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Message-ID: <2c920dda-fdd3-436a-85cc-ead018f28ee4@arm.com>
Date: Fri, 12 Jan 2024 14:04:25 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Linu Cherian <lcherian@...vell.com>, mike.leach@...aro.org,
james.clark@....com, leo.yan@...aro.org
Cc: linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
linux-kernel@...r.kernel.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
devicetree@...r.kernel.org, sgoutham@...vell.com, gcherian@...vell.com
Subject: Re: [PATCH v6 7/7] coresight: config: Add preloaded configuration
On 05/01/2024 05:58, Linu Cherian wrote:
> Add a preloaded configuration for generating
> external trigger on address match. This can be
> used by CTI and ETR blocks to stop trace capture
> on kernel panic.
>
> Kernel address for panic function to be
> programmed as below.
>
> $cd /config/cs-syscfg/features/gen_etrig/params
> $echo <panic_address> > address/value
>
> Signed-off-by: Linu Cherian <lcherian@...vell.com>
> ---
> Changelog from v5:
> * No changes
>
> drivers/hwtracing/coresight/Makefile | 2 +-
> .../coresight/coresight-cfg-preload.c | 2 +
> .../coresight/coresight-cfg-preload.h | 2 +
> .../hwtracing/coresight/coresight-cfg-pstop.c | 83 +++++++++++++++++++
> 4 files changed, 88 insertions(+), 1 deletion(-)
> create mode 100644 drivers/hwtracing/coresight/coresight-cfg-pstop.c
>
> diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
> index 995d3b2c76df..68b15c8d9462 100644
> --- a/drivers/hwtracing/coresight/Makefile
> +++ b/drivers/hwtracing/coresight/Makefile
> @@ -5,7 +5,7 @@
> obj-$(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-cfg-preload.o coresight-cfg-afdo.o \
> + coresight-cfg-preload.o coresight-cfg-afdo.o coresight-cfg-pstop.o \
> coresight-syscfg-configfs.o coresight-trace-id.o
> obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o
> coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \
> diff --git a/drivers/hwtracing/coresight/coresight-cfg-preload.c b/drivers/hwtracing/coresight/coresight-cfg-preload.c
> index e237a4edfa09..4980e68483c5 100644
> --- a/drivers/hwtracing/coresight/coresight-cfg-preload.c
> +++ b/drivers/hwtracing/coresight/coresight-cfg-preload.c
> @@ -13,6 +13,7 @@
> static struct cscfg_feature_desc *preload_feats[] = {
> #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
> &strobe_etm4x,
> + &gen_etrig_etm4x,
> #endif
> NULL
> };
> @@ -20,6 +21,7 @@ static struct cscfg_feature_desc *preload_feats[] = {
> static struct cscfg_config_desc *preload_cfgs[] = {
> #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
> &afdo_etm4x,
> + &pstop_etm4x,
> #endif
> NULL
> };
> diff --git a/drivers/hwtracing/coresight/coresight-cfg-preload.h b/drivers/hwtracing/coresight/coresight-cfg-preload.h
> index 21299e175477..291ba530a6a5 100644
> --- a/drivers/hwtracing/coresight/coresight-cfg-preload.h
> +++ b/drivers/hwtracing/coresight/coresight-cfg-preload.h
> @@ -10,4 +10,6 @@
> #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
> extern struct cscfg_feature_desc strobe_etm4x;
> extern struct cscfg_config_desc afdo_etm4x;
> +extern struct cscfg_feature_desc gen_etrig_etm4x;
> +extern struct cscfg_config_desc pstop_etm4x;
> #endif
> diff --git a/drivers/hwtracing/coresight/coresight-cfg-pstop.c b/drivers/hwtracing/coresight/coresight-cfg-pstop.c
> new file mode 100644
> index 000000000000..037d6773fab8
> --- /dev/null
> +++ b/drivers/hwtracing/coresight/coresight-cfg-pstop.c
> @@ -0,0 +1,83 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright(C) 2023 Marvell.
> + * Based on coresight-cfg-afdo.c
> + */
> +
> +#include "coresight-config.h"
> +
> +/* ETMv4 includes and features */
> +#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
> +#include "coresight-etm4x-cfg.h"
> +
> +/* preload configurations and features */
> +
> +/* preload in features for ETMv4 */
> +
> +/* panic_stop feature */
> +static struct cscfg_parameter_desc gen_etrig_params[] = {
> + {
> + .name = "address",
> + .value = 0x0,
> + },
> +};
> +
> +static struct cscfg_regval_desc gen_etrig_regs[] = {
> + /* resource selector */
> + {
> + .type = CS_CFG_REG_TYPE_RESOURCE,
> + .offset = TRCRSCTLRn(2),
> + .hw_info = ETM4_CFG_RES_SEL,
> + .val32 = 0x40001,
> + },
> + /* single address comparator */
> + {
> + .type = CS_CFG_REG_TYPE_RESOURCE | CS_CFG_REG_TYPE_VAL_64BIT |
> + CS_CFG_REG_TYPE_VAL_PARAM,
> + .offset = TRCACVRn(0),
> + .val32 = 0x0,
> + },
> + {
> + .type = CS_CFG_REG_TYPE_RESOURCE,
> + .offset = TRCACATRn(0),
> + .val64 = 0xf00,
> + },
> + /* Driver external output[0] with comparator out */
> + {
> + .type = CS_CFG_REG_TYPE_RESOURCE,
> + .offset = TRCEVENTCTL0R,
> + .val32 = 0x2,
> + },
> + /* end of regs */
> +};
> +
> +struct cscfg_feature_desc gen_etrig_etm4x = {
> + .name = "gen_etrig",
> + .description = "Generate external trigger on address match\n"
> + "parameter \'address\': address of kernel address\n",
> + .match_flags = CS_CFG_MATCH_CLASS_SRC_ETM4,
> + .nr_params = ARRAY_SIZE(gen_etrig_params),
> + .params_desc = gen_etrig_params,
> + .nr_regs = ARRAY_SIZE(gen_etrig_regs),
> + .regs_desc = gen_etrig_regs,
> +};
> +
> +/* create a panic stop configuration */
> +
> +/* the total number of parameters in used features */
> +#define PSTOP_NR_PARAMS ARRAY_SIZE(gen_etrig_params)
> +
> +static const char *pstop_ref_names[] = {
> + "gen_etrig",
> +};
> +
> +struct cscfg_config_desc pstop_etm4x = {
> + .name = "panicstop",
> + .description = "Stop ETM on kernel panic\n",
Since this is actually generic, i.e., Stop trace on a Kernel address, we
could rename this ? Or why don't we pre-populate the address of "panic"
at load time. That way the user doesn't have to figure out the kernel
address (e.g., if KASLR is enabled)
Suzuki
> + .nr_feat_refs = ARRAY_SIZE(pstop_ref_names),
> + .feat_ref_names = pstop_ref_names,
> + .nr_total_params = PSTOP_NR_PARAMS,
> +};
> +
> +/* end of ETM4x configurations */
> +#endif /* IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X) */
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