linux-kernel - Re: [PATCH v7 03/28] coresight: Introduce device access abstraction

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Date:   Mon, 25 Jan 2021 11:42:49 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        anshuman.khandual@....com, mike.leach@...aro.org,
        leo.yan@...aro.org, linux-kernel@...r.kernel.org,
        jonathan.zhouwen@...wei.com, catalin.marinas@....com
Subject: Re: [PATCH v7 03/28] coresight: Introduce device access abstraction

On Sun, Jan 10, 2021 at 10:48:25PM +0000, Suzuki K Poulose wrote:
> We are about to introduce support for sysreg access to ETMv4.4+
> component. Since there are generic routines that access the
> registers (e.g, CS_LOCK/UNLOCK , claim/disclaim operations, timeout)
> and in order to preserve the logic of these operations at a
> single place we introduce an abstraction layer for the accesses
> to a given device.
> 
> Cc: Mike Leach <mike.leach@...aro.org>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
> Change since v6:
>  - Fix code indentation in coresight.h (Mathieu Poirier)
> Change since v3
>  - Dropped csa argument to read()/write().
>  - Addressed comments on spacing and adding labels for the #if #else #endifs.
>    (Mathieu)
> ---
>  drivers/hwtracing/coresight/coresight-catu.c  |   1 +
>  drivers/hwtracing/coresight/coresight-core.c  |  43 ++++
>  .../hwtracing/coresight/coresight-cti-core.c  |   1 +
>  drivers/hwtracing/coresight/coresight-etb10.c |   1 +
>  .../coresight/coresight-etm3x-core.c          |   1 +
>  .../coresight/coresight-etm4x-core.c          |   1 +
>  .../hwtracing/coresight/coresight-funnel.c    |   1 +
>  .../coresight/coresight-replicator.c          |   1 +
>  drivers/hwtracing/coresight/coresight-stm.c   |   1 +
>  .../hwtracing/coresight/coresight-tmc-core.c  |   1 +
>  drivers/hwtracing/coresight/coresight-tpiu.c  |   1 +
>  include/linux/coresight.h                     | 193 +++++++++++++++++-
>  12 files changed, 243 insertions(+), 3 deletions(-)

[...]

> +u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset);
> +u32 coresight_read32(struct coresight_device *csdev, u32 offset);
> +void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset);
> +void coresight_relaxed_write32(struct coresight_device *csdev,
> +			       u32 val,
> +			       u32 offset);

More stacking - I fixed it.

> +u64 coresight_relaxed_read64(struct coresight_device *csdev, u32 offset);
> +u64 coresight_read64(struct coresight_device *csdev, u32 offset);
> +void coresight_relaxed_write64(struct coresight_device *csdev,
> +			       u64 val, u32 offset);
> +void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset);
> +
> +
>  #else
>  static inline struct coresight_device *
>  coresight_register(struct coresight_desc *desc) { return NULL; }
> @@ -369,10 +512,54 @@ static inline bool coresight_loses_context_with_cpu(struct device *dev)
>  {
>  	return false;
>  }
> -#endif
> +
> +static inline u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset)
> +{
> +	WARN_ON_ONCE(1);
> +	return 0;
> +}
> +
> +static inline u32 coresight_read32(struct coresight_device *csdev, u32 offset)
> +{
> +	WARN_ON_ONCE(1);
> +	return 0;
> +}
> +
> +static inline void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset)
> +{
> +}
> +
> +static inline void coresight_relaxed_write32(struct coresight_device *csdev,
> +					     u32 val, u32 offset)
> +{
> +}
> +
> +static inline u64 coresight_relaxed_read64(struct coresight_device *csdev,
> +					   u32 offset)
> +{
> +	WARN_ON_ONCE(1);
> +	return 0;
> +}
> +
> +static inline u64 coresight_read64(struct coresight_device *csdev, u32 offset)
> +{
> +	WARN_ON_ONCE(1);
> +	return 0;
> +}
> +
> +static inline void coresight_relaxed_write64(struct coresight_device *csdev,
> +					     u64 val, u32 offset)
> +{
> +}
> +
> +static inline void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
> +{
> +}
> +
> +#endif		/* IS_ENABLED(CONFIG_CORESIGHT) */
>  
>  extern int coresight_get_cpu(struct device *dev);
>  
>  struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
>  
> -#endif
> +#endif		/* _LINUX_COREISGHT_H */
> -- 
> 2.24.1
>