From patchwork Wed Dec 2 08:07:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paolo Bonzini X-Patchwork-Id: 1409434 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=duzcYjSd; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4CmBlJ70fRz9sPB for ; Wed, 2 Dec 2020 19:21:48 +1100 (AEDT) Received: from localhost ([::1]:42816 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kkNOU-0000Fd-TD for incoming@patchwork.ozlabs.org; Wed, 02 Dec 2020 03:21:46 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:39730) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kkNCB-0002Ww-Ac for qemu-devel@nongnu.org; Wed, 02 Dec 2020 03:09:03 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:42545) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kkNC6-0003ar-LI for qemu-devel@nongnu.org; Wed, 02 Dec 2020 03:09:02 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606896538; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iSQM4TycOU/aZ/A6V6wM4WejKUtcydIgnuYHCLvPHu0=; b=duzcYjSdztCjIIkQw5Q1Rw/+xfKNlnYzfjh9PZYNpuIvQrTQWKSBzsF+zgUd/6ZWkVb+8N DhWL85e5ROcYSCYGniTfMuwPriVeQcFZ6zqZazWs7PkqgfWmpEr3cP/qVaGpdU/9T5FxuL TZ/A+qF45I76OS5bfZd8gwiKIRHA+uQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-415-mMFdmw89NDG2CmphFEDgZQ-1; Wed, 02 Dec 2020 03:08:55 -0500 X-MC-Unique: mMFdmw89NDG2CmphFEDgZQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A360480364D for ; Wed, 2 Dec 2020 08:08:54 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6F6625D9C6 for ; Wed, 2 Dec 2020 08:08:54 +0000 (UTC) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 010/113] dma: Let dma_memory_read() propagate MemTxResult Date: Wed, 2 Dec 2020 03:07:06 -0500 Message-Id: <20201202080849.4125477-11-pbonzini@redhat.com> In-Reply-To: <20201202080849.4125477-1-pbonzini@redhat.com> References: <20201202080849.4125477-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.497, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Philippe Mathieu-Daudé dma_memory_rw_relaxed() returns a MemTxResult type. Do not discard it, return it to the caller. Reviewed-by: Richard Henderson Reviewed-by: Li Qiang Reviewed-by: Edgar E. Iglesias Signed-off-by: Philippe Mathieu-Daudé Message-Id: <20201023151923.3243652-7-philmd@redhat.com> Signed-off-by: Paolo Bonzini --- include/sysemu/dma.h | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h index 04687d8825..df170047eb 100644 --- a/include/sysemu/dma.h +++ b/include/sysemu/dma.h @@ -89,8 +89,9 @@ static inline MemTxResult dma_memory_rw_relaxed(AddressSpace *as, buf, len, dir == DMA_DIRECTION_FROM_DEVICE); } -static inline int dma_memory_read_relaxed(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len) +static inline MemTxResult dma_memory_read_relaxed(AddressSpace *as, + dma_addr_t addr, + void *buf, dma_addr_t len) { return dma_memory_rw_relaxed(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE); } @@ -124,8 +125,20 @@ static inline MemTxResult dma_memory_rw(AddressSpace *as, dma_addr_t addr, return dma_memory_rw_relaxed(as, addr, buf, len, dir); } -static inline int dma_memory_read(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len) +/** + * dma_memory_read: Read from an address space from DMA controller. + * + * Return a MemTxResult indicating whether the operation succeeded + * or failed (eg unassigned memory, device rejected the transaction, + * IOMMU fault). Called within RCU critical section. + * + * @as: #AddressSpace to be accessed + * @addr: address within that address space + * @buf: buffer with the data transferred + * @len: length of the data transferred + */ +static inline MemTxResult dma_memory_read(AddressSpace *as, dma_addr_t addr, + void *buf, dma_addr_t len) { return dma_memory_rw(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE); }