diff options
Diffstat (limited to 'drivers/thunderbolt')
| -rw-r--r-- | drivers/thunderbolt/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/thunderbolt/debugfs.c | 92 | ||||
| -rw-r--r-- | drivers/thunderbolt/retimer.c | 43 | ||||
| -rw-r--r-- | drivers/thunderbolt/sb_regs.h | 1 | ||||
| -rw-r--r-- | drivers/thunderbolt/tb.h | 5 | ||||
| -rw-r--r-- | drivers/thunderbolt/usb4.c | 24 |
6 files changed, 128 insertions, 48 deletions
diff --git a/drivers/thunderbolt/Kconfig b/drivers/thunderbolt/Kconfig index 3e01f41e9d66..0abdb69ee9f4 100644 --- a/drivers/thunderbolt/Kconfig +++ b/drivers/thunderbolt/Kconfig @@ -32,14 +32,15 @@ config USB4_DEBUGFS_WRITE this for production systems or distro kernels. config USB4_DEBUGFS_MARGINING - bool "Expose receiver lane margining operations under USB4 ports (DANGEROUS)" + bool "Expose receiver lane margining operations under USB4 ports and retimers (DANGEROUS)" depends on DEBUG_FS depends on USB4_DEBUGFS_WRITE help - Enables hardware and software based receiver lane margining support - under each USB4 port. Used for electrical quality and robustness - validation during manufacturing. Should not be enabled by distro - kernels. + Enables hardware and software based receiver lane margining + support under each USB4 port and retimer, including retimers + on the other side of the cable. Used for electrical quality + and robustness validation during manufacturing. Should not be + enabled by distro kernels. config USB4_KUNIT_TEST bool "KUnit tests" if !KUNIT_ALL_TESTS diff --git a/drivers/thunderbolt/debugfs.c b/drivers/thunderbolt/debugfs.c index 87b2c91a4656..c2a735421609 100644 --- a/drivers/thunderbolt/debugfs.c +++ b/drivers/thunderbolt/debugfs.c @@ -380,6 +380,9 @@ out_rpm_put: /** * struct tb_margining - Lane margining support * @port: USB4 port through which the margining operations are run + * @target: Sideband target + * @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER + * @dev: Pointer to the device that is the target (USB4 port or retimer) * @caps: Port lane margining capabilities * @results: Last lane margining results * @lanes: %0, %1 or %7 (all) @@ -397,6 +400,9 @@ out_rpm_put: */ struct tb_margining { struct tb_port *port; + enum usb4_sb_target target; + u8 index; + struct device *dev; u32 caps[2]; u32 results[2]; unsigned int lanes; @@ -736,6 +742,7 @@ static int margining_run_write(void *data, u64 val) { struct tb_margining *margining = data; struct tb_port *port = margining->port; + struct device *dev = margining->dev; struct tb_switch *sw = port->sw; struct tb_switch *down_sw; struct tb *tb = sw->tb; @@ -744,7 +751,7 @@ static int margining_run_write(void *data, u64 val) if (val != 1) return -EINVAL; - pm_runtime_get_sync(&sw->dev); + pm_runtime_get_sync(dev); if (mutex_lock_interruptible(&tb->lock)) { ret = -ERESTARTSYS; @@ -772,24 +779,29 @@ static int margining_run_write(void *data, u64 val) } if (margining->software) { - tb_port_dbg(port, "running software %s lane margining for lanes %u\n", - margining->time ? "time" : "voltage", margining->lanes); - ret = usb4_port_sw_margin(port, USB4_SB_TARGET_ROUTER, 0, + tb_port_dbg(port, + "running software %s lane margining for %s lanes %u\n", + margining->time ? "time" : "voltage", dev_name(dev), + margining->lanes); + ret = usb4_port_sw_margin(port, margining->target, margining->index, margining->lanes, margining->time, margining->right_high, USB4_MARGIN_SW_COUNTER_CLEAR); if (ret) goto out_clx; - ret = usb4_port_sw_margin_errors(port, USB4_SB_TARGET_ROUTER, 0, + ret = usb4_port_sw_margin_errors(port, margining->target, + margining->index, &margining->results[0]); } else { - tb_port_dbg(port, "running hardware %s lane margining for lanes %u\n", - margining->time ? "time" : "voltage", margining->lanes); + tb_port_dbg(port, + "running hardware %s lane margining for %s lanes %u\n", + margining->time ? "time" : "voltage", dev_name(dev), + margining->lanes); /* Clear the results */ margining->results[0] = 0; margining->results[1] = 0; - ret = usb4_port_hw_margin(port, USB4_SB_TARGET_ROUTER, 0, + ret = usb4_port_hw_margin(port, margining->target, margining->index, margining->lanes, margining->ber_level, margining->time, margining->right_high, margining->results); @@ -801,8 +813,8 @@ out_clx: out_unlock: mutex_unlock(&tb->lock); out_rpm_put: - pm_runtime_mark_last_busy(&sw->dev); - pm_runtime_put_autosuspend(&sw->dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); return ret; } @@ -1044,33 +1056,29 @@ static int margining_margin_show(struct seq_file *s, void *not_used) } DEBUGFS_ATTR_RW(margining_margin); -static void margining_port_init(struct tb_port *port) +static struct tb_margining *margining_alloc(struct tb_port *port, + struct device *dev, + enum usb4_sb_target target, + u8 index, struct dentry *parent) { struct tb_margining *margining; - struct dentry *dir, *parent; - struct usb4_port *usb4; - char dir_name[10]; + struct dentry *dir; unsigned int val; int ret; - usb4 = port->usb4; - if (!usb4) - return; - - snprintf(dir_name, sizeof(dir_name), "port%d", port->port); - parent = debugfs_lookup(dir_name, port->sw->debugfs_dir); - margining = kzalloc(sizeof(*margining), GFP_KERNEL); if (!margining) - return; + return NULL; margining->port = port; + margining->target = target; + margining->index = index; + margining->dev = dev; - ret = usb4_port_margining_caps(port, USB4_SB_TARGET_ROUTER, 0, - margining->caps); + ret = usb4_port_margining_caps(port, target, index, margining->caps); if (ret) { kfree(margining); - return; + return NULL; } /* Set the initial mode */ @@ -1124,8 +1132,22 @@ static void margining_port_init(struct tb_port *port) independent_time_margins(margining) == USB4_MARGIN_CAP_1_TIME_LR)) debugfs_create_file("margin", 0600, dir, margining, &margining_margin_fops); + return margining; +} - usb4->margining = margining; +static void margining_port_init(struct tb_port *port) +{ + struct dentry *parent; + char dir_name[10]; + + if (!port->usb4) + return; + + snprintf(dir_name, sizeof(dir_name), "port%d", port->port); + parent = debugfs_lookup(dir_name, port->sw->debugfs_dir); + port->usb4->margining = margining_alloc(port, &port->usb4->dev, + USB4_SB_TARGET_ROUTER, 0, + parent); } static void margining_port_remove(struct tb_port *port) @@ -1199,11 +1221,27 @@ static void margining_xdomain_remove(struct tb_xdomain *xd) downstream = tb_port_at(xd->route, parent_sw); margining_port_remove(downstream); } + +static void margining_retimer_init(struct tb_retimer *rt, struct dentry *debugfs_dir) +{ + rt->margining = margining_alloc(rt->port, &rt->dev, + USB4_SB_TARGET_RETIMER, rt->index, + debugfs_dir); +} + +static void margining_retimer_remove(struct tb_retimer *rt) +{ + kfree(rt->margining); + rt->margining = NULL; +} #else static inline void margining_switch_init(struct tb_switch *sw) { } static inline void margining_switch_remove(struct tb_switch *sw) { } static inline void margining_xdomain_init(struct tb_xdomain *xd) { } static inline void margining_xdomain_remove(struct tb_xdomain *xd) { } +static inline void margining_retimer_init(struct tb_retimer *rt, + struct dentry *debugfs_dir) { } +static inline void margining_retimer_remove(struct tb_retimer *rt) { } #endif static int port_clear_all_counters(struct tb_port *port) @@ -1864,6 +1902,7 @@ void tb_retimer_debugfs_init(struct tb_retimer *rt) debugfs_dir = debugfs_create_dir(dev_name(&rt->dev), tb_debugfs_root); debugfs_create_file("sb_regs", DEBUGFS_MODE, debugfs_dir, rt, &retimer_sb_regs_fops); + margining_retimer_init(rt, debugfs_dir); } /** @@ -1875,6 +1914,7 @@ void tb_retimer_debugfs_init(struct tb_retimer *rt) void tb_retimer_debugfs_remove(struct tb_retimer *rt) { debugfs_lookup_and_remove(dev_name(&rt->dev), tb_debugfs_root); + margining_retimer_remove(rt); } void tb_debugfs_init(void) diff --git a/drivers/thunderbolt/retimer.c b/drivers/thunderbolt/retimer.c index 8ce1dc7bbfad..721319329afa 100644 --- a/drivers/thunderbolt/retimer.c +++ b/drivers/thunderbolt/retimer.c @@ -14,7 +14,11 @@ #include "sb_regs.h" #include "tb.h" +#if IS_ENABLED(CONFIG_USB4_DEBUGFS_MARGINING) #define TB_MAX_RETIMER_INDEX 6 +#else +#define TB_MAX_RETIMER_INDEX 2 +#endif /** * tb_retimer_nvm_read() - Read contents of retimer NVM @@ -319,6 +323,8 @@ static ssize_t nvm_version_show(struct device *dev, if (!rt->nvm) ret = -EAGAIN; + else if (rt->no_nvm_upgrade) + ret = -EOPNOTSUPP; else ret = sysfs_emit(buf, "%x.%x\n", rt->nvm->major, rt->nvm->minor); @@ -366,7 +372,8 @@ const struct device_type tb_retimer_type = { .release = tb_retimer_release, }; -static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status) +static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status, + bool on_board) { struct tb_retimer *rt; u32 vendor, device; @@ -388,13 +395,6 @@ static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status) return ret; } - /* - * Check that it supports NVM operations. If not then don't add - * the device at all. - */ - ret = usb4_port_retimer_nvm_sector_size(port, index); - if (ret < 0) - return ret; rt = kzalloc(sizeof(*rt), GFP_KERNEL); if (!rt) @@ -407,6 +407,13 @@ static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status) rt->port = port; rt->tb = port->sw->tb; + /* + * Only support NVM upgrade for on-board retimers. The retimers + * on the other side of the connection. + */ + if (!on_board || usb4_port_retimer_nvm_sector_size(port, index) <= 0) + rt->no_nvm_upgrade = true; + rt->dev.parent = &port->usb4->dev; rt->dev.bus = &tb_bus_type; rt->dev.type = &tb_retimer_type; @@ -487,7 +494,7 @@ static struct tb_retimer *tb_port_find_retimer(struct tb_port *port, u8 index) int tb_retimer_scan(struct tb_port *port, bool add) { u32 status[TB_MAX_RETIMER_INDEX + 1] = {}; - int ret, i, last_idx = 0; + int ret, i, max, last_idx = 0; /* * Send broadcast RT to make sure retimer indices facing this @@ -522,26 +529,28 @@ int tb_retimer_scan(struct tb_port *port, bool add) break; } - tb_retimer_unset_inbound_sbtx(port); - - if (!last_idx) - return 0; - - /* Add on-board retimers if they do not exist already */ + max = i; ret = 0; - for (i = 1; i <= last_idx; i++) { + + /* Add retimers if they do not exist already */ + for (i = 1; i <= max; i++) { struct tb_retimer *rt; + /* Skip cable retimers */ + if (usb4_port_retimer_is_cable(port, i)) + continue; + rt = tb_port_find_retimer(port, i); if (rt) { put_device(&rt->dev); } else if (add) { - ret = tb_retimer_add(port, i, status[i]); + ret = tb_retimer_add(port, i, status[i], i <= last_idx); if (ret && ret != -EOPNOTSUPP) break; } } + tb_retimer_unset_inbound_sbtx(port); return ret; } diff --git a/drivers/thunderbolt/sb_regs.h b/drivers/thunderbolt/sb_regs.h index b2a6add82161..a29ef3c19422 100644 --- a/drivers/thunderbolt/sb_regs.h +++ b/drivers/thunderbolt/sb_regs.h @@ -26,6 +26,7 @@ enum usb4_sb_opcode { USB4_SB_OPCODE_SET_INBOUND_SBTX = 0x5055534c, /* "LSUP" */ USB4_SB_OPCODE_UNSET_INBOUND_SBTX = 0x50555355, /* "USUP" */ USB4_SB_OPCODE_QUERY_LAST_RETIMER = 0x5453414c, /* "LAST" */ + USB4_SB_OPCODE_QUERY_CABLE_RETIMER = 0x524c4243, /* "CBLR" */ USB4_SB_OPCODE_GET_NVM_SECTOR_SIZE = 0x53534e47, /* "GNSS" */ USB4_SB_OPCODE_NVM_SET_OFFSET = 0x53504f42, /* "BOPS" */ USB4_SB_OPCODE_NVM_BLOCK_WRITE = 0x574b4c42, /* "BLKW" */ diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 2f3de3d3c2e0..b47f7873c847 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -329,6 +329,7 @@ struct usb4_port { * @nvm: Pointer to the NVM if the retimer has one (%NULL otherwise) * @no_nvm_upgrade: Prevent NVM upgrade of this retimer * @auth_status: Status of last NVM authentication + * @margining: Pointer to margining structure if enabled */ struct tb_retimer { struct device dev; @@ -340,6 +341,9 @@ struct tb_retimer { struct tb_nvm *nvm; bool no_nvm_upgrade; u32 auth_status; +#ifdef CONFIG_USB4_DEBUGFS_MARGINING + struct tb_margining *margining; +#endif }; /** @@ -1363,6 +1367,7 @@ int usb4_port_sw_margin_errors(struct tb_port *port, enum usb4_sb_target target, int usb4_port_retimer_set_inbound_sbtx(struct tb_port *port, u8 index); int usb4_port_retimer_unset_inbound_sbtx(struct tb_port *port, u8 index); int usb4_port_retimer_is_last(struct tb_port *port, u8 index); +int usb4_port_retimer_is_cable(struct tb_port *port, u8 index); int usb4_port_retimer_nvm_sector_size(struct tb_port *port, u8 index); int usb4_port_retimer_nvm_set_offset(struct tb_port *port, u8 index, unsigned int address); diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index d952de07493f..4d83b65afb5b 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -1831,6 +1831,30 @@ int usb4_port_retimer_is_last(struct tb_port *port, u8 index) } /** + * usb4_port_retimer_is_cable() - Is the retimer cable retimer + * @port: USB4 port + * @index: Retimer index + * + * If the retimer at @index is last cable retimer this function returns + * %1 and %0 if it is on-board retimer. In case a retimer is not present + * at @index returns %-ENODEV. Otherwise returns negative errno. + */ +int usb4_port_retimer_is_cable(struct tb_port *port, u8 index) +{ + u32 metadata; + int ret; + + ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_QUERY_CABLE_RETIMER, + 500); + if (ret) + return ret; + + ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index, + USB4_SB_METADATA, &metadata, sizeof(metadata)); + return ret ? ret : metadata & 1; +} + +/** * usb4_port_retimer_nvm_sector_size() - Read retimer NVM sector size * @port: USB4 port * @index: Retimer index |