diff options
| author | Maximilian Luz <luzmaximilian@gmail.com> | 2020-12-21 19:39:52 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2021-01-06 23:45:33 +0100 |
| commit | 44b84ee7b437dd7f869341b4b671963161a34a9f (patch) | |
| tree | 7faf78c2795d9c3e42590430a93b9fa345e9d407 /drivers/platform/surface/aggregator/ssh_packet_layer.h | |
| parent | c167b9c7e3d6131b4a4865c112a3dbc86d2e997d (diff) | |
platform/surface: aggregator: Add control packet allocation caching
Surface Serial Hub communication is, in its core, packet based. Each
sequenced packet requires to be acknowledged, via an ACK-type control
packet. In case invalid data has been received by the driver, a NAK-type
(not-acknowledge/negative acknowledge) control packet is sent,
triggering retransmission.
Control packets are therefore a core communication primitive and used
frequently enough (with every sequenced packet transmission sent by the
embedded controller, including events and request responses) that it may
warrant caching their allocations to reduce possible memory
fragmentation.
Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20201221183959.1186143-3-luzmaximilian@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers/platform/surface/aggregator/ssh_packet_layer.h')
| -rw-r--r-- | drivers/platform/surface/aggregator/ssh_packet_layer.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/platform/surface/aggregator/ssh_packet_layer.h b/drivers/platform/surface/aggregator/ssh_packet_layer.h index 058f111292ca..e8757d03f279 100644 --- a/drivers/platform/surface/aggregator/ssh_packet_layer.h +++ b/drivers/platform/surface/aggregator/ssh_packet_layer.h @@ -184,4 +184,7 @@ static inline void ssh_ptl_tx_wakeup_transfer(struct ssh_ptl *ptl) void ssh_packet_init(struct ssh_packet *packet, unsigned long type, u8 priority, const struct ssh_packet_ops *ops); +int ssh_ctrl_packet_cache_init(void); +void ssh_ctrl_packet_cache_destroy(void); + #endif /* _SURFACE_AGGREGATOR_SSH_PACKET_LAYER_H */ |