attachment *a; + int ret = 0; + + mutex_lock(&buffer->lock); + list_for_each_entry(a, &buffer->attachments, list) { + dma_sync_sg_for_cpu(a->dev, a->table.sgl, a->table.nents, + direction); + } + mutex_unlock(&buffer->lock); + + return ret; +} + +static int dma_heap_dma_buf_end_cpu_access(struct dma_buf *dmabuf, + enum dma_data_direction direction) +{ + struct dma_heap_buffer *heap_buffer = dmabuf->priv; + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + struct dma_heaps_attachment *a; + + mutex_lock(&buffer->lock); + list_for_each_entry(a, &buffer->attachments, list) { + dma_sync_sg_for_device(a->dev, a->table.sgl, a->table.nents, + direction); + } + mutex_unlock(&buffer->lock); + + return 0; +} + +static void *dma_heap_dma_buf_vmap(struct dma_buf *dmabuf) +{ + struct dma_heap_buffer *heap_buffer = dmabuf->priv; + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + void *vaddr; + + mutex_lock(&buffer->lock); + vaddr = dma_heap_buffer_vmap_get(heap_buffer); + mutex_unlock(&buffer->lock); + + return vaddr; +} + +static void dma_heap_dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) +{ + struct dma_heap_buffer *heap_buffer = dmabuf->priv; + struct heap_helper_buffer *buffer = to_helper_buffer(heap_buffer); + + mutex_lock(&buffer->lock); + dma_heap_buffer_vmap_put(heap_buffer); + mutex_unlock(&buffer->lock); +} + +const struct dma_buf_ops heap_helper_ops = { + .map_dma_buf = dma_heap_map_dma_buf, + .unmap_dma_buf = dma_heap_unmap_dma_buf, + .mmap = dma_heap_mmap, + .release = dma_heap_dma_buf_release, + .attach = dma_heap_attach, + .detach = dma_heap_detach, + .begin_cpu_access = dma_heap_dma_buf_begin_cpu_access, + .end_cpu_access = dma_heap_dma_buf_end_cpu_access, + .vmap = dma_heap_dma_buf_vmap, + .vunmap = dma_heap_dma_buf_vunmap, +}; diff --git a/drivers/dma-buf/heaps/heap-helpers.h b/drivers/dma-buf/heaps/heap-helpers.h new file mode 100644 index 000000000000..7e0a82b11c9e --- /dev/null +++ b/drivers/dma-buf/heaps/heap-helpers.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * DMABUF Heaps helper code + * + * Copyright (C) 2011 Google, Inc. + * Copyright (C) 2019 Linaro Ltd. + */ + +#ifndef _HEAP_HELPERS_H +#define _HEAP_HELPERS_H + +#include +#include + +/** + * struct dma_heap_buffer - metadata for a particular buffer + * @heap: back pointer to the heap the buffer came from + * @dmabuf: backing dma-buf for this buffer + * @size: size of the buffer + * @flags: buffer specific flags + */ +struct dma_heap_buffer { + struct dma_heap *heap; + struct dma_buf *dmabuf; + size_t size; + unsigned long flags; +}; + +struct heap_helper_buffer { + struct dma_heap_buffer heap_buffer; + + unsigned long private_flags; + void *priv_virt; + struct mutex lock; + int vmap_cnt; + void *vaddr; + pgoff_t pagecount; + struct page **pages; + struct list_head attachments; + + void (*free)(struct heap_helper_buffer *buffer); +}; + +static inline struct heap_helper_buffer *to_helper_buffer( + struct dma_heap_buffer *h) +{ + return container_of(h, struct heap_helper_buffer, heap_buffer); +} + +void INIT_HEAP_HELPER_BUFFER(struct heap_helper_buffer *buffer, + void (*free)(struct heap_helper_buffer *)); +extern const struct dma_buf_ops heap_helper_ops; + +#endif /* _HEAP_HELPERS_H */