From patchwork Fri Sep 29 15:02:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 13404515 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 791BFE71D47 for ; Fri, 29 Sep 2023 15:04:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:To:In-Reply-To:References:Message-Id: MIME-Version:Subject:Date:From:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=eJYAxLXWDvjAg+/exX8StGzIXWGhVwb28ZYkvVD4qKc=; b=PFXEbJCSNK85dv xYTiFbGWBGVYzzKFIICWBCADNIbnjXnVGYEIhYAqKiehL9XwAoJwFj7k5hgQxiRt1XslDlzssgpDU 0MzLOa124+RROteq/Knjj601HiddPeTAh0MoiSAAC1unxRO8N6y1JyKtkEDsVK1x/txiTB4LGqUkr SlXOpOLOKSZwdo1njPqxYjibY79x3bjn5YkAiAS6BvMQbilaN7/Tp6gwKKtGxcuWq7vmn4Zc68LfF nsktQgtfal8A2MS/rtZZKVvSeHp+wKRYwYNjThPb3/clIYwWR6gYKtk7tAhmZAVenXBSdxpnfpiR7 N92X1j1bUUeutbX5qtgQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qmF1n-0088PA-0g; Fri, 29 Sep 2023 15:03:39 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qmF1X-0088E3-1E for linux-arm-kernel@lists.infradead.org; Fri, 29 Sep 2023 15:03:26 +0000 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 66FB11FB; Fri, 29 Sep 2023 08:04:01 -0700 (PDT) Received: from e103737-lin.cambridge.arm.com (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 103C33F5A1; Fri, 29 Sep 2023 08:03:21 -0700 (PDT) From: Sudeep Holla Date: Fri, 29 Sep 2023 16:02:56 +0100 Subject: [PATCH v3 07/17] firmware: arm_ffa: Implement the NOTIFICATION_INFO_GET interface MIME-Version: 1.0 Message-Id: <20230929-ffa_v1-1_notif-v3-7-c8e4f15190c8@arm.com> References: <20230929-ffa_v1-1_notif-v3-0-c8e4f15190c8@arm.com> In-Reply-To: <20230929-ffa_v1-1_notif-v3-0-c8e4f15190c8@arm.com> To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sudeep Holla , Marc Bonnici , Jens Wiklander , Coboy Chen , Lorenzo Pieralisi , Olivier Deprez X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3494; i=sudeep.holla@arm.com; h=from:subject:message-id; bh=dQUQF6aKVXxeLM41f9K20i0Yq+P0jCynjIfIlm9Bp8g=; b=owEBbQKS/ZANAwAIAQBBurwxfuKYAcsmYgBlFucve2qtLbbccIMHbNg0cUf8hiyVYCCGIRU/s AUdAu0DaQyJAjMEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZRbnLwAKCRAAQbq8MX7i mL5mEACznJSiwoQJn1cxlk6mI1vNela97vgqL1j821bBPau8I9q9uEkahsMEkK8ZMejEntkD1c2 JgdvOhL3f13iNoysjiebYplIRPJF36hgRQ9fdwsv+bVL95NtRcoliH8dNvPY1ftgpuk7m/cfZbT /Yb1wzb4hklyhzCb4XW144DqTaElVUsaeTRoIIKZCWPnwXNuWgVmB2/xHfBm91m0SDz9o6w3ZD6 8IHsknrXCp5Y1ETDm9EvfTVzHgx3N8MWbBx4ijgUrIHhpLpMtpw+ooJa4Jnl2/Dnq01WUODNcVS ZjTLOkkE1gEBGjZAlrgXm8woWgAMdyjlXMlYaOl2LUmHmSGx6xKigCLvtdQoJ8cVobgY5PzlyTo VXaoLW5r6mIzMe1mOcbcJIddUTm0+a+GFyASb1ob+fCnjemXUlmMx+re2lIzi0La+Z1WLSQlgTj fpXAdk74k0xCEjY7oVPlB4Kbn4hgRatx7Fr6QGuif6dNdZq9B91nK4dJxjwQUXP6ylWlPJ35/6Y W+FopXFpC9zYyOPxlCPPTWu3bTrAad4gbFUFWjg5i7LZqcQeRUmMZYDY/CAATfRwHwfy9ncUvPP wjAcBOYAbLC4+vNjcV08PNxX9UH8ExHo6oYxxvsppBx5xWaVUfiCl8FZ1cHfiZ94R8/zX9pnI9b oqr4LayRyO3Zs6g== X-Developer-Key: i=sudeep.holla@arm.com; a=openpgp; fpr=7360A21742ADF5A11767C1C139CFD4755FE2D5B4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230929_080323_511291_E5A0A86C X-CRM114-Status: GOOD ( 12.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The receiver’s scheduler uses the FFA_NOTIFICATION_INFO_GET interface to retrieve the list of endpoints that have pending notifications and must be run. A notification could be signaled by a sender in the secure world to a VM. The Hypervisor needs to determine which VM and vCPU (in case a per-vCPU notification is signaled) has a pending notification in this scenario. It must obtain this information through an invocation of the FFA_NOTIFICATION_INFO_GET. Add the implementation of the NOTIFICATION_INFO_GET interface and prepare to use this to handle the schedule receiver interrupt. Implementation of handling notifications will be added later. Signed-off-by: Sudeep Holla --- drivers/firmware/arm_ffa/driver.c | 70 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c index 02eedb7bc171..dfeeb751bebe 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -602,6 +602,13 @@ static int ffa_notification_bitmap_destroy(void) (FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \ FIELD_PREP(RECEIVER_ID_MASK, (r))) +#define NOTIFICATION_INFO_GET_MORE_PEND_MASK BIT(0) +#define NOTIFICATION_INFO_GET_ID_COUNT GENMASK(11, 7) +#define ID_LIST_MASK_64 GENMASK(51, 12) +#define ID_LIST_MASK_32 GENMASK(31, 12) +#define MAX_IDS_64 20 +#define MAX_IDS_32 10 + static int ffa_notification_bind_common(u16 dst_id, u64 bitmap, u32 flags, bool is_bind) { @@ -673,6 +680,69 @@ static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify) return 0; } +static void __do_sched_recv_cb(u16 partition_id, u16 vcpu, bool is_per_vcpu) +{ + pr_err("Callback for partition 0x%x failed.\n", partition_id); +} + +static void ffa_notification_info_get(bool is_64b) +{ + int idx, list, max_ids, lists_cnt, ids_processed, ids_count[MAX_IDS_64]; + ffa_value_t ret; + u64 id_list; + + do { + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET), + }, &ret); + + if (ret.a0 != FFA_FN_NATIVE(SUCCESS)) { + if (ret.a2 != FFA_RET_NO_DATA) + pr_err("Notification Info fetch failed: 0x%lx (0x%lx)", + ret.a0, ret.a2); + return; + } + + ids_processed = 0; + lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2); + if (is_64b) { + max_ids = MAX_IDS_64; + id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2); + } else { + max_ids = MAX_IDS_32; + id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2); + } + + for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2) + ids_count[idx] = (id_list & 0x3) + 1; + + /* Process IDs */ + for (list = 0; list < lists_cnt; list++) { + u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3; + + if (ids_processed >= max_ids - 1) + break; + + part_id = packed_id_list[++ids_processed]; + + if (!ids_count[list]) { /* Global Notification */ + __do_sched_recv_cb(part_id, 0, false); + continue; + } + + /* Per vCPU Notification */ + for (idx = 0; idx < ids_count[list]; idx++) { + if (ids_processed >= max_ids - 1) + break; + + vcpu_id = packed_id_list[++ids_processed]; + + __do_sched_recv_cb(part_id, vcpu_id, true); + } + } + } while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK); +} + static int ffa_run(struct ffa_device *dev, u16 vcpu) { ffa_value_t ret;