[PATCH v2] coresight: Use local coresight_desc instances

Mathieu Poirier mathieu.poirier at linaro.org
Thu Jul 14 12:37:20 PDT 2016


On 13 July 2016 at 10:40, Suzuki K Poulose <suzuki.poulose at arm.com> wrote:
> Each coresight device prepares a description for coresight_register()
> in struct coresight_desc. Once we register the device, the description is
> useless and can be freed. The coresight_desc is small enough (48bytes on
> 64bit)i to be allocated on the stack. Hence use an automatic variable to
> avoid a needless dynamic allocation and wasting the memory(which will only
> be free'd when the device is destroyed).
>
> Cc: Mathieu Poirier <mathieu.poirier at linaro.org>
> Cc: Pratik Patel <pratikp at codeaurora.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
> ---
> Changes since V1:
>   - Fix build errors in replicator-qcom
> ---
>  drivers/hwtracing/coresight/coresight-etb10.c      | 20 ++++++--------
>  drivers/hwtracing/coresight/coresight-etm3x.c      | 20 ++++++--------
>  drivers/hwtracing/coresight/coresight-etm4x.c      | 20 ++++++--------
>  drivers/hwtracing/coresight/coresight-funnel.c     | 20 ++++++--------
>  .../coresight/coresight-replicator-qcom.c          | 18 +++++--------
>  drivers/hwtracing/coresight/coresight-replicator.c | 20 +++++---------
>  drivers/hwtracing/coresight/coresight-stm.c        | 22 ++++++---------
>  drivers/hwtracing/coresight/coresight-tmc.c        | 31 ++++++++++------------
>  drivers/hwtracing/coresight/coresight-tpiu.c       | 18 +++++--------
>  9 files changed, 75 insertions(+), 114 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index 3b483e3..8a4927c 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -636,7 +636,7 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
>         struct coresight_platform_data *pdata = NULL;
>         struct etb_drvdata *drvdata;
>         struct resource *res = &adev->res;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = adev->dev.of_node;
>
>         if (np) {
> @@ -682,17 +682,13 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
>                 return -ENOMEM;
>         }
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc)
> -               return -ENOMEM;
> -
> -       desc->type = CORESIGHT_DEV_TYPE_SINK;
> -       desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
> -       desc->ops = &etb_cs_ops;
> -       desc->pdata = pdata;
> -       desc->dev = dev;
> -       desc->groups = coresight_etb_groups;
> -       drvdata->csdev = coresight_register(desc);
> +       desc.type = CORESIGHT_DEV_TYPE_SINK;
> +       desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
> +       desc.ops = &etb_cs_ops;
> +       desc.pdata = pdata;
> +       desc.dev = dev;
> +       desc.groups = coresight_etb_groups;
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev))
>                 return PTR_ERR(drvdata->csdev);
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
> index d83ab82..beaaa2c 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
> @@ -758,13 +758,9 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
>         struct coresight_platform_data *pdata = NULL;
>         struct etm_drvdata *drvdata;
>         struct resource *res = &adev->res;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = adev->dev.of_node;
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc)
> -               return -ENOMEM;
> -
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata)
>                 return -ENOMEM;
> @@ -819,13 +815,13 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
>         etm_init_trace_id(drvdata);
>         etm_set_default(&drvdata->config);
>
> -       desc->type = CORESIGHT_DEV_TYPE_SOURCE;
> -       desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
> -       desc->ops = &etm_cs_ops;
> -       desc->pdata = pdata;
> -       desc->dev = dev;
> -       desc->groups = coresight_etm_groups;
> -       drvdata->csdev = coresight_register(desc);
> +       desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> +       desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
> +       desc.ops = &etm_cs_ops;
> +       desc.pdata = pdata;
> +       desc.dev = dev;
> +       desc.groups = coresight_etm_groups;
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
>                 ret = PTR_ERR(drvdata->csdev);
>                 goto err_arch_supported;
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index c8b44c6..2c21b1d 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -726,13 +726,9 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>         struct coresight_platform_data *pdata = NULL;
>         struct etmv4_drvdata *drvdata;
>         struct resource *res = &adev->res;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = adev->dev.of_node;
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc)
> -               return -ENOMEM;
> -
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata)
>                 return -ENOMEM;
> @@ -778,13 +774,13 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>         etm4_init_trace_id(drvdata);
>         etm4_set_default(&drvdata->config);
>
> -       desc->type = CORESIGHT_DEV_TYPE_SOURCE;
> -       desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
> -       desc->ops = &etm4_cs_ops;
> -       desc->pdata = pdata;
> -       desc->dev = dev;
> -       desc->groups = coresight_etmv4_groups;
> -       drvdata->csdev = coresight_register(desc);
> +       desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> +       desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
> +       desc.ops = &etm4_cs_ops;
> +       desc.pdata = pdata;
> +       desc.dev = dev;
> +       desc.groups = coresight_etmv4_groups;
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
>                 ret = PTR_ERR(drvdata->csdev);
>                 goto err_arch_supported;
> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
> index 05df789..860fe6e 100644
> --- a/drivers/hwtracing/coresight/coresight-funnel.c
> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
> @@ -176,7 +176,7 @@ static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
>         struct coresight_platform_data *pdata = NULL;
>         struct funnel_drvdata *drvdata;
>         struct resource *res = &adev->res;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = adev->dev.of_node;
>
>         if (np) {
> @@ -207,17 +207,13 @@ static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
>         drvdata->base = base;
>         pm_runtime_put(&adev->dev);
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc)
> -               return -ENOMEM;
> -
> -       desc->type = CORESIGHT_DEV_TYPE_LINK;
> -       desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
> -       desc->ops = &funnel_cs_ops;
> -       desc->pdata = pdata;
> -       desc->dev = dev;
> -       desc->groups = coresight_funnel_groups;
> -       drvdata->csdev = coresight_register(desc);
> +       desc.type = CORESIGHT_DEV_TYPE_LINK;
> +       desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
> +       desc.ops = &funnel_cs_ops;
> +       desc.pdata = pdata;
> +       desc.dev = dev;
> +       desc.groups = coresight_funnel_groups;
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev))
>                 return PTR_ERR(drvdata->csdev);
>
> diff --git a/drivers/hwtracing/coresight/coresight-replicator-qcom.c b/drivers/hwtracing/coresight/coresight-replicator-qcom.c
> index 700f710..0a3d15f 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator-qcom.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator-qcom.c
> @@ -102,7 +102,7 @@ static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
>         struct resource *res = &adev->res;
>         struct coresight_platform_data *pdata = NULL;
>         struct replicator_state *drvdata;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = adev->dev.of_node;
>         void __iomem *base;
>
> @@ -134,16 +134,12 @@ static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
>         dev_set_drvdata(dev, drvdata);
>         pm_runtime_put(&adev->dev);
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc)
> -               return -ENOMEM;
> -
> -       desc->type = CORESIGHT_DEV_TYPE_LINK;
> -       desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
> -       desc->ops = &replicator_cs_ops;
> -       desc->pdata = adev->dev.platform_data;
> -       desc->dev = &adev->dev;
> -       drvdata->csdev = coresight_register(desc);
> +       desc.type = CORESIGHT_DEV_TYPE_LINK;
> +       desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
> +       desc.ops = &replicator_cs_ops;
> +       desc.pdata = adev->dev.platform_data;
> +       desc.dev = &adev->dev;
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev))
>                 return PTR_ERR(drvdata->csdev);
>
> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
> index c6982e3..3756e71 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
> @@ -69,7 +69,7 @@ static int replicator_probe(struct platform_device *pdev)
>         struct device *dev = &pdev->dev;
>         struct coresight_platform_data *pdata = NULL;
>         struct replicator_drvdata *drvdata;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = pdev->dev.of_node;
>
>         if (np) {
> @@ -95,18 +95,12 @@ static int replicator_probe(struct platform_device *pdev)
>         pm_runtime_enable(&pdev->dev);
>         platform_set_drvdata(pdev, drvdata);
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc) {
> -               ret = -ENOMEM;
> -               goto out_disable_pm;
> -       }
> -
> -       desc->type = CORESIGHT_DEV_TYPE_LINK;
> -       desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
> -       desc->ops = &replicator_cs_ops;
> -       desc->pdata = pdev->dev.platform_data;
> -       desc->dev = &pdev->dev;
> -       drvdata->csdev = coresight_register(desc);
> +       desc.type = CORESIGHT_DEV_TYPE_LINK;
> +       desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
> +       desc.ops = &replicator_cs_ops;
> +       desc.pdata = pdev->dev.platform_data;
> +       desc.dev = &pdev->dev;
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
>                 ret = PTR_ERR(drvdata->csdev);
>                 goto out_disable_pm;
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index 73be58a..c221de0 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -778,7 +778,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
>         struct resource *res = &adev->res;
>         struct resource ch_res;
>         size_t res_size, bitmap_size;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = adev->dev.of_node;
>
>         if (np) {
> @@ -843,19 +843,13 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
>                 return -EPROBE_DEFER;
>         }
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc) {
> -               ret = -ENOMEM;
> -               goto stm_unregister;
> -       }
> -
> -       desc->type = CORESIGHT_DEV_TYPE_SOURCE;
> -       desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE;
> -       desc->ops = &stm_cs_ops;
> -       desc->pdata = pdata;
> -       desc->dev = dev;
> -       desc->groups = coresight_stm_groups;
> -       drvdata->csdev = coresight_register(desc);
> +       desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> +       desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE;
> +       desc.ops = &stm_cs_ops;
> +       desc.pdata = pdata;
> +       desc.dev = dev;
> +       desc.groups = coresight_stm_groups;
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
>                 ret = PTR_ERR(drvdata->csdev);
>                 goto stm_unregister;
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index 84052c7..4cbcaf9 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -302,7 +302,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>         struct coresight_platform_data *pdata = NULL;
>         struct tmc_drvdata *drvdata;
>         struct resource *res = &adev->res;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = adev->dev.of_node;
>
>         if (np) {
> @@ -319,10 +319,6 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>         if (!drvdata)
>                 goto out;
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc)
> -               goto out;
> -
>         drvdata->dev = &adev->dev;
>         dev_set_drvdata(dev, drvdata);
>
> @@ -354,24 +350,25 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>
>         pm_runtime_put(&adev->dev);
>
> -       desc->pdata = pdata;
> -       desc->dev = dev;
> -       desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
> -       desc->groups = coresight_tmc_groups;
> +       desc.pdata = pdata;
> +       desc.dev = dev;
> +       desc.groups = coresight_tmc_groups;
>
>         if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
> -               desc->type = CORESIGHT_DEV_TYPE_SINK;
> -               desc->ops = &tmc_etb_cs_ops;
> +               desc.type = CORESIGHT_DEV_TYPE_SINK;
> +               desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
> +               desc.ops = &tmc_etb_cs_ops;
>         } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
> -               desc->type = CORESIGHT_DEV_TYPE_SINK;
> -               desc->ops = &tmc_etr_cs_ops;
> +               desc.type = CORESIGHT_DEV_TYPE_SINK;
> +               desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
> +               desc.ops = &tmc_etr_cs_ops;
>         } else {
> -               desc->type = CORESIGHT_DEV_TYPE_LINKSINK;
> -               desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
> -               desc->ops = &tmc_etf_cs_ops;
> +               desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
> +               desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
> +               desc.ops = &tmc_etf_cs_ops;
>         }
>
> -       drvdata->csdev = coresight_register(desc);
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
>                 ret = PTR_ERR(drvdata->csdev);
>                 goto out;
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index 4e471e2..0673baf 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -119,7 +119,7 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
>         struct coresight_platform_data *pdata = NULL;
>         struct tpiu_drvdata *drvdata;
>         struct resource *res = &adev->res;
> -       struct coresight_desc *desc;
> +       struct coresight_desc desc = { 0 };
>         struct device_node *np = adev->dev.of_node;
>
>         if (np) {
> @@ -154,16 +154,12 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
>
>         pm_runtime_put(&adev->dev);
>
> -       desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -       if (!desc)
> -               return -ENOMEM;
> -
> -       desc->type = CORESIGHT_DEV_TYPE_SINK;
> -       desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
> -       desc->ops = &tpiu_cs_ops;
> -       desc->pdata = pdata;
> -       desc->dev = dev;
> -       drvdata->csdev = coresight_register(desc);
> +       desc.type = CORESIGHT_DEV_TYPE_SINK;
> +       desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
> +       desc.ops = &tpiu_cs_ops;
> +       desc.pdata = pdata;
> +       desc.dev = dev;
> +       drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev))
>                 return PTR_ERR(drvdata->csdev);
>
> --
> 2.7.4
>

Applied - thanks

Mathieu



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