From patchwork Fri Apr 29 10:08:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 12831731 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 65539C4332F for ; Fri, 29 Apr 2022 10:08:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356800AbiD2KL6 (ORCPT ); Fri, 29 Apr 2022 06:11:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42200 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356515AbiD2KL5 (ORCPT ); Fri, 29 Apr 2022 06:11:57 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91D3AC6654 for ; Fri, 29 Apr 2022 03:08:39 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 0488F210F5; Fri, 29 Apr 2022 10:08:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1651226918; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=v0WMJRxLoqjw+Wq7byINl/aZixMf3N2/EKUen6EMZaw=; b=q8iOlQhXb4LLLQPaKz6lHDc5Q4ECmnBI0sZH50DyhggKxRWBOtz8h0hL2QrauUHcBPS/kD N1DxfDKCJDcLDP2VTVkFRt7T9SbGudQvGocULf7F9iEAiZ8h+PPn2aZ5wGf+MVW1Mx3s7q /EFd/twtBzN5fyzRSEfWxWcKnchDSlY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1651226918; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=v0WMJRxLoqjw+Wq7byINl/aZixMf3N2/EKUen6EMZaw=; b=o3nxk3pHg8IQ8ixffVnkWl+ZXZGz/nCOIjkHRAS89LuAkCUkbSOiuy3l7g1X7nHa4b+pk8 /znqnty/Ivk+kwBg== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id C855713B08; Fri, 29 Apr 2022 10:08:37 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id wPsTMCW5a2JiFwAAMHmgww (envelope-from ); Fri, 29 Apr 2022 10:08:37 +0000 From: Thomas Zimmermann To: javierm@redhat.com, sam@ravnborg.org, daniel@ffwll.ch, deller@gmx.de, airlied@linux.ie, maarten.lankhorst@linux.intel.com Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann Subject: [PATCH v4 3/5] fbdev: Refactor implementation of page_mkwrite Date: Fri, 29 Apr 2022 12:08:32 +0200 Message-Id: <20220429100834.18898-4-tzimmermann@suse.de> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220429100834.18898-1-tzimmermann@suse.de> References: <20220429100834.18898-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Refactor the page-write handler for deferred I/O. Drivers use the function to let fbdev track written pages of mmap'ed framebuffer memory. v3: * keep locking within track-pages function for readability (Sam) v2: * don't export the helper until we have an external caller Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas --- drivers/video/fbdev/core/fb_defio.c | 53 +++++++++++++++++++++-------- 1 file changed, 38 insertions(+), 15 deletions(-) diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c index 1bdef5c241f7..3f9bb4725119 100644 --- a/drivers/video/fbdev/core/fb_defio.c +++ b/drivers/video/fbdev/core/fb_defio.c @@ -143,26 +143,17 @@ int fb_deferred_io_fsync(struct file *file, loff_t start, loff_t end, int datasy } EXPORT_SYMBOL_GPL(fb_deferred_io_fsync); -/* vm_ops->page_mkwrite handler */ -static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) +/* + * Adds a page to the dirty list. Call this from struct + * vm_operations_struct.page_mkwrite. + */ +static vm_fault_t fb_deferred_io_track_page(struct fb_info *info, unsigned long offset, + struct page *page) { - struct page *page = vmf->page; - struct fb_info *info = vmf->vma->vm_private_data; struct fb_deferred_io *fbdefio = info->fbdefio; struct fb_deferred_io_pageref *pageref; - unsigned long offset; vm_fault_t ret; - offset = (vmf->address - vmf->vma->vm_start); - - /* this is a callback we get when userspace first tries to - write to the page. we schedule a workqueue. that workqueue - will eventually mkclean the touched pages and execute the - deferred framebuffer IO. then if userspace touches a page - again, we repeat the same scheme */ - - file_update_time(vmf->vma->vm_file); - /* protect against the workqueue changing the page list */ mutex_lock(&fbdefio->lock); @@ -197,6 +188,38 @@ static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) return ret; } +/* + * fb_deferred_io_page_mkwrite - Mark a page as written for deferred I/O + * @fb_info: The fbdev info structure + * @vmf: The VM fault + * + * This is a callback we get when userspace first tries to + * write to the page. We schedule a workqueue. That workqueue + * will eventually mkclean the touched pages and execute the + * deferred framebuffer IO. Then if userspace touches a page + * again, we repeat the same scheme. + * + * Returns: + * VM_FAULT_LOCKED on success, or a VM_FAULT error otherwise. + */ +static vm_fault_t fb_deferred_io_page_mkwrite(struct fb_info *info, struct vm_fault *vmf) +{ + unsigned long offset = vmf->address - vmf->vma->vm_start; + struct page *page = vmf->page; + + file_update_time(vmf->vma->vm_file); + + return fb_deferred_io_track_page(info, offset, page); +} + +/* vm_ops->page_mkwrite handler */ +static vm_fault_t fb_deferred_io_mkwrite(struct vm_fault *vmf) +{ + struct fb_info *info = vmf->vma->vm_private_data; + + return fb_deferred_io_page_mkwrite(info, vmf); +} + static const struct vm_operations_struct fb_deferred_io_vm_ops = { .fault = fb_deferred_io_fault, .page_mkwrite = fb_deferred_io_mkwrite,