From patchwork Mon Jul 11 12:24:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Chen X-Patchwork-Id: 589513 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D777C43334 for ; Mon, 11 Jul 2022 12:44:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231743AbiGKMoQ (ORCPT ); Mon, 11 Jul 2022 08:44:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44524 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231958AbiGKMoC (ORCPT ); Mon, 11 Jul 2022 08:44:02 -0400 Received: from sender4-op-o14.zoho.com (sender4-op-o14.zoho.com [136.143.188.14]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A635C21270 for ; Mon, 11 Jul 2022 05:43:55 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1657542513; cv=none; d=zohomail.com; s=zohoarc; b=BWLMC3it4BtPyJWYDoPgYKmbLqEhQRxv8s3RJ9kVzUq4qSI3Se1FWX6GzIcNcUQyYwPw5MwzLU3Lt+4A2Y2KLof2kHNvZ/TaGNRptdXyiv5OSs4IFQDxHO0zHG4xT5fEMhVDp2U5LmP3sF3Ah0dgo8POju7SL3GZBzVm0DwnP8o= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1657542513; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To; bh=/45RwWvpZQ8gxiW9JTrbUVV5LljPR1ktHOujlwlnKxQ=; b=mr/8H1PKbsemg6iuOktY9uH9bIO4L2xoejQBtu3J6xBCmTUVVqm5akq2/PUJNfCZEdPPquqMTLk9LYIt6L/G3ctrpuk+kNmRJ8OmO6t7fBxwWhOcKMvKK6/MSdeGJipFvolMPDc0J1iFF9SnR0/lfyKp6QllbiaiCSWF0C3OqD4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=linux.beauty; spf=pass smtp.mailfrom=me@linux.beauty; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1657542513; s=zmail; d=linux.beauty; i=me@linux.beauty; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-Id:Message-Id:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Reply-To; bh=/45RwWvpZQ8gxiW9JTrbUVV5LljPR1ktHOujlwlnKxQ=; b=NN43XqsWrzBzau+jKqb4vYqFipSvenjZhL4yn+DPsre33ZTgav2bIdy0QYA6N8rU oNotCfkx7vY9ndsfCNxE+pgGJfoOkxJSqJ34oRF3MWJuTQ2HBYanF+XR0SiEGj69Yg5 N3UGyfNPfQFxA+OJGzZH4WcxXRB28kWFRk+MtFWc= Received: from sh-lchen.ambarella.net (180.169.129.130 [180.169.129.130]) by mx.zohomail.com with SMTPS id 1657542511621198.9230621815609; Mon, 11 Jul 2022 05:28:31 -0700 (PDT) From: Li Chen To: Catalin Marinas , Will Deacon , Rob Herring , Frank Rowand , Andrew Morton Cc: Li Chen , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 4/4] sample/reserved_mem: Introduce a sample of struct page and dio support to no-map rmem Date: Mon, 11 Jul 2022 20:24:54 +0800 Message-Id: <20220711122459.13773-5-me@linux.beauty> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220711122459.13773-1-me@linux.beauty> References: <20220711122459.13773-1-me@linux.beauty> MIME-Version: 1.0 X-ZohoMailClient: External Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Li Chen This sample driver shows how to build struct pages support to no-map rmem. Signed-off-by: Li Chen Change-Id: Ie78494fa86fda40ceb73eab3b8ba505d0ad851a1 --- samples/Kconfig | 7 ++ samples/Makefile | 1 + samples/reserved_mem/Makefile | 2 + samples/reserved_mem/rmem_dio.c | 116 ++++++++++++++++++++++++++++++++ 4 files changed, 126 insertions(+) create mode 100755 samples/reserved_mem/Makefile create mode 100755 samples/reserved_mem/rmem_dio.c diff --git a/samples/Kconfig b/samples/Kconfig index b0503ef058d3..d83ba02ec215 100644 --- a/samples/Kconfig +++ b/samples/Kconfig @@ -6,6 +6,13 @@ menuconfig SAMPLES if SAMPLES +config RESERVED_MEM_DIO + tristate "Build example reserved mem dio support" + depends on OF_RESERVED_MEM_DIO_SUPPORT + help + Build kernel space sample module to show how to add struct + page and dio support to reserved memory. + config SAMPLE_AUXDISPLAY bool "auxdisplay sample" depends on CC_CAN_LINK diff --git a/samples/Makefile b/samples/Makefile index 087e0988ccc5..106a386869eb 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 # Makefile for Linux samples code +obj-$(CONFIG_RESERVED_MEM_DIO) += reserved_mem/ subdir-$(CONFIG_SAMPLE_AUXDISPLAY) += auxdisplay subdir-$(CONFIG_SAMPLE_ANDROID_BINDERFS) += binderfs obj-$(CONFIG_SAMPLE_CONFIGFS) += configfs/ diff --git a/samples/reserved_mem/Makefile b/samples/reserved_mem/Makefile new file mode 100755 index 000000000000..a4f5c8bc08dc --- /dev/null +++ b/samples/reserved_mem/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_RESERVED_MEM_DIO) += rmem_dio.o diff --git a/samples/reserved_mem/rmem_dio.c b/samples/reserved_mem/rmem_dio.c new file mode 100755 index 000000000000..ffb3395de63c --- /dev/null +++ b/samples/reserved_mem/rmem_dio.c @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Sample driver for reserved memory with struct page and dio support. + * + * wsps is abbr for with struct page support + * + * Copyright (C) 2022 Li Chen + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * dts example + * rmem: rmem@1 { + * compatible = "shared-dma-pool"; + * no-map; + * size = <0x0 0x20000000>; + * }; + * perf { + * compatible = "example,rmem"; + * memory-region = <&rmem>; + * }; + */ + +static struct reserved_mem *rmem; + +static int rmem_wsps_open(struct inode *inode, struct file *filp) +{ + return 0; +} + +static int rmem_wsps_release(struct inode *inode, + struct file *filp) +{ + return 0; +} + +static int rmem_wsps_mmap(struct file *file, + struct vm_area_struct *vma) +{ + return reserved_mem_dio_mmap(file, vma, rmem); +} + +static const struct file_operations rmem_wsps_remap_ops = { + .owner = THIS_MODULE, + .open = rmem_wsps_open, + .release = rmem_wsps_release, + .mmap = rmem_wsps_mmap, +}; + +static struct miscdevice rmem_wsps_miscdev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "rmem_wsps", + .fops = &rmem_wsps_remap_ops, +}; + +static int rmem_wsps_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + void *vaddr; + int ret; + + ret = misc_register(&rmem_wsps_miscdev); + if (ret) { + dev_err(dev, "%s: misc_register failed, %d\n", __func__, ret); + return -ENODEV; + } + + rmem = get_reserved_mem_from_dev(dev); + if (!rmem) { + dev_err(dev, "%s: failed to find reserved\n", __func__); + return -ENODEV; + } + + vaddr = reserved_mem_memremap_pages(dev, rmem); + if (IS_ERR_OR_NULL(vaddr)) + return PTR_ERR(vaddr); + + return 0; +} + +static const struct of_device_id rmem_dio_match[] = { + { + .compatible = "example,rmem", + }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, rmem_dio_match); + +static struct platform_driver rmem_wsps_driver = { + .probe = rmem_wsps_probe, + .driver = { + .name = "rmem_wsps", + .of_match_table = rmem_dio_match, + }, +}; + +static int __init rmem_wsps_init(void) +{ + return platform_driver_register(&rmem_wsps_driver); +} + +module_init(rmem_wsps_init); +MODULE_LICENSE("GPL");