From nobody Fri Dec 19 08:06:32 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 9E42AE71D40 for ; Fri, 29 Sep 2023 15:03:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233497AbjI2PDd (ORCPT ); Fri, 29 Sep 2023 11:03:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44864 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233363AbjI2PDZ (ORCPT ); Fri, 29 Sep 2023 11:03:25 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B36C71A7 for ; Fri, 29 Sep 2023 08:03:19 -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 D3831106F; Fri, 29 Sep 2023 08:03:57 -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 7CBCE3F5A1; Fri, 29 Sep 2023 08:03:18 -0700 (PDT) From: Sudeep Holla Date: Fri, 29 Sep 2023 16:02:53 +0100 Subject: [PATCH v3 04/17] firmware: arm_ffa: Implement the FFA_RUN interface MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230929-ffa_v1-1_notif-v3-4-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=2472; i=sudeep.holla@arm.com; h=from:subject:message-id; bh=3/hdIfSwI04CJ8YoVOAM5D8uyI/IOxahGfihf3h43bU=; b=owEBbQKS/ZANAwAIAQBBurwxfuKYAcsmYgBlFucuyb+IhwHkIr8NkHq2LIo7vVzNfZRZsmBWR 4z6tmAq9BKJAjMEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZRbnLgAKCRAAQbq8MX7i mG9sD/908ogrCGeAYlAX2T65/u61ZJ7us0nLl5Uheh/+02XbBaRhe5MTBlWCuxDsgwR+evhSYU3 NwZ+qXzILP+4auBk2iAlAxfSh9tGliHl2UOOCsb8ovJaLgagrw0zXJyYJkwz5OPshhY5EkfMnt3 ffwMTulCVOv6iLyGnghUQsyxGZOff5IMuGouns2vqnmEW4CmLqDkBo1X/vnXefbZlt2Lz9eSAjO RuVdrdEZoB90GM2q/FCns3FFtmg/pb59uh4paZ8+kaoyQ+sB5GoZXg+Q17bbTlar9Ypm9Sp5Rui R8wcjmq7I58eIXNWwCbz6jVY1nw3X46H5JOEPXZElh57O7PajQLrJLV4pQwgXQH6PMaNwmd4d3l iJf+UbzPbDEo7JkBz+43MWhMEXGZwsQDAmOUXF0n/TQUBsqpLHHGZqbr42FJqoXo6qrjXO5fnNV m5rk4WRCOgmCzRZnE1ewRI1Oxdg+3QoUplO43iTFP3tZjUADnTQl8mQ8mpP0byodrXWaRIRSI0A P0Zl2+qvKUG9qZjgnrBGdRVJ7HoFU821Z2ZQ+KqxQNbHF3Xe5Y4yHN9gYn3sNukQx0PWQ8tSQuI BukTyIlcNQBrrUg3Loqo+XFukGt5Nlcco2QOziTsxJfSh8kWllWq4qle1u1bIHS2p6Gxbeg38LN W/D92epURHxVZ2g== X-Developer-Key: i=sudeep.holla@arm.com; a=openpgp; fpr=7360A21742ADF5A11767C1C139CFD4755FE2D5B4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org FFA_RUN is used by a scheduler to allocate CPU cycles to a target endpoint execution context specified in the target information parameter. If the endpoint execution context is in the waiting/blocked state, it transitions to the running state. Expose the ability to call FFA_RUN in order to give any partition in the system cpu cycles to perform IMPDEF functionality. Signed-off-by: Sudeep Holla --- drivers/firmware/arm_ffa/driver.c | 22 ++++++++++++++++++++++ include/linux/arm_ffa.h | 5 +++++ 2 files changed, 27 insertions(+) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/d= river.c index 26bf9c4e3b5f..b265063e76ea 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -616,6 +616,23 @@ static int ffa_notification_bind_common(u16 dst_id, u6= 4 bitmap, return 0; } =20 +static int ffa_run(struct ffa_device *dev, u16 vcpu) +{ + ffa_value_t ret; + u32 target =3D dev->vm_id << 16 | vcpu; + + invoke_ffa_fn((ffa_value_t){ .a0 =3D FFA_RUN, .a1 =3D target, }, &ret); + + while (ret.a0 =3D=3D FFA_INTERRUPT) + invoke_ffa_fn((ffa_value_t){ .a0 =3D FFA_RUN, .a1 =3D ret.a1, }, + &ret); + + if (ret.a0 =3D=3D FFA_ERROR) + return ffa_to_linux_errno((int)ret.a2); + + return 0; +} + static void ffa_set_up_mem_ops_native_flag(void) { if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) || @@ -708,10 +725,15 @@ static const struct ffa_mem_ops ffa_drv_mem_ops =3D { .memory_lend =3D ffa_memory_lend, }; =20 +static const struct ffa_cpu_ops ffa_drv_cpu_ops =3D { + .run =3D ffa_run, +}; + static const struct ffa_ops ffa_drv_ops =3D { .info_ops =3D &ffa_drv_info_ops, .msg_ops =3D &ffa_drv_msg_ops, .mem_ops =3D &ffa_drv_mem_ops, + .cpu_ops =3D &ffa_drv_cpu_ops, }; =20 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid) diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h index 2ea1717a0825..12fd134bf670 100644 --- a/include/linux/arm_ffa.h +++ b/include/linux/arm_ffa.h @@ -387,10 +387,15 @@ struct ffa_mem_ops { int (*memory_lend)(struct ffa_mem_ops_args *args); }; =20 +struct ffa_cpu_ops { + int (*run)(struct ffa_device *dev, u16 vcpu); +}; + struct ffa_ops { const struct ffa_info_ops *info_ops; const struct ffa_msg_ops *msg_ops; const struct ffa_mem_ops *mem_ops; + const struct ffa_cpu_ops *cpu_ops; }; =20 #endif /* _LINUX_ARM_FFA_H */ --=20 2.42.0