[PATCH v2 5/5] optee: add FF-A support
From: Jens Wiklander
Date: Thu May 27 2021 - 04:14:41 EST
Adds support for using FF-A [1] as transport to the OP-TEE driver.
Introduces struct optee_msg_param_fmem which carries all information
needed when OP-TEE is calling FFA_MEM_RETRIEVE_REQ to get the shared
memory reference mapped by the hypervisor in S-EL2. Register usage is
also updated to include the information needed.
The FF-A part of this driver is enabled if CONFIG_ARM_FFA_TRANSPORT is
enabled.
[1] https://developer.arm.com/documentation/den0077/latest
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
---
drivers/tee/optee/call.c | 212 ++++++++++++-
drivers/tee/optee/core.c | 486 +++++++++++++++++++++++++++++-
drivers/tee/optee/optee_ffa.h | 153 ++++++++++
drivers/tee/optee/optee_msg.h | 27 +-
drivers/tee/optee/optee_private.h | 52 ++++
drivers/tee/optee/rpc.c | 118 ++++++++
6 files changed, 1040 insertions(+), 8 deletions(-)
create mode 100644 drivers/tee/optee/optee_ffa.h
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index f5d77ef780b9..c21f59111fc8 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -3,15 +3,18 @@
* Copyright (c) 2015-2021, Linaro Limited
*/
#include <linux/arm-smccc.h>
+#include <linux/arm_ffa.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/sched.h>
+#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
#include <linux/uaccess.h>
+#include "optee_ffa.h"
#include "optee_private.h"
#include "optee_smc.h"
#define CREATE_TRACE_POINTS
@@ -183,11 +186,21 @@ int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg)
static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,
struct optee_msg_arg **msg_arg)
{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ size_t sz = OPTEE_MSG_GET_ARG_SIZE(num_params);
struct tee_shm *shm;
struct optee_msg_arg *ma;
- shm = tee_shm_alloc(ctx, OPTEE_MSG_GET_ARG_SIZE(num_params),
- TEE_SHM_MAPPED);
+ /*
+ * rpc_arg_count is set to the number of allocated parameters in
+ * the RPC argument struct if a second MSG arg struct is expected.
+ * The second arg struct will then be used for RPC. So far only
+ * enabled when using FF-A as transport layer.
+ */
+ if (optee->rpc_arg_count)
+ sz += OPTEE_MSG_GET_ARG_SIZE(optee->rpc_arg_count);
+
+ shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED);
if (IS_ERR(shm))
return shm;
@@ -674,3 +687,198 @@ int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm)
{
return 0;
}
+
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+static int optee_ffa_yielding_call(struct tee_context *ctx,
+ struct ffa_send_direct_data *data,
+ struct optee_msg_arg *rpc_arg)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
+ struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+ struct optee_call_waiter w;
+ u32 cmd = data->data0;
+ u32 w4 = data->data1;
+ u32 w5 = data->data2;
+ u32 w6 = data->data3;
+ int rc;
+
+ /* Initialize waiter */
+ optee_cq_wait_init(&optee->call_queue, &w);
+ while (true) {
+ rc = ffa_ops->sync_send_receive(ffa_dev, data);
+ if (rc)
+ goto done;
+
+ switch ((int)data->data0) {
+ case TEEC_SUCCESS:
+ break;
+ case TEEC_ERROR_BUSY:
+ if (cmd == OPTEE_FFA_YIELDING_CALL_RESUME) {
+ rc = -EIO;
+ goto done;
+ }
+
+ /*
+ * Out of threads in secure world, wait for a thread
+ * become available.
+ */
+ optee_cq_wait_for_completion(&optee->call_queue, &w);
+ data->data0 = cmd;
+ data->data1 = w4;
+ data->data2 = w5;
+ data->data3 = w6;
+ continue;
+ default:
+ rc = -EIO;
+ goto done;
+ }
+
+ if (data->data1 == OPTEE_FFA_YIELDING_CALL_RETURN_DONE)
+ goto done;
+
+ /*
+ * OP-TEE has returned with a RPC request.
+ *
+ * Note that data->data4 (passed in register w7) is already
+ * filled in by ffa_ops->sync_send_receive() returning
+ * above.
+ */
+ cond_resched();
+ optee_handle_ffa_rpc(ctx, data->data1, rpc_arg);
+ cmd = OPTEE_FFA_YIELDING_CALL_RESUME;
+ data->data0 = cmd;
+ data->data1 = 0;
+ data->data2 = 0;
+ data->data3 = 0;
+ }
+done:
+ /*
+ * We're done with our thread in secure world, if there's any
+ * thread waiters wake up one.
+ */
+ optee_cq_wait_final(&optee->call_queue, &w);
+
+ return rc;
+}
+
+/**
+ * optee_ffa_do_call_with_arg() - Do a FF-A call to enter OP-TEE in secure world
+ * @ctx: calling context
+ * @shm: shared memory holding the message to pass to secure world
+ *
+ * Does a FF-A call to OP-TEE in secure world and handles eventual resulting
+ * Remote Procedure Calls (RPC) from OP-TEE.
+ *
+ * Returns return code from FF-A, 0 is OK
+ */
+
+int optee_ffa_do_call_with_arg(struct tee_context *ctx, struct tee_shm *shm)
+{
+ struct ffa_send_direct_data data = {
+ .data0 = OPTEE_FFA_YIELDING_CALL_WITH_ARG,
+ .data1 = (u32)shm->sec_world_id,
+ .data2 = (u32)(shm->sec_world_id >> 32),
+ .data3 = shm->offset,
+ };
+ struct optee_msg_arg *arg = tee_shm_get_va(shm, 0);
+ unsigned int rpc_arg_offs = OPTEE_MSG_GET_ARG_SIZE(arg->num_params);
+ struct optee_msg_arg *rpc_arg = tee_shm_get_va(shm, rpc_arg_offs);
+
+ return optee_ffa_yielding_call(ctx, &data, rpc_arg);
+}
+
+int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
+ struct page **pages, size_t num_pages,
+ unsigned long start)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
+ struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+ struct ffa_mem_region_attributes mem_attr = {
+ .receiver = ffa_dev->vm_id,
+ .attrs = FFA_MEM_RW,
+ };
+ struct ffa_mem_ops_args args = {
+ .use_txbuf = true,
+ .attrs = &mem_attr,
+ .nattrs = 1,
+ };
+ struct sg_table sgt;
+ int rc;
+
+ rc = check_mem_type(start, num_pages);
+ if (rc)
+ return rc;
+
+ rc = sg_alloc_table_from_pages(&sgt, pages, num_pages, 0,
+ num_pages * PAGE_SIZE, GFP_KERNEL);
+ if (rc)
+ return rc;
+ args.sg = sgt.sgl;
+ rc = ffa_ops->memory_share(ffa_dev, &args);
+ sg_free_table(&sgt);
+ if (rc)
+ return rc;
+
+ rc = optee_shm_add_ffa_handle(optee, shm, args.g_handle);
+ if (rc) {
+ ffa_ops->memory_reclaim(args.g_handle, 0);
+ return rc;
+ }
+
+ shm->sec_world_id = args.g_handle;
+
+ return 0;
+}
+
+int optee_ffa_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
+ struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+ u64 global_handle = shm->sec_world_id;
+ struct ffa_send_direct_data data = {
+ .data0 = OPTEE_FFA_UNREGISTER_SHM,
+ .data1 = (u32)global_handle,
+ .data2 = (u32)(global_handle >> 32)
+ };
+ int rc;
+
+ optee_shm_rem_ffa_handle(optee, global_handle);
+ shm->sec_world_id = 0;
+
+ rc = ffa_ops->sync_send_receive(ffa_dev, &data);
+ if (rc)
+ pr_err("Unregister SHM id 0x%llx rc %d\n", global_handle, rc);
+
+ rc = ffa_ops->memory_reclaim(global_handle, 0);
+ if (rc)
+ pr_err("mem_reclain: 0x%llx %d", global_handle, rc);
+
+ return rc;
+}
+
+int optee_ffa_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
+ u64 global_handle = shm->sec_world_id;
+ int rc;
+
+ /*
+ * We're skipping the OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM call
+ * since this is OP-TEE freeing via RPC so it has already retired
+ * this ID.
+ */
+
+ optee_shm_rem_ffa_handle(optee, global_handle);
+ rc = ffa_ops->memory_reclaim(global_handle, 0);
+ if (rc)
+ pr_err("mem_reclain: 0x%llx %d", global_handle, rc);
+
+ shm->sec_world_id = 0;
+
+ return rc;
+}
+#endif /*CONFIG_ARM_FFA_TRANSPORT*/
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index f689f171a794..cf5eeac4c8b0 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -6,6 +6,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/arm-smccc.h>
+#include <linux/arm_ffa.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/module.h>
@@ -20,6 +21,7 @@
#include <linux/workqueue.h>
#include "optee_private.h"
#include "optee_smc.h"
+#include "optee_ffa.h"
#include "shm_pool.h"
#define DRIVER_NAME "optee"
@@ -299,10 +301,9 @@ static int optee_open(struct tee_context *ctx)
mutex_init(&ctxdata->mutex);
INIT_LIST_HEAD(&ctxdata->sess_list);
- if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
- ctx->cap_memref_null = true;
- else
- ctx->cap_memref_null = false;
+ ctx->cap_memref_null = optee_is_ffa_based(optee) ||
+ (optee->sec_caps &
+ OPTEE_SMC_SEC_CAP_MEMREF_NULL);
ctx->data = ctxdata;
return 0;
@@ -567,6 +568,472 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
return rc;
}
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+static void optee_ffa_get_version(struct tee_device *teedev,
+ struct tee_ioctl_version_data *vers)
+{
+ struct tee_ioctl_version_data v = {
+ .impl_id = TEE_IMPL_ID_OPTEE,
+ .impl_caps = TEE_OPTEE_CAP_TZ,
+ .gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM |
+ TEE_GEN_CAP_MEMREF_NULL,
+ };
+
+ *vers = v;
+}
+
+struct shm_rhash {
+ struct tee_shm *shm;
+ u64 global_id;
+ struct rhash_head linkage;
+};
+
+static void rh_free_fn(void *ptr, void *arg)
+{
+ kfree(ptr);
+}
+
+static const struct rhashtable_params shm_rhash_params = {
+ .head_offset = offsetof(struct shm_rhash, linkage),
+ .key_len = sizeof(u64),
+ .key_offset = offsetof(struct shm_rhash, global_id),
+ .automatic_shrinking = true,
+};
+
+struct tee_shm *optee_shm_from_ffa_handle(struct optee *optee, u64 global_id)
+{
+ struct tee_shm *shm = NULL;
+ struct shm_rhash *r;
+
+ mutex_lock(&optee->ffa.mutex);
+ r = rhashtable_lookup_fast(&optee->ffa.global_ids, &global_id,
+ shm_rhash_params);
+ if (r)
+ shm = r->shm;
+ mutex_unlock(&optee->ffa.mutex);
+
+ return shm;
+}
+
+int optee_shm_add_ffa_handle(struct optee *optee, struct tee_shm *shm,
+ u64 global_id)
+{
+ struct shm_rhash *r;
+ int rc;
+
+ r = kmalloc(sizeof(*r), GFP_KERNEL);
+ if (!r)
+ return -ENOMEM;
+ r->shm = shm;
+ r->global_id = global_id;
+
+ mutex_lock(&optee->ffa.mutex);
+ rc = rhashtable_lookup_insert_fast(&optee->ffa.global_ids, &r->linkage,
+ shm_rhash_params);
+ mutex_unlock(&optee->ffa.mutex);
+
+ if (rc)
+ kfree(r);
+
+ return rc;
+}
+
+int optee_shm_rem_ffa_handle(struct optee *optee, u64 global_id)
+{
+ struct shm_rhash *r;
+ int rc = -ENOENT;
+
+ mutex_lock(&optee->ffa.mutex);
+ r = rhashtable_lookup_fast(&optee->ffa.global_ids, &global_id,
+ shm_rhash_params);
+ if (r)
+ rc = rhashtable_remove_fast(&optee->ffa.global_ids,
+ &r->linkage, shm_rhash_params);
+ mutex_unlock(&optee->ffa.mutex);
+
+ if (!rc)
+ kfree(r);
+
+ return rc;
+}
+
+static void from_msg_param_ffa_mem(struct optee *optee, struct tee_param *p,
+ u32 attr, const struct optee_msg_param *mp)
+{
+ struct tee_shm *shm = NULL;
+ u64 offs_high = 0;
+ u64 offs_low = 0;
+
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
+ attr - OPTEE_MSG_ATTR_TYPE_FMEM_INPUT;
+ p->u.memref.size = mp->u.fmem.size;
+
+ if (mp->u.fmem.global_id != OPTEE_MSG_FMEM_INVALID_GLOBAL_ID)
+ shm = optee_shm_from_ffa_handle(optee, mp->u.fmem.global_id);
+ p->u.memref.shm = shm;
+
+ if (shm) {
+ offs_low = mp->u.fmem.offs_low;
+ offs_high = mp->u.fmem.offs_high;
+ }
+ p->u.memref.shm_offs = offs_low | offs_high << 32;
+}
+
+/**
+ * optee_ffa_from_msg_param() - convert from OPTEE_MSG parameters to
+ * struct tee_param
+ * @optee: main service struct
+ * @params: subsystem internal parameter representation
+ * @num_params: number of elements in the parameter arrays
+ * @msg_params: OPTEE_MSG parameters
+ *
+ * Returns 0 on success or <0 on failure
+ */
+static int optee_ffa_from_msg_param(struct optee *optee,
+ struct tee_param *params, size_t num_params,
+ const struct optee_msg_param *msg_params)
+{
+ size_t n;
+
+ for (n = 0; n < num_params; n++) {
+ struct tee_param *p = params + n;
+ const struct optee_msg_param *mp = msg_params + n;
+ u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
+
+ switch (attr) {
+ case OPTEE_MSG_ATTR_TYPE_NONE:
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
+ memset(&p->u, 0, sizeof(p->u));
+ break;
+ case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
+ case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
+ case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
+ from_msg_param_value(p, attr, mp);
+ break;
+ case OPTEE_MSG_ATTR_TYPE_FMEM_INPUT:
+ case OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT:
+ case OPTEE_MSG_ATTR_TYPE_FMEM_INOUT:
+ from_msg_param_ffa_mem(optee, p, attr, mp);
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int to_msg_param_ffa_mem(struct optee_msg_param *mp,
+ const struct tee_param *p)
+{
+ struct tee_shm *shm = p->u.memref.shm;
+
+ mp->attr = OPTEE_MSG_ATTR_TYPE_FMEM_INPUT + p->attr -
+ TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
+
+ if (shm) {
+ u64 shm_offs = p->u.memref.shm_offs;
+
+ mp->u.fmem.internal_offs = shm->offset;
+
+ mp->u.fmem.offs_low = shm_offs;
+ mp->u.fmem.offs_high = shm_offs >> 32;
+ /* Check that the entire offset could be stored. */
+ if (mp->u.fmem.offs_high != shm_offs >> 32)
+ return -EINVAL;
+
+ mp->u.fmem.global_id = shm->sec_world_id;
+ } else {
+ memset(&mp->u, 0, sizeof(mp->u));
+ mp->u.fmem.global_id = OPTEE_MSG_FMEM_INVALID_GLOBAL_ID;
+ }
+ mp->u.fmem.size = p->u.memref.size;
+
+ return 0;
+}
+
+/**
+ * optee_ffa_to_msg_param() - convert from struct tee_params to OPTEE_MSG
+ * parameters
+ * @optee: main service struct
+ * @msg_params: OPTEE_MSG parameters
+ * @num_params: number of elements in the parameter arrays
+ * @params: subsystem itnernal parameter representation
+ * Returns 0 on success or <0 on failure
+ */
+static int optee_ffa_to_msg_param(struct optee *optee,
+ struct optee_msg_param *msg_params,
+ size_t num_params,
+ const struct tee_param *params)
+{
+ size_t n;
+
+ for (n = 0; n < num_params; n++) {
+ const struct tee_param *p = params + n;
+ struct optee_msg_param *mp = msg_params + n;
+
+ switch (p->attr) {
+ case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
+ mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
+ memset(&mp->u, 0, sizeof(mp->u));
+ break;
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
+ to_msg_param_value(mp, p);
+ break;
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
+ if (to_msg_param_ffa_mem(mp, p))
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
+ const struct ffa_dev_ops *ops)
+{
+ struct ffa_send_direct_data data = { OPTEE_FFA_GET_API_VERSION };
+ int rc;
+
+ ops->mode_32bit_set(ffa_dev);
+
+ rc = ops->sync_send_receive(ffa_dev, &data);
+ if (rc) {
+ pr_err("Unexpected error %d\n", rc);
+ return false;
+ }
+ if (data.data0 != OPTEE_FFA_VERSION_MAJOR ||
+ data.data1 < OPTEE_FFA_VERSION_MINOR) {
+ pr_err("Incompatible OP-TEE API version %lu.%lu",
+ data.data0, data.data1);
+ return false;
+ }
+
+ data = (struct ffa_send_direct_data){ OPTEE_FFA_GET_OS_VERSION };
+ rc = ops->sync_send_receive(ffa_dev, &data);
+ if (rc) {
+ pr_err("Unexpected error %d\n", rc);
+ return false;
+ }
+ if (data.data2)
+ pr_info("revision %lu.%lu (%08lx)",
+ data.data0, data.data1, data.data2);
+ else
+ pr_info("revision %lu.%lu", data.data0, data.data1);
+
+ return true;
+}
+
+static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev,
+ const struct ffa_dev_ops *ops,
+ u32 *sec_caps, unsigned int *rpc_arg_count)
+{
+ struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES };
+ int rc;
+
+ rc = ops->sync_send_receive(ffa_dev, &data);
+ if (rc) {
+ pr_err("Unexpected error %d", rc);
+ return false;
+ }
+ if (data.data0) {
+ pr_err("Unexpected exchange error %lu", data.data0);
+ return false;
+ }
+
+ *sec_caps = 0;
+ *rpc_arg_count = (u8)data.data1;
+
+ return true;
+}
+
+static struct tee_shm_pool *optee_ffa_config_dyn_shm(void)
+{
+ struct tee_shm_pool_mgr *priv_mgr;
+ struct tee_shm_pool_mgr *dmabuf_mgr;
+ void *rc;
+
+ rc = optee_ffa_shm_pool_alloc_pages();
+ if (IS_ERR(rc))
+ return rc;
+ priv_mgr = rc;
+
+ rc = optee_ffa_shm_pool_alloc_pages();
+ if (IS_ERR(rc)) {
+ tee_shm_pool_mgr_destroy(priv_mgr);
+ return rc;
+ }
+ dmabuf_mgr = rc;
+
+ rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
+ if (IS_ERR(rc)) {
+ tee_shm_pool_mgr_destroy(priv_mgr);
+ tee_shm_pool_mgr_destroy(dmabuf_mgr);
+ }
+
+ return rc;
+}
+
+static const struct tee_driver_ops optee_ffa_clnt_ops = {
+ .get_version = optee_ffa_get_version,
+ .open = optee_open,
+ .release = optee_release,
+ .open_session = optee_open_session,
+ .close_session = optee_close_session,
+ .invoke_func = optee_invoke_func,
+ .cancel_req = optee_cancel_req,
+ .shm_register = optee_ffa_shm_register,
+ .shm_unregister = optee_ffa_shm_unregister,
+};
+
+static const struct tee_desc optee_ffa_clnt_desc = {
+ .name = DRIVER_NAME "ffa-clnt",
+ .ops = &optee_ffa_clnt_ops,
+ .owner = THIS_MODULE,
+};
+
+static const struct tee_driver_ops optee_ffa_supp_ops = {
+ .get_version = optee_ffa_get_version,
+ .open = optee_open,
+ .release = optee_release_supp,
+ .supp_recv = optee_supp_recv,
+ .supp_send = optee_supp_send,
+ .shm_register = optee_ffa_shm_register, /* same as for clnt ops */
+ .shm_unregister = optee_ffa_shm_unregister_supp,
+};
+
+static const struct tee_desc optee_ffa_supp_desc = {
+ .name = DRIVER_NAME "ffa-supp",
+ .ops = &optee_ffa_supp_ops,
+ .owner = THIS_MODULE,
+ .flags = TEE_DESC_PRIVILEGED,
+};
+
+static const struct optee_ops optee_ffa_ops = {
+ .do_call_with_arg = optee_ffa_do_call_with_arg,
+ .to_msg_param = optee_ffa_to_msg_param,
+ .from_msg_param = optee_ffa_from_msg_param,
+};
+
+static void optee_ffa_remove(struct ffa_device *ffa_dev)
+{
+ (void)ffa_dev;
+}
+
+static int optee_ffa_probe(struct ffa_device *ffa_dev)
+{
+ const struct ffa_dev_ops *ffa_ops;
+ unsigned int rpc_arg_count;
+ struct tee_device *teedev;
+ struct optee *optee;
+ u32 sec_caps;
+ int rc;
+
+ ffa_ops = ffa_dev_ops_get(ffa_dev);
+ if (!ffa_ops) {
+ pr_warn("failed \"method\" init: ffa\n");
+ return -ENOENT;
+ }
+
+ if (!optee_ffa_api_is_compatbile(ffa_dev, ffa_ops))
+ return -EINVAL;
+
+ if (!optee_ffa_exchange_caps(ffa_dev, ffa_ops, &sec_caps,
+ &rpc_arg_count))
+ return -EINVAL;
+
+ optee = kzalloc(sizeof(*optee), GFP_KERNEL);
+ if (!optee) {
+ rc = -ENOMEM;
+ goto err;
+ }
+ optee->pool = optee_ffa_config_dyn_shm();
+ if (IS_ERR(optee->pool)) {
+ rc = PTR_ERR(optee->pool);
+ optee->pool = NULL;
+ goto err;
+ }
+
+ optee->ops = &optee_ffa_ops;
+ optee->ffa.ffa_dev = ffa_dev;
+ optee->ffa.ffa_ops = ffa_ops;
+ optee->sec_caps = sec_caps;
+ optee->rpc_arg_count = rpc_arg_count;
+
+ teedev = tee_device_alloc(&optee_ffa_clnt_desc, NULL, optee->pool,
+ optee);
+ if (IS_ERR(teedev)) {
+ rc = PTR_ERR(teedev);
+ goto err;
+ }
+ optee->teedev = teedev;
+
+ teedev = tee_device_alloc(&optee_ffa_supp_desc, NULL, optee->pool,
+ optee);
+ if (IS_ERR(teedev)) {
+ rc = PTR_ERR(teedev);
+ goto err;
+ }
+ optee->supp_teedev = teedev;
+
+ rc = tee_device_register(optee->teedev);
+ if (rc)
+ goto err;
+
+ rc = tee_device_register(optee->supp_teedev);
+ if (rc)
+ goto err;
+
+ rc = rhashtable_init(&optee->ffa.global_ids, &shm_rhash_params);
+ if (rc)
+ goto err;
+ mutex_init(&optee->ffa.mutex);
+ mutex_init(&optee->call_queue.mutex);
+ INIT_LIST_HEAD(&optee->call_queue.waiters);
+ optee_wait_queue_init(&optee->wait_queue);
+ optee_supp_init(&optee->supp);
+ ffa_dev_set_drvdata(ffa_dev, optee);
+
+ pr_info("initialized driver\n");
+ return 0;
+err:
+ /*
+ * tee_device_unregister() is safe to call even if the
+ * devices hasn't been registered with
+ * tee_device_register() yet.
+ */
+ tee_device_unregister(optee->supp_teedev);
+ tee_device_unregister(optee->teedev);
+ if (optee->pool)
+ tee_shm_pool_free(optee->pool);
+ kfree(optee);
+ return rc;
+}
+
+static const struct ffa_device_id optee_ffa_device_id[] = {
+ /* 486178e0-e7f8-11e3-bc5e0002a5d5c51b */
+ { UUID_INIT(0x486178e0, 0xe7f8, 0x11e3,
+ 0xbc, 0x5e, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b) },
+ {}
+};
+
+static struct ffa_driver optee_ffa_driver = {
+ .name = "optee",
+ .probe = optee_ffa_probe,
+ .remove = optee_ffa_remove,
+ .id_table = optee_ffa_device_id,
+};
+
+module_ffa_driver(optee_ffa_driver);
+#endif /*CONFIG_ARM_FFA_TRANSPORT*/
+
/* Simple wrapper functions to be able to use a function pointer */
static void optee_smccc_smc(unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3,
@@ -615,7 +1082,8 @@ static int optee_remove(struct platform_device *pdev)
* reference counters and also avoid wild pointers in secure world
* into the old shared memory range.
*/
- optee_disable_shm_cache(optee);
+ if (!optee_is_ffa_based(optee))
+ optee_disable_shm_cache(optee);
/*
* The two devices have to be unregistered before we can free the
@@ -631,6 +1099,14 @@ static int optee_remove(struct platform_device *pdev)
optee_supp_uninit(&optee->supp);
mutex_destroy(&optee->call_queue.mutex);
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+ if (optee->ffa.ffa_ops) {
+ mutex_destroy(&optee->ffa.mutex);
+ rhashtable_free_and_destroy(&optee->ffa.global_ids,
+ rh_free_fn, NULL);
+ }
+#endif /*CONFIG_ARM_FFA_TRANSPORT*/
+
kfree(optee);
return 0;
diff --git a/drivers/tee/optee/optee_ffa.h b/drivers/tee/optee/optee_ffa.h
new file mode 100644
index 000000000000..ee3a03fc392c
--- /dev/null
+++ b/drivers/tee/optee/optee_ffa.h
@@ -0,0 +1,153 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (c) 2019-2021, Linaro Limited
+ */
+
+/*
+ * This file is exported by OP-TEE and is kept in sync between secure world
+ * and normal world drivers. We're using ARM FF-A 1.0 specification.
+ */
+
+#ifndef __OPTEE_FFA_H
+#define __OPTEE_FFA_H
+
+#include <linux/arm_ffa.h>
+
+/*
+ * Normal world sends requests with FFA_MSG_SEND_DIRECT_REQ and
+ * responses are returned with FFA_MSG_SEND_DIRECT_RESP for normal
+ * messages.
+ *
+ * All requests with FFA_MSG_SEND_DIRECT_REQ and FFA_MSG_SEND_DIRECT_RESP
+ * are using the AArch32 SMC calling convention with register usage as
+ * defined in FF-A specification:
+ * w0: Function ID (0x8400006F or 0x84000070)
+ * w1: Source/Destination IDs
+ * w2: Reserved (MBZ)
+ * w3-w7: Implementation defined, free to be used below
+ */
+
+#define OPTEE_FFA_VERSION_MAJOR 1
+#define OPTEE_FFA_VERSION_MINOR 0
+
+#define OPTEE_FFA_BLOCKING_CALL(id) (id)
+#define OPTEE_FFA_YIELDING_CALL_BIT 31
+#define OPTEE_FFA_YIELDING_CALL(id) ((id) | BIT(OPTEE_FFA_YIELDING_CALL_BIT))
+
+/*
+ * Returns the API version implemented, currently follows the FF-A version.
+ * Call register usage:
+ * w3: Service ID, OPTEE_FFA_GET_API_VERSION
+ * w4-w7: Not used (MBZ)
+ *
+ * Return register usage:
+ * w3: OPTEE_FFA_VERSION_MAJOR
+ * w4: OPTEE_FFA_VERSION_MINOR
+ * w5-w7: Not used (MBZ)
+ */
+#define OPTEE_FFA_GET_API_VERSION OPTEE_FFA_BLOCKING_CALL(0)
+
+/*
+ * Returns the revision of OP-TEE.
+ *
+ * Used by non-secure world to figure out which version of the Trusted OS
+ * is installed. Note that the returned revision is the revision of the
+ * Trusted OS, not of the API.
+ *
+ * Call register usage:
+ * w3: Service ID, OPTEE_FFA_GET_OS_VERSION
+ * w4-w7: Unused (MBZ)
+ *
+ * Return register usage:
+ * w3: CFG_OPTEE_REVISION_MAJOR
+ * w4: CFG_OPTEE_REVISION_MINOR
+ * w5: TEE_IMPL_GIT_SHA1 (or zero if not supported)
+ */
+#define OPTEE_FFA_GET_OS_VERSION OPTEE_FFA_BLOCKING_CALL(1)
+
+/*
+ * Exchange capabilities between normal world and secure world.
+ *
+ * Currently there are no defined capabilities. When features are added new
+ * capabilities may be added.
+ *
+ * Call register usage:
+ * w3: Service ID, OPTEE_FFA_EXCHANGE_CAPABILITIES
+ * w4-w7: Note used (MBZ)
+ *
+ * Return register usage:
+ * w3: Error code, 0 on success
+ * w4: Bit[7:0]: Number of parameters needed for RPC to be supplied
+ * as the second MSG arg struct for
+ * OPTEE_FFA_YIELDING_CALL_WITH_ARG.
+ * Bit[31:8]: Reserved (MBZ)
+ * w5-w7: Note used (MBZ)
+ */
+#define OPTEE_FFA_EXCHANGE_CAPABILITIES OPTEE_FFA_BLOCKING_CALL(2)
+
+/*
+ * Unregister shared memory
+ *
+ * Call register usage:
+ * w3: Service ID, OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM
+ * w4: Shared memory handle, lower bits
+ * w5: Shared memory handle, higher bits
+ * w6-w7: Not used (MBZ)
+ *
+ * Return register usage:
+ * w3: Error code, 0 on success
+ * w4-w7: Note used (MBZ)
+ */
+#define OPTEE_FFA_UNREGISTER_SHM OPTEE_FFA_BLOCKING_CALL(3)
+
+/*
+ * Call with struct optee_msg_arg as argument in the supplied shared memory
+ * with a zero internal offset and normal cached memory attributes.
+ * Register usage:
+ * w3: Service ID, OPTEE_FFA_YIELDING_CALL_WITH_ARG
+ * w4: Lower 32 bits of a 64-bit Shared memory handle
+ * w5: Upper 32 bits of a 64-bit Shared memory handle
+ * w6: Offset into shared memory pointing to a struct optee_msg_arg
+ * right after the parameters of this struct (at offset
+ * OPTEE_MSG_GET_ARG_SIZE(num_params) follows a struct optee_msg_arg
+ * for RPC, this struct has reserved space for the number of RPC
+ * parameters as returned by OPTEE_FFA_EXCHANGE_CAPABILITIES.
+ * w7: Not used (MBZ)
+ * Resume from RPC. Register usage:
+ * w3: Service ID, OPTEE_FFA_YIELDING_CALL_RESUME
+ * w4-w6: Not used (MBZ)
+ * w7: Resume info
+ *
+ * Normal return (yielding call is completed). Register usage:
+ * w3: Error code, 0 on success
+ * w4: OPTEE_FFA_YIELDING_CALL_RETURN_DONE
+ * w5-w7: Not used (MBZ)
+ *
+ * RPC interrupt return (RPC from secure world). Register usage:
+ * w3: Error code == 0
+ * w4: Any defined RPC code but OPTEE_FFA_YIELDING_CALL_RETURN_DONE
+ * w5-w6: Not used (MBZ)
+ * w7: Resume info
+ *
+ * Possible error codes in register w3:
+ * 0: Success
+ * FFA_DENIED: w4 isn't one of OPTEE_FFA_YIELDING_CALL_START
+ * OPTEE_FFA_YIELDING_CALL_RESUME
+ *
+ * Possible error codes for OPTEE_FFA_YIELDING_CALL_START,
+ * FFA_BUSY: Number of OP-TEE OS threads exceeded,
+ * try again later
+ * FFA_DENIED: RPC shared memory object not found
+ * FFA_INVALID_PARAMETER: Bad shared memory handle or offset into the memory
+ *
+ * Possible error codes for OPTEE_FFA_YIELDING_CALL_RESUME
+ * FFA_INVALID_PARAMETER: Bad resume info
+ */
+#define OPTEE_FFA_YIELDING_CALL_WITH_ARG OPTEE_FFA_YIELDING_CALL(0)
+#define OPTEE_FFA_YIELDING_CALL_RESUME OPTEE_FFA_YIELDING_CALL(1)
+
+#define OPTEE_FFA_YIELDING_CALL_RETURN_DONE 0
+#define OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD 1
+#define OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT 2
+
+#endif /*__OPTEE_FFA_H*/
diff --git a/drivers/tee/optee/optee_msg.h b/drivers/tee/optee/optee_msg.h
index 81ff593ac4ec..813e791a61e6 100644
--- a/drivers/tee/optee/optee_msg.h
+++ b/drivers/tee/optee/optee_msg.h
@@ -28,6 +28,9 @@
#define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT 0x5
#define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT 0x6
#define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT 0x7
+#define OPTEE_MSG_ATTR_TYPE_FMEM_INPUT OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
+#define OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT
+#define OPTEE_MSG_ATTR_TYPE_FMEM_INOUT OPTEE_MSG_ATTR_TYPE_RMEM_INOUT
#define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT 0x9
#define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT 0xa
#define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT 0xb
@@ -96,6 +99,8 @@
*/
#define OPTEE_MSG_NONCONTIG_PAGE_SIZE 4096
+#define OPTEE_MSG_FMEM_INVALID_GLOBAL_ID 0xffffffffffffffff
+
/**
* struct optee_msg_param_tmem - temporary memory reference parameter
* @buf_ptr: Address of the buffer
@@ -127,6 +132,23 @@ struct optee_msg_param_rmem {
u64 shm_ref;
};
+/**
+ * struct optee_msg_param_fmem - ffa memory reference parameter
+ * @offs_lower: Lower bits of offset into shared memory reference
+ * @offs_upper: Upper bits of offset into shared memory reference
+ * @internal_offs: Internal offset into the first page of shared memory
+ * reference
+ * @size: Size of the buffer
+ * @global_id: Global identifier of Shared memory
+ */
+struct optee_msg_param_fmem {
+ u32 offs_low;
+ u16 offs_high;
+ u16 internal_offs;
+ u64 size;
+ u64 global_id;
+};
+
/**
* struct optee_msg_param_value - opaque value parameter
*
@@ -143,12 +165,14 @@ struct optee_msg_param_value {
* @attr: attributes
* @tmem: parameter by temporary memory reference
* @rmem: parameter by registered memory reference
+ * @fmem: parameter by ffa registered memory reference
* @value: parameter by opaque value
*
* @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in
* the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value,
* OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and
- * OPTEE_MSG_ATTR_TYPE_RMEM_* indicates @rmem,
+ * OPTEE_MSG_ATTR_TYPE_RMEM_* or the alias PTEE_MSG_ATTR_TYPE_FMEM_* indicates
+ * @rmem or @fmem depending on the conduit.
* OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
*/
struct optee_msg_param {
@@ -156,6 +180,7 @@ struct optee_msg_param {
union {
struct optee_msg_param_tmem tmem;
struct optee_msg_param_rmem rmem;
+ struct optee_msg_param_fmem fmem;
struct optee_msg_param_value value;
} u;
};
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index c5741e96e967..1ffe74e66d15 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -7,6 +7,7 @@
#define OPTEE_PRIVATE_H
#include <linux/arm-smccc.h>
+#include <linux/rhashtable.h>
#include <linux/semaphore.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
@@ -20,6 +21,7 @@
#define TEEC_ERROR_NOT_SUPPORTED 0xFFFF000A
#define TEEC_ERROR_COMMUNICATION 0xFFFF000E
#define TEEC_ERROR_OUT_OF_MEMORY 0xFFFF000C
+#define TEEC_ERROR_BUSY 0xFFFF000D
#define TEEC_ERROR_SHORT_BUFFER 0xFFFF0010
#define TEEC_ORIGIN_COMMS 0x00000002
@@ -66,6 +68,22 @@ struct optee_supp {
struct completion reqs_c;
};
+/**
+ * struct optee_ffa_data - FFA communication struct
+ * @ffa_dev FFA device, contains the destination id, the id of
+ * OP-TEE in secure world
+ * @ffa_ops FFA operations
+ * @mutex Serializes access to @global_ids
+ * @global_ids FF-A shared memory global handle translation
+ */
+struct optee_ffa {
+ struct ffa_device *ffa_dev;
+ const struct ffa_dev_ops *ffa_ops;
+ /* Serializes access to @global_ids */
+ struct mutex mutex;
+ struct rhashtable global_ids;
+};
+
struct optee;
/**
@@ -113,11 +131,15 @@ struct optee {
struct tee_device *teedev;
const struct optee_ops *ops;
optee_invoke_fn *invoke_fn;
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+ struct optee_ffa ffa;
+#endif
struct optee_call_queue call_queue;
struct optee_wait_queue wait_queue;
struct optee_supp supp;
struct tee_shm_pool *pool;
void *memremaped_shm;
+ unsigned int rpc_arg_count;
u32 sec_caps;
bool scan_bus_done;
struct workqueue_struct *scan_bus_wq;
@@ -206,6 +228,36 @@ void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
#define PTA_CMD_GET_DEVICES_SUPP 0x1
int optee_enumerate_devices(u32 func);
+int optee_shm_add_ffa_handle(struct optee *optee, struct tee_shm *shm,
+ u64 global_id);
+int optee_shm_rem_ffa_handle(struct optee *optee, u64 global_id);
+
+struct tee_shm *optee_shm_from_ffa_handle(struct optee *optee, u64 global_id);
+
+int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
+ struct page **pages, size_t num_pages,
+ unsigned long start);
+int optee_ffa_shm_unregister(struct tee_context *ctx, struct tee_shm *shm);
+int optee_ffa_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
+ struct page **pages, size_t num_pages,
+ unsigned long start);
+int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
+ struct tee_shm *shm);
+
+int optee_ffa_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg);
+int optee_ffa_rpc_shm_register(struct tee_context *ctx, struct tee_shm *shm);
+void optee_handle_ffa_rpc(struct tee_context *ctx, u32 cmd,
+ struct optee_msg_arg *arg);
+
+static inline bool optee_is_ffa_based(struct optee *optee)
+{
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+ return optee->ffa.ffa_ops;
+#else
+ return false;
+#endif
+}
+
/*
* Small helpers
*/
diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c
index 39562fb6841e..865a9ab3cf65 100644
--- a/drivers/tee/optee/rpc.c
+++ b/drivers/tee/optee/rpc.c
@@ -10,6 +10,7 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
+#include "optee_ffa.h"
#include "optee_private.h"
#include "optee_smc.h"
#include "optee_rpc_cmd.h"
@@ -543,3 +544,120 @@ void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
}
+
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+static void handle_ffa_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
+ struct optee_msg_arg *arg)
+{
+ struct tee_shm *shm;
+
+ if (arg->num_params != 1 ||
+ arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+ return;
+ }
+
+ switch (arg->params[0].u.value.a) {
+ case OPTEE_RPC_SHM_TYPE_APPL:
+ shm = cmd_alloc_suppl(ctx, arg->params[0].u.value.b);
+ break;
+ case OPTEE_RPC_SHM_TYPE_KERNEL:
+ shm = tee_shm_alloc(ctx, arg->params[0].u.value.b,
+ TEE_SHM_MAPPED);
+ break;
+ default:
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+ return;
+ }
+
+ if (IS_ERR(shm)) {
+ arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
+ return;
+ }
+
+ arg->params[0] = (struct optee_msg_param){
+ .attr = OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT,
+ .u.fmem.size = tee_shm_get_size(shm),
+ .u.fmem.global_id = shm->sec_world_id,
+ .u.fmem.internal_offs = shm->offset,
+ };
+
+ arg->ret = TEEC_SUCCESS;
+}
+
+static void handle_ffa_rpc_func_cmd_shm_free(struct tee_context *ctx,
+ struct optee *optee,
+ struct optee_msg_arg *arg)
+{
+ struct tee_shm *shm;
+
+ if (arg->num_params != 1 ||
+ arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
+ goto err_bad_param;
+
+ shm = optee_shm_from_ffa_handle(optee, arg->params[0].u.value.b);
+ if (!shm)
+ goto err_bad_param;
+ switch (arg->params[0].u.value.a) {
+ case OPTEE_RPC_SHM_TYPE_APPL:
+ cmd_free_suppl(ctx, shm);
+ break;
+ case OPTEE_RPC_SHM_TYPE_KERNEL:
+ tee_shm_free(shm);
+ break;
+ default:
+ goto err_bad_param;
+ }
+ arg->ret = TEEC_SUCCESS;
+ return;
+
+err_bad_param:
+ arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+}
+
+static void handle_ffa_rpc_func_cmd(struct tee_context *ctx,
+ struct optee_msg_arg *arg)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+
+ arg->ret_origin = TEEC_ORIGIN_COMMS;
+ switch (arg->cmd) {
+ case OPTEE_RPC_CMD_GET_TIME:
+ handle_rpc_func_cmd_get_time(arg);
+ break;
+ case OPTEE_RPC_CMD_WAIT_QUEUE:
+ handle_rpc_func_cmd_wq(optee, arg);
+ break;
+ case OPTEE_RPC_CMD_SUSPEND:
+ handle_rpc_func_cmd_wait(arg);
+ break;
+ case OPTEE_RPC_CMD_SHM_ALLOC:
+ handle_ffa_rpc_func_cmd_shm_alloc(ctx, arg);
+ break;
+ case OPTEE_RPC_CMD_SHM_FREE:
+ handle_ffa_rpc_func_cmd_shm_free(ctx, optee, arg);
+ break;
+ case OPTEE_RPC_CMD_I2C_TRANSFER:
+ handle_rpc_func_cmd_i2c_transfer(ctx, arg);
+ break;
+ default:
+ handle_rpc_supp_cmd(ctx, optee, arg);
+ }
+}
+
+void optee_handle_ffa_rpc(struct tee_context *ctx, u32 cmd,
+ struct optee_msg_arg *arg)
+{
+ switch (cmd) {
+ case OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD:
+ handle_ffa_rpc_func_cmd(ctx, arg);
+ break;
+ case OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT:
+ /* Interrupt delivered by now */
+ break;
+ default:
+ pr_warn("Unknown RPC func 0x%x\n", cmd);
+ break;
+ }
+}
+#endif /*CONFIG_ARM_FFA_TRANSPORT*/
--
2.25.1