From patchwork Wed Jun 17 08:18:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Satya Tangirala X-Patchwork-Id: 213741 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=DKIMWL_WL_MED, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3A951C433DF for ; Wed, 17 Jun 2020 08:18:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 03828207DD for ; Wed, 17 Jun 2020 08:18:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Wu5CaZOZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726341AbgFQISu (ORCPT ); Wed, 17 Jun 2020 04:18:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725860AbgFQISu (ORCPT ); Wed, 17 Jun 2020 04:18:50 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69809C061573 for ; Wed, 17 Jun 2020 01:18:48 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id s7so1694902ybg.10 for ; Wed, 17 Jun 2020 01:18:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=HbYj/ITUFLOls71ypVtnDCyGAclpgP92rjcNpUejoV0=; b=Wu5CaZOZBWjSL466IdTxYW4Qp33fSkjkToEyTLUsGkRd4jpWFxRzkGqLIYNglENgsB 8leu/FPuZ3oEp1fr1TkETJ5Wa01vp4gIU+juT9DMonFzvVHbqABEAf9k6LwL10DIrjo+ VfHCA1thkxMauOpec9TNc22gmAM6OIg/iIWwZGuzEL7AaXgJo8Jv4YZC6aKPsOXZSxMi tXOLFQumf8a0+W46CyqNS6LWbVy0tQrg0i28O5dvqmA++PSLJWP0R1qe5EN0aC0AVDIV m1sugPOCGrqTkTgUv0BSAYjDWOnlOmdDc6XqPiwUD6lu0v61f5Php+z93y9OBhMAQtlQ Vu9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=HbYj/ITUFLOls71ypVtnDCyGAclpgP92rjcNpUejoV0=; b=L1UVo/Vy/0L+Rsy0CbypVoNcNirtTFR0H5b5ldT+UCNGYxc5HEUA0Gq8TnIukfa1Mw 86Zd5DnK5nRi6gOJXx/wK+eZBXQcNMZcJ80RBBV0QusbGazYfpz+p7d2XToQ1uGx5AnK DYlRMwyUN/ZN3FDG5YrN5Zn7+HdiAR0zbwtuv7gVCS/atgANf1zF/+aP9MR8CnO/neNv 7jsRiUA1kdv45YiVioRyiJyQkH68144+envAgxGfW5Ac76aHuEqkC4pcvmuMd/riEmSE moeFWKawyjzK1gCoFidejilXTDG8S+NHFD93rXgWi0Tms3NgJi2WHsNntuVFnl0nheit WWFA== X-Gm-Message-State: AOAM531vPH1brVBLbfKkYytexVjgKbKxOcW47dxmDqdRTj5Bj2oJYH0Z ekYVPnov1D0tcqcAgW36FetDpuDrxRrpdhQ05lUu/80QIJtKXHP+ePwoaWCt7YwZq5spsPcDxO5 Wb3RkxE84wy6XU1r8Y5vX9swH1wXFEaw/XT8k31/gkoY7HWPAdayAw0Yu2QVM7efRTH4= X-Google-Smtp-Source: ABdhPJyu8kWK9eBpr7IEI9xW1iay6jcJ7969Vx4Y3km7iLzoEr5SBAI2/Jjb+6AASUuxANNcbWOh0tkvewA= X-Received: by 2002:a25:400e:: with SMTP id n14mr9560996yba.424.1592381927565; Wed, 17 Jun 2020 01:18:47 -0700 (PDT) Date: Wed, 17 Jun 2020 08:18:40 +0000 In-Reply-To: <20200617081841.218985-1-satyat@google.com> Message-Id: <20200617081841.218985-3-satyat@google.com> Mime-Version: 1.0 References: <20200617081841.218985-1-satyat@google.com> X-Mailer: git-send-email 2.27.0.290.gba653c62da-goog Subject: [PATCH 2/3] scsi: ufs: UFS crypto API From: Satya Tangirala To: linux-scsi@vger.kernel.org Cc: Satya Tangirala , Eric Biggers Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Introduce functions to manipulate UFS inline encryption hardware in line with the JEDEC UFSHCI v2.1 specification and to work with the block keyslot manager. The UFS crypto API will assume by default that a vendor driver doesn't support UFS crypto, even if the hardware advertises the capability, because a lot of hardware requires some special handling that's not specified in the aforementioned JEDEC spec. Each vendor driver must explicity set hba->caps |= UFSHCD_CAP_CRYPTO before ufshcd_hba_init_crypto is called to opt-in to UFS crypto support. Signed-off-by: Satya Tangirala Reviewed-by: Eric Biggers --- drivers/scsi/ufs/Kconfig | 9 ++ drivers/scsi/ufs/Makefile | 1 + drivers/scsi/ufs/ufshcd-crypto.c | 226 +++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufshcd-crypto.h | 42 ++++++ drivers/scsi/ufs/ufshcd.h | 12 ++ 5 files changed, 290 insertions(+) create mode 100644 drivers/scsi/ufs/ufshcd-crypto.c create mode 100644 drivers/scsi/ufs/ufshcd-crypto.h diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig index d35378be89e8..4c0a9661049a 100644 --- a/drivers/scsi/ufs/Kconfig +++ b/drivers/scsi/ufs/Kconfig @@ -160,3 +160,12 @@ config SCSI_UFS_BSG Select this if you need a bsg device node for your UFS controller. If unsure, say N. + +config SCSI_UFS_CRYPTO + bool "UFS Crypto Engine Support" + depends on SCSI_UFSHCD && BLK_INLINE_ENCRYPTION + help + Enable Crypto Engine Support in UFS. + Enabling this makes it possible for the kernel to use the crypto + capabilities of the UFS device (if present) to perform crypto + operations on data being transferred to/from the device. diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile index 94c6c5d7334b..197e178f44bc 100644 --- a/drivers/scsi/ufs/Makefile +++ b/drivers/scsi/ufs/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o ufshcd-core-y += ufshcd.o ufs-sysfs.o ufshcd-core-$(CONFIG_SCSI_UFS_BSG) += ufs_bsg.o +ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO) += ufshcd-crypto.o obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o diff --git a/drivers/scsi/ufs/ufshcd-crypto.c b/drivers/scsi/ufs/ufshcd-crypto.c new file mode 100644 index 000000000000..65a3115d2a2d --- /dev/null +++ b/drivers/scsi/ufs/ufshcd-crypto.c @@ -0,0 +1,226 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2019 Google LLC + */ + +#include "ufshcd.h" +#include "ufshcd-crypto.h" + +/* Blk-crypto modes supported by UFS crypto */ +static const struct ufs_crypto_alg_entry { + enum ufs_crypto_alg ufs_alg; + enum ufs_crypto_key_size ufs_key_size; +} ufs_crypto_algs[BLK_ENCRYPTION_MODE_MAX] = { + [BLK_ENCRYPTION_MODE_AES_256_XTS] = { + .ufs_alg = UFS_CRYPTO_ALG_AES_XTS, + .ufs_key_size = UFS_CRYPTO_KEY_SIZE_256, + }, +}; + +static void 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); + + ufshcd_hold(hba, false); + /* 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++) { + ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[i]), + slot_offset + i * sizeof(cfg->reg_val[0])); + } + /* Write dword 17 */ + ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[17]), + slot_offset + 17 * sizeof(cfg->reg_val[0])); + /* Dword 16 must be written last */ + ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[16]), + slot_offset + 16 * sizeof(cfg->reg_val[0])); + ufshcd_release(hba); +} + +static int ufshcd_crypto_keyslot_program(struct blk_keyslot_manager *ksm, + const struct blk_crypto_key *key, + unsigned int slot) +{ + struct ufs_hba *hba = container_of(ksm, struct ufs_hba, ksm); + const union ufs_crypto_cap_entry *ccap_array = hba->crypto_cap_array; + const struct ufs_crypto_alg_entry *alg = + &ufs_crypto_algs[key->crypto_cfg.crypto_mode]; + u8 data_unit_mask = key->crypto_cfg.data_unit_size / 512; + int i; + int cap_idx = -1; + union ufs_crypto_cfg_entry cfg = { 0 }; + + BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0); + for (i = 0; i < hba->crypto_capabilities.num_crypto_cap; i++) { + if (ccap_array[i].algorithm_id == alg->ufs_alg && + ccap_array[i].key_size == alg->ufs_key_size && + (ccap_array[i].sdus_mask & data_unit_mask)) { + cap_idx = i; + break; + } + } + + if (WARN_ON(cap_idx < 0)) + return -EOPNOTSUPP; + + cfg.data_unit_size = data_unit_mask; + cfg.crypto_cap_idx = cap_idx; + cfg.config_enable = UFS_CRYPTO_CONFIGURATION_ENABLE; + + if (ccap_array[cap_idx].algorithm_id == UFS_CRYPTO_ALG_AES_XTS) { + /* In XTS mode, the blk_crypto_key's size is already doubled */ + memcpy(cfg.crypto_key, key->raw, key->size/2); + memcpy(cfg.crypto_key + UFS_CRYPTO_KEY_MAX_SIZE/2, + key->raw + key->size/2, key->size/2); + } else { + memcpy(cfg.crypto_key, key->raw, key->size); + } + + ufshcd_program_key(hba, &cfg, slot); + + memzero_explicit(&cfg, sizeof(cfg)); + return 0; +} + +static void ufshcd_clear_keyslot(struct ufs_hba *hba, int slot) +{ + /* + * Clear the crypto cfg on the device. Clearing CFGE + * might not be sufficient, so just clear the entire cfg. + */ + union ufs_crypto_cfg_entry cfg = { 0 }; + + ufshcd_program_key(hba, &cfg, slot); +} + +static int ufshcd_crypto_keyslot_evict(struct blk_keyslot_manager *ksm, + const struct blk_crypto_key *key, + unsigned int slot) +{ + struct ufs_hba *hba = container_of(ksm, struct ufs_hba, ksm); + + ufshcd_clear_keyslot(hba, slot); + + return 0; +} + +bool ufshcd_crypto_enable(struct ufs_hba *hba) +{ + if (!(hba->caps & UFSHCD_CAP_CRYPTO)) + return false; + + /* Reset might clear all keys, so reprogram all the keys. */ + blk_ksm_reprogram_all_keys(&hba->ksm); + return true; +} + +static const struct blk_ksm_ll_ops ufshcd_ksm_ops = { + .keyslot_program = ufshcd_crypto_keyslot_program, + .keyslot_evict = ufshcd_crypto_keyslot_evict, +}; + +static enum blk_crypto_mode_num +ufshcd_find_blk_crypto_mode(union ufs_crypto_cap_entry cap) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ufs_crypto_algs); i++) { + BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0); + if (ufs_crypto_algs[i].ufs_alg == cap.algorithm_id && + ufs_crypto_algs[i].ufs_key_size == cap.key_size) { + return i; + } + } + return BLK_ENCRYPTION_MODE_INVALID; +} + +/** + * ufshcd_hba_init_crypto - Read crypto capabilities, init crypto fields in hba + * @hba: Per adapter instance + * + * Return: 0 if crypto was initialized or is not supported, else a -errno value. + */ +int ufshcd_hba_init_crypto(struct ufs_hba *hba) +{ + int cap_idx = 0; + int err = 0; + enum blk_crypto_mode_num blk_mode_num; + int slot = 0; + int num_keyslots; + + /* + * Don't use crypto if either the hardware doesn't advertise the + * standard crypto capability bit *or* if the vendor specific driver + * hasn't advertised that crypto is supported. + */ + if (!(hba->capabilities & MASK_CRYPTO_SUPPORT) || + !(hba->caps & UFSHCD_CAP_CRYPTO)) + goto out; + + hba->crypto_capabilities.reg_val = + cpu_to_le32(ufshcd_readl(hba, REG_UFS_CCAP)); + hba->crypto_cfg_register = + (u32)hba->crypto_capabilities.config_array_ptr * 0x100; + hba->crypto_cap_array = + devm_kcalloc(hba->dev, hba->crypto_capabilities.num_crypto_cap, + sizeof(hba->crypto_cap_array[0]), GFP_KERNEL); + if (!hba->crypto_cap_array) { + err = -ENOMEM; + goto out; + } + + /* The actual number of configurations supported is (CFGC+1) */ + num_keyslots = hba->crypto_capabilities.config_count + 1; + err = blk_ksm_init(&hba->ksm, num_keyslots); + if (err) + goto out_free_caps; + + hba->ksm.ksm_ll_ops = ufshcd_ksm_ops; + /* UFS only supports 8 bytes for any DUN */ + hba->ksm.max_dun_bytes_supported = 8; + hba->ksm.dev = hba->dev; + + /* + * Cache all the UFS crypto capabilities and advertise the supported + * crypto modes and data unit sizes to the block layer. + */ + for (cap_idx = 0; cap_idx < hba->crypto_capabilities.num_crypto_cap; + cap_idx++) { + hba->crypto_cap_array[cap_idx].reg_val = + cpu_to_le32(ufshcd_readl(hba, + REG_UFS_CRYPTOCAP + + cap_idx * sizeof(__le32))); + blk_mode_num = ufshcd_find_blk_crypto_mode( + hba->crypto_cap_array[cap_idx]); + if (blk_mode_num != BLK_ENCRYPTION_MODE_INVALID) + hba->ksm.crypto_modes_supported[blk_mode_num] |= + hba->crypto_cap_array[cap_idx].sdus_mask * 512; + } + + for (slot = 0; slot < num_keyslots; slot++) + ufshcd_clear_keyslot(hba, slot); + + return 0; + +out_free_caps: + devm_kfree(hba->dev, hba->crypto_cap_array); +out: + /* Indicate that init failed by clearing UFSHCD_CAP_CRYPTO */ + hba->caps &= ~UFSHCD_CAP_CRYPTO; + return err; +} + +void ufshcd_crypto_setup_rq_keyslot_manager(struct ufs_hba *hba, + struct request_queue *q) +{ + if (hba->caps & UFSHCD_CAP_CRYPTO) + blk_ksm_register(&hba->ksm, q); +} + +void ufshcd_crypto_destroy_keyslot_manager(struct ufs_hba *hba) +{ + blk_ksm_destroy(&hba->ksm); +} diff --git a/drivers/scsi/ufs/ufshcd-crypto.h b/drivers/scsi/ufs/ufshcd-crypto.h new file mode 100644 index 000000000000..22677619de59 --- /dev/null +++ b/drivers/scsi/ufs/ufshcd-crypto.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright 2019 Google LLC + */ + +#ifndef _UFSHCD_CRYPTO_H +#define _UFSHCD_CRYPTO_H + +#ifdef CONFIG_SCSI_UFS_CRYPTO +#include "ufshcd.h" +#include "ufshci.h" + +bool ufshcd_crypto_enable(struct ufs_hba *hba); + +int ufshcd_hba_init_crypto(struct ufs_hba *hba); + +void ufshcd_crypto_setup_rq_keyslot_manager(struct ufs_hba *hba, + struct request_queue *q); + +void ufshcd_crypto_destroy_keyslot_manager(struct ufs_hba *hba); + +#else /* CONFIG_SCSI_UFS_CRYPTO */ + +static inline bool ufshcd_crypto_enable(struct ufs_hba *hba) +{ + return false; +} + +static inline int ufshcd_hba_init_crypto(struct ufs_hba *hba) +{ + return 0; +} + +static inline void ufshcd_crypto_setup_rq_keyslot_manager(struct ufs_hba *hba, + struct request_queue *q) { } + +static inline void ufshcd_crypto_destroy_keyslot_manager(struct ufs_hba *hba) +{ } + +#endif /* CONFIG_SCSI_UFS_CRYPTO */ + +#endif /* _UFSHCD_CRYPTO_H */ diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index b4981f1c37a2..271fc19f8002 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -57,6 +57,7 @@ #include #include #include +#include #include "unipro.h" #include @@ -630,6 +631,10 @@ struct ufs_hba_variant_params { * @is_urgent_bkops_lvl_checked: keeps track if the urgent bkops level for * device is known or not. * @scsi_block_reqs_cnt: reference counting for scsi block requests + * @crypto_capabilities: Content of crypto capabilities register (0x100) + * @crypto_cap_array: Array of crypto capabilities + * @crypto_cfg_register: Start of the crypto cfg array + * @ksm: the keyslot manager tied to this hba */ struct ufs_hba { void __iomem *mmio_base; @@ -752,6 +757,13 @@ struct ufs_hba { bool wb_buf_flush_enabled; bool wb_enabled; struct delayed_work rpm_dev_flush_recheck_work; + +#ifdef CONFIG_SCSI_UFS_CRYPTO + union ufs_crypto_capabilities crypto_capabilities; + union ufs_crypto_cap_entry *crypto_cap_array; + u32 crypto_cfg_register; + struct blk_keyslot_manager ksm; +#endif }; /* Returns true if clocks can be gated. Otherwise false */