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| author | Gil Fine <gil.fine@linux.intel.com> | 2023-07-31 04:25:40 +0200 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2023-10-20 17:18:01 +0200 |
| commit | 582e70b0d3a412d15389a3c9c07a44791b311715 (patch) | |
| tree | 95c598c22eea375379f978ea493c1dc3beb6db64 /drivers/thunderbolt/tb.c | |
| parent | thunderbolt: Make is_gen4_link() available to the rest of the driver (diff) | |
| download | linux-582e70b0d3a412d15389a3c9c07a44791b311715.tar.xz linux-582e70b0d3a412d15389a3c9c07a44791b311715.zip | |
thunderbolt: Change bandwidth reservations to comply USB4 v2
USB4 v2 Connection Manager guide (section 6.1.2.3) suggests to reserve
bandwidth in a sligthly different manner. It suggests to keep minimum of
1500 Mb/s for each path that carry a bulk traffic. Here we change the
bandwidth reservations to comply to the above for USB 3.x and PCIe
protocols over Gen 4 link, taking weights into account (that's 1500 Mb/s
for PCIe and 3000 Mb/s for USB 3.x).
For Gen 3 and below we use the existing reservation.
Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/tb.c')
| -rw-r--r-- | drivers/thunderbolt/tb.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 983b58d66096..1b379e9487b9 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -602,6 +602,7 @@ static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, /* Find the minimum available bandwidth over all links */ tb_for_each_port_on_path(src_port, dst_port, port) { int link_speed, link_width, up_bw, down_bw; + int pci_reserved_up, pci_reserved_down; if (!tb_port_is_null(port)) continue; @@ -695,6 +696,16 @@ static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, up_bw -= usb3_consumed_up; down_bw -= usb3_consumed_down; + /* + * If there is anything reserved for PCIe bulk traffic + * take it into account here too. + */ + if (tb_tunnel_reserved_pci(port, &pci_reserved_up, + &pci_reserved_down)) { + up_bw -= pci_reserved_up; + down_bw -= pci_reserved_down; + } + if (up_bw < *available_up) *available_up = up_bw; if (down_bw < *available_down) |