From patchwork Fri May 24 12:40:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Fancellu X-Patchwork-Id: 13673116 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 26159C25B7C for ; Fri, 24 May 2024 12:41:24 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.729482.1134661 (Exim 4.92) (envelope-from ) id 1sAUEV-0000OP-8Q; Fri, 24 May 2024 12:41:15 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 729482.1134661; Fri, 24 May 2024 12:41:15 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sAUEV-0000N3-3c; Fri, 24 May 2024 12:41:15 +0000 Received: by outflank-mailman (input) for mailman id 729482; Fri, 24 May 2024 12:41:13 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sAUET-00082M-C8 for xen-devel@lists.xenproject.org; Fri, 24 May 2024 12:41:13 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-sth1.inumbo.com (Halon) with ESMTP id e471831c-19ca-11ef-90a1-e314d9c70b13; Fri, 24 May 2024 14:41:08 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9716A1684; Fri, 24 May 2024 05:41:31 -0700 (PDT) Received: from e125770.cambridge.arm.com (e125770.arm.com [10.1.199.43]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A56513F641; Fri, 24 May 2024 05:41:06 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: e471831c-19ca-11ef-90a1-e314d9c70b13 From: Luca Fancellu To: xen-devel@lists.xenproject.org Cc: Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel , Volodymyr Babchuk Subject: [PATCH v4 2/7] xen/arm: Wrap shared memory mapping code in one function Date: Fri, 24 May 2024 13:40:50 +0100 Message-Id: <20240524124055.3871399-3-luca.fancellu@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240524124055.3871399-1-luca.fancellu@arm.com> References: <20240524124055.3871399-1-luca.fancellu@arm.com> MIME-Version: 1.0 Wrap the code and logic that is calling assign_shared_memory and map_regions_p2mt into a new function 'handle_shared_mem_bank', it will become useful later when the code will allow the user to don't pass the host physical address. Signed-off-by: Luca Fancellu Reviewed-by: Michal Orzel --- v3 changes: - check return value of dt_property_read_string, add R-by Michal v2 changes: - add blank line, move owner_dom_io computation inside handle_shared_mem_bank in order to reduce args count, remove not needed BUGON(). (Michal) --- xen/arch/arm/static-shmem.c | 86 +++++++++++++++++++++++-------------- 1 file changed, 53 insertions(+), 33 deletions(-) diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c index 0a1c327e90ea..c15a65130659 100644 --- a/xen/arch/arm/static-shmem.c +++ b/xen/arch/arm/static-shmem.c @@ -180,6 +180,53 @@ append_shm_bank_to_domain(struct kernel_info *kinfo, paddr_t start, return 0; } +static int __init handle_shared_mem_bank(struct domain *d, paddr_t gbase, + const char *role_str, + const struct membank *shm_bank) +{ + bool owner_dom_io = true; + paddr_t pbase, psize; + int ret; + + pbase = shm_bank->start; + psize = shm_bank->size; + + /* + * "role" property is optional and if it is defined explicitly, + * then the owner domain is not the default "dom_io" domain. + */ + if ( role_str != NULL ) + owner_dom_io = false; + + /* + * DOMID_IO is a fake domain and is not described in the Device-Tree. + * Therefore when the owner of the shared region is DOMID_IO, we will + * only find the borrowers. + */ + if ( (owner_dom_io && !is_shm_allocated_to_domio(pbase)) || + (!owner_dom_io && strcmp(role_str, "owner") == 0) ) + { + /* + * We found the first borrower of the region, the owner was not + * specified, so they should be assigned to dom_io. + */ + ret = assign_shared_memory(owner_dom_io ? dom_io : d, gbase, shm_bank); + if ( ret ) + return ret; + } + + if ( owner_dom_io || (strcmp(role_str, "borrower") == 0) ) + { + /* Set up P2M foreign mapping for borrower domain. */ + ret = map_regions_p2mt(d, _gfn(PFN_UP(gbase)), PFN_DOWN(psize), + _mfn(PFN_UP(pbase)), p2m_map_foreign_rw); + if ( ret ) + return ret; + } + + return 0; +} + int __init process_shm(struct domain *d, struct kernel_info *kinfo, const struct dt_device_node *node) { @@ -196,7 +243,6 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo, unsigned int i; const char *role_str; const char *shm_id; - bool owner_dom_io = true; if ( !dt_device_is_compatible(shm_node, "xen,domain-shared-memory-v1") ) continue; @@ -237,39 +283,13 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo, return -EINVAL; } - /* - * "role" property is optional and if it is defined explicitly, - * then the owner domain is not the default "dom_io" domain. - */ - if ( dt_property_read_string(shm_node, "role", &role_str) == 0 ) - owner_dom_io = false; + /* "role" property is optional */ + if ( dt_property_read_string(shm_node, "role", &role_str) != 0 ) + role_str = NULL; - /* - * DOMID_IO is a fake domain and is not described in the Device-Tree. - * Therefore when the owner of the shared region is DOMID_IO, we will - * only find the borrowers. - */ - if ( (owner_dom_io && !is_shm_allocated_to_domio(pbase)) || - (!owner_dom_io && strcmp(role_str, "owner") == 0) ) - { - /* - * We found the first borrower of the region, the owner was not - * specified, so they should be assigned to dom_io. - */ - ret = assign_shared_memory(owner_dom_io ? dom_io : d, gbase, - boot_shm_bank); - if ( ret ) - return ret; - } - - if ( owner_dom_io || (strcmp(role_str, "borrower") == 0) ) - { - /* Set up P2M foreign mapping for borrower domain. */ - ret = map_regions_p2mt(d, _gfn(PFN_UP(gbase)), PFN_DOWN(psize), - _mfn(PFN_UP(pbase)), p2m_map_foreign_rw); - if ( ret ) - return ret; - } + ret = handle_shared_mem_bank(d, gbase, role_str, boot_shm_bank); + if ( ret ) + return ret; /* * Record static shared memory region info for later setting