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tpm_ffa_crb: access tpm service over FF-A direct message request v2

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For secure partition with multi service, tpm_ffa_crb can access tpm
service with direct message request v2 interface according to chapter 3.3,
TPM Service Command Response Buffer Interface Over FF-A specificationi v1.0 BET.

This patch reflects this spec to access tpm service over
FF-A direct message request v2 ABI.

Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Yeoreum Yun 2025-04-15 19:50:12 +01:00 committed by Jarkko Sakkinen
parent 8dc9c078ab
commit a85b55ee64
1 changed files with 39 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
drivers/char/tpm/tpm_crb_ffa.c
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@ -105,7 +105,10 @@ struct tpm_crb_ffa {
u16 minor_version;
/* lock to protect sending of FF-A messages: */
struct mutex msg_data_lock;
struct ffa_send_direct_data direct_msg_data;
union {
struct ffa_send_direct_data direct_msg_data;
struct ffa_send_direct_data2 direct_msg_data2;
};
};
static struct tpm_crb_ffa *tpm_crb_ffa;
@ -185,18 +188,34 @@ static int __tpm_crb_ffa_send_recieve(unsigned long func_id,
msg_ops = tpm_crb_ffa->ffa_dev->ops->msg_ops;
memset(&tpm_crb_ffa->direct_msg_data, 0x00,
sizeof(struct ffa_send_direct_data));
if (ffa_partition_supports_direct_req2_recv(tpm_crb_ffa->ffa_dev)) {
memset(&tpm_crb_ffa->direct_msg_data2, 0x00,
sizeof(struct ffa_send_direct_data2));
tpm_crb_ffa->direct_msg_data.data1 = func_id;
tpm_crb_ffa->direct_msg_data.data2 = a0;
tpm_crb_ffa->direct_msg_data.data3 = a1;
tpm_crb_ffa->direct_msg_data.data4 = a2;
tpm_crb_ffa->direct_msg_data2.data[0] = func_id;
tpm_crb_ffa->direct_msg_data2.data[1] = a0;
tpm_crb_ffa->direct_msg_data2.data[2] = a1;
tpm_crb_ffa->direct_msg_data2.data[3] = a2;
ret = msg_ops->sync_send_receive2(tpm_crb_ffa->ffa_dev,
&tpm_crb_ffa->direct_msg_data2);
if (!ret)
ret = tpm_crb_ffa_to_linux_errno(tpm_crb_ffa->direct_msg_data2.data[0]);
} else {
memset(&tpm_crb_ffa->direct_msg_data, 0x00,
sizeof(struct ffa_send_direct_data));
tpm_crb_ffa->direct_msg_data.data1 = func_id;
tpm_crb_ffa->direct_msg_data.data2 = a0;
tpm_crb_ffa->direct_msg_data.data3 = a1;
tpm_crb_ffa->direct_msg_data.data4 = a2;
ret = msg_ops->sync_send_receive(tpm_crb_ffa->ffa_dev,
&tpm_crb_ffa->direct_msg_data);
if (!ret)
ret = tpm_crb_ffa_to_linux_errno(tpm_crb_ffa->direct_msg_data.data1);
}
ret = msg_ops->sync_send_receive(tpm_crb_ffa->ffa_dev,
&tpm_crb_ffa->direct_msg_data);
if (!ret)
ret = tpm_crb_ffa_to_linux_errno(tpm_crb_ffa->direct_msg_data.data1);
return ret;
}
@ -231,8 +250,13 @@ int tpm_crb_ffa_get_interface_version(u16 *major, u16 *minor)
rc = __tpm_crb_ffa_send_recieve(CRB_FFA_GET_INTERFACE_VERSION, 0x00, 0x00, 0x00);
if (!rc) {
*major = CRB_FFA_MAJOR_VERSION(tpm_crb_ffa->direct_msg_data.data2);
*minor = CRB_FFA_MINOR_VERSION(tpm_crb_ffa->direct_msg_data.data2);
if (ffa_partition_supports_direct_req2_recv(tpm_crb_ffa->ffa_dev)) {
*major = CRB_FFA_MAJOR_VERSION(tpm_crb_ffa->direct_msg_data2.data[1]);
*minor = CRB_FFA_MINOR_VERSION(tpm_crb_ffa->direct_msg_data2.data[1]);
} else {
*major = CRB_FFA_MAJOR_VERSION(tpm_crb_ffa->direct_msg_data.data2);
*minor = CRB_FFA_MINOR_VERSION(tpm_crb_ffa->direct_msg_data.data2);
}
}
return rc;
@ -277,7 +301,8 @@ static int tpm_crb_ffa_probe(struct ffa_device *ffa_dev)
tpm_crb_ffa = ERR_PTR(-ENODEV); // set tpm_crb_ffa so we can detect probe failure
if (!ffa_partition_supports_direct_recv(ffa_dev)) {
if (!ffa_partition_supports_direct_recv(ffa_dev) &&
!ffa_partition_supports_direct_req2_recv(ffa_dev)) {
pr_err("TPM partition doesn't support direct message receive.\n");
return -EINVAL;
}