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author | Mao Jinlong <quic_jinlmao@quicinc.com> | 2023-01-17 06:57:00 -0800 |
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committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2023-01-19 15:44:47 +0000 |
commit | 5c0016d7b343e453e38752ca58bc18394ece310a (patch) | |
tree | 0cffa84b7d747193a1118b8d13047f9e67478d02 /drivers/hwtracing | |
parent | fd30b085deebe73d78e4321f88a7f95ba1db86a9 (diff) | |
download | linux-stable-5c0016d7b343e453e38752ca58bc18394ece310a.tar.gz linux-stable-5c0016d7b343e453e38752ca58bc18394ece310a.tar.bz2 linux-stable-5c0016d7b343e453e38752ca58bc18394ece310a.zip |
coresight: core: Use IDR for non-cpu bound sources' paths.
Except stm, there could be other sources which are not associated
with cpus. Use IDR to store and search these sources' paths.
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230117145708.16739-2-quic_jinlmao@quicinc.com
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-core.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index ce3aa845ecc2..5eb013f49a0d 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -8,6 +8,7 @@ #include <linux/types.h> #include <linux/device.h> #include <linux/io.h> +#include <linux/idr.h> #include <linux/err.h> #include <linux/export.h> #include <linux/slab.h> @@ -26,6 +27,13 @@ static DEFINE_MUTEX(coresight_mutex); static DEFINE_PER_CPU(struct coresight_device *, csdev_sink); +/* + * Use IDR to map the hash of the source's device name + * to the pointer of path for the source. The idr is for + * the sources which aren't associated with CPU. + */ +static DEFINE_IDR(path_idr); + /** * struct coresight_node - elements of a path, from source to sink * @csdev: Address of an element. @@ -43,14 +51,6 @@ struct coresight_node { static DEFINE_PER_CPU(struct list_head *, tracer_path); /* - * As of this writing only a single STM can be found in CS topologies. Since - * there is no way to know if we'll ever see more and what kind of - * configuration they will enact, for the time being only define a single path - * for STM. - */ -static struct list_head *stm_path; - -/* * When losing synchronisation a new barrier packet needs to be inserted at the * beginning of the data collected in a buffer. That way the decoder knows that * it needs to look for another sync sequence. @@ -1075,6 +1075,7 @@ int coresight_enable(struct coresight_device *csdev) struct coresight_device *sink; struct list_head *path; enum coresight_dev_subtype_source subtype; + u32 hash; subtype = csdev->subtype.source_subtype; @@ -1129,7 +1130,14 @@ int coresight_enable(struct coresight_device *csdev) per_cpu(tracer_path, cpu) = path; break; case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE: - stm_path = path; + /* + * Use the hash of source's device name as ID + * and map the ID to the pointer of the path. + */ + hash = hashlen_hash(hashlen_string(NULL, dev_name(&csdev->dev))); + ret = idr_alloc_u32(&path_idr, path, &hash, hash, GFP_KERNEL); + if (ret) + goto err_source; break; default: /* We can't be here */ @@ -1153,6 +1161,7 @@ void coresight_disable(struct coresight_device *csdev) { int cpu, ret; struct list_head *path = NULL; + u32 hash; mutex_lock(&coresight_mutex); @@ -1170,14 +1179,20 @@ void coresight_disable(struct coresight_device *csdev) per_cpu(tracer_path, cpu) = NULL; break; case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE: - path = stm_path; - stm_path = NULL; + hash = hashlen_hash(hashlen_string(NULL, dev_name(&csdev->dev))); + /* Find the path by the hash. */ + path = idr_find(&path_idr, hash); + if (path == NULL) { + pr_err("Path is not found for %s\n", dev_name(&csdev->dev)); + goto out; + } break; default: /* We can't be here */ break; } + idr_remove(&path_idr, hash); coresight_disable_path(path); coresight_release_path(path); |