linux-kernel - [PATCH v7 08/17] firmware: qcom: scm: add a call for checking wrapped key support

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Message-Id: <20241011-wrapped-keys-v7-8-e3f7a752059b@linaro.org>
Date: Fri, 11 Oct 2024 20:54:07 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>, 
 Alasdair Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>, 
 Mikulas Patocka <mpatocka@...hat.com>, 
 Adrian Hunter <adrian.hunter@...el.com>, 
 Asutosh Das <quic_asutoshd@...cinc.com>, 
 Ritesh Harjani <ritesh.list@...il.com>, 
 Ulf Hansson <ulf.hansson@...aro.org>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Avri Altman <avri.altman@....com>, Bart Van Assche <bvanassche@....org>, 
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 Eric Biggers <ebiggers@...nel.org>, "Theodore Y. Ts'o" <tytso@....edu>, 
 Jaegeuk Kim <jaegeuk@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Gaurav Kashyap <quic_gaurkash@...cinc.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-block@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, dm-devel@...ts.linux.dev, 
 linux-mmc@...r.kernel.org, linux-scsi@...r.kernel.org, 
 linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v7 08/17] firmware: qcom: scm: add a call for checking
 wrapped key support

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Add a helper that allows users to check if wrapped key support is
available on the platform by checking if the SCM call allowing to
derive the software secret from a wrapped key is enabled.

Reviewed-by: Konrad Dybcio <konradybcio@...nel.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/firmware/qcom/qcom_scm.c       | 7 +++++++
 include/linux/firmware/qcom/qcom_scm.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 3a59fd2a45b5..f1f723b53e8f 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -1252,6 +1252,13 @@ int qcom_scm_ice_set_key(u32 index, const u8 *key, u32 key_size,
 }
 EXPORT_SYMBOL_GPL(qcom_scm_ice_set_key);

+bool qcom_scm_has_wrapped_key_support(void)
+{
+	return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_ES,
+					    QCOM_SCM_ES_DERIVE_SW_SECRET);
+}
+EXPORT_SYMBOL_GPL(qcom_scm_has_wrapped_key_support);
+
 /**
  * qcom_scm_derive_sw_secret() - Derive software secret from wrapped key
  * @wkey: the hardware wrapped key inaccessible to software
diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
index b5ab39b35490..94d4e3c96210 100644
--- a/include/linux/firmware/qcom/qcom_scm.h
+++ b/include/linux/firmware/qcom/qcom_scm.h
@@ -110,6 +110,7 @@ int qcom_scm_prepare_ice_key(const u8 *lt_key, size_t lt_key_size,
 			     u8 *eph_key, size_t eph_size);
 int qcom_scm_import_ice_key(const u8 *imp_key, size_t imp_size,
 			    u8 *lt_key, size_t lt_key_size);
+bool qcom_scm_has_wrapped_key_support(void);

 bool qcom_scm_hdcp_available(void);
 int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp);

-- 
2.43.0