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[84.74.0.139]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48fe4dac000sm356457755e9.0.2026.05.19.13.48.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 13:48:16 -0700 (PDT) From: Lothar Rubusch To: thorsten.blum@linux.dev, herbert@gondor.apana.org.au, davem@davemloft.net, nicolas.ferre@microchip.com, alexandre.belloni@bootlin.com, claudiu.beznea@tuxon.dev Cc: linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, l.rubusch@gmail.com Subject: [PATCH v2 08/12] crypto: atmel-i2c - move shared client allocation logic to core Date: Tue, 19 May 2026 20:47:59 +0000 Message-Id: <20260519204803.17034-9-l.rubusch@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260519204803.17034-1-l.rubusch@gmail.com> References: <20260519204803.17034-1-l.rubusch@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Migrate the I2C client allocation and runtime load-balancing routines out of the ECC driver code and into the central atmel-i2c core library module. Export the symmetric lifecycle helper interfaces atmel_i2c_client_alloc() and atmel_i2c_client_free() using EXPORT_SYMBOL_GPL() to expose a unified client management API. This consolidation enables the dynamic selection subsystem (which chooses the least-loaded client device based on the active transformation count) to be shared by both the ECC driver and upcoming Atmel crypto modules. Refactor the ECC driver's transformation context initialization (init_tfm) and teardown (exit_tfm) paths to use this centralized core API. No functional change is intended. Signed-off-by: Lothar Rubusch --- drivers/crypto/atmel-ecc.c | 50 +++----------------------------------- drivers/crypto/atmel-i2c.c | 46 +++++++++++++++++++++++++++++++++++ drivers/crypto/atmel-i2c.h | 3 +++ 3 files changed, 52 insertions(+), 47 deletions(-) diff --git a/drivers/crypto/atmel-ecc.c b/drivers/crypto/atmel-ecc.c index 4f27e1caf106..7d090c557330 100644 --- a/drivers/crypto/atmel-ecc.c +++ b/drivers/crypto/atmel-ecc.c @@ -203,50 +203,6 @@ static int atmel_ecdh_compute_shared_secret(struct kpp_request *req) return ret; } -static struct i2c_client *atmel_ecc_i2c_client_alloc(void) -{ - struct atmel_i2c_client_priv *i2c_priv, *min_i2c_priv = NULL; - struct i2c_client *client = ERR_PTR(-ENODEV); - int min_tfm_cnt = INT_MAX; - int tfm_cnt; - - spin_lock(&atmel_i2c_mgmt.i2c_list_lock); - - if (list_empty(&atmel_i2c_mgmt.i2c_client_list)) { - spin_unlock(&atmel_i2c_mgmt.i2c_list_lock); - return ERR_PTR(-ENODEV); - } - - list_for_each_entry(i2c_priv, &atmel_i2c_mgmt.i2c_client_list, - i2c_client_list_node) { - if (!i2c_priv->ready) - continue; - tfm_cnt = atomic_read(&i2c_priv->tfm_count); - if (tfm_cnt < min_tfm_cnt) { - min_tfm_cnt = tfm_cnt; - min_i2c_priv = i2c_priv; - } - if (!min_tfm_cnt) - break; - } - - if (min_i2c_priv) { - atomic_inc(&min_i2c_priv->tfm_count); - client = min_i2c_priv->client; - } - - spin_unlock(&atmel_i2c_mgmt.i2c_list_lock); - - return client; -} - -static void atmel_ecc_i2c_client_free(struct i2c_client *client) -{ - struct atmel_i2c_client_priv *i2c_priv = i2c_get_clientdata(client); - - atomic_dec(&i2c_priv->tfm_count); -} - static int atmel_ecdh_init_tfm(struct crypto_kpp *tfm) { const char *alg = kpp_alg_name(tfm); @@ -254,7 +210,7 @@ static int atmel_ecdh_init_tfm(struct crypto_kpp *tfm) struct atmel_ecdh_ctx *ctx = kpp_tfm_ctx(tfm); ctx->curve_id = ECC_CURVE_NIST_P256; - ctx->client = atmel_ecc_i2c_client_alloc(); + ctx->client = atmel_i2c_client_alloc(); if (IS_ERR(ctx->client)) { pr_err("tfm - i2c_client binding failed\n"); return PTR_ERR(ctx->client); @@ -264,7 +220,7 @@ static int atmel_ecdh_init_tfm(struct crypto_kpp *tfm) if (IS_ERR(fallback)) { dev_err(&ctx->client->dev, "Failed to allocate transformation for '%s': %ld\n", alg, PTR_ERR(fallback)); - atmel_ecc_i2c_client_free(ctx->client); + atmel_i2c_client_free(ctx->client); return PTR_ERR(fallback); } @@ -280,7 +236,7 @@ static void atmel_ecdh_exit_tfm(struct crypto_kpp *tfm) kfree(ctx->public_key); crypto_free_kpp(ctx->fallback); - atmel_ecc_i2c_client_free(ctx->client); + atmel_i2c_client_free(ctx->client); } static unsigned int atmel_ecdh_max_size(struct crypto_kpp *tfm) diff --git a/drivers/crypto/atmel-i2c.c b/drivers/crypto/atmel-i2c.c index c73ef3cadf0e..4621aa57833f 100644 --- a/drivers/crypto/atmel-i2c.c +++ b/drivers/crypto/atmel-i2c.c @@ -57,6 +57,52 @@ static void atmel_i2c_checksum(struct atmel_i2c_cmd *cmd) *__crc16 = cpu_to_le16(bitrev16(crc16(0, data, len))); } +struct i2c_client *atmel_i2c_client_alloc(void) +{ + struct atmel_i2c_client_priv *i2c_priv, *min_i2c_priv = NULL; + struct i2c_client *client = ERR_PTR(-ENODEV); + int min_tfm_cnt = INT_MAX; + int tfm_cnt; + + spin_lock(&atmel_i2c_mgmt.i2c_list_lock); + + if (list_empty(&atmel_i2c_mgmt.i2c_client_list)) { + spin_unlock(&atmel_i2c_mgmt.i2c_list_lock); + return ERR_PTR(-ENODEV); + } + + list_for_each_entry(i2c_priv, &atmel_i2c_mgmt.i2c_client_list, + i2c_client_list_node) { + if (!i2c_priv->ready) + continue; + tfm_cnt = atomic_read(&i2c_priv->tfm_count); + if (tfm_cnt < min_tfm_cnt) { + min_tfm_cnt = tfm_cnt; + min_i2c_priv = i2c_priv; + } + if (!min_tfm_cnt) + break; + } + + if (min_i2c_priv) { + atomic_inc(&min_i2c_priv->tfm_count); + client = min_i2c_priv->client; + } + + spin_unlock(&atmel_i2c_mgmt.i2c_list_lock); + + return client; +} +EXPORT_SYMBOL_GPL(atmel_i2c_client_alloc); + +void atmel_i2c_client_free(struct i2c_client *client) +{ + struct atmel_i2c_client_priv *i2c_priv = i2c_get_clientdata(client); + + atomic_dec(&i2c_priv->tfm_count); +} +EXPORT_SYMBOL_GPL(atmel_i2c_client_free); + void atmel_i2c_init_read_config_cmd(struct atmel_i2c_cmd *cmd) { cmd->word_addr = COMMAND; diff --git a/drivers/crypto/atmel-i2c.h b/drivers/crypto/atmel-i2c.h index 351306c426aa..6c2d86fd9068 100644 --- a/drivers/crypto/atmel-i2c.h +++ b/drivers/crypto/atmel-i2c.h @@ -192,6 +192,9 @@ void atmel_i2c_init_genkey_cmd(struct atmel_i2c_cmd *cmd, u16 keyid); int atmel_i2c_init_ecdh_cmd(struct atmel_i2c_cmd *cmd, struct scatterlist *pubkey); +struct i2c_client *atmel_i2c_client_alloc(void); +void atmel_i2c_client_free(struct i2c_client *client); + void atmel_i2c_deactivate_client(struct atmel_i2c_client_priv *i2c_priv); void atmel_i2c_unregister_client(struct atmel_i2c_client_priv *i2c_priv); -- 2.39.5