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wireless/bluetooth: Add option to set the HCI TX thread affinity

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By enabling the config `CONFIG_BLUETOOTH_TXCMD_PINNED_TO_CORE` and
setting the value of `CONFIG_BLUETOOTH_TXCMD_CORE`, it's possible
to pin the HCI TX thread to a specific core on a SMP-enabled setup.
This is necessary for devices that require that the function that
sends data (`bt_send`) to be called from a specific core.
This commit is contained in:
Tiago Medicci Serrano 2023-10-09 17:15:18 -03:00 committed by Xiang Xiao
parent ef1ad691c3
commit fe156a40e3
2 changed files with 44 additions and 2 deletions
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19
wireless/bluetooth/Kconfig
View File

@ -193,6 +193,25 @@ config BLUETOOTH_TXCONN_NMSGS
int "Tx connection thread mqueue size"
default 16
config BLUETOOTH_TXCMD_PINNED_TO_CORE
bool "Pin Tx command thread to specific core"
depends on SMP
default n
---help---
This option enables us to set the affinity of the Tx command thread
to make it run on a specific core.
if BLUETOOTH_TXCMD_PINNED_TO_CORE
config BLUETOOTH_TXCMD_CORE
int "Tx command thread CPU core"
default 1
range 1 SMP_NCPUS
---help---
Select the core to pin the Tx command thread.
endif # BLUETOOTH_TXCMD_PINNED_TO_CORE
endmenu # Kernel Thread Configuration
config BLUETOOTH_SMP_SELFTEST

27
wireless/bluetooth/bt_hcicore.c
View File

@ -1499,6 +1499,10 @@ static void cmd_queue_deinit(void)
static void cmd_queue_init(void)
{
int ret;
#ifdef CONFIG_BLUETOOTH_TXCMD_PINNED_TO_CORE
cpu_set_t cpuset;
#endif
int pid;
/* When there is a command to be sent to the Bluetooth driver, it queued on
* the Tx queue and received by logic on the Tx kernel thread.
@ -1512,10 +1516,29 @@ static void cmd_queue_init(void)
g_btdev.ncmd = 1;
g_btdev.tx_status = OK;
ret = kthread_create("BT HCI Tx", CONFIG_BLUETOOTH_TXCMD_PRIORITY,
#ifdef CONFIG_BLUETOOTH_TXCMD_PINNED_TO_CORE
sched_lock();
#endif
pid = kthread_create("BT HCI Tx", CONFIG_BLUETOOTH_TXCMD_PRIORITY,
CONFIG_BLUETOOTH_TXCMD_STACKSIZE,
hci_tx_kthread, NULL);
DEBUGASSERT(ret > 0);
DEBUGASSERT(pid > 0);
#ifdef CONFIG_BLUETOOTH_TXCMD_PINNED_TO_CORE
CPU_ZERO(&cpuset);
CPU_SET((CONFIG_BLUETOOTH_TXCMD_CORE - 1), &cpuset);
ret = nxsched_set_affinity(pid, sizeof(cpuset), &cpuset);
if (ret)
{
wlerr("Failed to set affinity error=%d\n", ret);
DEBUGPANIC();
}
sched_unlock();
#endif
UNUSED(ret);
}