From patchwork Wed Mar 4 06:49:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 11419415 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 EF32217E0 for ; Wed, 4 Mar 2020 06:50:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0A49217F4 for ; Wed, 4 Mar 2020 06:50:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583304616; bh=6bHnxuhMBRQZTkaKvHiy0J1a+Is311SFjl6unYWy58g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nDKHmeadlYG8ClsGAPHlNMfmR6PX2o0xMjCA4ttZlBw7bOerGtETKLdPvZixmOSJT aWvR6UpuHI3igyI8V0vUt7slrIDRIRHR+9z444VLlDYw2wQiLwFbEODdTLbFVlu6op MK/W+NdJhZfyRvIsy4AaAgoRD/X6ySEpv+bcCWOI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387510AbgCDGuQ (ORCPT ); Wed, 4 Mar 2020 01:50:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:56854 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387396AbgCDGuN (ORCPT ); Wed, 4 Mar 2020 01:50:13 -0500 Received: from sol.hsd1.ca.comcast.net (c-107-3-166-239.hsd1.ca.comcast.net [107.3.166.239]) (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 4DD0E21744; Wed, 4 Mar 2020 06:50:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583304612; bh=6bHnxuhMBRQZTkaKvHiy0J1a+Is311SFjl6unYWy58g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aHLf3otV+hdM+2gpwqBYvdjHULHxg2QaJTgdi2WfIDHQaP+8AqhKfp9nHFlwsr1xk 7yT7Kf2ofXOrHSwYMYdrNXO7Hp3y0p6J29ZLtrF4M2ZRl3EeEEWN9Sjo61D46GKnqJ i7j7jKyyTS3N5RtEHjiAtN8n+5LkngsTtlQHkC90= 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, Alim Akhtar , Andy Gross , Avri Altman , Barani Muthukumaran , Bjorn Andersson , Can Guo , Elliot Berman , Jaegeuk Kim Subject: [RFC PATCH v2 3/4] scsi: ufs: add program_key() variant op Date: Tue, 3 Mar 2020 22:49:41 -0800 Message-Id: <20200304064942.371978-4-ebiggers@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200304064942.371978-1-ebiggers@kernel.org> References: <20200304064942.371978-1-ebiggers@kernel.org> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@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 / eviction procedure. Signed-off-by: Eric Biggers Signed-off-by: Eric Biggers --- drivers/scsi/ufs/ufshcd-crypto.c | 34 +++++++++++++++++++++----------- drivers/scsi/ufs/ufshcd.h | 3 +++ 2 files changed, 25 insertions(+), 12 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd-crypto.c b/drivers/scsi/ufs/ufshcd-crypto.c index cd7ca50a1dd9..7c50d1d4f58c 100644 --- a/drivers/scsi/ufs/ufshcd-crypto.c +++ b/drivers/scsi/ufs/ufshcd-crypto.c @@ -131,14 +131,20 @@ 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 = 0; ufshcd_hold(hba, false); + + if (hba->vops && hba->vops->program_key) { + err = hba->vops->program_key(hba, cfg, slot); + goto out; + } + /* Ensure that CFGE is cleared before programming the key */ ufshcd_writel(hba, 0, slot_offset + 16 * sizeof(cfg->reg_val[0])); for (i = 0; i < 16; i++) { @@ -151,23 +157,28 @@ static void ufshcd_program_key(struct ufs_hba *hba, /* Dword 16 must be written last */ ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[16]), slot_offset + 16 * sizeof(cfg->reg_val[0])); +out: ufshcd_release(hba); + return err; } -static void ufshcd_clear_keyslot(struct ufs_hba *hba, int slot) +static int ufshcd_clear_keyslot(struct ufs_hba *hba, int slot) { union ufs_crypto_cfg_entry cfg = { 0 }; - ufshcd_program_key(hba, &cfg, slot); + return ufshcd_program_key(hba, &cfg, slot); } /* Clear all keyslots at driver init time */ static void ufshcd_clear_all_keyslots(struct ufs_hba *hba) { int slot; + int err; - for (slot = 0; slot < ufshcd_num_keyslots(hba); slot++) - ufshcd_clear_keyslot(hba, slot); + for (slot = 0; slot < ufshcd_num_keyslots(hba); slot++) { + err = ufshcd_clear_keyslot(hba, slot); + WARN_ON_ONCE(err); + } } static int ufshcd_crypto_keyslot_program(struct keyslot_manager *ksm, @@ -203,10 +214,11 @@ 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, @@ -223,9 +235,7 @@ static int ufshcd_crypto_keyslot_evict(struct keyslot_manager *ksm, * Clear the crypto cfg on the device. Clearing CFGE * might not be sufficient, so just clear the entire cfg. */ - ufshcd_clear_keyslot(hba, slot); - - return 0; + return ufshcd_clear_keyslot(hba, slot); } void ufshcd_crypto_enable(struct ufs_hba *hba) diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index c8f948aa5e3d..c2656575e24b 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -306,6 +306,7 @@ 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 or evict an inline encryption key */ struct ufs_hba_variant_ops { const char *name; @@ -335,6 +336,8 @@ 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 */