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author | Mike Leach <mike.leach@linaro.org> | 2021-11-24 21:00:36 +0100 |
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committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2021-11-26 19:34:07 +0100 |
commit | ede5bab874f535355ccee5514383941b9525c03b (patch) | |
tree | 9273638395eda53757447b2978cd70a938024a10 /samples/coresight | |
parent | coresight: syscfg: Update load API for config loadable modules (diff) | |
download | linux-ede5bab874f535355ccee5514383941b9525c03b.tar.xz linux-ede5bab874f535355ccee5514383941b9525c03b.zip |
coresight: syscfg: Example CoreSight configuration loadable module
An example of creating a loadable module to add CoreSight configurations
into a system.
In the Kernel samples/coresight directory.
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Link: https://lore.kernel.org/r/20211124200038.28662-5-mike.leach@linaro.org
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Diffstat (limited to 'samples/coresight')
-rw-r--r-- | samples/coresight/Makefile | 4 | ||||
-rw-r--r-- | samples/coresight/coresight-cfg-sample.c | 73 |
2 files changed, 77 insertions, 0 deletions
diff --git a/samples/coresight/Makefile b/samples/coresight/Makefile new file mode 100644 index 000000000000..b3fce4af2347 --- /dev/null +++ b/samples/coresight/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only + +obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG) += coresight-cfg-sample.o +ccflags-y += -I$(srctree)/drivers/hwtracing/coresight diff --git a/samples/coresight/coresight-cfg-sample.c b/samples/coresight/coresight-cfg-sample.c new file mode 100644 index 000000000000..25485c80b5e3 --- /dev/null +++ b/samples/coresight/coresight-cfg-sample.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright(C) 2020 Linaro Limited. All rights reserved. + * Author: Mike Leach <mike.leach@linaro.org> + */ + +#include "coresight-config.h" +#include "coresight-syscfg.h" + +/* create an alternate autofdo configuration */ + +/* we will provide 4 sets of preset parameter values */ +#define AFDO2_NR_PRESETS 4 +/* the total number of parameters in used features - strobing has 2 */ +#define AFDO2_NR_PARAM_SUM 2 + +static const char *afdo2_ref_names[] = { + "strobing", +}; + +/* + * set of presets leaves strobing window constant while varying period to allow + * experimentation with mark / space ratios for various workloads + */ +static u64 afdo2_presets[AFDO2_NR_PRESETS][AFDO2_NR_PARAM_SUM] = { + { 1000, 100 }, + { 1000, 1000 }, + { 1000, 5000 }, + { 1000, 10000 }, +}; + +struct cscfg_config_desc afdo2 = { + .name = "autofdo2", + .description = "Setup ETMs with strobing for autofdo\n" + "Supplied presets allow experimentation with mark-space ratio for various loads\n", + .nr_feat_refs = ARRAY_SIZE(afdo2_ref_names), + .feat_ref_names = afdo2_ref_names, + .nr_presets = AFDO2_NR_PRESETS, + .nr_total_params = AFDO2_NR_PARAM_SUM, + .presets = &afdo2_presets[0][0], +}; + +static struct cscfg_feature_desc *sample_feats[] = { + NULL +}; + +static struct cscfg_config_desc *sample_cfgs[] = { + &afdo2, + NULL +}; + +static struct cscfg_load_owner_info mod_owner = { + .type = CSCFG_OWNER_MODULE, + .owner_handle = THIS_MODULE, +}; + +/* module init and exit - just load and unload configs */ +static int __init cscfg_sample_init(void) +{ + return cscfg_load_config_sets(sample_cfgs, sample_feats, &mod_owner); +} + +static void __exit cscfg_sample_exit(void) +{ + cscfg_unload_config_sets(&mod_owner); +} + +module_init(cscfg_sample_init); +module_exit(cscfg_sample_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Mike Leach <mike.leach@linaro.org>"); +MODULE_DESCRIPTION("CoreSight Syscfg Example"); |