From 5b063995de950d45edecf25a3eac5d8a44bd0ab9 Mon Sep 17 00:00:00 2001
From: Tomas Winkler <tomas.winkler@intel.com>
Date: Thu, 8 Sep 2022 00:51:03 +0300
Subject: mei: gsc: use polling instead of interrupts

A work-around for a HW issue in XEHPSDV that manifests itself when SW reads
a gsc register when gsc is sending an interrupt. The work-around is
to disable interrupts and to use polling instead.

Cc: James Ausmus <james.ausmus@intel.com>
Signed-off-by: Vitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-7-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/gsc-me.c | 48 ++++++++++++++++++++++------
 drivers/misc/mei/hw-me.c  | 80 ++++++++++++++++++++++++++++++++++++++++++++---
 drivers/misc/mei/hw-me.h  | 15 ++++++++-
 3 files changed, 128 insertions(+), 15 deletions(-)

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index c8145e9b62b6..2caba3a9ac35 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -13,6 +13,7 @@
 #include <linux/ktime.h>
 #include <linux/delay.h>
 #include <linux/pm_runtime.h>
+#include <linux/kthread.h>
 
 #include "mei_dev.h"
 #include "hw-me.h"
@@ -66,13 +67,28 @@ static int mei_gsc_probe(struct auxiliary_device *aux_dev,
 
 	dev_set_drvdata(device, dev);
 
-	ret = devm_request_threaded_irq(device, hw->irq,
-					mei_me_irq_quick_handler,
-					mei_me_irq_thread_handler,
-					IRQF_ONESHOT, KBUILD_MODNAME, dev);
-	if (ret) {
-		dev_err(device, "irq register failed %d\n", ret);
-		goto err;
+	/* use polling */
+	if (mei_me_hw_use_polling(hw)) {
+		mei_disable_interrupts(dev);
+		mei_clear_interrupts(dev);
+		init_waitqueue_head(&hw->wait_active);
+		hw->is_active = true; /* start in active mode for initialization */
+		hw->polling_thread = kthread_run(mei_me_polling_thread, dev,
+						 "kmegscirqd/%s", dev_name(device));
+		if (IS_ERR(hw->polling_thread)) {
+			ret = PTR_ERR(hw->polling_thread);
+			dev_err(device, "unable to create kernel thread: %d\n", ret);
+			goto err;
+		}
+	} else {
+		ret = devm_request_threaded_irq(device, hw->irq,
+						mei_me_irq_quick_handler,
+						mei_me_irq_thread_handler,
+						IRQF_ONESHOT, KBUILD_MODNAME, dev);
+		if (ret) {
+			dev_err(device, "irq register failed %d\n", ret);
+			goto err;
+		}
 	}
 
 	pm_runtime_get_noresume(device);
@@ -98,7 +114,8 @@ static int mei_gsc_probe(struct auxiliary_device *aux_dev,
 
 register_err:
 	mei_stop(dev);
-	devm_free_irq(device, hw->irq, dev);
+	if (!mei_me_hw_use_polling(hw))
+		devm_free_irq(device, hw->irq, dev);
 
 err:
 	dev_err(device, "probe failed: %d\n", ret);
@@ -119,12 +136,17 @@ static void mei_gsc_remove(struct auxiliary_device *aux_dev)
 
 	mei_stop(dev);
 
+	hw = to_me_hw(dev);
+	if (mei_me_hw_use_polling(hw))
+		kthread_stop(hw->polling_thread);
+
 	mei_deregister(dev);
 
 	pm_runtime_disable(&aux_dev->dev);
 
 	mei_disable_interrupts(dev);
-	devm_free_irq(&aux_dev->dev, hw->irq, dev);
+	if (!mei_me_hw_use_polling(hw))
+		devm_free_irq(&aux_dev->dev, hw->irq, dev);
 }
 
 static int __maybe_unused mei_gsc_pm_suspend(struct device *device)
@@ -185,6 +207,9 @@ static int  __maybe_unused mei_gsc_pm_runtime_suspend(struct device *device)
 	if (mei_write_is_idle(dev)) {
 		hw = to_me_hw(dev);
 		hw->pg_state = MEI_PG_ON;
+
+		if (mei_me_hw_use_polling(hw))
+			hw->is_active = false;
 		ret = 0;
 	} else {
 		ret = -EAGAIN;
@@ -209,6 +234,11 @@ static int __maybe_unused mei_gsc_pm_runtime_resume(struct device *device)
 	hw = to_me_hw(dev);
 	hw->pg_state = MEI_PG_OFF;
 
+	if (mei_me_hw_use_polling(hw)) {
+		hw->is_active = true;
+		wake_up(&hw->wait_active);
+	}
+
 	mutex_unlock(&dev->device_lock);
 
 	irq_ret = mei_me_irq_thread_handler(1, dev);
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 9870bf717979..1703e197ba62 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -10,6 +10,7 @@
 #include <linux/interrupt.h>
 #include <linux/pm_runtime.h>
 #include <linux/sizes.h>
+#include <linux/delay.h>
 
 #include "mei_dev.h"
 #include "hbm.h"
@@ -327,9 +328,12 @@ static void mei_me_intr_clear(struct mei_device *dev)
  */
 static void mei_me_intr_enable(struct mei_device *dev)
 {
-	u32 hcsr = mei_hcsr_read(dev);
+	u32 hcsr;
+
+	if (mei_me_hw_use_polling(to_me_hw(dev)))
+		return;
 
-	hcsr |= H_CSR_IE_MASK;
+	hcsr = mei_hcsr_read(dev) | H_CSR_IE_MASK;
 	mei_hcsr_set(dev, hcsr);
 }
 
@@ -354,6 +358,9 @@ static void mei_me_synchronize_irq(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
 
+	if (mei_me_hw_use_polling(hw))
+		return;
+
 	synchronize_irq(hw->irq);
 }
 
@@ -380,7 +387,10 @@ static void mei_me_host_set_ready(struct mei_device *dev)
 {
 	u32 hcsr = mei_hcsr_read(dev);
 
-	hcsr |= H_CSR_IE_MASK | H_IG | H_RDY;
+	if (!mei_me_hw_use_polling(to_me_hw(dev)))
+		hcsr |= H_CSR_IE_MASK;
+
+	hcsr |=  H_IG | H_RDY;
 	mei_hcsr_set(dev, hcsr);
 }
 
@@ -1174,7 +1184,7 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
 
 	hcsr |= H_RST | H_IG | H_CSR_IS_MASK;
 
-	if (!intr_enable)
+	if (!intr_enable || mei_me_hw_use_polling(to_me_hw(dev)))
 		hcsr &= ~H_CSR_IE_MASK;
 
 	dev->recvd_hw_ready = false;
@@ -1329,6 +1339,66 @@ end:
 }
 EXPORT_SYMBOL_GPL(mei_me_irq_thread_handler);
 
+#define MEI_POLLING_TIMEOUT_ACTIVE 100
+#define MEI_POLLING_TIMEOUT_IDLE   500
+
+/**
+ * mei_me_polling_thread - interrupt register polling thread
+ *
+ * The thread monitors the interrupt source register and calls
+ * mei_me_irq_thread_handler() to handle the firmware
+ * input.
+ *
+ * The function polls in MEI_POLLING_TIMEOUT_ACTIVE timeout
+ * in case there was an event, in idle case the polling
+ * time increases yet again by MEI_POLLING_TIMEOUT_ACTIVE
+ * up to MEI_POLLING_TIMEOUT_IDLE.
+ *
+ * @_dev: mei device
+ *
+ * Return: always 0
+ */
+int mei_me_polling_thread(void *_dev)
+{
+	struct mei_device *dev = _dev;
+	irqreturn_t irq_ret;
+	long polling_timeout = MEI_POLLING_TIMEOUT_ACTIVE;
+
+	dev_dbg(dev->dev, "kernel thread is running\n");
+	while (!kthread_should_stop()) {
+		struct mei_me_hw *hw = to_me_hw(dev);
+		u32 hcsr;
+
+		wait_event_timeout(hw->wait_active,
+				   hw->is_active || kthread_should_stop(),
+				   msecs_to_jiffies(MEI_POLLING_TIMEOUT_IDLE));
+
+		if (kthread_should_stop())
+			break;
+
+		hcsr = mei_hcsr_read(dev);
+		if (me_intr_src(hcsr)) {
+			polling_timeout = MEI_POLLING_TIMEOUT_ACTIVE;
+			irq_ret = mei_me_irq_thread_handler(1, dev);
+			if (irq_ret != IRQ_HANDLED)
+				dev_err(dev->dev, "irq_ret %d\n", irq_ret);
+		} else {
+			/*
+			 * Increase timeout by MEI_POLLING_TIMEOUT_ACTIVE
+			 * up to MEI_POLLING_TIMEOUT_IDLE
+			 */
+			polling_timeout = clamp_val(polling_timeout + MEI_POLLING_TIMEOUT_ACTIVE,
+						    MEI_POLLING_TIMEOUT_ACTIVE,
+						    MEI_POLLING_TIMEOUT_IDLE);
+		}
+
+		schedule_timeout_interruptible(msecs_to_jiffies(polling_timeout));
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mei_me_polling_thread);
+
 static const struct mei_hw_ops mei_me_hw_ops = {
 
 	.trc_status = mei_me_trc_status,
diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h
index a071c645e905..6256b36bdafd 100644
--- a/drivers/misc/mei/hw-me.h
+++ b/drivers/misc/mei/hw-me.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (c) 2012-2020, Intel Corporation. All rights reserved.
+ * Copyright (c) 2012-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -51,6 +51,9 @@ struct mei_cfg {
  * @d0i3_supported: di03 support
  * @hbuf_depth: depth of hardware host/write buffer in slots
  * @read_fws: read FW status register handler
+ * @polling_thread: interrupt polling thread
+ * @wait_active: the polling thread activity wait queue
+ * @is_active: the device is active
  */
 struct mei_me_hw {
 	const struct mei_cfg *cfg;
@@ -60,10 +63,19 @@ struct mei_me_hw {
 	bool d0i3_supported;
 	u8 hbuf_depth;
 	int (*read_fws)(const struct mei_device *dev, int where, u32 *val);
+	/* polling */
+	struct task_struct *polling_thread;
+	wait_queue_head_t wait_active;
+	bool is_active;
 };
 
 #define to_me_hw(dev) (struct mei_me_hw *)((dev)->hw)
 
+static inline bool mei_me_hw_use_polling(const struct mei_me_hw *hw)
+{
+	return hw->irq < 0;
+}
+
 /**
  * enum mei_cfg_idx - indices to platform specific configurations.
  *
@@ -127,5 +139,6 @@ int mei_me_pg_exit_sync(struct mei_device *dev);
 
 irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id);
 irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id);
+int mei_me_polling_thread(void *_dev);
 
 #endif /* _MEI_INTERFACE_H_ */
-- 
cgit v1.2.3


From 9b2e03e2a102f816e5f098f7ae3ecf295855ae76 Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@intel.com>
Date: Thu, 8 Sep 2022 00:51:04 +0300
Subject: mei: gsc: wait for reset thread on stop

Wait for reset work to complete before initiating
stop reset flow sequence.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-8-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/init.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index eb052005ca86..bc054baf496c 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2012-2019, Intel Corporation. All rights reserved.
+ * Copyright (c) 2012-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -320,6 +320,8 @@ void mei_stop(struct mei_device *dev)
 
 	mei_clear_interrupts(dev);
 	mei_synchronize_irq(dev);
+	/* to catch HW-initiated reset */
+	mei_cancel_work(dev);
 
 	mutex_lock(&dev->device_lock);
 
-- 
cgit v1.2.3


From 95953618519632953402d0b26c73f89fb8a8543f Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@intel.com>
Date: Thu, 8 Sep 2022 00:51:05 +0300
Subject: mei: extend timeouts on slow devices

Parametrize operational timeouts in order
to support slow firmware on some graphics devices.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-9-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/bus-fixup.c |  5 ++---
 drivers/misc/mei/client.c    | 16 ++++++++--------
 drivers/misc/mei/gsc-me.c    |  2 +-
 drivers/misc/mei/hbm.c       | 14 +++++++-------
 drivers/misc/mei/hw-me.c     | 30 ++++++++++++++++--------------
 drivers/misc/mei/hw-me.h     |  2 +-
 drivers/misc/mei/hw-txe.c    |  4 ++--
 drivers/misc/mei/hw.h        |  7 ++++++-
 drivers/misc/mei/init.c      | 19 ++++++++++++++++++-
 drivers/misc/mei/main.c      |  4 ++--
 drivers/misc/mei/mei_dev.h   | 18 +++++++++++++++++-
 drivers/misc/mei/pci-me.c    |  4 ++--
 12 files changed, 82 insertions(+), 43 deletions(-)

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index 59506ba6fc48..344598fcf8e9 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2013-2020, Intel Corporation. All rights reserved.
+ * Copyright (c) 2013-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -164,7 +164,6 @@ static int mei_osver(struct mei_cl_device *cldev)
 			    sizeof(struct mkhi_fw_ver))
 #define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \
 			       sizeof(struct mkhi_fw_ver_block) * (__num))
-#define MKHI_RCV_TIMEOUT 500 /* receive timeout in msec */
 static int mei_fwver(struct mei_cl_device *cldev)
 {
 	char buf[MKHI_FWVER_BUF_LEN];
@@ -187,7 +186,7 @@ static int mei_fwver(struct mei_cl_device *cldev)
 
 	ret = 0;
 	bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), NULL, 0,
-				   MKHI_RCV_TIMEOUT);
+				   cldev->bus->timeouts.mkhi_recv);
 	if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) {
 		/*
 		 * Should be at least one version block,
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 31264ab2eb13..0b2fbe1335a7 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -870,7 +870,7 @@ static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb)
 	}
 
 	list_move_tail(&cb->list, &dev->ctrl_rd_list);
-	cl->timer_count = MEI_CONNECT_TIMEOUT;
+	cl->timer_count = dev->timeouts.connect;
 	mei_schedule_stall_timer(dev);
 
 	return 0;
@@ -945,7 +945,7 @@ static int __mei_cl_disconnect(struct mei_cl *cl)
 	wait_event_timeout(cl->wait,
 			   cl->state == MEI_FILE_DISCONNECT_REPLY ||
 			   cl->state == MEI_FILE_DISCONNECTED,
-			   mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+			   dev->timeouts.cl_connect);
 	mutex_lock(&dev->device_lock);
 
 	rets = cl->status;
@@ -1065,7 +1065,7 @@ static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
 	}
 
 	list_move_tail(&cb->list, &dev->ctrl_rd_list);
-	cl->timer_count = MEI_CONNECT_TIMEOUT;
+	cl->timer_count = dev->timeouts.connect;
 	mei_schedule_stall_timer(dev);
 	return 0;
 }
@@ -1164,7 +1164,7 @@ int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
 			 cl->state == MEI_FILE_DISCONNECTED ||
 			 cl->state == MEI_FILE_DISCONNECT_REQUIRED ||
 			 cl->state == MEI_FILE_DISCONNECT_REPLY),
-			mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+			dev->timeouts.cl_connect);
 	mutex_lock(&dev->device_lock);
 
 	if (!mei_cl_is_connected(cl)) {
@@ -1562,7 +1562,7 @@ int mei_cl_notify_request(struct mei_cl *cl,
 			   cl->notify_en == request ||
 			   cl->status ||
 			   !mei_cl_is_connected(cl),
-			   mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+			   dev->timeouts.cl_connect);
 	mutex_lock(&dev->device_lock);
 
 	if (cl->notify_en != request && !cl->status)
@@ -2336,7 +2336,7 @@ int mei_cl_dma_alloc_and_map(struct mei_cl *cl, const struct file *fp,
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(cl->wait,
 			   cl->dma_mapped || cl->status,
-			   mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+			   dev->timeouts.cl_connect);
 	mutex_lock(&dev->device_lock);
 
 	if (!cl->dma_mapped && !cl->status)
@@ -2415,7 +2415,7 @@ int mei_cl_dma_unmap(struct mei_cl *cl, const struct file *fp)
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(cl->wait,
 			   !cl->dma_mapped || cl->status,
-			   mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+			   dev->timeouts.cl_connect);
 	mutex_lock(&dev->device_lock);
 
 	if (cl->dma_mapped && !cl->status)
diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index 2caba3a9ac35..bfa6154b93e2 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -48,7 +48,7 @@ static int mei_gsc_probe(struct auxiliary_device *aux_dev,
 
 	device = &aux_dev->dev;
 
-	dev = mei_me_dev_init(device, cfg);
+	dev = mei_me_dev_init(device, cfg, adev->slow_firmware);
 	if (!dev) {
 		ret = -ENOMEM;
 		goto err;
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index cebcca6d6d3e..291bc0997efe 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 #include <linux/export.h>
@@ -232,7 +232,7 @@ int mei_hbm_start_wait(struct mei_device *dev)
 	mutex_unlock(&dev->device_lock);
 	ret = wait_event_timeout(dev->wait_hbm_start,
 			dev->hbm_state != MEI_HBM_STARTING,
-			mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
+			dev->timeouts.hbm);
 	mutex_lock(&dev->device_lock);
 
 	if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
@@ -275,7 +275,7 @@ int mei_hbm_start_req(struct mei_device *dev)
 	}
 
 	dev->hbm_state = MEI_HBM_STARTING;
-	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	dev->init_clients_timer = dev->timeouts.client_init;
 	mei_schedule_stall_timer(dev);
 	return 0;
 }
@@ -316,7 +316,7 @@ static int mei_hbm_dma_setup_req(struct mei_device *dev)
 	}
 
 	dev->hbm_state = MEI_HBM_DR_SETUP;
-	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	dev->init_clients_timer = dev->timeouts.client_init;
 	mei_schedule_stall_timer(dev);
 	return 0;
 }
@@ -351,7 +351,7 @@ static int mei_hbm_capabilities_req(struct mei_device *dev)
 	}
 
 	dev->hbm_state = MEI_HBM_CAP_SETUP;
-	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	dev->init_clients_timer = dev->timeouts.client_init;
 	mei_schedule_stall_timer(dev);
 	return 0;
 }
@@ -385,7 +385,7 @@ static int mei_hbm_enum_clients_req(struct mei_device *dev)
 		return ret;
 	}
 	dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
-	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	dev->init_clients_timer = dev->timeouts.client_init;
 	mei_schedule_stall_timer(dev);
 	return 0;
 }
@@ -751,7 +751,7 @@ static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
 		return ret;
 	}
 
-	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	dev->init_clients_timer = dev->timeouts.client_init;
 	mei_schedule_stall_timer(dev);
 
 	return 0;
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 1703e197ba62..b0a2f75b32ce 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -445,7 +445,7 @@ static int mei_me_hw_ready_wait(struct mei_device *dev)
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(dev->wait_hw_ready,
 			dev->recvd_hw_ready,
-			mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT));
+			dev->timeouts.hw_ready);
 	mutex_lock(&dev->device_lock);
 	if (!dev->recvd_hw_ready) {
 		dev_err(dev->dev, "wait hw ready failed\n");
@@ -707,7 +707,6 @@ static void mei_me_pg_unset(struct mei_device *dev)
 static int mei_me_pg_legacy_enter_sync(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
-	unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
 	int ret;
 
 	dev->pg_event = MEI_PG_EVENT_WAIT;
@@ -718,7 +717,8 @@ static int mei_me_pg_legacy_enter_sync(struct mei_device *dev)
 
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(dev->wait_pg,
-		dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout);
+		dev->pg_event == MEI_PG_EVENT_RECEIVED,
+		dev->timeouts.pgi);
 	mutex_lock(&dev->device_lock);
 
 	if (dev->pg_event == MEI_PG_EVENT_RECEIVED) {
@@ -744,7 +744,6 @@ static int mei_me_pg_legacy_enter_sync(struct mei_device *dev)
 static int mei_me_pg_legacy_exit_sync(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
-	unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
 	int ret;
 
 	if (dev->pg_event == MEI_PG_EVENT_RECEIVED)
@@ -756,7 +755,8 @@ static int mei_me_pg_legacy_exit_sync(struct mei_device *dev)
 
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(dev->wait_pg,
-		dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout);
+		dev->pg_event == MEI_PG_EVENT_RECEIVED,
+		dev->timeouts.pgi);
 	mutex_lock(&dev->device_lock);
 
 reply:
@@ -772,7 +772,8 @@ reply:
 
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(dev->wait_pg,
-		dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, timeout);
+		dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED,
+		dev->timeouts.pgi);
 	mutex_lock(&dev->device_lock);
 
 	if (dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED)
@@ -887,8 +888,6 @@ static u32 mei_me_d0i3_unset(struct mei_device *dev)
 static int mei_me_d0i3_enter_sync(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
-	unsigned long d0i3_timeout = mei_secs_to_jiffies(MEI_D0I3_TIMEOUT);
-	unsigned long pgi_timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
 	int ret;
 	u32 reg;
 
@@ -910,7 +909,8 @@ static int mei_me_d0i3_enter_sync(struct mei_device *dev)
 
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(dev->wait_pg,
-		dev->pg_event == MEI_PG_EVENT_RECEIVED, pgi_timeout);
+		dev->pg_event == MEI_PG_EVENT_RECEIVED,
+		dev->timeouts.pgi);
 	mutex_lock(&dev->device_lock);
 
 	if (dev->pg_event != MEI_PG_EVENT_RECEIVED) {
@@ -930,7 +930,8 @@ static int mei_me_d0i3_enter_sync(struct mei_device *dev)
 
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(dev->wait_pg,
-		dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, d0i3_timeout);
+		dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED,
+		dev->timeouts.d0i3);
 	mutex_lock(&dev->device_lock);
 
 	if (dev->pg_event != MEI_PG_EVENT_INTR_RECEIVED) {
@@ -990,7 +991,6 @@ on:
 static int mei_me_d0i3_exit_sync(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
-	unsigned long timeout = mei_secs_to_jiffies(MEI_D0I3_TIMEOUT);
 	int ret;
 	u32 reg;
 
@@ -1013,7 +1013,8 @@ static int mei_me_d0i3_exit_sync(struct mei_device *dev)
 
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(dev->wait_pg,
-		dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, timeout);
+		dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED,
+		dev->timeouts.d0i3);
 	mutex_lock(&dev->device_lock);
 
 	if (dev->pg_event != MEI_PG_EVENT_INTR_RECEIVED) {
@@ -1704,11 +1705,12 @@ EXPORT_SYMBOL_GPL(mei_me_get_cfg);
  *
  * @parent: device associated with physical device (pci/platform)
  * @cfg: per device generation config
+ * @slow_fw: configure longer timeouts as FW is slow
  *
  * Return: The mei_device pointer on success, NULL on failure.
  */
 struct mei_device *mei_me_dev_init(struct device *parent,
-				   const struct mei_cfg *cfg)
+				   const struct mei_cfg *cfg, bool slow_fw)
 {
 	struct mei_device *dev;
 	struct mei_me_hw *hw;
@@ -1723,7 +1725,7 @@ struct mei_device *mei_me_dev_init(struct device *parent,
 	for (i = 0; i < DMA_DSCR_NUM; i++)
 		dev->dr_dscr[i].size = cfg->dma_size[i];
 
-	mei_device_init(dev, parent, &mei_me_hw_ops);
+	mei_device_init(dev, parent, slow_fw, &mei_me_hw_ops);
 	hw->cfg = cfg;
 
 	dev->fw_f_fw_ver_supported = cfg->fw_ver_supported;
diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h
index 6256b36bdafd..95cf830b7c7b 100644
--- a/drivers/misc/mei/hw-me.h
+++ b/drivers/misc/mei/hw-me.h
@@ -132,7 +132,7 @@ enum mei_cfg_idx {
 const struct mei_cfg *mei_me_get_cfg(kernel_ulong_t idx);
 
 struct mei_device *mei_me_dev_init(struct device *parent,
-				   const struct mei_cfg *cfg);
+				   const struct mei_cfg *cfg, bool slow_fw);
 
 int mei_me_pg_enter_sync(struct mei_device *dev);
 int mei_me_pg_exit_sync(struct mei_device *dev);
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c
index 00652c137cc7..9862c6cd3e32 100644
--- a/drivers/misc/mei/hw-txe.c
+++ b/drivers/misc/mei/hw-txe.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2013-2020, Intel Corporation. All rights reserved.
+ * Copyright (c) 2013-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -1201,7 +1201,7 @@ struct mei_device *mei_txe_dev_init(struct pci_dev *pdev)
 	if (!dev)
 		return NULL;
 
-	mei_device_init(dev, &pdev->dev, &mei_txe_hw_ops);
+	mei_device_init(dev, &pdev->dev, false, &mei_txe_hw_ops);
 
 	hw = to_txe_hw(dev);
 
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index b46077b17114..e7e020dba6b1 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (c) 2003-2020, Intel Corporation. All rights reserved
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -16,11 +16,16 @@
 #define MEI_CONNECT_TIMEOUT         3  /* HPS: at least 2 seconds */
 
 #define MEI_CL_CONNECT_TIMEOUT     15  /* HPS: Client Connect Timeout */
+#define MEI_CL_CONNECT_TIMEOUT_SLOW 30 /* HPS: Client Connect Timeout, slow FW */
 #define MEI_CLIENTS_INIT_TIMEOUT   15  /* HPS: Clients Enumeration Timeout */
 
 #define MEI_PGI_TIMEOUT             1  /* PG Isolation time response 1 sec */
 #define MEI_D0I3_TIMEOUT            5  /* D0i3 set/unset max response time */
 #define MEI_HBM_TIMEOUT             1  /* 1 second */
+#define MEI_HBM_TIMEOUT_SLOW        5  /* 5 second, slow FW */
+
+#define MKHI_RCV_TIMEOUT 500 /* receive timeout in msec */
+#define MKHI_RCV_TIMEOUT_SLOW 10000 /* receive timeout in msec, slow FW */
 
 /*
  * FW page size for DMA allocations
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index bc054baf496c..5473b1fa6fff 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -359,14 +359,16 @@ bool mei_write_is_idle(struct mei_device *dev)
 EXPORT_SYMBOL_GPL(mei_write_is_idle);
 
 /**
- * mei_device_init  -- initialize mei_device structure
+ * mei_device_init - initialize mei_device structure
  *
  * @dev: the mei device
  * @device: the device structure
+ * @slow_fw: configure longer timeouts as FW is slow
  * @hw_ops: hw operations
  */
 void mei_device_init(struct mei_device *dev,
 		     struct device *device,
+		     bool slow_fw,
 		     const struct mei_hw_ops *hw_ops)
 {
 	/* setup our list array */
@@ -404,6 +406,21 @@ void mei_device_init(struct mei_device *dev,
 	dev->pg_event = MEI_PG_EVENT_IDLE;
 	dev->ops      = hw_ops;
 	dev->dev      = device;
+
+	dev->timeouts.hw_ready = mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT);
+	dev->timeouts.connect = MEI_CONNECT_TIMEOUT;
+	dev->timeouts.client_init = MEI_CLIENTS_INIT_TIMEOUT;
+	dev->timeouts.pgi = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
+	dev->timeouts.d0i3 = mei_secs_to_jiffies(MEI_D0I3_TIMEOUT);
+	if (slow_fw) {
+		dev->timeouts.cl_connect = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT_SLOW);
+		dev->timeouts.hbm = mei_secs_to_jiffies(MEI_HBM_TIMEOUT_SLOW);
+		dev->timeouts.mkhi_recv = msecs_to_jiffies(MKHI_RCV_TIMEOUT_SLOW);
+	} else {
+		dev->timeouts.cl_connect = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT);
+		dev->timeouts.hbm = mei_secs_to_jiffies(MEI_HBM_TIMEOUT);
+		dev->timeouts.mkhi_recv = msecs_to_jiffies(MKHI_RCV_TIMEOUT);
+	}
 }
 EXPORT_SYMBOL_GPL(mei_device_init);
 
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 786f7c8f7f61..930887e7e38d 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -571,7 +571,7 @@ static int mei_ioctl_connect_vtag(struct file *file,
 				    cl->state == MEI_FILE_DISCONNECTED ||
 				    cl->state == MEI_FILE_DISCONNECT_REQUIRED ||
 				    cl->state == MEI_FILE_DISCONNECT_REPLY),
-				   mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+				   dev->timeouts.cl_connect);
 		mutex_lock(&dev->device_lock);
 	}
 
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 694f866f87ef..babbb0944b7f 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (c) 2003-2019, Intel Corporation. All rights reserved.
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -415,6 +415,17 @@ struct mei_fw_version {
 
 #define MEI_MAX_FW_VER_BLOCKS 3
 
+struct mei_dev_timeouts {
+	unsigned long hw_ready; /* Timeout on ready message, in jiffies */
+	int connect; /* HPS: at least 2 seconds, in seconds */
+	unsigned long cl_connect; /* HPS: Client Connect Timeout, in jiffies */
+	int client_init; /* HPS: Clients Enumeration Timeout, in seconds */
+	unsigned long pgi; /* PG Isolation time response, in jiffies */
+	unsigned int d0i3; /* D0i3 set/unset max response time, in jiffies */
+	unsigned long hbm; /* HBM operation timeout, in jiffies */
+	unsigned long mkhi_recv; /* receive timeout, in jiffies */
+};
+
 /**
  * struct mei_device -  MEI private device struct
  *
@@ -480,6 +491,8 @@ struct mei_fw_version {
  * @allow_fixed_address: allow user space to connect a fixed client
  * @override_fixed_address: force allow fixed address behavior
  *
+ * @timeouts: actual timeout values
+ *
  * @reset_work  : work item for the device reset
  * @bus_rescan_work : work item for the bus rescan
  *
@@ -568,6 +581,8 @@ struct mei_device {
 	bool allow_fixed_address;
 	bool override_fixed_address;
 
+	struct mei_dev_timeouts timeouts;
+
 	struct work_struct reset_work;
 	struct work_struct bus_rescan_work;
 
@@ -632,6 +647,7 @@ static inline u32 mei_slots2data(int slots)
  */
 void mei_device_init(struct mei_device *dev,
 		     struct device *device,
+		     bool slow_fw,
 		     const struct mei_hw_ops *hw_ops);
 int mei_reset(struct mei_device *dev);
 int mei_start(struct mei_device *dev);
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 33e58821e478..47e1e1ec3d1b 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -201,7 +201,7 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 
 	/* allocates and initializes the mei dev structure */
-	dev = mei_me_dev_init(&pdev->dev, cfg);
+	dev = mei_me_dev_init(&pdev->dev, cfg, false);
 	if (!dev) {
 		err = -ENOMEM;
 		goto end;
-- 
cgit v1.2.3


From 7d88a25819ad2400aa4377c3b9fe72b66d3c5c90 Mon Sep 17 00:00:00 2001
From: Vitaly Lubart <vitaly.lubart@intel.com>
Date: Thu, 8 Sep 2022 00:51:06 +0300
Subject: mei: bus: export common mkhi definitions into a separate header

Exported common mkhi definitions from bus-fixup.c into a separate
header file mkhi.h for other driver usage.

Signed-off-by: Vitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-10-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/bus-fixup.c | 31 +------------------------------
 drivers/misc/mei/mkhi.h      | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 30 deletions(-)
 create mode 100644 drivers/misc/mei/mkhi.h

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index 344598fcf8e9..c4e527803299 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -15,6 +15,7 @@
 
 #include "mei_dev.h"
 #include "client.h"
+#include "mkhi.h"
 
 #define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
 			0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)
@@ -89,20 +90,6 @@ struct mei_os_ver {
 	u8  reserved2;
 } __packed;
 
-#define MKHI_FEATURE_PTT 0x10
-
-struct mkhi_rule_id {
-	__le16 rule_type;
-	u8 feature_id;
-	u8 reserved;
-} __packed;
-
-struct mkhi_fwcaps {
-	struct mkhi_rule_id id;
-	u8 len;
-	u8 data[];
-} __packed;
-
 struct mkhi_fw_ver_block {
 	u16 minor;
 	u8 major;
@@ -115,22 +102,6 @@ struct mkhi_fw_ver {
 	struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS];
 } __packed;
 
-#define MKHI_FWCAPS_GROUP_ID 0x3
-#define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
-#define MKHI_GEN_GROUP_ID 0xFF
-#define MKHI_GEN_GET_FW_VERSION_CMD 0x2
-struct mkhi_msg_hdr {
-	u8  group_id;
-	u8  command;
-	u8  reserved;
-	u8  result;
-} __packed;
-
-struct mkhi_msg {
-	struct mkhi_msg_hdr hdr;
-	u8 data[];
-} __packed;
-
 #define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
 			    sizeof(struct mkhi_fwcaps) + \
 			    sizeof(struct mei_os_ver))
diff --git a/drivers/misc/mei/mkhi.h b/drivers/misc/mei/mkhi.h
new file mode 100644
index 000000000000..c3fa3c5d5cb6
--- /dev/null
+++ b/drivers/misc/mei/mkhi.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ */
+
+#ifndef _MEI_MKHI_H_
+#define _MEI_MKHI_H_
+
+#include <linux/types.h>
+
+#define MKHI_FEATURE_PTT 0x10
+
+#define MKHI_FWCAPS_GROUP_ID 0x3
+#define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
+#define MKHI_GEN_GROUP_ID 0xFF
+#define MKHI_GEN_GET_FW_VERSION_CMD 0x2
+
+struct mkhi_rule_id {
+	__le16 rule_type;
+	u8 feature_id;
+	u8 reserved;
+} __packed;
+
+struct mkhi_fwcaps {
+	struct mkhi_rule_id id;
+	u8 len;
+	u8 data[];
+} __packed;
+
+struct mkhi_msg_hdr {
+	u8  group_id;
+	u8  command;
+	u8  reserved;
+	u8  result;
+} __packed;
+
+struct mkhi_msg {
+	struct mkhi_msg_hdr hdr;
+	u8 data[];
+} __packed;
+
+#endif /* _MEI_MKHI_H_ */
-- 
cgit v1.2.3


From fa313ede703115c9ebb31ce36a946aae23c14d61 Mon Sep 17 00:00:00 2001
From: Tomas Winkler <tomas.winkler@intel.com>
Date: Thu, 8 Sep 2022 00:51:07 +0300
Subject: mei: mkhi: add memory ready command

Add GSC memory ready command.
The command indicates to the firmware that extend operation
memory was setup and the firmware may enter PXP mode.

CC: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-11-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/mkhi.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/mkhi.h b/drivers/misc/mei/mkhi.h
index c3fa3c5d5cb6..1473ea489666 100644
--- a/drivers/misc/mei/mkhi.h
+++ b/drivers/misc/mei/mkhi.h
@@ -16,6 +16,13 @@
 #define MKHI_GEN_GROUP_ID 0xFF
 #define MKHI_GEN_GET_FW_VERSION_CMD 0x2
 
+#define MKHI_GROUP_ID_GFX              0x30
+#define MKHI_GFX_RESET_WARN_CMD_REQ    0x0
+#define MKHI_GFX_MEMORY_READY_CMD_REQ  0x1
+
+/* Allow transition to PXP mode without approval */
+#define MKHI_GFX_MEM_READY_PXP_ALLOWED  0x1
+
 struct mkhi_rule_id {
 	__le16 rule_type;
 	u8 feature_id;
@@ -40,4 +47,9 @@ struct mkhi_msg {
 	u8 data[];
 } __packed;
 
+struct mkhi_gfx_mem_ready {
+	struct mkhi_msg_hdr hdr;
+	u32    flags;
+} __packed;
+
 #endif /* _MEI_MKHI_H_ */
-- 
cgit v1.2.3


From 342e4c7e2d38e421f99898b629b5d82e5ae90323 Mon Sep 17 00:00:00 2001
From: Tomas Winkler <tomas.winkler@intel.com>
Date: Thu, 8 Sep 2022 00:51:08 +0300
Subject: mei: gsc: setup gsc extended operational memory

1. Retrieve extended operational memory physical pointers from the
   auxiliary device info.
2. Setup memory registers.
3. Notify firmware that the memory is ready by sending the memory
   ready command.
4. Disable PXP device if GSC is not in PXP mode.

CC: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-12-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/bus-fixup.c  | 70 +++++++++++++++++++++++++++++++++++++++++--
 drivers/misc/mei/gsc-me.c     | 16 ++++++++++
 drivers/misc/mei/hw-me-regs.h |  9 +++++-
 drivers/misc/mei/hw-me.c      | 28 ++++++++++++++++-
 drivers/misc/mei/init.c       |  2 ++
 drivers/misc/mei/mei_dev.h    | 17 +++++++++++
 6 files changed, 138 insertions(+), 4 deletions(-)

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index c4e527803299..79305e4acce2 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -188,6 +188,19 @@ static int mei_fwver(struct mei_cl_device *cldev)
 	return ret;
 }
 
+static int mei_gfx_memory_ready(struct mei_cl_device *cldev)
+{
+	struct mkhi_gfx_mem_ready req = {0};
+	unsigned int mode = MEI_CL_IO_TX_INTERNAL;
+
+	req.hdr.group_id = MKHI_GROUP_ID_GFX;
+	req.hdr.command = MKHI_GFX_MEMORY_READY_CMD_REQ;
+	req.flags = MKHI_GFX_MEM_READY_PXP_ALLOWED;
+
+	dev_dbg(&cldev->dev, "Sending memory ready command\n");
+	return __mei_cl_send(cldev->cl, (u8 *)&req, sizeof(req), 0, mode);
+}
+
 static void mei_mkhi_fix(struct mei_cl_device *cldev)
 {
 	int ret;
@@ -234,6 +247,39 @@ static void mei_gsc_mkhi_ver(struct mei_cl_device *cldev)
 		dev_err(&cldev->dev, "FW version command failed %d\n", ret);
 	mei_cldev_disable(cldev);
 }
+
+static void mei_gsc_mkhi_fix_ver(struct mei_cl_device *cldev)
+{
+	int ret;
+
+	/* No need to enable the client if nothing is needed from it */
+	if (!cldev->bus->fw_f_fw_ver_supported &&
+	    cldev->bus->pxp_mode != MEI_DEV_PXP_INIT)
+		return;
+
+	ret = mei_cldev_enable(cldev);
+	if (ret)
+		return;
+
+	if (cldev->bus->pxp_mode == MEI_DEV_PXP_INIT) {
+		ret = mei_gfx_memory_ready(cldev);
+		if (ret < 0)
+			dev_err(&cldev->dev, "memory ready command failed %d\n", ret);
+		else
+			dev_dbg(&cldev->dev, "memory ready command sent\n");
+		/* we go to reset after that */
+		cldev->bus->pxp_mode = MEI_DEV_PXP_SETUP;
+		goto out;
+	}
+
+	ret = mei_fwver(cldev);
+	if (ret < 0)
+		dev_err(&cldev->dev, "FW version command failed %d\n",
+			ret);
+out:
+	mei_cldev_disable(cldev);
+}
+
 /**
  * mei_wd - wd client on the bus, change protocol version
  *   as the API has changed.
@@ -473,6 +519,26 @@ static void vt_support(struct mei_cl_device *cldev)
 		cldev->do_match = 1;
 }
 
+/**
+ * pxp_is_ready - enable bus client if pxp is ready
+ *
+ * @cldev: me clients device
+ */
+static void pxp_is_ready(struct mei_cl_device *cldev)
+{
+	struct mei_device *bus = cldev->bus;
+
+	switch (bus->pxp_mode) {
+	case MEI_DEV_PXP_READY:
+	case MEI_DEV_PXP_DEFAULT:
+		cldev->do_match = 1;
+	break;
+	default:
+		cldev->do_match = 0;
+	break;
+	}
+}
+
 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
 
 static struct mei_fixup {
@@ -486,10 +552,10 @@ static struct mei_fixup {
 	MEI_FIXUP(MEI_UUID_WD, mei_wd),
 	MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
 	MEI_FIXUP(MEI_UUID_IGSC_MKHI, mei_gsc_mkhi_ver),
-	MEI_FIXUP(MEI_UUID_IGSC_MKHI_FIX, mei_gsc_mkhi_ver),
+	MEI_FIXUP(MEI_UUID_IGSC_MKHI_FIX, mei_gsc_mkhi_fix_ver),
 	MEI_FIXUP(MEI_UUID_HDCP, whitelist),
 	MEI_FIXUP(MEI_UUID_ANY, vt_support),
-	MEI_FIXUP(MEI_UUID_PAVP, whitelist),
+	MEI_FIXUP(MEI_UUID_PAVP, pxp_is_ready),
 };
 
 /**
diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index bfa6154b93e2..6b22726aed55 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -32,6 +32,17 @@ static int mei_gsc_read_hfs(const struct mei_device *dev, int where, u32 *val)
 	return 0;
 }
 
+static void mei_gsc_set_ext_op_mem(const struct mei_me_hw *hw, struct resource *mem)
+{
+	u32 low = lower_32_bits(mem->start);
+	u32 hi  = upper_32_bits(mem->start);
+	u32 limit = (resource_size(mem) / SZ_4K) | GSC_EXT_OP_MEM_VALID;
+
+	iowrite32(low, hw->mem_addr + H_GSC_EXT_OP_MEM_BASE_ADDR_LO_REG);
+	iowrite32(hi, hw->mem_addr + H_GSC_EXT_OP_MEM_BASE_ADDR_HI_REG);
+	iowrite32(limit, hw->mem_addr + H_GSC_EXT_OP_MEM_LIMIT_REG);
+}
+
 static int mei_gsc_probe(struct auxiliary_device *aux_dev,
 			 const struct auxiliary_device_id *aux_dev_id)
 {
@@ -67,6 +78,11 @@ static int mei_gsc_probe(struct auxiliary_device *aux_dev,
 
 	dev_set_drvdata(device, dev);
 
+	if (adev->ext_op_mem.start) {
+		mei_gsc_set_ext_op_mem(hw, &adev->ext_op_mem);
+		dev->pxp_mode = MEI_DEV_PXP_INIT;
+	}
+
 	/* use polling */
 	if (mei_me_hw_use_polling(hw)) {
 		mei_disable_interrupts(dev);
diff --git a/drivers/misc/mei/hw-me-regs.h b/drivers/misc/mei/hw-me-regs.h
index 64ce3f830262..4d5e8af5745b 100644
--- a/drivers/misc/mei/hw-me-regs.h
+++ b/drivers/misc/mei/hw-me-regs.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (c) 2003-2019, Intel Corporation. All rights reserved.
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 #ifndef _MEI_HW_MEI_REGS_H_
@@ -125,6 +125,8 @@
 #  define PCI_CFG_HFS_3_FW_SKU_SPS   0x00000060
 #define PCI_CFG_HFS_4         0x64
 #define PCI_CFG_HFS_5         0x68
+#  define GSC_CFG_HFS_5_BOOT_TYPE_MSK      0x00000003
+#  define GSC_CFG_HFS_5_BOOT_TYPE_PXP               3
 #define PCI_CFG_HFS_6         0x6C
 
 /* MEI registers */
@@ -141,6 +143,11 @@
 /* H_D0I3C - D0I3 Control  */
 #define H_D0I3C    0x800
 
+#define H_GSC_EXT_OP_MEM_BASE_ADDR_LO_REG 0x100
+#define H_GSC_EXT_OP_MEM_BASE_ADDR_HI_REG 0x104
+#define H_GSC_EXT_OP_MEM_LIMIT_REG        0x108
+#define GSC_EXT_OP_MEM_VALID              BIT(31)
+
 /* register bits of H_CSR (Host Control Status register) */
 /* Host Circular Buffer Depth - maximum number of 32-bit entries in CB */
 #define H_CBD             0xFF000000
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index b0a2f75b32ce..bb317cd4f0f3 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -433,6 +433,29 @@ static bool mei_me_hw_is_resetting(struct mei_device *dev)
 	return (mecsr & ME_RST_HRA) == ME_RST_HRA;
 }
 
+/**
+ * mei_gsc_pxp_check - check for gsc firmware entering pxp mode
+ *
+ * @dev: the device structure
+ */
+static void mei_gsc_pxp_check(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 fwsts5 = 0;
+
+	if (dev->pxp_mode == MEI_DEV_PXP_DEFAULT)
+		return;
+
+	hw->read_fws(dev, PCI_CFG_HFS_5, &fwsts5);
+	trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HFS_5", PCI_CFG_HFS_5, fwsts5);
+	if ((fwsts5 & GSC_CFG_HFS_5_BOOT_TYPE_MSK) == GSC_CFG_HFS_5_BOOT_TYPE_PXP) {
+		dev_dbg(dev->dev, "pxp mode is ready 0x%08x\n", fwsts5);
+		dev->pxp_mode = MEI_DEV_PXP_READY;
+	} else {
+		dev_dbg(dev->dev, "pxp mode is not ready 0x%08x\n", fwsts5);
+	}
+}
+
 /**
  * mei_me_hw_ready_wait - wait until the me(hw) has turned ready
  *  or timeout is reached
@@ -452,6 +475,8 @@ static int mei_me_hw_ready_wait(struct mei_device *dev)
 		return -ETIME;
 	}
 
+	mei_gsc_pxp_check(dev);
+
 	mei_me_hw_reset_release(dev);
 	dev->recvd_hw_ready = false;
 	return 0;
@@ -1268,7 +1293,8 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
 
 	/* check if ME wants a reset */
 	if (!mei_hw_is_ready(dev) && dev->dev_state != MEI_DEV_RESETTING) {
-		dev_warn(dev->dev, "FW not ready: resetting.\n");
+		dev_warn(dev->dev, "FW not ready: resetting: dev_state = %d pxp = %d\n",
+			 dev->dev_state, dev->pxp_mode);
 		if (dev->dev_state == MEI_DEV_POWERING_DOWN ||
 		    dev->dev_state == MEI_DEV_POWER_DOWN)
 			mei_cl_all_disconnect(dev);
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 5473b1fa6fff..1b4d5d7870b9 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -397,6 +397,8 @@ void mei_device_init(struct mei_device *dev,
 	bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
 	dev->open_handle_count = 0;
 
+	dev->pxp_mode = MEI_DEV_PXP_DEFAULT;
+
 	/*
 	 * Reserving the first client ID
 	 * 0: Reserved for MEI Bus Message communications
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index babbb0944b7f..6bb3e1ba9ded 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -62,6 +62,21 @@ enum mei_dev_state {
 	MEI_DEV_POWER_UP
 };
 
+/**
+ * enum mei_dev_pxp_mode - MEI PXP mode state
+ *
+ * @MEI_DEV_PXP_DEFAULT: PCH based device, no initailization required
+ * @MEI_DEV_PXP_INIT:    device requires initialization, send setup message to firmware
+ * @MEI_DEV_PXP_SETUP:   device is in setup stage, waiting for firmware repsonse
+ * @MEI_DEV_PXP_READY:   device initialized
+ */
+enum mei_dev_pxp_mode {
+	MEI_DEV_PXP_DEFAULT = 0,
+	MEI_DEV_PXP_INIT    = 1,
+	MEI_DEV_PXP_SETUP   = 2,
+	MEI_DEV_PXP_READY   = 3,
+};
+
 const char *mei_dev_state_str(int state);
 
 enum mei_file_transaction_states {
@@ -454,6 +469,7 @@ struct mei_dev_timeouts {
  * @reset_count : number of consecutive resets
  * @dev_state   : device state
  * @hbm_state   : state of host bus message protocol
+ * @pxp_mode    : PXP device mode
  * @init_clients_timer : HBM init handshake timeout
  *
  * @pg_event    : power gating event
@@ -537,6 +553,7 @@ struct mei_device {
 	unsigned long reset_count;
 	enum mei_dev_state dev_state;
 	enum mei_hbm_state hbm_state;
+	enum mei_dev_pxp_mode pxp_mode;
 	u16 init_clients_timer;
 
 	/*
-- 
cgit v1.2.3


From bc9abe0ef1bdd47b6770f4c6e6ac7ca68a7d8997 Mon Sep 17 00:00:00 2001
From: Vitaly Lubart <vitaly.lubart@intel.com>
Date: Thu, 8 Sep 2022 00:51:09 +0300
Subject: mei: gsc: add transition to PXP mode in resume flow

Added transition to PXP mode in resume flow.

CC: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Vitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-13-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/gsc-me.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index 6b22726aed55..75765e4df4ed 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -182,11 +182,22 @@ static int __maybe_unused mei_gsc_pm_suspend(struct device *device)
 static int __maybe_unused mei_gsc_pm_resume(struct device *device)
 {
 	struct mei_device *dev = dev_get_drvdata(device);
+	struct auxiliary_device *aux_dev;
+	struct mei_aux_device *adev;
 	int err;
+	struct mei_me_hw *hw;
 
 	if (!dev)
 		return -ENODEV;
 
+	hw = to_me_hw(dev);
+	aux_dev = to_auxiliary_dev(device);
+	adev = auxiliary_dev_to_mei_aux_dev(aux_dev);
+	if (adev->ext_op_mem.start) {
+		mei_gsc_set_ext_op_mem(hw, &adev->ext_op_mem);
+		dev->pxp_mode = MEI_DEV_PXP_INIT;
+	}
+
 	err = mei_restart(dev);
 	if (err)
 		return err;
-- 
cgit v1.2.3


From 267cb87001651ffbb8501be3fe970f32d5858afe Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@intel.com>
Date: Thu, 8 Sep 2022 00:51:10 +0300
Subject: mei: drop ready bits check after start

The check that hardware and host ready bits are set after start
is redundant and may fail and disable driver if there is
back-to-back link reset issued right after start.
This happens during pxp mode transitions when firmware
undergo reset. Remove these checks to eliminate such failures.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-14-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/init.c | 10 ----------
 1 file changed, 10 deletions(-)

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 1b4d5d7870b9..bac8852aad51 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -218,16 +218,6 @@ int mei_start(struct mei_device *dev)
 		goto err;
 	}
 
-	if (!mei_host_is_ready(dev)) {
-		dev_err(dev->dev, "host is not ready.\n");
-		goto err;
-	}
-
-	if (!mei_hw_is_ready(dev)) {
-		dev_err(dev->dev, "ME is not ready.\n");
-		goto err;
-	}
-
 	if (!mei_hbm_version_is_supported(dev)) {
 		dev_dbg(dev->dev, "MEI start failed.\n");
 		goto err;
-- 
cgit v1.2.3


From 57e4f15506262dbd431c5f72ebd5b21ebb426119 Mon Sep 17 00:00:00 2001
From: Tomas Winkler <tomas.winkler@intel.com>
Date: Thu, 8 Sep 2022 00:51:11 +0300
Subject: mei: debugfs: add pxp mode to devstate in debugfs

Add pxp mode devstate to debugfs to monitor pxp state machine progress.
This is useful to debug issues in scenarios in which the pxp state
needs to be re-initialized, like during power transitions such as
suspend/resume. With this debugfs the state could be monitored
to ensure that pxp is in the ready state.

CC: Vitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-15-tomas.winkler@intel.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/misc/mei/debugfs.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

(limited to 'drivers/misc')

diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index 1ce61e9e24fc..3b098d4c8e3d 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (c) 2012-2016, Intel Corporation. All rights reserved
+ * Copyright (c) 2012-2022, Intel Corporation. All rights reserved
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
@@ -86,6 +86,20 @@ out:
 }
 DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_active);
 
+static const char *mei_dev_pxp_mode_str(enum mei_dev_pxp_mode state)
+{
+#define MEI_PXP_MODE(state) case MEI_DEV_PXP_##state: return #state
+	switch (state) {
+	MEI_PXP_MODE(DEFAULT);
+	MEI_PXP_MODE(INIT);
+	MEI_PXP_MODE(SETUP);
+	MEI_PXP_MODE(READY);
+	default:
+		return "unknown";
+	}
+#undef MEI_PXP_MODE
+}
+
 static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused)
 {
 	struct mei_device *dev = m->private;
@@ -112,6 +126,9 @@ static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused)
 	seq_printf(m, "pg:  %s, %s\n",
 		   mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
 		   mei_pg_state_str(mei_pg_state(dev)));
+
+	seq_printf(m, "pxp: %s\n", mei_dev_pxp_mode_str(dev->pxp_mode));
+
 	return 0;
 }
 DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_devstate);
-- 
cgit v1.2.3