linux-kernel - [PATCH v9 13/23] drivers: crypto: meson: use fallback for 192-bit keys

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Message-ID: <20240820145623.3500864-14-avromanov@salutedevices.com>
Date: Tue, 20 Aug 2024 17:56:13 +0300
From: Alexey Romanov <avromanov@...utedevices.com>
To: <neil.armstrong@...aro.org>, <clabbe@...libre.com>,
	<herbert@...dor.apana.org.au>, <davem@...emloft.net>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<khilman@...libre.com>, <jbrunet@...libre.com>,
	<martin.blumenstingl@...glemail.com>, <vadim.fedorenko@...ux.dev>
CC: <linux-crypto@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <kernel@...utedevices.com>, Alexey
 Romanov <avromanov@...utedevices.com>
Subject: [PATCH v9 13/23] drivers: crypto: meson: use fallback for 192-bit keys

Unforunately, not all Amlogic SoC's have a 192-bit key
support for AES algo. In this case, use fallback.

Signed-off-by: Alexey Romanov <avromanov@...utedevices.com>
---
 drivers/crypto/amlogic/amlogic-gxl-cipher.c | 7 +++++++
 drivers/crypto/amlogic/amlogic-gxl-core.c   | 1 +
 drivers/crypto/amlogic/amlogic-gxl.h        | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/drivers/crypto/amlogic/amlogic-gxl-cipher.c b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
index 5c5956a18744..2c026edb60ed 100644
--- a/drivers/crypto/amlogic/amlogic-gxl-cipher.c
+++ b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
@@ -41,6 +41,13 @@ static bool meson_cipher_need_fallback_sg(struct skcipher_request *areq,
 
 static bool meson_cipher_need_fallback(struct skcipher_request *areq)
 {
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+	struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
+	struct meson_dev *mc = op->mc;
+
+	if (op->keymode == DESC_MODE_AES_192 && !mc->pdata->support_192bit_key)
+		return true;
+
 	if (areq->cryptlen == 0)
 		return true;
 
diff --git a/drivers/crypto/amlogic/amlogic-gxl-core.c b/drivers/crypto/amlogic/amlogic-gxl-core.c
index 2c8387906655..4acacd925a21 100644
--- a/drivers/crypto/amlogic/amlogic-gxl-core.c
+++ b/drivers/crypto/amlogic/amlogic-gxl-core.c
@@ -283,6 +283,7 @@ static const struct meson_pdata meson_gxl_pdata = {
 	.setup_desc_cnt = 3,
 	.hasher_supported = false,
 	.reverse_keyiv = true,
+	.support_192bit_key = true,
 };
 
 static const struct of_device_id meson_crypto_of_match_table[] = {
diff --git a/drivers/crypto/amlogic/amlogic-gxl.h b/drivers/crypto/amlogic/amlogic-gxl.h
index de11e174f03d..01913daf1bf4 100644
--- a/drivers/crypto/amlogic/amlogic-gxl.h
+++ b/drivers/crypto/amlogic/amlogic-gxl.h
@@ -98,6 +98,7 @@ struct meson_flow {
  * @reg_status:	offset to status register
  * @setup_desc_cnt:	number of setup descriptor to configure.
  * @hasher_supported:	indecates whether hasher is supported.
+ * @support_192bit_key:	indicates whether platform support AES 192-bit key
  */
 struct meson_pdata {
 	u32 descs_reg;
@@ -105,6 +106,7 @@ struct meson_pdata {
 	u32 setup_desc_cnt;
 	bool hasher_supported;
 	bool reverse_keyiv;
+	bool support_192bit_key;
 };
 
 /*
-- 
2.34.1