From nobody Fri Nov 29 19:38:50 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1632328486749605.0079414158204; Wed, 22 Sep 2021 09:34:46 -0700 (PDT) Received: from localhost ([::1]:55878 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mT5Cn-0002Vi-Ic for importer@patchew.org; Wed, 22 Sep 2021 12:34:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44746) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mT4uz-0003Ey-C1; Wed, 22 Sep 2021 12:16:21 -0400 Received: from beetle.greensocs.com ([5.135.226.135]:39170) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mT4ux-0005Ow-JW; Wed, 22 Sep 2021 12:16:21 -0400 Received: from crumble.bar.greensocs.com (unknown [172.17.10.6]) by beetle.greensocs.com (Postfix) with ESMTPS id 3C58E21ECD; Wed, 22 Sep 2021 16:15:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=greensocs.com; s=mail; t=1632327356; h=from:from:reply-to:subject:subject: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=83vzCH47KASlUcuFQINQpuff64c+MWa6MS19Qg8Yxnk=; b=P7hcyu+pxVIWKnhY3fU1nC0/ApGUVDeZbSeiHxcpgkCZWg35zWms2xJ3anjKnSVUoSAD8c H+qh2umF75EUBiBBC7qMvIrQtuaCSddKC0OjRXsV4MQS+CTdyIeI2BmpDSKe3DXTKRIt0Q VCthFEhyqAq/QRJQzHUCvH2QWSOp70s= From: Damien Hedde To: qemu-devel@nongnu.org Subject: [RFC PATCH v2 11/16] softmmu/memory: add memory_region_try_add_subregion function Date: Wed, 22 Sep 2021 18:14:00 +0200 Message-Id: <20210922161405.140018-12-damien.hedde@greensocs.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210922161405.140018-1-damien.hedde@greensocs.com> References: <20210922161405.140018-1-damien.hedde@greensocs.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam: Yes Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=5.135.226.135; envelope-from=damien.hedde@greensocs.com; helo=beetle.greensocs.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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: , Cc: Peter Maydell , "Michael S. Tsirkin" , David Hildenbrand , Peter Xu , mirela.grujic@greensocs.com, Alistair Francis , Gerd Hoffmann , Ani Sinha , Eric Blake , Stefano Stabellini , xen-devel@lists.xenproject.org, Paul Durrant , Markus Armbruster , Anthony Perard , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Eduardo Habkost , "Dr. David Alan Gilbert" , Eric Auger , Paolo Bonzini , qemu-riscv@nongnu.org, Damien Hedde , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , mark.burton@greensocs.com, edgari@xilinx.com, Igor Mammedov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1632328487845100003 Content-Type: text/plain; charset="utf-8" It allows to try to add a subregion to a memory region with error handling. Like memory_region_add_subregion_overlap, it handles priority as well. Apart the error handling, the behavior is the same. It can be used to do the simple memory_region_add_subregion() (with no overlap) by setting the priority parameter to 0. This commit is a preparation to further use this function in the context of qmp command which needs error handling support. Signed-off-by: Damien Hedde Reviewed-by: Alistair Francis Reviewed-by: David Hildenbrand Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- Adding a new function is obviously not ideal. But there is ~900 occurrences of memory_region_add_subregion[_overlap] calls in the code base. We do not really see an alternative here. --- include/exec/memory.h | 22 ++++++++++++++++++++++ softmmu/memory.c | 22 ++++++++++++++-------- 2 files changed, 36 insertions(+), 8 deletions(-) diff --git a/include/exec/memory.h b/include/exec/memory.h index c3d417d317..422e1eda67 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2162,6 +2162,28 @@ void memory_region_add_subregion_overlap(MemoryRegio= n *mr, MemoryRegion *subregion, int priority); =20 +/** + * memory_region_try_add_subregion: Add a subregion to a container + * with error handling. + * + * Behaves like memory_region_add_subregion_overlap(), but errors are + * reported if the subregion cannot be added. + * + * @mr: the region to contain the new subregion; must be a container + * initialized with memory_region_init(). + * @offset: the offset relative to @mr where @subregion is added. + * @subregion: the subregion to be added. + * @priority: used for resolving overlaps; highest priority wins. + * @errp: pointer to Error*, to store an error if it happens. + * + * Returns: True in case of success, false otherwise. + */ +bool memory_region_try_add_subregion(MemoryRegion *mr, + hwaddr offset, + MemoryRegion *subregion, + int priority, + Error **errp); + /** * memory_region_get_ram_addr: Get the ram address associated with a memory * region diff --git a/softmmu/memory.c b/softmmu/memory.c index bfedaf9c4d..eac61f8236 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -2513,22 +2513,28 @@ done: memory_region_transaction_commit(); } =20 -static void memory_region_add_subregion_common(MemoryRegion *mr, - hwaddr offset, - MemoryRegion *subregion) +bool memory_region_try_add_subregion(MemoryRegion *mr, + hwaddr offset, + MemoryRegion *subregion, + int priority, + Error **errp) { - assert(!subregion->container); + if (subregion->container) { + error_setg(errp, "The memory region is already in another region"); + return false; + } + subregion->priority =3D priority; subregion->container =3D mr; subregion->addr =3D offset; memory_region_update_container_subregions(subregion); + return true; } =20 void memory_region_add_subregion(MemoryRegion *mr, hwaddr offset, MemoryRegion *subregion) { - subregion->priority =3D 0; - memory_region_add_subregion_common(mr, offset, subregion); + memory_region_try_add_subregion(mr, offset, subregion, 0, &error_abort= ); } =20 void memory_region_add_subregion_overlap(MemoryRegion *mr, @@ -2536,8 +2542,8 @@ void memory_region_add_subregion_overlap(MemoryRegion= *mr, MemoryRegion *subregion, int priority) { - subregion->priority =3D priority; - memory_region_add_subregion_common(mr, offset, subregion); + memory_region_try_add_subregion(mr, offset, subregion, priority, + &error_abort); } =20 void memory_region_del_subregion(MemoryRegion *mr, --=20 2.33.0