From patchwork Wed Oct 20 06:41:10 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 267541 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id o9K6fYMk003059 for ; Wed, 20 Oct 2010 06:41:34 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758215Ab0JTGl3 (ORCPT ); Wed, 20 Oct 2010 02:41:29 -0400 Received: from mailout1.w1.samsung.com ([210.118.77.11]:29173 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758053Ab0JTGl1 (ORCPT ); Wed, 20 Oct 2010 02:41:27 -0400 Received: from eu_spt1 (mailout1.w1.samsung.com [210.118.77.11]) by mailout1.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTP id <0LAK00D2TT8ZO4@mailout1.w1.samsung.com> for linux-media@vger.kernel.org; Wed, 20 Oct 2010 07:41:23 +0100 (BST) Received: from linux.samsung.com ([106.116.38.10]) by spt1.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LAK005HDT8YLV@spt1.w1.samsung.com> for linux-media@vger.kernel.org; Wed, 20 Oct 2010 07:41:23 +0100 (BST) Received: from mcdsrvbld02.digital.local (unknown [106.116.37.23]) by linux.samsung.com (Postfix) with ESMTP id 09BDF270053; Wed, 20 Oct 2010 08:41:02 +0200 (CEST) Date: Wed, 20 Oct 2010 08:41:10 +0200 From: Marek Szyprowski Subject: [PATCH 4/7] v4l: videobuf2: add DMA coherent allocator In-reply-to: <1287556873-23179-1-git-send-email-m.szyprowski@samsung.com> To: linux-media@vger.kernel.org Cc: m.szyprowski@samsung.com, pawel@osciak.com, kyungmin.park@samsung.com Message-id: <1287556873-23179-5-git-send-email-m.szyprowski@samsung.com> MIME-version: 1.0 X-Mailer: git-send-email 1.7.1 Content-type: TEXT/PLAIN Content-transfer-encoding: 7BIT References: <1287556873-23179-1-git-send-email-m.szyprowski@samsung.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Wed, 20 Oct 2010 06:41:34 +0000 (UTC) diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig index 83d49a7..2143112 100644 --- a/drivers/media/video/Kconfig +++ b/drivers/media/video/Kconfig @@ -55,6 +55,11 @@ config VIDEOBUF2_CORE config VIDEOBUF2_MEMOPS tristate +config VIDEOBUF2_DMA_COHERENT + select VIDEOBUF2_CORE + select VIDEOBUF2_MEMOPS + tristate + config VIDEOBUF2_VMALLOC select VIDEOBUF2_CORE select VIDEOBUF2_MEMOPS diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile index 18f68fc..b3ae7d4 100644 --- a/drivers/media/video/Makefile +++ b/drivers/media/video/Makefile @@ -120,6 +120,7 @@ obj-$(CONFIG_VIDEO_BTCX) += btcx-risc.o obj-$(CONFIG_VIDEOBUF2_CORE) += videobuf2-core.o obj-$(CONFIG_VIDEOBUF2_MEMOPS) += videobuf2-memops.o obj-$(CONFIG_VIDEOBUF2_VMALLOC) += videobuf2-vmalloc.o +obj-$(CONFIG_VIDEOBUF2_DMA_COHERENT) += videobuf2-dma_coherent.o obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o diff --git a/drivers/media/video/videobuf2-dma-coherent.c b/drivers/media/video/videobuf2-dma-coherent.c new file mode 100644 index 0000000..761f366 --- /dev/null +++ b/drivers/media/video/videobuf2-dma-coherent.c @@ -0,0 +1,208 @@ +/* + * videobuf2-dma-coherent.c - DMA coherent memory allocator for videobuf2 + * + * Copyright (C) 2010 Samsung Electronics + * + * Author: Pawel Osciak + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation. + */ + +#include +#include + +#include +#include + +struct vb2_dc_conf { + struct vb2_alloc_ctx alloc_ctx; + struct device *dev; +}; + +struct vb2_dc_buf { + struct vb2_dc_conf *conf; + void *vaddr; + dma_addr_t paddr; + unsigned long size; + unsigned int refcount; + struct vm_area_struct *vma; +}; + +struct vb2_alloc_ctx *vb2_dma_coherent_init(struct device *dev) +{ + struct vb2_dc_conf *conf; + + conf = kzalloc(sizeof *conf, GFP_KERNEL); + if (!conf) + return ERR_PTR(-ENOMEM); + + conf->dev = dev; + + return &conf->alloc_ctx; +} +EXPORT_SYMBOL_GPL(vb2_dma_coherent_init); + +void vb2_dma_coherent_cleanup(struct vb2_alloc_ctx *alloc_ctx) +{ + struct vb2_dc_conf *conf = + container_of(alloc_ctx, struct vb2_dc_conf, alloc_ctx); + + kfree(conf); +} +EXPORT_SYMBOL_GPL(vb2_dma_coherent_cleanup); + +static void *vb2_dma_coherent_alloc(const struct vb2_alloc_ctx *alloc_ctx, + unsigned long size) +{ + struct vb2_dc_conf *conf = + container_of(alloc_ctx, struct vb2_dc_conf, alloc_ctx); + struct vb2_dc_buf *buf; + + buf = kzalloc(sizeof *buf, GFP_KERNEL); + if (!buf) + return ERR_PTR(-ENOMEM); + + buf->vaddr = dma_alloc_coherent(conf->dev, buf->size, + &buf->paddr, GFP_KERNEL); + if (!buf->vaddr) { + dev_err(conf->dev, "dma_alloc_coherent of size %ld failed\n", + buf->size); + kfree(buf); + return ERR_PTR(-ENOMEM); + } + + buf->conf = conf; + buf->size = size; + + return buf; +} + +static void vb2_dma_coherent_put(void *buf_priv) +{ + struct vb2_dc_buf *buf = buf_priv; + + buf->refcount--; + + if (0 == buf->refcount) { + dma_free_coherent(buf->conf->dev, buf->size, buf->vaddr, + buf->paddr); + kfree(buf); + } +} + +static unsigned long vb2_dma_coherent_paddr(void *buf_priv) +{ + struct vb2_dc_buf *buf = buf_priv; + + return buf->paddr; +} + +static unsigned int vb2_dma_coherent_num_users(void *buf_priv) +{ + struct vb2_dc_buf *buf = buf_priv; + + return buf->refcount; +} + +static void vb2_dma_coherent_vm_open(struct vm_area_struct *vma) +{ + struct vb2_dc_buf *buf = vma->vm_private_data; + + printk(KERN_DEBUG "%s cma_priv: %p, refcount: %d, " + "vma: %08lx-%08lx\n", __func__, buf, buf->refcount, + vma->vm_start, vma->vm_end); + + buf->refcount++; +} + +static void vb2_dma_coherent_vm_close(struct vm_area_struct *vma) +{ + struct vb2_dc_buf *buf = vma->vm_private_data; + + printk(KERN_DEBUG "%s cma_priv: %p, refcount: %d, " + "vma: %08lx-%08lx\n", __func__, buf, buf->refcount, + vma->vm_start, vma->vm_end); + + vb2_dma_coherent_put(buf); +} + +static const struct vm_operations_struct vb2_dma_coherent_vm_ops = { + .open = vb2_dma_coherent_vm_open, + .close = vb2_dma_coherent_vm_close, +}; + +static int vb2_dma_coherent_mmap(void *buf_priv, struct vm_area_struct *vma) +{ + struct vb2_dc_buf *buf = buf_priv; + + if (!buf) { + printk(KERN_ERR "No memory to map\n"); + return -EINVAL; + } + + return vb2_mmap_pfn_range(vma, buf->paddr, buf->size, + &vb2_dma_coherent_vm_ops, buf); +} + +static void *vb2_dma_coherent_get_userptr(unsigned long vaddr, + unsigned long size) +{ + struct vb2_dc_buf *buf; + unsigned long paddr = 0; + int ret; + + buf = kzalloc(sizeof *buf, GFP_KERNEL); + if (!buf) + return ERR_PTR(-ENOMEM); + + buf->vma = vb2_get_userptr(vaddr); + if (!buf->vma) { + printk(KERN_ERR "Failed acquiring VMA for vaddr 0x%08lx\n", + vaddr); + ret = -EINVAL; + goto done; + } + + ret = vb2_contig_verify_userptr(buf->vma, vaddr, size, &paddr); + if (ret) { + vb2_put_userptr(buf->vma); + goto done; + } + + buf->size = size; + buf->paddr = paddr; + + return buf; + +done: + kfree(buf); + return ERR_PTR(ret); +} + +static void vb2_dma_coherent_put_userptr(void *mem_priv) +{ + struct vb2_dc_buf *buf = mem_priv; + + if (!buf) + return; + + vb2_put_userptr(buf->vma); + kfree(buf); +} + +const struct vb2_mem_ops vb2_dma_coherent_ops = { + .alloc = vb2_dma_coherent_alloc, + .put = vb2_dma_coherent_put, + .paddr = vb2_dma_coherent_paddr, + .mmap = vb2_dma_coherent_mmap, + .get_userptr = vb2_dma_coherent_get_userptr, + .put_userptr = vb2_dma_coherent_put_userptr, + .num_users = vb2_dma_coherent_num_users, +}; + +MODULE_DESCRIPTION("DMA-coherent memory handling routines for videobuf2"); +MODULE_AUTHOR("Pawel Osciak"); +MODULE_LICENSE("GPL"); + diff --git a/include/media/videobuf2-dma-coherent.h b/include/media/videobuf2-dma-coherent.h new file mode 100644 index 0000000..102b1a7 --- /dev/null +++ b/include/media/videobuf2-dma-coherent.h @@ -0,0 +1,21 @@ +/* + * videobuf2-dma-coherent.h - DMA coherent memory allocator for videobuf2 + * + * Copyright (C) 2010 Samsung Electronics + * + * Author: Pawel Osciak + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation. + */ + +#ifndef _MEDIA_VIDEOBUF2_DMA_COHERENT_H +#define _MEDIA_VIDEOBUF2_DMA_COHERENT_H + +#include + +void *vb2_dma_coherent_init(struct device *dev); +void vb2_dma_coherent_cleanup(struct vb2_alloc_ctx *alloc_ctx); + +#endif