Hi Mathieu,
On Tue, 13 Oct 2020 at 22:24, Mathieu Poirier mathieu.poirier@linaro.org wrote:
On Thu, Aug 27, 2020 at 03:34:11PM +0100, Mike Leach wrote:
Preload set of configurations.
A better description is needed here.
Signed-off-by: Mike Leach mike.leach@linaro.org
drivers/hwtracing/coresight/Makefile | 3 +- .../coresight/coresight-cfg-preload.c | 165 ++++++++++++++++++ drivers/hwtracing/coresight/coresight-core.c | 7 + .../hwtracing/coresight/coresight-syscfg.h | 1 + 4 files changed, 175 insertions(+), 1 deletion(-) create mode 100644 drivers/hwtracing/coresight/coresight-cfg-preload.c
diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index 5723094b2b69..8914be6b254c 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -4,7 +4,8 @@ # obj-$(CONFIG_CORESIGHT) += coresight.o coresight-y := coresight-core.o coresight-etm-perf.o coresight-platform.o \
coresight-sysfs.o coresight-syscfg.o coresight-config.o
coresight-sysfs.o coresight-syscfg.o coresight-config.o \coresight-cfg-preload.oobj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \ coresight-tmc-etr.o diff --git a/drivers/hwtracing/coresight/coresight-cfg-preload.c b/drivers/hwtracing/coresight/coresight-cfg-preload.c new file mode 100644 index 000000000000..77b477b868d0 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-cfg-preload.c @@ -0,0 +1,165 @@ +// 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" +#include "coresight-etm4x-cfg.h"
+/* preload configurations and features */
+/* preload in features for ETMv4 */
+/* strobe feature */
+/* register defines */ +#define STRB_REG_CTR (CS_CFG_REG_RESOURCE | ETM4_CFG_RES_CTR) +#define STRB_REG_CTR_RB (STRB_REG_CTR | CS_CFG_REG_VAL_SAVE) +#define STRB_REG_CTR_PRM (STRB_REG_CTR | CS_CFG_REG_VAL_PARAM) +#define STRB_REG_SEQ (CS_CFG_REG_RESOURCE | ETM4_CFG_RES_SEQ) +#define STRB_REG_SEL (CS_CFG_REG_RESOURCE | ETM4_CFG_RES_SEL) +#define STRB_REG_VI (CS_CFG_REG_STD | CS_CFG_REG_VAL_MASK)
+static struct cs_cfg_parameter_desc strobe_params[] = {
{.name = "window",.value = 5000,},{.name = "period",.value = 10000,Why do parameters have an initial value? Isn't that what presets are for? To me it seems like there is three ways to have initial values: parameters, register descriptors and presets. Going down to a single one, probably presets, would make things more simple.
parameters, presets and register values have 3 distinct and different jobs. 1) registers - straight up write this register with the value I told you. 2) parameters - these values get loaded into a register when a feature is enabled on a device instance. The value can be what the user set it to, or if they do not set it, then the value that is declared in the initial descriptor is used. The key here is that the register declaration - i.e. the register the parameter is copied into, uses a form where the value is the index of the parameter. hence the parameter most have the real value used. 3) presets - these are easily selectable setys of parameter values for a configuration initiated from the perf command line. So will override the default / current user selected value for a given trace run.
The v3 set contains the initial draft of some documentation so hopefully the concepts will be easier to follow.
I am done reviewing this set.
Thanks for the review. Appreciate it was quite a large set to look at.
Regards
Mike
Thanks for the patience, Mathieu
},{ 0 },+};
+static struct cs_cfg_reg_desc strobe_regs[] = {
/* resource selectors */{.flags = STRB_REG_SEL | TRCRSCTLRn(2),.value = {.val32 = 0x20001,},},{.flags = STRB_REG_SEQ | TRCRSCTLRn(3),.value = {.val32 = 0x20002,}},/* strobe window counter 0 - reload from param 0 */{.flags = STRB_REG_CTR_RB | TRCCNTVRn(0),},{.flags = STRB_REG_CTR_PRM | TRCCNTRLDVRn(0),.value = {.val32 = 0,},},{.flags = STRB_REG_CTR | TRCCNTCTLRn(0),.value = {.val32 = 0x10001,},},/* strobe period counter 1 - reload from param 1 */{.flags = STRB_REG_CTR_RB | TRCCNTVRn(1),},{.flags = STRB_REG_CTR_PRM | TRCCNTRLDVRn(1),.value = {.val32 = 1,},},{.flags = STRB_REG_CTR | TRCCNTCTLRn(1),.value = {.val32 = 0x8102,},},/* sequencer */{.flags = STRB_REG_SEQ | TRCSEQEVRn(0),.value = {.val32 = 0x0081,},},{.flags = STRB_REG_SEQ | TRCSEQEVRn(1),.value = {.val32 = 0x0000,},},/* view-inst */{.flags = STRB_REG_VI | TRCVICTLR,.value = {.val32 = 0x0003,.mask32 = 0x0003,},},/* end of regs */{ 0 },+};
+static struct cs_cfg_feature_desc strobe = {
.name = "strobing",.brief = "Generate periodic trace capture windows.",.match_flags = CS_CFG_MATCH_CLASS_SRC_ETM4,.params = strobe_params,.regs = strobe_regs,+};
+static struct cs_cfg_feature_desc *preload_feats[] = {
&strobe,0+};
+/* create an autofdo configuration */
+/* we will provide 2 sets of preset parameter values */ +#define AFDO_NR_PRESETS 2 +/* the total number of parameters in used features */ +#define AFDO_NR_PARAM_SUM 2
+#define AFDO_MATCH_STROBING (CS_CFG_MATCH_INST_ANY | CS_CFG_MATCH_CLASS_SRC_ETM4)
+static struct cs_cfg_uses_feat_desc afdo_uses[] = {
{.name = "strobing",.nr_params = 2,.match = {.flags = AFDO_MATCH_STROBING,},},+};
+static u64 afdo_presets[AFDO_NR_PRESETS][AFDO_NR_PARAM_SUM] = {
{ 10000, 5000 },{ 5000, 5000 },+};
+static struct cs_cfg_config_desc afdo = {
.name = "autofdo",.brief = "Setup ETMs with strobing for autofdo",.nr_uses = sizeof(afdo_uses) / sizeof(struct cs_cfg_uses_feat_desc),.uses = afdo_uses,.nr_presets = AFDO_NR_PRESETS,.nr_total_params = AFDO_NR_PARAM_SUM,.presets = &afdo_presets[0][0],+};
+static struct cs_cfg_config_desc *preload_cfgs[] = {
&afdo,0+};
+/* preload called with mutex locked */ +int cscfg_preload(void) +{
return cscfg_load_config_sets(preload_cfgs, preload_feats);+} diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index 91f1fbd7d51d..7158d5a46b93 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -1701,9 +1701,16 @@ static int __init coresight_init(void) goto exit_perf_clear;
ret = cscfg_create_device();
if (ret)goto exit_cscfg_driver;/* preload builtin configurations */ret = cscfg_preload(); if (!ret) return 0;cscfg_clear_device();+exit_cscfg_driver: cscfg_driver_exit(); exit_perf_clear: etm_perf_exit(); diff --git a/drivers/hwtracing/coresight/coresight-syscfg.h b/drivers/hwtracing/coresight/coresight-syscfg.h index 30dc12a7ecaa..b3a1c246dd33 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.h +++ b/drivers/hwtracing/coresight/coresight-syscfg.h @@ -77,6 +77,7 @@ int cscfg_create_device(void); void cscfg_clear_device(void); int __init cscfg_driver_init(void); void cscfg_driver_exit(void); +int cscfg_preload(void);
/* syscfg external API */ int cscfg_load_config_sets(struct cs_cfg_config_desc **cfg_descs, -- 2.17.1