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Message-ID: <c25f0d12-e820-58b0-b139-b2ca322b6b80@arm.com>
Date: Mon, 3 Apr 2023 09:46:29 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: James Clark <james.clark@....com>, coresight@...ts.linaro.org,
quic_jinlmao@...cinc.com, mike.leach@...aro.org
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
Leo Yan <leo.yan@...aro.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH v3 07/13] coresight: Store pointers to connections rather
than an array of them
On 29/03/2023 12:53, James Clark wrote:
> This will allow the same connection object to be referenced via the
> input connection list in a later commit rather than duplicating them.
>
> Signed-off-by: James Clark <james.clark@....com>
> ---
> drivers/hwtracing/coresight/coresight-core.c | 45 ++++++++++---------
> .../hwtracing/coresight/coresight-platform.c | 8 ++--
> drivers/hwtracing/coresight/coresight-priv.h | 1 +
> .../hwtracing/coresight/coresight-tmc-etr.c | 2 +-
> include/linux/coresight.h | 2 +-
> 5 files changed, 31 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
> index 12cbb68e8e1c..389f6203c8f0 100644
> --- a/drivers/hwtracing/coresight/coresight-core.c
> +++ b/drivers/hwtracing/coresight/coresight-core.c
> @@ -119,7 +119,7 @@ static int coresight_find_link_inport(struct coresight_device *csdev,
> struct coresight_connection *conn;
>
> for (i = 0; i < parent->pdata->nr_outconns; i++) {
> - conn = &parent->pdata->out_conns[i];
> + conn = parent->pdata->out_conns[i];
> if (conn->dest_dev == csdev)
> return conn->dest_port;
> }
> @@ -137,7 +137,7 @@ static int coresight_find_link_outport(struct coresight_device *csdev,
> struct coresight_connection *conn;
>
> for (i = 0; i < csdev->pdata->nr_outconns; i++) {
> - conn = &csdev->pdata->out_conns[i];
> + conn = csdev->pdata->out_conns[i];
> if (conn->dest_dev == child)
> return conn->src_port;
> }
> @@ -606,7 +606,7 @@ coresight_find_enabled_sink(struct coresight_device *csdev)
> for (i = 0; i < csdev->pdata->nr_outconns; i++) {
> struct coresight_device *child_dev;
>
> - child_dev = csdev->pdata->out_conns[i].dest_dev;
> + child_dev = csdev->pdata->out_conns[i]->dest_dev;
> if (child_dev)
> sink = coresight_find_enabled_sink(child_dev);
> if (sink)
> @@ -722,7 +722,7 @@ static int coresight_grab_device(struct coresight_device *csdev)
> for (i = 0; i < csdev->pdata->nr_outconns; i++) {
> struct coresight_device *child;
>
> - child = csdev->pdata->out_conns[i].dest_dev;
> + child = csdev->pdata->out_conns[i]->dest_dev;
> if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
> if (!coresight_get_ref(child))
> goto err;
> @@ -733,7 +733,7 @@ static int coresight_grab_device(struct coresight_device *csdev)
> for (i--; i >= 0; i--) {
> struct coresight_device *child;
>
> - child = csdev->pdata->out_conns[i].dest_dev;
> + child = csdev->pdata->out_conns[i]->dest_dev;
> if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
> coresight_put_ref(child);
> }
> @@ -752,7 +752,7 @@ static void coresight_drop_device(struct coresight_device *csdev)
> for (i = 0; i < csdev->pdata->nr_outconns; i++) {
> struct coresight_device *child;
>
> - child = csdev->pdata->out_conns[i].dest_dev;
> + child = csdev->pdata->out_conns[i]->dest_dev;
> if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
> coresight_put_ref(child);
> }
> @@ -794,7 +794,7 @@ static int _coresight_build_path(struct coresight_device *csdev,
> for (i = 0; i < csdev->pdata->nr_outconns; i++) {
> struct coresight_device *child_dev;
>
> - child_dev = csdev->pdata->out_conns[i].dest_dev;
> + child_dev = csdev->pdata->out_conns[i]->dest_dev;
> if (child_dev &&
> _coresight_build_path(child_dev, sink, path) == 0) {
> found = true;
> @@ -964,7 +964,7 @@ coresight_find_sink(struct coresight_device *csdev, int *depth)
> struct coresight_device *child_dev, *sink = NULL;
> int child_depth = curr_depth;
>
> - child_dev = csdev->pdata->out_conns[i].dest_dev;
> + child_dev = csdev->pdata->out_conns[i]->dest_dev;
> if (child_dev)
> sink = coresight_find_sink(child_dev, &child_depth);
>
> @@ -1334,7 +1334,7 @@ static int coresight_orphan_match(struct device *dev, void *data)
> * an orphan connection whose name matches @csdev, link it.
> */
> for (i = 0; i < i_csdev->pdata->nr_outconns; i++) {
> - conn = &i_csdev->pdata->out_conns[i];
> + conn = i_csdev->pdata->out_conns[i];
>
> /* We have found at least one orphan connection */
> if (conn->dest_dev == NULL) {
> @@ -1372,7 +1372,7 @@ static int coresight_fixup_device_conns(struct coresight_device *csdev)
> int i, ret = 0;
>
> for (i = 0; i < csdev->pdata->nr_outconns; i++) {
> - struct coresight_connection *conn = &csdev->pdata->out_conns[i];
> + struct coresight_connection *conn = csdev->pdata->out_conns[i];
>
> conn->dest_dev =
> coresight_find_csdev_by_fwnode(conn->dest_fwnode);
> @@ -1406,15 +1406,12 @@ static int coresight_remove_match(struct device *dev, void *data)
> * a connection whose name matches @csdev, remove it.
> */
> for (i = 0; i < iterator->pdata->nr_outconns; i++) {
> - conn = &iterator->pdata->out_conns[i];
> + conn = iterator->pdata->out_conns[i];
>
> - if (conn->dest_dev == NULL)
> - continue;
> -
> - if (csdev->dev.fwnode == conn->dest_fwnode) {
> + /* Child_dev being set signifies that the links were made */
> + if (csdev->dev.fwnode == conn->dest_fwnode && conn->dest_dev) {
> iterator->orphan = true;
> coresight_remove_links(iterator, conn);
> -
> conn->dest_dev = NULL;
> /* No need to continue */
> break;
> @@ -1534,21 +1531,25 @@ void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
> * to the output port of this device.
> */
> void coresight_release_platform_data(struct coresight_device *csdev,
> + struct device *dev,
> struct coresight_platform_data *pdata)
> {
> int i;
> - struct coresight_connection *conns = pdata->out_conns;
> + struct coresight_connection **conns = pdata->out_conns;
>
> for (i = 0; i < pdata->nr_outconns; i++) {
> /* If we have made the links, remove them now */
> - if (csdev && conns[i].dest_dev)
> - coresight_remove_links(csdev, &conns[i]);
> + if (csdev && conns[i]->dest_dev)
> + coresight_remove_links(csdev, conns[i]);
> /*
> * Drop the refcount and clear the handle as this device
> * is going away
> */
> - fwnode_handle_put(conns[i].dest_fwnode);
> + fwnode_handle_put(conns[i]->dest_fwnode);
> + devm_kfree(dev, conns[i]);
> }
> + devm_kfree(dev, pdata->out_conns);
> + devm_kfree(dev, pdata);
Is there any particular reason, why we need to do this ? This should
be done automatically at device teardown, which is bound to happen
right after this call ?
> if (csdev)
> coresight_remove_conns_sysfs_group(csdev);
> }
> @@ -1665,7 +1666,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
>
> err_out:
> /* Cleanup the connection information */
> - coresight_release_platform_data(NULL, desc->pdata);
> + coresight_release_platform_data(NULL, desc->dev, desc->pdata);
> return ERR_PTR(ret);
> }
> EXPORT_SYMBOL_GPL(coresight_register);
> @@ -1678,7 +1679,7 @@ void coresight_unregister(struct coresight_device *csdev)
> cti_assoc_ops->remove(csdev);
> coresight_remove_conns(csdev);
> coresight_clear_default_sink(csdev);
> - coresight_release_platform_data(csdev, csdev->pdata);
> + coresight_release_platform_data(csdev, csdev->dev.parent, csdev->pdata);
> device_unregister(&csdev->dev);
> }
> EXPORT_SYMBOL_GPL(coresight_unregister);
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index 80ed2e74620b..bea8f1ba309a 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -36,7 +36,7 @@ int coresight_add_out_conn(struct device *dev,
> * Warn on any existing duplicate output port.
> */
> for (i = 0; i < pdata->nr_outconns; ++i) {
> - conn = &pdata->out_conns[i];
> + conn = pdata->out_conns[i];
> /* Output == -1 means ignore the port for example for helpers */
> if (conn->src_port != -1 &&
> conn->src_port == new_conn->src_port) {
> @@ -53,7 +53,9 @@ int coresight_add_out_conn(struct device *dev,
> if (!pdata->out_conns)
> return -ENOMEM;
>
> - pdata->out_conns[pdata->nr_outconns - 1] = *new_conn;
> + pdata->out_conns[pdata->nr_outconns - 1] = devm_kmalloc(
> + dev, sizeof(struct coresight_connection), GFP_KERNEL);
> + *pdata->out_conns[pdata->nr_outconns - 1] = *new_conn;
> return 0;
> }
> EXPORT_SYMBOL_GPL(coresight_add_out_conn);
> @@ -859,7 +861,7 @@ coresight_get_platform_data(struct device *dev)
> error:
> if (!IS_ERR_OR_NULL(pdata))
> /* Cleanup the connection information */
> - coresight_release_platform_data(NULL, pdata);
> + coresight_release_platform_data(NULL, dev, pdata);
> return ERR_PTR(ret);
> }
> EXPORT_SYMBOL_GPL(coresight_get_platform_data);
> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index 788ff19c60f6..65ae6d161c57 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h
> @@ -207,6 +207,7 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
> }
>
> void coresight_release_platform_data(struct coresight_device *csdev,
> + struct device *dev,
> struct coresight_platform_data *pdata);
> struct coresight_device *
> coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode);
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> index 61234cb8052a..1bbe5410a23d 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> @@ -782,7 +782,7 @@ tmc_etr_get_catu_device(struct tmc_drvdata *drvdata)
> return NULL;
>
> for (i = 0; i < etr->pdata->nr_outconns; i++) {
> - tmp = etr->pdata->out_conns[i].dest_dev;
> + tmp = etr->pdata->out_conns[i]->dest_dev;
> if (tmp && coresight_is_catu_device(tmp))
> return tmp;
> }
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index ccbc5eafcb6b..7197b07deede 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -111,7 +111,7 @@ struct coresight_platform_data {
> int high_outport;
> int nr_inconns;
> int nr_outconns;
> - struct coresight_connection *out_conns;
> + struct coresight_connection **out_conns;
minor nit: Do we need to update the comment too ?
Otherwise looks good to me
Suzuki
> };
>
> /**
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