From patchwork Tue Jan 26 00:14:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 370971 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=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 EA50BC433E0 for ; Tue, 26 Jan 2021 05:57:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 984A2207B1 for ; Tue, 26 Jan 2021 05:57:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388914AbhAZF45 (ORCPT ); Tue, 26 Jan 2021 00:56:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:36132 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731921AbhAZCDd (ORCPT ); Mon, 25 Jan 2021 21:03:33 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id DA5EF22B3B; Tue, 26 Jan 2021 00:15:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611620115; bh=WUKP87w2XAHM6dlfW//r1KXDrQH7mn8Uptp48oDpgmo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AJwq9MgRk9X5D0U8P2oV7muJ59EAbweBoiO7bRVgnFmrco/uHhmeS9BiMs7qJWqMb rESA7mYQWU042pu7fra+aFdGl1wTxJRY72QvE7FTwM2ccJ4kqlWZy1L9ASCqmIU7Su eOmh+5CrgDchn9vv79/pR25PQYwwNEW+t2P/HUI1tZO/KgcvTE6kBj0s3NYeStQvXs jI2J5I0OWFtABp+RgWy3v1UVOefbafHTvM8qjEm+oR/PAicNt55VKxo19n2EXPr9Kp 9EevkgExS6kn4zP/NDcCj4MkV27iSpOW63JkrWeBOl7rXxDzjJl+6aZ+h9pJH94CwH 4Kh4HJSTHcjAA== From: Eric Biggers To: linux-mmc@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-fscrypt@vger.kernel.org, Satya Tangirala , Ulf Hansson , Andy Gross , Bjorn Andersson , Adrian Hunter , Asutosh Das , Rob Herring , Neeraj Soni , Barani Muthukumaran , Peng Zhou , Stanley Chu , Konrad Dybcio Subject: [PATCH RESEND v6 5/9] mmc: cqhci: add cqhci_host_ops::program_key Date: Mon, 25 Jan 2021 16:14:52 -0800 Message-Id: <20210126001456.382989-6-ebiggers@kernel.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210126001456.382989-1-ebiggers@kernel.org> References: <20210126001456.382989-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org From: Eric Biggers On Snapdragon SoCs, the Linux kernel isn't permitted to directly access the standard CQHCI 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 cqhci_host_ops'. This allows overriding the standard CQHCI crypto key programming / eviction procedure. This is inspired by the corresponding UFS crypto support, which uses these same SMC calls. See commit 1bc726e26ef3 ("scsi: ufs: Add program_key() variant op"). Acked-by: Adrian Hunter Reviewed-by: Satya Tangirala Reviewed-and-tested-by: Peng Zhou Signed-off-by: Eric Biggers --- drivers/mmc/host/cqhci-crypto.c | 22 +++++++++++++--------- drivers/mmc/host/cqhci.h | 4 ++++ 2 files changed, 17 insertions(+), 9 deletions(-) diff --git a/drivers/mmc/host/cqhci-crypto.c b/drivers/mmc/host/cqhci-crypto.c index 0e2a9dcac6308..6419cfbb4ab78 100644 --- a/drivers/mmc/host/cqhci-crypto.c +++ b/drivers/mmc/host/cqhci-crypto.c @@ -30,13 +30,16 @@ cqhci_host_from_ksm(struct blk_keyslot_manager *ksm) return mmc->cqe_private; } -static void cqhci_crypto_program_key(struct cqhci_host *cq_host, - const union cqhci_crypto_cfg_entry *cfg, - int slot) +static int cqhci_crypto_program_key(struct cqhci_host *cq_host, + const union cqhci_crypto_cfg_entry *cfg, + int slot) { u32 slot_offset = cq_host->crypto_cfg_register + slot * sizeof(*cfg); int i; + if (cq_host->ops->program_key) + return cq_host->ops->program_key(cq_host, cfg, slot); + /* Clear CFGE */ cqhci_writel(cq_host, 0, slot_offset + 16 * sizeof(cfg->reg_val[0])); @@ -51,6 +54,7 @@ static void cqhci_crypto_program_key(struct cqhci_host *cq_host, /* Write dword 16, which includes the new value of CFGE */ cqhci_writel(cq_host, le32_to_cpu(cfg->reg_val[16]), slot_offset + 16 * sizeof(cfg->reg_val[0])); + return 0; } static int cqhci_crypto_keyslot_program(struct blk_keyslot_manager *ksm, @@ -67,6 +71,7 @@ static int cqhci_crypto_keyslot_program(struct blk_keyslot_manager *ksm, int i; int cap_idx = -1; union cqhci_crypto_cfg_entry cfg = {}; + int err; BUILD_BUG_ON(CQHCI_CRYPTO_KEY_SIZE_INVALID != 0); for (i = 0; i < cq_host->crypto_capabilities.num_crypto_cap; i++) { @@ -93,13 +98,13 @@ static int cqhci_crypto_keyslot_program(struct blk_keyslot_manager *ksm, memcpy(cfg.crypto_key, key->raw, key->size); } - cqhci_crypto_program_key(cq_host, &cfg, slot); + err = cqhci_crypto_program_key(cq_host, &cfg, slot); memzero_explicit(&cfg, sizeof(cfg)); - return 0; + return err; } -static void cqhci_crypto_clear_keyslot(struct cqhci_host *cq_host, int slot) +static int cqhci_crypto_clear_keyslot(struct cqhci_host *cq_host, int slot) { /* * Clear the crypto cfg on the device. Clearing CFGE @@ -107,7 +112,7 @@ static void cqhci_crypto_clear_keyslot(struct cqhci_host *cq_host, int slot) */ union cqhci_crypto_cfg_entry cfg = {}; - cqhci_crypto_program_key(cq_host, &cfg, slot); + return cqhci_crypto_program_key(cq_host, &cfg, slot); } static int cqhci_crypto_keyslot_evict(struct blk_keyslot_manager *ksm, @@ -116,8 +121,7 @@ static int cqhci_crypto_keyslot_evict(struct blk_keyslot_manager *ksm, { struct cqhci_host *cq_host = cqhci_host_from_ksm(ksm); - cqhci_crypto_clear_keyslot(cq_host, slot); - return 0; + return cqhci_crypto_clear_keyslot(cq_host, slot); } /* diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h index 8e9e8f5db5bcc..ba9387ed90eb6 100644 --- a/drivers/mmc/host/cqhci.h +++ b/drivers/mmc/host/cqhci.h @@ -286,6 +286,10 @@ struct cqhci_host_ops { u64 *data); void (*pre_enable)(struct mmc_host *mmc); void (*post_disable)(struct mmc_host *mmc); +#ifdef CONFIG_MMC_CRYPTO + int (*program_key)(struct cqhci_host *cq_host, + const union cqhci_crypto_cfg_entry *cfg, int slot); +#endif }; static inline void cqhci_writel(struct cqhci_host *host, u32 val, int reg)