From patchwork Wed Oct 20 06:41:09 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 267571 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 o9K6fc2T003096 for ; Wed, 20 Oct 2010 06:41:39 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758201Ab0JTGl2 (ORCPT ); Wed, 20 Oct 2010 02:41:28 -0400 Received: from mailout4.w1.samsung.com ([210.118.77.14]:14617 "EHLO mailout4.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758114Ab0JTGl1 (ORCPT ); Wed, 20 Oct 2010 02:41:27 -0400 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Received: from eu_spt2 ([210.118.77.14]) by mailout4.w1.samsung.com (Sun Java(tm) System Messaging Server 6.3-8.04 (built Jul 29 2009; 32bit)) with ESMTP id <0LAK009ATT8ZUS20@mailout4.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 spt2.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LAK00KKGT8YAC@spt2.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 06BAE270052; Wed, 20 Oct 2010 08:41:02 +0200 (CEST) Date: Wed, 20 Oct 2010 08:41:09 +0200 From: Marek Szyprowski Subject: [PATCH 3/7] v4l: videobuf2: add vmalloc 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: <1287556873-23179-4-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.7.1 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 06:41:39 +0000 (UTC) diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig index 2acb0f8..83d49a7 100644 --- a/drivers/media/video/Kconfig +++ b/drivers/media/video/Kconfig @@ -55,6 +55,11 @@ config VIDEOBUF2_CORE config VIDEOBUF2_MEMOPS tristate +config VIDEOBUF2_VMALLOC + select VIDEOBUF2_CORE + select VIDEOBUF2_MEMOPS + tristate + # # Multimedia Video device configuration # diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile index 77cc798..18f68fc 100644 --- a/drivers/media/video/Makefile +++ b/drivers/media/video/Makefile @@ -119,6 +119,7 @@ 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_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o diff --git a/drivers/media/video/videobuf2-vmalloc.c b/drivers/media/video/videobuf2-vmalloc.c new file mode 100644 index 0000000..3310900 --- /dev/null +++ b/drivers/media/video/videobuf2-vmalloc.c @@ -0,0 +1,177 @@ +/* + * videobuf2-vmalloc.c - vmalloc 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 + +#include +#include + +struct vb2_vmalloc_conf { + struct vb2_alloc_ctx alloc_ctx; +}; + +struct vb2_vmalloc_buf { + void *vaddr; + unsigned long size; + unsigned int refcount; +}; + +static void *vb2_vmalloc_alloc(const struct vb2_alloc_ctx *alloc_ctx, + unsigned long size) +{ + struct vb2_vmalloc_buf *buf; + + buf = kzalloc(sizeof *buf, GFP_KERNEL); + if (!buf) + return NULL; + + buf->size = size; + buf->vaddr = vmalloc_user(buf->size); + if (!buf->vaddr) { + printk(KERN_ERR "vmalloc of size %ld failed\n", buf->size); + kfree(buf); + return NULL; + } + + buf->refcount++; + printk(KERN_DEBUG "Allocated vmalloc buffer of size %ld at vaddr=%p\n", + buf->size, buf->vaddr); + + return buf; +} + +static void vb2_vmalloc_put(void *buf_priv) +{ + struct vb2_vmalloc_buf *buf = buf_priv; + + buf->refcount--; + + if (0 == buf->refcount) { + printk(KERN_DEBUG "%s: Freeing vmalloc mem at vaddr=%p\n", + __func__, buf->vaddr); + vfree(buf->vaddr); + kfree(buf); + } +} + +static void *vb2_vmalloc_vaddr(void *buf_priv) +{ + struct vb2_vmalloc_buf *buf = buf_priv; + + BUG_ON(!buf); + + if (!buf->vaddr) { + printk(KERN_ERR "Address of an unallocated " + "plane requested\n"); + return NULL; + } + + return buf->vaddr; +} + +static unsigned int vb2_vmalloc_num_users(void *buf_priv) +{ + struct vb2_vmalloc_buf *buf = buf_priv; + + return buf->refcount; +} + +/* TODO generalize and extract to core as much as possible */ +static void vb2_vmalloc_vm_open(struct vm_area_struct *vma) +{ + struct vb2_vmalloc_buf *buf = vma->vm_private_data; + + printk(KERN_DEBUG "%s vmalloc_priv: %p, refcount: %d, " + "vma: %08lx-%08lx\n", __func__, buf, buf->refcount, + vma->vm_start, vma->vm_end); + + buf->refcount++; +} + +static void vb2_vmalloc_vm_close(struct vm_area_struct *vma) +{ + struct vb2_vmalloc_buf *buf = vma->vm_private_data; + + printk(KERN_DEBUG "%s vmalloc_priv: %p, refcount: %d, " + "vma: %08lx-%08lx\n", __func__, buf, buf->refcount, + vma->vm_start, vma->vm_end); + + vb2_vmalloc_put(buf); +} + +static const struct vm_operations_struct vb2_vmalloc_vm_ops = { + .open = vb2_vmalloc_vm_open, + .close = vb2_vmalloc_vm_close, +}; + +static int vb2_vmalloc_mmap(void *buf_priv, struct vm_area_struct *vma) +{ + struct vb2_vmalloc_buf *buf = buf_priv; + int ret; + + if (!buf) { + printk(KERN_ERR "No memory to map\n"); + return -EINVAL; + } + + ret = remap_vmalloc_range(vma, buf->vaddr, 0); + if (ret) { + printk(KERN_ERR "Remapping vmalloc memory, error: %d\n", ret); + return ret; + } + + vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; + vma->vm_private_data = buf; + vma->vm_ops = &vb2_vmalloc_vm_ops; + + vb2_vmalloc_vm_open(vma); + + return 0; +} + +static const struct vb2_mem_ops vb2_vmalloc_ops = { + .alloc = vb2_vmalloc_alloc, + .put = vb2_vmalloc_put, + .vaddr = vb2_vmalloc_vaddr, + .mmap = vb2_vmalloc_mmap, + .num_users = vb2_vmalloc_num_users, +}; + +struct vb2_alloc_ctx *vb2_vmalloc_init(void) +{ + struct vb2_vmalloc_conf *conf; + + conf = kzalloc(sizeof *conf, GFP_KERNEL); + if (!conf) + return ERR_PTR(-ENOMEM); + + conf->alloc_ctx.mem_ops = &vb2_vmalloc_ops; + + return &conf->alloc_ctx; +} +EXPORT_SYMBOL_GPL(vb2_vmalloc_init); + +void vb2_vmalloc_cleanup(struct vb2_alloc_ctx *alloc_ctx) +{ + struct vb2_vmalloc_conf *conf = + container_of(alloc_ctx, struct vb2_vmalloc_conf, alloc_ctx); + + kfree(conf); +} +EXPORT_SYMBOL_GPL(vb2_vmalloc_cleanup); + +MODULE_DESCRIPTION("vmalloc memory handling routines for videobuf2"); +MODULE_AUTHOR("Pawel Osciak"); +MODULE_LICENSE("GPL"); diff --git a/include/media/videobuf2-vmalloc.h b/include/media/videobuf2-vmalloc.h new file mode 100644 index 0000000..7612f9f --- /dev/null +++ b/include/media/videobuf2-vmalloc.h @@ -0,0 +1,16 @@ +/* + * videobuf2-vmalloc.h - vmalloc 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 + +struct vb2_alloc_ctx *vb2_vmalloc_init(void); +void vb2_vmalloc_cleanup(struct vb2_alloc_ctx *alloc_ctx);