Merge tag 'char-misc-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc updates from Greg KH:
 "Here is the big set of char/misc driver patches for 4.17-rc1.

  There are a lot of little things in here, nothing huge, but all
  important to the different hardware types involved:

   -  thunderbolt driver updates

   -  parport updates (people still care...)

   -  nvmem driver updates

   -  mei updates (as always)

   -  hwtracing driver updates

   -  hyperv driver updates

   -  extcon driver updates

   -  ... and a handful of even smaller driver subsystem and individual
      driver updates

  All of these have been in linux-next with no reported issues"

* tag 'char-misc-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (149 commits)
  hwtracing: Add HW tracing support menu
  intel_th: Add ACPI glue layer
  intel_th: Allow forcing host mode through drvdata
  intel_th: Pick up irq number from resources
  intel_th: Don't touch switch routing in host mode
  intel_th: Use correct method of finding hub
  intel_th: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate
  stm class: Make dummy's master/channel ranges configurable
  stm class: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate
  MAINTAINERS: Bestow upon myself the care for drivers/hwtracing
  hv: add SPDX license id to Kconfig
  hv: add SPDX license to trace
  Drivers: hv: vmbus: do not mark HV_PCIE as perf_device
  Drivers: hv: vmbus: respect what we get from hv_get_synint_state()
  /dev/mem: Avoid overwriting "err" in read_mem()
  eeprom: at24: use SPDX identifier instead of GPL boiler-plate
  eeprom: at24: simplify the i2c functionality checking
  eeprom: at24: fix a line break
  eeprom: at24: tweak newlines
  eeprom: at24: refactor at24_probe()
  ...

Documentation/ABI/stable/sysfs-bus-vmbus

@@ -132,3 +132,10 @@ KernelVersion:	4.16
 Contact:	Stephen Hemminger <sthemmin@microsoft.com>
 Description:	Monitor bit associated with channel
 Users:		Debugging tools and userspace drivers
+
+What:		/sys/bus/vmbus/devices/vmbus_*/channels/NN/ring
+Date:		January. 2018
+KernelVersion:	4.16
+Contact:	Stephen Hemminger <sthemmin@microsoft.com>
+Description:	Binary file created by uio_hv_generic for ring buffer
+Users:		Userspace drivers

Documentation/ABI/testing/sysfs-bus-thunderbolt

+What: /sys/bus/thunderbolt/devices/.../domainX/boot_acl
+Date:		Jun 2018
+KernelVersion:	4.17
+Contact:	thunderbolt-software@lists.01.org
+Description:	Holds a comma separated list of device unique_ids that
+		are allowed to be connected automatically during system
+		startup (e.g boot devices). The list always contains
+		maximum supported number of unique_ids where unused
+		entries are empty. This allows the userspace software
+		to determine how many entries the controller supports.
+		If there are multiple controllers, each controller has
+		its own ACL list and size may be different between the
+		controllers.
+
+		System BIOS may have an option "Preboot ACL" or similar
+		that needs to be selected before this list is taken into
+		consideration.
+
+		Software always updates a full list in each write.
+
+		If a device is authorized automatically during boot its
+		boot attribute is set to 1.
+
 What: /sys/bus/thunderbolt/devices/.../domainX/security
 Date:		Sep 2017
 KernelVersion:	4.13
@@ -12,6 +35,9 @@ Description:	This attribute holds current Thunderbolt security level
 			minimum. User needs to authorize each device.
 		dponly: Automatically tunnel Display port (and USB). No
 			PCIe tunnels are created.
+		usbonly: Automatically tunnel USB controller of the
+			 connected Thunderbolt dock (and Display Port). All
+			 PCIe links downstream of the dock are removed.
 
 What: /sys/bus/thunderbolt/devices/.../authorized
 Date:		Sep 2017
@@ -38,6 +64,13 @@ Description:	This attribute is used to authorize Thunderbolt devices
 		   the device did not contain a key at all, and
 		   EKEYREJECTED if the challenge response did not match.
 
+What: /sys/bus/thunderbolt/devices/.../boot
+Date:		Jun 2018
+KernelVersion:	4.17
+Contact:	thunderbolt-software@lists.01.org
+Description:	This attribute contains 1 if Thunderbolt device was already
+		authorized on boot and 0 otherwise.
+
 What: /sys/bus/thunderbolt/devices/.../key
 Date:		Sep 2017
 KernelVersion:	4.13

Documentation/ABI/testing/sysfs-class-mei

@@ -45,3 +45,12 @@ Contact:	Tomas Winkler <tomas.winkler@intel.com>
 Description:	Display the driver HBM protocol version.
 
 		The HBM protocol version supported by the driver.
+
+What:		/sys/class/mei/meiN/tx_queue_limit
+Date:		Jan 2018
+KernelVersion:	4.16
+Contact:	Tomas Winkler <tomas.winkler@intel.com>
+Description:	Configure tx queue limit
+
+		Set maximal number of pending writes
+		per opened session.

Documentation/ABI/testing/sysfs-driver-fsi-master-gpio

+What:           /sys/bus/platform/devices/[..]/fsi-master-gpio/external_mode
+Date:           Feb 2018
+KernelVersion:  4.17
+Contact:        jk@ozlabs.org
+Description:
+                Controls access arbitration for GPIO-based FSI master. A
+		value of 0 (the default) sets normal mode, where the
+		driver performs FSI bus transactions, 1 sets external mode,
+		where the FSI bus is driven externally (for example, by
+		a debug device).

Documentation/admin-guide/thunderbolt.rst

@@ -21,11 +21,11 @@ vulnerable to DMA attacks.
 Security levels and how to use them
 -----------------------------------
 Starting with Intel Falcon Ridge Thunderbolt controller there are 4
-security levels available. The reason for these is the fact that the
-connected devices can be DMA masters and thus read contents of the host
-memory without CPU and OS knowing about it. There are ways to prevent
-this by setting up an IOMMU but it is not always available for various
-reasons.
+security levels available. Intel Titan Ridge added one more security level
+(usbonly). The reason for these is the fact that the connected devices can
+be DMA masters and thus read contents of the host memory without CPU and OS
+knowing about it. There are ways to prevent this by setting up an IOMMU but
+it is not always available for various reasons.
 
 The security levels are as follows:
 
@@ -52,6 +52,11 @@ The security levels are as follows:
     USB. No PCIe tunneling is done. In BIOS settings this is
     typically called *Display Port Only*.
 
+  usbonly
+    The firmware automatically creates tunnels for the USB controller and
+    Display Port in a dock. All PCIe links downstream of the dock are
+    removed.
+
 The current security level can be read from
 ``/sys/bus/thunderbolt/devices/domainX/security`` where ``domainX`` is
 the Thunderbolt domain the host controller manages. There is typically

Documentation/devicetree/bindings/connector/samsung,usb-connector-11pin.txt

+Samsung micro-USB 11-pin connector
+==================================
+
+Samsung micro-USB 11-pin connector is an extension of micro-USB connector.
+It is present in multiple Samsung mobile devices.
+It has additional pins to route MHL traffic simultanously with USB.
+
+The bindings are superset of usb-connector bindings for micro-USB connector[1].
+
+Required properties:
+- compatible: must be: "samsung,usb-connector-11pin", "usb-b-connector",
+- type: must be "micro".
+
+Required nodes:
+- any data bus to the connector should be modeled using the OF graph bindings
+  specified in bindings/graph.txt, unless the bus is between parent node and
+  the connector. Since single connector can have multpile data buses every bus
+  has assigned OF graph port number as follows:
+    0: High Speed (HS),
+    3: Mobile High-Definition Link (MHL), specific to 11-pin Samsung micro-USB.
+
+[1]: bindings/connector/usb-connector.txt
+
+Example
+-------
+
+Micro-USB connector with HS lines routed via controller (MUIC) and MHL lines
+connected to HDMI-MHL bridge (sii8620):
+
+muic-max77843@66 {
+	...
+	usb_con: connector {
+		compatible = "samsung,usb-connector-11pin", "usb-b-connector";
+		label = "micro-USB";
+		type = "micro";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@3 {
+				reg = <3>;
+				usb_con_mhl: endpoint {
+					remote-endpoint = <&sii8620_mhl>;
+				};
+			};
+		};
+	};
+};

Documentation/devicetree/bindings/connector/usb-connector.txt

+USB Connector
+=============
+
+USB connector node represents physical USB connector. It should be
+a child of USB interface controller.
+
+Required properties:
+- compatible: describes type of the connector, must be one of:
+    "usb-a-connector",
+    "usb-b-connector",
+    "usb-c-connector".
+
+Optional properties:
+- label: symbolic name for the connector,
+- type: size of the connector, should be specified in case of USB-A, USB-B
+  non-fullsize connectors: "mini", "micro".
+
+Required nodes:
+- any data bus to the connector should be modeled using the OF graph bindings
+  specified in bindings/graph.txt, unless the bus is between parent node and
+  the connector. Since single connector can have multpile data buses every bus
+  has assigned OF graph port number as follows:
+    0: High Speed (HS), present in all connectors,
+    1: Super Speed (SS), present in SS capable connectors,
+    2: Sideband use (SBU), present in USB-C.
+
+Examples
+--------
+
+1. Micro-USB connector with HS lines routed via controller (MUIC):
+
+muic-max77843@66 {
+	...
+	usb_con: connector {
+		compatible = "usb-b-connector";
+		label = "micro-USB";
+		type = "micro";
+	};
+};
+
+2. USB-C connector attached to CC controller (s2mm005), HS lines routed
+to companion PMIC (max77865), SS lines to USB3 PHY and SBU to DisplayPort.
+DisplayPort video lines are routed to the connector via SS mux in USB3 PHY.
+
+ccic: s2mm005@33 {
+	...
+	usb_con: connector {
+		compatible = "usb-c-connector";
+		label = "USB-C";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				usb_con_hs: endpoint {
+					remote-endpoint = <&max77865_usbc_hs>;
+				};
+			};
+			port@1 {
+				reg = <1>;
+				usb_con_ss: endpoint {
+					remote-endpoint = <&usbdrd_phy_ss>;
+				};
+			};
+			port@2 {
+				reg = <2>;
+				usb_con_sbu: endpoint {
+					remote-endpoint = <&dp_aux>;
+				};
+			};
+		};
+	};
+};

Documentation/devicetree/bindings/fsi/fsi.txt

+FSI bus & engine generic device tree bindings
+=============================================
+
+The FSI bus is probe-able, so the OS is able to enumerate FSI slaves, and
+engines within those slaves. However, we have a facility to match devicetree
+nodes to probed engines. This allows for fsi engines to expose non-probeable
+busses, which are then exposed by the device tree. For example, an FSI engine
+that is an I2C master - the I2C bus can be described by the device tree under
+the engine's device tree node.
+
+FSI masters may require their own DT nodes (to describe the master HW itself);
+that requirement is defined by the master's implementation, and is described by
+the fsi-master-* binding specifications.
+
+Under the masters' nodes, we can describe the bus topology using nodes to
+represent the FSI slaves and their slave engines. As a basic outline:
+
+  fsi-master {
+      /* top-level of FSI bus topology, bound to an FSI master driver and
+       * exposes an FSI bus */
+
+      fsi-slave@<link,id> {
+          /* this node defines the FSI slave device, and is handled
+           * entirely with FSI core code */
+
+          fsi-slave-engine@<addr> {
+              /* this node defines the engine endpoint & address range, which
+               * is bound to the relevant fsi device driver */
+               ...
+          };
+
+          fsi-slave-engine@<addr> {
+              ...
+          };
+
+      };
+  };
+
+Note that since the bus is probe-able, some (or all) of the topology may
+not be described; this binding only provides an optional facility for
+adding subordinate device tree nodes as children of FSI engines.
+
+FSI masters
+-----------
+
+FSI master nodes declare themselves as such with the "fsi-master" compatible
+value. It's likely that an implementation-specific compatible value will
+be needed as well, for example:
+
+    compatible = "fsi-master-gpio", "fsi-master";
+
+Since the master nodes describe the top-level of the FSI topology, they also
+need to declare the FSI-standard addressing scheme. This requires two cells for
+addresses (link index and slave ID), and no size:
+
+    #address-cells = <2>;
+    #size-cells = <0>;
+
+An optional boolean property can be added to indicate that a particular master
+should not scan for connected devices at initialization time.  This is
+necessary in cases where a scan could cause arbitration issues with other
+masters that may be present on the bus.
+
+    no-scan-on-init;
+
+FSI slaves
+----------
+
+Slaves are identified by a (link-index, slave-id) pair, so require two cells
+for an address identifier. Since these are not a range, no size cells are
+required. For an example, a slave on link 1, with ID 2, could be represented
+as:
+
+    cfam@1,2 {
+        reg = <1 2>;
+	[...];
+    }
+
+Each slave provides an address-space, under which the engines are accessible.
+That address space has a maximum of 23 bits, so we use one cell to represent
+addresses and sizes in the slave address space:
+
+    #address-cells = <1>;
+    #size-cells = <1>;
+
+
+FSI engines (devices)
+---------------------
+
+Engines are identified by their address under the slaves' address spaces. We
+use a single cell for address and size. Engine nodes represent the endpoint
+FSI device, and are passed to those FSI device drivers' ->probe() functions.
+
+For example, for a slave using a single 0x400-byte page starting at address
+0xc00:
+
+    engine@c00 {
+        reg = <0xc00 0x400>;
+    };
+
+
+Full example
+------------
+
+Here's an example that illustrates:
+ - an FSI master
+   - connected to an FSI slave
+     - that contains an engine that is an I2C master
+       - connected to an I2C EEPROM
+
+The FSI master may be connected to additional slaves, and slaves may have
+additional engines, but they don't necessarily need to be describe in the
+device tree if no extra platform information is required.
+
+    /* The GPIO-based FSI master node, describing the top level of the
+     * FSI bus
+     */
+    gpio-fsi {
+        compatible = "fsi-master-gpio", "fsi-master";
+        #address-cells = <2>;
+        #size-cells = <0>;
+
+        /* A FSI slave (aka. CFAM) at link 0, ID 0. */
+        cfam@0,0 {
+            reg = <0 0>;
+            #address-cells = <1>;
+            #size-cells = <1>;
+
+            /* FSI engine at 0xc00, using a single page. In this example,
+             * it's an I2C master controller, so subnodes describe the
+             * I2C bus.
+             */
+            i2c-controller@c00 {
+                reg = <0xc00 0x400>;
+
+                /* Engine-specific data. In this case, we're describing an
+                 * I2C bus, so we're conforming to the generic I2C binding
+                 */
+                compatible = "some-vendor,fsi-i2c-controller";
+                #address-cells = <1>;
+                #size-cells = <1>;
+
+                /* I2C endpoint device: an Atmel EEPROM */
+                eeprom@50 {
+                    compatible = "atmel,24c256";
+                    reg = <0x50>;
+                    pagesize = <64>;
+                };
+            };
+        };
+    };

Documentation/devicetree/bindings/mfd/aspeed-lpc.txt

@@ -109,9 +109,50 @@ lpc: lpc@1e789000 {
 	};
 };
 
+BMC Node Children
+==================
+
+
 Host Node Children
 ==================
 
+LPC Host Interface Controller
+-------------------
+
+The LPC Host Interface Controller manages functions exposed to the host such as
+LPC firmware hub cycles, configuration of the LPC-to-AHB mapping, UART
+management and bus snoop configuration.
+
+Required properties:
+
+- compatible:	One of:
+		"aspeed,ast2400-lpc-ctrl";
+		"aspeed,ast2500-lpc-ctrl";
+
+- reg:		contains offset/length values of the host interface controller
+		memory regions
+
+- clocks:	contains a phandle to the syscon node describing the clocks.
+		There should then be one cell representing the clock to use
+
+- memory-region: A phandle to a reserved_memory region to be used for the LPC
+		to AHB mapping
+
+- flash:	A phandle to the SPI flash controller containing the flash to
+		be exposed over the LPC to AHB mapping
+
+Example:
+
+lpc-host@80 {
+	lpc_ctrl: lpc-ctrl@0 {
+		compatible = "aspeed,ast2500-lpc-ctrl";
+		reg = <0x0 0x80>;
+		clocks = <&syscon ASPEED_CLK_GATE_LCLK>;
+		memory-region = <&flash_memory>;
+		flash = <&spi>;
+	};
+};
+
 LPC Host Controller
 -------------------
 

Documentation/devicetree/bindings/nvmem/imx-ocotp.txt

@@ -11,17 +11,32 @@ Required properties:
 	"fsl,imx6ul-ocotp" (i.MX6UL),
 	"fsl,imx7d-ocotp" (i.MX7D/S),
 	followed by "syscon".
+- #address-cells : Should be 1
+- #size-cells : Should be 1
 - reg: Should contain the register base and length.
 - clocks: Should contain a phandle pointing to the gated peripheral clock.
 
 Optional properties:
 - read-only: disable write access
 
-Example:
+Optional Child nodes:
+
+- Data cells of ocotp:
+  Detailed bindings are described in bindings/nvmem/nvmem.txt
 
+Example:
 	ocotp: ocotp@21bc000 {
-		compatible = "fsl,imx6q-ocotp", "syscon";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "fsl,imx6sx-ocotp", "syscon";
 		reg = <0x021bc000 0x4000>;
-		clocks = <&clks IMX6QDL_CLK_IIM>;
-		read-only;
+		clocks = <&clks IMX6SX_CLK_OCOTP>;
+
+		tempmon_calib: calib@38 {
+			reg = <0x38 4>;
+		};
+
+		tempmon_temp_grade: temp-grade@20 {
+			reg = <0x20 4>;
+		};
 	};

Documentation/devicetree/bindings/nvmem/snvs-lpgpr.txt

 Device tree bindings for Low Power General Purpose Register found in i.MX6Q/D
-Secure Non-Volatile Storage.
+and i.MX7 Secure Non-Volatile Storage.
 
 This DT node should be represented as a sub-node of a "syscon",
 "simple-mfd" node.
@@ -8,6 +8,7 @@ Required properties:
 - compatible: should be one of the fallowing variants:
 	"fsl,imx6q-snvs-lpgpr" for Freescale i.MX6Q/D/DL/S
 	"fsl,imx6ul-snvs-lpgpr" for Freescale i.MX6UL
+	"fsl,imx7d-snvs-lpgpr" for Freescale i.MX7D/S
 
 Example:
 snvs: snvs@020cc000 {

Documentation/driver-api/uio-howto.rst

@@ -709,6 +709,11 @@ The vmbus device regions are mapped into uio device resources:
     3) Network receive buffer region
     4) Network send buffer region
 
+If a subchannel is created by a request to host, then the uio_hv_generic
+device driver will create a sysfs binary file for the per-channel ring buffer.
+For example:
+	/sys/bus/vmbus/devices/3811fe4d-0fa0-4b62-981a-74fc1084c757/channels/21/ring
+
 Further information
 ===================
 

MAINTAINERS

@@ -6212,6 +6212,11 @@ F:	Documentation/hw_random.txt
 F:	drivers/char/hw_random/
 F:	include/linux/hw_random.h
 
+HARDWARE TRACING FACILITIES
+M:	Alexander Shishkin <alexander.shishkin@linux.intel.com>
+S:	Maintained
+F:	drivers/hwtracing/
+
 HARDWARE SPINLOCK CORE
 M:	Ohad Ben-Cohen <ohad@wizery.com>
 M:	Bjorn Andersson <bjorn.andersson@linaro.org>
@@ -8140,7 +8145,7 @@ F:	drivers/*/*/*pasemi*
 LINUX KERNEL DUMP TEST MODULE (LKDTM)
 M:	Kees Cook <keescook@chromium.org>
 S:	Maintained
-F:	drivers/misc/lkdtm*
+F:	drivers/misc/lkdtm/*
 
 LINUX KERNEL MEMORY CONSISTENCY MODEL (LKMM)
 M:	Alan Stern <stern@rowland.harvard.edu>

arch/x86/entry/entry_32.S

@@ -902,6 +902,9 @@ BUILD_INTERRUPT3(hyperv_callback_vector, HYPERVISOR_CALLBACK_VECTOR,
 BUILD_INTERRUPT3(hyperv_reenlightenment_vector, HYPERV_REENLIGHTENMENT_VECTOR,
 		 hyperv_reenlightenment_intr)
 
+BUILD_INTERRUPT3(hv_stimer0_callback_vector, HYPERV_STIMER0_VECTOR,
+		 hv_stimer0_vector_handler)
+
 #endif /* CONFIG_HYPERV */
 
 ENTRY(page_fault)

arch/x86/entry/entry_64.S

@@ -1140,6 +1140,9 @@ apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \
 
 apicinterrupt3 HYPERV_REENLIGHTENMENT_VECTOR \
 	hyperv_reenlightenment_vector hyperv_reenlightenment_intr
+
+apicinterrupt3 HYPERV_STIMER0_VECTOR \
+	hv_stimer0_callback_vector hv_stimer0_vector_handler
 #endif /* CONFIG_HYPERV */
 
 idtentry debug			do_debug		has_error_code=0	paranoid=1 shift_ist=DEBUG_STACK

arch/x86/include/asm/hardirq.h

@@ -40,6 +40,7 @@ typedef struct {
 #endif
 #if IS_ENABLED(CONFIG_HYPERV)
 	unsigned int irq_hv_reenlightenment_count;
+	unsigned int hyperv_stimer0_count;
 #endif
 } ____cacheline_aligned irq_cpustat_t;
 

arch/x86/include/asm/irq_vectors.h

@@ -106,9 +106,10 @@
 
 #if IS_ENABLED(CONFIG_HYPERV)
 #define HYPERV_REENLIGHTENMENT_VECTOR	0xee
+#define HYPERV_STIMER0_VECTOR		0xed
 #endif
 
-#define LOCAL_TIMER_VECTOR		0xed
+#define LOCAL_TIMER_VECTOR		0xec
 
 #define NR_VECTORS			 256
 

arch/x86/include/asm/mshyperv.h

@@ -173,6 +173,19 @@ void hv_remove_kexec_handler(void);
 void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
 void hv_remove_crash_handler(void);
 
+/*
+ * Routines for stimer0 Direct Mode handling.
+ * On x86/x64, there are no percpu actions to take.
+ */
+void hv_stimer0_vector_handler(struct pt_regs *regs);
+void hv_stimer0_callback_vector(void);
+int hv_setup_stimer0_irq(int *irq, int *vector, void (*handler)(void));
+void hv_remove_stimer0_irq(int irq);
+
+static inline void hv_enable_stimer0_percpu_irq(int irq) {}
+static inline void hv_disable_stimer0_percpu_irq(int irq) {}
+
+
 #if IS_ENABLED(CONFIG_HYPERV)
 extern struct clocksource *hyperv_cs;
 extern void *hv_hypercall_pg;

arch/x86/include/uapi/asm/hyperv.h

@@ -77,6 +77,9 @@
 /* Crash MSR available */
 #define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE (1 << 10)
 
+/* stimer Direct Mode is available */
+#define HV_X64_STIMER_DIRECT_MODE_AVAILABLE	(1 << 19)
+
 /*
  * Feature identification: EBX indicates which flags were specified at
  * partition creation. The format is the same as the partition creation

arch/x86/kernel/cpu/mshyperv.c

@@ -37,6 +37,7 @@ EXPORT_SYMBOL_GPL(ms_hyperv);
 
 #if IS_ENABLED(CONFIG_HYPERV)
 static void (*vmbus_handler)(void);
+static void (*hv_stimer0_handler)(void);
 static void (*hv_kexec_handler)(void);
 static void (*hv_crash_handler)(struct pt_regs *regs);
 
@@ -69,6 +70,41 @@ void hv_remove_vmbus_irq(void)
 EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq);
 EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq);
 
+/*
+ * Routines to do per-architecture handling of stimer0
+ * interrupts when in Direct Mode
+ */
+
+__visible void __irq_entry hv_stimer0_vector_handler(struct pt_regs *regs)
+{
+	struct pt_regs *old_regs = set_irq_regs(regs);
+
+	entering_irq();
+	inc_irq_stat(hyperv_stimer0_count);
+	if (hv_stimer0_handler)
+		hv_stimer0_handler();
+	ack_APIC_irq();
+
+	exiting_irq();
+	set_irq_regs(old_regs);
+}
+
+int hv_setup_stimer0_irq(int *irq, int *vector, void (*handler)(void))
+{
+	*vector = HYPERV_STIMER0_VECTOR;
+	*irq = 0;   /* Unused on x86/x64 */
+	hv_stimer0_handler = handler;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hv_setup_stimer0_irq);
+
+void hv_remove_stimer0_irq(int irq)
+{
+	/* We have no way to deallocate the interrupt gate */
+	hv_stimer0_handler = NULL;
+}
+EXPORT_SYMBOL_GPL(hv_remove_stimer0_irq);
+
 void hv_setup_kexec_handler(void (*handler)(void))
 {
 	hv_kexec_handler = handler;
@@ -257,6 +293,10 @@ static void __init ms_hyperv_init_platform(void)
 		alloc_intr_gate(HYPERV_REENLIGHTENMENT_VECTOR,
 				hyperv_reenlightenment_vector);
 
+	/* Setup the IDT for stimer0 */
+	if (ms_hyperv.misc_features & HV_X64_STIMER_DIRECT_MODE_AVAILABLE)
+		alloc_intr_gate(HYPERV_STIMER0_VECTOR,
+				hv_stimer0_callback_vector);
 #endif
 }
 

arch/x86/kernel/irq.c

@@ -150,6 +150,13 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 				   irq_stats(j)->irq_hv_reenlightenment_count);
 		seq_puts(p, "  Hyper-V reenlightenment interrupts\n");
 	}
+	if (test_bit(HYPERV_STIMER0_VECTOR, system_vectors)) {
+		seq_printf(p, "%*s: ", prec, "HVS");
+		for_each_online_cpu(j)
+			seq_printf(p, "%10u ",
+				   irq_stats(j)->hyperv_stimer0_count);
+		seq_puts(p, "  Hyper-V stimer0 interrupts\n");
+	}
 #endif
 	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 #if defined(CONFIG_X86_IO_APIC)

block/genhd.c

@@ -308,19 +308,22 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
 /**
  * register_blkdev - register a new block device
  *
- * @major: the requested major device number [1..255]. If @major = 0, try to
- *         allocate any unused major number.
+ * @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If
+ *         @major = 0, try to allocate any unused major number.
  * @name: the name of the new block device as a zero terminated string
  *
  * The @name must be unique within the system.
  *
  * The return value depends on the @major input parameter:
  *
- *  - if a major device number was requested in range [1..255] then the
- *    function returns zero on success, or a negative error code
+ *  - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1]
+ *    then the function returns zero on success, or a negative error code
  *  - if any unused major number was requested with @major = 0 parameter
  *    then the return value is the allocated major number in range
- *    [1..255] or a negative error code otherwise
+ *    [1..BLKDEV_MAJOR_MAX-1] or a negative error code otherwise
+ *
+ * See Documentation/admin-guide/devices.txt for the list of allocated
+ * major numbers.
  */
 int register_blkdev(unsigned int major, const char *name)
 {
@@ -347,8 +350,8 @@ int register_blkdev(unsigned int major, const char *name)
 	}
 
 	if (major >= BLKDEV_MAJOR_MAX) {
-		pr_err("register_blkdev: major requested (%d) is greater than the maximum (%d) for %s\n",
-		       major, BLKDEV_MAJOR_MAX, name);
+		pr_err("register_blkdev: major requested (%u) is greater than the maximum (%u) for %s\n",
+		       major, BLKDEV_MAJOR_MAX-1, name);
 
 		ret = -EINVAL;
 		goto out;
@@ -375,7 +378,7 @@ int register_blkdev(unsigned int major, const char *name)
 		ret = -EBUSY;
 
 	if (ret < 0) {
-		printk("register_blkdev: cannot get major %d for %s\n",
+		printk("register_blkdev: cannot get major %u for %s\n",
 		       major, name);
 		kfree(p);
 	}

drivers/Kconfig

@@ -199,9 +199,7 @@ source "drivers/dax/Kconfig"
 
 source "drivers/nvmem/Kconfig"
 
-source "drivers/hwtracing/stm/Kconfig"
-
-source "drivers/hwtracing/intel_th/Kconfig"
+source "drivers/hwtracing/Kconfig"
 
 source "drivers/fpga/Kconfig"
 

drivers/char/Kconfig

@@ -236,7 +236,7 @@ source "drivers/char/hw_random/Kconfig"
 
 config NVRAM
 	tristate "/dev/nvram support"
-	depends on ATARI || X86 || (ARM && RTC_DRV_CMOS) || GENERIC_NVRAM
+	depends on ATARI || X86 || GENERIC_NVRAM
 	---help---
 	  If you say Y here and create a character special file /dev/nvram
 	  with major number 10 and minor number 144 using mknod ("man mknod"),

drivers/char/mem.c

@@ -137,7 +137,7 @@ static ssize_t read_mem(struct file *file, char __user *buf,
 
 	while (count > 0) {
 		unsigned long remaining;
-		int allowed;
+		int allowed, probe;
 
 		sz = size_inside_page(p, count);
 
@@ -160,9 +160,9 @@ static ssize_t read_mem(struct file *file, char __user *buf,
 			if (!ptr)
 				goto failed;
 
-			err = probe_kernel_read(bounce, ptr, sz);
+			probe = probe_kernel_read(bounce, ptr, sz);
 			unxlate_dev_mem_ptr(p, ptr);
-			if (err)
+			if (probe)
 				goto failed;
 
 			remaining = copy_to_user(buf, bounce, sz);

drivers/char/xillybus/xillybus_pcie.c

@@ -24,7 +24,6 @@ MODULE_LICENSE("GPL v2");
 
 #define PCI_DEVICE_ID_XILLYBUS		0xebeb
 
-#define PCI_VENDOR_ID_ALTERA		0x1172
 #define PCI_VENDOR_ID_ACTEL		0x11aa
 #define PCI_VENDOR_ID_LATTICE		0x1204
 

drivers/extcon/extcon-gpio.c

@@ -18,8 +18,6 @@
  */
 
 #include <linux/extcon-provider.h>
-#include <linux/extcon/extcon-gpio.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -29,14 +27,30 @@
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 
+/**
+ * struct gpio_extcon_data - A simple GPIO-controlled extcon device state container.
+ * @edev:		Extcon device.
+ * @irq:		Interrupt line for the external connector.
+ * @work:		Work fired by the interrupt.
+ * @debounce_jiffies:	Number of jiffies to wait for the GPIO to stabilize, from the debounce
+ *			value.
+ * @gpiod:		GPIO descriptor for this external connector.
+ * @extcon_id:		The unique id of specific external connector.
+ * @debounce:		Debounce time for GPIO IRQ in ms.
+ * @irq_flags:		IRQ Flags (e.g., IRQF_TRIGGER_LOW).
+ * @check_on_resume:	Boolean describing whether to check the state of gpio
+ *			while resuming from sleep.
+ */
 struct gpio_extcon_data {
 	struct extcon_dev *edev;
 	int irq;
 	struct delayed_work work;
 	unsigned long debounce_jiffies;
-
-	struct gpio_desc *id_gpiod;
-	struct gpio_extcon_pdata *pdata;
+	struct gpio_desc *gpiod;
+	unsigned int extcon_id;
+	unsigned long debounce;
+	unsigned long irq_flags;
+	bool check_on_resume;
 };
 
 static void gpio_extcon_work(struct work_struct *work)
@@ -46,11 +60,8 @@ static void gpio_extcon_work(struct work_struct *work)
 		container_of(to_delayed_work(work), struct gpio_extcon_data,
 			     work);
 
-	state = gpiod_get_value_cansleep(data->id_gpiod);
-	if (data->pdata->gpio_active_low)
-		state = !state;
-
-	extcon_set_state_sync(data->edev, data->pdata->extcon_id, state);
+	state = gpiod_get_value_cansleep(data->gpiod);
+	extcon_set_state_sync(data->edev, data->extcon_id, state);
 }
 
 static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
@@ -62,65 +73,41 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
-{
-	struct gpio_extcon_pdata *pdata = data->pdata;
-	int ret;
-
-	ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN,
-				dev_name(dev));
-	if (ret < 0)
-		return ret;
-
-	data->id_gpiod = gpio_to_desc(pdata->gpio);
-	if (!data->id_gpiod)
-		return -EINVAL;
-
-	if (pdata->debounce) {
-		ret = gpiod_set_debounce(data->id_gpiod,
-					pdata->debounce * 1000);
-		if (ret < 0)
-			data->debounce_jiffies =
-				msecs_to_jiffies(pdata->debounce);
-	}
-
-	data->irq = gpiod_to_irq(data->id_gpiod);
-	if (data->irq < 0)
-		return data->irq;
-
-	return 0;
-}
-
 static int gpio_extcon_probe(struct platform_device *pdev)
 {
-	struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev);
 	struct gpio_extcon_data *data;
+	struct device *dev = &pdev->dev;
 	int ret;
 
-	if (!pdata)
-		return -EBUSY;
-	if (!pdata->irq_flags || pdata->extcon_id > EXTCON_NONE)
-		return -EINVAL;
-
-	data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
-				   GFP_KERNEL);
+	data = devm_kzalloc(dev, sizeof(struct gpio_extcon_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
-	data->pdata = pdata;
 
-	/* Initialize the gpio */
-	ret = gpio_extcon_init(&pdev->dev, data);
-	if (ret < 0)
-		return ret;
+	/*
+	 * FIXME: extcon_id represents the unique identifier of external
+	 * connectors such as EXTCON_USB, EXTCON_DISP_HDMI and so on. extcon_id
+	 * is necessary to register the extcon device. But, it's not yet
+	 * developed to get the extcon id from device-tree or others.
+	 * On later, it have to be solved.
+	 */
+	if (!data->irq_flags || data->extcon_id > EXTCON_NONE)
+		return -EINVAL;
+
+	data->gpiod = devm_gpiod_get(dev, "extcon", GPIOD_IN);
+	if (IS_ERR(data->gpiod))
+		return PTR_ERR(data->gpiod);
+	data->irq = gpiod_to_irq(data->gpiod);
+	if (data->irq <= 0)
+		return data->irq;
 
 	/* Allocate the memory of extcon devie and register extcon device */
-	data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id);
+	data->edev = devm_extcon_dev_allocate(dev, &data->extcon_id);
 	if (IS_ERR(data->edev)) {
-		dev_err(&pdev->dev, "failed to allocate extcon device\n");
+		dev_err(dev, "failed to allocate extcon device\n");
 		return -ENOMEM;
 	}
 
-	ret = devm_extcon_dev_register(&pdev->dev, data->edev);
+	ret = devm_extcon_dev_register(dev, data->edev);
 	if (ret < 0)
 		return ret;
 
@@ -130,8 +117,8 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 	 * Request the interrupt of gpio to detect whether external connector
 	 * is attached or detached.
 	 */
-	ret = devm_request_any_context_irq(&pdev->dev, data->irq,
-					gpio_irq_handler, pdata->irq_flags,
+	ret = devm_request_any_context_irq(dev, data->irq,
+					gpio_irq_handler, data->irq_flags,
 					pdev->name, data);
 	if (ret < 0)
 		return ret;
@@ -158,7 +145,7 @@ static int gpio_extcon_resume(struct device *dev)
 	struct gpio_extcon_data *data;
 
 	data = dev_get_drvdata(dev);
-	if (data->pdata->check_on_resume)
+	if (data->check_on_resume)
 		queue_delayed_work(system_power_efficient_wq,
 			&data->work, data->debounce_jiffies);
 

drivers/extcon/extcon-intel-cht-wc.c

@@ -66,6 +66,8 @@
 
 #define CHT_WC_VBUS_GPIO_CTLO		0x6e2d
 #define CHT_WC_VBUS_GPIO_CTLO_OUTPUT	BIT(0)
+#define CHT_WC_VBUS_GPIO_CTLO_DRV_OD	BIT(4)
+#define CHT_WC_VBUS_GPIO_CTLO_DIR_OUT	BIT(5)
 
 enum cht_wc_usb_id {
 	USB_ID_OTG,
@@ -183,14 +185,15 @@ static void cht_wc_extcon_set_5v_boost(struct cht_wc_extcon_data *ext,
 {
 	int ret, val;
 
-	val = enable ? CHT_WC_VBUS_GPIO_CTLO_OUTPUT : 0;
-
 	/*
 	 * The 5V boost converter is enabled through a gpio on the PMIC, since
 	 * there currently is no gpio driver we access the gpio reg directly.
 	 */
-	ret = regmap_update_bits(ext->regmap, CHT_WC_VBUS_GPIO_CTLO,
-				 CHT_WC_VBUS_GPIO_CTLO_OUTPUT, val);
+	val = CHT_WC_VBUS_GPIO_CTLO_DRV_OD | CHT_WC_VBUS_GPIO_CTLO_DIR_OUT;
+	if (enable)
+		val |= CHT_WC_VBUS_GPIO_CTLO_OUTPUT;
+
+	ret = regmap_write(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, val);
 	if (ret)
 		dev_err(ext->dev, "Error writing Vbus GPIO CTLO: %d\n", ret);
 }

drivers/extcon/extcon-intel-int3496.c

@@ -50,7 +50,11 @@ static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, fal
 static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false };
 
 static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = {
-	{ "id-gpios", &id_gpios, 1 },
+	/*
+	 * Some platforms have a bug in ACPI GPIO description making IRQ
+	 * GPIO to be output only. Ask the GPIO core to ignore this limit.
+	 */
+	{ "id-gpios", &id_gpios, 1, ACPI_GPIO_QUIRK_NO_IO_RESTRICTION },
 	{ "vbus-gpios", &vbus_gpios, 1 },
 	{ "mux-gpios", &mux_gpios, 1 },
 	{ },
@@ -112,9 +116,6 @@ static int int3496_probe(struct platform_device *pdev)
 		ret = PTR_ERR(data->gpio_usb_id);
 		dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
 		return ret;
-	} else if (gpiod_get_direction(data->gpio_usb_id) != GPIOF_DIR_IN) {
-		dev_warn(dev, FW_BUG "USB ID GPIO not in input mode, fixing\n");
-		gpiod_direction_input(data->gpio_usb_id);
 	}
 
 	data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);

drivers/extcon/extcon.c

@@ -1336,6 +1336,28 @@ void extcon_dev_unregister(struct extcon_dev *edev)
 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
 
 #ifdef CONFIG_OF
+
+/*
+ * extcon_find_edev_by_node - Find the extcon device from devicetree.
+ * @node	: OF node identifying edev
+ *
+ * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
+ */
+struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
+{
+	struct extcon_dev *edev;
+
+	mutex_lock(&extcon_dev_list_lock);
+	list_for_each_entry(edev, &extcon_dev_list, entry)
+		if (edev->dev.parent && edev->dev.parent->of_node == node)
+			goto out;
+	edev = ERR_PTR(-EPROBE_DEFER);
+out:
+	mutex_unlock(&extcon_dev_list_lock);
+
+	return edev;
+}
+
 /*
  * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
  * @dev		: the instance to the given device
@@ -1363,25 +1385,27 @@ struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
 		return ERR_PTR(-ENODEV);
 	}
 
-	mutex_lock(&extcon_dev_list_lock);
-	list_for_each_entry(edev, &extcon_dev_list, entry) {
-		if (edev->dev.parent && edev->dev.parent->of_node == node) {
-			mutex_unlock(&extcon_dev_list_lock);
-			of_node_put(node);
-			return edev;
-		}
-	}
-	mutex_unlock(&extcon_dev_list_lock);
+	edev = extcon_find_edev_by_node(node);
 	of_node_put(node);
 
-	return ERR_PTR(-EPROBE_DEFER);
+	return edev;
 }
+
 #else
+
+struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
 {
 	return ERR_PTR(-ENOSYS);
 }
+
 #endif /* CONFIG_OF */
+
+EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
 
 /**

drivers/fpga/altera-cvp.c

@@ -384,8 +384,6 @@ static int altera_cvp_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *dev_id);
 static void altera_cvp_remove(struct pci_dev *pdev);
 
-#define PCI_VENDOR_ID_ALTERA	0x1172
-
 static struct pci_device_id altera_cvp_id_tbl[] = {
 	{ PCI_VDEVICE(ALTERA, PCI_ANY_ID) },
 	{ }

drivers/fsi/Kconfig

@@ -4,6 +4,7 @@
 
 menuconfig FSI
 	tristate "FSI support"
+	depends on OF
 	select CRC4
 	---help---
 	  FSI - the FRU Support Interface - is a simple bus for low-level

drivers/fsi/fsi-core.c

@@ -18,6 +18,7 @@
 #include <linux/fsi.h>
 #include <linux/idr.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
 
@@ -142,6 +143,7 @@ static void fsi_device_release(struct device *_device)
 {
 	struct fsi_device *device = to_fsi_dev(_device);
 
+	of_node_put(device->dev.of_node);
 	kfree(device);
 }
 
@@ -205,7 +207,7 @@ static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave)
 	if (rc)
 		return rc;
 
-	dev_info(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n",
+	dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n",
 			be32_to_cpu(stat), be32_to_cpu(irq));
 
 	/* clear interrupts */
@@ -334,6 +336,57 @@ extern void fsi_slave_release_range(struct fsi_slave *slave,
 }
 EXPORT_SYMBOL_GPL(fsi_slave_release_range);
 
+static bool fsi_device_node_matches(struct device *dev, struct device_node *np,
+		uint32_t addr, uint32_t size)
+{
+	unsigned int len, na, ns;
+	const __be32 *prop;
+	uint32_t psize;
+
+	na = of_n_addr_cells(np);
+	ns = of_n_size_cells(np);
+
+	if (na != 1 || ns != 1)
+		return false;
+
+	prop = of_get_property(np, "reg", &len);
+	if (!prop || len != 8)
+		return false;
+
+	if (of_read_number(prop, 1) != addr)
+		return false;
+
+	psize = of_read_number(prop + 1, 1);
+	if (psize != size) {
+		dev_warn(dev,
+			"node %s matches probed address, but not size (got 0x%x, expected 0x%x)",
+			of_node_full_name(np), psize, size);
+	}
+
+	return true;
+}
+
+/* Find a matching node for the slave engine at @address, using @size bytes
+ * of space. Returns NULL if not found, or a matching node with refcount
+ * already incremented.
+ */
+static struct device_node *fsi_device_find_of_node(struct fsi_device *dev)
+{
+	struct device_node *parent, *np;
+
+	parent = dev_of_node(&dev->slave->dev);
+	if (!parent)
+		return NULL;
+
+	for_each_child_of_node(parent, np) {
+		if (fsi_device_node_matches(&dev->dev, np,
+					dev->addr, dev->size))
+			return np;
+	}
+
+	return NULL;
+}
+
 static int fsi_slave_scan(struct fsi_slave *slave)
 {
 	uint32_t engine_addr;
@@ -402,6 +455,7 @@ static int fsi_slave_scan(struct fsi_slave *slave)
 			dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x",
 					slave->master->idx, slave->link,
 					slave->id, i - 2);
+			dev->dev.of_node = fsi_device_find_of_node(dev);
 
 			rc = device_register(&dev->dev);
 			if (rc) {
@@ -558,9 +612,53 @@ static void fsi_slave_release(struct device *dev)
 {
 	struct fsi_slave *slave = to_fsi_slave(dev);
 
+	of_node_put(dev->of_node);
 	kfree(slave);
 }
 
+static bool fsi_slave_node_matches(struct device_node *np,
+		int link, uint8_t id)
+{
+	unsigned int len, na, ns;
+	const __be32 *prop;
+
+	na = of_n_addr_cells(np);
+	ns = of_n_size_cells(np);
+
+	/* Ensure we have the correct format for addresses and sizes in
+	 * reg properties
+	 */
+	if (na != 2 || ns != 0)
+		return false;
+
+	prop = of_get_property(np, "reg", &len);
+	if (!prop || len != 8)
+		return false;
+
+	return (of_read_number(prop, 1) == link) &&
+		(of_read_number(prop + 1, 1) == id);
+}
+
+/* Find a matching node for the slave at (link, id). Returns NULL if none
+ * found, or a matching node with refcount already incremented.
+ */
+static struct device_node *fsi_slave_find_of_node(struct fsi_master *master,
+		int link, uint8_t id)
+{
+	struct device_node *parent, *np;
+
+	parent = dev_of_node(&master->dev);
+	if (!parent)
+		return NULL;
+
+	for_each_child_of_node(parent, np) {
+		if (fsi_slave_node_matches(np, link, id))
+			return np;
+	}
+
+	return NULL;
+}
+
 static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 {
 	uint32_t chip_id, llmode;
@@ -589,7 +687,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 		return -EIO;
 	}
 
-	dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n",
+	dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n",
 			chip_id, master->idx, link, id);
 
 	rc = fsi_slave_set_smode(master, link, id);
@@ -623,6 +721,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 
 	slave->master = master;
 	slave->dev.parent = &master->dev;
+	slave->dev.of_node = fsi_slave_find_of_node(master, link, id);
 	slave->dev.release = fsi_slave_release;
 	slave->link = link;
 	slave->id = id;
@@ -656,10 +755,13 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 /* FSI master support */
 static int fsi_check_access(uint32_t addr, size_t size)
 {
-	if (size != 1 && size != 2 && size != 4)
-		return -EINVAL;
-
-	if ((addr & 0x3) != (size & 0x3))
+	if (size == 4) {
+		if (addr & 0x3)
+			return -EINVAL;
+	} else if (size == 2) {
+		if (addr & 0x1)
+			return -EINVAL;
+	} else if (size != 1)
 		return -EINVAL;
 
 	return 0;
@@ -762,14 +864,20 @@ static void fsi_master_unscan(struct fsi_master *master)
 	device_for_each_child(&master->dev, NULL, fsi_master_remove_slave);
 }
 
+int fsi_master_rescan(struct fsi_master *master)
+{
+	fsi_master_unscan(master);
+	return fsi_master_scan(master);
+}
+EXPORT_SYMBOL_GPL(fsi_master_rescan);
+
 static ssize_t master_rescan_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct fsi_master *master = to_fsi_master(dev);
 	int rc;
 
-	fsi_master_unscan(master);
-	rc = fsi_master_scan(master);
+	rc = fsi_master_rescan(master);
 	if (rc < 0)
 		return rc;
 
@@ -793,6 +901,7 @@ static DEVICE_ATTR(break, 0200, NULL, master_break_store);
 int fsi_master_register(struct fsi_master *master)
 {
 	int rc;
+	struct device_node *np;
 
 	if (!master)
 		return -EINVAL;
@@ -820,7 +929,9 @@ int fsi_master_register(struct fsi_master *master)
 		return rc;
 	}
 
-	fsi_master_scan(master);
+	np = dev_of_node(&master->dev);
+	if (!of_property_read_bool(np, "no-scan-on-init"))
+		fsi_master_scan(master);
 
 	return 0;
 }

drivers/fsi/fsi-master-gpio.c

@@ -9,6 +9,7 @@
 #include <linux/gpio/consumer.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -59,6 +60,7 @@ struct fsi_master_gpio {
 	struct gpio_desc	*gpio_trans;	/* Voltage translator */
 	struct gpio_desc	*gpio_enable;	/* FSI enable */
 	struct gpio_desc	*gpio_mux;	/* Mux control */
+	bool			external_mode;
 };
 
 #define CREATE_TRACE_POINTS
@@ -411,6 +413,12 @@ static int fsi_master_gpio_xfer(struct fsi_master_gpio *master, uint8_t slave,
 	int rc;
 
 	spin_lock_irqsave(&master->cmd_lock, flags);
+
+	if (master->external_mode) {
+		spin_unlock_irqrestore(&master->cmd_lock, flags);
+		return -EBUSY;
+	}
+
 	serial_out(master, cmd);
 	echo_delay(master);
 	rc = poll_for_response(master, slave, resp_len, resp);
@@ -461,12 +469,18 @@ static int fsi_master_gpio_term(struct fsi_master *_master,
 static int fsi_master_gpio_break(struct fsi_master *_master, int link)
 {
 	struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
+	unsigned long flags;
 
 	if (link != 0)
 		return -ENODEV;
 
 	trace_fsi_master_gpio_break(master);
 
+	spin_lock_irqsave(&master->cmd_lock, flags);
+	if (master->external_mode) {
+		spin_unlock_irqrestore(&master->cmd_lock, flags);
+		return -EBUSY;
+	}
 	set_sda_output(master, 1);
 	sda_out(master, 1);
 	clock_toggle(master, FSI_PRE_BREAK_CLOCKS);
@@ -475,6 +489,7 @@ static int fsi_master_gpio_break(struct fsi_master *_master, int link)
 	echo_delay(master);
 	sda_out(master, 1);
 	clock_toggle(master, FSI_POST_BREAK_CLOCKS);
+	spin_unlock_irqrestore(&master->cmd_lock, flags);
 
 	/* Wait for logic reset to take effect */
 	udelay(200);
@@ -494,21 +509,84 @@ static void fsi_master_gpio_init(struct fsi_master_gpio *master)
 	clock_zeros(master, FSI_INIT_CLOCKS);
 }
 
+static void fsi_master_gpio_init_external(struct fsi_master_gpio *master)
+{
+	gpiod_direction_output(master->gpio_mux, 0);
+	gpiod_direction_output(master->gpio_trans, 0);
+	gpiod_direction_output(master->gpio_enable, 1);
+	gpiod_direction_input(master->gpio_clk);
+	gpiod_direction_input(master->gpio_data);
+}
+
 static int fsi_master_gpio_link_enable(struct fsi_master *_master, int link)
 {
 	struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
+	unsigned long flags;
+	int rc = -EBUSY;
 
 	if (link != 0)
 		return -ENODEV;
-	gpiod_set_value(master->gpio_enable, 1);
 
-	return 0;
+	spin_lock_irqsave(&master->cmd_lock, flags);
+	if (!master->external_mode) {
+		gpiod_set_value(master->gpio_enable, 1);
+		rc = 0;
+	}
+	spin_unlock_irqrestore(&master->cmd_lock, flags);
+
+	return rc;
+}
+
+static ssize_t external_mode_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct fsi_master_gpio *master = dev_get_drvdata(dev);
+
+	return snprintf(buf, PAGE_SIZE - 1, "%u\n",
+			master->external_mode ? 1 : 0);
 }
 
+static ssize_t external_mode_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct fsi_master_gpio *master = dev_get_drvdata(dev);
+	unsigned long flags, val;
+	bool external_mode;
+	int err;
+
+	err = kstrtoul(buf, 0, &val);
+	if (err)
+		return err;
+
+	external_mode = !!val;
+
+	spin_lock_irqsave(&master->cmd_lock, flags);
+
+	if (external_mode == master->external_mode) {
+		spin_unlock_irqrestore(&master->cmd_lock, flags);
+		return count;
+	}
+
+	master->external_mode = external_mode;
+	if (master->external_mode)
+		fsi_master_gpio_init_external(master);
+	else
+		fsi_master_gpio_init(master);
+	spin_unlock_irqrestore(&master->cmd_lock, flags);
+
+	fsi_master_rescan(&master->master);
+
+	return count;
+}
+
+static DEVICE_ATTR(external_mode, 0664,
+		external_mode_show, external_mode_store);
+
 static int fsi_master_gpio_probe(struct platform_device *pdev)
 {
 	struct fsi_master_gpio *master;
 	struct gpio_desc *gpio;
+	int rc;
 
 	master = devm_kzalloc(&pdev->dev, sizeof(*master), GFP_KERNEL);
 	if (!master)
@@ -516,6 +594,7 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
 
 	master->dev = &pdev->dev;
 	master->master.dev.parent = master->dev;
+	master->master.dev.of_node = of_node_get(dev_of_node(master->dev));
 
 	gpio = devm_gpiod_get(&pdev->dev, "clock", 0);
 	if (IS_ERR(gpio)) {
@@ -565,6 +644,10 @@ static int fsi_master_gpio_probe(struct platform_device *pdev)
 
 	fsi_master_gpio_init(master);
 
+	rc = device_create_file(&pdev->dev, &dev_attr_external_mode);
+	if (rc)
+		return rc;
+
 	return fsi_master_register(&master->master);
 }
 
@@ -583,6 +666,8 @@ static int fsi_master_gpio_remove(struct platform_device *pdev)
 		devm_gpiod_put(&pdev->dev, master->gpio_mux);
 	fsi_master_unregister(&master->master);
 
+	of_node_put(master->master.dev.of_node);
+
 	return 0;
 }
 

drivers/fsi/fsi-master-hub.c

@@ -16,6 +16,7 @@
 #include <linux/delay.h>
 #include <linux/fsi.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 
 #include "fsi-master.h"
@@ -253,7 +254,7 @@ static int hub_master_probe(struct device *dev)
 
 	reg = be32_to_cpu(__reg);
 	links = (reg >> 8) & 0xff;
-	dev_info(dev, "hub version %08x (%d links)\n", reg, links);
+	dev_dbg(dev, "hub version %08x (%d links)\n", reg, links);
 
 	rc = fsi_slave_claim_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET,
 			FSI_HUB_LINK_SIZE * links);
@@ -274,6 +275,7 @@ static int hub_master_probe(struct device *dev)
 
 	hub->master.dev.parent = dev;
 	hub->master.dev.release = hub_master_release;
+	hub->master.dev.of_node = of_node_get(dev_of_node(dev));
 
 	hub->master.n_links = links;
 	hub->master.read = hub_master_read;
@@ -286,10 +288,19 @@ static int hub_master_probe(struct device *dev)
 	hub_master_init(hub);
 
 	rc = fsi_master_register(&hub->master);
-	if (!rc)
-		return 0;
+	if (rc)
+		goto err_release;
+
+	/* At this point, fsi_master_register performs the device_initialize(),
+	 * and holds the sole reference on master.dev. This means the device
+	 * will be freed (via ->release) during any subsequent call to
+	 * fsi_master_unregister.  We add our own reference to it here, so we
+	 * can perform cleanup (in _remove()) without it being freed before
+	 * we're ready.
+	 */
+	get_device(&hub->master.dev);
+	return 0;
 
-	kfree(hub);
 err_release:
 	fsi_slave_release_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET,
 			FSI_HUB_LINK_SIZE * links);
@@ -302,6 +313,14 @@ static int hub_master_remove(struct device *dev)
 
 	fsi_master_unregister(&hub->master);
 	fsi_slave_release_range(hub->upstream->slave, hub->addr, hub->size);
+	of_node_put(hub->master.dev.of_node);
+
+	/*
+	 * master.dev will likely be ->release()ed after this, which free()s
+	 * the hub
+	 */
+	put_device(&hub->master.dev);
+
 	return 0;
 }
 

drivers/fsi/fsi-master.h

@@ -37,7 +37,24 @@ struct fsi_master {
 
 #define dev_to_fsi_master(d) container_of(d, struct fsi_master, dev)
 
+/**
+ * fsi_master registration & lifetime: the fsi_master_register() and
+ * fsi_master_unregister() functions will take ownership of the master, and
+ * ->dev in particular. The registration path performs a get_device(), which
+ * takes the first reference on the device. Similarly, the unregistration path
+ * performs a put_device(), which may well drop the last reference.
+ *
+ * This means that master implementations *may* need to hold their own
+ * reference (via get_device()) on master->dev. In particular, if the device's
+ * ->release callback frees the fsi_master, then fsi_master_unregister will
+ * invoke this free if no other reference is held.
+ *
+ * The same applies for the error path of fsi_master_register; if the call
+ * fails, dev->release will have been invoked.
+ */
 extern int fsi_master_register(struct fsi_master *master);
 extern void fsi_master_unregister(struct fsi_master *master);
 
+extern int fsi_master_rescan(struct fsi_master *master);
+
 #endif /* DRIVERS_FSI_MASTER_H */

drivers/gpu/drm/bridge/sil-sii8620.c

@@ -17,6 +17,7 @@
 
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/extcon.h>
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
@@ -25,6 +26,7 @@
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/of_graph.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 
@@ -81,6 +83,10 @@ struct sii8620 {
 	struct edid *edid;
 	unsigned int gen2_write_burst:1;
 	enum sii8620_mt_state mt_state;
+	struct extcon_dev *extcon;
+	struct notifier_block extcon_nb;
+	struct work_struct extcon_wq;
+	int cable_state;
 	struct list_head mt_queue;
 	struct {
 		int r_size;
@@ -2170,6 +2176,77 @@ static void sii8620_init_rcp_input_dev(struct sii8620 *ctx)
 	ctx->rc_dev = rc_dev;
 }
 
+static void sii8620_cable_out(struct sii8620 *ctx)
+{
+	disable_irq(to_i2c_client(ctx->dev)->irq);
+	sii8620_hw_off(ctx);
+}
+
+static void sii8620_extcon_work(struct work_struct *work)
+{
+	struct sii8620 *ctx =
+		container_of(work, struct sii8620, extcon_wq);
+	int state = extcon_get_state(ctx->extcon, EXTCON_DISP_MHL);
+
+	if (state == ctx->cable_state)
+		return;
+
+	ctx->cable_state = state;
+
+	if (state > 0)
+		sii8620_cable_in(ctx);
+	else
+		sii8620_cable_out(ctx);
+}
+
+static int sii8620_extcon_notifier(struct notifier_block *self,
+			unsigned long event, void *ptr)
+{
+	struct sii8620 *ctx =
+		container_of(self, struct sii8620, extcon_nb);
+
+	schedule_work(&ctx->extcon_wq);
+
+	return NOTIFY_DONE;
+}
+
+static int sii8620_extcon_init(struct sii8620 *ctx)
+{
+	struct extcon_dev *edev;
+	struct device_node *musb, *muic;
+	int ret;
+
+	/* get micro-USB connector node */
+	musb = of_graph_get_remote_node(ctx->dev->of_node, 1, -1);
+	/* next get micro-USB Interface Controller node */
+	muic = of_get_next_parent(musb);
+
+	if (!muic) {
+		dev_info(ctx->dev, "no extcon found, switching to 'always on' mode\n");
+		return 0;
+	}
+
+	edev = extcon_find_edev_by_node(muic);
+	of_node_put(muic);
+	if (IS_ERR(edev)) {
+		if (PTR_ERR(edev) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		dev_err(ctx->dev, "Invalid or missing extcon\n");
+		return PTR_ERR(edev);
+	}
+
+	ctx->extcon = edev;
+	ctx->extcon_nb.notifier_call = sii8620_extcon_notifier;
+	INIT_WORK(&ctx->extcon_wq, sii8620_extcon_work);
+	ret = extcon_register_notifier(edev, EXTCON_DISP_MHL, &ctx->extcon_nb);
+	if (ret) {
+		dev_err(ctx->dev, "failed to register notifier for MHL\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 static inline struct sii8620 *bridge_to_sii8620(struct drm_bridge *bridge)
 {
 	return container_of(bridge, struct sii8620, bridge);
@@ -2302,13 +2379,20 @@ static int sii8620_probe(struct i2c_client *client,
 	if (ret)
 		return ret;
 
+	ret = sii8620_extcon_init(ctx);
+	if (ret < 0) {
+		dev_err(ctx->dev, "failed to initialize EXTCON\n");
+		return ret;
+	}
+
 	i2c_set_clientdata(client, ctx);
 
 	ctx->bridge.funcs = &sii8620_bridge_funcs;
 	ctx->bridge.of_node = dev->of_node;
 	drm_bridge_add(&ctx->bridge);
 
-	sii8620_cable_in(ctx);
+	if (!ctx->extcon)
+		sii8620_cable_in(ctx);
 
 	return 0;
 }
@@ -2317,8 +2401,15 @@ static int sii8620_remove(struct i2c_client *client)
 {
 	struct sii8620 *ctx = i2c_get_clientdata(client);
 
-	disable_irq(to_i2c_client(ctx->dev)->irq);
-	sii8620_hw_off(ctx);
+	if (ctx->extcon) {
+		extcon_unregister_notifier(ctx->extcon, EXTCON_DISP_MHL,
+					   &ctx->extcon_nb);
+		flush_work(&ctx->extcon_wq);
+		if (ctx->cable_state > 0)
+			sii8620_cable_out(ctx);
+	} else {
+		sii8620_cable_out(ctx);
+	}
 	drm_bridge_remove(&ctx->bridge);
 
 	return 0;

drivers/hv/Kconfig

+# SPDX-License-Identifier: GPL-2.0
+
 menu "Microsoft Hyper-V guest support"
 
 config HYPERV

drivers/hv/Makefile

@@ -4,6 +4,7 @@ obj-$(CONFIG_HYPERV_UTILS)	+= hv_utils.o
 obj-$(CONFIG_HYPERV_BALLOON)	+= hv_balloon.o
 
 CFLAGS_hv_trace.o = -I$(src)
+CFLAGS_hv_balloon.o = -I$(src)
 
 hv_vmbus-y := vmbus_drv.o \
 		 hv.o connection.o channel.o \

drivers/hv/channel_mgmt.c

@@ -71,7 +71,7 @@ static const struct vmbus_device vmbus_devs[] = {
 	/* PCIE */
 	{ .dev_type = HV_PCIE,
 	  HV_PCIE_GUID,
-	  .perf_device = true,
+	  .perf_device = false,
 	},
 
 	/* Synthetic Frame Buffer */
@@ -596,10 +596,8 @@ static int next_numa_node_id;
 /*
  * Starting with Win8, we can statically distribute the incoming
  * channel interrupt load by binding a channel to VCPU.
- * We do this in a hierarchical fashion:
- * First distribute the primary channels across available NUMA nodes
- * and then distribute the subchannels amongst the CPUs in the NUMA
- * node assigned to the primary channel.
+ * We distribute the interrupt loads to one or more NUMA nodes based on
+ * the channel's affinity_policy.
  *
  * For pre-win8 hosts or non-performance critical channels we assign the
  * first CPU in the first NUMA node.

drivers/hv/hv.c

@@ -27,7 +27,7 @@
 #include <linux/vmalloc.h>
 #include <linux/hyperv.h>
 #include <linux/version.h>
-#include <linux/interrupt.h>
+#include <linux/random.h>
 #include <linux/clockchips.h>
 #include <asm/hyperv.h>
 #include <asm/mshyperv.h>
@@ -38,6 +38,17 @@ struct hv_context hv_context = {
 	.synic_initialized	= false,
 };
 
+/*
+ * If false, we're using the old mechanism for stimer0 interrupts
+ * where it sends a VMbus message when it expires. The old
+ * mechanism is used when running on older versions of Hyper-V
+ * that don't support Direct Mode. While Hyper-V provides
+ * four stimer's per CPU, Linux uses only stimer0.
+ */
+static bool direct_mode_enabled;
+static int stimer0_irq;
+static int stimer0_vector;
+
 #define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */
 #define HV_MAX_MAX_DELTA_TICKS 0xffffffff
 #define HV_MIN_DELTA_TICKS 1
@@ -53,6 +64,8 @@ int hv_init(void)
 	if (!hv_context.cpu_context)
 		return -ENOMEM;
 
+	direct_mode_enabled = ms_hyperv.misc_features &
+			HV_X64_STIMER_DIRECT_MODE_AVAILABLE;
 	return 0;
 }
 
@@ -91,6 +104,21 @@ int hv_post_message(union hv_connection_id connection_id,
 	return status & 0xFFFF;
 }
 
+/*
+ * ISR for when stimer0 is operating in Direct Mode.  Direct Mode
+ * does not use VMbus or any VMbus messages, so process here and not
+ * in the VMbus driver code.
+ */
+
+static void hv_stimer0_isr(void)
+{
+	struct hv_per_cpu_context *hv_cpu;
+
+	hv_cpu = this_cpu_ptr(hv_context.cpu_context);
+	hv_cpu->clk_evt->event_handler(hv_cpu->clk_evt);
+	add_interrupt_randomness(stimer0_vector, 0);
+}
+
 static int hv_ce_set_next_event(unsigned long delta,
 				struct clock_event_device *evt)
 {
@@ -108,6 +136,8 @@ static int hv_ce_shutdown(struct clock_event_device *evt)
 {
 	hv_init_timer(HV_X64_MSR_STIMER0_COUNT, 0);
 	hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, 0);
+	if (direct_mode_enabled)
+		hv_disable_stimer0_percpu_irq(stimer0_irq);
 
 	return 0;
 }
@@ -116,11 +146,26 @@ static int hv_ce_set_oneshot(struct clock_event_device *evt)
 {
 	union hv_timer_config timer_cfg;
 
+	timer_cfg.as_uint64 = 0;
 	timer_cfg.enable = 1;
 	timer_cfg.auto_enable = 1;
-	timer_cfg.sintx = VMBUS_MESSAGE_SINT;
+	if (direct_mode_enabled) {
+		/*
+		 * When it expires, the timer will directly interrupt
+		 * on the specified hardware vector/IRQ.
+		 */
+		timer_cfg.direct_mode = 1;
+		timer_cfg.apic_vector = stimer0_vector;
+		hv_enable_stimer0_percpu_irq(stimer0_irq);
+	} else {
+		/*
+		 * When it expires, the timer will generate a VMbus message,
+		 * to be handled by the normal VMbus interrupt handler.
+		 */
+		timer_cfg.direct_mode = 0;
+		timer_cfg.sintx = VMBUS_MESSAGE_SINT;
+	}
 	hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
-
 	return 0;
 }
 
@@ -147,7 +192,7 @@ int hv_synic_alloc(void)
 	int cpu;
 
 	hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
-					 GFP_ATOMIC);
+					 GFP_KERNEL);
 	if (hv_context.hv_numa_map == NULL) {
 		pr_err("Unable to allocate NUMA map\n");
 		goto err;
@@ -191,6 +236,11 @@ int hv_synic_alloc(void)
 		INIT_LIST_HEAD(&hv_cpu->chan_list);
 	}
 
+	if (direct_mode_enabled &&
+	    hv_setup_stimer0_irq(&stimer0_irq, &stimer0_vector,
+				hv_stimer0_isr))
+		goto err;
+
 	return 0;
 err:
 	return -ENOMEM;
@@ -217,7 +267,7 @@ void hv_synic_free(void)
 }
 
 /*
- * hv_synic_init - Initialize the Synthethic Interrupt Controller.
+ * hv_synic_init - Initialize the Synthetic Interrupt Controller.
  *
  * If it is already initialized by another entity (ie x2v shim), we need to
  * retrieve the initialized message and event pages.  Otherwise, we create and
@@ -252,7 +302,6 @@ int hv_synic_init(unsigned int cpu)
 	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
 			    shared_sint.as_uint64);
 
-	shared_sint.as_uint64 = 0;
 	shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
 	shared_sint.masked = false;
 	if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)
@@ -292,6 +341,9 @@ void hv_synic_clockevents_cleanup(void)
 	if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
 		return;
 
+	if (direct_mode_enabled)
+		hv_remove_stimer0_irq(stimer0_irq);
+
 	for_each_present_cpu(cpu) {
 		struct hv_per_cpu_context *hv_cpu
 			= per_cpu_ptr(hv_context.cpu_context, cpu);

drivers/hv/hv_balloon.c

@@ -34,6 +34,9 @@
 
 #include <linux/hyperv.h>
 
+#define CREATE_TRACE_POINTS
+#include "hv_trace_balloon.h"
+
 /*
  * We begin with definitions supporting the Dynamic Memory protocol
  * with the host.
@@ -576,11 +579,65 @@ static struct hv_dynmem_device dm_device;
 static void post_status(struct hv_dynmem_device *dm);
 
 #ifdef CONFIG_MEMORY_HOTPLUG
+static inline bool has_pfn_is_backed(struct hv_hotadd_state *has,
+				     unsigned long pfn)
+{
+	struct hv_hotadd_gap *gap;
+
+	/* The page is not backed. */
+	if ((pfn < has->covered_start_pfn) || (pfn >= has->covered_end_pfn))
+		return false;
+
+	/* Check for gaps. */
+	list_for_each_entry(gap, &has->gap_list, list) {
+		if ((pfn >= gap->start_pfn) && (pfn < gap->end_pfn))
+			return false;
+	}
+
+	return true;
+}
+
+static unsigned long hv_page_offline_check(unsigned long start_pfn,
+					   unsigned long nr_pages)
+{
+	unsigned long pfn = start_pfn, count = 0;
+	struct hv_hotadd_state *has;
+	bool found;
+
+	while (pfn < start_pfn + nr_pages) {
+		/*
+		 * Search for HAS which covers the pfn and when we find one
+		 * count how many consequitive PFNs are covered.
+		 */
+		found = false;
+		list_for_each_entry(has, &dm_device.ha_region_list, list) {
+			while ((pfn >= has->start_pfn) &&
+			       (pfn < has->end_pfn) &&
+			       (pfn < start_pfn + nr_pages)) {
+				found = true;
+				if (has_pfn_is_backed(has, pfn))
+					count++;
+				pfn++;
+			}
+		}
+
+		/*
+		 * This PFN is not in any HAS (e.g. we're offlining a region
+		 * which was present at boot), no need to account for it. Go
+		 * to the next one.
+		 */
+		if (!found)
+			pfn++;
+	}
+
+	return count;
+}
+
 static int hv_memory_notifier(struct notifier_block *nb, unsigned long val,
 			      void *v)
 {
 	struct memory_notify *mem = (struct memory_notify *)v;
-	unsigned long flags;
+	unsigned long flags, pfn_count;
 
 	switch (val) {
 	case MEM_ONLINE:
@@ -593,7 +650,19 @@ static int hv_memory_notifier(struct notifier_block *nb, unsigned long val,
 
 	case MEM_OFFLINE:
 		spin_lock_irqsave(&dm_device.ha_lock, flags);
-		dm_device.num_pages_onlined -= mem->nr_pages;
+		pfn_count = hv_page_offline_check(mem->start_pfn,
+						  mem->nr_pages);
+		if (pfn_count <= dm_device.num_pages_onlined) {
+			dm_device.num_pages_onlined -= pfn_count;
+		} else {
+			/*
+			 * We're offlining more pages than we managed to online.
+			 * This is unexpected. In any case don't let
+			 * num_pages_onlined wrap around zero.
+			 */
+			WARN_ON_ONCE(1);
+			dm_device.num_pages_onlined = 0;
+		}
 		spin_unlock_irqrestore(&dm_device.ha_lock, flags);
 		break;
 	case MEM_GOING_ONLINE:
@@ -612,30 +681,9 @@ static struct notifier_block hv_memory_nb = {
 /* Check if the particular page is backed and can be onlined and online it. */
 static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg)
 {
-	unsigned long cur_start_pgp;
-	unsigned long cur_end_pgp;
-	struct hv_hotadd_gap *gap;
-
-	cur_start_pgp = (unsigned long)pfn_to_page(has->covered_start_pfn);
-	cur_end_pgp = (unsigned long)pfn_to_page(has->covered_end_pfn);
-
-	/* The page is not backed. */
-	if (((unsigned long)pg < cur_start_pgp) ||
-	    ((unsigned long)pg >= cur_end_pgp))
+	if (!has_pfn_is_backed(has, page_to_pfn(pg)))
 		return;
 
-	/* Check for gaps. */
-	list_for_each_entry(gap, &has->gap_list, list) {
-		cur_start_pgp = (unsigned long)
-			pfn_to_page(gap->start_pfn);
-		cur_end_pgp = (unsigned long)
-			pfn_to_page(gap->end_pfn);
-		if (((unsigned long)pg >= cur_start_pgp) &&
-		    ((unsigned long)pg < cur_end_pgp)) {
-			return;
-		}
-	}
-
 	/* This frame is currently backed; online the page. */
 	__online_page_set_limits(pg);
 	__online_page_increment_counters(pg);
@@ -691,7 +739,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
 				(HA_CHUNK << PAGE_SHIFT));
 
 		if (ret) {
-			pr_warn("hot_add memory failed error is %d\n", ret);
+			pr_err("hot_add memory failed error is %d\n", ret);
 			if (ret == -EEXIST) {
 				/*
 				 * This error indicates that the error
@@ -726,19 +774,13 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
 static void hv_online_page(struct page *pg)
 {
 	struct hv_hotadd_state *has;
-	unsigned long cur_start_pgp;
-	unsigned long cur_end_pgp;
 	unsigned long flags;
+	unsigned long pfn = page_to_pfn(pg);
 
 	spin_lock_irqsave(&dm_device.ha_lock, flags);
 	list_for_each_entry(has, &dm_device.ha_region_list, list) {
-		cur_start_pgp = (unsigned long)
-			pfn_to_page(has->start_pfn);
-		cur_end_pgp = (unsigned long)pfn_to_page(has->end_pfn);
-
 		/* The page belongs to a different HAS. */
-		if (((unsigned long)pg < cur_start_pgp) ||
-		    ((unsigned long)pg >= cur_end_pgp))
+		if ((pfn < has->start_pfn) || (pfn >= has->end_pfn))
 			continue;
 
 		hv_page_online_one(has, pg);
@@ -1014,7 +1056,7 @@ static void hot_add_req(struct work_struct *dummy)
 		resp.result = 0;
 
 	if (!do_hot_add || (resp.page_count == 0))
-		pr_info("Memory hot add failed\n");
+		pr_err("Memory hot add failed\n");
 
 	dm->state = DM_INITIALIZED;
 	resp.hdr.trans_id = atomic_inc_return(&trans_id);
@@ -1041,7 +1083,7 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
 
 		break;
 	default:
-		pr_info("Received Unknown type: %d\n", info_hdr->type);
+		pr_warn("Received Unknown type: %d\n", info_hdr->type);
 	}
 }
 
@@ -1120,6 +1162,9 @@ static void post_status(struct hv_dynmem_device *dm)
 		 dm->num_pages_added - dm->num_pages_onlined : 0) +
 		compute_balloon_floor();
 
+	trace_balloon_status(status.num_avail, status.num_committed,
+			     vm_memory_committed(), dm->num_pages_ballooned,
+			     dm->num_pages_added, dm->num_pages_onlined);
 	/*
 	 * If our transaction ID is no longer current, just don't
 	 * send the status. This can happen if we were interrupted
@@ -1290,7 +1335,7 @@ static void balloon_up(struct work_struct *dummy)
 			/*
 			 * Free up the memory we allocatted.
 			 */
-			pr_info("Balloon response failed\n");
+			pr_err("Balloon response failed\n");
 
 			for (i = 0; i < bl_resp->range_count; i++)
 				free_balloon_pages(&dm_device,
@@ -1421,7 +1466,7 @@ static void cap_resp(struct hv_dynmem_device *dm,
 			struct dm_capabilities_resp_msg *cap_resp)
 {
 	if (!cap_resp->is_accepted) {
-		pr_info("Capabilities not accepted by host\n");
+		pr_err("Capabilities not accepted by host\n");
 		dm->state = DM_INIT_ERROR;
 	}
 	complete(&dm->host_event);
@@ -1508,7 +1553,7 @@ static void balloon_onchannelcallback(void *context)
 			break;
 
 		default:
-			pr_err("Unhandled message: type: %d\n", dm_hdr->type);
+			pr_warn("Unhandled message: type: %d\n", dm_hdr->type);
 
 		}
 	}

drivers/hv/hv_trace.c

+// SPDX-License-Identifier: GPL-2.0
+
 #include "hyperv_vmbus.h"
 
 #define CREATE_TRACE_POINTS

drivers/hv/hv_trace.h

+// SPDX-License-Identifier: GPL-2.0
+
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM hyperv
 

drivers/hv/hv_trace_balloon.h

+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM hyperv
+
+#if !defined(_HV_TRACE_BALLOON_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _HV_TRACE_BALLOON_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(balloon_status,
+	    TP_PROTO(u64 available, u64 committed,
+		     unsigned long vm_memory_committed,
+		     unsigned long pages_ballooned,
+		     unsigned long pages_added,
+		     unsigned long pages_onlined),
+	    TP_ARGS(available, committed, vm_memory_committed,
+		    pages_ballooned, pages_added, pages_onlined),
+	    TP_STRUCT__entry(
+		    __field(u64, available)
+		    __field(u64, committed)
+		    __field(unsigned long, vm_memory_committed)
+		    __field(unsigned long, pages_ballooned)
+		    __field(unsigned long, pages_added)
+		    __field(unsigned long, pages_onlined)
+		    ),
+	    TP_fast_assign(
+		    __entry->available = available;
+		    __entry->committed = committed;
+		    __entry->vm_memory_committed = vm_memory_committed;
+		    __entry->pages_ballooned = pages_ballooned;
+		    __entry->pages_added = pages_added;
+		    __entry->pages_onlined = pages_onlined;
+		    ),
+	    TP_printk("available %lld, committed %lld; vm_memory_committed %ld;"
+		      " pages_ballooned %ld, pages_added %ld, pages_onlined %ld",
+		      __entry->available, __entry->committed,
+		      __entry->vm_memory_committed, __entry->pages_ballooned,
+		      __entry->pages_added, __entry->pages_onlined
+		    )
+	);
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE hv_trace_balloon
+#endif /* _HV_TRACE_BALLOON_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

drivers/hv/hyperv_vmbus.h

@@ -57,7 +57,9 @@ union hv_timer_config {
 		u64 periodic:1;
 		u64 lazy:1;
 		u64 auto_enable:1;
-		u64 reserved_z0:12;
+		u64 apic_vector:8;
+		u64 direct_mode:1;
+		u64 reserved_z0:3;
 		u64 sintx:4;
 		u64 reserved_z1:44;
 	};

drivers/hwtracing/Kconfig

+menu "HW tracing support"
+
+source "drivers/hwtracing/stm/Kconfig"
+
+source "drivers/hwtracing/intel_th/Kconfig"
+
+endmenu

drivers/hwtracing/coresight/coresight-cpu-debug.c

@@ -315,7 +315,7 @@ static void debug_dump_regs(struct debug_drvdata *drvdata)
 	}
 
 	pc = debug_adjust_pc(drvdata);
-	dev_emerg(dev, " EDPCSR:  [<%p>] %pS\n", (void *)pc, (void *)pc);
+	dev_emerg(dev, " EDPCSR:  [<%px>] %pS\n", (void *)pc, (void *)pc);
 
 	if (drvdata->edcidsr_present)
 		dev_emerg(dev, " EDCIDSR: %08x\n", drvdata->edcidsr);

drivers/hwtracing/coresight/coresight-etm4x-sysfs.c

@@ -1780,7 +1780,7 @@ static ssize_t ctxid_masks_store(struct device *dev,
 		 */
 		for (j = 0; j < 8; j++) {
 			if (maskbyte & 1)
-				config->ctxid_pid[i] &= ~(0xFF << (j * 8));
+				config->ctxid_pid[i] &= ~(0xFFUL << (j * 8));
 			maskbyte >>= 1;
 		}
 		/* Select the next ctxid comparator mask value */
@@ -1963,7 +1963,7 @@ static ssize_t vmid_masks_store(struct device *dev,
 		 */
 		for (j = 0; j < 8; j++) {
 			if (maskbyte & 1)
-				config->vmid_val[i] &= ~(0xFF << (j * 8));
+				config->vmid_val[i] &= ~(0xFFUL << (j * 8));
 			maskbyte >>= 1;
 		}
 		/* Select the next vmid comparator mask value */

drivers/hwtracing/intel_th/Kconfig

@@ -25,6 +25,18 @@ config INTEL_TH_PCI
 
 	  Say Y here to enable PCI Intel TH support.
 
+config INTEL_TH_ACPI
+	tristate "Intel(R) Trace Hub ACPI controller"
+	depends on ACPI
+	help
+	  Intel(R) Trace Hub may exist as an ACPI device. This option enables
+	  support glue layer for ACPI-based Intel TH. This typically implies
+	  'host debugger' mode, that is, the trace configuration and capture
+	  is handled by an external debug host and corresponding controls will
+	  not be available on the target.
+
+	  Say Y here to enable ACPI Intel TH support.
+
 config INTEL_TH_GTH
 	tristate "Intel(R) Trace Hub Global Trace Hub"
 	help

drivers/hwtracing/intel_th/Makefile

@@ -6,6 +6,9 @@ intel_th-$(CONFIG_INTEL_TH_DEBUG) += debug.o
 obj-$(CONFIG_INTEL_TH_PCI)	+= intel_th_pci.o
 intel_th_pci-y			:= pci.o
 
+obj-$(CONFIG_INTEL_TH_ACPI)	+= intel_th_acpi.o
+intel_th_acpi-y			:= acpi.o
+
 obj-$(CONFIG_INTEL_TH_GTH)	+= intel_th_gth.o
 intel_th_gth-y			:= gth.o
 

drivers/hwtracing/intel_th/acpi.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel(R) Trace Hub ACPI driver
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+
+#include "intel_th.h"
+
+#define DRIVER_NAME "intel_th_acpi"
+
+static const struct intel_th_drvdata intel_th_acpi_pch = {
+	.host_mode_only	= 1,
+};
+
+static const struct intel_th_drvdata intel_th_acpi_uncore = {
+	.host_mode_only	= 1,
+};
+
+static const struct acpi_device_id intel_th_acpi_ids[] = {
+	{ "INTC1000",	(kernel_ulong_t)&intel_th_acpi_uncore },
+	{ "INTC1001",	(kernel_ulong_t)&intel_th_acpi_pch },
+	{ "",		0 },
+};
+
+MODULE_DEVICE_TABLE(acpi, intel_th_acpi_ids);
+
+static int intel_th_acpi_probe(struct platform_device *pdev)
+{
+	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
+	const struct acpi_device_id *id;
+	struct intel_th *th;
+
+	id = acpi_match_device(intel_th_acpi_ids, &pdev->dev);
+	if (!id)
+		return -ENODEV;
+
+	th = intel_th_alloc(&pdev->dev, (void *)id->driver_data,
+			    pdev->resource, pdev->num_resources, -1);
+	if (IS_ERR(th))
+		return PTR_ERR(th);
+
+	adev->driver_data = th;
+
+	return 0;
+}
+
+static int intel_th_acpi_remove(struct platform_device *pdev)
+{
+	struct intel_th *th = platform_get_drvdata(pdev);
+
+	intel_th_free(th);
+
+	return 0;
+}
+
+static struct platform_driver intel_th_acpi_driver = {
+	.probe		= intel_th_acpi_probe,
+	.remove		= intel_th_acpi_remove,
+	.driver		= {
+		.name			= DRIVER_NAME,
+		.acpi_match_table	= intel_th_acpi_ids,
+	},
+};
+
+module_platform_driver(intel_th_acpi_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel(R) Trace Hub ACPI controller driver");
+MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>");

drivers/hwtracing/intel_th/core.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub driver core
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
@@ -638,7 +630,8 @@ intel_th_subdevice_alloc(struct intel_th *th,
 		thdev->output.port = -1;
 		thdev->output.scratchpad = subdev->scrpd;
 	} else if (subdev->type == INTEL_TH_SWITCH) {
-		thdev->host_mode = host_mode;
+		thdev->host_mode =
+			INTEL_TH_CAP(th, host_mode_only) ? true : host_mode;
 		th->hub = thdev;
 	}
 
@@ -737,7 +730,8 @@ static int intel_th_populate(struct intel_th *th)
 		struct intel_th_device *thdev;
 
 		/* only allow SOURCE and SWITCH devices in host mode */
-		if (host_mode && subdev->type == INTEL_TH_OUTPUT)
+		if ((INTEL_TH_CAP(th, host_mode_only) || host_mode) &&
+		    subdev->type == INTEL_TH_OUTPUT)
 			continue;
 
 		/*
@@ -813,7 +807,14 @@ intel_th_alloc(struct device *dev, struct intel_th_drvdata *drvdata,
 	       struct resource *devres, unsigned int ndevres, int irq)
 {
 	struct intel_th *th;
-	int err;
+	int err, r;
+
+	if (irq == -1)
+		for (r = 0; r < ndevres; r++)
+			if (devres[r].flags & IORESOURCE_IRQ) {
+				irq = devres[r].start;
+				break;
+			}
 
 	th = kzalloc(sizeof(*th), GFP_KERNEL);
 	if (!th)
@@ -935,9 +936,13 @@ EXPORT_SYMBOL_GPL(intel_th_trace_disable);
 int intel_th_set_output(struct intel_th_device *thdev,
 			unsigned int master)
 {
-	struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
+	struct intel_th_device *hub = to_intel_th_hub(thdev);
 	struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
 
+	/* In host mode, this is up to the external debugger, do nothing. */
+	if (hub->host_mode)
+		return 0;
+
 	if (!hubdrv->set_output)
 		return -ENOTSUPP;
 

drivers/hwtracing/intel_th/debug.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub driver debugging
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #include <linux/types.h>

drivers/hwtracing/intel_th/debug.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Intel(R) Trace Hub driver debugging
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #ifndef __INTEL_TH_DEBUG_H__

drivers/hwtracing/intel_th/gth.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub Global Trace Hub
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

drivers/hwtracing/intel_th/gth.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Intel(R) Trace Hub Global Trace Hub (GTH) data structures
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #ifndef __INTEL_TH_GTH_H__

drivers/hwtracing/intel_th/intel_th.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Intel(R) Trace Hub data structures
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #ifndef __INTEL_TH_H__
@@ -50,9 +42,11 @@ struct intel_th_output {
 /**
  * struct intel_th_drvdata - describes hardware capabilities and quirks
  * @tscu_enable:	device needs SW to enable time stamping unit
+ * @host_mode_only:	device can only operate in 'host debugger' mode
  */
 struct intel_th_drvdata {
-	unsigned int	tscu_enable        : 1;
+	unsigned int	tscu_enable        : 1,
+			host_mode_only     : 1;
 };
 
 #define INTEL_TH_CAP(_th, _cap) ((_th)->drvdata ? (_th)->drvdata->_cap : 0)

drivers/hwtracing/intel_th/msu.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub Memory Storage Unit
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

drivers/hwtracing/intel_th/msu.h

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub Memory Storage Unit (MSU) data structures
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #ifndef __INTEL_TH_MSU_H__

drivers/hwtracing/intel_th/pci.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub pci driver
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

drivers/hwtracing/intel_th/pti.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub PTI output driver
  *
  * Copyright (C) 2014-2016 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

drivers/hwtracing/intel_th/pti.h

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub PTI output data structures
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #ifndef __INTEL_TH_STH_H__

drivers/hwtracing/intel_th/sth.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub Software Trace Hub support
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

drivers/hwtracing/intel_th/sth.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Intel(R) Trace Hub Software Trace Hub (STH) data structures
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #ifndef __INTEL_TH_STH_H__

drivers/hwtracing/stm/console.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Simple kernel console driver for STM devices
  * Copyright (c) 2014, Intel Corporation.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
  * STM console will send kernel messages over STM devices to a trace host.
  */
 

drivers/hwtracing/stm/core.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * System Trace Module (STM) infrastructure
  * Copyright (c) 2014, Intel Corporation.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
  * STM class implements generic infrastructure for  System Trace Module devices
  * as defined in MIPI STPv2 specification.
  */

drivers/hwtracing/stm/dummy_stm.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * A dummy STM device for stm/stm_source class testing.
  * Copyright (c) 2014, Intel Corporation.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
  * STM class implements generic infrastructure for  System Trace Module devices
  * as defined in MIPI STPv2 specification.
  */
@@ -20,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/stm.h>
+#include <uapi/linux/stm.h>
 
 static ssize_t notrace
 dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
@@ -52,6 +45,18 @@ static unsigned int fail_mode;
 
 module_param(fail_mode, int, 0600);
 
+static unsigned int master_min;
+
+module_param(master_min, int, 0400);
+
+static unsigned int master_max = STP_MASTER_MAX;
+
+module_param(master_max, int, 0400);
+
+static unsigned int nr_channels = STP_CHANNEL_MAX;
+
+module_param(nr_channels, int, 0400);
+
 static int dummy_stm_link(struct stm_data *data, unsigned int master,
 			  unsigned int channel)
 {
@@ -68,14 +73,19 @@ static int dummy_stm_init(void)
 	if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX)
 		return -EINVAL;
 
+	if (master_min > master_max ||
+	    master_max > STP_MASTER_MAX ||
+	    nr_channels > STP_CHANNEL_MAX)
+		return -EINVAL;
+
 	for (i = 0; i < nr_dummies; i++) {
 		dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i);
 		if (!dummy_stm[i].name)
 			goto fail_unregister;
 
-		dummy_stm[i].sw_start		= 0x0000;
-		dummy_stm[i].sw_end		= 0xffff;
-		dummy_stm[i].sw_nchannels	= 0xffff;
+		dummy_stm[i].sw_start		= master_min;
+		dummy_stm[i].sw_end		= master_max;
+		dummy_stm[i].sw_nchannels	= nr_channels;
 		dummy_stm[i].packet		= dummy_stm_packet;
 		dummy_stm[i].link		= dummy_stm_link;
 

drivers/hwtracing/stm/heartbeat.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Simple heartbeat STM source driver
  * Copyright (c) 2016, Intel Corporation.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
  * Heartbeat STM source will send repetitive messages over STM devices to a
  * trace host.
  */

drivers/hwtracing/stm/policy.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * System Trace Module (STM) master/channel allocation policy management
  * Copyright (c) 2014, Intel Corporation.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
  * A master/channel allocation policy allows mapping string identifiers to
  * master and channel ranges, where allocation can be done.
  */

drivers/hwtracing/stm/stm.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * System Trace Module (STM) infrastructure
  * Copyright (c) 2014, Intel Corporation.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
  * STM class implements generic infrastructure for  System Trace Module devices
  * as defined in MIPI STPv2 specification.
  */

drivers/mcb/mcb-pci.c

@@ -117,6 +117,7 @@ static void mcb_pci_remove(struct pci_dev *pdev)
 
 static const struct pci_device_id mcb_pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_MEN_CHAMELEON) },
 	{ 0 },
 };
 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);

drivers/misc/Kconfig

@@ -75,7 +75,6 @@ config ATMEL_TCB_CLKSRC
 config ATMEL_TCB_CLKSRC_BLOCK
 	int
 	depends on ATMEL_TCB_CLKSRC
-	prompt "TC Block" if CPU_AT32AP700X
 	default 0
 	range 0 1
 	help

drivers/misc/Makefile

@@ -12,7 +12,7 @@ obj-$(CONFIG_ATMEL_SSC)		+= atmel-ssc.o
 obj-$(CONFIG_ATMEL_TCLIB)	+= atmel_tclib.o
 obj-$(CONFIG_DUMMY_IRQ)		+= dummy-irq.o
 obj-$(CONFIG_ICS932S401)	+= ics932s401.o
-obj-$(CONFIG_LKDTM)		+= lkdtm.o
+obj-$(CONFIG_LKDTM)		+= lkdtm/
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
 obj-$(CONFIG_PHANTOM)		+= phantom.o
@@ -57,21 +57,3 @@ obj-$(CONFIG_ASPEED_LPC_SNOOP)	+= aspeed-lpc-snoop.o
 obj-$(CONFIG_PCI_ENDPOINT_TEST)	+= pci_endpoint_test.o
 obj-$(CONFIG_OCXL)		+= ocxl/
 obj-$(CONFIG_MISC_RTSX)		+= cardreader/
-
-lkdtm-$(CONFIG_LKDTM)		+= lkdtm_core.o
-lkdtm-$(CONFIG_LKDTM)		+= lkdtm_bugs.o
-lkdtm-$(CONFIG_LKDTM)		+= lkdtm_heap.o
-lkdtm-$(CONFIG_LKDTM)		+= lkdtm_perms.o
-lkdtm-$(CONFIG_LKDTM)		+= lkdtm_refcount.o
-lkdtm-$(CONFIG_LKDTM)		+= lkdtm_rodata_objcopy.o
-lkdtm-$(CONFIG_LKDTM)		+= lkdtm_usercopy.o
-
-KCOV_INSTRUMENT_lkdtm_rodata.o	:= n
-
-OBJCOPYFLAGS :=
-OBJCOPYFLAGS_lkdtm_rodata_objcopy.o := \
-			--set-section-flags .text=alloc,readonly \
-			--rename-section .text=.rodata
-targets += lkdtm_rodata.o lkdtm_rodata_objcopy.o
-$(obj)/lkdtm_rodata_objcopy.o: $(obj)/lkdtm_rodata.o FORCE
-	$(call if_changed,objcopy)

drivers/misc/aspeed-lpc-ctrl.c

@@ -7,6 +7,7 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#include <linux/clk.h>
 #include <linux/mfd/syscon.h>
 #include <linux/miscdevice.h>
 #include <linux/mm.h>
@@ -20,12 +21,17 @@
 
 #define DEVICE_NAME	"aspeed-lpc-ctrl"
 
+#define HICR5 0x0
+#define HICR5_ENL2H	BIT(8)
+#define HICR5_ENFWH	BIT(10)
+
 #define HICR7 0x8
 #define HICR8 0xc
 
 struct aspeed_lpc_ctrl {
 	struct miscdevice	miscdev;
 	struct regmap		*regmap;
+	struct clk		*clk;
 	phys_addr_t		mem_base;
 	resource_size_t		mem_size;
 	u32		pnor_size;
@@ -153,8 +159,18 @@ static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
 		if (rc)
 			return rc;
 
-		return regmap_write(lpc_ctrl->regmap, HICR8,
-			(~(map.size - 1)) | ((map.size >> 16) - 1));
+		rc = regmap_write(lpc_ctrl->regmap, HICR8,
+				(~(map.size - 1)) | ((map.size >> 16) - 1));
+		if (rc)
+			return rc;
+
+		/*
+		 * Enable LPC FHW cycles. This is required for the host to
+		 * access the regions specified.
+		 */
+		return regmap_update_bits(lpc_ctrl->regmap, HICR5,
+				HICR5_ENFWH | HICR5_ENL2H,
+				HICR5_ENFWH | HICR5_ENL2H);
 	}
 
 	return -EINVAL;
@@ -221,16 +237,33 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	lpc_ctrl->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(lpc_ctrl->clk)) {
+		dev_err(dev, "couldn't get clock\n");
+		return PTR_ERR(lpc_ctrl->clk);
+	}
+	rc = clk_prepare_enable(lpc_ctrl->clk);
+	if (rc) {
+		dev_err(dev, "couldn't enable clock\n");
+		return rc;
+	}
+
 	lpc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR;
 	lpc_ctrl->miscdev.name = DEVICE_NAME;
 	lpc_ctrl->miscdev.fops = &aspeed_lpc_ctrl_fops;
 	lpc_ctrl->miscdev.parent = dev;
 	rc = misc_register(&lpc_ctrl->miscdev);
-	if (rc)
+	if (rc) {
 		dev_err(dev, "Unable to register device\n");
-	else
-		dev_info(dev, "Loaded at %pr\n", &resm);
+		goto err;
+	}
+
+	dev_info(dev, "Loaded at %pr\n", &resm);
+
+	return 0;
 
+err:
+	clk_disable_unprepare(lpc_ctrl->clk);
 	return rc;
 }
 
@@ -239,6 +272,7 @@ static int aspeed_lpc_ctrl_remove(struct platform_device *pdev)
 	struct aspeed_lpc_ctrl *lpc_ctrl = dev_get_drvdata(&pdev->dev);
 
 	misc_deregister(&lpc_ctrl->miscdev);
+	clk_disable_unprepare(lpc_ctrl->clk);
 
 	return 0;
 }

drivers/misc/cardreader/rts5260.c

@@ -388,17 +388,17 @@ static void rts5260_disable_ocp(struct rtsx_pcr *pcr)
 				OC_POWER_DOWN);
 }
 
-int rts5260_get_ocpstat(struct rtsx_pcr *pcr, u8 *val)
+static int rts5260_get_ocpstat(struct rtsx_pcr *pcr, u8 *val)
 {
 	return rtsx_pci_read_register(pcr, REG_OCPSTAT, val);
 }
 
-int rts5260_get_ocpstat2(struct rtsx_pcr *pcr, u8 *val)
+static int rts5260_get_ocpstat2(struct rtsx_pcr *pcr, u8 *val)
 {
 	return rtsx_pci_read_register(pcr, REG_DV3318_OCPSTAT, val);
 }
 
-void rts5260_clear_ocpstat(struct rtsx_pcr *pcr)
+static void rts5260_clear_ocpstat(struct rtsx_pcr *pcr)
 {
 	u8 mask = 0;
 	u8 val = 0;
@@ -418,7 +418,7 @@ void rts5260_clear_ocpstat(struct rtsx_pcr *pcr)
 				DV3318_OCP_INT_CLR | DV3318_OCP_CLR, 0);
 }
 
-void rts5260_process_ocp(struct rtsx_pcr *pcr)
+static void rts5260_process_ocp(struct rtsx_pcr *pcr)
 {
 	if (!pcr->option.ocp_en)
 		return;
@@ -449,7 +449,7 @@ void rts5260_process_ocp(struct rtsx_pcr *pcr)
 	}
 }
 
-int rts5260_init_hw(struct rtsx_pcr *pcr)
+static int rts5260_init_hw(struct rtsx_pcr *pcr)
 {
 	int err;
 
@@ -620,7 +620,7 @@ static int rts5260_extra_init_hw(struct rtsx_pcr *pcr)
 	return 0;
 }
 
-void rts5260_set_aspm(struct rtsx_pcr *pcr, bool enable)
+static void rts5260_set_aspm(struct rtsx_pcr *pcr, bool enable)
 {
 	struct rtsx_cr_option *option = &pcr->option;
 	u8 val = 0;

drivers/misc/eeprom/at25.c

@@ -102,7 +102,7 @@ static int at25_ee_read(void *priv, unsigned int offset,
 	}
 
 	spi_message_init(&m);
-	memset(t, 0, sizeof t);
+	memset(t, 0, sizeof(t));
 
 	t[0].tx_buf = command;
 	t[0].len = at25->addrlen + 1;

drivers/misc/lkdtm/Makefile

+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_LKDTM)		+= lkdtm.o
+
+lkdtm-$(CONFIG_LKDTM)		+= core.o
+lkdtm-$(CONFIG_LKDTM)		+= bugs.o
+lkdtm-$(CONFIG_LKDTM)		+= heap.o
+lkdtm-$(CONFIG_LKDTM)		+= perms.o
+lkdtm-$(CONFIG_LKDTM)		+= refcount.o
+lkdtm-$(CONFIG_LKDTM)		+= rodata_objcopy.o
+lkdtm-$(CONFIG_LKDTM)		+= usercopy.o
+
+KCOV_INSTRUMENT_rodata.o	:= n
+
+OBJCOPYFLAGS :=
+OBJCOPYFLAGS_rodata_objcopy.o	:= \
+			--set-section-flags .text=alloc,readonly \
+			--rename-section .text=.rodata
+targets += rodata.o rodata_objcopy.o
+$(obj)/rodata_objcopy.o: $(obj)/rodata.o FORCE
+	$(call if_changed,objcopy)

drivers/misc/lkdtm_refcount.c → drivers/misc/lkdtm/refcount.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This is for all the tests related to refcount bugs (e.g. overflow,
  * underflow, reaching zero untested, etc).

drivers/misc/mei/bus.c

@@ -74,6 +74,23 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
 		goto out;
 	}
 
+	while (cl->tx_cb_queued >= bus->tx_queue_limit) {
+		mutex_unlock(&bus->device_lock);
+		rets = wait_event_interruptible(cl->tx_wait,
+				cl->writing_state == MEI_WRITE_COMPLETE ||
+				(!mei_cl_is_connected(cl)));
+		mutex_lock(&bus->device_lock);
+		if (rets) {
+			if (signal_pending(current))
+				rets = -EINTR;
+			goto out;
+		}
+		if (!mei_cl_is_connected(cl)) {
+			rets = -ENODEV;
+			goto out;
+		}
+	}
+
 	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
 	if (!cb) {
 		rets = -ENOMEM;
@@ -449,6 +466,29 @@ bool mei_cldev_enabled(struct mei_cl_device *cldev)
 }
 EXPORT_SYMBOL_GPL(mei_cldev_enabled);
 
+/**
+ * mei_cl_bus_module_get - acquire module of the underlying
+ *    hw driver.
+ *
+ * @cldev: mei client device
+ *
+ * Return: true on success; false if the module was removed.
+ */
+static bool mei_cl_bus_module_get(struct mei_cl_device *cldev)
+{
+	return try_module_get(cldev->bus->dev->driver->owner);
+}
+
+/**
+ * mei_cl_bus_module_put -  release the underlying hw module.
+ *
+ * @cldev: mei client device
+ */
+static void mei_cl_bus_module_put(struct mei_cl_device *cldev)
+{
+	module_put(cldev->bus->dev->driver->owner);
+}
+
 /**
  * mei_cldev_enable - enable me client device
  *     create connection with me client
@@ -487,9 +527,17 @@ int mei_cldev_enable(struct mei_cl_device *cldev)
 		goto out;
 	}
 
+	if (!mei_cl_bus_module_get(cldev)) {
+		dev_err(&cldev->dev, "get hw module failed");
+		ret = -ENODEV;
+		goto out;
+	}
+
 	ret = mei_cl_connect(cl, cldev->me_cl, NULL);
-	if (ret < 0)
+	if (ret < 0) {
 		dev_err(&cldev->dev, "cannot connect\n");
+		mei_cl_bus_module_put(cldev);
+	}
 
 out:
 	mutex_unlock(&bus->device_lock);
@@ -553,6 +601,8 @@ int mei_cldev_disable(struct mei_cl_device *cldev)
 		dev_err(bus->dev, "Could not disconnect from the ME client\n");
 
 out:
+	mei_cl_bus_module_put(cldev);
+
 	/* Flush queues and remove any pending read */
 	mei_cl_flush_queues(cl, NULL);
 	mei_cl_unlink(cl);
@@ -562,37 +612,6 @@ int mei_cldev_disable(struct mei_cl_device *cldev)
 }
 EXPORT_SYMBOL_GPL(mei_cldev_disable);
 
-/**
- * mei_cl_bus_module_get - acquire module of the underlying
- *    hw module.
- *
- * @cl: host client
- *
- * Return: true on success; false if the module was removed.
- */
-bool mei_cl_bus_module_get(struct mei_cl *cl)
-{
-	struct mei_cl_device *cldev = cl->cldev;
-
-	if (!cldev)
-		return true;
-
-	return try_module_get(cldev->bus->dev->driver->owner);
-}
-
-/**
- * mei_cl_bus_module_put -  release the underlying hw module.
- *
- * @cl: host client
- */
-void mei_cl_bus_module_put(struct mei_cl *cl)
-{
-	struct mei_cl_device *cldev = cl->cldev;
-
-	if (cldev)
-		module_put(cldev->bus->dev->driver->owner);
-}
-
 /**
  * mei_cl_device_find - find matching entry in the driver id table
  *

drivers/misc/mei/client.c

@@ -349,6 +349,36 @@ void mei_io_cb_free(struct mei_cl_cb *cb)
 	kfree(cb);
 }
 
+/**
+ * mei_tx_cb_queue - queue tx callback
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * @cb: mei callback struct
+ * @head: an instance of list to queue on
+ */
+static inline void mei_tx_cb_enqueue(struct mei_cl_cb *cb,
+				     struct list_head *head)
+{
+	list_add_tail(&cb->list, head);
+	cb->cl->tx_cb_queued++;
+}
+
+/**
+ * mei_tx_cb_dequeue - dequeue tx callback
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * @cb: mei callback struct to dequeue and free
+ */
+static inline void mei_tx_cb_dequeue(struct mei_cl_cb *cb)
+{
+	if (!WARN_ON(cb->cl->tx_cb_queued == 0))
+		cb->cl->tx_cb_queued--;
+
+	mei_io_cb_free(cb);
+}
+
 /**
  * mei_io_cb_init - allocate and initialize io callback
  *
@@ -377,49 +407,37 @@ static struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl,
 }
 
 /**
- * __mei_io_list_flush_cl - removes and frees cbs belonging to cl.
+ * mei_io_list_flush_cl - removes cbs belonging to the cl.
  *
  * @head:  an instance of our list structure
- * @cl:    host client, can be NULL for flushing the whole list
- * @free:  whether to free the cbs
+ * @cl:    host client
  */
-static void __mei_io_list_flush_cl(struct list_head *head,
-				   const struct mei_cl *cl, bool free)
+static void mei_io_list_flush_cl(struct list_head *head,
+				 const struct mei_cl *cl)
 {
 	struct mei_cl_cb *cb, *next;
 
-	/* enable removing everything if no cl is specified */
 	list_for_each_entry_safe(cb, next, head, list) {
-		if (!cl || mei_cl_cmp_id(cl, cb->cl)) {
+		if (mei_cl_cmp_id(cl, cb->cl))
 			list_del_init(&cb->list);
-			if (free)
-				mei_io_cb_free(cb);
-		}
 	}
 }
 
 /**
- * mei_io_list_flush_cl - removes list entry belonging to cl.
+ * mei_io_tx_list_free_cl - removes cb belonging to the cl and free them
  *
  * @head: An instance of our list structure
  * @cl: host client
  */
-static inline void mei_io_list_flush_cl(struct list_head *head,
-					const struct mei_cl *cl)
+static void mei_io_tx_list_free_cl(struct list_head *head,
+				   const struct mei_cl *cl)
 {
-	__mei_io_list_flush_cl(head, cl, false);
-}
+	struct mei_cl_cb *cb, *next;
 
-/**
- * mei_io_list_free_cl - removes cb belonging to cl and free them
- *
- * @head: An instance of our list structure
- * @cl: host client
- */
-static inline void mei_io_list_free_cl(struct list_head *head,
-				       const struct mei_cl *cl)
-{
-	__mei_io_list_flush_cl(head, cl, true);
+	list_for_each_entry_safe(cb, next, head, list) {
+		if (mei_cl_cmp_id(cl, cb->cl))
+			mei_tx_cb_dequeue(cb);
+	}
 }
 
 /**
@@ -538,8 +556,8 @@ int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
 	dev = cl->dev;
 
 	cl_dbg(dev, cl, "remove list entry belonging to cl\n");
-	mei_io_list_free_cl(&cl->dev->write_list, cl);
-	mei_io_list_free_cl(&cl->dev->write_waiting_list, cl);
+	mei_io_tx_list_free_cl(&cl->dev->write_list, cl);
+	mei_io_tx_list_free_cl(&cl->dev->write_waiting_list, cl);
 	mei_io_list_flush_cl(&cl->dev->ctrl_wr_list, cl);
 	mei_io_list_flush_cl(&cl->dev->ctrl_rd_list, cl);
 	mei_io_list_free_fp(&cl->rd_pending, fp);
@@ -756,8 +774,8 @@ static void mei_cl_set_disconnected(struct mei_cl *cl)
 		return;
 
 	cl->state = MEI_FILE_DISCONNECTED;
-	mei_io_list_free_cl(&dev->write_list, cl);
-	mei_io_list_free_cl(&dev->write_waiting_list, cl);
+	mei_io_tx_list_free_cl(&dev->write_list, cl);
+	mei_io_tx_list_free_cl(&dev->write_waiting_list, cl);
 	mei_io_list_flush_cl(&dev->ctrl_rd_list, cl);
 	mei_io_list_flush_cl(&dev->ctrl_wr_list, cl);
 	mei_cl_wake_all(cl);
@@ -765,8 +783,6 @@ static void mei_cl_set_disconnected(struct mei_cl *cl)
 	cl->tx_flow_ctrl_creds = 0;
 	cl->timer_count = 0;
 
-	mei_cl_bus_module_put(cl);
-
 	if (!cl->me_cl)
 		return;
 
@@ -1076,9 +1092,6 @@ int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
 
 	dev = cl->dev;
 
-	if (!mei_cl_bus_module_get(cl))
-		return -ENODEV;
-
 	rets = mei_cl_set_connecting(cl, me_cl);
 	if (rets)
 		goto nortpm;
@@ -1698,9 +1711,9 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb)
 
 out:
 	if (mei_hdr.msg_complete)
-		list_add_tail(&cb->list, &dev->write_waiting_list);
+		mei_tx_cb_enqueue(cb, &dev->write_waiting_list);
 	else
-		list_add_tail(&cb->list, &dev->write_list);
+		mei_tx_cb_enqueue(cb, &dev->write_list);
 
 	cb = NULL;
 	if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
@@ -1746,7 +1759,7 @@ void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
 
 	switch (cb->fop_type) {
 	case MEI_FOP_WRITE:
-		mei_io_cb_free(cb);
+		mei_tx_cb_dequeue(cb);
 		cl->writing_state = MEI_WRITE_COMPLETE;
 		if (waitqueue_active(&cl->tx_wait)) {
 			wake_up_interruptible(&cl->tx_wait);

drivers/misc/mei/debugfs.c

@@ -97,7 +97,7 @@ static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
 	int pos = 0;
 	int ret;
 
-#define HDR "   |me|host|state|rd|wr|\n"
+#define HDR "   |me|host|state|rd|wr|wrq\n"
 
 	if (!dev)
 		return -ENODEV;
@@ -130,9 +130,10 @@ static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
 	list_for_each_entry(cl, &dev->file_list, link) {
 
 		pos += scnprintf(buf + pos, bufsz - pos,
-			"%3d|%2d|%4d|%5d|%2d|%2d|\n",
+			"%3d|%2d|%4d|%5d|%2d|%2d|%3u\n",
 			i, mei_cl_me_id(cl), cl->host_client_id, cl->state,
-			!list_empty(&cl->rd_completed), cl->writing_state);
+			!list_empty(&cl->rd_completed), cl->writing_state,
+			cl->tx_cb_queued);
 		i++;
 	}
 out:

drivers/misc/mei/init.c

@@ -383,6 +383,7 @@ void mei_device_init(struct mei_device *dev,
 	INIT_LIST_HEAD(&dev->write_waiting_list);
 	INIT_LIST_HEAD(&dev->ctrl_wr_list);
 	INIT_LIST_HEAD(&dev->ctrl_rd_list);
+	dev->tx_queue_limit = MEI_TX_QUEUE_LIMIT_DEFAULT;
 
 	INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
 	INIT_WORK(&dev->reset_work, mei_reset_work);

drivers/misc/mei/main.c

@@ -291,6 +291,27 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 		goto out;
 	}
 
+	while (cl->tx_cb_queued >= dev->tx_queue_limit) {
+		if (file->f_flags & O_NONBLOCK) {
+			rets = -EAGAIN;
+			goto out;
+		}
+		mutex_unlock(&dev->device_lock);
+		rets = wait_event_interruptible(cl->tx_wait,
+				cl->writing_state == MEI_WRITE_COMPLETE ||
+				(!mei_cl_is_connected(cl)));
+		mutex_lock(&dev->device_lock);
+		if (rets) {
+			if (signal_pending(current))
+				rets = -EINTR;
+			goto out;
+		}
+		if (!mei_cl_is_connected(cl)) {
+			rets = -ENODEV;
+			goto out;
+		}
+	}
+
 	*offset = 0;
 	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
 	if (!cb) {
@@ -507,7 +528,6 @@ static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
 		break;
 
 	default:
-		dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd);
 		rets = -ENOIOCTLCMD;
 	}
 
@@ -580,6 +600,12 @@ static __poll_t mei_poll(struct file *file, poll_table *wait)
 			mei_cl_read_start(cl, mei_cl_mtu(cl), file);
 	}
 
+	if (req_events & (POLLOUT | POLLWRNORM)) {
+		poll_wait(file, &cl->tx_wait, wait);
+		if (cl->tx_cb_queued < dev->tx_queue_limit)
+			mask |= POLLOUT | POLLWRNORM;
+	}
+
 out:
 	mutex_unlock(&dev->device_lock);
 	return mask;
@@ -749,10 +775,48 @@ static ssize_t hbm_ver_drv_show(struct device *device,
 }
 static DEVICE_ATTR_RO(hbm_ver_drv);
 
+static ssize_t tx_queue_limit_show(struct device *device,
+				   struct device_attribute *attr, char *buf)
+{
+	struct mei_device *dev = dev_get_drvdata(device);
+	u8 size = 0;
+
+	mutex_lock(&dev->device_lock);
+	size = dev->tx_queue_limit;
+	mutex_unlock(&dev->device_lock);
+
+	return snprintf(buf, PAGE_SIZE, "%u\n", size);
+}
+
+static ssize_t tx_queue_limit_store(struct device *device,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	struct mei_device *dev = dev_get_drvdata(device);
+	u8 limit;
+	unsigned int inp;
+	int err;
+
+	err = kstrtouint(buf, 10, &inp);
+	if (err)
+		return err;
+	if (inp > MEI_TX_QUEUE_LIMIT_MAX || inp < MEI_TX_QUEUE_LIMIT_MIN)
+		return -EINVAL;
+	limit = inp;
+
+	mutex_lock(&dev->device_lock);
+	dev->tx_queue_limit = limit;
+	mutex_unlock(&dev->device_lock);
+
+	return count;
+}
+static DEVICE_ATTR_RW(tx_queue_limit);
+
 static struct attribute *mei_attrs[] = {
 	&dev_attr_fw_status.attr,
 	&dev_attr_hbm_ver.attr,
 	&dev_attr_hbm_ver_drv.attr,
+	&dev_attr_tx_queue_limit.attr,
 	NULL
 };
 ATTRIBUTE_GROUPS(mei);

drivers/misc/mei/mei_dev.h

@@ -210,6 +210,7 @@ struct mei_cl_cb {
  * @timer_count:  watchdog timer for operation completion
  * @notify_en: notification - enabled/disabled
  * @notify_ev: pending notification event
+ * @tx_cb_queued: number of tx callbacks in queue
  * @writing_state: state of the tx
  * @rd_pending: pending read credits
  * @rd_completed: completed read
@@ -234,6 +235,7 @@ struct mei_cl {
 	u8 timer_count;
 	u8 notify_en;
 	u8 notify_ev;
+	u8 tx_cb_queued;
 	enum mei_file_transaction_states writing_state;
 	struct list_head rd_pending;
 	struct list_head rd_completed;
@@ -241,6 +243,10 @@ struct mei_cl {
 	struct mei_cl_device *cldev;
 };
 
+#define MEI_TX_QUEUE_LIMIT_DEFAULT 50
+#define MEI_TX_QUEUE_LIMIT_MAX 255
+#define MEI_TX_QUEUE_LIMIT_MIN 30
+
 /**
  * struct mei_hw_ops - hw specific ops
  *
@@ -315,8 +321,6 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length,
 bool mei_cl_bus_rx_event(struct mei_cl *cl);
 bool mei_cl_bus_notify_event(struct mei_cl *cl);
 void mei_cl_bus_remove_devices(struct mei_device *bus);
-bool mei_cl_bus_module_get(struct mei_cl *cl);
-void mei_cl_bus_module_put(struct mei_cl *cl);
 int mei_cl_bus_init(void);
 void mei_cl_bus_exit(void);
 
@@ -361,6 +365,7 @@ const char *mei_pg_state_str(enum mei_pg_state state);
  * @write_waiting_list : write completion list
  * @ctrl_wr_list : pending control write list
  * @ctrl_rd_list : pending control read list
+ * @tx_queue_limit: tx queues per client linit
  *
  * @file_list   : list of opened handles
  * @open_handle_count: number of opened handles
@@ -425,6 +430,7 @@ struct mei_device {
 	struct list_head write_waiting_list;
 	struct list_head ctrl_wr_list;
 	struct list_head ctrl_rd_list;
+	u8 tx_queue_limit;
 
 	struct list_head file_list;
 	long open_handle_count;

drivers/misc/mic/bus/vop_bus.c

@@ -135,7 +135,9 @@ EXPORT_SYMBOL_GPL(vop_unregister_driver);
 
 static void vop_release_dev(struct device *d)
 {
-	put_device(d);
+	struct vop_device *dev = dev_to_vop(d);
+
+	kfree(dev);
 }
 
 struct vop_device *
@@ -174,7 +176,7 @@ vop_register_device(struct device *pdev, int id,
 		goto free_vdev;
 	return vdev;
 free_vdev:
-	kfree(vdev);
+	put_device(&vdev->dev);
 	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(vop_register_device);

drivers/misc/ocxl/pci.c

@@ -519,7 +519,7 @@ static struct ocxl_fn *init_function(struct pci_dev *dev)
 	rc = device_register(&fn->dev);
 	if (rc) {
 		deconfigure_function(fn);
-		device_unregister(&fn->dev);
+		put_device(&fn->dev);
 		return ERR_PTR(rc);
 	}
 	return fn;

drivers/nvmem/Kconfig

@@ -167,10 +167,10 @@ config MESON_MX_EFUSE
 
 config NVMEM_SNVS_LPGPR
 	tristate "Support for Low Power General Purpose Register"
-	depends on SOC_IMX6 || COMPILE_TEST
+	depends on SOC_IMX6 || SOC_IMX7D || COMPILE_TEST
 	help
 	  This is a driver for Low Power General Purpose Register (LPGPR) available on
-	  i.MX6 SoCs in Secure Non-Volatile Storage (SNVS) of this chip.
+	  i.MX6 and i.MX7 SoCs in Secure Non-Volatile Storage (SNVS) of this chip.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called nvmem-snvs-lpgpr.

drivers/nvmem/bcm-ocotp.c

@@ -262,8 +262,7 @@ static int bcm_otpc_probe(struct platform_device *pdev)
 	else if (of_device_is_compatible(dev->of_node, "brcm,ocotp-v2"))
 		priv->map = &otp_map_v2;
 	else {
-		dev_err(&pdev->dev,
-			"%s otpc config map not defined\n", __func__);
+		dev_err(dev, "%s otpc config map not defined\n", __func__);
 		return -EINVAL;
 	}
 
@@ -302,27 +301,17 @@ static int bcm_otpc_probe(struct platform_device *pdev)
 
 	priv->config = &bcm_otpc_nvmem_config;
 
-	nvmem = nvmem_register(&bcm_otpc_nvmem_config);
+	nvmem = devm_nvmem_register(dev, &bcm_otpc_nvmem_config);
 	if (IS_ERR(nvmem)) {
 		dev_err(dev, "error registering nvmem config\n");
 		return PTR_ERR(nvmem);
 	}
 
-	platform_set_drvdata(pdev, nvmem);
-
 	return 0;
 }
 
-static int bcm_otpc_remove(struct platform_device *pdev)
-{
-	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
-
-	return nvmem_unregister(nvmem);
-}
-
 static struct platform_driver bcm_otpc_driver = {
 	.probe	= bcm_otpc_probe,
-	.remove	= bcm_otpc_remove,
 	.driver = {
 		.name	= "brcm-otpc",
 		.of_match_table = bcm_otpc_dt_ids,

drivers/nvmem/core.c

@@ -473,9 +473,14 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	nvmem->reg_read = config->reg_read;
 	nvmem->reg_write = config->reg_write;
 	nvmem->dev.of_node = config->dev->of_node;
-	dev_set_name(&nvmem->dev, "%s%d",
-		     config->name ? : "nvmem",
-		     config->name ? config->id : nvmem->id);
+
+	if (config->id == -1 && config->name) {
+		dev_set_name(&nvmem->dev, "%s", config->name);
+	} else {
+		dev_set_name(&nvmem->dev, "%s%d",
+			     config->name ? : "nvmem",
+			     config->name ? config->id : nvmem->id);
+	}
 
 	nvmem->read_only = device_property_present(config->dev, "read-only") |
 			   config->read_only;
@@ -544,6 +549,65 @@ int nvmem_unregister(struct nvmem_device *nvmem)
 }
 EXPORT_SYMBOL_GPL(nvmem_unregister);
 
+static void devm_nvmem_release(struct device *dev, void *res)
+{
+	WARN_ON(nvmem_unregister(*(struct nvmem_device **)res));
+}
+
+/**
+ * devm_nvmem_register() - Register a managed nvmem device for given
+ * nvmem_config.
+ * Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
+ *
+ * @config: nvmem device configuration with which nvmem device is created.
+ *
+ * Return: Will be an ERR_PTR() on error or a valid pointer to nvmem_device
+ * on success.
+ */
+struct nvmem_device *devm_nvmem_register(struct device *dev,
+					 const struct nvmem_config *config)
+{
+	struct nvmem_device **ptr, *nvmem;
+
+	ptr = devres_alloc(devm_nvmem_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	nvmem = nvmem_register(config);
+
+	if (!IS_ERR(nvmem)) {
+		*ptr = nvmem;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return nvmem;
+}
+EXPORT_SYMBOL_GPL(devm_nvmem_register);
+
+static int devm_nvmem_match(struct device *dev, void *res, void *data)
+{
+	struct nvmem_device **r = res;
+
+	return *r == data;
+}
+
+/**
+ * devm_nvmem_unregister() - Unregister previously registered managed nvmem
+ * device.
+ *
+ * @nvmem: Pointer to previously registered nvmem device.
+ *
+ * Return: Will be an negative on error or a zero on success.
+ */
+int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
+{
+	return devres_release(dev, devm_nvmem_release, devm_nvmem_match, nvmem);
+}
+EXPORT_SYMBOL(devm_nvmem_unregister);
+
+
 static struct nvmem_device *__nvmem_device_get(struct device_node *np,
 					       struct nvmem_cell **cellp,
 					       const char *cell_id)

drivers/nvmem/imx-iim.c

@@ -125,7 +125,7 @@ static int imx_iim_probe(struct platform_device *pdev)
 
 	drvdata = of_id->data;
 
-	iim->clk = devm_clk_get(&pdev->dev, NULL);
+	iim->clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(iim->clk))
 		return PTR_ERR(iim->clk);
 
@@ -138,25 +138,13 @@ static int imx_iim_probe(struct platform_device *pdev)
 	cfg.size = drvdata->nregs;
 	cfg.priv = iim;
 
-	nvmem = nvmem_register(&cfg);
-	if (IS_ERR(nvmem))
-		return PTR_ERR(nvmem);
+	nvmem = devm_nvmem_register(dev, &cfg);
 
-	platform_set_drvdata(pdev, nvmem);
-
-	return 0;
-}
-
-static int imx_iim_remove(struct platform_device *pdev)
-{
-	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
-
-	return nvmem_unregister(nvmem);
+	return PTR_ERR_OR_ZERO(nvmem);
 }
 
 static struct platform_driver imx_iim_driver = {
 	.probe	= imx_iim_probe,
-	.remove	= imx_iim_remove,
 	.driver = {
 		.name	= "imx-iim",
 		.of_match_table = imx_iim_dt_ids,

drivers/nvmem/imx-ocotp.c

@@ -439,7 +439,6 @@ MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids);
 
 static int imx_ocotp_probe(struct platform_device *pdev)
 {
-	const struct of_device_id *of_id;
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	struct ocotp_priv *priv;
@@ -460,32 +459,19 @@ static int imx_ocotp_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->clk))
 		return PTR_ERR(priv->clk);
 
-	of_id = of_match_device(imx_ocotp_dt_ids, dev);
 	priv->params = of_device_get_match_data(&pdev->dev);
 	imx_ocotp_nvmem_config.size = 4 * priv->params->nregs;
 	imx_ocotp_nvmem_config.dev = dev;
 	imx_ocotp_nvmem_config.priv = priv;
 	priv->config = &imx_ocotp_nvmem_config;
-	nvmem = nvmem_register(&imx_ocotp_nvmem_config);
+	nvmem = devm_nvmem_register(dev, &imx_ocotp_nvmem_config);
 
-	if (IS_ERR(nvmem))
-		return PTR_ERR(nvmem);
 
-	platform_set_drvdata(pdev, nvmem);
-
-	return 0;
-}
-
-static int imx_ocotp_remove(struct platform_device *pdev)
-{
-	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
-
-	return nvmem_unregister(nvmem);
+	return PTR_ERR_OR_ZERO(nvmem);
 }
 
 static struct platform_driver imx_ocotp_driver = {
 	.probe	= imx_ocotp_probe,
-	.remove	= imx_ocotp_remove,
 	.driver = {
 		.name	= "imx_ocotp",
 		.of_match_table = imx_ocotp_dt_ids,