On 6 July 2015 at 04:08, Alexander Shishkin <[email protected]> wrote: > This is a simple stm_source class device driver (kernelspace stm trace > source) that registers a console and sends kernel messages over STM > devices. > > Cc: Mathieu Poirier <[email protected]> > Signed-off-by: Alexander Shishkin <[email protected]> > --- > drivers/hwtracing/stm/Kconfig | 9 +++++ > drivers/hwtracing/stm/Makefile | 4 +++ > drivers/hwtracing/stm/console.c | 80 > +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 93 insertions(+) > create mode 100644 drivers/hwtracing/stm/console.c > > diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig > index 4fdb8f46d2..583c222218 100644 > --- a/drivers/hwtracing/stm/Kconfig > +++ b/drivers/hwtracing/stm/Kconfig > @@ -14,3 +14,12 @@ config STM_DUMMY > and discards your data. Use for stm class testing. > > If you don't know what this is, say N. > + > +config STM_SOURCE_CONSOLE > + tristate "Kernel console over STM devices" > + help > + This is a kernel space trace source that sends kernel log > + messages to trace hosts over STM devices. > + > + If you want to send kernel console messages over STM devices, > + say Y. > diff --git a/drivers/hwtracing/stm/Makefile b/drivers/hwtracing/stm/Makefile > index 1b2725fd04..f9312c38dd 100644 > --- a/drivers/hwtracing/stm/Makefile > +++ b/drivers/hwtracing/stm/Makefile > @@ -3,3 +3,7 @@ obj-$(CONFIG_STM) += stm_core.o > stm_core-y := core.o policy.o > > obj-$(CONFIG_STM_DUMMY) += dummy_stm.o > + > +obj-$(CONFIG_STM_SOURCE_CONSOLE) += stm_console.o > + > +stm_console-y := console.o > diff --git a/drivers/hwtracing/stm/console.c b/drivers/hwtracing/stm/console.c > new file mode 100644 > index 0000000000..c9d9a8d2ff > --- /dev/null > +++ b/drivers/hwtracing/stm/console.c > @@ -0,0 +1,80 @@ > +/* > + * 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. > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/console.h> > +#include <linux/slab.h> > +#include <linux/stm.h> > + > +static int stm_console_link(struct stm_source_data *data); > +static void stm_console_unlink(struct stm_source_data *data); > + > +static struct stm_console { > + struct stm_source_data data; > + struct console console; > +} stm_console = { > + .data = { > + .name = "console", > + .nr_chans = 1, > + .link = stm_console_link, > + .unlink = stm_console_unlink, > + }, > +}; > + > +static void > +stm_console_write(struct console *con, const char *buf, unsigned len) > +{ > + struct stm_console *sc = container_of(con, struct stm_console, > console); > + > + stm_source_write(&sc->data, 0, buf, len); > +} > + > +static int stm_console_link(struct stm_source_data *data) > +{ > + struct stm_console *sc = container_of(data, struct stm_console, data); > + > + strcpy(sc->console.name, "stm_console"); > + sc->console.write = stm_console_write; > + sc->console.flags = CON_ENABLED | CON_PRINTBUFFER; > + register_console(&sc->console); > + > + return 0; > +} > + > +static void stm_console_unlink(struct stm_source_data *data) > +{ > + struct stm_console *sc = container_of(data, struct stm_console, data); > + > + unregister_console(&sc->console); > +} > + > +static int stm_console_init(void) > +{ > + return stm_source_register_device(NULL, &stm_console.data); > +} > + > +static void stm_console_exit(void) > +{ > + stm_source_unregister_device(&stm_console.data); > +} > + > +module_init(stm_console_init); > +module_exit(stm_console_exit); > + > +MODULE_LICENSE("GPL v2"); > +MODULE_DESCRIPTION("stm_console driver"); > +MODULE_AUTHOR("Alexander Shishkin <[email protected]>"); > -- > 2.1.4 >
Reviewed-by: Mathieu Poirier <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
