Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754349AbbHEXCb (ORCPT ); Wed, 5 Aug 2015 19:02:31 -0400 Received: from mail-ob0-f179.google.com ([209.85.214.179]:34288 "EHLO mail-ob0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751503AbbHEXC3 (ORCPT ); Wed, 5 Aug 2015 19:02:29 -0400 MIME-Version: 1.0 In-Reply-To: <1436177344-16751-4-git-send-email-alexander.shishkin@linux.intel.com> References: <1436177344-16751-1-git-send-email-alexander.shishkin@linux.intel.com> <1436177344-16751-4-git-send-email-alexander.shishkin@linux.intel.com> Date: Wed, 5 Aug 2015 17:02:29 -0600 Message-ID: Subject: Re: [PATCH v3 03/11] stm class: dummy_stm: Add dummy driver for testing stm class From: Mathieu Poirier To: Alexander Shishkin Cc: Greg Kroah-Hartman , "linux-kernel@vger.kernel.org" , peter.lachner@intel.com, norbert.schulz@intel.com, keven.boell@intel.com, yann.fouassier@intel.com, laurent.fert@intel.com Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4285 Lines: 122 On 6 July 2015 at 04:08, Alexander Shishkin wrote: > This is a simple module that pretends to be an stm device and discards > all the data that comes in. Useful for testing stm class and its users. > > Cc: Mathieu Poirier > Signed-off-by: Alexander Shishkin > --- > drivers/hwtracing/stm/Kconfig | 8 +++++ > drivers/hwtracing/stm/Makefile | 2 ++ > drivers/hwtracing/stm/dummy_stm.c | 66 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 76 insertions(+) > create mode 100644 drivers/hwtracing/stm/dummy_stm.c > > diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig > index 90ed327461..4fdb8f46d2 100644 > --- a/drivers/hwtracing/stm/Kconfig > +++ b/drivers/hwtracing/stm/Kconfig > @@ -6,3 +6,11 @@ config STM > Examples of such devices are Intel Trace Hub and Coresight STM. > > Say Y here to enable System Trace Module device support. > + > +config STM_DUMMY > + tristate "Dummy STM driver" > + help > + This is a simple dummy device that pretends to be an stm device > + and discards your data. Use for stm class testing. > + > + If you don't know what this is, say N. > diff --git a/drivers/hwtracing/stm/Makefile b/drivers/hwtracing/stm/Makefile > index adec701649..1b2725fd04 100644 > --- a/drivers/hwtracing/stm/Makefile > +++ b/drivers/hwtracing/stm/Makefile > @@ -1,3 +1,5 @@ > obj-$(CONFIG_STM) += stm_core.o > > stm_core-y := core.o policy.o > + > +obj-$(CONFIG_STM_DUMMY) += dummy_stm.o > diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c > new file mode 100644 > index 0000000000..3709bef0b2 > --- /dev/null > +++ b/drivers/hwtracing/stm/dummy_stm.c > @@ -0,0 +1,66 @@ > +/* > + * 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. > + */ > + > +#undef DEBUG > +#include > +#include > +#include > +#include > + > +static ssize_t > +dummy_stm_packet(struct stm_data *stm_data, unsigned int master, > + unsigned int channel, unsigned int packet, unsigned int flags, > + unsigned int size, const unsigned char *payload) > +{ > +#ifdef DEBUG > + u64 pl = 0; > + > + if (payload) > + pl = *(u64 *)payload; > + > + if (size < 8) > + pl &= (1ull << (size * 8)) - 1; > + trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel, > + packet, size, pl); > +#endif > + return size; > +} > + > +static struct stm_data dummy_stm = { > + .name = "dummy_stm", > + .sw_start = 0x0000, > + .sw_end = 0xffff, > + .sw_nchannels = 0xffff, > + .packet = dummy_stm_packet, > +}; > + > +static int dummy_stm_init(void) > +{ > + return stm_register_device(NULL, &dummy_stm, THIS_MODULE); > +} > + > +static void dummy_stm_exit(void) > +{ > + stm_unregister_device(&dummy_stm); > +} > + > +module_init(dummy_stm_init); > +module_exit(dummy_stm_exit); > + > +MODULE_LICENSE("GPL v2"); > +MODULE_DESCRIPTION("dummy_stm device"); > +MODULE_AUTHOR("Alexander Shishkin "); > -- > 2.1.4 > Reviewed-by: Mathieu Poirier -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/