123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234 |
- /*
- * Thunderbolt Cactus Ridge driver - path/tunnel functionality
- *
- * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
- */
- #include <linux/slab.h>
- #include <linux/errno.h>
- #include "tb.h"
- static void tb_dump_hop(struct tb_port *port, struct tb_regs_hop *hop)
- {
- tb_port_info(port, " Hop through port %d to hop %d (%s)\n",
- hop->out_port, hop->next_hop,
- hop->enable ? "enabled" : "disabled");
- tb_port_info(port, " Weight: %d Priority: %d Credits: %d Drop: %d\n",
- hop->weight, hop->priority,
- hop->initial_credits, hop->drop_packages);
- tb_port_info(port, " Counter enabled: %d Counter index: %d\n",
- hop->counter_enable, hop->counter);
- tb_port_info(port, " Flow Control (In/Eg): %d/%d Shared Buffer (In/Eg): %d/%d\n",
- hop->ingress_fc, hop->egress_fc,
- hop->ingress_shared_buffer, hop->egress_shared_buffer);
- tb_port_info(port, " Unknown1: %#x Unknown2: %#x Unknown3: %#x\n",
- hop->unknown1, hop->unknown2, hop->unknown3);
- }
- /**
- * tb_path_alloc() - allocate a thunderbolt path
- *
- * Return: Returns a tb_path on success or NULL on failure.
- */
- struct tb_path *tb_path_alloc(struct tb *tb, int num_hops)
- {
- struct tb_path *path = kzalloc(sizeof(*path), GFP_KERNEL);
- if (!path)
- return NULL;
- path->hops = kcalloc(num_hops, sizeof(*path->hops), GFP_KERNEL);
- if (!path->hops) {
- kfree(path);
- return NULL;
- }
- path->tb = tb;
- path->path_length = num_hops;
- return path;
- }
- /**
- * tb_path_free() - free a deactivated path
- */
- void tb_path_free(struct tb_path *path)
- {
- if (path->activated) {
- tb_WARN(path->tb, "trying to free an activated path\n")
- return;
- }
- kfree(path->hops);
- kfree(path);
- }
- static void __tb_path_deallocate_nfc(struct tb_path *path, int first_hop)
- {
- int i, res;
- for (i = first_hop; i < path->path_length; i++) {
- res = tb_port_add_nfc_credits(path->hops[i].in_port,
- -path->nfc_credits);
- if (res)
- tb_port_warn(path->hops[i].in_port,
- "nfc credits deallocation failed for hop %d\n",
- i);
- }
- }
- static void __tb_path_deactivate_hops(struct tb_path *path, int first_hop)
- {
- int i, res;
- struct tb_regs_hop hop = { };
- for (i = first_hop; i < path->path_length; i++) {
- res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS,
- 2 * path->hops[i].in_hop_index, 2);
- if (res)
- tb_port_warn(path->hops[i].in_port,
- "hop deactivation failed for hop %d, index %d\n",
- i, path->hops[i].in_hop_index);
- }
- }
- void tb_path_deactivate(struct tb_path *path)
- {
- if (!path->activated) {
- tb_WARN(path->tb, "trying to deactivate an inactive path\n");
- return;
- }
- tb_info(path->tb,
- "deactivating path from %llx:%x to %llx:%x\n",
- tb_route(path->hops[0].in_port->sw),
- path->hops[0].in_port->port,
- tb_route(path->hops[path->path_length - 1].out_port->sw),
- path->hops[path->path_length - 1].out_port->port);
- __tb_path_deactivate_hops(path, 0);
- __tb_path_deallocate_nfc(path, 0);
- path->activated = false;
- }
- /**
- * tb_path_activate() - activate a path
- *
- * Activate a path starting with the last hop and iterating backwards. The
- * caller must fill path->hops before calling tb_path_activate().
- *
- * Return: Returns 0 on success or an error code on failure.
- */
- int tb_path_activate(struct tb_path *path)
- {
- int i, res;
- enum tb_path_port out_mask, in_mask;
- if (path->activated) {
- tb_WARN(path->tb, "trying to activate already activated path\n");
- return -EINVAL;
- }
- tb_info(path->tb,
- "activating path from %llx:%x to %llx:%x\n",
- tb_route(path->hops[0].in_port->sw),
- path->hops[0].in_port->port,
- tb_route(path->hops[path->path_length - 1].out_port->sw),
- path->hops[path->path_length - 1].out_port->port);
- /* Clear counters. */
- for (i = path->path_length - 1; i >= 0; i--) {
- if (path->hops[i].in_counter_index == -1)
- continue;
- res = tb_port_clear_counter(path->hops[i].in_port,
- path->hops[i].in_counter_index);
- if (res)
- goto err;
- }
- /* Add non flow controlled credits. */
- for (i = path->path_length - 1; i >= 0; i--) {
- res = tb_port_add_nfc_credits(path->hops[i].in_port,
- path->nfc_credits);
- if (res) {
- __tb_path_deallocate_nfc(path, i);
- goto err;
- }
- }
- /* Activate hops. */
- for (i = path->path_length - 1; i >= 0; i--) {
- struct tb_regs_hop hop = { 0 };
- /*
- * We do (currently) not tear down paths setup by the firmeware.
- * If a firmware device is unplugged and plugged in again then
- * it can happen that we reuse some of the hops from the (now
- * defunct) firmeware path. This causes the hotplug operation to
- * fail (the pci device does not show up). Clearing the hop
- * before overwriting it fixes the problem.
- *
- * Should be removed once we discover and tear down firmeware
- * paths.
- */
- res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS,
- 2 * path->hops[i].in_hop_index, 2);
- if (res) {
- __tb_path_deactivate_hops(path, i);
- __tb_path_deallocate_nfc(path, 0);
- goto err;
- }
- /* dword 0 */
- hop.next_hop = path->hops[i].next_hop_index;
- hop.out_port = path->hops[i].out_port->port;
- /* TODO: figure out why these are good values */
- hop.initial_credits = (i == path->path_length - 1) ? 16 : 7;
- hop.unknown1 = 0;
- hop.enable = 1;
- /* dword 1 */
- out_mask = (i == path->path_length - 1) ?
- TB_PATH_DESTINATION : TB_PATH_INTERNAL;
- in_mask = (i == 0) ? TB_PATH_SOURCE : TB_PATH_INTERNAL;
- hop.weight = path->weight;
- hop.unknown2 = 0;
- hop.priority = path->priority;
- hop.drop_packages = path->drop_packages;
- hop.counter = path->hops[i].in_counter_index;
- hop.counter_enable = path->hops[i].in_counter_index != -1;
- hop.ingress_fc = path->ingress_fc_enable & in_mask;
- hop.egress_fc = path->egress_fc_enable & out_mask;
- hop.ingress_shared_buffer = path->ingress_shared_buffer
- & in_mask;
- hop.egress_shared_buffer = path->egress_shared_buffer
- & out_mask;
- hop.unknown3 = 0;
- tb_port_info(path->hops[i].in_port, "Writing hop %d, index %d",
- i, path->hops[i].in_hop_index);
- tb_dump_hop(path->hops[i].in_port, &hop);
- res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS,
- 2 * path->hops[i].in_hop_index, 2);
- if (res) {
- __tb_path_deactivate_hops(path, i);
- __tb_path_deallocate_nfc(path, 0);
- goto err;
- }
- }
- path->activated = true;
- tb_info(path->tb, "path activation complete\n");
- return 0;
- err:
- tb_WARN(path->tb, "path activation failed\n");
- return res;
- }
- /**
- * tb_path_is_invalid() - check whether any ports on the path are invalid
- *
- * Return: Returns true if the path is invalid, false otherwise.
- */
- bool tb_path_is_invalid(struct tb_path *path)
- {
- int i = 0;
- for (i = 0; i < path->path_length; i++) {
- if (path->hops[i].in_port->sw->is_unplugged)
- return true;
- if (path->hops[i].out_port->sw->is_unplugged)
- return true;
- }
- return false;
- }
|