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-rw-r--r--drivers/thunderbolt/switch.c51
-rw-r--r--drivers/thunderbolt/tb.h22
-rw-r--r--drivers/thunderbolt/tb_regs.h1
-rw-r--r--drivers/thunderbolt/usb4.c155
4 files changed, 221 insertions, 8 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index d5420eefe25d..ac6cb304c49f 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -488,17 +488,21 @@ static const char *tb_port_type(const struct tb_regs_port_header *port)
}
}
-static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
+static void tb_dump_port(struct tb *tb, const struct tb_port *port)
{
+ const struct tb_regs_port_header *regs = &port->config;
+
tb_dbg(tb,
" Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
- port->port_number, port->vendor_id, port->device_id,
- port->revision, port->thunderbolt_version, tb_port_type(port),
- port->type);
+ regs->port_number, regs->vendor_id, regs->device_id,
+ regs->revision, regs->thunderbolt_version, tb_port_type(regs),
+ regs->type);
tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
- port->max_in_hop_id, port->max_out_hop_id);
- tb_dbg(tb, " Max counters: %d\n", port->max_counters);
- tb_dbg(tb, " NFC Credits: %#x\n", port->nfc_credits);
+ regs->max_in_hop_id, regs->max_out_hop_id);
+ tb_dbg(tb, " Max counters: %d\n", regs->max_counters);
+ tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits);
+ tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits,
+ port->ctl_credits);
}
/**
@@ -738,13 +742,32 @@ static int tb_init_port(struct tb_port *port)
cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
if (cap > 0)
port->cap_usb4 = cap;
+
+ /*
+ * USB4 ports the buffers allocated for the control path
+ * can be read from the path config space. Legacy
+ * devices we use hard-coded value.
+ */
+ if (tb_switch_is_usb4(port->sw)) {
+ struct tb_regs_hop hop;
+
+ if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
+ port->ctl_credits = hop.initial_credits;
+ }
+ if (!port->ctl_credits)
+ port->ctl_credits = 2;
+
} else if (port->port != 0) {
cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
if (cap > 0)
port->cap_adap = cap;
}
- tb_dump_port(port->sw->tb, &port->config);
+ port->total_credits =
+ (port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
+ ADP_CS_4_TOTAL_BUFFERS_SHIFT;
+
+ tb_dump_port(port->sw->tb, port);
INIT_LIST_HEAD(&port->list);
return 0;
@@ -2575,6 +2598,16 @@ void tb_switch_unconfigure_link(struct tb_switch *sw)
tb_lc_unconfigure_port(down);
}
+static void tb_switch_credits_init(struct tb_switch *sw)
+{
+ if (tb_switch_is_icm(sw))
+ return;
+ if (!tb_switch_is_usb4(sw))
+ return;
+ if (usb4_switch_credits_init(sw))
+ tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");
+}
+
/**
* tb_switch_add() - Add a switch to the domain
* @sw: Switch to add
@@ -2605,6 +2638,8 @@ int tb_switch_add(struct tb_switch *sw)
}
if (!sw->safe_mode) {
+ tb_switch_credits_init(sw);
+
/* read drom */
ret = tb_drom_read(sw);
if (ret) {
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index e6c5e8fc7de7..a8190009815c 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -136,6 +136,12 @@ struct tb_switch_tmu {
* @rpm_complete: Completion used to wait for runtime resume to
* complete (ICM only)
* @quirks: Quirks used for this Thunderbolt switch
+ * @credit_allocation: Are the below buffer allocation parameters valid
+ * @max_usb3_credits: Router preferred number of buffers for USB 3.x
+ * @min_dp_aux_credits: Router preferred minimum number of buffers for DP AUX
+ * @min_dp_main_credits: Router preferred minimum number of buffers for DP MAIN
+ * @max_pcie_credits: Router preferred number of buffers for PCIe
+ * @max_dma_credits: Router preferred number of buffers for DMA/P2P
*
* When the switch is being added or removed to the domain (other
* switches) you need to have domain lock held.
@@ -178,6 +184,12 @@ struct tb_switch {
u8 depth;
struct completion rpm_complete;
unsigned long quirks;
+ bool credit_allocation;
+ unsigned int max_usb3_credits;
+ unsigned int min_dp_aux_credits;
+ unsigned int min_dp_main_credits;
+ unsigned int max_pcie_credits;
+ unsigned int max_dma_credits;
};
/**
@@ -199,6 +211,8 @@ struct tb_switch {
* @in_hopids: Currently allocated input HopIDs
* @out_hopids: Currently allocated output HopIDs
* @list: Used to link ports to DP resources list
+ * @total_credits: Total number of buffers available for this port
+ * @ctl_credits: Buffers reserved for control path
*
* In USB4 terminology this structure represents an adapter (protocol or
* lane adapter).
@@ -220,6 +234,8 @@ struct tb_port {
struct ida in_hopids;
struct ida out_hopids;
struct list_head list;
+ unsigned int total_credits;
+ unsigned int ctl_credits;
};
/**
@@ -866,6 +882,11 @@ void tb_port_release_out_hopid(struct tb_port *port, int hopid);
struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
struct tb_port *prev);
+static inline bool tb_port_use_credit_allocation(const struct tb_port *port)
+{
+ return tb_port_is_null(port) && port->sw->credit_allocation;
+}
+
/**
* tb_for_each_port_on_path() - Iterate over each port on path
* @src: Source port
@@ -994,6 +1015,7 @@ int usb4_switch_nvm_write(struct tb_switch *sw, unsigned int address,
const void *buf, size_t size);
int usb4_switch_nvm_authenticate(struct tb_switch *sw);
int usb4_switch_nvm_authenticate_status(struct tb_switch *sw, u32 *status);
+int usb4_switch_credits_init(struct tb_switch *sw);
bool usb4_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in);
int usb4_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
int usb4_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
diff --git a/drivers/thunderbolt/tb_regs.h b/drivers/thunderbolt/tb_regs.h
index 113d7903b183..484f25be2849 100644
--- a/drivers/thunderbolt/tb_regs.h
+++ b/drivers/thunderbolt/tb_regs.h
@@ -229,6 +229,7 @@ enum usb4_switch_op {
USB4_SWITCH_OP_NVM_SET_OFFSET = 0x23,
USB4_SWITCH_OP_DROM_READ = 0x24,
USB4_SWITCH_OP_NVM_SECTOR_SIZE = 0x25,
+ USB4_SWITCH_OP_BUFFER_ALLOC = 0x33,
};
/* Router TMU configuration */
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c
index b56af7b0a093..edab8ea63c0b 100644
--- a/drivers/thunderbolt/usb4.c
+++ b/drivers/thunderbolt/usb4.c
@@ -36,6 +36,20 @@ enum usb4_sb_target {
#define USB4_NVM_SECTOR_SIZE_MASK GENMASK(23, 0)
+#define USB4_BA_LENGTH_MASK GENMASK(7, 0)
+#define USB4_BA_INDEX_MASK GENMASK(15, 0)
+
+enum usb4_ba_index {
+ USB4_BA_MAX_USB3 = 0x1,
+ USB4_BA_MIN_DP_AUX = 0x2,
+ USB4_BA_MIN_DP_MAIN = 0x3,
+ USB4_BA_MAX_PCIE = 0x4,
+ USB4_BA_MAX_HI = 0x5,
+};
+
+#define USB4_BA_VALUE_MASK GENMASK(31, 16)
+#define USB4_BA_VALUE_SHIFT 16
+
static int usb4_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
u32 value, int timeout_msec)
{
@@ -670,6 +684,147 @@ int usb4_switch_nvm_authenticate_status(struct tb_switch *sw, u32 *status)
}
/**
+ * usb4_switch_credits_init() - Read buffer allocation parameters
+ * @sw: USB4 router
+ *
+ * Reads @sw buffer allocation parameters and initializes @sw buffer
+ * allocation fields accordingly. Specifically @sw->credits_allocation
+ * is set to %true if these parameters can be used in tunneling.
+ *
+ * Returns %0 on success and negative errno otherwise.
+ */
+int usb4_switch_credits_init(struct tb_switch *sw)
+{
+ int max_usb3, min_dp_aux, min_dp_main, max_pcie, max_dma;
+ int ret, length, i, nports;
+ const struct tb_port *port;
+ u32 data[NVM_DATA_DWORDS];
+ u32 metadata = 0;
+ u8 status = 0;
+
+ memset(data, 0, sizeof(data));
+ ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_BUFFER_ALLOC, &metadata,
+ &status, NULL, 0, data, ARRAY_SIZE(data));
+ if (ret)
+ return ret;
+ if (status)
+ return -EIO;
+
+ length = metadata & USB4_BA_LENGTH_MASK;
+ if (WARN_ON(length > ARRAY_SIZE(data)))
+ return -EMSGSIZE;
+
+ max_usb3 = -1;
+ min_dp_aux = -1;
+ min_dp_main = -1;
+ max_pcie = -1;
+ max_dma = -1;
+
+ tb_sw_dbg(sw, "credit allocation parameters:\n");
+
+ for (i = 0; i < length; i++) {
+ u16 index, value;
+
+ index = data[i] & USB4_BA_INDEX_MASK;
+ value = (data[i] & USB4_BA_VALUE_MASK) >> USB4_BA_VALUE_SHIFT;
+
+ switch (index) {
+ case USB4_BA_MAX_USB3:
+ tb_sw_dbg(sw, " USB3: %u\n", value);
+ max_usb3 = value;
+ break;
+ case USB4_BA_MIN_DP_AUX:
+ tb_sw_dbg(sw, " DP AUX: %u\n", value);
+ min_dp_aux = value;
+ break;
+ case USB4_BA_MIN_DP_MAIN:
+ tb_sw_dbg(sw, " DP main: %u\n", value);
+ min_dp_main = value;
+ break;
+ case USB4_BA_MAX_PCIE:
+ tb_sw_dbg(sw, " PCIe: %u\n", value);
+ max_pcie = value;
+ break;
+ case USB4_BA_MAX_HI:
+ tb_sw_dbg(sw, " DMA: %u\n", value);
+ max_dma = value;
+ break;
+ default:
+ tb_sw_dbg(sw, " unknown credit allocation index %#x, skipping\n",
+ index);
+ break;
+ }
+ }
+
+ /*
+ * Validate the buffer allocation preferences. If we find
+ * issues, log a warning and fall back using the hard-coded
+ * values.
+ */
+
+ /* Host router must report baMaxHI */
+ if (!tb_route(sw) && max_dma < 0) {
+ tb_sw_warn(sw, "host router is missing baMaxHI\n");
+ goto err_invalid;
+ }
+
+ nports = 0;
+ tb_switch_for_each_port(sw, port) {
+ if (tb_port_is_null(port))
+ nports++;
+ }
+
+ /* Must have DP buffer allocation (multiple USB4 ports) */
+ if (nports > 2 && (min_dp_aux < 0 || min_dp_main < 0)) {
+ tb_sw_warn(sw, "multiple USB4 ports require baMinDPaux/baMinDPmain\n");
+ goto err_invalid;
+ }
+
+ tb_switch_for_each_port(sw, port) {
+ if (tb_port_is_dpout(port) && min_dp_main < 0) {
+ tb_sw_warn(sw, "missing baMinDPmain");
+ goto err_invalid;
+ }
+ if ((tb_port_is_dpin(port) || tb_port_is_dpout(port)) &&
+ min_dp_aux < 0) {
+ tb_sw_warn(sw, "missing baMinDPaux");
+ goto err_invalid;
+ }
+ if ((tb_port_is_usb3_down(port) || tb_port_is_usb3_up(port)) &&
+ max_usb3 < 0) {
+ tb_sw_warn(sw, "missing baMaxUSB3");
+ goto err_invalid;
+ }
+ if ((tb_port_is_pcie_down(port) || tb_port_is_pcie_up(port)) &&
+ max_pcie < 0) {
+ tb_sw_warn(sw, "missing baMaxPCIe");
+ goto err_invalid;
+ }
+ }
+
+ /*
+ * Buffer allocation passed the validation so we can use it in
+ * path creation.
+ */
+ sw->credit_allocation = true;
+ if (max_usb3 > 0)
+ sw->max_usb3_credits = max_usb3;
+ if (min_dp_aux > 0)
+ sw->min_dp_aux_credits = min_dp_aux;
+ if (min_dp_main > 0)
+ sw->min_dp_main_credits = min_dp_main;
+ if (max_pcie > 0)
+ sw->max_pcie_credits = max_pcie;
+ if (max_dma > 0)
+ sw->max_dma_credits = max_dma;
+
+ return 0;
+
+err_invalid:
+ return -EINVAL;
+}
+
+/**
* usb4_switch_query_dp_resource() - Query availability of DP IN resource
* @sw: USB4 router
* @in: DP IN adapter
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 03:44:57 +0000