From nobody Thu Sep 11 15:04:37 2025 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 3E313C001DB for ; Thu, 3 Aug 2023 19:02:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231288AbjHCTCt (ORCPT ); Thu, 3 Aug 2023 15:02:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231928AbjHCTCf (ORCPT ); Thu, 3 Aug 2023 15:02:35 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 927E03A87 for ; Thu, 3 Aug 2023 12:02:31 -0700 (PDT) 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 44B2C1474; Thu, 3 Aug 2023 12:03:14 -0700 (PDT) Received: from usa.arm.com (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 2965F3F6C4; Thu, 3 Aug 2023 12:02:30 -0700 (PDT) From: Sudeep Holla To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Sudeep Holla , Jens Wiklander , Lucian Paul-Trifu , Marc Bonnici , Coboy Chen Subject: [PATCH RFT 07/12] firmware: arm_ffa: Implement the NOTIFICATION_INFO_GET interface Date: Thu, 3 Aug 2023 20:02:11 +0100 Message-ID: <20230803-ffa_v1-1_notif-v1-7-6613ff2b1f81@arm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230803-ffa_v1-1_notif-v1-0-6613ff2b1f81@arm.com> References: <20230803-ffa_v1-1_notif-v1-0-6613ff2b1f81@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=vUn1QvDYVuAhz5nSv8RI4UWRh34UK5ah39o6Vq2iky0=; b=owEBbQKS/ZANAwAIAQBBurwxfuKYAcsmYgBky/iNZpp/pP0MmrPVLW0ACWS8Vn6AitaczmJGu e5T+SQ/VKiJAjMEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZMv4jQAKCRAAQbq8MX7i mJW2EAC38Vo5Z1tQ4bEfw6f7VUZSfT0cHcJGkGSwlYQb3U5Gteiznl0Y6uFmwbzXyIIsQqe/o2C zVbod+Az8Id9lXe/reAqYZVMArZpcrpyWvI1CHYDLISP6T2RZVAyF9kfK5oEic5ClHE4z1wADYW 6b0Iklk3kxzZ4oUyGAMZQQ7TKyXeYsetslCQfwtgqbSfmyPB1r1EvmVaI1161M5hGoIp3so8aCj EUQvAZJF9gYU1Oz6geRVpCzz5TO2d4yHrMJGehIi8V+OvgJojtOVlTJOCrexja/lgjobNitIZAH 4hxiDhKH3n3Y4+Zz7M2njj4wVYXF1uLf9li9UkDWkQZCyb1htfUIuvOmGN/HJU+Fmc90IMI8wUI Y1RX9pAIXALtYm7sb5AP6lIr3enUlzhPSSO/iD9YKOot5fEdKMySvIWhrTHrzJCiqrc4C0BnnhR isPXyZCXyKeCsNzOtlLqkly7Ubd1u+Q03oQZMpwylUPJOnYoDcu1jKIOs1WWrcrIy3WqNd1PHjt C8TtyS+MmmOCPdHXIpuINrbVngxpS3X220B8uDbWqQqNtWLstuG/d9fJqOrOhb6bJOJR+4/QzJd HoDljVhBbCGHtgVkgpm/dKzLVEmjLoWMO1J9M/iXhT0UqItOpI+JtLNf9MAJZDpvOwZo1tZssXt agPiLtT+ NEDYTcA== X-Developer-Key: i=sudeep.holla@arm.com; a=openpgp; fpr=7360A21742ADF5A11767C1C139CFD4755FE2D5B4 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The receiver=E2=80=99s scheduler uses the FFA_NOTIFICATION_INFO_GET interfa= ce 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/d= river.c index 6cad91ee57eb..77ca9753e3f0 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -590,6 +590,13 @@ static int ffa_notification_bitmap_destroy(void) (FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \ FIELD_PREP(RECEIVER_ID_MASK, (r))) =20 +#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) { @@ -661,6 +668,69 @@ static int ffa_notification_get(u32 flags, struct ffa_= notify_bitmaps *notify) return 0; } =20 +static void __do_sched_recv_cb(u16 partition_id, u16 vcpu, bool is_per_vcp= u) +{ + 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 =3D FFA_FN_NATIVE(NOTIFICATION_INFO_GET), + }, &ret); + + if (ret.a0 !=3D FFA_FN_NATIVE(SUCCESS)) { + if (ret.a2 !=3D FFA_RET_NO_DATA) + pr_err("Notification Info fetch failed: 0x%lx (0x%lx)", + ret.a0, ret.a2); + return; + } + + ids_processed =3D 0; + lists_cnt =3D FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2); + if (is_64b) { + max_ids =3D MAX_IDS_64; + id_list =3D FIELD_GET(ID_LIST_MASK_64, ret.a2); + } else { + max_ids =3D MAX_IDS_32; + id_list =3D FIELD_GET(ID_LIST_MASK_32, ret.a2); + } + + for (idx =3D 0; idx < lists_cnt; idx++, id_list >>=3D 2) + ids_count[idx] =3D (id_list & 0x3) + 1; + + /* Process IDs */ + for (list =3D 0; list < lists_cnt; list++) { + u16 vcpu_id, part_id, *packed_id_list =3D (u16 *)&ret.a3; + + if (ids_processed >=3D max_ids - 1) + break; + + part_id =3D 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 =3D 0; idx < ids_count[list]; idx++) { + if (ids_processed >=3D max_ids - 1) + break; + + vcpu_id =3D 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; --=20 2.41.0