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tee: add bus driver framework for TEE based devices

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Introduce a generic TEE bus driver concept for TEE based kernel drivers
which would like to communicate with TEE based devices/services. Also
add support in module device table for these new TEE based devices.

In this TEE bus concept, devices/services are identified via Universally
Unique Identifier (UUID) and drivers register a table of device UUIDs
which they can support.

So this TEE bus framework registers following apis:
- match(): Iterates over the driver UUID table to find a corresponding
  match for device UUID. If a match is found, then this particular device
  is probed via corresponding probe api registered by the driver. This
  process happens whenever a device or a driver is registered with TEE
  bus.
- uevent(): Notifies user-space (udev) whenever a new device is registered
  on this bus for auto-loading of modularized drivers.

Also this framework allows for device enumeration to be specific to
corresponding TEE implementation like OP-TEE etc.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Bhupesh Sharma <bhsharma@redhat.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Sumit Garg
2019-01-29 11:19:35 +05:30
committed by Jens Wiklander
parent 42bf4152d8
commit 0fc1db9d10
5 changed files with 112 additions and 5 deletions
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19
scripts/mod/file2alias.c
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@@ -37,6 +37,9 @@ typedef unsigned char __u8;
typedef struct {
__u8 b[16];
} uuid_le;
typedef struct {
__u8 b[16];
} uuid_t;
/* Big exception to the "don't include kernel headers into userspace, which
* even potentially has different endianness and word sizes, since
@@ -1287,6 +1290,21 @@ static int do_typec_entry(const char *filename, void *symval, char *alias)
return 1;
}
/* Looks like: tee:uuid */
static int do_tee_entry(const char *filename, void *symval, char *alias)
{
DEF_FIELD(symval, tee_client_device_id, uuid);
sprintf(alias, "tee:%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
uuid.b[0], uuid.b[1], uuid.b[2], uuid.b[3], uuid.b[4],
uuid.b[5], uuid.b[6], uuid.b[7], uuid.b[8], uuid.b[9],
uuid.b[10], uuid.b[11], uuid.b[12], uuid.b[13], uuid.b[14],
uuid.b[15]);
add_wildcard(alias);
return 1;
}
/* Does namelen bytes of name exactly match the symbol? */
static bool sym_is(const char *name, unsigned namelen, const char *symbol)
{
@@ -1357,6 +1375,7 @@ static const struct devtable devtable[] = {
{"fslmc", SIZE_fsl_mc_device_id, do_fsl_mc_entry},
{"tbsvc", SIZE_tb_service_id, do_tbsvc_entry},
{"typec", SIZE_typec_device_id, do_typec_entry},
{"tee", SIZE_tee_client_device_id, do_tee_entry},
};
/* Create MODULE_ALIAS() statements.