coresight: Update comments for removing cs_etm_find_snapshot()

Commit 2f01c200d440 ("perf cs-etm: Remove callback cs_etm_find_snapshot()")
has removed the function cs_etm_find_snapshot() from the perf tool in the
user space, now CoreSight trace directly uses the perf common function
__auxtrace_mmap__read() to calcualte the head and size for AUX trace data
in snapshot mode.

This patch updates the comments in drivers to make them generic and not
stick to any specific function from perf tool.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Link: https://lore.kernel.org/r/20210912125748.2816606-3-leo.yan@linaro.org
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index f775cbee12b88d7c65ac0c46d71a595fb7cda6d3..efa39820aceca2c142e64659b0bdaa6ceeffdd29 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -557,9 +557,8 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
 
        /*
         * In snapshot mode we simply increment the head by the number of byte
-        * that were written.  User space function  cs_etm_find_snapshot() will
-        * figure out how many bytes to get from the AUX buffer based on the
-        * position of the head.
+        * that were written.  User space will figure out how many bytes to get
+        * from the AUX buffer based on the position of the head.
         */
        if (buf->snapshot)
                handle->head += to_read;

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 8debd4f40f065ddd3a82d3ec1b83bf31fb31f175..4c4cbd1f72584233f2a84b1a1c985c09195e1359 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -546,9 +546,8 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
 
        /*
         * In snapshot mode we simply increment the head by the number of byte
-        * that were written.  User space function  cs_etm_find_snapshot() will
-        * figure out how many bytes to get from the AUX buffer based on the
-        * position of the head.
+        * that were written.  User space will figure out how many bytes to get
+        * from the AUX buffer based on the position of the head.
         */
        if (buf->snapshot)
                handle->head += to_read;

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 14a86a232a18102aa227d0c5a31e070e22c4c470..d6da38e7c682986f3c618cd620896ff0362b6bfb 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1556,9 +1556,8 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
 
        /*
         * In snapshot mode we simply increment the head by the number of byte
-        * that were written.  User space function  cs_etm_find_snapshot() will
-        * figure out how many bytes to get from the AUX buffer based on the
-        * position of the head.
+        * that were written.  User space will figure out how many bytes to get
+        * from the AUX buffer based on the position of the head.
         */
        if (etr_perf->snapshot)
                handle->head += size;