diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2018-09-28 16:35:32 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2019-04-18 11:18:53 +0300 |
| commit | 44242d6c9703208e7e7abd6b4dbb258a930dd01a (patch) | |
| tree | e6705e5cbff04126399d3ebb8a8a4677b9aa8ce1 /drivers/thunderbolt/path.c | |
| parent | 3b4b3235ca5bf1b69ff15a269d9881b2604dd4fa (diff) | |
thunderbolt: Add support for DMA tunnels
In addition to PCIe and Display Port tunnels it is also possible to
create tunnels that forward DMA traffic from the host interface adapter
(NHI) to a NULL port that is connected to another domain through a
Thunderbolt cable. These tunnels can be used to carry software messages
such as networking packets.
To support this we introduce another tunnel type (TB_TUNNEL_DMA) that
supports paths from NHI to NULL port and back.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/path.c')
| -rw-r--r-- | drivers/thunderbolt/path.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/thunderbolt/path.c b/drivers/thunderbolt/path.c index 3fc92881a197..e4c22f53ef4d 100644 --- a/drivers/thunderbolt/path.c +++ b/drivers/thunderbolt/path.c @@ -341,7 +341,8 @@ static void __tb_path_deallocate_nfc(struct tb_path *path, int first_hop) } } -static int __tb_path_deactivate_hop(struct tb_port *port, int hop_index) +static int __tb_path_deactivate_hop(struct tb_port *port, int hop_index, + bool clear_fc) { struct tb_regs_hop hop; ktime_t timeout; @@ -369,8 +370,20 @@ static int __tb_path_deactivate_hop(struct tb_port *port, int hop_index) if (ret) return ret; - if (!hop.pending) + if (!hop.pending) { + if (clear_fc) { + /* Clear flow control */ + hop.ingress_fc = 0; + hop.egress_fc = 0; + hop.ingress_shared_buffer = 0; + hop.egress_shared_buffer = 0; + + return tb_port_write(port, &hop, TB_CFG_HOPS, + 2 * hop_index, 2); + } + return 0; + } usleep_range(10, 20); } while (ktime_before(ktime_get(), timeout)); @@ -384,7 +397,8 @@ static void __tb_path_deactivate_hops(struct tb_path *path, int first_hop) for (i = first_hop; i < path->path_length; i++) { res = __tb_path_deactivate_hop(path->hops[i].in_port, - path->hops[i].in_hop_index); + path->hops[i].in_hop_index, + path->clear_fc); if (res && res != -ENODEV) tb_port_warn(path->hops[i].in_port, "hop deactivation failed for hop %d, index %d\n", @@ -459,7 +473,7 @@ int tb_path_activate(struct tb_path *path) /* If it is left active deactivate it first */ __tb_path_deactivate_hop(path->hops[i].in_port, - path->hops[i].in_hop_index); + path->hops[i].in_hop_index, path->clear_fc); /* dword 0 */ hop.next_hop = path->hops[i].next_hop_index; |