Adds the secure capability OPTEE_FFA_SEC_CAP_ARG_OFFSET to indicate that OP-TEE with FF-A can support an argument struct at a non-zero offset into a passed shared memory object.
Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/ffa_abi.c | 17 +++++++++++++++-- drivers/tee/optee/optee_ffa.h | 12 +++++++++++- 2 files changed, 26 insertions(+), 3 deletions(-)
diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c index 7686f7020616..cc863aaefcd9 100644 --- a/drivers/tee/optee/ffa_abi.c +++ b/drivers/tee/optee/ffa_abi.c @@ -615,12 +615,21 @@ static int optee_ffa_do_call_with_arg(struct tee_context *ctx, .data0 = OPTEE_FFA_YIELDING_CALL_WITH_ARG, .data1 = (u32)shm->sec_world_id, .data2 = (u32)(shm->sec_world_id >> 32), - .data3 = shm->offset, + .data3 = 0, }; struct optee_msg_arg *arg; unsigned int rpc_arg_offs; struct optee_msg_arg *rpc_arg;
+ /* + * The shared memory object has to start on a page when passed as + * an argument struct. This is also what the shm pool allocator + * returns, but check this before calling secure world to catch + * eventual errors early in case something changes. + */ + if (shm->offset) + return -EINVAL; + arg = tee_shm_get_va(shm, 0); if (IS_ERR(arg)) return PTR_ERR(arg); @@ -678,6 +687,7 @@ static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev, const struct ffa_dev_ops *ops, + u32 *sec_caps, unsigned int *rpc_param_count) { struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES }; @@ -694,6 +704,7 @@ static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev, }
*rpc_param_count = (u8)data.data1; + *sec_caps = data.data2;
return true; } @@ -777,6 +788,7 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev) struct tee_device *teedev; struct tee_context *ctx; struct optee *optee; + u32 sec_caps; int rc;
ffa_ops = ffa_dev_ops_get(ffa_dev); @@ -788,7 +800,8 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev) if (!optee_ffa_api_is_compatbile(ffa_dev, ffa_ops)) return -EINVAL;
- if (!optee_ffa_exchange_caps(ffa_dev, ffa_ops, &rpc_param_count)) + if (!optee_ffa_exchange_caps(ffa_dev, ffa_ops, &sec_caps, + &rpc_param_count)) return -EINVAL;
optee = kzalloc(sizeof(*optee), GFP_KERNEL); diff --git a/drivers/tee/optee/optee_ffa.h b/drivers/tee/optee/optee_ffa.h index ee3a03fc392c..97266243deaa 100644 --- a/drivers/tee/optee/optee_ffa.h +++ b/drivers/tee/optee/optee_ffa.h @@ -81,8 +81,16 @@ * as the second MSG arg struct for * OPTEE_FFA_YIELDING_CALL_WITH_ARG. * Bit[31:8]: Reserved (MBZ) - * w5-w7: Note used (MBZ) + * w5: Bitfield of secure world capabilities OPTEE_FFA_SEC_CAP_* below, + * unused bits MBZ. + * w6-w7: Not used (MBZ) + */ +/* + * Secure world supports giving an offset into the argument shared memory + * object, see also OPTEE_FFA_YIELDING_CALL_WITH_ARG */ +#define OPTEE_FFA_SEC_CAP_ARG_OFFSET BIT(0) + #define OPTEE_FFA_EXCHANGE_CAPABILITIES OPTEE_FFA_BLOCKING_CALL(2)
/* @@ -112,6 +120,8 @@ * 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. + * MBZ unless the bit OPTEE_FFA_SEC_CAP_ARG_OFFSET is received with + * OPTEE_FFA_EXCHANGE_CAPABILITIES. * w7: Not used (MBZ) * Resume from RPC. Register usage: * w3: Service ID, OPTEE_FFA_YIELDING_CALL_RESUME