/* * Thunderbolt Cactus Ridge driver - PCIe tunnel * * Copyright (c) 2014 Andreas Noever */ #include #include #include "tunnel_pci.h" #include "tb.h" #define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...) \ do { \ struct tb_pci_tunnel *__tunnel = (tunnel); \ level(__tunnel->tb, "%llx:%x <-> %llx:%x (PCI): " fmt, \ tb_route(__tunnel->down_port->sw), \ __tunnel->down_port->port, \ tb_route(__tunnel->up_port->sw), \ __tunnel->up_port->port, \ ## arg); \ } while (0) #define tb_tunnel_WARN(tunnel, fmt, arg...) \ __TB_TUNNEL_PRINT(tb_WARN, tunnel, fmt, ##arg) #define tb_tunnel_warn(tunnel, fmt, arg...) \ __TB_TUNNEL_PRINT(tb_warn, tunnel, fmt, ##arg) #define tb_tunnel_info(tunnel, fmt, arg...) \ __TB_TUNNEL_PRINT(tb_info, tunnel, fmt, ##arg) static void tb_pci_init_path(struct tb_path *path) { path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; path->egress_shared_buffer = TB_PATH_NONE; path->ingress_fc_enable = TB_PATH_ALL; path->ingress_shared_buffer = TB_PATH_NONE; path->priority = 3; path->weight = 1; path->drop_packages = 0; path->nfc_credits = 0; } /** * tb_pci_alloc() - allocate a pci tunnel * * Allocate a PCI tunnel. The ports must be of type TB_TYPE_PCIE_UP and * TB_TYPE_PCIE_DOWN. * * Currently only paths consisting of two hops are supported (that is the * ports must be on "adjacent" switches). * * The paths are hard-coded to use hop 8 (the only working hop id available on * my thunderbolt devices). Therefore at most ONE path per device may be * activated. * * Return: Returns a tb_pci_tunnel on success or NULL on failure. */ struct tb_pci_tunnel *tb_pci_alloc(struct tb *tb, struct tb_port *up, struct tb_port *down) { struct tb_pci_tunnel *tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL); if (!tunnel) goto err; tunnel->tb = tb; tunnel->down_port = down; tunnel->up_port = up; INIT_LIST_HEAD(&tunnel->list); tunnel->path_to_up = tb_path_alloc(up->sw->tb, 2); if (!tunnel->path_to_up) goto err; tunnel->path_to_down = tb_path_alloc(up->sw->tb, 2); if (!tunnel->path_to_down) goto err; tb_pci_init_path(tunnel->path_to_up); tb_pci_init_path(tunnel->path_to_down); tunnel->path_to_up->hops[0].in_port = down; tunnel->path_to_up->hops[0].in_hop_index = 8; tunnel->path_to_up->hops[0].in_counter_index = -1; tunnel->path_to_up->hops[0].out_port = tb_upstream_port(up->sw)->remote; tunnel->path_to_up->hops[0].next_hop_index = 8; tunnel->path_to_up->hops[1].in_port = tb_upstream_port(up->sw); tunnel->path_to_up->hops[1].in_hop_index = 8; tunnel->path_to_up->hops[1].in_counter_index = -1; tunnel->path_to_up->hops[1].out_port = up; tunnel->path_to_up->hops[1].next_hop_index = 8; tunnel->path_to_down->hops[0].in_port = up; tunnel->path_to_down->hops[0].in_hop_index = 8; tunnel->path_to_down->hops[0].in_counter_index = -1; tunnel->path_to_down->hops[0].out_port = tb_upstream_port(up->sw); tunnel->path_to_down->hops[0].next_hop_index = 8; tunnel->path_to_down->hops[1].in_port = tb_upstream_port(up->sw)->remote; tunnel->path_to_down->hops[1].in_hop_index = 8; tunnel->path_to_down->hops[1].in_counter_index = -1; tunnel->path_to_down->hops[1].out_port = down; tunnel->path_to_down->hops[1].next_hop_index = 8; return tunnel; err: if (tunnel) { if (tunnel->path_to_down) tb_path_free(tunnel->path_to_down); if (tunnel->path_to_up) tb_path_free(tunnel->path_to_up); kfree(tunnel); } return NULL; } /** * tb_pci_free() - free a tunnel * * The tunnel must have been deactivated. */ void tb_pci_free(struct tb_pci_tunnel *tunnel) { if (tunnel->path_to_up->activated || tunnel->path_to_down->activated) { tb_tunnel_WARN(tunnel, "trying to free an activated tunnel\n"); return; } tb_path_free(tunnel->path_to_up); tb_path_free(tunnel->path_to_down); kfree(tunnel); } /** * tb_pci_is_invalid - check whether an activated path is still valid */ bool tb_pci_is_invalid(struct tb_pci_tunnel *tunnel) { WARN_ON(!tunnel->path_to_up->activated); WARN_ON(!tunnel->path_to_down->activated); return tb_path_is_invalid(tunnel->path_to_up) || tb_path_is_invalid(tunnel->path_to_down); } /** * tb_pci_port_active() - activate/deactivate PCI capability * * Return: Returns 0 on success or an error code on failure. */ static int tb_pci_port_active(struct tb_port *port, bool active) { u32 word = active ? 0x80000000 : 0x0; int cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PCIE); if (cap <= 0) { tb_port_warn(port, "TB_CAP_PCIE not found: %d\n", cap); return cap ? cap : -ENXIO; } return tb_port_write(port, &word, TB_CFG_PORT, cap, 1); } /** * tb_pci_restart() - activate a tunnel after a hardware reset */ int tb_pci_restart(struct tb_pci_tunnel *tunnel) { int res; tunnel->path_to_up->activated = false; tunnel->path_to_down->activated = false; tb_tunnel_info(tunnel, "activating\n"); res = tb_path_activate(tunnel->path_to_up); if (res) goto err; res = tb_path_activate(tunnel->path_to_down); if (res) goto err; res = tb_pci_port_active(tunnel->down_port, true); if (res) goto err; res = tb_pci_port_active(tunnel->up_port, true); if (res) goto err; return 0; err: tb_tunnel_warn(tunnel, "activation failed\n"); tb_pci_deactivate(tunnel); return res; } /** * tb_pci_activate() - activate a tunnel * * Return: Returns 0 on success or an error code on failure. */ int tb_pci_activate(struct tb_pci_tunnel *tunnel) { int res; if (tunnel->path_to_up->activated || tunnel->path_to_down->activated) { tb_tunnel_WARN(tunnel, "trying to activate an already activated tunnel\n"); return -EINVAL; } res = tb_pci_restart(tunnel); if (res) return res; list_add(&tunnel->list, &tunnel->tb->tunnel_list); return 0; } /** * tb_pci_deactivate() - deactivate a tunnel */ void tb_pci_deactivate(struct tb_pci_tunnel *tunnel) { tb_tunnel_info(tunnel, "deactivating\n"); /* * TODO: enable reset by writing 0x04000000 to TB_CAP_PCIE + 1 on up * port. Seems to have no effect? */ tb_pci_port_active(tunnel->up_port, false); tb_pci_port_active(tunnel->down_port, false); if (tunnel->path_to_down->activated) tb_path_deactivate(tunnel->path_to_down); if (tunnel->path_to_up->activated) tb_path_deactivate(tunnel->path_to_up); list_del_init(&tunnel->list); } ='diffstat' class='diffstat'>