From patchwork Tue Jan 25 00:10:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 536700 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 B1CA6C4707A for ; Tue, 25 Jan 2022 00:30:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S3409264AbiAYAZS (ORCPT ); Mon, 24 Jan 2022 19:25:18 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:52156 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2374377AbiAYAQw (ORCPT ); Mon, 24 Jan 2022 19:16:52 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8D33B61541 for ; Tue, 25 Jan 2022 00:16:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E70CC340E5; Tue, 25 Jan 2022 00:16:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643069812; bh=9LPfnNjILhCHVOzA/ALZlaZgBfzu64ZFSV1uulmc3Ng=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lvcznT6zBbCxamgRcSCeyf0gZJ+1LiJpHzHcf34mueCAKaVUYQiBe5By+kOnn/798 NidUKWACOwPA25mRnA+AvGertaQ1FMEv473tCyUjzxzn5B5XPKD9Ci7YZMaVXCDGpV jgDJp8X4fumqZXGhrKGbRZTd6gmhv3yjPB7iFLQE2md0rt8nUcd9bqtpO9MX/4bV3h xB0p9UKenSaznv6zlGexumbVsynsPBCosLici8jFZlih1z3oG843bo8KPzknWSPN4S rEwT/jfXi0+12K6RaAFxFrKJcY9xe1WdzG4XLduZn0V3KaQG8qS+zqUsAXUjhPhojo GmfJpf0aYpJ4A== From: Mark Brown To: Catalin Marinas , Will Deacon , Marc Zyngier , Shuah Khan , Shuah Khan Cc: Alan Hayward , Luis Machado , Salil Akerkar , Basant Kumar Dwivedi , Szabolcs Nagy , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Mark Brown Subject: [PATCH v8 23/38] arm64/sme: Save and restore streaming mode over EFI runtime calls Date: Tue, 25 Jan 2022 00:10:59 +0000 Message-Id: <20220125001114.193425-24-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220125001114.193425-1-broonie@kernel.org> References: <20220125001114.193425-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3623; h=from:subject; bh=9LPfnNjILhCHVOzA/ALZlaZgBfzu64ZFSV1uulmc3Ng=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBh70AT+1rMeb1w4VGXA4pCLW80Hj1ML4fkGBbtIMNG NJ0XdkiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYe9AEwAKCRAk1otyXVSH0MaWCA CBJCpOj/6iO2EkpkbDnUOOfkT39Me12e/hR36c8YTD7GvkzTQhxAKnv1PYi+tuKfnOBzkLUVLQrUgE iDlC2Kml3NnPjDOFtRDolD+3i6Lej2v6SjErhjbWYNI/k3zIBqqlguvyxbx2K1SiEz2MUKoA1IN4X+ HWXX+AoV+LoD3IniJ6d0EkO6Uef3Yr1cXy3QSzCpsZMwJ0tHdF5tpBykNFZNAYJGwutGq0OaPrvz4/ l1uIofL0yjgLaUuKs+HpQk0AQtzIe7jn/ZYWoJtGKia8yEgmTVNuZo8sT6HYT3yvrnUFDlZ90vol1E 5gGIhg9VVRq1ha/2b1jPIKb5/on5EB X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org When saving and restoring the floating point state over an EFI runtime call ensure that we handle streaming mode, only handling FFR if we are not in streaming mode and ensuring that we are in normal mode over the call into runtime services. We currently assume that ZA will not be modified by runtime services, the specification is not yet finalised so this may need updating if that changes. Signed-off-by: Mark Brown --- arch/arm64/kernel/fpsimd.c | 47 +++++++++++++++++++++++++++++++++----- 1 file changed, 41 insertions(+), 6 deletions(-) diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index e00d3a9e919c..a7077a5d1ed2 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1059,21 +1059,25 @@ int vec_verify_vq_map(enum vec_type type) static void __init sve_efi_setup(void) { - struct vl_info *info = &vl_info[ARM64_VEC_SVE]; + int max_vl = 0; + int i; if (!IS_ENABLED(CONFIG_EFI)) return; + for (i = 0; i < ARRAY_SIZE(vl_info); i++) + max_vl = max(vl_info[i].max_vl, max_vl); + /* * alloc_percpu() warns and prints a backtrace if this goes wrong. * This is evidence of a crippled system and we are returning void, * so no attempt is made to handle this situation here. */ - if (!sve_vl_valid(info->max_vl)) + if (!sve_vl_valid(max_vl)) goto fail; efi_sve_state = __alloc_percpu( - SVE_SIG_REGS_SIZE(sve_vq_from_vl(info->max_vl)), SVE_VQ_BYTES); + SVE_SIG_REGS_SIZE(sve_vq_from_vl(max_vl)), SVE_VQ_BYTES); if (!efi_sve_state) goto fail; @@ -1848,6 +1852,7 @@ EXPORT_SYMBOL(kernel_neon_end); static DEFINE_PER_CPU(struct user_fpsimd_state, efi_fpsimd_state); static DEFINE_PER_CPU(bool, efi_fpsimd_state_used); static DEFINE_PER_CPU(bool, efi_sve_state_used); +static DEFINE_PER_CPU(bool, efi_sm_state); /* * EFI runtime services support functions @@ -1882,12 +1887,28 @@ void __efi_fpsimd_begin(void) */ if (system_supports_sve() && likely(efi_sve_state)) { char *sve_state = this_cpu_ptr(efi_sve_state); + bool ffr = true; + u64 svcr; __this_cpu_write(efi_sve_state_used, true); + /* If we are in streaming mode don't touch FFR */ + if (system_supports_sme()) { + svcr = read_sysreg_s(SYS_SVCR_EL0); + + ffr = svcr & SYS_SVCR_EL0_SM_MASK; + + __this_cpu_write(efi_sm_state, ffr); + } + sve_save_state(sve_state + sve_ffr_offset(sve_max_vl()), &this_cpu_ptr(&efi_fpsimd_state)->fpsr, - true); + ffr); + + if (system_supports_sme()) + sysreg_clear_set_s(SYS_SVCR_EL0, + SYS_SVCR_EL0_SM_MASK, 0); + } else { fpsimd_save_state(this_cpu_ptr(&efi_fpsimd_state)); } @@ -1910,11 +1931,25 @@ void __efi_fpsimd_end(void) if (system_supports_sve() && likely(__this_cpu_read(efi_sve_state_used))) { char const *sve_state = this_cpu_ptr(efi_sve_state); + bool ffr = true; + + /* + * Restore streaming mode; EFI calls are + * normal function calls so should not return in + * streaming mode. + */ + if (system_supports_sme()) { + if (__this_cpu_read(efi_sm_state)) { + sysreg_clear_set_s(SYS_SVCR_EL0, + 0, + SYS_SVCR_EL0_SM_MASK); + ffr = false; + } + } - sve_set_vq(sve_vq_from_vl(sve_get_vl()) - 1); sve_load_state(sve_state + sve_ffr_offset(sve_max_vl()), &this_cpu_ptr(&efi_fpsimd_state)->fpsr, - true); + ffr); __this_cpu_write(efi_sve_state_used, false); } else {