From patchwork Sun Jun 21 17:37:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 11616655 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 9049217D4 for ; Sun, 21 Jun 2020 17:41:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F92522254 for ; Sun, 21 Jun 2020 17:41:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592761263; bh=SWhjI7glEKSROW2UDnJHK47bgIRnXW8RaLVPD/IWjGc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ojurva93nmR6gekObFHz2jTyogCTIk8DH1FBqTybjAs582D2iQo4J16f37J7XYr// 6aZYb0oWGuVVw/omHGEpaUlyOe4qQ0/tkCZEFQShL2ZDkpbFY7wDUf7J6WS28jAXIo kcNY7YJNtAH17TfmoQjRm87THWIdXfmXfw0Olczc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730508AbgFURlB (ORCPT ); Sun, 21 Jun 2020 13:41:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:52472 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730471AbgFURlA (ORCPT ); Sun, 21 Jun 2020 13:41:00 -0400 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 3D3B42242C; Sun, 21 Jun 2020 17:41:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592761260; bh=SWhjI7glEKSROW2UDnJHK47bgIRnXW8RaLVPD/IWjGc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E0wbYiytpXV7bYQAoMypaXeGMeB3FZBCNimyjajaSga9gcT3hJTAfSmBKXZRAKpIL ctkIMOHlKrq1aOANbUp9IC/d1FBXVenrBbFQgHINzK6oFf7EULNUWrCzLrYkdAwspG WK3f8EDTQtSQBBSv13Fu+jIKWJyx5Tm2AaTWJkKU= From: Eric Biggers To: linux-scsi@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, linux-fscrypt@vger.kernel.org, Alim Akhtar , Andy Gross , Avri Altman , Barani Muthukumaran , Bjorn Andersson , Can Guo , Elliot Berman , John Stultz , Satya Tangirala , Steev Klimaszewski , Thara Gopinath Subject: [PATCH v5 4/5] scsi: ufs: add program_key() variant op Date: Sun, 21 Jun 2020 10:37:12 -0700 Message-Id: <20200621173713.132879-5-ebiggers@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200621173713.132879-1-ebiggers@kernel.org> References: <20200621173713.132879-1-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 / eviction procedure. Signed-off-by: Eric Biggers --- drivers/scsi/ufs/ufshcd-crypto.c | 27 +++++++++++++++++---------- drivers/scsi/ufs/ufshcd.h | 3 +++ 2 files changed, 20 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd-crypto.c b/drivers/scsi/ufs/ufshcd-crypto.c index 65a3115d2a2d..717a7eb62988 100644 --- a/drivers/scsi/ufs/ufshcd-crypto.c +++ b/drivers/scsi/ufs/ufshcd-crypto.c @@ -17,14 +17,20 @@ static const struct ufs_crypto_alg_entry { }, }; -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++) { @@ -37,7 +43,9 @@ 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 int ufshcd_crypto_keyslot_program(struct blk_keyslot_manager *ksm, @@ -52,6 +60,7 @@ static int ufshcd_crypto_keyslot_program(struct blk_keyslot_manager *ksm, int i; int cap_idx = -1; union ufs_crypto_cfg_entry cfg = { 0 }; + int err; BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0); for (i = 0; i < hba->crypto_capabilities.num_crypto_cap; i++) { @@ -79,13 +88,13 @@ static int ufshcd_crypto_keyslot_program(struct blk_keyslot_manager *ksm, memcpy(cfg.crypto_key, key->raw, key->size); } - ufshcd_program_key(hba, &cfg, slot); + err = ufshcd_program_key(hba, &cfg, slot); memzero_explicit(&cfg, sizeof(cfg)); - return 0; + return err; } -static void ufshcd_clear_keyslot(struct ufs_hba *hba, int slot) +static int ufshcd_clear_keyslot(struct ufs_hba *hba, int slot) { /* * Clear the crypto cfg on the device. Clearing CFGE @@ -93,7 +102,7 @@ static void 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); } static int ufshcd_crypto_keyslot_evict(struct blk_keyslot_manager *ksm, @@ -102,9 +111,7 @@ static int ufshcd_crypto_keyslot_evict(struct blk_keyslot_manager *ksm, { struct ufs_hba *hba = container_of(ksm, struct ufs_hba, ksm); - ufshcd_clear_keyslot(hba, slot); - - return 0; + return ufshcd_clear_keyslot(hba, slot); } bool ufshcd_crypto_enable(struct ufs_hba *hba) diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 1cb0fde5772c..feb51dde5a0c 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -320,6 +320,7 @@ 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; @@ -353,6 +354,8 @@ struct ufs_hba_variant_ops { void (*config_scaling_param)(struct ufs_hba *hba, struct devfreq_dev_profile *profile, void *data); + int (*program_key)(struct ufs_hba *hba, + const union ufs_crypto_cfg_entry *cfg, int slot); }; /* clock gating state */