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3360b08817
PCC command execution can time out when a fast platform completes a
transaction and signals the platform interrupt before pcc_send_data()
marks the channel as in use. For shared platform interrupts, the type 3
handler uses chan_in_use to decide whether the interrupt belongs to the
channel. If it observes false, it ignores the completion and the caller
waits until timeout.
Publish chan_in_use before ringing the doorbell. Use WRITE_ONCE() for
the lockless flag updates and READ_ONCE() in the interrupt handler. The
following ordered I/O accessor orders the flag store before the platform
is notified.
Clear chan_in_use if ringing the doorbell fails. Otherwise, leave it set
until the interrupt handler completes the transaction, clearing it before
the mailbox core can submit another transfer.
Fixes: 3db174e478 ("mailbox: pcc: Support shared interrupt for multiple subspaces")
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
Tested-by: Adam Young <admiyo@os.amperecomputing.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
944 lines
25 KiB
944 lines
25 KiB