Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Fixes and improvements for perf/core:

. Overhaul the tools/ makefiles, gluing them to the top level Makefile, from
  Borislav Petkov.

. Move the UI files from tools/perf/util/ui/ to tools/perf/ui/. Also move
  the GTK+ browser to tools/perf/ui/gtk/, from Namhyung Kim.

. Only fallback to sw cycles counter on ENOENT for the hw cycles, from
  Robert Richter

. Trivial fixes from Robert Richter

. Handle the autogenerated bison/flex files better, from Namhyung and Jiri Olsa.

. Navigate jump instructions in the annotate browser, just press enter or ->,
  still needs support for a jump navigation history, i.e. to go back.

. Search string in the annotate browser: same keys as vim:
     / forward
     n next backward/forward
     ? backward

. Clarify number of events/samples in the report header, from Ashay Rane

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 52 insertions, 1 deletions

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 176fce9cc6b..98679b061b6 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -22,6 +22,7 @@
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
 #include <linux/slab.h>
+#include <linux/kthread.h>
 
 /*
  * INTERFACES between SPI master-side drivers and SPI infrastructure.
@@ -235,6 +236,27 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
  *	the device whose settings are being modified.
  * @transfer: adds a message to the controller's transfer queue.
  * @cleanup: frees controller-specific state
+ * @queued: whether this master is providing an internal message queue
+ * @kworker: thread struct for message pump
+ * @kworker_task: pointer to task for message pump kworker thread
+ * @pump_messages: work struct for scheduling work to the message pump
+ * @queue_lock: spinlock to syncronise access to message queue
+ * @queue: message queue
+ * @cur_msg: the currently in-flight message
+ * @busy: message pump is busy
+ * @running: message pump is running
+ * @rt: whether this queue is set to run as a realtime task
+ * @prepare_transfer_hardware: a message will soon arrive from the queue
+ *	so the subsystem requests the driver to prepare the transfer hardware
+ *	by issuing this call
+ * @transfer_one_message: the subsystem calls the driver to transfer a single
+ *	message while queuing transfers that arrive in the meantime. When the
+ *	driver is finished with this message, it must call
+ *	spi_finalize_current_message() so the subsystem can issue the next
+ *	transfer
+ * @prepare_transfer_hardware: there are currently no more messages on the
+ *	queue so the subsystem notifies the driver that it may relax the
+ *	hardware by issuing this call
  *
  * Each SPI master controller can communicate with one or more @spi_device
  * children.  These make a small bus, sharing MOSI, MISO and SCK signals
@@ -318,6 +340,28 @@ struct spi_master {
 
 	/* called on release() to free memory provided by spi_master */
 	void			(*cleanup)(struct spi_device *spi);
+
+	/*
+	 * These hooks are for drivers that want to use the generic
+	 * master transfer queueing mechanism. If these are used, the
+	 * transfer() function above must NOT be specified by the driver.
+	 * Over time we expect SPI drivers to be phased over to this API.
+	 */
+	bool				queued;
+	struct kthread_worker		kworker;
+	struct task_struct		*kworker_task;
+	struct kthread_work		pump_messages;
+	spinlock_t			queue_lock;
+	struct list_head		queue;
+	struct spi_message		*cur_msg;
+	bool				busy;
+	bool				running;
+	bool				rt;
+
+	int (*prepare_transfer_hardware)(struct spi_master *master);
+	int (*transfer_one_message)(struct spi_master *master,
+				    struct spi_message *mesg);
+	int (*unprepare_transfer_hardware)(struct spi_master *master);
 };
 
 static inline void *spi_master_get_devdata(struct spi_master *master)
@@ -343,6 +387,13 @@ static inline void spi_master_put(struct spi_master *master)
 		put_device(&master->dev);
 }
 
+/* PM calls that need to be issued by the driver */
+extern int spi_master_suspend(struct spi_master *master);
+extern int spi_master_resume(struct spi_master *master);
+
+/* Calls the driver make to interact with the message queue */
+extern struct spi_message *spi_get_next_queued_message(struct spi_master *master);
+extern void spi_finalize_current_message(struct spi_master *master);
 
 /* the spi driver core manages memory for the spi_master classdev */
 extern struct spi_master *
@@ -549,7 +600,7 @@ static inline struct spi_message *spi_message_alloc(unsigned ntrans, gfp_t flags
 			+ ntrans * sizeof(struct spi_transfer),
 			flags);
 	if (m) {
-		int i;
+		unsigned i;
 		struct spi_transfer *t = (struct spi_transfer *)(m + 1);
 
 		INIT_LIST_HEAD(&m->transfers);