cracen: Basic thread-safety

Makes cracen driver entry points callable from multiple threads.

Signed-off-by: Vidar Lillebø <[email protected]>

subsys/nrf_security/src/drivers/cracen/silexpk/target/baremetal_ba414e_with_ik/pk_baremetal.c

@@ -51,6 +51,8 @@ struct sx_pk_cnx {
 
 struct sx_pk_cnx silex_pk_engine;
 
+K_MUTEX_DEFINE(cracen_mutex_asymmetric);
+
 bool ba414ep_is_busy(sx_pk_req *req)
 {
 	return (bool)(sx_pk_rdreg(&req->regs, PK_REG_STATUS) & PK_BUSY_MASK_BA414EP);
@@ -178,6 +180,7 @@ struct sx_pk_acq_req sx_pk_acquire_req(const struct sx_pk_cmd_def *cmd)
 {
 	struct sx_pk_acq_req req = {NULL, SX_OK};
 
+	k_mutex_lock(&cracen_mutex_asymmetric, K_FOREVER);
 	req.req = &silex_pk_engine.instance;
 	req.req->cmd = cmd;
 	req.req->cnx = &silex_pk_engine;
@@ -214,6 +217,7 @@ void sx_pk_release_req(sx_pk_req *req)
 	cracen_release();
 	req->cmd = NULL;
 	req->userctxt = NULL;
+	k_mutex_unlock(&cracen_mutex_asymmetric);
 }
 
 struct sx_regs *sx_pk_get_regs(void)

subsys/nrf_security/src/drivers/cracen/sxsymcrypt/src/platform/baremetal/cmdma_hw.c

@@ -11,6 +11,7 @@
 #include "../../cmdma.h"
 #include <security/cracen.h>
 #include <cracen/statuscodes.h>
+#include <zephyr/kernel.h>
 
 /* Enable interrupts showing that an operation finished or aborted.
  * For that, we're interested in :
@@ -21,9 +22,12 @@
  */
 #define CMDMA_INTMASK_EN ((1 << 2) | (1 << 5) | (1 << 4))
 
+K_MUTEX_DEFINE(cracen_mutex_symmetric);
+
 void sx_hw_reserve(struct sx_dmactl *dma)
 {
 	cracen_acquire();
+	k_mutex_lock(&cracen_mutex_symmetric, K_FOREVER);
 	dma->hw_acquired = true;
 
 	/* Enable CryptoMaster interrupts. */
@@ -39,6 +43,7 @@ void sx_cmdma_release_hw(struct sx_dmactl *dma)
 {
 	if (dma->hw_acquired) {
 		cracen_release();
+		k_mutex_unlock(&cracen_mutex_symmetric);
 		dma->hw_acquired = false;
 	}
 }