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Date: Mon, 13 May 2019 11:21:57 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Suzuki K Poulose <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
coresight@...ts.linaro.org, rjw@...ysocki.net
Subject: Re: [PATCH v3 22/30] coresight: Rearrange platform data probing
On Tue, May 07, 2019 at 11:52:49AM +0100, Suzuki K Poulose wrote:
> We are about to introduce methods to clean up the platform data
> as we switch to tracking the device reference from "name" to "fwnode
> handles" for device connections. This requires us to drop the fwnode
> handle references when the data is no longer required - i.e, when
> the device probe fails or the device gets unregistered.
>
> In order to consolidate the invocation of the cleanup, we delay the
> platform probing to the very last minute, possibly before invoking
> the coresight_register. Then, we leave the coresight core code to
> do the clean up. i.e, if the coresight_register fails, it takes
> care of freeing the data. Otherwise, coresight_unregister will
> do the necessary operations.
>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
> drivers/hwtracing/coresight/coresight-catu.c | 14 +++++++-------
> drivers/hwtracing/coresight/coresight-etb10.c | 10 +++++-----
> drivers/hwtracing/coresight/coresight-etm3x.c | 12 +++++++-----
> drivers/hwtracing/coresight/coresight-etm4x.c | 12 +++++++-----
> drivers/hwtracing/coresight/coresight-funnel.c | 12 +++++++-----
> drivers/hwtracing/coresight/coresight-replicator.c | 12 +++++++-----
> drivers/hwtracing/coresight/coresight-stm.c | 11 +++++++----
> drivers/hwtracing/coresight/coresight-tmc.c | 16 ++++++++--------
> drivers/hwtracing/coresight/coresight-tpiu.c | 10 +++++-----
> 9 files changed, 60 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
> index 05c7304..1c1ad12 100644
> --- a/drivers/hwtracing/coresight/coresight-catu.c
> +++ b/drivers/hwtracing/coresight/coresight-catu.c
> @@ -505,13 +505,6 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
> struct device *dev = &adev->dev;
> void __iomem *base;
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata)) {
> - ret = PTR_ERR(pdata);
> - goto out;
> - }
> - dev->platform_data = pdata;
> -
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> if (!drvdata) {
> ret = -ENOMEM;
> @@ -544,6 +537,13 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
> if (ret)
> goto out;
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + goto out;
> + }
> + dev->platform_data = pdata;
> +
> drvdata->base = base;
> catu_desc.pdata = pdata;
> catu_desc.dev = dev;
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index 5e7ecc6..09df827 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -726,11 +726,6 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
> struct resource *res = &adev->res;
> struct coresight_desc desc = { 0 };
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata))
> - return PTR_ERR(pdata);
> - adev->dev.platform_data = pdata;
> -
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> if (!drvdata)
> return -ENOMEM;
> @@ -765,6 +760,11 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
> /* This device is not associated with a session */
> drvdata->pid = -1;
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata))
> + return PTR_ERR(pdata);
> + adev->dev.platform_data = pdata;
> +
> desc.type = CORESIGHT_DEV_TYPE_SINK;
> desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
> desc.ops = &etb_cs_ops;
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
> index 101fb01..f2d4616 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
> @@ -795,11 +795,6 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
> if (!drvdata)
> return -ENOMEM;
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata))
> - return PTR_ERR(pdata);
> -
> - adev->dev.platform_data = pdata;
> drvdata->use_cp14 = fwnode_property_read_bool(dev->fwnode, "arm,cp14");
> dev_set_drvdata(dev, drvdata);
>
> @@ -849,6 +844,13 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
> etm_init_trace_id(drvdata);
> etm_set_default(&drvdata->config);
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + goto err_arch_supported;
> + }
> + adev->dev.platform_data = pdata;
> +
> desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
> desc.ops = &etm_cs_ops;
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 8adc148..1609da1 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -1089,11 +1089,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> if (!drvdata)
> return -ENOMEM;
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata))
> - return PTR_ERR(pdata);
> - adev->dev.platform_data = pdata;
> -
> dev_set_drvdata(dev, drvdata);
>
> /* Validity for the resource is already checked by the AMBA core */
> @@ -1136,6 +1131,13 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> etm4_init_trace_id(drvdata);
> etm4_set_default(&drvdata->config);
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + goto err_arch_supported;
> + }
> + adev->dev.platform_data = pdata;
> +
> desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
> desc.ops = &etm4_cs_ops;
> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
> index ded33f5..75fa2d3 100644
> --- a/drivers/hwtracing/coresight/coresight-funnel.c
> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
> @@ -188,11 +188,6 @@ static int funnel_probe(struct device *dev, struct resource *res)
> struct funnel_drvdata *drvdata;
> struct coresight_desc desc = { 0 };
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata))
> - return PTR_ERR(pdata);
> - dev->platform_data = pdata;
> -
> if (is_of_node(dev_fwnode(dev)) &&
> of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
> pr_warn_once("Uses OBSOLETE CoreSight funnel binding\n");
> @@ -224,6 +219,13 @@ static int funnel_probe(struct device *dev, struct resource *res)
>
> dev_set_drvdata(dev, drvdata);
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + goto out_disable_clk;
> + }
> + dev->platform_data = pdata;
> +
> desc.type = CORESIGHT_DEV_TYPE_LINK;
> desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
> desc.ops = &funnel_cs_ops;
> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
> index f28bafd..64dfde7 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
> @@ -179,11 +179,6 @@ static int replicator_probe(struct device *dev, struct resource *res)
> struct coresight_desc desc = { 0 };
> void __iomem *base;
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata))
> - return PTR_ERR(pdata);
> - dev->platform_data = pdata;
> -
> if (is_of_node(dev_fwnode(dev)) &&
> of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
> pr_warn_once("Uses OBSOLETE CoreSight replicator binding\n");
> @@ -215,6 +210,13 @@ static int replicator_probe(struct device *dev, struct resource *res)
>
> dev_set_drvdata(dev, drvdata);
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + goto out_disable_clk;
> + }
> + dev->platform_data = pdata;
> +
> desc.type = CORESIGHT_DEV_TYPE_LINK;
> desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
> desc.ops = &replicator_cs_ops;
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index 02031d9..03528f3 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -810,10 +810,6 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
> size_t bitmap_size;
> struct coresight_desc desc = { 0 };
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata))
> - return PTR_ERR(pdata);
> - adev->dev.platform_data = pdata;
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> if (!drvdata)
> return -ENOMEM;
> @@ -866,6 +862,13 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
> return -EPROBE_DEFER;
> }
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + goto stm_unregister;
> + }
> + adev->dev.platform_data = pdata;
> +
> desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE;
> desc.ops = &stm_cs_ops;
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index 44a5719..212630e 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -398,13 +398,6 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
> struct resource *res = &adev->res;
> struct coresight_desc desc = { 0 };
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata)) {
> - ret = PTR_ERR(pdata);
> - goto out;
> - }
> - adev->dev.platform_data = pdata;
> -
> ret = -ENOMEM;
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> if (!drvdata)
> @@ -434,7 +427,6 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
> else
> drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
>
> - desc.pdata = pdata;
> desc.dev = dev;
> desc.groups = coresight_tmc_groups;
> desc.name = dev_name(dev);
> @@ -467,6 +459,14 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
> goto out;
> }
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + goto out;
> + }
> + adev->dev.platform_data = pdata;
> + desc.pdata = pdata;
> +
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev)) {
> ret = PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index d8a2e39..b699d61 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -125,11 +125,6 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
> struct resource *res = &adev->res;
> struct coresight_desc desc = { 0 };
>
> - pdata = coresight_get_platform_data(dev);
> - if (IS_ERR(pdata))
> - return PTR_ERR(pdata);
> - dev->platform_data = pdata;
> -
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> if (!drvdata)
> return -ENOMEM;
> @@ -152,6 +147,11 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
> /* Disable tpiu to support older devices */
> tpiu_disable_hw(drvdata);
>
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata))
> + return PTR_ERR(pdata);
> + dev->platform_data = pdata;
> +
> desc.type = CORESIGHT_DEV_TYPE_SINK;
> desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
> desc.ops = &tpiu_cs_ops;
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> --
> 2.7.4
>
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