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| author |   Qi Liu <liuqi115@huawei.com> | 2020-12-08 11:26:51 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-08 19:57:19 +0100 |
| commit | e72550928ff052ca721777875bd23a7abf3efb13 (patch) | |
| tree | 7314c69da27fac6dc853e58cc2de9f67e8b750cb /drivers/hwtracing/coresight/coresight-etm4x.h | |
| parent | coresight: remove broken __exit annotations (diff) | |
| download | linux-dev-e72550928ff052ca721777875bd23a7abf3efb13.tar.xz linux-dev-e72550928ff052ca721777875bd23a7abf3efb13.zip | |
coresight: etm4x: Modify core-commit to avoid HiSilicon ETM overflow
The ETM device can't keep up with the core pipeline when cpu core
is at full speed. This may cause overflow within core and its ETM.
This is a common phenomenon on ETM devices.
On HiSilicon Hip08 platform, a specific feature is added to set
core pipeline. So commit rate can be reduced manually to avoid ETM
overflow.
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Qi Liu <liuqi115@huawei.com>
[Modified changelog title and Kconfig description]
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20201208182651.1597945-4-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etm4x.h')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index eefc7371c6c4..3dd3e0633328 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -8,6 +8,7 @@ #include <asm/local.h> #include <linux/spinlock.h> +#include <linux/types.h> #include "coresight-priv.h" /* @@ -203,6 +204,11 @@ /* Interpretation of resource numbers change at ETM v4.3 architecture */ #define ETM4X_ARCH_4V3 0x43 +enum etm_impdef_type { + ETM4_IMPDEF_HISI_CORE_COMMIT, + ETM4_IMPDEF_FEATURE_MAX, +}; + /** * struct etmv4_config - configuration information related to an ETMv4 * @mode: Controls various modes supported by this ETM. @@ -415,6 +421,7 @@ struct etmv4_save_state { * @state_needs_restore: True when there is context to restore after PM exit * @skip_power_up: Indicates if an implementation can skip powering up * the trace unit. + * @arch_features: Bitmap of arch features of etmv4 devices. */ struct etmv4_drvdata { void __iomem *base; @@ -463,6 +470,7 @@ struct etmv4_drvdata { struct etmv4_save_state *save_state; bool state_needs_restore; bool skip_power_up; + DECLARE_BITMAP(arch_features, ETM4_IMPDEF_FEATURE_MAX); }; /* Address comparator access types */ |