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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2022-03-23 15:45:39 +0100 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2023-01-17 10:37:16 +0100 |
| commit | 6ce3563520be90a155706bafc186fc264a13850e (patch) | |
| tree | 8c3c4adba67ab76fdb10a9e3e98498f573a853d4 /drivers/thunderbolt/tunnel.h | |
| parent | thunderbolt: Include the additional DP IN double word in debugfs dump (diff) | |
| download | linux-6ce3563520be90a155706bafc186fc264a13850e.tar.xz linux-6ce3563520be90a155706bafc186fc264a13850e.zip | |
thunderbolt: Add support for DisplayPort bandwidth allocation mode
The USB4 spec defines an optional feature that allows the connection
manager to negotiate with the graphics through DPCD registers changes in
the bandwidth allocation dynamically. This is referred as "bandwidth
allocation mode" in the spec. The connection manager uses DP IN adapters
registers to communicate with the graphics, and also gets notifications
from these adapters when the graphics wants to change the bandwidth
allocation. Both the connection manager and the graphics driver needs to
support this.
We check if the DP IN adapter supports this and if it does enable it
before establishing a DP tunnel. Then we react on DP_BW notifications
coming from the DP IN adapter and update the bandwidth allocation
accordingly (within the maximum common capabilities the DP IN/OUT
support).
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/tunnel.h')
| -rw-r--r-- | drivers/thunderbolt/tunnel.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/thunderbolt/tunnel.h b/drivers/thunderbolt/tunnel.h index bb4d1f1d6d0b..d7bbdf8c8186 100644 --- a/drivers/thunderbolt/tunnel.h +++ b/drivers/thunderbolt/tunnel.h @@ -29,6 +29,9 @@ enum tb_tunnel_type { * @init: Optional tunnel specific initialization * @deinit: Optional tunnel specific de-initialization * @activate: Optional tunnel specific activation/deactivation + * @maximum_bandwidth: + * @allocated_bandwidth: Return how much bandwidth is allocated for the tunnel + * @alloc_bandwidth: Change tunnel bandwidth allocation * @consumed_bandwidth: Return how much bandwidth the tunnel consumes * @release_unused_bandwidth: Release all unused bandwidth * @reclaim_available_bandwidth: Reclaim back available bandwidth @@ -40,6 +43,8 @@ enum tb_tunnel_type { * Only set if the bandwidth needs to be limited. * @allocated_up: Allocated upstream bandwidth (only for USB3) * @allocated_down: Allocated downstream bandwidth (only for USB3) + * @bw_mode: DP bandwidth allocation mode registers can be used to + * determine consumed and allocated bandwidth */ struct tb_tunnel { struct tb *tb; @@ -50,6 +55,12 @@ struct tb_tunnel { int (*init)(struct tb_tunnel *tunnel); void (*deinit)(struct tb_tunnel *tunnel); int (*activate)(struct tb_tunnel *tunnel, bool activate); + int (*maximum_bandwidth)(struct tb_tunnel *tunnel, int *max_up, + int *max_down); + int (*allocated_bandwidth)(struct tb_tunnel *tunnel, int *allocated_up, + int *allocated_down); + int (*alloc_bandwidth)(struct tb_tunnel *tunnel, int *alloc_up, + int *alloc_down); int (*consumed_bandwidth)(struct tb_tunnel *tunnel, int *consumed_up, int *consumed_down); int (*release_unused_bandwidth)(struct tb_tunnel *tunnel); @@ -62,6 +73,7 @@ struct tb_tunnel { int max_down; int allocated_up; int allocated_down; + bool bw_mode; }; struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down, @@ -92,6 +104,12 @@ void tb_tunnel_deactivate(struct tb_tunnel *tunnel); bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel); bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel, const struct tb_port *port); +int tb_tunnel_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up, + int *max_down); +int tb_tunnel_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up, + int *allocated_down); +int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up, + int *alloc_down); int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up, int *consumed_down); int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel); |