From patchwork Tue Oct 12 12:29:06 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 247481 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 o9CCTVx2003074 for ; Tue, 12 Oct 2010 12:29:31 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932221Ab0JLM31 (ORCPT ); Tue, 12 Oct 2010 08:29:27 -0400 Received: from mailout3.w1.samsung.com ([210.118.77.13]:48150 "EHLO mailout3.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757214Ab0JLM3Z (ORCPT ); Tue, 12 Oct 2010 08:29:25 -0400 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Received: from eu_spt1 ([210.118.77.13]) by mailout3.w1.samsung.com (Sun Java(tm) System Messaging Server 6.3-8.04 (built Jul 29 2009; 32bit)) with ESMTP id <0LA600MWRG0ZG190@mailout3.w1.samsung.com> for linux-media@vger.kernel.org; Tue, 12 Oct 2010 13:29:23 +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 <0LA6005RSG0Y3O@spt1.w1.samsung.com> for linux-media@vger.kernel.org; Tue, 12 Oct 2010 13:29:23 +0100 (BST) Received: from mcdsrvbld02.digital.local (unknown [106.116.37.23]) by linux.samsung.com (Postfix) with ESMTP id 12DA3270067; Tue, 12 Oct 2010 14:24:37 +0200 (CEST) Date: Tue, 12 Oct 2010 14:29:06 +0200 From: Marek Szyprowski Subject: [PATCH v2 6/6] v4l: videobuf2: add CMA allocator In-reply-to: <1286886546-18058-1-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, p.osciak@samsung.com Message-id: <1286886546-18058-7-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.7.1 References: <1286886546-18058-1-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]); Tue, 12 Oct 2010 12:29:31 +0000 (UTC) diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig index 4dd14c2..2da9254 100644 --- a/drivers/media/video/Kconfig +++ b/drivers/media/video/Kconfig @@ -65,6 +65,11 @@ config VIDEOBUF2_VMALLOC select VIDEOBUF2_MEMOPS tristate +config VIDEOBUF2_CMA + depends on CMA + select VIDEOBUF2_CORE + select VIDEOBUF2_MEMOPS + tristate # # Multimedia Video device configuration # diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile index b3ae7d4..d1fc8cf 100644 --- a/drivers/media/video/Makefile +++ b/drivers/media/video/Makefile @@ -121,6 +121,7 @@ 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-$(CONFIG_VIDEOBUF2_CMA) += videobuf2-cma.o obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o diff --git a/drivers/media/video/videobuf2-cma.c b/drivers/media/video/videobuf2-cma.c new file mode 100644 index 0000000..d949c25 --- /dev/null +++ b/drivers/media/video/videobuf2-cma.c @@ -0,0 +1,250 @@ +/* + * videobuf2-cma.c - CMA 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 + +#include +#include + +struct vb2_cma_conf { + struct vb2_alloc_ctx alloc_ctx; + struct device *dev; + const char *type; + unsigned long alignment; +}; + +struct vb2_cma_buf { + struct vb2_cma_conf *conf; + dma_addr_t paddr; + unsigned long size; + unsigned int refcount; + struct vm_area_struct *vma; +}; + +static void *vb2_cma_alloc(const struct vb2_alloc_ctx *alloc_ctx, + unsigned long size) +{ + struct vb2_cma_conf *conf = + container_of(alloc_ctx, struct vb2_cma_conf, alloc_ctx); + struct vb2_cma_buf *buf; + + buf = kzalloc(sizeof *buf, GFP_KERNEL); + if (!buf) + return ERR_PTR(-ENOMEM); + + buf->paddr = cma_alloc(conf->dev, conf->type, size, conf->alignment); + if (IS_ERR((void *)buf->paddr)) { + printk(KERN_ERR "cma_alloc of size %ld failed\n", size); + kfree(buf); + return ERR_PTR(-ENOMEM); + } + + buf->conf = conf; + buf->size = size; + buf->refcount++; + + printk(KERN_DEBUG "Allocated cma mem of size %ld at paddr=0x%08x\n", + buf->size, buf->paddr); + + return buf; +} + +static void vb2_cma_put(void *buf_priv) +{ + struct vb2_cma_buf *buf = buf_priv; + + buf->refcount--; + + if (0 == buf->refcount) { + cma_free(buf->paddr); + kfree(buf); + } +} + +static unsigned long vb2_cma_paddr(void *buf_priv) +{ + struct vb2_cma_buf *buf = buf_priv; + + return buf->paddr; +} + +static unsigned int vb2_cma_num_users(void *buf_priv) +{ + struct vb2_cma_buf *buf = buf_priv; + + return buf->refcount; +} + +static void vb2_cma_vm_open(struct vm_area_struct *vma) +{ + struct vb2_cma_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_cma_vm_close(struct vm_area_struct *vma) +{ + struct vb2_cma_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_cma_put(buf); +} + +static const struct vm_operations_struct vb2_cma_vm_ops = { + .open = vb2_cma_vm_open, + .close = vb2_cma_vm_close, +}; + +static int vb2_cma_mmap(void *buf_priv, struct vm_area_struct *vma) +{ + struct vb2_cma_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_cma_vm_ops, buf); +} + +static void *vb2_cma_get_userptr(unsigned long vaddr, unsigned long size) +{ + struct vb2_cma_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_cma_put_userptr(void *mem_priv) +{ + struct vb2_cma_buf *buf = mem_priv; + + if (!buf) + return; + + vb2_put_userptr(buf->vma); + kfree(buf); +} + +static const struct vb2_mem_ops vb2_cma_ops = { + .alloc = vb2_cma_alloc, + .put = vb2_cma_put, + .paddr = vb2_cma_paddr, + .mmap = vb2_cma_mmap, + .get_userptr = vb2_cma_get_userptr, + .put_userptr = vb2_cma_put_userptr, + .num_users = vb2_cma_num_users, +}; + +struct vb2_alloc_ctx *vb2_cma_init(struct device *dev, const char *type, + unsigned long alignment) +{ + struct vb2_cma_conf *conf; + + conf = kzalloc(sizeof *conf, GFP_KERNEL); + if (!conf) + return ERR_PTR(-ENOMEM); + + conf->dev = dev; + conf->type = type; + conf->alignment = alignment; + conf->alloc_ctx.mem_ops = &vb2_cma_ops; + + return &conf->alloc_ctx; +} +EXPORT_SYMBOL_GPL(vb2_cma_init); + +void vb2_cma_cleanup(struct vb2_alloc_ctx *alloc_ctx) +{ + struct vb2_cma_conf *conf = + container_of(alloc_ctx, struct vb2_cma_conf, alloc_ctx); + + kfree(conf); +} +EXPORT_SYMBOL_GPL(vb2_cma_cleanup); + +struct vb2_alloc_ctx **vb2_cma_init_multi(struct device *dev, + unsigned int num_planes, + const char *types[], + unsigned long alignments[]) +{ + struct vb2_alloc_ctx **alloc_ctxes; + struct vb2_cma_conf *cma_conf; + unsigned int i; + + alloc_ctxes = kzalloc((sizeof *alloc_ctxes + sizeof *cma_conf) + * num_planes, GFP_KERNEL); + if (!alloc_ctxes) + return ERR_PTR(-ENOMEM); + + cma_conf = (void *)(alloc_ctxes + num_planes); + + for (i = 0; i < num_planes; ++i, ++cma_conf) { + alloc_ctxes[i] = &cma_conf->alloc_ctx; + cma_conf->dev = dev; + cma_conf->type = types[i]; + cma_conf->alignment = alignments[i]; + cma_conf->alloc_ctx.mem_ops = &vb2_cma_ops; + } + + return alloc_ctxes; +} +EXPORT_SYMBOL_GPL(vb2_cma_init_multi); + +void vb2_cma_cleanup_multi(struct vb2_alloc_ctx **alloc_ctxes) +{ + kfree(alloc_ctxes); +} +EXPORT_SYMBOL_GPL(vb2_cma_cleanup_multi); + +MODULE_DESCRIPTION("CMA allocator handling routines for videobuf2"); +MODULE_AUTHOR("Pawel Osciak"); +MODULE_LICENSE("GPL"); diff --git a/include/media/videobuf2-cma.h b/include/media/videobuf2-cma.h new file mode 100644 index 0000000..557eeb0 --- /dev/null +++ b/include/media/videobuf2-cma.h @@ -0,0 +1,25 @@ +/* + * videobuf2-cma.h - CMA 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. + */ + +struct vb2_alloc_ctx *vb2_cma_init(struct device *dev, const char *type, + unsigned long alignment); +void vb2_cma_cleanup(struct vb2_alloc_ctx *alloc_ctx); + +struct vb2_alloc_ctx **vb2_cma_init_multi(struct device *dev, + unsigned int num_planes, const char *types[], + unsigned long alignments[]); +void vb2_cma_cleanup_multi(struct vb2_alloc_ctx **alloc_ctxes); + +struct vb2_alloc_ctx *vb2_cma_init(struct device *dev, const char *type, + unsigned long alignment); +void vb2_cma_cleanup(struct vb2_alloc_ctx *alloc_ctx); +