From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D62F6C04E87 for ; Mon, 20 May 2019 09:27:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AAD9E206BA for ; Mon, 20 May 2019 09:27:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732117AbfETJ1D (ORCPT ); Mon, 20 May 2019 05:27:03 -0400 Received: from mx2.suse.de ([195.135.220.15]:39744 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730445AbfETJ0v (ORCPT ); Mon, 20 May 2019 05:26:51 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id D71DCADC1; Mon, 20 May 2019 09:26:49 +0000 (UTC) From: Takashi Iwai To: Luis Chamberlain Cc: Greg Kroah-Hartman , "Rafael J . Wysocki" , linux-kernel@vger.kernel.org Subject: [PATCH 4/5] firmware: Factor out the paged buffer handling code Date: Mon, 20 May 2019 11:26:46 +0200 Message-Id: <20190520092647.8622-5-tiwai@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20190520092647.8622-1-tiwai@suse.de> References: <20190520092647.8622-1-tiwai@suse.de> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is merely a preparation for the upcoming compressed firmware support and no functional changes. It moves the code to handle the paged buffer allocation and mapping out of fallback.c into the main code, so that they can be used commonly. Signed-off-by: Takashi Iwai --- drivers/base/firmware_loader/fallback.c | 61 ++++----------------------------- drivers/base/firmware_loader/firmware.h | 4 +++ drivers/base/firmware_loader/main.c | 52 ++++++++++++++++++++++++++++ 3 files changed, 63 insertions(+), 54 deletions(-) diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c index b5cd96fd0e77..80b20f6c494f 100644 --- a/drivers/base/firmware_loader/fallback.c +++ b/drivers/base/firmware_loader/fallback.c @@ -219,25 +219,6 @@ static ssize_t firmware_loading_show(struct device *dev, return sprintf(buf, "%d\n", loading); } -/* one pages buffer should be mapped/unmapped only once */ -static int map_fw_priv_pages(struct fw_priv *fw_priv) -{ - if (!fw_priv->pages) - return 0; - - vunmap(fw_priv->data); - fw_priv->data = vmap(fw_priv->pages, fw_priv->nr_pages, 0, - PAGE_KERNEL_RO); - if (!fw_priv->data) - return -ENOMEM; - - /* page table is no longer needed after mapping, let's free */ - kvfree(fw_priv->pages); - fw_priv->pages = NULL; - - return 0; -} - /** * firmware_loading_store() - set value in the 'loading' control file * @dev: device pointer @@ -283,7 +264,7 @@ static ssize_t firmware_loading_store(struct device *dev, * see the mapped 'buf->data' once the loading * is completed. * */ - rc = map_fw_priv_pages(fw_priv); + rc = fw_map_paged_buf(fw_priv); if (rc) dev_err(dev, "%s: map pages failed\n", __func__); @@ -388,41 +369,13 @@ static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj, static int fw_realloc_pages(struct fw_sysfs *fw_sysfs, int min_size) { - struct fw_priv *fw_priv= fw_sysfs->fw_priv; - int pages_needed = PAGE_ALIGN(min_size) >> PAGE_SHIFT; - - /* If the array of pages is too small, grow it... */ - if (fw_priv->page_array_size < pages_needed) { - int new_array_size = max(pages_needed, - fw_priv->page_array_size * 2); - struct page **new_pages; + int err; - new_pages = kvmalloc_array(new_array_size, sizeof(void *), - GFP_KERNEL); - if (!new_pages) { - fw_load_abort(fw_sysfs); - return -ENOMEM; - } - memcpy(new_pages, fw_priv->pages, - fw_priv->page_array_size * sizeof(void *)); - memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) * - (new_array_size - fw_priv->page_array_size)); - kvfree(fw_priv->pages); - fw_priv->pages = new_pages; - fw_priv->page_array_size = new_array_size; - } - - while (fw_priv->nr_pages < pages_needed) { - fw_priv->pages[fw_priv->nr_pages] = - alloc_page(GFP_KERNEL | __GFP_HIGHMEM); - - if (!fw_priv->pages[fw_priv->nr_pages]) { - fw_load_abort(fw_sysfs); - return -ENOMEM; - } - fw_priv->nr_pages++; - } - return 0; + err = fw_grow_paged_buf(fw_sysfs->fw_priv, + PAGE_ALIGN(min_size) >> PAGE_SHIFT); + if (err) + fw_load_abort(fw_sysfs); + return err; } /** diff --git a/drivers/base/firmware_loader/firmware.h b/drivers/base/firmware_loader/firmware.h index d20d4e7f9e71..35f4e58b2d98 100644 --- a/drivers/base/firmware_loader/firmware.h +++ b/drivers/base/firmware_loader/firmware.h @@ -135,8 +135,12 @@ int assign_fw(struct firmware *fw, struct device *device, #ifdef CONFIG_FW_LOADER_USER_HELPER void fw_free_paged_buf(struct fw_priv *fw_priv); +int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed); +int fw_map_paged_buf(struct fw_priv *fw_priv); #else static inline void fw_free_paged_buf(struct fw_priv *fw_priv) {} +int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed) { return -ENXIO; } +int fw_map_paged_buf(struct fw_priv *fw_priv) { return -ENXIO; } #endif #endif /* __FIRMWARE_LOADER_H */ diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index 2e74a1b73dae..7e12732f4705 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -281,6 +281,58 @@ void fw_free_paged_buf(struct fw_priv *fw_priv) fw_priv->page_array_size = 0; fw_priv->nr_pages = 0; } + +int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed) +{ + /* If the array of pages is too small, grow it */ + if (fw_priv->page_array_size < pages_needed) { + int new_array_size = max(pages_needed, + fw_priv->page_array_size * 2); + struct page **new_pages; + + new_pages = kvmalloc_array(new_array_size, sizeof(void *), + GFP_KERNEL); + if (!new_pages) + return -ENOMEM; + memcpy(new_pages, fw_priv->pages, + fw_priv->page_array_size * sizeof(void *)); + memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) * + (new_array_size - fw_priv->page_array_size)); + kvfree(fw_priv->pages); + fw_priv->pages = new_pages; + fw_priv->page_array_size = new_array_size; + } + + while (fw_priv->nr_pages < pages_needed) { + fw_priv->pages[fw_priv->nr_pages] = + alloc_page(GFP_KERNEL | __GFP_HIGHMEM); + + if (!fw_priv->pages[fw_priv->nr_pages]) + return -ENOMEM; + fw_priv->nr_pages++; + } + + return 0; +} + +int fw_map_paged_buf(struct fw_priv *fw_priv) +{ + /* one pages buffer should be mapped/unmapped only once */ + if (!fw_priv->pages) + return 0; + + vunmap(fw_priv->data); + fw_priv->data = vmap(fw_priv->pages, fw_priv->nr_pages, 0, + PAGE_KERNEL_RO); + if (!fw_priv->data) + return -ENOMEM; + + /* page table is no longer needed after mapping, let's free */ + kvfree(fw_priv->pages); + fw_priv->pages = NULL; + + return 0; +} #endif /* direct firmware loading support */ -- 2.16.4