[PATCH 1/1] tee: amdtee: store buffer ID in tee_shm->sec_world_id

[Rijo Thomas]

Drop struct amdtee_shm_data and the per-context shm_list. In
handle_map_shmem() save the returned buf_id in shm->sec_world_id
instead of allocating a list node. Use shm->sec_world_id (with
get_buffer_id() removed) in amdtee_unmap_shmem() and in call.c when
building memref params. Remove shm_list and shm_mutex from
amdtee_context_data.

Aligns amdtee with other TEE drivers (optee, tstee, qcomtee) that use
tee_shm->sec_world_id for the secure-world handle.

Signed-off-by: Rijo Thomas <Rijo-john.Thomas@xxxxxxx>
---
 drivers/tee/amdtee/amdtee_private.h | 16 ---------
 drivers/tee/amdtee/call.c           |  2 +-
 drivers/tee/amdtee/core.c           | 52 +++--------------------------
 3 files changed, 5 insertions(+), 65 deletions(-)

diff --git a/drivers/tee/amdtee/amdtee_private.h b/drivers/tee/amdtee/amdtee_private.h
index d87050033894..2c5ba02258b8 100644
--- a/drivers/tee/amdtee/amdtee_private.h
+++ b/drivers/tee/amdtee/amdtee_private.h
@@ -65,13 +65,9 @@ struct amdtee_session {
 /**
  * struct amdtee_context_data - AMD-TEE driver context data
  * @sess_list:    Keeps track of sessions opened in current TEE context
- * @shm_list:     Keeps track of buffers allocated and mapped in current TEE
- *                context
  */
 struct amdtee_context_data {
 	struct list_head sess_list;
-	struct list_head shm_list;
-	struct mutex shm_mutex;   /* synchronizes access to @shm_list */
 };
 
 struct amdtee_driver_data {
@@ -83,17 +79,6 @@ struct shmem_desc {
 	u64 size;
 };
 
-/**
- * struct amdtee_shm_data - Shared memory data
- * @kaddr:	Kernel virtual address of shared memory
- * @buf_id:	Buffer id of memory mapped by TEE_CMD_ID_MAP_SHARED_MEM
- */
-struct amdtee_shm_data {
-	struct  list_head shm_node;
-	void    *kaddr;
-	u32     buf_id;
-};
-
 /**
  * struct amdtee_ta_data - Keeps track of all TAs loaded in AMD Secure
  *			   Processor
@@ -168,5 +153,4 @@ int handle_invoke_cmd(struct tee_ioctl_invoke_arg *arg, u32 sinfo,
 
 struct tee_shm_pool *amdtee_config_shm(void);
 
-u32 get_buffer_id(struct tee_shm *shm);
 #endif /*AMDTEE_PRIVATE_H*/
diff --git a/drivers/tee/amdtee/call.c b/drivers/tee/amdtee/call.c
index 441b2ceaafc3..23ccd0f037a7 100644
--- a/drivers/tee/amdtee/call.c
+++ b/drivers/tee/amdtee/call.c
@@ -45,7 +45,7 @@ static int tee_params_to_amd_params(struct tee_param *tee, u32 count,
 
 		/* It is assumed that all values are within 2^32-1 */
 		if (type > TEE_OP_PARAM_TYPE_VALUE_INOUT) {
-			u32 buf_id = get_buffer_id(tee[i].u.memref.shm);
+			u32 buf_id = (u32)tee[i].u.memref.shm->sec_world_id;
 
 			amd->params[i].mref.buf_id = buf_id;
 			amd->params[i].mref.offset = tee[i].u.memref.shm_offs;
diff --git a/drivers/tee/amdtee/core.c b/drivers/tee/amdtee/core.c
index a1347d04b3ac..0e56f4cf2697 100644
--- a/drivers/tee/amdtee/core.c
+++ b/drivers/tee/amdtee/core.c
@@ -43,8 +43,6 @@ static int amdtee_open(struct tee_context *ctx)
 		return -ENOMEM;
 
 	INIT_LIST_HEAD(&ctxdata->sess_list);
-	INIT_LIST_HEAD(&ctxdata->shm_list);
-	mutex_init(&ctxdata->shm_mutex);
 
 	ctx->data = ctxdata;
 	return 0;
@@ -87,7 +85,6 @@ static void amdtee_release(struct tee_context *ctx)
 		list_del(&sess->list_node);
 		release_session(sess);
 	}
-	mutex_destroy(&ctxdata->shm_mutex);
 	kfree(ctxdata);
 
 	ctx->data = NULL;
@@ -152,23 +149,6 @@ static struct amdtee_session *find_session(struct amdtee_context_data *ctxdata,
 	return NULL;
 }
 
-u32 get_buffer_id(struct tee_shm *shm)
-{
-	struct amdtee_context_data *ctxdata = shm->ctx->data;
-	struct amdtee_shm_data *shmdata;
-	u32 buf_id = 0;
-
-	mutex_lock(&ctxdata->shm_mutex);
-	list_for_each_entry(shmdata, &ctxdata->shm_list, shm_node)
-		if (shmdata->kaddr == shm->kaddr) {
-			buf_id = shmdata->buf_id;
-			break;
-		}
-	mutex_unlock(&ctxdata->shm_mutex);
-
-	return buf_id;
-}
-
 static DEFINE_MUTEX(drv_mutex);
 static int copy_ta_binary(struct tee_context *ctx, void *ptr, void **ta,
 			  size_t *ta_size)
@@ -342,8 +322,6 @@ int amdtee_close_session(struct tee_context *ctx, u32 session)
 
 int amdtee_map_shmem(struct tee_shm *shm)
 {
-	struct amdtee_context_data *ctxdata;
-	struct amdtee_shm_data *shmnode;
 	struct shmem_desc shmem;
 	int rc, count;
 	u32 buf_id;
@@ -351,10 +329,6 @@ int amdtee_map_shmem(struct tee_shm *shm)
 	if (!shm)
 		return -EINVAL;
 
-	shmnode = kmalloc_obj(*shmnode);
-	if (!shmnode)
-		return -ENOMEM;
-
 	count = 1;
 	shmem.kaddr = shm->kaddr;
 	shmem.size = shm->size;
@@ -366,44 +340,26 @@ int amdtee_map_shmem(struct tee_shm *shm)
 	rc = handle_map_shmem(count, &shmem, &buf_id);
 	if (rc) {
 		pr_err("map_shmem failed: ret = %d\n", rc);
-		kfree(shmnode);
 		return rc;
 	}
 
-	shmnode->kaddr = shm->kaddr;
-	shmnode->buf_id = buf_id;
-	ctxdata = shm->ctx->data;
-	mutex_lock(&ctxdata->shm_mutex);
-	list_add(&shmnode->shm_node, &ctxdata->shm_list);
-	mutex_unlock(&ctxdata->shm_mutex);
+	shm->sec_world_id = buf_id;
 
-	pr_debug("buf_id :[%x] kaddr[%p]\n", shmnode->buf_id, shmnode->kaddr);
+	pr_debug("buf_id :[%x] kaddr[%p]\n", buf_id, shm->kaddr);
 
 	return 0;
 }
 
 void amdtee_unmap_shmem(struct tee_shm *shm)
 {
-	struct amdtee_context_data *ctxdata;
-	struct amdtee_shm_data *shmnode;
 	u32 buf_id;
 
 	if (!shm)
 		return;
 
-	buf_id = get_buffer_id(shm);
-	/* Unmap the shared memory from TEE */
+	buf_id = (u32)shm->sec_world_id;
 	handle_unmap_shmem(buf_id);
-
-	ctxdata = shm->ctx->data;
-	mutex_lock(&ctxdata->shm_mutex);
-	list_for_each_entry(shmnode, &ctxdata->shm_list, shm_node)
-		if (buf_id == shmnode->buf_id) {
-			list_del(&shmnode->shm_node);
-			kfree(shmnode);
-			break;
-		}
-	mutex_unlock(&ctxdata->shm_mutex);
+	shm->sec_world_id = 0;
 }
 
 int amdtee_invoke_func(struct tee_context *ctx,
-- 
2.43.0