From patchwork Fri Jan 10 06:16:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 11326719 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 46B6918B8 for ; Fri, 10 Jan 2020 06:18:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2280D2073A for ; Fri, 10 Jan 2020 06:18:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578637110; bh=CXnjOYm1iTDjojjdsIRWTNlwicfcXj4LVXbnFJeFR2o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MxjdUxEf2Kc5weMDHigkZgVLfcDihb8QMWzpZiqgSYGlWGeFvMlBCS066ES8xIYeO NZRF/zzDxQ/UDIHxQkBW7kifblEp3hLNaDlg1nb1Thbz31G1UsFXpnmtLYzJZRZFe7 5CmuHEAJKhzw44DTcFKyrLMUBupnOJeMRBSijtwc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731470AbgAJGS3 (ORCPT ); Fri, 10 Jan 2020 01:18:29 -0500 Received: from mail.kernel.org ([198.145.29.99]:52848 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731465AbgAJGS2 (ORCPT ); Fri, 10 Jan 2020 01:18:28 -0500 Received: from sol.localdomain (c-24-5-143-220.hsd1.ca.comcast.net [24.5.143.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B88D920838; Fri, 10 Jan 2020 06:18:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578637107; bh=CXnjOYm1iTDjojjdsIRWTNlwicfcXj4LVXbnFJeFR2o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kmb0Iyc9tu/rxA/ezfektn4+xbD8O/KI0wSPSI6WPESopr4jFdCCoLqlj1ssipQ5D +iQVFzbMgld/0e+uZf4U7ONdoaINq/8u9n4qsttx1wep3Uh8KjmwhNTZjkGT7vDQnu A0jG1DmClF5SdOEZwAkqU5xwfK8UYIRoFfhHwLmw= From: Eric Biggers To: linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org Cc: linux-block@vger.kernel.org, linux-fscrypt@vger.kernel.org, Andy Gross , Bjorn Andersson , Alim Akhtar , Avri Altman , Pedro Sousa , John Stultz , Barani Muthukumaran , Can Guo , Satya Tangirala , Jaegeuk Kim , "Theodore Y . Ts'o" Subject: [RFC PATCH 4/5] scsi: ufs: add program_key() variant op Date: Thu, 9 Jan 2020 22:16:33 -0800 Message-Id: <20200110061634.46742-5-ebiggers@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200110061634.46742-1-ebiggers@kernel.org> References: <20200110061634.46742-1-ebiggers@kernel.org> MIME-Version: 1.0 Sender: linux-fscrypt-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org From: Eric Biggers On Snapdragon SoCs, the Linux kernel isn't permitted to directly access the standard UFS crypto configuration registers. Instead, programming and evicting keys must be done through vendor-specific SMC calls. To support this hardware, add a ->program_key() method to 'struct ufs_hba_variant_ops'. This allows overriding the UFS standard key programming procedure. Signed-off-by: Eric Biggers --- drivers/scsi/ufs/ufshcd-crypto.c | 24 ++++++++++++++++++------ drivers/scsi/ufs/ufshcd.h | 5 +++++ 2 files changed, 23 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd-crypto.c b/drivers/scsi/ufs/ufshcd-crypto.c index 2c34beb47f8e0..4b9e4d5770643 100644 --- a/drivers/scsi/ufs/ufshcd-crypto.c +++ b/drivers/scsi/ufs/ufshcd-crypto.c @@ -117,15 +117,21 @@ static int ufshcd_crypto_cfg_entry_write_key(union ufs_crypto_cfg_entry *cfg, return -EINVAL; } -static void ufshcd_program_key(struct ufs_hba *hba, - const union ufs_crypto_cfg_entry *cfg, - int slot) +static int ufshcd_program_key(struct ufs_hba *hba, + const union ufs_crypto_cfg_entry *cfg, int slot) { int i; u32 slot_offset = hba->crypto_cfg_register + slot * sizeof(*cfg); + int err; pm_runtime_get_sync(hba->dev); ufshcd_hold(hba, false); + + if (hba->vops->program_key) { + err = hba->vops->program_key(hba, cfg, slot); + goto out; + } + /* Clear the dword 16 */ ufshcd_writel(hba, 0, slot_offset + 16 * sizeof(cfg->reg_val[0])); /* Ensure that CFGE is cleared before programming the key */ @@ -145,15 +151,20 @@ static void ufshcd_program_key(struct ufs_hba *hba, ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[16]), slot_offset + 16 * sizeof(cfg->reg_val[0])); wmb(); + err = 0; +out: ufshcd_release(hba); pm_runtime_put_sync(hba->dev); + return err; } static void ufshcd_clear_keyslot(struct ufs_hba *hba, int slot) { union ufs_crypto_cfg_entry cfg = { 0 }; + int err; - ufshcd_program_key(hba, &cfg, slot); + err = ufshcd_program_key(hba, &cfg, slot); + WARN_ON_ONCE(err); } /* Clear all keyslots at driver init time */ @@ -198,10 +209,11 @@ static int ufshcd_crypto_keyslot_program(struct keyslot_manager *ksm, if (err) return err; - ufshcd_program_key(hba, &cfg, slot); + err = ufshcd_program_key(hba, &cfg, slot); memzero_explicit(&cfg, sizeof(cfg)); - return 0; + + return err; } static int ufshcd_crypto_keyslot_evict(struct keyslot_manager *ksm, diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index b6f0d08a98a8b..cd0969b93d070 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -280,6 +280,8 @@ struct ufs_pwr_mode_info { struct ufs_pa_layer_attr info; }; +union ufs_crypto_cfg_entry; + /** * struct ufs_hba_variant_ops - variant specific callbacks * @name: variant name @@ -307,6 +309,7 @@ struct ufs_pwr_mode_info { * @dbg_register_dump: used to dump controller debug information * @phy_initialization: used to initialize phys * @device_reset: called to issue a reset pulse on the UFS device + * @program_key: program an inline encryption key into a keyslot */ struct ufs_hba_variant_ops { const char *name; @@ -336,6 +339,8 @@ struct ufs_hba_variant_ops { void (*dbg_register_dump)(struct ufs_hba *hba); int (*phy_initialization)(struct ufs_hba *); void (*device_reset)(struct ufs_hba *hba); + int (*program_key)(struct ufs_hba *hba, + const union ufs_crypto_cfg_entry *cfg, int slot); }; /* clock gating state */