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| author | Jens Wiklander <jens.wiklander@linaro.org> | 2021-06-15 23:23:54 +0300 |
|---|---|---|
| committer | Jens Wiklander <jens.wiklander@linaro.org> | 2021-11-17 16:08:57 +0300 |
| commit | 6749e69c4dadd352bdfdb306513aa48cc15fbdd6 (patch) | |
| tree | eb89ef076b0ec295b78866d6f7f7225e7df1007d /drivers/tee/optee/optee_private.h | |
| parent | 787c80cc7b22804aa370f04a19f9fe0fa98b1e49 (diff) | |
| download | linux-6749e69c4dadd352bdfdb306513aa48cc15fbdd6.tar.xz | |
optee: add asynchronous notifications
Adds support for asynchronous notifications from secure world to normal
world. This allows a design with a top half and bottom half type of
driver where the top half runs in secure interrupt context and a
notifications tells normal world to schedule a yielding call to do the
bottom half processing.
The protocol is defined in optee_msg.h optee_rpc_cmd.h and optee_smc.h.
A notification consists of a 32-bit value which normal world can
retrieve using a fastcall into secure world. The value
OPTEE_SMC_ASYNC_NOTIF_VALUE_DO_BOTTOM_HALF (0) has a special meaning.
When this value is sent it means that normal world is supposed to make a
yielding call OPTEE_MSG_CMD_DO_BOTTOM_HALF.
Notification capability is negotiated while the driver is initialized.
If both sides supports these notifications then they are enabled.
An interrupt is used to notify the driver that there are asynchronous
notifications pending. The maximum needed notification value is
communicated at this stage. This allows scaling up when needed.
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee/optee/optee_private.h')
| -rw-r--r-- | drivers/tee/optee/optee_private.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h index 68fd28f8c6e9..46f74ab07c7e 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -53,6 +53,7 @@ struct optee_call_queue { struct optee_notif { u_int max_key; + struct tee_context *ctx; /* Serializes access to the elements below in this struct */ spinlock_t lock; struct list_head db; @@ -88,6 +89,7 @@ struct optee_smc { optee_invoke_fn *invoke_fn; void *memremaped_shm; u32 sec_caps; + unsigned int notif_irq; }; /** |