Merge tag 'thunderbolt-for-v5.4' of...

Merge tag 'thunderbolt-for-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into char-misc-next

Mika writes:

thunderbolt: Changes for v5.4 merge window

The biggest change is the addition of Intel Ice Lake integrated
Thunderbolt support. There are also a couple of smaller changes like
converting the driver to use better device property interface and use
correct format string in service key attribute.

* tag 'thunderbolt-for-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt:
  ACPI / property: Add two new Thunderbolt property GUIDs to the list
  thunderbolt: Add support for Intel Ice Lake
  thunderbolt: Expose active parts of NVM even if upgrade is not supported
  thunderbolt: Hide switch attributes that are not set
  thunderbolt: Do not fail adding switch if some port is not implemented
  thunderbolt: Use 32-bit writes when writing ring producer/consumer
  thunderbolt: Move NVM upgrade support flag to struct icm
  thunderbolt: Correct path indices for PCIe tunnel
  thunderbolt: Show key using %*pE not %*pEp
  thunderbolt: Switch to use device_property_count_uXX()

drivers/acpi/property.c

@@ -39,6 +39,12 @@ static const guid_t prp_guids[] = {
 	/* External facing port GUID: efcc06cc-73ac-4bc3-bff0-76143807c389 */
 	GUID_INIT(0xefcc06cc, 0x73ac, 0x4bc3,
 		  0xbf, 0xf0, 0x76, 0x14, 0x38, 0x07, 0xc3, 0x89),
+	/* Thunderbolt GUID for IMR_VALID: c44d002f-69f9-4e7d-a904-a7baabdf43f7 */
+	GUID_INIT(0xc44d002f, 0x69f9, 0x4e7d,
+		  0xa9, 0x04, 0xa7, 0xba, 0xab, 0xdf, 0x43, 0xf7),
+	/* Thunderbolt GUID for WAKE_SUPPORTED: 6c501103-c189-4296-ba72-9bf5a26ebe5d */
+	GUID_INIT(0x6c501103, 0xc189, 0x4296,
+		  0xba, 0x72, 0x9b, 0xf5, 0xa2, 0x6e, 0xbe, 0x5d),
 };
 
 /* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */

drivers/thunderbolt/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
 obj-${CONFIG_THUNDERBOLT} := thunderbolt.o
-thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o path.o tunnel.o eeprom.o
+thunderbolt-objs := nhi.o nhi_ops.o ctl.o tb.o switch.o cap.o path.o tunnel.o eeprom.o
 thunderbolt-objs += domain.o dma_port.o icm.o property.o xdomain.o lc.o

drivers/thunderbolt/ctl.c

@@ -930,6 +930,23 @@ struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer,
 	return res;
 }
 
+static int tb_cfg_get_error(struct tb_ctl *ctl, enum tb_cfg_space space,
+			    const struct tb_cfg_result *res)
+{
+	/*
+	 * For unimplemented ports access to port config space may return
+	 * TB_CFG_ERROR_INVALID_CONFIG_SPACE (alternatively their type is
+	 * set to TB_TYPE_INACTIVE). In the former case return -ENODEV so
+	 * that the caller can mark the port as disabled.
+	 */
+	if (space == TB_CFG_PORT &&
+	    res->tb_error == TB_CFG_ERROR_INVALID_CONFIG_SPACE)
+		return -ENODEV;
+
+	tb_cfg_print_error(ctl, res);
+	return -EIO;
+}
+
 int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
 		enum tb_cfg_space space, u32 offset, u32 length)
 {
@@ -942,8 +959,7 @@ int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
 
 	case 1:
 		/* Thunderbolt error, tb_error holds the actual number */
-		tb_cfg_print_error(ctl, &res);
-		return -EIO;
+		return tb_cfg_get_error(ctl, space, &res);
 
 	case -ETIMEDOUT:
 		tb_ctl_warn(ctl, "timeout reading config space %u from %#x\n",
@@ -969,8 +985,7 @@ int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port,
 
 	case 1:
 		/* Thunderbolt error, tb_error holds the actual number */
-		tb_cfg_print_error(ctl, &res);
-		return -EIO;
+		return tb_cfg_get_error(ctl, space, &res);
 
 	case -ETIMEDOUT:
 		tb_ctl_warn(ctl, "timeout writing config space %u to %#x\n",

drivers/thunderbolt/eeprom.c

@@ -414,7 +414,7 @@ static int tb_drom_copy_efi(struct tb_switch *sw, u16 *size)
 	struct device *dev = &sw->tb->nhi->pdev->dev;
 	int len, res;
 
-	len = device_property_read_u8_array(dev, "ThunderboltDROM", NULL, 0);
+	len = device_property_count_u8(dev, "ThunderboltDROM");
 	if (len < 0 || len < sizeof(struct tb_drom_header))
 		return -EINVAL;
 
@@ -525,10 +525,6 @@ int tb_drom_read(struct tb_switch *sw)
 		sw->ports[3].dual_link_port = &sw->ports[4];
 		sw->ports[4].dual_link_port = &sw->ports[3];
 
-		/* Port 5 is inaccessible on this gen 1 controller */
-		if (sw->config.device_id == PCI_DEVICE_ID_INTEL_LIGHT_RIDGE)
-			sw->ports[5].disabled = true;
-
 		return 0;
 	}
 

drivers/thunderbolt/icm.c

@@ -55,16 +55,20 @@
  * @safe_mode: ICM is in safe mode
  * @max_boot_acl: Maximum number of preboot ACL entries (%0 if not supported)
  * @rpm: Does the controller support runtime PM (RTD3)
+ * @can_upgrade_nvm: Can the NVM firmware be upgrade on this controller
+ * @veto: Is RTD3 veto in effect
  * @is_supported: Checks if we can support ICM on this controller
  * @cio_reset: Trigger CIO reset
  * @get_mode: Read and return the ICM firmware mode (optional)
  * @get_route: Find a route string for given switch
  * @save_devices: Ask ICM to save devices to ACL when suspending (optional)
  * @driver_ready: Send driver ready message to ICM
+ * @set_uuid: Set UUID for the root switch (optional)
  * @device_connected: Handle device connected ICM message
  * @device_disconnected: Handle device disconnected ICM message
  * @xdomain_connected - Handle XDomain connected ICM message
  * @xdomain_disconnected - Handle XDomain disconnected ICM message
+ * @rtd3_veto: Handle RTD3 veto notification ICM message
  */
 struct icm {
 	struct mutex request_lock;
@@ -74,6 +78,8 @@ struct icm {
 	int vnd_cap;
 	bool safe_mode;
 	bool rpm;
+	bool can_upgrade_nvm;
+	bool veto;
 	bool (*is_supported)(struct tb *tb);
 	int (*cio_reset)(struct tb *tb);
 	int (*get_mode)(struct tb *tb);
@@ -82,6 +88,7 @@ struct icm {
 	int (*driver_ready)(struct tb *tb,
 			    enum tb_security_level *security_level,
 			    size_t *nboot_acl, bool *rpm);
+	void (*set_uuid)(struct tb *tb);
 	void (*device_connected)(struct tb *tb,
 				 const struct icm_pkg_header *hdr);
 	void (*device_disconnected)(struct tb *tb,
@@ -90,6 +97,7 @@ struct icm {
 				  const struct icm_pkg_header *hdr);
 	void (*xdomain_disconnected)(struct tb *tb,
 				     const struct icm_pkg_header *hdr);
+	void (*rtd3_veto)(struct tb *tb, const struct icm_pkg_header *hdr);
 };
 
 struct icm_notification {
@@ -294,6 +302,43 @@ static int icm_request(struct tb *tb, const void *request, size_t request_size,
 	return -ETIMEDOUT;
 }
 
+/*
+ * If rescan is queued to run (we are resuming), postpone it to give the
+ * firmware some more time to send device connected notifications for next
+ * devices in the chain.
+ */
+static void icm_postpone_rescan(struct tb *tb)
+{
+	struct icm *icm = tb_priv(tb);
+
+	if (delayed_work_pending(&icm->rescan_work))
+		mod_delayed_work(tb->wq, &icm->rescan_work,
+				 msecs_to_jiffies(500));
+}
+
+static void icm_veto_begin(struct tb *tb)
+{
+	struct icm *icm = tb_priv(tb);
+
+	if (!icm->veto) {
+		icm->veto = true;
+		/* Keep the domain powered while veto is in effect */
+		pm_runtime_get(&tb->dev);
+	}
+}
+
+static void icm_veto_end(struct tb *tb)
+{
+	struct icm *icm = tb_priv(tb);
+
+	if (icm->veto) {
+		icm->veto = false;
+		/* Allow the domain suspend now */
+		pm_runtime_mark_last_busy(&tb->dev);
+		pm_runtime_put_autosuspend(&tb->dev);
+	}
+}
+
 static bool icm_fr_is_supported(struct tb *tb)
 {
 	return !x86_apple_machine;
@@ -517,14 +562,16 @@ static int icm_fr_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd)
 	return 0;
 }
 
-static void add_switch(struct tb_switch *parent_sw, u64 route,
+static struct tb_switch *add_switch(struct tb_switch *parent_sw, u64 route,
 				    const uuid_t *uuid, const u8 *ep_name,
-		       size_t ep_name_size, u8 connection_id, u8 connection_key,
-		       u8 link, u8 depth, enum tb_security_level security_level,
+				    size_t ep_name_size, u8 connection_id,
+				    u8 connection_key, u8 link, u8 depth,
+				    enum tb_security_level security_level,
 				    bool authorized, bool boot)
 {
 	const struct intel_vss *vss;
 	struct tb_switch *sw;
+	int ret;
 
 	pm_runtime_get_sync(&parent_sw->dev);
 
@@ -555,14 +602,18 @@ static void add_switch(struct tb_switch *parent_sw, u64 route,
 	tb_port_at(route, parent_sw)->remote = tb_upstream_port(sw);
 	tb_upstream_port(sw)->remote = tb_port_at(route, parent_sw);
 
-	if (tb_switch_add(sw)) {
+	ret = tb_switch_add(sw);
+	if (ret) {
 		tb_port_at(tb_route(sw), parent_sw)->remote = NULL;
 		tb_switch_put(sw);
+		sw = ERR_PTR(ret);
 	}
 
 out:
 	pm_runtime_mark_last_busy(&parent_sw->dev);
 	pm_runtime_put_autosuspend(&parent_sw->dev);
+
+	return sw;
 }
 
 static void update_switch(struct tb_switch *parent_sw, struct tb_switch *sw,
@@ -654,6 +705,8 @@ icm_fr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
 	u64 route;
 	int ret;
 
+	icm_postpone_rescan(tb);
+
 	link = pkg->link_info & ICM_LINK_INFO_LINK_MASK;
 	depth = (pkg->link_info & ICM_LINK_INFO_DEPTH_MASK) >>
 		ICM_LINK_INFO_DEPTH_SHIFT;
@@ -1084,7 +1137,8 @@ static int icm_tr_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd)
 }
 
 static void
-icm_tr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
+__icm_tr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr,
+			  bool force_rtd3)
 {
 	const struct icm_tr_event_device_connected *pkg =
 		(const struct icm_tr_event_device_connected *)hdr;
@@ -1094,6 +1148,8 @@ icm_tr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
 	bool authorized, boot;
 	u64 route;
 
+	icm_postpone_rescan(tb);
+
 	/*
 	 * Currently we don't use the QoS information coming with the
 	 * device connected message so simply just ignore that extra
@@ -1149,13 +1205,21 @@ icm_tr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
 		return;
 	}
 
-	add_switch(parent_sw, route, &pkg->ep_uuid, (const u8 *)pkg->ep_name,
-		   sizeof(pkg->ep_name), pkg->connection_id,
-		   0, 0, 0, security_level, authorized, boot);
+	sw = add_switch(parent_sw, route, &pkg->ep_uuid, (const u8 *)pkg->ep_name,
+			sizeof(pkg->ep_name), pkg->connection_id, 0, 0, 0,
+			security_level, authorized, boot);
+	if (!IS_ERR(sw) && force_rtd3)
+		sw->rpm = true;
 
 	tb_switch_put(parent_sw);
 }
 
+static void
+icm_tr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
+{
+	__icm_tr_device_connected(tb, hdr, false);
+}
+
 static void
 icm_tr_device_disconnected(struct tb *tb, const struct icm_pkg_header *hdr)
 {
@@ -1466,6 +1530,61 @@ static int icm_ar_set_boot_acl(struct tb *tb, const uuid_t *uuids,
 	return 0;
 }
 
+static int
+icm_icl_driver_ready(struct tb *tb, enum tb_security_level *security_level,
+		    size_t *nboot_acl, bool *rpm)
+{
+	struct icm_tr_pkg_driver_ready_response reply;
+	struct icm_pkg_driver_ready request = {
+		.hdr.code = ICM_DRIVER_READY,
+	};
+	int ret;
+
+	memset(&reply, 0, sizeof(reply));
+	ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply),
+			  1, 20000);
+	if (ret)
+		return ret;
+
+	/* Ice Lake always supports RTD3 */
+	if (rpm)
+		*rpm = true;
+
+	return 0;
+}
+
+static void icm_icl_set_uuid(struct tb *tb)
+{
+	struct tb_nhi *nhi = tb->nhi;
+	u32 uuid[4];
+
+	pci_read_config_dword(nhi->pdev, VS_CAP_10, &uuid[0]);
+	pci_read_config_dword(nhi->pdev, VS_CAP_11, &uuid[1]);
+	uuid[2] = 0xffffffff;
+	uuid[3] = 0xffffffff;
+
+	tb->root_switch->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
+}
+
+static void
+icm_icl_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
+{
+	__icm_tr_device_connected(tb, hdr, true);
+}
+
+static void icm_icl_rtd3_veto(struct tb *tb, const struct icm_pkg_header *hdr)
+{
+	const struct icm_icl_event_rtd3_veto *pkg =
+		(const struct icm_icl_event_rtd3_veto *)hdr;
+
+	tb_dbg(tb, "ICM rtd3 veto=0x%08x\n", pkg->veto_reason);
+
+	if (pkg->veto_reason)
+		icm_veto_begin(tb);
+	else
+		icm_veto_end(tb);
+}
+
 static void icm_handle_notification(struct work_struct *work)
 {
 	struct icm_notification *n = container_of(work, typeof(*n), work);
@@ -1493,6 +1612,9 @@ static void icm_handle_notification(struct work_struct *work)
 		case ICM_EVENT_XDOMAIN_DISCONNECTED:
 			icm->xdomain_disconnected(tb, n->pkg);
 			break;
+		case ICM_EVENT_RTD3_VETO:
+			icm->rtd3_veto(tb, n->pkg);
+			break;
 		}
 	}
 
@@ -1851,6 +1973,13 @@ static void icm_complete(struct tb *tb)
 	if (tb->nhi->going_away)
 		return;
 
+	/*
+	 * If RTD3 was vetoed before we entered system suspend allow it
+	 * again now before driver ready is sent. Firmware sends a new RTD3
+	 * veto if it is still the case after we have sent it driver ready
+	 * command.
+	 */
+	icm_veto_end(tb);
 	icm_unplug_children(tb->root_switch);
 
 	/*
@@ -1913,14 +2042,12 @@ static int icm_start(struct tb *tb)
 	if (IS_ERR(tb->root_switch))
 		return PTR_ERR(tb->root_switch);
 
-	/*
-	 * NVM upgrade has not been tested on Apple systems and they
-	 * don't provide images publicly either. To be on the safe side
-	 * prevent root switch NVM upgrade on Macs for now.
-	 */
-	tb->root_switch->no_nvm_upgrade = x86_apple_machine;
+	tb->root_switch->no_nvm_upgrade = !icm->can_upgrade_nvm;
 	tb->root_switch->rpm = icm->rpm;
 
+	if (icm->set_uuid)
+		icm->set_uuid(tb);
+
 	ret = tb_switch_add(tb->root_switch);
 	if (ret) {
 		tb_switch_put(tb->root_switch);
@@ -2005,6 +2132,19 @@ static const struct tb_cm_ops icm_tr_ops = {
 	.disconnect_xdomain_paths = icm_tr_disconnect_xdomain_paths,
 };
 
+/* Ice Lake */
+static const struct tb_cm_ops icm_icl_ops = {
+	.driver_ready = icm_driver_ready,
+	.start = icm_start,
+	.stop = icm_stop,
+	.complete = icm_complete,
+	.runtime_suspend = icm_runtime_suspend,
+	.runtime_resume = icm_runtime_resume,
+	.handle_event = icm_handle_event,
+	.approve_xdomain_paths = icm_tr_approve_xdomain_paths,
+	.disconnect_xdomain_paths = icm_tr_disconnect_xdomain_paths,
+};
+
 struct tb *icm_probe(struct tb_nhi *nhi)
 {
 	struct icm *icm;
@@ -2021,6 +2161,7 @@ struct tb *icm_probe(struct tb_nhi *nhi)
 	switch (nhi->pdev->device) {
 	case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI:
 	case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI:
+		icm->can_upgrade_nvm = true;
 		icm->is_supported = icm_fr_is_supported;
 		icm->get_route = icm_fr_get_route;
 		icm->save_devices = icm_fr_save_devices;
@@ -2038,6 +2179,13 @@ struct tb *icm_probe(struct tb_nhi *nhi)
 	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI:
 	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI:
 		icm->max_boot_acl = ICM_AR_PREBOOT_ACL_ENTRIES;
+		/*
+		 * NVM upgrade has not been tested on Apple systems and
+		 * they don't provide images publicly either. To be on
+		 * the safe side prevent root switch NVM upgrade on Macs
+		 * for now.
+		 */
+		icm->can_upgrade_nvm = !x86_apple_machine;
 		icm->is_supported = icm_ar_is_supported;
 		icm->cio_reset = icm_ar_cio_reset;
 		icm->get_mode = icm_ar_get_mode;
@@ -2054,6 +2202,7 @@ struct tb *icm_probe(struct tb_nhi *nhi)
 	case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_NHI:
 	case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_NHI:
 		icm->max_boot_acl = ICM_AR_PREBOOT_ACL_ENTRIES;
+		icm->can_upgrade_nvm = !x86_apple_machine;
 		icm->is_supported = icm_ar_is_supported;
 		icm->cio_reset = icm_tr_cio_reset;
 		icm->get_mode = icm_ar_get_mode;
@@ -2064,6 +2213,19 @@ struct tb *icm_probe(struct tb_nhi *nhi)
 		icm->xdomain_disconnected = icm_tr_xdomain_disconnected;
 		tb->cm_ops = &icm_tr_ops;
 		break;
+
+	case PCI_DEVICE_ID_INTEL_ICL_NHI0:
+	case PCI_DEVICE_ID_INTEL_ICL_NHI1:
+		icm->is_supported = icm_ar_is_supported;
+		icm->driver_ready = icm_icl_driver_ready;
+		icm->set_uuid = icm_icl_set_uuid;
+		icm->device_connected = icm_icl_device_connected;
+		icm->device_disconnected = icm_tr_device_disconnected;
+		icm->xdomain_connected = icm_tr_xdomain_connected;
+		icm->xdomain_disconnected = icm_tr_xdomain_disconnected;
+		icm->rtd3_veto = icm_icl_rtd3_veto;
+		tb->cm_ops = &icm_icl_ops;
+		break;
 	}
 
 	if (!icm->is_supported || !icm->is_supported(tb)) {

drivers/thunderbolt/nhi.c

@@ -16,6 +16,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/delay.h>
+#include <linux/property.h>
 
 #include "nhi.h"
 #include "nhi_regs.h"
@@ -143,9 +144,20 @@ static void __iomem *ring_options_base(struct tb_ring *ring)
 	return io;
 }
 
-static void ring_iowrite16desc(struct tb_ring *ring, u32 value, u32 offset)
+static void ring_iowrite_cons(struct tb_ring *ring, u16 cons)
 {
-	iowrite16(value, ring_desc_base(ring) + offset);
+	/*
+	 * The other 16-bits in the register is read-only and writes to it
+	 * are ignored by the hardware so we can save one ioread32() by
+	 * filling the read-only bits with zeroes.
+	 */
+	iowrite32(cons, ring_desc_base(ring) + 8);
+}
+
+static void ring_iowrite_prod(struct tb_ring *ring, u16 prod)
+{
+	/* See ring_iowrite_cons() above for explanation */
+	iowrite32(prod << 16, ring_desc_base(ring) + 8);
 }
 
 static void ring_iowrite32desc(struct tb_ring *ring, u32 value, u32 offset)
@@ -197,7 +209,10 @@ static void ring_write_descriptors(struct tb_ring *ring)
 			descriptor->sof = frame->sof;
 		}
 		ring->head = (ring->head + 1) % ring->size;
-		ring_iowrite16desc(ring, ring->head, ring->is_tx ? 10 : 8);
+		if (ring->is_tx)
+			ring_iowrite_prod(ring, ring->head);
+		else
+			ring_iowrite_cons(ring, ring->head);
 	}
 }
 
@@ -662,7 +677,7 @@ void tb_ring_stop(struct tb_ring *ring)
 
 	ring_iowrite32options(ring, 0, 0);
 	ring_iowrite64desc(ring, 0, 0);
-	ring_iowrite16desc(ring, 0, ring->is_tx ? 10 : 8);
+	ring_iowrite32desc(ring, 0, 8);
 	ring_iowrite32desc(ring, 0, 12);
 	ring->head = 0;
 	ring->tail = 0;
@@ -845,12 +860,52 @@ static irqreturn_t nhi_msi(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static int nhi_suspend_noirq(struct device *dev)
+static int __nhi_suspend_noirq(struct device *dev, bool wakeup)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct tb *tb = pci_get_drvdata(pdev);
+	struct tb_nhi *nhi = tb->nhi;
+	int ret;
+
+	ret = tb_domain_suspend_noirq(tb);
+	if (ret)
+		return ret;
+
+	if (nhi->ops && nhi->ops->suspend_noirq) {
+		ret = nhi->ops->suspend_noirq(tb->nhi, wakeup);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int nhi_suspend_noirq(struct device *dev)
+{
+	return __nhi_suspend_noirq(dev, device_may_wakeup(dev));
+}
+
+static bool nhi_wake_supported(struct pci_dev *pdev)
+{
+	u8 val;
+
+	/*
+	 * If power rails are sustainable for wakeup from S4 this
+	 * property is set by the BIOS.
+	 */
+	if (device_property_read_u8(&pdev->dev, "WAKE_SUPPORTED", &val))
+		return !!val;
 
-	return tb_domain_suspend_noirq(tb);
+	return true;
+}
+
+static int nhi_poweroff_noirq(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	bool wakeup;
+
+	wakeup = device_may_wakeup(dev) && nhi_wake_supported(pdev);
+	return __nhi_suspend_noirq(dev, wakeup);
 }
 
 static void nhi_enable_int_throttling(struct tb_nhi *nhi)
@@ -873,16 +928,24 @@ static int nhi_resume_noirq(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct tb *tb = pci_get_drvdata(pdev);
+	struct tb_nhi *nhi = tb->nhi;
+	int ret;
 
 	/*
 	 * Check that the device is still there. It may be that the user
 	 * unplugged last device which causes the host controller to go
 	 * away on PCs.
 	 */
-	if (!pci_device_is_present(pdev))
-		tb->nhi->going_away = true;
-	else
+	if (!pci_device_is_present(pdev)) {
+		nhi->going_away = true;
+	} else {
+		if (nhi->ops && nhi->ops->resume_noirq) {
+			ret = nhi->ops->resume_noirq(nhi);
+			if (ret)
+				return ret;
+		}
 		nhi_enable_int_throttling(tb->nhi);
+	}
 
 	return tb_domain_resume_noirq(tb);
 }
@@ -915,16 +978,35 @@ static int nhi_runtime_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct tb *tb = pci_get_drvdata(pdev);
+	struct tb_nhi *nhi = tb->nhi;
+	int ret;
+
+	ret = tb_domain_runtime_suspend(tb);
+	if (ret)
+		return ret;
 
-	return tb_domain_runtime_suspend(tb);
+	if (nhi->ops && nhi->ops->runtime_suspend) {
+		ret = nhi->ops->runtime_suspend(tb->nhi);
+		if (ret)
+			return ret;
+	}
+	return 0;
 }
 
 static int nhi_runtime_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct tb *tb = pci_get_drvdata(pdev);
+	struct tb_nhi *nhi = tb->nhi;
+	int ret;
 
-	nhi_enable_int_throttling(tb->nhi);
+	if (nhi->ops && nhi->ops->runtime_resume) {
+		ret = nhi->ops->runtime_resume(nhi);
+		if (ret)
+			return ret;
+	}
+
+	nhi_enable_int_throttling(nhi);
 	return tb_domain_runtime_resume(tb);
 }
 
@@ -952,6 +1034,9 @@ static void nhi_shutdown(struct tb_nhi *nhi)
 		flush_work(&nhi->interrupt_work);
 	}
 	ida_destroy(&nhi->msix_ida);
+
+	if (nhi->ops && nhi->ops->shutdown)
+		nhi->ops->shutdown(nhi);
 }
 
 static int nhi_init_msi(struct tb_nhi *nhi)
@@ -996,12 +1081,27 @@ static int nhi_init_msi(struct tb_nhi *nhi)
 	return 0;
 }
 
+static bool nhi_imr_valid(struct pci_dev *pdev)
+{
+	u8 val;
+
+	if (!device_property_read_u8(&pdev->dev, "IMR_VALID", &val))
+		return !!val;
+
+	return true;
+}
+
 static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct tb_nhi *nhi;
 	struct tb *tb;
 	int res;
 
+	if (!nhi_imr_valid(pdev)) {
+		dev_warn(&pdev->dev, "firmware image not valid, aborting\n");
+		return -ENODEV;
+	}
+
 	res = pcim_enable_device(pdev);
 	if (res) {
 		dev_err(&pdev->dev, "cannot enable PCI device, aborting\n");
@@ -1019,6 +1119,7 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return -ENOMEM;
 
 	nhi->pdev = pdev;
+	nhi->ops = (const struct tb_nhi_ops *)id->driver_data;
 	/* cannot fail - table is allocated bin pcim_iomap_regions */
 	nhi->iobase = pcim_iomap_table(pdev)[0];
 	nhi->hop_count = ioread32(nhi->iobase + REG_HOP_COUNT) & 0x3ff;
@@ -1051,6 +1152,12 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	pci_set_master(pdev);
 
+	if (nhi->ops && nhi->ops->init) {
+		res = nhi->ops->init(nhi);
+		if (res)
+			return res;
+	}
+
 	tb = icm_probe(nhi);
 	if (!tb)
 		tb = tb_probe(nhi);
@@ -1111,6 +1218,7 @@ static const struct dev_pm_ops nhi_pm_ops = {
 	.restore_noirq = nhi_resume_noirq,
 	.suspend = nhi_suspend,
 	.freeze = nhi_suspend,
+	.poweroff_noirq = nhi_poweroff_noirq,
 	.poweroff = nhi_suspend,
 	.complete = nhi_complete,
 	.runtime_suspend = nhi_runtime_suspend,
@@ -1158,6 +1266,10 @@ static struct pci_device_id nhi_ids[] = {
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_NHI) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_NHI) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICL_NHI0),
+	  .driver_data = (kernel_ulong_t)&icl_nhi_ops },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICL_NHI1),
+	  .driver_data = (kernel_ulong_t)&icl_nhi_ops },
 
 	{ 0,}
 };

drivers/thunderbolt/nhi.h

@@ -30,6 +30,26 @@ enum nhi_mailbox_cmd {
 int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data);
 enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi);
 
+/**
+ * struct tb_nhi_ops - NHI specific optional operations
+ * @init: NHI specific initialization
+ * @suspend_noirq: NHI specific suspend_noirq hook
+ * @resume_noirq: NHI specific resume_noirq hook
+ * @runtime_suspend: NHI specific runtime_suspend hook
+ * @runtime_resume: NHI specific runtime_resume hook
+ * @shutdown: NHI specific shutdown
+ */
+struct tb_nhi_ops {
+	int (*init)(struct tb_nhi *nhi);
+	int (*suspend_noirq)(struct tb_nhi *nhi, bool wakeup);
+	int (*resume_noirq)(struct tb_nhi *nhi);
+	int (*runtime_suspend)(struct tb_nhi *nhi);
+	int (*runtime_resume)(struct tb_nhi *nhi);
+	void (*shutdown)(struct tb_nhi *nhi);
+};
+
+extern const struct tb_nhi_ops icl_nhi_ops;
+
 /*
  * PCI IDs used in this driver from Win Ridge forward. There is no
  * need for the PCI quirk anymore as we will use ICM also on Apple
@@ -51,5 +71,7 @@ enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi);
 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE	0x15ea
 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_NHI		0x15eb
 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE	0x15ef
+#define PCI_DEVICE_ID_INTEL_ICL_NHI1			0x8a0d
+#define PCI_DEVICE_ID_INTEL_ICL_NHI0			0x8a17
 
 #endif

drivers/thunderbolt/nhi_ops.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NHI specific operations
+ *
+ * Copyright (C) 2019, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/suspend.h>
+
+#include "nhi.h"
+#include "nhi_regs.h"
+#include "tb.h"
+
+/* Ice Lake specific NHI operations */
+
+#define ICL_LC_MAILBOX_TIMEOUT	500 /* ms */
+
+static int check_for_device(struct device *dev, void *data)
+{
+	return tb_is_switch(dev);
+}
+
+static bool icl_nhi_is_device_connected(struct tb_nhi *nhi)
+{
+	struct tb *tb = pci_get_drvdata(nhi->pdev);
+	int ret;
+
+	ret = device_for_each_child(&tb->root_switch->dev, NULL,
+				    check_for_device);
+	return ret > 0;
+}
+
+static int icl_nhi_force_power(struct tb_nhi *nhi, bool power)
+{
+	u32 vs_cap;
+
+	/*
+	 * The Thunderbolt host controller is present always in Ice Lake
+	 * but the firmware may not be loaded and running (depending
+	 * whether there is device connected and so on). Each time the
+	 * controller is used we need to "Force Power" it first and wait
+	 * for the firmware to indicate it is up and running. This "Force
+	 * Power" is really not about actually powering on/off the
+	 * controller so it is accessible even if "Force Power" is off.
+	 *
+	 * The actual power management happens inside shared ACPI power
+	 * resources using standard ACPI methods.
+	 */
+	pci_read_config_dword(nhi->pdev, VS_CAP_22, &vs_cap);
+	if (power) {
+		vs_cap &= ~VS_CAP_22_DMA_DELAY_MASK;
+		vs_cap |= 0x22 << VS_CAP_22_DMA_DELAY_SHIFT;
+		vs_cap |= VS_CAP_22_FORCE_POWER;
+	} else {
+		vs_cap &= ~VS_CAP_22_FORCE_POWER;
+	}
+	pci_write_config_dword(nhi->pdev, VS_CAP_22, vs_cap);
+
+	if (power) {
+		unsigned int retries = 10;
+		u32 val;
+
+		/* Wait until the firmware tells it is up and running */
+		do {
+			pci_read_config_dword(nhi->pdev, VS_CAP_9, &val);
+			if (val & VS_CAP_9_FW_READY)
+				return 0;
+			msleep(250);
+		} while (--retries);
+
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static void icl_nhi_lc_mailbox_cmd(struct tb_nhi *nhi, enum icl_lc_mailbox_cmd cmd)
+{
+	u32 data;
+
+	pci_read_config_dword(nhi->pdev, VS_CAP_19, &data);
+	data = (cmd << VS_CAP_19_CMD_SHIFT) & VS_CAP_19_CMD_MASK;
+	pci_write_config_dword(nhi->pdev, VS_CAP_19, data | VS_CAP_19_VALID);
+}
+
+static int icl_nhi_lc_mailbox_cmd_complete(struct tb_nhi *nhi, int timeout)
+{
+	unsigned long end;
+	u32 data;
+
+	if (!timeout)
+		goto clear;
+
+	end = jiffies + msecs_to_jiffies(timeout);
+	do {
+		pci_read_config_dword(nhi->pdev, VS_CAP_18, &data);
+		if (data & VS_CAP_18_DONE)
+			goto clear;
+		msleep(100);
+	} while (time_before(jiffies, end));
+
+	return -ETIMEDOUT;
+
+clear:
+	/* Clear the valid bit */
+	pci_write_config_dword(nhi->pdev, VS_CAP_19, 0);
+	return 0;
+}
+
+static void icl_nhi_set_ltr(struct tb_nhi *nhi)
+{
+	u32 max_ltr, ltr;
+
+	pci_read_config_dword(nhi->pdev, VS_CAP_16, &max_ltr);
+	max_ltr &= 0xffff;
+	/* Program the same value for both snoop and no-snoop */
+	ltr = max_ltr << 16 | max_ltr;
+	pci_write_config_dword(nhi->pdev, VS_CAP_15, ltr);
+}
+
+static int icl_nhi_suspend(struct tb_nhi *nhi)
+{
+	int ret;
+
+	if (icl_nhi_is_device_connected(nhi))
+		return 0;
+
+	/*
+	 * If there is no device connected we need to perform both: a
+	 * handshake through LC mailbox and force power down before
+	 * entering D3.
+	 */
+	icl_nhi_lc_mailbox_cmd(nhi, ICL_LC_PREPARE_FOR_RESET);
+	ret = icl_nhi_lc_mailbox_cmd_complete(nhi, ICL_LC_MAILBOX_TIMEOUT);
+	if (ret)
+		return ret;
+
+	return icl_nhi_force_power(nhi, false);
+}
+
+static int icl_nhi_suspend_noirq(struct tb_nhi *nhi, bool wakeup)
+{
+	enum icl_lc_mailbox_cmd cmd;
+
+	if (!pm_suspend_via_firmware())
+		return icl_nhi_suspend(nhi);
+
+	cmd = wakeup ? ICL_LC_GO2SX : ICL_LC_GO2SX_NO_WAKE;
+	icl_nhi_lc_mailbox_cmd(nhi, cmd);
+	return icl_nhi_lc_mailbox_cmd_complete(nhi, ICL_LC_MAILBOX_TIMEOUT);
+}
+
+static int icl_nhi_resume(struct tb_nhi *nhi)
+{
+	int ret;
+
+	ret = icl_nhi_force_power(nhi, true);
+	if (ret)
+		return ret;
+
+	icl_nhi_set_ltr(nhi);
+	return 0;
+}
+
+static void icl_nhi_shutdown(struct tb_nhi *nhi)
+{
+	icl_nhi_force_power(nhi, false);
+}
+
+const struct tb_nhi_ops icl_nhi_ops = {
+	.init = icl_nhi_resume,
+	.suspend_noirq = icl_nhi_suspend_noirq,
+	.resume_noirq = icl_nhi_resume,
+	.runtime_suspend = icl_nhi_suspend,
+	.runtime_resume = icl_nhi_resume,
+	.shutdown = icl_nhi_shutdown,
+};

drivers/thunderbolt/nhi_regs.h

@@ -124,4 +124,41 @@ struct ring_desc {
 #define REG_FW_STS_ICM_EN_INVERT	BIT(1)
 #define REG_FW_STS_ICM_EN		BIT(0)
 
+/* ICL NHI VSEC registers */
+
+/* FW ready */
+#define VS_CAP_9			0xc8
+#define VS_CAP_9_FW_READY		BIT(31)
+/* UUID */
+#define VS_CAP_10			0xcc
+#define VS_CAP_11			0xd0
+/* LTR */
+#define VS_CAP_15			0xe0
+#define VS_CAP_16			0xe4
+/* TBT2PCIe */
+#define VS_CAP_18			0xec
+#define VS_CAP_18_DONE			BIT(0)
+/* PCIe2TBT */
+#define VS_CAP_19			0xf0
+#define VS_CAP_19_VALID			BIT(0)
+#define VS_CAP_19_CMD_SHIFT		1
+#define VS_CAP_19_CMD_MASK		GENMASK(7, 1)
+/* Force power */
+#define VS_CAP_22			0xfc
+#define VS_CAP_22_FORCE_POWER		BIT(1)
+#define VS_CAP_22_DMA_DELAY_MASK	GENMASK(31, 24)
+#define VS_CAP_22_DMA_DELAY_SHIFT	24
+
+/**
+ * enum icl_lc_mailbox_cmd - ICL specific LC mailbox commands
+ * @ICL_LC_GO2SX: Ask LC to enter Sx without wake
+ * @ICL_LC_GO2SX_NO_WAKE: Ask LC to enter Sx with wake
+ * @ICL_LC_PREPARE_FOR_RESET: Prepare LC for reset
+ */
+enum icl_lc_mailbox_cmd {
+	ICL_LC_GO2SX = 0x02,
+	ICL_LC_GO2SX_NO_WAKE = 0x03,
+	ICL_LC_PREPARE_FOR_RESET = 0x21,
+};
+
 #endif

drivers/thunderbolt/switch.c

@@ -364,12 +364,14 @@ static int tb_switch_nvm_add(struct tb_switch *sw)
 		nvm->active = nvm_dev;
 	}
 
+	if (!sw->no_nvm_upgrade) {
 		nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false);
 		if (IS_ERR(nvm_dev)) {
 			ret = PTR_ERR(nvm_dev);
 			goto err_nvm_active;
 		}
 		nvm->non_active = nvm_dev;
+	}
 
 	sw->nvm = nvm;
 	return 0;
@@ -398,6 +400,7 @@ static void tb_switch_nvm_remove(struct tb_switch *sw)
 	if (!nvm->authenticating)
 		nvm_clear_auth_status(sw);
 
+	if (nvm->non_active)
 		nvmem_unregister(nvm->non_active);
 	if (nvm->active)
 		nvmem_unregister(nvm->active);
@@ -611,8 +614,14 @@ static int tb_init_port(struct tb_port *port)
 	int cap;
 
 	res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
-	if (res)
+	if (res) {
+		if (res == -ENODEV) {
+			tb_dbg(port->sw->tb, " Port %d: not implemented\n",
+			       port->port);
+			return 0;
+		}
 		return res;
+	}
 
 	/* Port 0 is the switch itself and has no PHY. */
 	if (port->config.type == TB_TYPE_PORT && port->port != 0) {
@@ -1331,14 +1340,29 @@ static umode_t switch_attr_is_visible(struct kobject *kobj,
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct tb_switch *sw = tb_to_switch(dev);
 
-	if (attr == &dev_attr_key.attr) {
+	if (attr == &dev_attr_device.attr) {
+		if (!sw->device)
+			return 0;
+	} else if (attr == &dev_attr_device_name.attr) {
+		if (!sw->device_name)
+			return 0;
+	} else if (attr == &dev_attr_vendor.attr)  {
+		if (!sw->vendor)
+			return 0;
+	} else if (attr == &dev_attr_vendor_name.attr)  {
+		if (!sw->vendor_name)
+			return 0;
+	} else if (attr == &dev_attr_key.attr) {
 		if (tb_route(sw) &&
 		    sw->tb->security_level == TB_SECURITY_SECURE &&
 		    sw->security_level == TB_SECURITY_SECURE)
 			return attr->mode;
 		return 0;
-	} else if (attr == &dev_attr_nvm_authenticate.attr ||
-		   attr == &dev_attr_nvm_version.attr) {
+	} else if (attr == &dev_attr_nvm_authenticate.attr) {
+		if (sw->dma_port && !sw->no_nvm_upgrade)
+			return attr->mode;
+		return 0;
+	} else if (attr == &dev_attr_nvm_version.attr) {
 		if (sw->dma_port)
 			return attr->mode;
 		return 0;
@@ -1446,6 +1470,8 @@ static int tb_switch_get_generation(struct tb_switch *sw)
 	case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
 	case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
 	case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
+	case PCI_DEVICE_ID_INTEL_ICL_NHI0:
+	case PCI_DEVICE_ID_INTEL_ICL_NHI1:
 		return 3;
 
 	default:
@@ -1689,13 +1715,17 @@ static int tb_switch_add_dma_port(struct tb_switch *sw)
 		break;
 	}
 
-	if (sw->no_nvm_upgrade)
+	/* Root switch DMA port requires running firmware */
+	if (!tb_route(sw) && sw->config.enabled)
 		return 0;
 
 	sw->dma_port = dma_port_alloc(sw);
 	if (!sw->dma_port)
 		return 0;
 
+	if (sw->no_nvm_upgrade)
+		return 0;
+
 	/*
 	 * Check status of the previous flash authentication. If there
 	 * is one we need to power cycle the switch in any case to make

drivers/thunderbolt/tb_msgs.h

@@ -104,10 +104,11 @@ enum icm_pkg_code {
 };
 
 enum icm_event_code {
-	ICM_EVENT_DEVICE_CONNECTED = 3,
-	ICM_EVENT_DEVICE_DISCONNECTED = 4,
-	ICM_EVENT_XDOMAIN_CONNECTED = 6,
-	ICM_EVENT_XDOMAIN_DISCONNECTED = 7,
+	ICM_EVENT_DEVICE_CONNECTED = 0x3,
+	ICM_EVENT_DEVICE_DISCONNECTED = 0x4,
+	ICM_EVENT_XDOMAIN_CONNECTED = 0x6,
+	ICM_EVENT_XDOMAIN_DISCONNECTED = 0x7,
+	ICM_EVENT_RTD3_VETO = 0xa,
 };
 
 struct icm_pkg_header {
@@ -463,6 +464,13 @@ struct icm_tr_pkg_disconnect_xdomain_response {
 	uuid_t remote_uuid;
 };
 
+/* Ice Lake messages */
+
+struct icm_icl_event_rtd3_veto {
+	struct icm_pkg_header hdr;
+	u32 veto_reason;
+};
+
 /* XDomain messages */
 
 struct tb_xdomain_header {

drivers/thunderbolt/tunnel.c

@@ -211,7 +211,7 @@ struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
 		return NULL;
 	}
 	tb_pci_init_path(path);
-	tunnel->paths[TB_PCI_PATH_UP] = path;
+	tunnel->paths[TB_PCI_PATH_DOWN] = path;
 
 	path = tb_path_alloc(tb, up, TB_PCI_HOPID, down, TB_PCI_HOPID, 0,
 			     "PCIe Up");
@@ -220,7 +220,7 @@ struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
 		return NULL;
 	}
 	tb_pci_init_path(path);
-	tunnel->paths[TB_PCI_PATH_DOWN] = path;
+	tunnel->paths[TB_PCI_PATH_UP] = path;
 
 	return tunnel;
 }

drivers/thunderbolt/xdomain.c

@@ -636,7 +636,7 @@ static ssize_t key_show(struct device *dev, struct device_attribute *attr,
 	 * It should be null terminated but anything else is pretty much
 	 * allowed.
 	 */
-	return sprintf(buf, "%*pEp\n", (int)strlen(svc->key), svc->key);
+	return sprintf(buf, "%*pE\n", (int)strlen(svc->key), svc->key);
 }
 static DEVICE_ATTR_RO(key);
 

include/linux/thunderbolt.h

@@ -429,6 +429,7 @@ static inline struct tb_xdomain *tb_service_parent(struct tb_service *svc)
  * @lock: Must be held during ring creation/destruction. Is acquired by
  *	  interrupt_work when dispatching interrupts to individual rings.
  * @pdev: Pointer to the PCI device
+ * @ops: NHI specific optional ops
  * @iobase: MMIO space of the NHI
  * @tx_rings: All Tx rings available on this host controller
  * @rx_rings: All Rx rings available on this host controller
@@ -442,6 +443,7 @@ static inline struct tb_xdomain *tb_service_parent(struct tb_service *svc)
 struct tb_nhi {
 	spinlock_t lock;
 	struct pci_dev *pdev;
+	const struct tb_nhi_ops *ops;
 	void __iomem *iobase;
 	struct tb_ring **tx_rings;
 	struct tb_ring **rx_rings;